Merge pull request 'v1.1.0' (#16) from dev into main

Reviewed-on: #16

.gitignore

@@ -6,3 +6,4 @@ test/
 .codex
 .agents/
 .claude/
+review.md

.golangci.yml

@@ -2,7 +2,7 @@ version: "2"
 run:
   timeout: 5m
 linters:
-  disable-all: true
+  default: none
   enable:
     - errcheck
     - ineffassign

AGENTS.md

@@ -60,6 +60,11 @@ Each exported godoc comment must:
 - avoid repeating the signature mechanically;
 - stay high-signal and informative.
 
+### Telegram API documentation and versions
+- When writing or updating godoc for Telegram Bot API types, fields, methods, or helpers, verify the description against the official [Telegram Bot API documentation](https://core.telegram.org/bots/api). Preserve relevant API semantics such as HTML equivalents, accepted ranges, formats, and optionality.
+- Add a `Since: Bot API X.Y` paragraph to each exported type, function, and method introduced in a specific Bot API version, using the established `tgapi` format.
+- Add an inline `// Since: Bot API X.Y` comment to an exported struct field only when its Bot API version differs from that of the containing struct. For example, if `InputRichMessage` was introduced in Bot API 10.1 and its `Media` field in Bot API 10.2, annotate only the `Media` field; do not repeat the struct's version on its original fields.
+
 ### Unexported declarations
 Unexported types, funcs, methods, vars, and consts should generally not have godoc-style comments unless there is a strong reason.
 
@@ -115,8 +120,8 @@ Prefer the repository’s documented commands. If multiple choices exist, use th
 
 ## Breaking changes policy
 - The agent must detect potential breaking changes before editing public APIs.
-- Breaking changes are forbidden unless the selected target version is a new major version.
-- If the requested change is breaking and the user did not bump the major version, the agent must stop and warn that the change is not allowed under the current version.
+- Breaking changes are forbidden unless the selected target version is a new major version, or it's necessary(i.e. fixing not working feature).
+- If the requested change is breaking, not necessary to fix a non-working feature, and the user did not bump the major version, the agent must stop and warn that the change is not allowed under the current version.
 - In that case, the agent must offer only these options:
   1. do not make the breaking change;
   2. introduce a backward-compatible alternative such as a new method, function, type, or struct, but only if that keeps the codebase reasonably small and clear;

CHANGELOG.md

@@ -1,5 +1,73 @@
 # Changelog
 
+## v1.1.0
+
+### Breaking Changes
+- Fixed `Uploader.SendLivePhoto` and `Uploader.SendLivePhotoWithContext` to require both the live-photo video and its static image. The previous one-file signatures could not produce a valid `sendLivePhoto` request.
+
+### Bot API 10.1
+- Added rich message receiving support: `tgapi.RichMessage` on `Message.RichMessage` (`rich_message`), the full set of `RichText*`/`RichBlock*` wire types with official API names, and `UnmarshalRichText`/`UnmarshalRichBlock`/`UnmarshalRichMessage` parsers. Unknown text-bearing types retain their nested text through fallback wrappers while unmodeled fields are discarded.
+- Added rich message sending support: `tgapi.InputRichMessage`, `tgapi.SendRichMessage` params, and `API.SendRichMessage`/`API.SendRichMessageWithContext`.
+- Added rich message draft streaming: `API.SendRichMessageDraft`/`API.SendRichMessageDraftWithContext` for ephemeral ~30-second previews of partially generated messages.
+- Added rich message editing: `EditMessageText.RichMessage` (`InputRichMessage`); `Text` is now omitted from the request when empty so rich-only edits are valid.
+- Added `tgapi.InputRichMessageContent` for rich content in inline query results.
+- Added join request query support: `User.SupportsJoinRequestQueries`, `ChatFullInfo.GuardBot`, `ChatJoinRequest.QueryID`, `API.AnswerChatJoinRequestQuery` with `ChatJoinRequestQueryResult` constants (`JoinRequestApprove`/`JoinRequestDecline`/`JoinRequestQueue`), and `API.SendChatJoinRequestWebApp` (plus `WithContext` variants).
+- Added poll link media: the `tgapi.Link` type, `PollMedia.Link`, and the "link" type with `URL` on `InputPollOptionMedia`.
+
+### Bot API 10.2
+- Added block-based rich-message sending with `InputRichMessage.Blocks`, including animation, audio, photo, video, and voice-note input blocks. The `tgrich` package provides matching media constructors with optional block captions.
+- Added `InputRichMessage.Media` for media embedded in rich-message HTML or Markdown, with multipart `attach://` upload support.
+- Added multipart rich-message uploads through `Uploader.SendRichMessage`. Use `UploaderFile.SetAttachName` to match an `attach://` media reference; rich-message draft helpers reject direct uploads as required by Telegram.
+- Added ephemeral-message support: outgoing receiver and callback parameters, reply targets, message fields, edit and delete methods, and ephemeral bot commands. Added community service-message types and subscription update handling.
+
+### Added
+- Added documented `tgrich` constructors and block types for building input rich messages.
+- Added `tgrich.BuildHTML` and `tgrich.ToHTML` to validate input block trees, convert them to HTML rich messages, and collect URL, `file_id`, or multipart media references.
+- Added `MessageContext.RichAnswer(...)` and `MessageContext.RichAnswerKeyboard(...)` for validating and sending `tgrich` input blocks.
+- Added `UpdateTypeSubscription` routing and normalized message, user, and chat context for guest messages, deleted business messages, anonymous poll answers, reaction counts, managed bots, chat boosts, and subscription updates.
+- Added webhook secret-format validation and the exported `ErrBotWebhookOptsSecretTokenInvalid` sentinel.
+
+### Changed
+- `AutoGenerateCommandsForScope(nil)` now atomically replaces commands in Telegram's default scope without deleting the previous list first.
+- API debug logging now records redacted request JSON and response metadata instead of complete response bodies.
+- Scene updates sharing a user or chat session key are serialized, and duplicate scene names from later plugins are skipped with a warning.
+- Inline keyboard button builders now keep URL and callback actions mutually exclusive, and `InlineKeyboard.Get` returns independent markup data.
+- `NewBot` no longer aliases `BotOpts.Prefixes` or mutates `BotOpts.LoggerBasePath`.
+- README requirements now match the module's Go 1.26 directive.
+- Migrated the golangci-lint configuration to its v2 schema so the repository lint workflow runs again.
+- Added missing Godoc for exported error methods, enum constants, and all public Bot API 10.1/10.2 fields introduced in this release.
+
+### Fixed
+- Fixed JSON BotOpts environment placeholders corrupting or injecting JSON when values contain quotes, backslashes, or control characters.
+- Preserved checkbox state when converting list items to ordered lists and made generated HTML attribute ordering deterministic.
+- Added validation for rich-block type discriminators, heading sizes, list fields, table cells, map parameters, and media values.
+- Fixed generated webhook secrets using padded Base64 characters that Telegram rejects, stopped logging generated secrets, and added HTTP read and idle timeouts to the webhook server.
+- Fixed negative group and channel IDs receiving global rather than per-chat `retry_after` cooldowns.
+- Fixed rejected per-chat requests consuming global rate-limit capacity and draft construction consuming an extra rate-limit token before the API request.
+- Fixed subscription updates being decoded as `UpdateTypeUnknown`.
+- Fixed rich-text and rich-block decoding silently accepting malformed typed fields or a top-level `null` rich-text value.
+- Fixed `tgrich.BuildHTML` disabling Telegram entity detection and accepting the draft-only thinking block; `BuildDraftHTML` now provides the explicit draft path.
+- Fixed `tgrich.BuildHTML` silently losing explicit bank-card, mention, hashtag, cashtag, and bot-command values when their visible text differs.
+- Fixed API debug logs exposing webhook, payment, callback, passport, and managed-bot secrets.
+- Fixed panics and nil callbacks in asynchronous middleware terminating the process; failures now reach the logger and observer error stream.
+- Fixed multipart helpers attempting direct file uploads for rich-message drafts, which Telegram does not support; they now return `ErrRichMessageDraftUploadUnsupported`.
+- Fixed draft ID zero values and collisions overwriting tracked drafts, nil draft APIs panicking, and draft entity slices aliasing caller memory.
+- Fixed scene session payloads and returned inline keyboard markup aliasing mutable internal slices.
+- Recovered panics from runner callbacks so they are reported through normal runner and error observer events instead of terminating the process.
+
+### Tests
+- Added JSON regression coverage for rich-message embedded media and ephemeral send, edit, and delete parameters.
+- Added regression coverage for escaped environment placeholders and both required `sendLivePhoto` multipart fields.
+- Added regression coverage for API log redaction, same-session scene serialization, duplicate scene registration, async middleware failures, and rich entity preservation.
+- Added rich HTML renderer coverage for all input block and media types, multipart references, field validation, and Telegram's text, block, nesting, media, and table-width limits.
+- Added regression coverage for webhook token syntax, update context normalization, subscription routing, rate-limit capacity, draft ID collisions, runner panics, scene and keyboard aliasing, command replacement, and malformed rich JSON.
+
+## v1.0.2
+
+### Fixed
+- Fixed long-polling stopping permanently when the HTTP client's internal timeout fired. The polling loop was checking `errors.Is(err, context.DeadlineExceeded)`, which matched HTTP client timeout errors (`*url.Error` wraps `context.DeadlineExceeded`), causing the goroutine to exit as if the bot context was canceled. The check is now `ctx.Err() != nil` so only a real context cancellation stops polling.
+- Fixed the HTTP client timeout (45 s) being too close to the long-poll `getUpdates` timeout (30 s default), leaving insufficient margin for connection setup and response transfer. The client timeout is now derived from the configured `PollTimeout` plus a 60-second buffer.
+
 ## v1.0.1
 
 ### Fixed

README.md

@@ -2,7 +2,7 @@
 
 ![Laniakea](assets/logo.jpg)
 
-[![Go Version](https://img.shields.io/badge/Go-1.24+-00ADD8?logo=go&style=flat-square)](https://go.dev/)
+[![Go Version](https://img.shields.io/badge/Go-1.26+-00ADD8?logo=go&style=flat-square)](https://go.dev/)
 [![License: GPL-3.0](https://img.shields.io/badge/License-GPL%203.0-blue.svg?style=flat-square)](LICENSE)
 ![Gitea Release](https://img.shields.io/gitea/v/release/ScuroNeko/Laniakea?gitea_url=https%3A%2F%2Fgit.scuroneko.dev&sort=semver&display_name=release&style=flat-square&color=purple&link=https%3A%2F%2Fgit.scuroneko.dev%2FScuroNeko%2FLaniakea%2Freleases)
 

README_RU.md

@@ -2,7 +2,7 @@
 
 ![Laniakea](assets/logo.jpg)
 
-[![Go Version](https://img.shields.io/badge/Go-1.24+-00ADD8?logo=go&style=flat-square)](https://go.dev/)
+[![Go Version](https://img.shields.io/badge/Go-1.26+-00ADD8?logo=go&style=flat-square)](https://go.dev/)
 [![License: GPL-3.0](https://img.shields.io/badge/License-GPL%203.0-blue.svg?style=flat-square)](LICENSE)
 ![Gitea Release](https://img.shields.io/gitea/v/release/ScuroNeko/Laniakea?gitea_url=https%3A%2F%2Fgit.scuroneko.dev&sort=semver&display_name=release&style=flat-square&color=purple&link=https%3A%2F%2Fgit.scuroneko.dev%2FScuroNeko%2FLaniakea%2Freleases)
 

bot.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"net/http"
 	"sync"
 	"time"
 
@@ -121,6 +122,7 @@ type Bot[T AppData] struct {
 
 	sessionStore       SessionStore // Session store for scene management
 	sceneScopePriority []SceneScope
+	sceneLocks         sceneKeyLocker
 
 	updateOffsetMu sync.Mutex
 	updateOffset   int                // Last processed update ID
@@ -166,21 +168,6 @@ func NewBot[T any](opts *BotOpts) (*Bot[T], error) {
 	limiter := utils.NewRateLimiter()
 	limiter.SetGlobalRate(opts.RateLimit)
 
-	apiOpts := tgapi.NewAPIOpts(opts.Token).
-		SetAPIURL(opts.APIURL).
-		UseTestServer(opts.UseTestServer).
-		SetLimiter(limiter).
-		SetDropRateLimitOverflow(opts.DropRateLimitOverflow).
-		SetLogFormat(opts.LogFormat).
-		SetLogFormatter(opts.LogFormatter)
-	api := tgapi.NewAPI(apiOpts)
-	uploader := tgapi.NewUploader(api)
-
-	prefixes := opts.Prefixes
-	if len(prefixes) == 0 {
-		prefixes = []string{"/"}
-	}
-
 	workers := 32
 	if opts.MaxWorkers > 0 {
 		workers = opts.MaxWorkers
@@ -191,6 +178,25 @@ func NewBot[T any](opts *BotOpts) (*Bot[T], error) {
 		pollTimeout = opts.PollTimeout
 	}
 
+	// HTTP client timeout must exceed pollTimeout to avoid spurious deadline
+	// errors that the polling loop would misinterpret as context cancellation.
+	httpTimeout := time.Duration(pollTimeout)*time.Second + 60*time.Second
+	apiOpts := tgapi.NewAPIOpts(opts.Token).
+		SetAPIURL(opts.APIURL).
+		UseTestServer(opts.UseTestServer).
+		SetLimiter(limiter).
+		SetDropRateLimitOverflow(opts.DropRateLimitOverflow).
+		SetLogFormat(opts.LogFormat).
+		SetLogFormatter(opts.LogFormatter).
+		SetHTTPClient(&http.Client{Timeout: httpTimeout})
+	api := tgapi.NewAPI(apiOpts)
+	uploader := tgapi.NewUploader(api)
+
+	prefixes := append([]string(nil), opts.Prefixes...)
+	if len(prefixes) == 0 {
+		prefixes = []string{"/"}
+	}
+
 	bot := &Bot[T]{
 		updateOffset:      0,
 		errorTemplate:     "%s",
@@ -225,10 +231,11 @@ func NewBot[T any](opts *BotOpts) (*Bot[T], error) {
 	if len(opts.ErrorTemplate) > 0 {
 		bot.errorTemplate = opts.ErrorTemplate
 	}
-	if len(opts.LoggerBasePath) == 0 {
-		opts.LoggerBasePath = "./"
+	loggerOpts := *opts
+	if len(loggerOpts.LoggerBasePath) == 0 {
+		loggerOpts.LoggerBasePath = "./"
 	}
-	bot.initLoggers(opts)
+	bot.initLoggers(&loggerOpts)
 
 	if opts.FileConfigVersion > 0 && opts.FileConfigVersion < ConfigVersion {
 		bot.logger.Warnln(
@@ -472,7 +479,7 @@ func (bot *Bot[T]) RunWithContext(ctx context.Context) error {
 			default:
 				updates, err := bot.Updates(ctx)
 				if err != nil {
-					if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
+					if ctx.Err() != nil {
 						return
 					}
 					retryDelay, ok := pollRetryAfterDelay(err)

bot_opts_loader.go

@@ -127,8 +127,18 @@ func (codec BotOptsFileJSONCodec) Save(filename string, opts *BotOpts) error {
 	return SaveBotOptsFile(codec, filename, opts)
 }
 
+// EscapeEnv escapes an environment value for use inside a JSON string.
+func (codec BotOptsFileJSONCodec) EscapeEnv(s string) string {
+	data, _ := json.Marshal(s)
+	return string(data[1 : len(data)-1])
+}
+
 var envParameterRegex = regexp.MustCompile(`\{\{\s*(\w+)\s*\}\}`)
 
+type botOptsFileEnvEscaper interface {
+	EscapeEnv(string) string
+}
+
 // BotOptsFileCodec decodes and encodes BotOpts file formats.
 type BotOptsFileCodec interface {
 	FromBytes([]byte) (*BotOpts, error)
@@ -148,7 +158,7 @@ func LoadBotOptsFile(codec BotOptsFileCodec, filename string) (*BotOpts, error)
 	if err != nil {
 		return nil, err
 	}
-	data = expandEnvPlaceholdersInFile(data)
+	data = expandEnvPlaceholdersInFile(codec, data)
 	return codec.FromBytes(data)
 }
 
@@ -165,7 +175,7 @@ func SaveBotOptsFile(codec BotOptsFileCodec, filename string, opts *BotOpts) err
 	return nil
 }
 
-func expandEnvPlaceholdersInFile(data []byte) []byte {
+func expandEnvPlaceholdersInFile(codec BotOptsFileCodec, data []byte) []byte {
 	return envParameterRegex.ReplaceAllFunc(data, func(match []byte) []byte {
 		group := envParameterRegex.FindSubmatch(match)
 		if len(group) != 2 {
@@ -173,6 +183,9 @@ func expandEnvPlaceholdersInFile(data []byte) []byte {
 		}
 		key := group[1]
 		value := os.Getenv(string(key))
+		if escaper, ok := codec.(botOptsFileEnvEscaper); ok {
+			value = escaper.EscapeEnv(value)
+		}
 		return []byte(value)
 	})
 }

bot_opts_loader_test.go

@@ -82,6 +82,25 @@ func TestLoadBotOptsFileExpandsEnvPlaceholders(t *testing.T) {
 	}
 }
 
+func TestLoadBotOptsFileEscapesEnvironmentValuesForJSON(t *testing.T) {
+	want := "quote: \"; slash: \\; newline:\n; tab:\t; control:\x01"
+	t.Setenv("TG_TOKEN", want)
+
+	dir := t.TempDir()
+	filename := filepath.Join(dir, "config.json")
+	if err := os.WriteFile(filename, []byte(`{"token":"{{TG_TOKEN}}"}`), 0o644); err != nil {
+		t.Fatalf("WriteFile returned error: %v", err)
+	}
+
+	got, err := LoadBotOptsFile(BotOptsFileJSONCodec{}, filename)
+	if err != nil {
+		t.Fatalf("LoadBotOptsFile returned error: %v", err)
+	}
+	if got.Token != want {
+		t.Fatalf("unexpected token: got %q want %q", got.Token, want)
+	}
+}
+
 func TestLoadBotOptsFileReturnsDecodeError(t *testing.T) {
 	dir := t.TempDir()
 	filename := filepath.Join(dir, "config.json")

bot_register.go

@@ -19,6 +19,12 @@ func (bot *Bot[T]) AddPlugins(plugin ...*Plugin[T]) *Bot[T] {
 		return bot
 	}
 	level := bot.GetLoggerLevel()
+	sceneOwners := make(map[string]string)
+	for _, registered := range bot.plugins {
+		for name := range registered.scenes {
+			sceneOwners[name] = registered.name
+		}
+	}
 	for _, p := range plugin {
 		if p == nil {
 			if bot.logger != nil {
@@ -27,6 +33,16 @@ func (bot *Bot[T]) AddPlugins(plugin ...*Plugin[T]) *Bot[T] {
 			continue
 		}
 		cloned := clonePlugin(p)
+		for name := range cloned.scenes {
+			if owner, duplicate := sceneOwners[name]; duplicate {
+				if bot.logger != nil {
+					bot.logger.Warnf("scene %q from plugin %q duplicates plugin %q; skipping", name, cloned.name, owner)
+				}
+				delete(cloned.scenes, name)
+				continue
+			}
+			sceneOwners[name] = cloned.name
+		}
 		if cloned.logger == nil {
 			cloned.logger = utils.CreateLogger(cloned.name, level, bot.logFormat, bot.logFormatter)
 			cloned.loggerOwned = true

bot_webhook.go

@@ -152,6 +152,9 @@ func (bot *Bot[T]) RunWebhookWithContext(ctx context.Context, opts *BotWebhookOp
 	if opts.MaxConnections > 100 || opts.MaxConnections <= 0 {
 		return ErrBotWebhookOptsMaxConnectionsRange
 	}
+	if err := validateWebhookSecretToken(opts.SecretToken); err != nil {
+		return err
+	}
 	if err := validateWebhookPath(opts.Path, opts.UseStatusPath); err != nil {
 		return err
 	}
@@ -165,7 +168,7 @@ func (bot *Bot[T]) RunWebhookWithContext(ctx context.Context, opts *BotWebhookOp
 
 	return bot.runWebhookRuntime(ctx, func(runCtx context.Context) error {
 		if autoSecret != "" {
-			bot.webhookLogger.Warnln("Using webhook without secret is very dangerous. Using random 32 bytes token:", autoSecret)
+			bot.webhookLogger.Warnln("No webhook secret was configured; generated a random secret token")
 		}
 		i, err := bot.api.GetWebhookInfoWithContext(runCtx)
 		if err != nil {
@@ -381,8 +384,11 @@ func (bot *Bot[T]) newWebhookMux(ctx context.Context, opts *BotWebhookOpts) *htt
 }
 func (bot *Bot[T]) baseRunWebhook(ctx context.Context, opts *BotWebhookOpts, runFunc func(*http.Server, chan error)) error {
 	srv := &http.Server{
-		Addr:    fmt.Sprintf(":%d", opts.LocalPort),
-		Handler: bot.newWebhookMux(ctx, opts),
+		Addr:              fmt.Sprintf(":%d", opts.LocalPort),
+		Handler:           bot.newWebhookMux(ctx, opts),
+		ReadHeaderTimeout: 5 * time.Second,
+		ReadTimeout:       10 * time.Second,
+		IdleTimeout:       60 * time.Second,
 	}
 	errCh := make(chan error, 1)
 
@@ -442,6 +448,21 @@ func validateWebhookPath(path string, useStatusPath bool) error {
 	return nil
 }
 
+func validateWebhookSecretToken(token string) error {
+	if len(token) < 1 || len(token) > 256 {
+		return ErrBotWebhookOptsSecretTokenInvalid
+	}
+	for _, r := range token {
+		if (r < 'A' || r > 'Z') &&
+			(r < 'a' || r > 'z') &&
+			(r < '0' || r > '9') &&
+			r != '_' && r != '-' {
+			return ErrBotWebhookOptsSecretTokenInvalid
+		}
+	}
+	return nil
+}
+
 func validateWebhookTLSFiles(tlsFiles []string) error {
 	switch len(tlsFiles) {
 	case 0, 2:

bot_webhook_test.go

@@ -255,6 +255,33 @@ func TestValidateWebhookTLSFiles(t *testing.T) {
 	}
 }
 
+func TestValidateWebhookSecretToken(t *testing.T) {
+	tests := []struct {
+		name    string
+		token   string
+		wantErr bool
+	}{
+		{name: "minimum", token: "a"},
+		{name: "allowed alphabet", token: "AZaz09_-"},
+		{name: "maximum", token: strings.Repeat("a", 256)},
+		{name: "empty", token: "", wantErr: true},
+		{name: "too long", token: strings.Repeat("a", 257), wantErr: true},
+		{name: "padding", token: "abc=", wantErr: true},
+		{name: "non ASCII", token: "секрет", wantErr: true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := validateWebhookSecretToken(tt.token)
+			if tt.wantErr && !errors.Is(err, ErrBotWebhookOptsSecretTokenInvalid) {
+				t.Fatalf("expected ErrBotWebhookOptsSecretTokenInvalid, got %v", err)
+			}
+			if !tt.wantErr && err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+		})
+	}
+}
+
 func TestUpdateHandlerRejectsOversizedBody(t *testing.T) {
 	bot := &Bot[NoData]{
 		updateQueue:   make(chan *tgapi.Update, 1),

cmd_generator.go

@@ -1,6 +1,7 @@
 package laniakea
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"regexp"
@@ -10,7 +11,6 @@ import (
 	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 )
 
-// cmdRegexp matches command names allowed for Telegram command registration.
 var cmdRegexp = regexp.MustCompile("^[_a-z0-9]{1,32}$")
 
 // ErrTooManyCommands is returned when the total number of registered commands
@@ -39,9 +39,9 @@ func generateBotCommand[T any](cmd *Command[T]) tgapi.BotCommand {
 	usage := fmt.Sprintf("Usage: /%s %s", cmd.command, strings.Join(descArgs, " "))
 	if desc != "" {
 		desc = fmt.Sprintf("%s. %s", desc, usage)
-		return tgapi.BotCommand{Command: cmd.command, Description: desc}
+		return tgapi.BotCommand{Command: cmd.command, Description: desc, IsEphemeral: cmd.isEphemeral}
 	}
-	return tgapi.BotCommand{Command: cmd.command, Description: usage}
+	return tgapi.BotCommand{Command: cmd.command, Description: usage, IsEphemeral: cmd.isEphemeral}
 }
 
 func checkCmdRegex(cmd string) bool { return cmdRegexp.MatchString(cmd) }
@@ -79,15 +79,8 @@ func gatherCommands[T any](bot *Bot[T]) []tgapi.BotCommand {
 	return commands
 }
 
-// AutoGenerateCommands registers all plugin-defined commands with Telegram's Bot API
-// across three scopes:
-//   - Private chats (users)
-//   - Group chats
-//   - Group administrators
-//
-// It first deletes existing commands to ensure a clean state, then sets the new
-// set of commands for all scopes. This ensures consistency even if commands were
-// previously modified manually via @BotFather.
+// AutoGenerateCommands replaces plugin-defined commands in the private-chat,
+// group-chat, and all-chat-administrators scopes.
 //
 // Returns ErrTooManyCommands if the total number of commands exceeds 100.
 // Returns any API error from Telegram (e.g., network issues, invalid scope).
@@ -102,40 +95,33 @@ func gatherCommands[T any](bot *Bot[T]) []tgapi.BotCommand {
 //	    log.Fatal(err)
 //	}
 func (bot *Bot[T]) AutoGenerateCommands() error {
+	return bot.AutoGenerateCommandsWithContext(context.Background())
+}
+
+// AutoGenerateCommandsWithContext is the context-aware variant of AutoGenerateCommands.
+func (bot *Bot[T]) AutoGenerateCommandsWithContext(ctx context.Context) error {
 	commands := gatherCommands(bot)
 	if len(commands) > 100 {
 		return ErrTooManyCommands
 	}
 
-	// Clear existing commands to avoid duplication or stale entries
-	_, err := bot.api.DeleteMyCommands(tgapi.DeleteMyCommands{})
-	if err != nil {
-		return fmt.Errorf("failed to delete existing commands: %w", err)
-	}
-
 	// Register commands for each scope
-	scopes := []*tgapi.BotCommandScope{
+	scopes := []tgapi.BotCommandScope{
 		{Type: tgapi.BotCommandScopePrivateType},
 		{Type: tgapi.BotCommandScopeGroupType},
 		{Type: tgapi.BotCommandScopeAllChatAdministratorsType},
 	}
 
-	for _, scope := range scopes {
-		_, err = bot.api.SetMyCommands(tgapi.SetMyCommands{
-			Commands: commands,
-			Scope:    scope,
-		})
-		if err != nil {
-			return fmt.Errorf("failed to set commands for scope %q: %w", scope.Type, err)
+	for i := range scopes {
+		if err := bot.setCommandsForScope(ctx, &scopes[i], commands); err != nil {
+			return err
 		}
 	}
-
 	return nil
 }
 
 // AutoGenerateCommandsForScope registers all plugin-defined commands with Telegram's Bot API
-// for the specified command scope. It first deletes any existing commands in that scope
-// to ensure a clean state, then sets the new set of commands.
+// for the specified command scope. A nil scope selects Telegram's default scope.
 //
 // The scope parameter defines where the commands should be available (e.g., private chats,
 // group chats, chat administrators). See tgapi.BotCommandScope and its predefined types.
@@ -150,22 +136,30 @@ func (bot *Bot[T]) AutoGenerateCommands() error {
 //	    log.Fatal(err)
 //	}
 func (bot *Bot[T]) AutoGenerateCommandsForScope(scope *tgapi.BotCommandScope) error {
+	return bot.AutoGenerateCommandsForScopeWithContext(context.Background(), scope)
+}
+
+// AutoGenerateCommandsForScopeWithContext is the context-aware variant of
+// AutoGenerateCommandsForScope.
+func (bot *Bot[T]) AutoGenerateCommandsForScopeWithContext(ctx context.Context, scope *tgapi.BotCommandScope) error {
 	commands := gatherCommands(bot)
 	if len(commands) > 100 {
 		return ErrTooManyCommands
 	}
+	return bot.setCommandsForScope(ctx, scope, commands)
+}
 
-	_, err := bot.api.DeleteMyCommands(tgapi.DeleteMyCommands{Scope: scope})
-	if err != nil {
-		return fmt.Errorf("failed to delete existing commands: %w", err)
+func (bot *Bot[T]) setCommandsForScope(ctx context.Context, scope *tgapi.BotCommandScope, commands []tgapi.BotCommand) error {
+	if len(commands) > 100 {
+		return ErrTooManyCommands
 	}
-
-	_, err = bot.api.SetMyCommands(tgapi.SetMyCommands{
-		Commands: commands,
-		Scope:    scope,
-	})
+	_, err := bot.api.SetMyCommandsWithContext(ctx, tgapi.SetMyCommands{Scope: scope, Commands: commands})
 	if err != nil {
-		return fmt.Errorf("failed to set commands for scope %q: %w", scope.Type, err)
+		scopeType := tgapi.BotCommandScopeDefaultType
+		if scope != nil {
+			scopeType = scope.Type
+		}
+		return fmt.Errorf("failed to set commands for scope %q: %w", scopeType, err)
 	}
 	return nil
 }

cmd_generator_test.go

@@ -83,3 +83,50 @@ func TestGatherCommandsForPluginReturnsSortedCommands(t *testing.T) {
 		t.Fatalf("unexpected command order: got %v want %v", got, want)
 	}
 }
+
+func TestAutoGenerateCommandsForNilScopeUsesSingleAtomicReplacement(t *testing.T) {
+	var methods []string
+	client := &http.Client{
+		Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			methods = append(methods, req.URL.Path)
+			return &http.Response{
+				StatusCode: http.StatusOK,
+				Header:     http.Header{"Content-Type": []string{"application/json"}},
+				Body:       io.NopCloser(strings.NewReader(`{"ok":true,"result":true}`)),
+			}, nil
+		}),
+	}
+	api := tgapi.NewAPI(
+		tgapi.NewAPIOpts("token").
+			SetAPIURL("https://example.test").
+			SetHTTPClient(client),
+	)
+	defer func() {
+		if err := api.Close(); err != nil {
+			t.Fatalf("Close returned error: %v", err)
+		}
+	}()
+
+	plugin := NewPlugin[NoData]("commands")
+	plugin.Command("start", func(ctx *MessageContext, db NoData) error { return nil })
+	bot := &Bot[NoData]{
+		api:     api,
+		logger:  sneklog.NewLogger(),
+		plugins: []Plugin[NoData]{*plugin},
+	}
+	defer func() {
+		if err := bot.logger.Close(); err != nil {
+			t.Fatalf("Close logger returned error: %v", err)
+		}
+	}()
+
+	if err := bot.AutoGenerateCommandsForScope(nil); err != nil {
+		t.Fatalf("AutoGenerateCommandsForScope returned error: %v", err)
+	}
+	if len(methods) != 1 {
+		t.Fatalf("expected one request, got %d", len(methods))
+	}
+	if !strings.HasSuffix(methods[0], "/setMyCommands") {
+		t.Fatalf("expected setMyCommands request, got %v", methods[0])
+	}
+}

commands.go

@@ -93,6 +93,7 @@ type Command[T AppData] struct {
 	args        extypes.Slice[CommandArg]    // List of expected arguments
 	middlewares extypes.Slice[Middleware[T]] // Optional middleware chain
 	skipAutoCmd bool                         // If true, this command won't be auto-added to help menus
+	isEphemeral bool
 }
 
 // NewCommand creates a new Command with the given identifier, executor, and arguments.
@@ -108,7 +109,9 @@ type Command[T AppData] struct {
 // that fit Telegram's callback_data limit, though the configured payload
 // encoding may impose its own restrictions.
 func NewCommand[T any](command string, exec CommandExecutor[T], args ...CommandArg) *Command[T] {
-	return &Command[T]{command, "", exec, args, make(extypes.Slice[Middleware[T]], 0), false}
+	return &Command[T]{
+		command, "", exec, args, make(extypes.Slice[Middleware[T]], 0), false, false,
+	}
 }
 
 // Use adds a middleware to the command's execution chain.
@@ -130,6 +133,14 @@ func (c *Command[T]) SkipCommandAutoGen() *Command[T] {
 	return c
 }
 
+// SetEphemeral controls whether Telegram treats the command as ephemeral.
+//
+// Since: Bot API 10.2
+func (c *Command[T]) SetEphemeral(b bool) *Command[T] {
+	c.isEphemeral = b
+	return c
+}
+
 func (c *Command[T]) validateArgs(args []string) error {
 	for i := range c.args.Len() {
 		if i >= len(args) && c.args.Get(i).required {

drafts.go

@@ -129,7 +129,19 @@ type Draft struct {
 //
 // The caller must set a chat with SetChat before Push or Flush.
 func (p *DraftProvider) NewDraft(parseMode tgapi.ParseMode) *Draft {
-	id := p.generator.Next()
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	var id uint64
+	for {
+		id = p.generator.Next()
+		if id == 0 {
+			continue
+		}
+		if _, exists := p.drafts[id]; !exists {
+			break
+		}
+	}
 	draft := &Draft{
 		api:       p.api,
 		provider:  p,
@@ -137,9 +149,7 @@ func (p *DraftProvider) NewDraft(parseMode tgapi.ParseMode) *Draft {
 		ID:        id,
 		Message:   "",
 	}
-	p.mu.Lock()
 	p.drafts[id] = draft
-	p.mu.Unlock()
 	return draft
 }
 
@@ -154,10 +164,9 @@ func (d *Draft) SetChat(chatID int64, messageThreadID int) *Draft {
 
 // SetEntities replaces the draft's message entities.
 //
-// Entities are stored by reference. If you plan to mutate the slice later,
-// pass a copy: `SetEntities(append([]tgapi.MessageEntity{}, myEntities...))`.
+// The entities slice is copied.
 func (d *Draft) SetEntities(entities []tgapi.MessageEntity) *Draft {
-	d.entities = entities
+	d.entities = append([]tgapi.MessageEntity(nil), entities...)
 	return d
 }
 
@@ -220,6 +229,9 @@ func (d *Draft) Flush() error {
 	if err := validateMessageText(d.Message); err != nil {
 		return err
 	}
+	if d.api == nil {
+		return ErrAPIIsNil
+	}
 
 	params := tgapi.SendMessage{
 		ChatID:    d.chatID,
@@ -252,6 +264,9 @@ func (d *Draft) push(text string) error {
 		return err
 	}
 	d.Message = candidate
+	if d.api == nil {
+		return ErrAPIIsNil
+	}
 	params := tgapi.SendMessageDraft{
 		ChatID:    d.chatID,
 		DraftID:   d.ID,

drafts_test.go

@@ -9,6 +9,17 @@ import (
 	"git.scuroneko.dev/scuroneko/sneklog/v2"
 )
 
+type sequenceDraftIDGenerator struct {
+	ids []uint64
+	pos int
+}
+
+func (g *sequenceDraftIDGenerator) Next() uint64 {
+	id := g.ids[g.pos]
+	g.pos++
+	return id
+}
+
 func TestDraftFlushRequiresChatID(t *testing.T) {
 	draft := NewRandomDraftProvider(&tgapi.API{}).NewDraft(tgapi.ParseNone)
 	draft.Message = "hello"
@@ -38,6 +49,34 @@ func TestMsgContextNewDraftWorksWithoutLimiter(t *testing.T) {
 	}
 }
 
+func TestDraftProviderSkipsZeroAndCollidingIDs(t *testing.T) {
+	provider := &DraftProvider{
+		api:       &tgapi.API{},
+		drafts:    make(map[uint64]*Draft),
+		generator: &sequenceDraftIDGenerator{ids: []uint64{0, 7, 7, 8}},
+	}
+
+	first := provider.NewDraft(tgapi.ParseNone)
+	second := provider.NewDraft(tgapi.ParseNone)
+	if first.ID != 7 || second.ID != 8 {
+		t.Fatalf("unexpected draft IDs: first=%d second=%d", first.ID, second.ID)
+	}
+	if got := len(provider.drafts); got != 2 {
+		t.Fatalf("collision overwrote a draft: got %d drafts", got)
+	}
+}
+
+func TestDraftReturnsErrorWhenAPIIsNil(t *testing.T) {
+	draft := NewLinearDraftProvider(nil, 0).NewDraft(tgapi.ParseNone).SetChat(42, 0)
+	if err := draft.Push("hello"); !errors.Is(err, ErrAPIIsNil) {
+		t.Fatalf("expected ErrAPIIsNil from Push, got %v", err)
+	}
+	draft.Message = "hello"
+	if err := draft.Flush(); !errors.Is(err, ErrAPIIsNil) {
+		t.Fatalf("expected ErrAPIIsNil from Flush, got %v", err)
+	}
+}
+
 func TestDraftFlushRejectsLongMessage(t *testing.T) {
 	draft := NewRandomDraftProvider(&tgapi.API{}).NewDraft(tgapi.ParseNone).SetChat(42, 0)
 	draft.Message = strings.Repeat("a", maxMessageTextLen+1)

error_model.go

@@ -8,6 +8,7 @@ type classifiedError struct {
 	internalOnly bool
 }
 
+// Error returns the underlying error message.
 func (e *classifiedError) Error() string {
 	if e == nil || e.err == nil {
 		return ""
@@ -15,6 +16,7 @@ func (e *classifiedError) Error() string {
 	return e.err.Error()
 }
 
+// Unwrap returns the underlying error.
 func (e *classifiedError) Unwrap() error {
 	if e == nil {
 		return nil

errors.go

@@ -69,6 +69,8 @@ var (
 	ErrNoBotWebhookOptsURL = errors.New("empty BotWebhookOpts.URL")
 	// ErrBotWebhookOptsMaxConnectionsRange reports that BotWebhookOpts.MaxConnections is out of range.
 	ErrBotWebhookOptsMaxConnectionsRange = errors.New("BotWebhookOpts.MaxConnections must be between 1 and 100")
+	// ErrBotWebhookOptsSecretTokenInvalid reports that SecretToken violates Telegram's format.
+	ErrBotWebhookOptsSecretTokenInvalid = errors.New("BotWebhookOpts.SecretToken must be 1-256 characters from A-Z, a-z, 0-9, _ and -")
 	// ErrBotUploaderWhenCertificate reports that a certificate was set without an uploader.
 	ErrBotUploaderWhenCertificate = errors.New("bot uploader nil, but certificate set")
 	// ErrStatusPathSecretRequired reports that UseStatusPath requires SecretToken to be set.

handler.go

@@ -56,6 +56,8 @@ func (bot *Bot[T]) handle(parentCtx context.Context, u *tgapi.Update) {
 		ctx:           ctx,
 	}
 	bot.prepareUpdateCtx(u, msgCtx)
+	unlockScenes := bot.sceneLocks.lock(sceneKeysForContext(msgCtx))
+	defer unlockScenes()
 	bot.safeEmitEvent(ctx, UpdateReceivedEvent{
 		UpdateID:   u.UpdateID,
 		UpdateType: u.Type,

handler_test.go

@@ -318,6 +318,15 @@ func TestPrepareUpdateCtxContract(t *testing.T) {
 			wantFrom:   true,
 			wantFromID: 115,
 		},
+		{
+			name: "anonymous poll answer",
+			update: &tgapi.Update{
+				Type:       tgapi.UpdateTypePollAnswer,
+				PollAnswer: &tgapi.PollAnswer{VoterChat: tgapi.Chat{ID: -2007}},
+			},
+			wantChat:   true,
+			wantChatID: -2007,
+		},
 		{
 			name: "message reaction",
 			update: &tgapi.Update{
@@ -368,8 +377,64 @@ func TestPrepareUpdateCtxContract(t *testing.T) {
 			name: "message reaction count",
 			update: &tgapi.Update{
 				Type:                 tgapi.UpdateTypeMessageReactionCount,
-				MessageReactionCount: &tgapi.MessageReactionCountUpdated{},
+				MessageReactionCount: &tgapi.MessageReactionCountUpdated{Chat: &tgapi.Chat{ID: -2008}},
 			},
+			wantChat:   true,
+			wantChatID: -2008,
+		},
+		{
+			name: "guest message",
+			update: &tgapi.Update{
+				Type: tgapi.UpdateTypeGuestMessage,
+				GuestMessage: &tgapi.Message{
+					From: &tgapi.User{ID: 119},
+					Chat: &tgapi.Chat{ID: -2009},
+				},
+			},
+			wantMsg:    true,
+			wantFrom:   true,
+			wantFromID: 119,
+			wantChat:   true,
+			wantChatID: -2009,
+		},
+		{
+			name: "deleted business messages",
+			update: &tgapi.Update{
+				Type:                    tgapi.UpdateTypeDeletedBusinessMessages,
+				DeletedBusinessMessages: &tgapi.BusinessMessagesDeleted{Chat: tgapi.Chat{ID: -2010}},
+			},
+			wantChat:   true,
+			wantChatID: -2010,
+		},
+		{
+			name: "managed bot",
+			update: &tgapi.Update{
+				Type:       tgapi.UpdateTypeManagedBot,
+				ManagedBot: &tgapi.ManagedBotUpdated{User: tgapi.User{ID: 120}},
+			},
+			wantFrom:   true,
+			wantFromID: 120,
+		},
+		{
+			name: "subscription",
+			update: &tgapi.Update{
+				Type:         tgapi.UpdateTypeSubscription,
+				Subscription: &tgapi.BotSubscriptionUpdated{User: tgapi.User{ID: 121}},
+			},
+			wantFrom:   true,
+			wantFromID: 121,
+		},
+		{
+			name: "giveaway chat boost has no user",
+			update: &tgapi.Update{
+				Type: tgapi.UpdateTypeChatBoost,
+				ChatBoost: &tgapi.ChatBoostUpdated{
+					Chat:  tgapi.Chat{ID: -2011},
+					Boost: tgapi.ChatBoost{Source: tgapi.ChatBoostSource{Source: "giveaway"}},
+				},
+			},
+			wantChat:   true,
+			wantChatID: -2011,
 		},
 	}
 

keyboard.go

@@ -59,9 +59,12 @@ func (b InlineKeyboardButtonBuilder) SetStyle(style tgapi.KeyboardButtonStyle) I
 }
 
 // SetURL sets a URL that will be opened when the button is pressed.
-// If both URL and CallbackData are set, Telegram will prioritize URL.
+// It clears callback data because Telegram requires exactly one button action.
 func (b InlineKeyboardButtonBuilder) SetURL(url string) InlineKeyboardButtonBuilder {
 	b.url = url
+	if url != "" {
+		b.data = ""
+	}
 	return b
 }
 
@@ -79,26 +82,29 @@ func (b InlineKeyboardButtonBuilder) SetPayloadType(t BotPayloadType) InlineKeyb
 //
 // Example: SetCallbackDataJSON("delete_user", 123, "confirm") → {"cmd":"delete_user","args":["123","confirm"]}.
 func (b InlineKeyboardButtonBuilder) SetCallbackDataJSON(cmd string, args ...any) InlineKeyboardButtonBuilder {
+	b.url = ""
 	b.data = NewCallbackData(cmd, args...).ToJSON()
 	return b
 }
 
-// SetCallbackDataBase64 sets a structured callback payload encoded as Base64.
-// This can be useful when the JSON payload exceeds Telegram's callback data length limit.
-// Args are converted to strings using fmt.Sprint.
+// SetCallbackDataBase64 sets a Base64-encoded structured callback payload.
+// Base64 does not bypass Telegram's 64-byte callback-data limit.
 func (b InlineKeyboardButtonBuilder) SetCallbackDataBase64(cmd string, args ...any) InlineKeyboardButtonBuilder {
+	b.url = ""
 	b.data = NewCallbackData(cmd, args...).ToBase64()
 	return b
 }
 
 // SetCallbackDataCompact sets a structured callback payload encoded as compact text.
 func (b InlineKeyboardButtonBuilder) SetCallbackDataCompact(cmd string, args ...any) InlineKeyboardButtonBuilder {
+	b.url = ""
 	b.data = NewCallbackData(cmd, args...).ToCompact()
 	return b
 }
 
 // SetCallbackDataCompactBase64 sets a compact callback payload encoded as Base64.
 func (b InlineKeyboardButtonBuilder) SetCallbackDataCompactBase64(cmd string, args ...any) InlineKeyboardButtonBuilder {
+	b.url = ""
 	b.data = NewCallbackData(cmd, args...).ToCompactBase64()
 	return b
 }
@@ -106,6 +112,7 @@ func (b InlineKeyboardButtonBuilder) SetCallbackDataCompactBase64(cmd string, ar
 // SetCallbackData sets a structured callback payload using the configured payload type.
 // The default payload type is JSON.
 func (b InlineKeyboardButtonBuilder) SetCallbackData(cmd string, args ...any) InlineKeyboardButtonBuilder {
+	b.url = ""
 	switch b.payloadType {
 	case BotPayloadJSON:
 		b.data = NewCallbackData(cmd, args...).ToJSON()
@@ -269,7 +276,11 @@ func (in *InlineKeyboard) Get() *tgapi.ReplyMarkup {
 	if in.CurrentLine.Len() > 0 {
 		in.AddLine()
 	}
-	return &tgapi.ReplyMarkup{InlineKeyboard: in.Lines}
+	lines := make([][]tgapi.InlineKeyboardButton, len(in.Lines))
+	for i := range in.Lines {
+		lines[i] = append([]tgapi.InlineKeyboardButton(nil), in.Lines[i]...)
+	}
+	return &tgapi.ReplyMarkup{InlineKeyboard: lines}
 }
 
 // CallbackData represents the structured payload sent when an inline button
@@ -297,10 +308,7 @@ func NewCallbackData(command string, args ...any) CallbackData {
 	for i, arg := range args {
 		stringArgs[i] = fmt.Sprint(arg)
 	}
-	return CallbackData{
-		Command: command,
-		Args:    stringArgs,
-	}
+	return CallbackData{Command: command, Args: stringArgs}
 }
 
 // All To* encoders return an empty string when serialization fails. Telegram

keyboard_test.go

@@ -73,6 +73,35 @@ func TestInlineKeyboardButtonBuilderSetCallbackDataUsesConfiguredPayloadType(t *
 	}
 }
 
+func TestInlineKeyboardButtonBuilderKeepsExactlyOneAction(t *testing.T) {
+	callback := NewInlineKeyboardButton("Action").
+		SetURL("https://example.test").
+		SetCallbackDataJSON("confirm").
+		build()
+	if callback.URL != "" || callback.CallbackData == "" {
+		t.Fatalf("callback action was not exclusive: %#v", callback)
+	}
+
+	link := NewInlineKeyboardButton("Action").
+		SetCallbackDataJSON("confirm").
+		SetURL("https://example.test").
+		build()
+	if link.URL == "" || link.CallbackData != "" {
+		t.Fatalf("URL action was not exclusive: %#v", link)
+	}
+}
+
+func TestInlineKeyboardGetReturnsIndependentMarkup(t *testing.T) {
+	keyboard := NewInlineKeyboardJSON(1).AddURLButton("Docs", "https://example.test")
+	first := keyboard.Get()
+	first.InlineKeyboard[0][0].Text = "mutated"
+
+	second := keyboard.Get()
+	if got := second.InlineKeyboard[0][0].Text; got != "Docs" {
+		t.Fatalf("Get exposed builder state for mutation: got %q", got)
+	}
+}
+
 func TestInlineKeyboardGetPayloadTypeReturnsLocalOverride(t *testing.T) {
 	kb := NewInlineKeyboardJSON(2)
 	if got := kb.GetPayloadType(); got != BotPayloadJSON {

l10n.go

@@ -1,6 +1,9 @@
 package laniakea
 
-import "sync"
+import (
+	"maps"
+	"sync"
+)
 
 // DictEntry maps language codes to translated strings.
 type DictEntry map[string]string
@@ -64,8 +67,6 @@ func cloneDictEntry(src DictEntry) DictEntry {
 		return nil
 	}
 	cloned := make(DictEntry, len(src))
-	for lang, text := range src {
-		cloned[lang] = text
-	}
+	maps.Copy(cloned, src)
 	return cloned
 }

msg_context.go

@@ -8,9 +8,9 @@ import (
 	"reflect"
 	"strconv"
 	"strings"
-	"time"
 
 	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/tgrich"
 	"git.scuroneko.dev/scuroneko/sneklog/v2"
 )
 
@@ -550,28 +550,19 @@ func (ctx *MessageContext) newDraft(parseMode tgapi.ParseMode) *Draft {
 		return nil
 	}
 
-	if ctx.API.Limiter != nil {
-		c, cancel := context.WithTimeout(ctx.Context(), 5*time.Second)
-		defer cancel()
-		if err := ctx.API.Limiter.Wait(c, ctx.Msg.Chat.ID); err != nil {
-			ctx.Logger.Errorln(err)
-			return nil
-		}
-	}
-
 	draft := ctx.draftProvider.NewDraft(parseMode).SetChat(ctx.Msg.Chat.ID, ctx.Msg.MessageThreadID)
 	return draft
 }
 
 // NewDraft creates a new message draft associated with the current chat.
-// Uses the API limiter to avoid rate limiting.
+// Draft sends are rate-limited by the API client.
 func (ctx *MessageContext) NewDraft() *Draft {
 	return ctx.newDraft(tgapi.ParseNone)
 }
 
 // NewDraftMarkdown creates a new message draft associated with the current chat,
 // with Markdown V2 parse mode enabled.
-// Uses the API limiter to avoid rate limiting.
+// Draft sends are rate-limited by the API client.
 func (ctx *MessageContext) NewDraftMarkdown() *Draft {
 	return ctx.newDraft(tgapi.ParseMarkdownV2)
 }
@@ -821,3 +812,55 @@ func (ctx *MessageContext) UpsertKeyboard(text string, keyboard *InlineKeyboard)
 func (ctx *MessageContext) UpsertKeyboardMarkdown(text string, keyboard *InlineKeyboard) *AnswerMessage {
 	return ctx.upsertKeyboard(text, keyboard, tgapi.ParseMarkdownV2)
 }
+
+func (ctx *MessageContext) richAnswer(rich tgapi.InputRichMessage, keyboard *InlineKeyboard) *AnswerMessage {
+	if ctx.Msg == nil {
+		ctx.Logger.Errorln(ErrMessageContextNil)
+		return nil
+	}
+	params := tgapi.SendRichMessage{
+		ChatID:      ctx.Msg.Chat.ID,
+		RichMessage: rich,
+	}
+	if keyboard != nil {
+		params.ReplyMarkup = keyboard.Get()
+	}
+	if ctx.Msg.MessageThreadID > 0 {
+		params.MessageThreadID = int64(ctx.Msg.MessageThreadID)
+	}
+	if ctx.Msg.DirectMessageTopic != nil {
+		params.DirectMessagesTopicID = ctx.Msg.DirectMessageTopic.TopicID
+	}
+
+	msg, err := ctx.API.SendRichMessageWithContext(ctx.Context(), params)
+	if err != nil {
+		ctx.Logger.Errorln(err)
+		return nil
+	}
+	return &AnswerMessage{
+		MessageID: msg.MessageID, ctx: ctx, Text: rich.HTML, IsMedia: false,
+	}
+}
+
+func (ctx *MessageContext) richBlocksAnswer(keyboard *InlineKeyboard, blocks ...tgapi.InputRichBlock) *AnswerMessage {
+	rich, err := tgrich.BuildHTML(blocks...)
+	if err != nil {
+		ctx.Logger.Errorln(err)
+		return nil
+	}
+	return ctx.richAnswer(rich, keyboard)
+}
+
+// RichAnswer builds and sends input rich-message blocks.
+//
+// Since: Bot API 10.2
+func (ctx *MessageContext) RichAnswer(blocks ...tgapi.InputRichBlock) *AnswerMessage {
+	return ctx.richBlocksAnswer(nil, blocks...)
+}
+
+// RichAnswerKeyboard builds and sends input rich-message blocks with an inline keyboard.
+//
+// Since: Bot API 10.2
+func (ctx *MessageContext) RichAnswerKeyboard(keyboard *InlineKeyboard, blocks ...tgapi.InputRichBlock) *AnswerMessage {
+	return ctx.richBlocksAnswer(keyboard, blocks...)
+}

msg_context_test.go

@@ -10,9 +10,65 @@ import (
 	"testing"
 
 	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/tgrich"
 	"git.scuroneko.dev/scuroneko/sneklog/v2"
 )
 
+func TestRichAnswerBuildsInputBlocks(t *testing.T) {
+	var gotBody map[string]any
+	client := &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		body, err := io.ReadAll(req.Body)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if err := json.Unmarshal(body, &gotBody); err != nil {
+			t.Fatal(err)
+		}
+		return &http.Response{
+			StatusCode: http.StatusOK,
+			Header:     http.Header{"Content-Type": []string{"application/json"}},
+			Body:       io.NopCloser(strings.NewReader(`{"ok":true,"result":{"message_id":9,"date":1}}`)),
+		}, nil
+	})}
+	api := tgapi.NewAPI(tgapi.NewAPIOpts("token").SetAPIURL("https://example.test").SetHTTPClient(client))
+	defer func() { _ = api.Close() }()
+	ctx := &MessageContext{
+		API:    api,
+		Msg:    &tgapi.Message{Chat: &tgapi.Chat{ID: 42, Type: tgapi.ChatTypePrivate}},
+		Logger: sneklog.NewLogger(),
+	}
+
+	answer := ctx.RichAnswer(tgrich.P(tgrich.Bold(tgrich.Text("ready"))))
+	if answer == nil {
+		t.Fatal("RichAnswer() returned nil")
+	}
+	rich, ok := gotBody["rich_message"].(map[string]any)
+	if !ok || rich["html"] != "<p><b>ready</b></p>" {
+		t.Fatalf("rich_message = %#v", gotBody["rich_message"])
+	}
+	if _, exists := rich["skip_entity_detection"]; exists {
+		t.Fatalf("rich_message unexpectedly disables entity detection: %#v", rich)
+	}
+}
+
+func TestRichAnswerRejectsInvalidBlocksWithoutRequest(t *testing.T) {
+	client := &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		t.Fatal("unexpected HTTP request")
+		return nil, nil
+	})}
+	api := tgapi.NewAPI(tgapi.NewAPIOpts("token").SetAPIURL("https://example.test").SetHTTPClient(client))
+	defer func() { _ = api.Close() }()
+	ctx := &MessageContext{
+		API:    api,
+		Msg:    &tgapi.Message{Chat: &tgapi.Chat{ID: 42, Type: tgapi.ChatTypePrivate}},
+		Logger: sneklog.NewLogger(),
+	}
+
+	if answer := ctx.RichAnswer(tgrich.H(tgrich.Text("invalid"), 0)); answer != nil {
+		t.Fatal("RichAnswer() returned an answer for an invalid heading")
+	}
+}
+
 func TestAnswerPhotoIncludesDirectMessagesTopicID(t *testing.T) {
 	var gotBody map[string]any
 

observer.go

@@ -16,6 +16,8 @@ const (
 	HandlerCommandKind HandlerEventKind = "command"
 	// HandlerMessageKind identifies a message fallback handler.
 	HandlerMessageKind HandlerEventKind = "message"
+	// HandlerMiddlewareKind identifies middleware execution.
+	HandlerMiddlewareKind HandlerEventKind = "middleware"
 	// HandlerPayloadKind identifies a callback payload handler.
 	HandlerPayloadKind HandlerEventKind = "payload"
 	// HandlerUpdateKind identifies a generic update handler.
@@ -41,6 +43,24 @@ type Event interface {
 	isEvent()
 }
 
+func emitContextError(ctx *MessageContext, event ErrorEvent) {
+	if ctx == nil {
+		return
+	}
+	if ctx.Logger != nil {
+		ctx.Logger.Errorln(event.Err)
+	}
+	if ctx.observer == nil {
+		return
+	}
+	defer func() {
+		if recovered := recover(); recovered != nil && ctx.Logger != nil {
+			ctx.Logger.Errorln(fmt.Sprintf("panic in observer: %v", recovered))
+		}
+	}()
+	ctx.observer.OnError(ctx.Context(), event)
+}
+
 // UpdateReceivedEvent describes an update entering the bot runtime.
 type UpdateReceivedEvent struct {
 	UpdateID   int
@@ -162,9 +182,15 @@ func (bot *Bot[T]) safeEmitEvent(ctx context.Context, event Event) {
 	}
 	defer func() {
 		if r := recover(); r != nil {
-			bot.logger.Errorln(fmt.Sprintf("panic in observer: %v", r))
+			if bot.logger != nil {
+				bot.logger.Errorln(fmt.Sprintf("panic in observer: %v", r))
+			}
 		}
 	}()
+	bot.emitEvent(ctx, event)
+}
+
+func (bot *Bot[T]) emitEvent(ctx context.Context, event Event) {
 	switch e := event.(type) {
 	case UpdateReceivedEvent:
 		bot.observer.OnUpdateReceived(ctx, e)

plugins.go

@@ -2,6 +2,7 @@ package laniakea
 
 import (
 	"errors"
+	"fmt"
 
 	"git.scuroneko.dev/scuroneko/extypes"
 	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
@@ -292,6 +293,9 @@ func (p *Plugin[T]) executeMiddlewares(ctx *MessageContext, db T) bool {
 // If async, return value is ignored.
 type MiddlewareExecutor[T AppData] func(ctx *MessageContext, db T) bool
 
+// ErrMiddlewareExecutorNil reports an attempt to execute middleware without a callback.
+var ErrMiddlewareExecutorNil = errors.New("middleware executor is nil")
+
 // Middleware represents a reusable execution interceptor.
 // Can be synchronous (blocking) or asynchronous (non-blocking).
 type Middleware[T AppData] struct {
@@ -306,7 +310,7 @@ func NewMiddleware[T AppData](name string, executor MiddlewareExecutor[T]) Middl
 	return Middleware[T]{name, executor, 0, false}
 }
 
-// SetOrder sets the execution order (currently ignored).
+// SetOrder sets the bot-level middleware execution order.
 func (m Middleware[T]) SetOrder(order int) Middleware[T] {
 	m.order = order
 	return m
@@ -330,12 +334,38 @@ func (m Middleware[T]) SetAsync(async bool) Middleware[T] {
 // must treat those fields as read-only — mutating them races the sync chain
 // that mutates the same context concurrently.
 func (m Middleware[T]) Execute(ctx *MessageContext, db T) bool {
+	if m.executor == nil {
+		reportMiddlewareError(ctx, m.name, ErrMiddlewareExecutorNil)
+		return false
+	}
 	if m.async {
 		ctxCopy := *ctx
 		go func(ctx MessageContext) {
+			defer func() {
+				if recovered := recover(); recovered != nil {
+					reportMiddlewareError(&ctx, m.name, fmt.Errorf("middleware %q panicked: %v", m.name, recovered))
+				}
+			}()
 			m.executor(&ctx, db)
 		}(ctxCopy)
 		return true
 	}
 	return m.executor(ctx, db)
 }
+
+func reportMiddlewareError(ctx *MessageContext, name string, err error) {
+	event := ErrorEvent{
+		Plugin:      "bot",
+		HandlerKind: HandlerMiddlewareKind,
+		HandlerName: name,
+		Err:         err,
+		UserFacing:  false,
+	}
+	if ctx != nil {
+		event.UpdateID = ctx.Update.UpdateID
+		event.UpdateType = ctx.Update.Type
+		event.FromID = ctx.FromID
+		event.ChatID = ctx.ChatID
+	}
+	emitContextError(ctx, event)
+}

plugins_test.go

@@ -1,10 +1,65 @@
 package laniakea
 
 import (
+	"context"
 	"errors"
 	"testing"
+	"time"
+
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 )
 
+type middlewareErrorObserver struct {
+	testObserver
+	errors chan ErrorEvent
+}
+
+func (o *middlewareErrorObserver) OnError(_ context.Context, event ErrorEvent) {
+	o.errors <- event
+}
+
+func TestAsyncMiddlewareRecoversPanic(t *testing.T) {
+	observer := &middlewareErrorObserver{errors: make(chan ErrorEvent, 1)}
+	ctx := &MessageContext{
+		Update:   tgapi.Update{UpdateID: 7, Type: tgapi.UpdateTypeMessage},
+		FromID:   42,
+		ChatID:   100,
+		observer: observer,
+	}
+	middleware := NewMiddleware[NoData]("panic", func(ctx *MessageContext, db NoData) bool {
+		panic("boom")
+	}).SetAsync(true)
+
+	if !middleware.Execute(ctx, NoData{}) {
+		t.Fatal("async middleware blocked execution")
+	}
+	select {
+	case event := <-observer.errors:
+		if event.HandlerKind != HandlerMiddlewareKind || event.HandlerName != "panic" {
+			t.Fatalf("unexpected error event: %#v", event)
+		}
+		if event.Err == nil {
+			t.Fatal("panic error was not reported")
+		}
+	case <-time.After(time.Second):
+		t.Fatal("timed out waiting for async middleware error")
+	}
+}
+
+func TestMiddlewareRejectsNilExecutor(t *testing.T) {
+	observer := &middlewareErrorObserver{errors: make(chan ErrorEvent, 1)}
+	ctx := &MessageContext{observer: observer}
+	middleware := NewMiddleware[NoData]("nil", nil)
+
+	if middleware.Execute(ctx, NoData{}) {
+		t.Fatal("nil middleware executor was accepted")
+	}
+	event := <-observer.errors
+	if !errors.Is(event.Err, ErrMiddlewareExecutorNil) {
+		t.Fatalf("error = %v, want ErrMiddlewareExecutorNil", event.Err)
+	}
+}
+
 func TestValidateArgsRequiresFullMatch(t *testing.T) {
 	intCmd := NewCommand("int", func(ctx *MessageContext, db NoData) error { return nil }, NewCommandArg("n").SetValueType(CommandValueInt).SetRequired())
 	if err := intCmd.validateArgs([]string{"123"}); err != nil {

runners.go

@@ -2,6 +2,7 @@ package laniakea
 
 import (
 	"context"
+	"fmt"
 	"time"
 )
 
@@ -27,6 +28,18 @@ type Runner[T AppData] struct {
 	fn    RunnerFn[T]   // The function to execute
 }
 
+func executeRunner[T AppData](runner Runner[T], bot *Bot[T]) (err error) {
+	defer func() {
+		if recovered := recover(); recovered != nil {
+			err = fmt.Errorf("runner %q panicked: %v", runner.name, recovered)
+		}
+	}()
+	if runner.fn == nil {
+		return fmt.Errorf("runner %q has no function", runner.name)
+	}
+	return runner.fn(bot)
+}
+
 // NewRunner creates a new Runner with the given name and function.
 //
 // The default configuration is async=true and every=0, i.e. a one-shot
@@ -34,12 +47,7 @@ type Runner[T AppData] struct {
 // to customize this. Do not call builder methods concurrently or after the
 // bot runtime has begun executing runners.
 func NewRunner[T AppData](name string, fn RunnerFn[T]) Runner[T] {
-	return Runner[T]{
-		name:  name,
-		fn:    fn,
-		async: true,
-		every: 0,
-	}
+	return Runner[T]{name: name, fn: fn, async: true, every: 0}
 }
 
 // Async sets whether the runner executes synchronously or asynchronously.
@@ -89,7 +97,7 @@ func (bot *Bot[T]) ExecRunners(ctx context.Context) {
 			go func(r Runner[T]) {
 				defer bot.runnerOnceWG.Done()
 				startedAt := time.Now()
-				err := r.fn(bot)
+				err := executeRunner(r, bot)
 				bot.safeEmitEvent(ctx, RunnerFinishedEvent{
 					Name:     r.name,
 					Duration: time.Since(startedAt),
@@ -109,7 +117,7 @@ func (bot *Bot[T]) ExecRunners(ctx context.Context) {
 		} else if runner.every == 0 && !runner.async {
 			// One-time sync: block until done
 			t := time.Now()
-			err := runner.fn(bot)
+			err := executeRunner(runner, bot)
 			elapsed := time.Since(t)
 			bot.safeEmitEvent(ctx, RunnerFinishedEvent{
 				Name:     runner.name,
@@ -150,7 +158,7 @@ func (bot *Bot[T]) ExecRunners(ctx context.Context) {
 						return
 					}
 					startedAt := time.Now()
-					err := r.fn(bot)
+					err := executeRunner(r, bot)
 					bot.safeEmitEvent(ctx, RunnerFinishedEvent{
 						Name:     r.name,
 						Duration: time.Since(startedAt),

runners_test.go

@@ -95,3 +95,30 @@ func TestExecRunnersEmitObserverEvents(t *testing.T) {
 		t.Fatalf("unexpected runner error event: %#v", got)
 	}
 }
+
+func TestExecRunnersRecoversRunnerPanic(t *testing.T) {
+	observer := &runnerObserver{}
+	bot := &Bot[NoData]{
+		logger:   sneklog.NewLogger(),
+		observer: observer,
+		runners: []Runner[NoData]{
+			NewRunner("panic", func(*Bot[NoData]) error {
+				panic("boom")
+			}).Async(false),
+		},
+	}
+	defer func() {
+		if err := bot.logger.Close(); err != nil {
+			t.Fatalf("Close returned error: %v", err)
+		}
+	}()
+
+	bot.ExecRunners(context.Background())
+
+	if len(observer.runners) != 1 || observer.runners[0].Err == nil {
+		t.Fatalf("expected recovered panic in runner event, got %#v", observer.runners)
+	}
+	if len(observer.errors) != 1 || observer.errors[0].Err == nil {
+		t.Fatalf("expected recovered panic in error event, got %#v", observer.errors)
+	}
+}

scene.go

@@ -1,6 +1,7 @@
 package laniakea
 
 import (
+	"bytes"
 	"encoding/json"
 	"maps"
 	"sync"
@@ -131,18 +132,17 @@ type SceneSession struct {
 	Scene string
 	// Step is the current step name inside the active scene.
 	Step string
-	// data stores opaque session payload bytes, typically JSON.
 	data []byte
 }
 
 // SetData stores arbitrary opaque session data.
 func (s *SceneSession) SetData(data []byte) {
-	s.data = data
+	s.data = bytes.Clone(data)
 }
 
 // GetData returns the raw session data payload.
 func (s *SceneSession) GetData() []byte {
-	return s.data
+	return bytes.Clone(s.data)
 }
 
 // HasData reports whether the session has a non-empty data payload.
@@ -198,6 +198,7 @@ func (s *MemorySessionStore) Get(key string) (SceneSession, error) {
 	s.mu.RLock()
 	defer s.mu.RUnlock()
 	if session, ok := s.store[key]; ok {
+		session.data = bytes.Clone(session.data)
 		return session, nil
 	}
 	return SceneSession{}, nil
@@ -205,6 +206,7 @@ func (s *MemorySessionStore) Get(key string) (SceneSession, error) {
 
 // Set stores session under key.
 func (s *MemorySessionStore) Set(key string, session SceneSession) error {
+	session.data = bytes.Clone(session.data)
 	s.mu.Lock()
 	s.store[key] = session
 	s.mu.Unlock()

scene_locks.go

@@ -0,0 +1,80 @@
+package laniakea
+
+import (
+	"sort"
+	"sync"
+)
+
+type sceneLockEntry struct {
+	mu   sync.Mutex
+	refs int
+}
+
+type sceneKeyLocker struct {
+	mu      sync.Mutex
+	entries map[string]*sceneLockEntry
+}
+
+func (l *sceneKeyLocker) lock(keys []string) func() {
+	keys = uniqueSortedStrings(keys)
+	if len(keys) == 0 {
+		return func() {}
+	}
+
+	l.mu.Lock()
+	if l.entries == nil {
+		l.entries = make(map[string]*sceneLockEntry)
+	}
+	entries := make([]*sceneLockEntry, len(keys))
+	for i, key := range keys {
+		entry := l.entries[key]
+		if entry == nil {
+			entry = new(sceneLockEntry)
+			l.entries[key] = entry
+		}
+		entry.refs++
+		entries[i] = entry
+	}
+	l.mu.Unlock()
+
+	for _, entry := range entries {
+		entry.mu.Lock()
+	}
+
+	return func() {
+		for i := len(entries) - 1; i >= 0; i-- {
+			entries[i].mu.Unlock()
+		}
+
+		l.mu.Lock()
+		for i, key := range keys {
+			entries[i].refs--
+			if entries[i].refs == 0 {
+				delete(l.entries, key)
+			}
+		}
+		l.mu.Unlock()
+	}
+}
+
+func uniqueSortedStrings(values []string) []string {
+	sort.Strings(values)
+	result := values[:0]
+	for _, value := range values {
+		if value == "" || len(result) > 0 && result[len(result)-1] == value {
+			continue
+		}
+		result = append(result, value)
+	}
+	return result
+}
+
+func sceneKeysForContext(ctx *MessageContext) []string {
+	keys := make([]string, 0, 3)
+	for _, scope := range []SceneScope{SceneScopeUserChat, SceneScopeChat, SceneScopeUser} {
+		if key, ok := buildSceneKey(scope, ctx); ok {
+			keys = append(keys, key)
+		}
+	}
+	return keys
+}

scene_test.go

@@ -3,7 +3,10 @@ package laniakea
 import (
 	"context"
 	"errors"
+	"sync"
+	"sync/atomic"
 	"testing"
+	"time"
 
 	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 	"git.scuroneko.dev/scuroneko/sneklog/v2"
@@ -41,6 +44,114 @@ func TestPluginAddSceneRegistersScene(t *testing.T) {
 	}
 }
 
+func TestBotAddPluginsSkipsDuplicateSceneNames(t *testing.T) {
+	first := NewPlugin[NoData]("first")
+	first.Scene("shared")
+	second := NewPlugin[NoData]("second")
+	second.Scene("shared")
+
+	bot := &Bot[NoData]{logger: sneklog.NewLogger()}
+	bot.AddPlugins(first, second)
+
+	if _, ok := bot.plugins[0].scenes["shared"]; !ok {
+		t.Fatal("first registered scene was removed")
+	}
+	if _, ok := bot.plugins[1].scenes["shared"]; ok {
+		t.Fatal("duplicate scene was registered")
+	}
+}
+
+func TestSceneUpdatesForSameSessionAreSerialized(t *testing.T) {
+	entered := make(chan int, 2)
+	releaseFirst := make(chan struct{})
+	var calls atomic.Int64
+
+	plugin := NewPlugin[NoData]("wizard")
+	plugin.Scene("counter").
+		SetEntry("start").
+		OnStep("start", func(ctx *SceneContext, db NoData) (SceneResult, error) {
+			var value int
+			if err := ctx.BindData(&value); err != nil {
+				return SceneResult{}, err
+			}
+			call := int(calls.Add(1))
+			entered <- call
+			if call == 1 {
+				<-releaseFirst
+			}
+			value++
+			if err := ctx.SaveData(value); err != nil {
+				return SceneResult{}, err
+			}
+			return ctx.Stay(), nil
+		})
+
+	bot := &Bot[NoData]{
+		logger:             sneklog.NewLogger(),
+		prefixes:           []string{"/"},
+		sessionStore:       NewMemorySessionStore(),
+		sceneScopePriority: []SceneScope{SceneScopeUserChat, SceneScopeChat, SceneScopeUser},
+	}
+	bot.AddPlugins(plugin)
+	key := "user_id:42:chat_id:100"
+	session := SceneSession{Scene: "counter", Step: "start"}
+	if err := session.SaveData(0); err != nil {
+		t.Fatalf("SaveData returned error: %v", err)
+	}
+	if err := bot.sessionStore.Set(key, session); err != nil {
+		t.Fatalf("Set returned error: %v", err)
+	}
+
+	update := func(id int) *tgapi.Update {
+		return &tgapi.Update{
+			UpdateID: id,
+			Type:     tgapi.UpdateTypeMessage,
+			Message: &tgapi.Message{
+				MessageID: id,
+				Text:      "increment",
+				Chat:      &tgapi.Chat{ID: 100, Type: tgapi.ChatTypePrivate},
+				From:      &tgapi.User{ID: 42},
+			},
+		}
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	go func() {
+		defer wg.Done()
+		bot.handle(context.Background(), update(1))
+	}()
+	if got := <-entered; got != 1 {
+		t.Fatalf("first handler call = %d, want 1", got)
+	}
+	go func() {
+		defer wg.Done()
+		bot.handle(context.Background(), update(2))
+	}()
+	select {
+	case call := <-entered:
+		t.Fatalf("second handler entered before first completed: call %d", call)
+	case <-time.After(50 * time.Millisecond):
+	}
+	close(releaseFirst)
+	if got := <-entered; got != 2 {
+		t.Fatalf("second handler call = %d, want 2", got)
+	}
+	wg.Wait()
+
+	got, err := bot.sessionStore.Get(key)
+	if err != nil {
+		t.Fatalf("Get returned error: %v", err)
+	}
+	var value int
+	if err := got.BindData(&value); err != nil {
+		t.Fatalf("BindData returned error: %v", err)
+	}
+	if value != 2 {
+		t.Fatalf("session value = %d, want 2", value)
+	}
+}
+
 func TestBotAddPluginsPreservesScenesAndHandlesThem(t *testing.T) {
 	called := false
 
@@ -836,6 +947,36 @@ func TestSceneMessageFallbackRunsWhenNoCommandOrStepMatch(t *testing.T) {
 	}
 }
 
+func TestMemorySessionStoreDoesNotAliasSessionData(t *testing.T) {
+	store := NewMemorySessionStore()
+	input := []byte("initial")
+	session := SceneSession{Scene: "signup"}
+	session.SetData(input)
+
+	input[0] = 'X'
+	if got := string(session.GetData()); got != "initial" {
+		t.Fatalf("SetData retained caller slice: got %q", got)
+	}
+	if err := store.Set("user:1", session); err != nil {
+		t.Fatalf("Set returned error: %v", err)
+	}
+
+	first, err := store.Get("user:1")
+	if err != nil {
+		t.Fatalf("Get returned error: %v", err)
+	}
+	data := first.GetData()
+	data[0] = 'X'
+
+	second, err := store.Get("user:1")
+	if err != nil {
+		t.Fatalf("second Get returned error: %v", err)
+	}
+	if got := string(second.GetData()); got != "initial" {
+		t.Fatalf("Get exposed stored data for mutation: got %q", got)
+	}
+}
+
 func TestFindSceneSessionSupportsUserScopeWithoutMessage(t *testing.T) {
 	bot := &Bot[NoData]{
 		logger:             sneklog.NewLogger(),

tgapi/api.go

@@ -236,7 +236,7 @@ func (r TelegramRequest[R, P]) doRequest(ctx context.Context, api *API) (R, erro
 		req.Body = io.NopCloser(buf)
 		req.ContentLength = int64(len(reqData))
 
-		api.logger.Debugln("REQ", url, string(reqData))
+		api.logger.Debugln("REQ", url, redactRequestLog(reqData))
 		resp, err := api.client.Do(req)
 		if err != nil {
 			return zero, fmt.Errorf("HTTP request failed: %w", err)
@@ -248,7 +248,7 @@ func (r TelegramRequest[R, P]) doRequest(ctx context.Context, api *API) (R, erro
 			return zero, fmt.Errorf("failed to read response body: %w", err)
 		}
 
-		api.logger.Debugln("RES", r.method, string(respData))
+		api.logger.Debugln("RES", responseLogSummary(r.method, len(respData)))
 
 		response, err := parseBody[R](respData)
 		if err != nil {
@@ -269,7 +269,7 @@ func (r TelegramRequest[R, P]) doRequest(ctx context.Context, api *API) (R, erro
 
 				// Apply cooldown to global or chat-specific limiter
 				if api.Limiter != nil {
-					if r.chatID > 0 {
+					if r.chatID != 0 {
 						api.Limiter.SetChatLock(r.chatID, after)
 					} else {
 						api.Limiter.SetGlobalLock(after)

tgapi/api101_test.go

@@ -0,0 +1,209 @@
+package tgapi
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+)
+
+func TestEditMessageTextMarshalsInputRichMessage(t *testing.T) {
+	params := EditMessageText{
+		ChatID:    1,
+		MessageID: 2,
+		RichMessage: &InputRichMessage{
+			HTML:                "<p>hi</p>",
+			SkipEntityDetection: true,
+		},
+	}
+	data, err := json.Marshal(params)
+	if err != nil {
+		t.Fatalf("Marshal returned error: %v", err)
+	}
+	got := string(data)
+	for _, want := range []string{`"rich_message":{"html":`, `"skip_entity_detection":true`} {
+		if !strings.Contains(got, want) {
+			t.Fatalf("missing %s in editMessageText JSON: %s", want, got)
+		}
+	}
+	if strings.Contains(got, `"blocks"`) {
+		t.Fatalf("rich_message must be an InputRichMessage, not a block tree: %s", got)
+	}
+	if strings.Contains(got, `"text"`) {
+		t.Fatalf("empty text must be omitted when editing rich content: %s", got)
+	}
+}
+
+func TestSendRichMessageDraftMarshal(t *testing.T) {
+	params := SendRichMessageDraft{
+		ChatID:      1,
+		DraftID:     7,
+		RichMessage: InputRichMessage{Markdown: "*hi*"},
+	}
+	data, err := json.Marshal(params)
+	if err != nil {
+		t.Fatalf("Marshal returned error: %v", err)
+	}
+	got := string(data)
+	for _, want := range []string{`"chat_id":1`, `"draft_id":7`, `"rich_message":{"markdown":"*hi*"}`} {
+		if !strings.Contains(got, want) {
+			t.Fatalf("missing %s in sendRichMessageDraft JSON: %s", want, got)
+		}
+	}
+}
+
+func TestInputRichMessageContentMarshal(t *testing.T) {
+	content := InputRichMessageContent{
+		RichMessage: InputRichMessage{HTML: "<p>hi</p>"},
+	}
+	data, err := json.Marshal(content)
+	if err != nil {
+		t.Fatalf("Marshal returned error: %v", err)
+	}
+	if got := string(data); !strings.Contains(got, `"rich_message":{"html":`) {
+		t.Fatalf("unexpected InputRichMessageContent JSON: %s", got)
+	}
+}
+
+func TestInputRichMessageMediaMarshal(t *testing.T) {
+	message := InputRichMessage{
+		HTML: `<video src="tg://video?id=intro"></video>`,
+		Media: []InputRichMessageMedia{{
+			ID:    "intro",
+			Media: InputMedia{Type: InputMediaTypeVideo, Media: "attach://intro"},
+		}},
+	}
+	data, err := json.Marshal(message)
+	if err != nil {
+		t.Fatalf("Marshal returned error: %v", err)
+	}
+
+	var got struct {
+		Media []struct {
+			ID    string     `json:"id"`
+			Media InputMedia `json:"media"`
+		} `json:"media"`
+	}
+	if err := json.Unmarshal(data, &got); err != nil {
+		t.Fatalf("Unmarshal returned error: %v", err)
+	}
+	if len(got.Media) != 1 || got.Media[0].ID != "intro" {
+		t.Fatalf("unexpected media: %+v", got.Media)
+	}
+	if got.Media[0].Media.Type != InputMediaTypeVideo || got.Media[0].Media.Media != "attach://intro" {
+		t.Fatalf("unexpected embedded media: %+v", got.Media[0].Media)
+	}
+}
+
+func TestEphemeralMethodsMarshalReceiverUserID(t *testing.T) {
+	cases := []struct {
+		name   string
+		params any
+	}{
+		{"edit text", EditEphemeralMessageText{ChatID: 1, ReceiverUserID: 2, EphemeralMessageID: 3, Text: "updated"}},
+		{"edit media", EditEphemeralMessageMedia{ChatID: 1, ReceiverUserID: 2, EphemeralMessageID: 3, Media: InputMedia{Type: InputMediaTypePhoto, Media: "photo-id"}}},
+		{"edit caption", EditEphemeralMessageCaption{ChatID: 1, ReceiverUserID: 2, EphemeralMessageID: 3, Caption: "updated"}},
+		{"edit markup", EditEphemeralMessageReplyMarkup{ChatID: 1, ReceiverUserID: 2, EphemeralMessageID: 3}},
+		{"delete", DeleteEphemeralMessage{ChatID: 1, ReceiverUserID: 2, EphemeralMessageID: 3}},
+	}
+
+	for _, tt := range cases {
+		t.Run(tt.name, func(t *testing.T) {
+			data, err := json.Marshal(tt.params)
+			if err != nil {
+				t.Fatalf("Marshal returned error: %v", err)
+			}
+			var fields map[string]json.RawMessage
+			if err := json.Unmarshal(data, &fields); err != nil {
+				t.Fatalf("Unmarshal returned error: %v", err)
+			}
+			if _, ok := fields["receiver_user_id"]; !ok {
+				t.Fatalf("receiver_user_id is missing from %s", data)
+			}
+			if _, ok := fields["reciever_user_id"]; ok {
+				t.Fatalf("misspelled receiver_user_id is present in %s", data)
+			}
+		})
+	}
+}
+
+func TestEphemeralSendParametersMarshal(t *testing.T) {
+	cases := []struct {
+		name   string
+		params any
+	}{
+		{"message", SendMessage{ChatID: 1, Text: "text", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"animation", SendAnimation{ChatID: 1, Animation: "animation", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"audio", SendAudio{ChatID: 1, Audio: "audio", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"document", SendDocument{ChatID: 1, Document: "document", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"photo", SendPhoto{ChatID: 1, Photo: "photo", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"sticker", SendSticker{ChatID: 1, Sticker: "sticker", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"video", SendVideo{ChatID: 1, Video: "video", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"video note", SendVideoNote{ChatID: 1, VideoNote: "video-note", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"voice", SendVoice{ChatID: 1, Voice: "voice", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"contact", SendContact{ChatID: 1, PhoneNumber: "+10000000000", FirstName: "A", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"location", SendLocation{ChatID: 1, Latitude: 1, Longitude: 2, ReceiverUserID: 2, CallbackQueryID: "callback"}},
+		{"venue", SendVenue{ChatID: 1, Latitude: 1, Longitude: 2, Title: "Venue", Address: "Address", ReceiverUserID: 2, CallbackQueryID: "callback"}},
+	}
+
+	for _, tt := range cases {
+		t.Run(tt.name, func(t *testing.T) {
+			data, err := json.Marshal(tt.params)
+			if err != nil {
+				t.Fatalf("Marshal returned error: %v", err)
+			}
+			if !strings.Contains(string(data), `"receiver_user_id":2`) || !strings.Contains(string(data), `"callback_query_id":"callback"`) {
+				t.Fatalf("missing ephemeral parameters in %s", data)
+			}
+		})
+	}
+}
+
+func TestInputPollOptionMediaLinkMarshal(t *testing.T) {
+	media := InputPollOptionMedia{Type: "link", URL: "https://example.com"}
+	data, err := json.Marshal(media)
+	if err != nil {
+		t.Fatalf("Marshal returned error: %v", err)
+	}
+	got := string(data)
+	if got != `{"type":"link","url":"https://example.com"}` {
+		t.Fatalf("unexpected link media JSON: %s", got)
+	}
+}
+
+func TestPollMediaUnmarshalLink(t *testing.T) {
+	var media PollMedia
+	if err := json.Unmarshal([]byte(`{"link":{"url":"https://example.com"}}`), &media); err != nil {
+		t.Fatalf("Unmarshal returned error: %v", err)
+	}
+	if media.Link == nil || media.Link.URL != "https://example.com" {
+		t.Fatalf("unexpected poll media link: %+v", media.Link)
+	}
+}
+
+func TestChatJoinRequestUnmarshalQueryID(t *testing.T) {
+	payload := `{"chat":{"id":1},"from":{"id":2,"first_name":"A"},"user_chat_id":2,"date":3,"query_id":"q42"}`
+	var req ChatJoinRequest
+	if err := json.Unmarshal([]byte(payload), &req); err != nil {
+		t.Fatalf("Unmarshal returned error: %v", err)
+	}
+	if req.QueryID == nil || *req.QueryID != "q42" {
+		t.Fatalf("unexpected query_id: %+v", req.QueryID)
+	}
+}
+
+func TestAnswerChatJoinRequestQueryResultValues(t *testing.T) {
+	if JoinRequestApprove != "approve" || JoinRequestDecline != "decline" || JoinRequestQueue != "queue" {
+		t.Fatalf("unexpected join request query result values: %q %q %q",
+			JoinRequestApprove, JoinRequestDecline, JoinRequestQueue)
+	}
+}
+
+func TestUserUnmarshalSupportsJoinRequestQueries(t *testing.T) {
+	var user User
+	if err := json.Unmarshal([]byte(`{"id":1,"first_name":"A","supports_join_request_queries":true}`), &user); err != nil {
+		t.Fatalf("Unmarshal returned error: %v", err)
+	}
+	if user.SupportsJoinRequestQueries == nil || !*user.SupportsJoinRequestQueries {
+		t.Fatalf("unexpected supports_join_request_queries: %+v", user.SupportsJoinRequestQueries)
+	}
+}

tgapi/attachments_methods.go

@@ -10,6 +10,10 @@ type SendPhoto struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Photo           string          `json:"photo"`
 	Caption         string          `json:"caption,omitempty"`
@@ -53,6 +57,10 @@ type SendAudio struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Audio           string          `json:"audio"`
 	Caption         string          `json:"caption,omitempty"`
@@ -98,6 +106,10 @@ type SendDocument struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Document                    string          `json:"document"`
 	Thumbnail                   string          `json:"thumbnail,omitempty"`
@@ -141,6 +153,10 @@ type SendVideo struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Video     string `json:"video"`
 	Thumbnail string `json:"thumbnail,omitempty"`
@@ -192,6 +208,10 @@ type SendAnimation struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Animation string `json:"animation"`
 	Thumbnail string `json:"thumbnail,omitempty"`
@@ -239,6 +259,10 @@ type SendVoice struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Voice               string          `json:"voice"`
 	Caption             string          `json:"caption,omitempty"`
@@ -280,6 +304,10 @@ type SendVideoNote struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	VideoNote           string `json:"video_note"`
 	Thumbnail           string `json:"thumbnail,omitempty"`
@@ -397,7 +425,13 @@ type SendLivePhoto struct {
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
 
-	LivePhoto       string          `json:"live_photo"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
+	LivePhoto       string `json:"live_photo"`
+	// Photo contains or identifies the associated photo.
+	Photo           string          `json:"photo"`
 	Caption         string          `json:"caption,omitempty"`
 	ParseMode       ParseMode       `json:"parse_mode,omitempty"`
 	CaptionEntities []MessageEntity `json:"caption_entities,omitempty"`

tgapi/attachments_types.go

@@ -112,9 +112,13 @@ type PaidMediaInfo struct {
 type PaidMediaType string
 
 const (
-	PaidMediaPreviewType   PaidMediaType = "preview"
-	PaidMediaPhotoType     PaidMediaType = "photo"
-	PaidMediaVideoType     PaidMediaType = "video"
+	// PaidMediaPreviewType identifies a paid-media preview.
+	PaidMediaPreviewType PaidMediaType = "preview"
+	// PaidMediaPhotoType identifies a paid photo.
+	PaidMediaPhotoType PaidMediaType = "photo"
+	// PaidMediaVideoType identifies a paid video.
+	PaidMediaVideoType PaidMediaType = "video"
+	// PaidMediaLivePhotoType identifies a paid live photo.
 	PaidMediaLivePhotoType PaidMediaType = "live_photo" // Since: Bot API 10.0
 )
 
@@ -166,11 +170,14 @@ type PollOption struct {
 }
 
 // InputPollOptionMedia describes the media to attach to a poll option.
+// For type "link" set URL instead of Media.
 // Since: Bot API 10.0
 // See https://core.telegram.org/bots/api#inputpolloptionmedia
 type InputPollOptionMedia struct {
 	Type  string `json:"type"`
-	Media string `json:"media"`
+	Media string `json:"media,omitempty"`
+	// URL contains the HTTP URL.
+	URL string `json:"url,omitempty"` // Since: Bot API 10.1; for type "link"
 }
 
 // InputPollOption contains information about one answer option in a poll to be sent.
@@ -224,8 +231,8 @@ const (
 // See https://core.telegram.org/bots/api#pollanswer
 type PollAnswer struct {
 	PollID              string   `json:"poll_id"`
-	VoterChat           Chat     `json:"voter_chat"` // Since: Bot API 6.8
-	User                User     `json:"user"`
+	VoterChat           Chat     `json:"voter_chat,omitempty"` // Since: Bot API 6.8
+	User                User     `json:"user,omitempty"`       // FIXME: Pointer in v2
 	OptionIDs           []int    `json:"option_ids"`
 	OptionPersistentIDs []string `json:"option_persistent_ids"` // Since: Bot API 9.6
 }
@@ -258,12 +265,22 @@ type Poll struct {
 	Media                 *PollMedia      `json:"media,omitempty"`                   // Since: Bot API 10.0
 }
 
+// Link represents an HTTP link.
+// Since: Bot API 10.1
+// See https://core.telegram.org/bots/api#link
+type Link struct {
+	// URL contains the HTTP URL.
+	URL string `json:"url"`
+}
+
 // PollMedia represents media attached to a poll.
 // Since: Bot API 10.0
 type PollMedia struct {
-	Animation *Animation  `json:"animation,omitempty"`
-	Audio     *Audio      `json:"audio,omitempty"`
-	Document  *Document   `json:"document,omitempty"`
+	Animation *Animation `json:"animation,omitempty"`
+	Audio     *Audio     `json:"audio,omitempty"`
+	Document  *Document  `json:"document,omitempty"`
+	// Link contains link media attached to the poll.
+	Link      *Link       `json:"link,omitempty"` // Since: Bot API 10.1
 	LivePhoto *LivePhoto  `json:"live_photo,omitempty"`
 	Location  *Location   `json:"location,omitempty"`
 	Photo     []PhotoSize `json:"photo,omitempty"`
@@ -342,10 +359,18 @@ const (
 	InputMediaTypeVideo InputMediaType = "video"
 	// InputMediaTypeAudio is an audio file.
 	InputMediaTypeAudio InputMediaType = "audio"
+	// InputMediaTypeVoiceNote is a voice message.
+	//
+	// Since: Bot API 10.2
+	InputMediaTypeVoiceNote InputMediaType = "voice_note"
 
-	InputMediaTypeSticker   InputMediaType = "sticker"
-	InputMediaTypeLocation  InputMediaType = "location"
-	InputMediaTypeVenue     InputMediaType = "venue"
+	// InputMediaTypeSticker is a sticker.
+	InputMediaTypeSticker InputMediaType = "sticker"
+	// InputMediaTypeLocation is a location.
+	InputMediaTypeLocation InputMediaType = "location"
+	// InputMediaTypeVenue is a venue.
+	InputMediaTypeVenue InputMediaType = "venue"
+	// InputMediaTypeLivePhoto is a live photo.
 	InputMediaTypeLivePhoto InputMediaType = "live_photo" // Since: Bot API 10.0
 )
 

tgapi/bot_types.go

@@ -6,6 +6,8 @@ package tgapi
 type BotCommand struct {
 	Command     string `json:"command"`
 	Description string `json:"description"`
+	// IsEphemeral marks the command as visible only in ephemeral command contexts.
+	IsEphemeral bool `json:"is_ephemeral,omitempty"` // Since: Bot API 10.2
 }
 
 // BotCommandScopeType indicates the type of a command scope.

tgapi/chat_methods.go

@@ -481,6 +481,77 @@ func (api *API) DeclineChatJoinRequestWithContext(ctx context.Context, params De
 	return req.DoWithContext(ctx, api)
 }
 
+// ChatJoinRequestQueryResult is the verdict passed to answerChatJoinRequestQuery.
+// Since: Bot API 10.1
+type ChatJoinRequestQueryResult string
+
+const (
+	// JoinRequestApprove allows the user to join the chat.
+	JoinRequestApprove ChatJoinRequestQueryResult = "approve"
+	// JoinRequestDecline disallows the user to join the chat.
+	JoinRequestDecline ChatJoinRequestQueryResult = "decline"
+	// JoinRequestQueue leaves the decision to other administrators.
+	JoinRequestQueue ChatJoinRequestQueryResult = "queue"
+)
+
+// AnswerChatJoinRequestQuery holds parameters for the answerChatJoinRequestQuery method.
+// Since: Bot API 10.1
+// See https://core.telegram.org/bots/api#answerchatjoinrequestquery
+type AnswerChatJoinRequestQuery struct {
+	// ChatJoinRequestQueryID identifies the chat join request query.
+	ChatJoinRequestQueryID string `json:"chat_join_request_query_id"`
+	// Result contains the decision for the join request query.
+	Result ChatJoinRequestQueryResult `json:"result"`
+}
+
+// AnswerChatJoinRequestQuery processes a received chat join request query.
+// Since: Bot API 10.1
+// Returns True on success.
+// See https://core.telegram.org/bots/api#answerchatjoinrequestquery
+func (api *API) AnswerChatJoinRequestQuery(params AnswerChatJoinRequestQuery) (bool, error) {
+	req := NewRequest[bool]("answerChatJoinRequestQuery", params)
+	return req.Do(api)
+}
+
+// AnswerChatJoinRequestQueryWithContext is the context-aware variant of AnswerChatJoinRequestQuery.
+// Since: Bot API 10.1
+// It executes the same request but uses ctx for cancellation and deadlines.
+// See https://core.telegram.org/bots/api#answerchatjoinrequestquery
+func (api *API) AnswerChatJoinRequestQueryWithContext(ctx context.Context, params AnswerChatJoinRequestQuery) (bool, error) {
+	req := NewRequest[bool]("answerChatJoinRequestQuery", params)
+	return req.DoWithContext(ctx, api)
+}
+
+// SendChatJoinRequestWebApp holds parameters for the sendChatJoinRequestWebApp method.
+// Since: Bot API 10.1
+// See https://core.telegram.org/bots/api#sendchatjoinrequestwebapp
+type SendChatJoinRequestWebApp struct {
+	// ChatJoinRequestQueryID identifies the chat join request query.
+	ChatJoinRequestQueryID string `json:"chat_join_request_query_id"`
+	// WebAppURL is the HTTPS URL of the Mini App to open.
+	WebAppURL string `json:"web_app_url"`
+}
+
+// SendChatJoinRequestWebApp shows a Mini App to the user before deciding a
+// join request query; resolve the query with AnswerChatJoinRequestQuery based
+// on the Mini App interaction.
+// Since: Bot API 10.1
+// Returns True on success.
+// See https://core.telegram.org/bots/api#sendchatjoinrequestwebapp
+func (api *API) SendChatJoinRequestWebApp(params SendChatJoinRequestWebApp) (bool, error) {
+	req := NewRequest[bool]("sendChatJoinRequestWebApp", params)
+	return req.Do(api)
+}
+
+// SendChatJoinRequestWebAppWithContext is the context-aware variant of SendChatJoinRequestWebApp.
+// Since: Bot API 10.1
+// It executes the same request but uses ctx for cancellation and deadlines.
+// See https://core.telegram.org/bots/api#sendchatjoinrequestwebapp
+func (api *API) SendChatJoinRequestWebAppWithContext(ctx context.Context, params SendChatJoinRequestWebApp) (bool, error) {
+	req := NewRequest[bool]("sendChatJoinRequestWebApp", params)
+	return req.DoWithContext(ctx, api)
+}
+
 // SetChatPhoto holds parameters for the setChatPhoto method.
 // Since: Bot API 3.1
 // See https://core.telegram.org/bots/api#setchatphoto

tgapi/chat_types.go

@@ -91,6 +91,10 @@ type ChatFullInfo struct {
 	FirstProfileAudio    *Audio            `json:"first_profile_audio,omitempty"`     // Since: Bot API 9.4
 	UniqueGiftColors     *UniqueGiftColors `json:"unique_gift_colors,omitempty"`      // Since: Bot API 9.3
 	PaidMessageStarCount *int              `json:"paid_message_star_count,omitempty"` // Since: Bot API 9.3
+	// GuardBot contains the guard bot visible to chat administrators.
+	GuardBot *User `json:"guard_bot,omitempty"` // Since: Bot API 10.1; visible to chat administrators only
+	// Community contains information about the affected community.
+	Community *Community `json:"community,omitempty"` // Since: Bot API 10.2
 }
 
 // ChatPhoto represents a chat photo.
@@ -317,3 +321,26 @@ type ChatBoostRemoved struct {
 	RemoveDate int             `json:"remove_date"`
 	Source     ChatBoostSource `json:"source"`
 }
+
+// Community represents a group of chats.
+//
+// Since: Bot API 10.2
+type Community struct {
+	// ID uniquely identifies the value within its containing object.
+	ID int64 `json:"id"`
+	// Name is the user-facing or reference name of the value.
+	Name string `json:"name"`
+}
+
+// CommunityChatAdded describes a service message about a chat joining a community.
+//
+// Since: Bot API 10.2
+type CommunityChatAdded struct {
+	// Community contains information about the affected community.
+	Community Community `json:"community"`
+}
+
+// CommunityChatRemoved describes a service message about a chat leaving a community.
+//
+// Since: Bot API 10.2
+type CommunityChatRemoved struct{}

tgapi/errors.go

@@ -14,6 +14,11 @@ var ErrPoolQueueFull = errors.New("worker pool queue full")
 // ErrPoolStopped reports that a request was submitted after the worker pool stopped.
 var ErrPoolStopped = errors.New("worker pool stopped")
 
+// ErrRichMessageDraftUploadUnsupported reports a direct file upload attempted for a rich draft.
+//
+// Since: Bot API 10.2
+var ErrRichMessageDraftUploadUnsupported = errors.New("sendRichMessageDraft does not support direct file uploads")
+
 // ResponseError reports an unsuccessful Telegram API response.
 type ResponseError struct {
 	Code        int

tgapi/inline_types.go

@@ -14,6 +14,16 @@ type InlineQueryResultsButton struct {
 	StartParameter string      `json:"start_parameter,omitempty"`
 }
 
+// InputRichMessageContent represents the content of a rich message to be
+// sent as the result of an inline query. Use it as the input_message_content
+// value of an InlineQueryResult.
+// Since: Bot API 10.1
+// See https://core.telegram.org/bots/api#inputrichmessagecontent
+type InputRichMessageContent struct {
+	// RichMessage contains structured rich-message content.
+	RichMessage InputRichMessage `json:"rich_message"`
+}
+
 // SentWebAppMessage describes an inline message sent by a Web App on behalf of a user.
 // Since: Bot API 8.0
 // See https://core.telegram.org/bots/api#sentwebappmessage

tgapi/log_redaction.go

@@ -0,0 +1,57 @@
+package tgapi
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+const redactedLogValue = "<REDACTED>"
+
+var sensitiveLogFields = map[string]struct{}{
+	"callback_data":    {},
+	"credentials":      {},
+	"data":             {},
+	"invoice_payload":  {},
+	"payload":          {},
+	"provider_data":    {},
+	"provider_token":   {},
+	"secret":           {},
+	"secret_token":     {},
+	"token":            {},
+	"web_app_query_id": {},
+}
+
+func redactRequestLog(data []byte) string {
+	var value any
+	if err := json.Unmarshal(data, &value); err != nil {
+		return fmt.Sprintf("<invalid JSON omitted: %d bytes>", len(data))
+	}
+	redactLogValue(value)
+	redacted, err := json.Marshal(value)
+	if err != nil {
+		return fmt.Sprintf("<unavailable JSON omitted: %d bytes>", len(data))
+	}
+	return string(redacted)
+}
+
+func redactLogValue(value any) {
+	switch value := value.(type) {
+	case map[string]any:
+		for key, item := range value {
+			if _, sensitive := sensitiveLogFields[strings.ToLower(key)]; sensitive {
+				value[key] = redactedLogValue
+				continue
+			}
+			redactLogValue(item)
+		}
+	case []any:
+		for _, item := range value {
+			redactLogValue(item)
+		}
+	}
+}
+
+func responseLogSummary(method string, size int) string {
+	return fmt.Sprintf("method=%s bytes=%d body=omitted", method, size)
+}

tgapi/log_redaction_test.go

@@ -0,0 +1,39 @@
+package tgapi
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestRedactRequestLogRemovesSensitiveValues(t *testing.T) {
+	const input = `{"secret_token":"webhook-secret","provider_token":"payment-token","nested":{"data":"passport-data","callback_data":"callback-secret"},"chat_id":42}`
+	got := redactRequestLog([]byte(input))
+
+	for _, secret := range []string{"webhook-secret", "payment-token", "passport-data", "callback-secret"} {
+		if strings.Contains(got, secret) {
+			t.Errorf("redacted request contains %q: %s", secret, got)
+		}
+	}
+	if !strings.Contains(got, `"chat_id":42`) {
+		t.Errorf("redacted request lost non-sensitive field: %s", got)
+	}
+}
+
+func TestRedactRequestLogOmitsInvalidJSON(t *testing.T) {
+	const secret = "not-json-secret"
+	got := redactRequestLog([]byte(secret))
+	if strings.Contains(got, secret) {
+		t.Fatalf("invalid JSON was logged verbatim: %s", got)
+	}
+}
+
+func TestResponseLogSummaryNeverContainsBody(t *testing.T) {
+	const token = "managed-bot-token"
+	got := responseLogSummary("getManagedBotToken", len(token))
+	if strings.Contains(got, token) {
+		t.Fatalf("response summary contains response body: %s", got)
+	}
+	if !strings.Contains(got, "body=omitted") {
+		t.Fatalf("response summary does not explain omission: %s", got)
+	}
+}

tgapi/messages_methods.go

@@ -10,6 +10,10 @@ type SendMessage struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int64  `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Text                 string              `json:"text"`
 	ParseMode            ParseMode           `json:"parse_mode,omitempty"`
@@ -29,7 +33,7 @@ type SendMessage struct {
 // Since: Bot API 1.0
 // See https://core.telegram.org/bots/api#sendmessage
 func (api *API) SendMessage(params SendMessage) (Message, error) {
-	req := NewRequestWithChatID[Message, SendMessage]("sendMessage", params, params.ChatID)
+	req := NewRequestWithChatID[Message]("sendMessage", params, params.ChatID)
 	return req.Do(api)
 }
 
@@ -38,7 +42,7 @@ func (api *API) SendMessage(params SendMessage) (Message, error) {
 // It executes the same request but uses ctx for cancellation and deadlines.
 // See https://core.telegram.org/bots/api#sendmessage
 func (api *API) SendMessageWithContext(ctx context.Context, params SendMessage) (Message, error) {
-	req := NewRequestWithChatID[Message, SendMessage]("sendMessage", params, params.ChatID)
+	req := NewRequestWithChatID[Message]("sendMessage", params, params.ChatID)
 	return req.DoWithContext(ctx, api)
 }
 
@@ -200,6 +204,10 @@ type SendLocation struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Latitude             float64 `json:"latitude"`
 	Longitude            float64 `json:"longitude"`
@@ -243,6 +251,10 @@ type SendVenue struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Latitude        float64 `json:"latitude"`
 	Longitude       float64 `json:"longitude"`
@@ -288,6 +300,10 @@ type SendContact struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	PhoneNumber string `json:"phone_number"`
 	FirstName   string `json:"first_name"`
@@ -547,11 +563,13 @@ type EditMessageText struct {
 	ChatID               int64               `json:"chat_id,omitempty"`
 	MessageID            int                 `json:"message_id,omitempty"`
 	InlineMessageID      string              `json:"inline_message_id,omitempty"`
-	Text                 string              `json:"text"`
+	Text                 string              `json:"text,omitempty"` // required unless RichMessage is set
 	ParseMode            ParseMode           `json:"parse_mode,omitempty"`
 	Entities             []MessageEntity     `json:"entities,omitempty"`
 	LinkPreviewOptions   *LinkPreviewOptions `json:"link_preview_options,omitempty"`
-	ReplyMarkup          *ReplyMarkup        `json:"reply_markup,omitempty"`
+	// RichMessage contains structured rich-message content.
+	RichMessage *InputRichMessage `json:"rich_message,omitempty"` // Since: Bot API 10.1; required if Text is not specified
+	ReplyMarkup *ReplyMarkup      `json:"reply_markup,omitempty"`
 }
 
 // EditMessageText edits text messages.
@@ -1089,3 +1107,253 @@ func (api *API) DeleteMessageReactionWithContext(ctx context.Context, params Del
 	req := NewRequest[bool]("deleteMessageReaction", params)
 	return req.DoWithContext(ctx, api)
 }
+
+// SendRichMessage holds parameters for the sendRichMessage method.
+// Since: Bot API 10.1
+// See https://core.telegram.org/bots/api#sendrichmessage
+type SendRichMessage struct {
+	// BusinessConnectionID identifies the business connection used to send the message.
+	BusinessConnectionID string `json:"business_connection_id,omitempty"`
+	// ChatID identifies the target chat.
+	ChatID int64 `json:"chat_id"`
+	// MessageThreadID identifies the target message thread.
+	MessageThreadID int64 `json:"message_thread_id,omitempty"`
+	// DirectMessagesTopicID identifies the target direct-messages topic.
+	DirectMessagesTopicID int64 `json:"direct_messages_topic_id,omitempty"`
+
+	// RichMessage contains structured rich-message content.
+	RichMessage InputRichMessage `json:"rich_message"`
+	// DisableNotification requests delivery without a notification sound.
+	DisableNotification bool `json:"disable_notification,omitempty"`
+	// ProtectContent prevents forwarding and saving the sent content.
+	ProtectContent bool `json:"protect_content,omitempty"`
+	// AllowPaidBroadcast permits high-throughput delivery using paid broadcast capacity.
+	AllowPaidBroadcast bool `json:"allow_paid_broadcast,omitempty"`
+	// MessageEffectID identifies the message effect to apply.
+	MessageEffectID string `json:"message_effect_id,omitempty"`
+	// SuggestedPostParameters contains parameters for a suggested channel post.
+	SuggestedPostParameters *SuggestedPostParameters `json:"suggested_post_parameters,omitempty"`
+	// ReplyParameters describes the message being replied to.
+	ReplyParameters *ReplyParameters `json:"reply_parameters,omitempty"`
+	// ReplyMarkup defines the message's inline keyboard.
+	ReplyMarkup *ReplyMarkup `json:"reply_markup,omitempty"`
+}
+
+// SendRichMessage sends a rich formatted message.
+// Since: Bot API 10.1
+// See https://core.telegram.org/bots/api#sendrichmessage
+func (api *API) SendRichMessage(params SendRichMessage) (Message, error) {
+	req := NewRequestWithChatID[Message]("sendRichMessage", params, params.ChatID)
+	return req.Do(api)
+}
+
+// SendRichMessageWithContext is the context-aware variant of SendRichMessage.
+// Since: Bot API 10.1
+// It executes the same request but uses ctx for cancellation and deadlines.
+// See https://core.telegram.org/bots/api#sendrichmessage
+func (api *API) SendRichMessageWithContext(ctx context.Context, params SendRichMessage) (Message, error) {
+	req := NewRequestWithChatID[Message]("sendRichMessage", params, params.ChatID)
+	return req.DoWithContext(ctx, api)
+}
+
+// SendRichMessageDraft holds parameters for the sendRichMessageDraft method.
+// Since: Bot API 10.1
+// See https://core.telegram.org/bots/api#sendrichmessagedraft
+type SendRichMessageDraft struct {
+	// ChatID identifies the target chat.
+	ChatID int64 `json:"chat_id"`
+	// MessageThreadID identifies the target message thread.
+	MessageThreadID int64 `json:"message_thread_id,omitempty"`
+
+	// DraftID must be non-zero; changes to drafts with the same identifier are animated.
+	DraftID int64 `json:"draft_id"`
+	// RichMessage contains structured rich-message content.
+	RichMessage InputRichMessage `json:"rich_message"`
+}
+
+// SendRichMessageDraft streams a partial rich message to a private chat while
+// the message is being generated. The draft is an ephemeral ~30-second
+// preview; call SendRichMessage with the complete message to persist it.
+// Since: Bot API 10.1
+// Returns True on success.
+// See https://core.telegram.org/bots/api#sendrichmessagedraft
+func (api *API) SendRichMessageDraft(params SendRichMessageDraft) (bool, error) {
+	req := NewRequestWithChatID[bool]("sendRichMessageDraft", params, params.ChatID)
+	return req.Do(api)
+}
+
+// SendRichMessageDraftWithContext is the context-aware variant of SendRichMessageDraft.
+// Since: Bot API 10.1
+// It executes the same request but uses ctx for cancellation and deadlines.
+// See https://core.telegram.org/bots/api#sendrichmessagedraft
+func (api *API) SendRichMessageDraftWithContext(ctx context.Context, params SendRichMessageDraft) (bool, error) {
+	req := NewRequestWithChatID[bool]("sendRichMessageDraft", params, params.ChatID)
+	return req.DoWithContext(ctx, api)
+}
+
+// EditEphemeralMessageText holds parameters for editing an ephemeral text message.
+//
+// Since: Bot API 10.2
+type EditEphemeralMessageText struct {
+	// ChatID identifies the target chat.
+	ChatID int64 `json:"chat_id"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id"`
+	// EphemeralMessageID identifies the ephemeral message.
+	EphemeralMessageID int64 `json:"ephemeral_message_id"`
+	// Text contains the formatted or plain text content.
+	Text string `json:"text"`
+
+	// ParseMode selects the formatting syntax used by the text or caption.
+	ParseMode ParseMode `json:"parse_mode,omitempty"`
+	// Entities describes explicit formatting entities in Text.
+	Entities []MessageEntity `json:"entities,omitempty"`
+	// LinkPreviewOptions controls link preview generation for Text.
+	LinkPreviewOptions *LinkPreviewOptions `json:"link_preview_options,omitempty"`
+	// ReplyMarkup defines the message's inline keyboard.
+	ReplyMarkup *InlineKeyboardMarkup `json:"reply_markup,omitempty"`
+}
+
+// EditEphemeralMessageText edits an ephemeral text message.
+//
+// Since: Bot API 10.2
+func (api *API) EditEphemeralMessageText(params EditEphemeralMessageText) (bool, error) {
+	req := NewRequestWithChatID[bool]("editEphemeralMessageText", params, params.ChatID)
+	return req.Do(api)
+}
+
+// EditEphemeralMessageTextWithContext is the context-aware variant of EditEphemeralMessageText.
+//
+// Since: Bot API 10.2
+func (api *API) EditEphemeralMessageTextWithContext(ctx context.Context, params EditEphemeralMessageText) (bool, error) {
+	req := NewRequestWithChatID[bool]("editEphemeralMessageText", params, params.ChatID)
+	return req.DoWithContext(ctx, api)
+}
+
+// EditEphemeralMessageMedia holds parameters for editing ephemeral message media.
+// New files cannot be uploaded; use a file ID or URL.
+//
+// Since: Bot API 10.2
+type EditEphemeralMessageMedia struct {
+	// ChatID identifies the target chat.
+	ChatID int64 `json:"chat_id"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id"`
+	// EphemeralMessageID identifies the ephemeral message.
+	EphemeralMessageID int64 `json:"ephemeral_message_id"`
+	// Media contains or identifies media associated with the value.
+	Media InputMedia `json:"media"`
+	// ReplyMarkup defines the message's inline keyboard.
+	ReplyMarkup *InlineKeyboardMarkup `json:"reply_markup,omitempty"`
+}
+
+// EditEphemeralMessageMedia edits the media of an ephemeral message.
+//
+// Since: Bot API 10.2
+func (api *API) EditEphemeralMessageMedia(params EditEphemeralMessageMedia) (bool, error) {
+	req := NewRequestWithChatID[bool]("editEphemeralMessageMedia", params, params.ChatID)
+	return req.Do(api)
+}
+
+// EditEphemeralMessageMediaWithContext is the context-aware variant of EditEphemeralMessageMedia.
+//
+// Since: Bot API 10.2
+func (api *API) EditEphemeralMessageMediaWithContext(ctx context.Context, params EditEphemeralMessageMedia) (bool, error) {
+	req := NewRequestWithChatID[bool]("editEphemeralMessageMedia", params, params.ChatID)
+	return req.DoWithContext(ctx, api)
+}
+
+// EditEphemeralMessageCaption holds parameters for editing an ephemeral message caption.
+//
+// Since: Bot API 10.2
+type EditEphemeralMessageCaption struct {
+	// ChatID identifies the target chat.
+	ChatID int64 `json:"chat_id"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id"`
+	// EphemeralMessageID identifies the ephemeral message.
+	EphemeralMessageID int64 `json:"ephemeral_message_id"`
+
+	// Caption contains the media or block caption.
+	Caption string `json:"caption,omitempty"`
+	// ParseMode selects the formatting syntax used by the text or caption.
+	ParseMode ParseMode `json:"parse_mode,omitempty"`
+	// CaptionEntities describes formatting entities in Caption.
+	CaptionEntities []MessageEntity `json:"caption_entities,omitempty"`
+	// ReplyMarkup defines the message's inline keyboard.
+	ReplyMarkup *InlineKeyboardMarkup `json:"reply_markup,omitempty"`
+}
+
+// EditEphemeralMessageCaption edits an ephemeral message caption.
+//
+// Since: Bot API 10.2
+func (api *API) EditEphemeralMessageCaption(params EditEphemeralMessageCaption) (bool, error) {
+	req := NewRequestWithChatID[bool]("editEphemeralMessageCaption", params, params.ChatID)
+	return req.Do(api)
+}
+
+// EditEphemeralMessageCaptionWithContext is the context-aware variant of EditEphemeralMessageCaption.
+//
+// Since: Bot API 10.2
+func (api *API) EditEphemeralMessageCaptionWithContext(ctx context.Context, params EditEphemeralMessageCaption) (bool, error) {
+	req := NewRequestWithChatID[bool]("editEphemeralMessageCaption", params, params.ChatID)
+	return req.DoWithContext(ctx, api)
+}
+
+// EditEphemeralMessageReplyMarkup holds parameters for editing an ephemeral message's inline keyboard.
+//
+// Since: Bot API 10.2
+type EditEphemeralMessageReplyMarkup struct {
+	// ChatID identifies the target chat.
+	ChatID int64 `json:"chat_id"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id"`
+	// EphemeralMessageID identifies the ephemeral message.
+	EphemeralMessageID int64 `json:"ephemeral_message_id"`
+	// ReplyMarkup defines the message's inline keyboard.
+	ReplyMarkup *InlineKeyboardMarkup `json:"reply_markup,omitempty"`
+}
+
+// EditEphemeralMessageReplyMarkup edits an ephemeral message's inline keyboard.
+//
+// Since: Bot API 10.2
+func (api *API) EditEphemeralMessageReplyMarkup(params EditEphemeralMessageReplyMarkup) (bool, error) {
+	req := NewRequestWithChatID[bool]("editEphemeralMessageReplyMarkup", params, params.ChatID)
+	return req.Do(api)
+}
+
+// EditEphemeralMessageReplyMarkupWithContext is the context-aware variant of EditEphemeralMessageReplyMarkup.
+//
+// Since: Bot API 10.2
+func (api *API) EditEphemeralMessageReplyMarkupWithContext(ctx context.Context, params EditEphemeralMessageReplyMarkup) (bool, error) {
+	req := NewRequestWithChatID[bool]("editEphemeralMessageReplyMarkup", params, params.ChatID)
+	return req.DoWithContext(ctx, api)
+}
+
+// DeleteEphemeralMessage holds parameters for deleting an ephemeral message.
+//
+// Since: Bot API 10.2
+type DeleteEphemeralMessage struct {
+	// ChatID identifies the target chat.
+	ChatID int64 `json:"chat_id"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id"`
+	// EphemeralMessageID identifies the ephemeral message.
+	EphemeralMessageID int64 `json:"ephemeral_message_id"`
+}
+
+// DeleteEphemeralMessage deletes an ephemeral message.
+//
+// Since: Bot API 10.2
+func (api *API) DeleteEphemeralMessage(params DeleteEphemeralMessage) (bool, error) {
+	req := NewRequestWithChatID[bool]("deleteEphemeralMessage", params, params.ChatID)
+	return req.Do(api)
+}
+
+// DeleteEphemeralMessageWithContext is the context-aware variant of DeleteEphemeralMessage.
+//
+// Since: Bot API 10.2
+func (api *API) DeleteEphemeralMessageWithContext(ctx context.Context, params DeleteEphemeralMessage) (bool, error) {
+	req := NewRequestWithChatID[bool]("deleteEphemeralMessage", params, params.ChatID)
+	return req.DoWithContext(ctx, api)
+}

tgapi/messages_types.go

@@ -23,10 +23,14 @@ type DirectMessageTopic struct {
 type MessageOriginType string
 
 const (
-	MessageOriginUserType       = "user"
+	// MessageOriginUserType identifies a known user origin.
+	MessageOriginUserType = "user"
+	// MessageOriginHiddenUserType identifies a hidden user origin.
 	MessageOriginHiddenUserType = "hidden_user"
-	MessageOriginChatType       = "chat"
-	MessageOriginChannel        = "channel"
+	// MessageOriginChatType identifies a chat origin.
+	MessageOriginChatType = "chat"
+	// MessageOriginChannel identifies a channel origin.
+	MessageOriginChannel = "channel"
 )
 
 // MessageOrigin describes the origin of a message.
@@ -115,10 +119,14 @@ type Message struct {
 	DirectMessageTopic *DirectMessageTopic `json:"direct_message_topic,omitempty"` // Since: Bot API 9.2
 	From               *User               `json:"from,omitempty"`
 
-	SenderChat           *Chat          `json:"sender_chat,omitempty"`         // Since: Bot API 5.0
-	SenderBoostCount     int            `json:"sender_boost_count,omitempty"`  // Since: Bot API 7.1
-	SenderBusinessBot    *User          `json:"sender_business_bot,omitempty"` // Since: Bot API 7.2
-	SenderTag            string         `json:"sender_tag,omitempty"`          // Since: Bot API 9.5
+	SenderChat        *Chat  `json:"sender_chat,omitempty"`         // Since: Bot API 5.0
+	SenderBoostCount  int    `json:"sender_boost_count,omitempty"`  // Since: Bot API 7.1
+	SenderBusinessBot *User  `json:"sender_business_bot,omitempty"` // Since: Bot API 7.2
+	SenderTag         string `json:"sender_tag,omitempty"`          // Since: Bot API 9.5
+	// ReceiverUser identifies the user who can see the ephemeral message.
+	ReceiverUser *User `json:"receiver_user,omitempty"` // Since: Bot API 10.2
+	// EphemeralMessageID identifies the ephemeral message.
+	EphemeralMessageID   int64          `json:"ephemeral_message_id,omitempty"` // Since: Bot API 10.2
 	Date                 int            `json:"date"`
 	GuestQueryID         string         `json:"guest_query_id,omitempty"`         // Since: Bot API 10.0
 	BusinessConnectionID string         `json:"business_connection_id,omitempty"` // Since: Bot API 7.2
@@ -151,7 +159,9 @@ type Message struct {
 	SuggestedPostInfo  *SuggestedPostInfo  `json:"suggested_post_info,omitempty"` // Since: Bot API 9.1
 	EffectID           string              `json:"effect_id,omitempty"`           // Since: Bot API 7.4
 
-	Animation             *Animation               `json:"animation,omitempty"` // Since: Bot API 4.0
+	// RichMessage contains structured rich-message content.
+	RichMessage           *RichMessage             `json:"rich_message,omitempty"` // Since: Bot API 10.1
+	Animation             *Animation               `json:"animation,omitempty"`    // Since: Bot API 4.0
 	Audio                 *Audio                   `json:"audio,omitempty"`
 	Document              *Document                `json:"document,omitempty"`
 	PaidMedia             *PaidMediaInfo           `json:"paid_media,omitempty"` // Since: Bot API 7.6
@@ -205,8 +215,12 @@ type Message struct {
 	BoostAdded              *ChatBoostAdded          `json:"boost_added,omitempty"`               // Since: Bot API 7.1
 	ChatBackgroundSet       *ChatBackground          `json:"chat_background_set,omitempty"`       // Since: Bot API 7.5
 
-	ChecklistTaskDone         *ChecklistTaskDone         `json:"checklist_task_done,omitempty"`          // Since: Bot API 9.1
-	ChecklistTasksAdded       *ChecklistTasksAdded       `json:"checklist_tasks_added,omitempty"`        // Since: Bot API 9.1
+	ChecklistTaskDone   *ChecklistTaskDone   `json:"checklist_task_done,omitempty"`   // Since: Bot API 9.1
+	ChecklistTasksAdded *ChecklistTasksAdded `json:"checklist_tasks_added,omitempty"` // Since: Bot API 9.1
+	// CommunityChatAdded describes a community chat addition service message.
+	CommunityChatAdded *CommunityChatAdded `json:"community_chat_added,omitempty"` // Since: Bot API 10.2
+	// CommunityChatRemoved describes a community chat removal service message.
+	CommunityChatRemoved      *CommunityChatRemoved      `json:"community_chat_removed,omitempty"`       // Since: Bot API 10.2
 	DirectMessagePriceChanged *DirectMessagePriceChanged `json:"direct_message_price_changed,omitempty"` // Since: Bot API 9.1
 	PaidMessagePriceChanged   *PaidMessagePriceChanged   `json:"paid_message_price_changed,omitempty"`   // Since: Bot API 9.x
 	ForumTopicCreated         *ForumTopicCreated         `json:"forum_topic_created,omitempty"`          // Since: Bot API 6.3
@@ -394,8 +408,10 @@ type MessageEntity struct {
 // Since: Bot API 7.0
 // See https://core.telegram.org/bots/api#replyparameters
 type ReplyParameters struct {
-	MessageID int   `json:"message_id"`
+	MessageID int   `json:"message_id,omitempty"`
 	ChatID    int64 `json:"chat_id,omitempty"`
+	// EphemeralMessageID identifies the ephemeral message.
+	EphemeralMessageID int64 `json:"ephemeral_message_id,omitempty"` // Since: Bot API 10.2
 
 	AllowSendingWithoutReply bool            `json:"allow_sending_without_reply,omitempty"`
 	Quote                    string          `json:"quote,omitempty"`
@@ -748,3 +764,40 @@ type VideoChatParticipantsInvited struct {
 type SentGuestMessage struct {
 	InlineMessageID string `json:"inline_message_id"`
 }
+
+// RichMessage represents a received rich-formatted message.
+// Since: Bot API 10.1
+type RichMessage struct {
+	// Blocks contains the nested rich-message blocks.
+	Blocks []RichBlock `json:"blocks"`
+	// IsRTL requests right-to-left rich-message layout.
+	IsRTL bool `json:"is_rtl,omitempty"`
+}
+
+// InputRichMessageMedia describes media embedded in outgoing rich-message HTML or Markdown.
+//
+// Since: Bot API 10.2
+type InputRichMessageMedia struct {
+	// ID uniquely identifies the value within its containing object.
+	ID string `json:"id"`
+	// Media contains or identifies media associated with the value.
+	Media InputMedia `json:"media"`
+}
+
+// InputRichMessage describes a rich message to be sent. Exactly one of HTML, Markdown, or Blocks must be used.
+//
+// Since: Bot API 10.1
+type InputRichMessage struct {
+	// Blocks contains the nested rich-message blocks.
+	Blocks []InputRichBlock `json:"blocks,omitempty"` // Since: Bot API 10.2
+	// HTML contains rich-message content in Telegram HTML syntax.
+	HTML string `json:"html,omitempty"`
+	// Markdown contains rich-message content in Telegram Markdown syntax.
+	Markdown string `json:"markdown,omitempty"`
+	// Media contains or identifies media associated with the value.
+	Media []InputRichMessageMedia `json:"media,omitempty"` // Since: Bot API 10.2
+	// IsRTL requests right-to-left rich-message layout.
+	IsRTL bool `json:"is_rtl,omitempty"`
+	// SkipEntityDetection disables automatic detection of links, mentions, hashtags, commands, phone numbers, and bank cards.
+	SkipEntityDetection bool `json:"skip_entity_detection,omitempty"`
+}

tgapi/methods.go

@@ -79,7 +79,7 @@ func (api *API) ReplaceManagedBotTokenWithContext(ctx context.Context, params Re
 // Returns true on success.
 // See https://core.telegram.org/bots/api#logout
 func (api *API) LogOut() (bool, error) {
-	req := NewRequest[bool, EmptyParams]("logOut", NoParams)
+	req := NewRequest[bool]("logOut", NoParams)
 	return req.Do(api)
 }
 
@@ -87,7 +87,7 @@ func (api *API) LogOut() (bool, error) {
 // It executes the same request but uses ctx for cancellation and deadlines.
 // See https://core.telegram.org/bots/api#logout
 func (api *API) LogOutWithContext(ctx context.Context) (bool, error) {
-	req := NewRequest[bool, EmptyParams]("logOut", NoParams)
+	req := NewRequest[bool]("logOut", NoParams)
 	return req.DoWithContext(ctx, api)
 }
 
@@ -95,7 +95,7 @@ func (api *API) LogOutWithContext(ctx context.Context) (bool, error) {
 // Returns true on success.
 // See https://core.telegram.org/bots/api#close
 func (api *API) CloseRemote() (bool, error) {
-	req := NewRequest[bool, EmptyParams]("close", NoParams)
+	req := NewRequest[bool]("close", NoParams)
 	return req.Do(api)
 }
 
@@ -103,7 +103,7 @@ func (api *API) CloseRemote() (bool, error) {
 // It executes the same request but uses ctx for cancellation and deadlines.
 // See https://core.telegram.org/bots/api#close
 func (api *API) CloseRemoteWithContext(ctx context.Context) (bool, error) {
-	req := NewRequest[bool, EmptyParams]("close", NoParams)
+	req := NewRequest[bool]("close", NoParams)
 	return req.DoWithContext(ctx, api)
 }
 

tgapi/passport_types.go

@@ -20,19 +20,32 @@ type PassportFile struct {
 type PassportElementType string
 
 const (
-	PassportPersonalDetailsType       PassportElementType = "personal_details"
-	PassportPassportType              PassportElementType = "passport"
-	PassportDriverLicenseType         PassportElementType = "driver_license"
-	PassportIdentityCardType          PassportElementType = "identity_card"
-	PassportInternalPassportType      PassportElementType = "internal_passport"
-	PassportAddressType               PassportElementType = "address"
-	PassportUtilityBillType           PassportElementType = "utility_bill"
-	PassportBankStatementType         PassportElementType = "bank_statement"
-	PassportRentalAgreementType       PassportElementType = "rental_agreement"
-	PassportPassportRegistrationType  PassportElementType = "passport_registration"
+	// PassportPersonalDetailsType identifies personal details.
+	PassportPersonalDetailsType PassportElementType = "personal_details"
+	// PassportPassportType identifies an international passport.
+	PassportPassportType PassportElementType = "passport"
+	// PassportDriverLicenseType identifies a driver license.
+	PassportDriverLicenseType PassportElementType = "driver_license"
+	// PassportIdentityCardType identifies an identity card.
+	PassportIdentityCardType PassportElementType = "identity_card"
+	// PassportInternalPassportType identifies an internal passport.
+	PassportInternalPassportType PassportElementType = "internal_passport"
+	// PassportAddressType identifies a residential address.
+	PassportAddressType PassportElementType = "address"
+	// PassportUtilityBillType identifies a utility bill.
+	PassportUtilityBillType PassportElementType = "utility_bill"
+	// PassportBankStatementType identifies a bank statement.
+	PassportBankStatementType PassportElementType = "bank_statement"
+	// PassportRentalAgreementType identifies a rental agreement.
+	PassportRentalAgreementType PassportElementType = "rental_agreement"
+	// PassportPassportRegistrationType identifies a passport registration.
+	PassportPassportRegistrationType PassportElementType = "passport_registration"
+	// PassportTemporaryRegistrationType identifies a temporary registration.
 	PassportTemporaryRegistrationType PassportElementType = "temporary_registration"
-	PassportPhoneNumberType           PassportElementType = "phone_number"
-	PassportEmailType                 PassportElementType = "email"
+	// PassportPhoneNumberType identifies a phone number.
+	PassportPhoneNumberType PassportElementType = "phone_number"
+	// PassportEmailType identifies an email address.
+	PassportEmailType PassportElementType = "email"
 )
 
 // EncryptedPassportElement contains information about documents or other Telegram Passport elements.

tgapi/rich_block_types.go

@@ -0,0 +1,611 @@
+package tgapi
+
+import "encoding/json"
+
+// RichBlock is a block in a structured rich message.
+//
+// Since: Bot API 10.1
+type RichBlock interface {
+	isRichBlock()
+}
+
+// RichBlockCaption is the caption of a media block or container.
+//
+// Since: Bot API 10.1
+type RichBlockCaption struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// Credit contains attribution displayed with the block.
+	Credit RichText
+}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (c RichBlockCaption) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Text   RichText `json:"text"`
+		Credit RichText `json:"credit,omitempty"`
+	}{c.Text, c.Credit})
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+//
+// Since: Bot API 10.1
+func (c *RichBlockCaption) UnmarshalJSON(data []byte) error {
+	var raw struct {
+		Text   json.RawMessage `json:"text"`
+		Credit json.RawMessage `json:"credit"`
+	}
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return err
+	}
+	text, err := parseOptRichText(raw.Text)
+	if err != nil {
+		return err
+	}
+	credit, err := parseOptRichText(raw.Credit)
+	if err != nil {
+		return err
+	}
+	*c = RichBlockCaption{text, credit}
+	return nil
+}
+
+// RichBlockListItem is a single list item. Label is the ready-to-display
+// visible marker ("1.", "c.", "vii.", "•"): the server renders it itself
+// when parsing html/markdown.
+//
+// Since: Bot API 10.1
+type RichBlockListItem struct {
+	// Label contains the list-item label.
+	Label string
+	// Blocks contains the nested rich-message blocks.
+	Blocks []RichBlock
+	// HasCheckbox reports whether the list item includes a checkbox.
+	HasCheckbox bool
+	// IsChecked reports whether the list-item checkbox is checked.
+	IsChecked bool
+	Value     int                   // for ordered lists: numeric value of the marker
+	Type      RichBlockListItemType // for ordered lists: "a", "A", "i", "I" or "1"
+}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (i RichBlockListItem) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Label       string                `json:"label"`
+		Blocks      []RichBlock           `json:"blocks"`
+		HasCheckbox bool                  `json:"has_checkbox,omitempty"`
+		IsChecked   bool                  `json:"is_checked,omitempty"`
+		Value       int                   `json:"value,omitempty"`
+		Type        RichBlockListItemType `json:"type,omitempty"`
+	}{i.Label, i.Blocks, i.HasCheckbox, i.IsChecked, i.Value, i.Type})
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+//
+// Since: Bot API 10.1
+func (i *RichBlockListItem) UnmarshalJSON(data []byte) error {
+	var raw struct {
+		Label       string                `json:"label"`
+		Blocks      json.RawMessage       `json:"blocks"`
+		HasCheckbox bool                  `json:"has_checkbox"`
+		IsChecked   bool                  `json:"is_checked"`
+		Value       int                   `json:"value"`
+		Type        RichBlockListItemType `json:"type"`
+	}
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return err
+	}
+	blocks, err := unmarshalRichBlocks(raw.Blocks)
+	if err != nil {
+		return err
+	}
+	*i = RichBlockListItem{raw.Label, blocks, raw.HasCheckbox, raw.IsChecked, raw.Value, raw.Type}
+	return nil
+}
+
+// RichBlockTableCell is a table cell. An empty Text means an invisible cell.
+//
+// Since: Bot API 10.1
+type RichBlockTableCell struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// IsHeader marks the table cell as a header cell.
+	IsHeader bool
+	// ColSpan is the number of table columns spanned by the cell.
+	ColSpan int
+	// RowSpan is the number of table rows spanned by the cell.
+	RowSpan int
+	Align   string // "left", "center" or "right"
+	VAlign  string // "top", "middle" or "bottom"
+}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (c RichBlockTableCell) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Text     RichText `json:"text,omitempty"`
+		IsHeader bool     `json:"is_header,omitempty"`
+		Colspan  int      `json:"colspan,omitempty"`
+		Rowspan  int      `json:"rowspan,omitempty"`
+		Align    string   `json:"align,omitempty"`
+		VAlign   string   `json:"valign,omitempty"`
+	}{c.Text, c.IsHeader, c.ColSpan, c.RowSpan, c.Align, c.VAlign})
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+//
+// Since: Bot API 10.1
+func (c *RichBlockTableCell) UnmarshalJSON(data []byte) error {
+	var raw struct {
+		Text     json.RawMessage `json:"text"`
+		IsHeader bool            `json:"is_header"`
+		Colspan  int             `json:"colspan"`
+		Rowspan  int             `json:"rowspan"`
+		Align    string          `json:"align"`
+		VAlign   string          `json:"valign"`
+	}
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return err
+	}
+	text, err := parseOptRichText(raw.Text)
+	if err != nil {
+		return err
+	}
+	*c = RichBlockTableCell{text, raw.IsHeader, raw.Colspan, raw.Rowspan, raw.Align, raw.VAlign}
+	return nil
+}
+
+// RichBlockWrap covers all blocks that have only a text field.
+//
+// Since: Bot API 10.1
+type RichBlockWrap struct {
+	// Tag identifies the rich-text formatting wrapper.
+	Tag string
+	// Text contains the formatted or plain text content.
+	Text RichText
+}
+
+func (RichBlockWrap) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockWrap) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type string   `json:"type"`
+		Text RichText `json:"text"`
+	}{b.Tag, b.Text})
+}
+
+var richBlockWrapTags = map[string]bool{
+	"paragraph": true, "footer": true, "thinking": true,
+}
+
+// RichBlockSectionHeading is a section heading block.
+//
+// Since: Bot API 10.1
+type RichBlockSectionHeading struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	Size int // 1-6, 1 is the largest
+}
+
+func (RichBlockSectionHeading) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockSectionHeading) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type string   `json:"type"`
+		Text RichText `json:"text"`
+		Size int      `json:"size"`
+	}{"heading", b.Text, b.Size})
+}
+
+// RichBlockPreformatted is a preformatted code block.
+//
+// Since: Bot API 10.1
+type RichBlockPreformatted struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// Language identifies the programming language used for syntax highlighting.
+	Language string
+}
+
+func (RichBlockPreformatted) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockPreformatted) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type     string   `json:"type"`
+		Text     RichText `json:"text"`
+		Language string   `json:"language,omitempty"`
+	}{"pre", b.Text, b.Language})
+}
+
+// RichBlockQuotation is a block quotation with block-level content
+// (officially RichBlockBlockQuotation).
+//
+// Since: Bot API 10.1
+type RichBlockQuotation struct {
+	// Blocks contains the nested rich-message blocks.
+	Blocks []RichBlock
+	// Credit contains attribution displayed with the block.
+	Credit RichText
+}
+
+func (RichBlockQuotation) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockQuotation) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type   string      `json:"type"`
+		Blocks []RichBlock `json:"blocks"`
+		Credit RichText    `json:"credit,omitempty"`
+	}{"blockquote", b.Blocks, b.Credit})
+}
+
+// RichBlockPullQuotation is a pull quotation with inline content.
+//
+// Since: Bot API 10.1
+type RichBlockPullQuotation struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// Credit contains attribution displayed with the block.
+	Credit RichText
+}
+
+func (RichBlockPullQuotation) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockPullQuotation) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type   string   `json:"type"`
+		Text   RichText `json:"text"`
+		Credit RichText `json:"credit,omitempty"`
+	}{"pullquote", b.Text, b.Credit})
+}
+
+// RichBlockList is a list block.
+//
+// Since: Bot API 10.1
+type RichBlockList struct {
+	// Items contains the list items.
+	Items []RichBlockListItem
+}
+
+func (RichBlockList) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockList) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type  string              `json:"type"`
+		Items []RichBlockListItem `json:"items"`
+	}{"list", b.Items})
+}
+
+// RichBlockCollage is a collage of media blocks.
+//
+// Since: Bot API 10.1
+type RichBlockCollage struct {
+	// Blocks contains the nested rich-message blocks.
+	Blocks []RichBlock
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption
+}
+
+func (RichBlockCollage) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockCollage) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type    string            `json:"type"`
+		Blocks  []RichBlock       `json:"blocks"`
+		Caption *RichBlockCaption `json:"caption,omitempty"`
+	}{"collage", b.Blocks, b.Caption})
+}
+
+// RichBlockSlideshow is a slideshow of media blocks.
+//
+// Since: Bot API 10.1
+type RichBlockSlideshow struct {
+	// Blocks contains the nested rich-message blocks.
+	Blocks []RichBlock
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption
+}
+
+func (RichBlockSlideshow) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockSlideshow) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type    string            `json:"type"`
+		Blocks  []RichBlock       `json:"blocks"`
+		Caption *RichBlockCaption `json:"caption,omitempty"`
+	}{"slideshow", b.Blocks, b.Caption})
+}
+
+// RichBlockDetails is an expandable block with an inline summary.
+//
+// Since: Bot API 10.1
+type RichBlockDetails struct {
+	// Summary contains the visible summary of a details block.
+	Summary RichText
+	// Blocks contains the nested rich-message blocks.
+	Blocks []RichBlock
+	// IsOpen requests the details block to be expanded initially.
+	IsOpen bool
+}
+
+func (RichBlockDetails) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockDetails) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type    string      `json:"type"`
+		Summary RichText    `json:"summary"`
+		Blocks  []RichBlock `json:"blocks"`
+		IsOpen  bool        `json:"is_open,omitempty"`
+	}{"details", b.Summary, b.Blocks, b.IsOpen})
+}
+
+// RichBlockTable is a table block.
+//
+// Since: Bot API 10.1
+type RichBlockTable struct {
+	// Cells contains the table rows and cells.
+	Cells [][]RichBlockTableCell
+	// IsBordered requests visible table borders.
+	IsBordered bool
+	// IsStriped requests alternating table row styling.
+	IsStriped bool
+	// Caption contains the media or block caption.
+	Caption RichText
+}
+
+func (RichBlockTable) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockTable) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type       string                 `json:"type"`
+		Cells      [][]RichBlockTableCell `json:"cells"`
+		IsBordered bool                   `json:"is_bordered,omitempty"`
+		IsStriped  bool                   `json:"is_striped,omitempty"`
+		Caption    RichText               `json:"caption,omitempty"`
+	}{"table", b.Cells, b.IsBordered, b.IsStriped, b.Caption})
+}
+
+// RichBlockMap is a location map block.
+//
+// Since: Bot API 10.1
+type RichBlockMap struct {
+	// Location contains the map location.
+	Location Location
+	Zoom     int // 13-20
+	// Width is the requested media or map width in pixels.
+	Width int
+	// Height is the requested media or map height in pixels.
+	Height int
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption
+}
+
+func (RichBlockMap) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockMap) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type     string            `json:"type"`
+		Location Location          `json:"location"`
+		Zoom     int               `json:"zoom"`
+		Width    int               `json:"width"`
+		Height   int               `json:"height"`
+		Caption  *RichBlockCaption `json:"caption,omitempty"`
+	}{"map", b.Location, b.Zoom, b.Width, b.Height, b.Caption})
+}
+
+// RichBlockPhoto is a photo block.
+//
+// Since: Bot API 10.1
+type RichBlockPhoto struct {
+	// Photo contains or identifies the associated photo.
+	Photo []PhotoSize
+	// HasSpoiler reports whether the media is covered by a spoiler.
+	HasSpoiler bool
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption
+}
+
+func (RichBlockPhoto) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockPhoto) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type       string            `json:"type"`
+		Photo      []PhotoSize       `json:"photo"`
+		HasSpoiler bool              `json:"has_spoiler,omitempty"`
+		Caption    *RichBlockCaption `json:"caption,omitempty"`
+	}{"photo", b.Photo, b.HasSpoiler, b.Caption})
+}
+
+// RichBlockVideo is a video block.
+//
+// Since: Bot API 10.1
+type RichBlockVideo struct {
+	// Video contains the video rendered by the block.
+	Video Video
+	// HasSpoiler reports whether the media is covered by a spoiler.
+	HasSpoiler bool
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption
+}
+
+func (RichBlockVideo) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockVideo) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type       string            `json:"type"`
+		Video      Video             `json:"video"`
+		HasSpoiler bool              `json:"has_spoiler,omitempty"`
+		Caption    *RichBlockCaption `json:"caption,omitempty"`
+	}{"video", b.Video, b.HasSpoiler, b.Caption})
+}
+
+// RichBlockAudio is an audio block.
+//
+// Since: Bot API 10.1
+type RichBlockAudio struct {
+	// Audio contains the audio rendered by the block.
+	Audio Audio
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption
+}
+
+func (RichBlockAudio) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockAudio) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type    string            `json:"type"`
+		Audio   Audio             `json:"audio"`
+		Caption *RichBlockCaption `json:"caption,omitempty"`
+	}{"audio", b.Audio, b.Caption})
+}
+
+// RichBlockAnimation is an animation block.
+//
+// Since: Bot API 10.1
+type RichBlockAnimation struct {
+	// Animation contains the animation rendered by the block.
+	Animation Animation
+	// HasSpoiler reports whether the media is covered by a spoiler.
+	HasSpoiler bool
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption
+}
+
+func (RichBlockAnimation) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockAnimation) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type       string            `json:"type"`
+		Animation  Animation         `json:"animation"`
+		HasSpoiler bool              `json:"has_spoiler,omitempty"`
+		Caption    *RichBlockCaption `json:"caption,omitempty"`
+	}{"animation", b.Animation, b.HasSpoiler, b.Caption})
+}
+
+// RichBlockVoiceNote is a voice note block.
+//
+// Since: Bot API 10.1
+type RichBlockVoiceNote struct {
+	// VoiceNote contains the voice note rendered by the block.
+	VoiceNote Voice
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption
+}
+
+func (RichBlockVoiceNote) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockVoiceNote) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type      string            `json:"type"`
+		VoiceNote Voice             `json:"voice_note"`
+		Caption   *RichBlockCaption `json:"caption,omitempty"`
+	}{"voice_note", b.VoiceNote, b.Caption})
+}
+
+// RichBlockDivider is a horizontal divider block.
+//
+// Since: Bot API 10.1
+type RichBlockDivider struct{}
+
+func (RichBlockDivider) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockDivider) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type string `json:"type"`
+	}{"divider"})
+}
+
+// RichBlockMathematicalExpression is a block-level mathematical expression.
+//
+// Since: Bot API 10.1
+type RichBlockMathematicalExpression struct {
+	// Expression contains the mathematical expression source.
+	Expression string
+}
+
+func (RichBlockMathematicalExpression) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockMathematicalExpression) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type       string `json:"type"`
+		Expression string `json:"expression"`
+	}{"mathematical_expression", b.Expression})
+}
+
+// RichBlockAnchor is a named anchor block that anchor links can point to.
+//
+// Since: Bot API 10.1
+type RichBlockAnchor struct {
+	// Name is the user-facing or reference name of the value.
+	Name string
+}
+
+func (RichBlockAnchor) isRichBlock() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (b RichBlockAnchor) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type string `json:"type"`
+		Name string `json:"name"`
+	}{"anchor", b.Name})
+}

tgapi/rich_input_types.go

@@ -0,0 +1,427 @@
+package tgapi
+
+// InputRichType identifies the JSON type of an input rich block.
+//
+// Since: Bot API 10.2
+type InputRichType string
+
+const (
+	// InputRichTypeParagraph identifies a paragraph block.
+	InputRichTypeParagraph InputRichType = "paragraph"
+	// InputRichTypeSectionHeading identifies a section-heading block.
+	InputRichTypeSectionHeading InputRichType = "heading"
+	// InputRichTypePre identifies a preformatted block.
+	InputRichTypePre InputRichType = "pre"
+	// InputRichTypeFooter identifies a footer block.
+	InputRichTypeFooter InputRichType = "footer"
+	// InputRichTypeDivider identifies a divider block.
+	InputRichTypeDivider InputRichType = "divider"
+	// InputRichTypeMathematicalExpression identifies a mathematical-expression block.
+	InputRichTypeMathematicalExpression InputRichType = "mathematical_expression"
+	// InputRichTypeAnchor identifies an anchor block.
+	InputRichTypeAnchor InputRichType = "anchor"
+	// InputRichTypeList identifies a list block.
+	InputRichTypeList InputRichType = "list"
+	// InputRichTypeBlockQuotation identifies a block-quotation block.
+	InputRichTypeBlockQuotation InputRichType = "blockquote"
+	// InputRichTypePullQuotation identifies a pull-quotation block.
+	InputRichTypePullQuotation InputRichType = "pullquote"
+	// InputRichTypeCollage identifies a collage block.
+	InputRichTypeCollage InputRichType = "collage"
+	// InputRichTypeSlideshow identifies a slideshow block.
+	InputRichTypeSlideshow InputRichType = "slideshow"
+	// InputRichTypeTable identifies a table block.
+	InputRichTypeTable InputRichType = "table"
+	// InputRichTypeDetails identifies an expandable details block.
+	InputRichTypeDetails InputRichType = "details"
+	// InputRichTypeMap identifies a map block.
+	InputRichTypeMap InputRichType = "map"
+	// InputRichTypeAnimation identifies an animation block.
+	InputRichTypeAnimation InputRichType = "animation"
+	// InputRichTypeAudio identifies an audio block.
+	InputRichTypeAudio InputRichType = "audio"
+	// InputRichTypePhoto identifies a photo block.
+	InputRichTypePhoto InputRichType = "photo"
+	// InputRichTypeVideo identifies a video block.
+	InputRichTypeVideo InputRichType = "video"
+	// InputRichTypeVoiceNote identifies a voice-note block.
+	InputRichTypeVoiceNote InputRichType = "voice_note"
+	// InputRichTypeThinking identifies a thinking block.
+	InputRichTypeThinking InputRichType = "thinking"
+)
+
+// InputRichBlock represents a block available to format an outgoing rich message.
+//
+// Since: Bot API 10.2
+type InputRichBlock interface {
+	isInputRichBlock()
+}
+
+// InputRichBlockParagraph is a text paragraph corresponding to the HTML <p> tag.
+//
+// Since: Bot API 10.2
+type InputRichBlockParagraph struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Text contains the formatted or plain text content.
+	Text RichText `json:"text"`
+}
+
+func (InputRichBlockParagraph) isInputRichBlock() {}
+
+// InputRichBlockSectionHeading is a section heading corresponding to an HTML <h1> through <h6> tag.
+//
+// Since: Bot API 10.2
+type InputRichBlockSectionHeading struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Text contains the formatted or plain text content.
+	Text RichText `json:"text"`
+	// Size selects the section heading level from 1 through 6.
+	Size uint8 `json:"size"`
+}
+
+func (InputRichBlockSectionHeading) isInputRichBlock() {}
+
+// InputRichBlockPreformatted is a preformatted text block corresponding to nested HTML <pre> and <code> tags.
+//
+// Since: Bot API 10.2
+type InputRichBlockPreformatted struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Text contains the formatted or plain text content.
+	Text RichText `json:"text"`
+	// Language identifies the programming language used for syntax highlighting.
+	Language string `json:"language,omitempty"`
+}
+
+func (InputRichBlockPreformatted) isInputRichBlock() {}
+
+// InputRichBlockFooter is a footer corresponding to the HTML <footer> tag.
+//
+// Since: Bot API 10.2
+type InputRichBlockFooter struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Text contains the formatted or plain text content.
+	Text RichText `json:"text"`
+}
+
+func (InputRichBlockFooter) isInputRichBlock() {}
+
+// InputRichBlockDivider is a divider corresponding to the HTML <hr/> tag.
+//
+// Since: Bot API 10.2
+type InputRichBlockDivider struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+}
+
+func (InputRichBlockDivider) isInputRichBlock() {}
+
+// InputRichBlockMath is a block containing a mathematical expression in LaTeX format,
+// corresponding to the custom HTML <tg-math-block> tag.
+//
+// Since: Bot API 10.2
+type InputRichBlockMath struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Expression contains the mathematical expression source.
+	Expression string `json:"expression"`
+}
+
+func (InputRichBlockMath) isInputRichBlock() {}
+
+// InputRichBlockAnchor is a block containing an anchor corresponding to an HTML <a> tag with a name attribute.
+//
+// Since: Bot API 10.2
+type InputRichBlockAnchor struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Name is the user-facing or reference name of the value.
+	Name string `json:"name"`
+}
+
+func (InputRichBlockAnchor) isInputRichBlock() {}
+
+// RichBlockListItemType identifies an ordered-list label style.
+//
+// Since: Bot API 10.2
+type RichBlockListItemType string
+
+const (
+	// InputRichBlockListItemTypeLower uses lowercase letters.
+	InputRichBlockListItemTypeLower RichBlockListItemType = "a"
+	// InputRichBlockListItemTypeUpper uses uppercase letters.
+	InputRichBlockListItemTypeUpper RichBlockListItemType = "A"
+	// InputRichBlockListItemTypeRomanLow uses lowercase Roman numerals.
+	InputRichBlockListItemTypeRomanLow RichBlockListItemType = "i"
+	// InputRichBlockListItemTypeRomanUpper uses uppercase Roman numerals.
+	InputRichBlockListItemTypeRomanUpper RichBlockListItemType = "I"
+	// InputRichBlockListItemTypeDecimal uses decimal numbers.
+	InputRichBlockListItemTypeDecimal RichBlockListItemType = "1"
+)
+
+// InputRichBlockListItem represents an item in an input rich-message list.
+//
+// Since: Bot API 10.2
+type InputRichBlockListItem struct {
+	// Blocks contains the nested rich-message blocks.
+	Blocks []InputRichBlock `json:"blocks"`
+	// HasCheckbox reports whether the list item includes a checkbox.
+	HasCheckbox bool `json:"has_checkbox,omitempty"`
+	// IsChecked reports whether the list-item checkbox is checked.
+	IsChecked bool `json:"is_checked,omitempty"`
+	// Value sets the numeric marker value for an ordered list item.
+	Value int `json:"value,omitempty"`
+	// Type is the Bot API type discriminator.
+	Type RichBlockListItemType `json:"type,omitempty"`
+}
+
+// NewInputRichBlockListItem creates a list item containing blocks.
+//
+// Since: Bot API 10.2
+func NewInputRichBlockListItem(blocks ...InputRichBlock) *InputRichBlockListItem {
+	return &InputRichBlockListItem{Blocks: blocks}
+}
+
+// SetCheckbox configures whether the list item has a checkbox.
+//
+// Since: Bot API 10.2
+func (i *InputRichBlockListItem) SetCheckbox(hasCheckbox bool) *InputRichBlockListItem {
+	i.HasCheckbox = hasCheckbox
+	return i
+}
+
+// Check marks the list item's checkbox as checked.
+//
+// Since: Bot API 10.2
+func (i *InputRichBlockListItem) Check() *InputRichBlockListItem {
+	i.IsChecked = true
+	return i
+}
+
+// SetValue sets the numeric value of an ordered-list item.
+//
+// Since: Bot API 10.2
+func (i *InputRichBlockListItem) SetValue(val int) *InputRichBlockListItem {
+	i.Value = val
+	return i
+}
+
+// SetType sets the label style of an ordered-list item.
+//
+// Since: Bot API 10.2
+func (i *InputRichBlockListItem) SetType(t RichBlockListItemType) *InputRichBlockListItem {
+	i.Type = t
+	return i
+}
+
+// InputRichBlockList is a list of input rich-message blocks.
+//
+// Since: Bot API 10.2
+type InputRichBlockList struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Items contains the list items.
+	Items []InputRichBlockListItem `json:"items"`
+}
+
+func (InputRichBlockList) isInputRichBlock() {}
+
+// InputRichBlockBlockQuotation is a block quotation in an input rich message.
+//
+// Since: Bot API 10.2
+type InputRichBlockBlockQuotation struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Blocks contains the nested rich-message blocks.
+	Blocks []InputRichBlock `json:"blocks"`
+	// Credit contains attribution displayed with the block.
+	Credit *RichText `json:"credit,omitempty"`
+}
+
+func (InputRichBlockBlockQuotation) isInputRichBlock() {}
+
+// InputRichBlockPullQuotation is a centered quotation in an input rich message.
+//
+// Since: Bot API 10.2
+type InputRichBlockPullQuotation struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Text contains the formatted or plain text content.
+	Text RichText `json:"text"`
+	// Credit contains attribution displayed with the block.
+	Credit *RichText `json:"credit,omitempty"`
+}
+
+func (InputRichBlockPullQuotation) isInputRichBlock() {}
+
+// InputRichBlockCollage is a collage in an input rich message.
+//
+// Since: Bot API 10.2
+type InputRichBlockCollage struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Blocks contains the nested rich-message blocks.
+	Blocks []InputRichBlock `json:"blocks"`
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption `json:"caption,omitempty"`
+}
+
+func (InputRichBlockCollage) isInputRichBlock() {}
+
+// InputRichBlockSlideshow is a slideshow in an input rich message.
+//
+// Since: Bot API 10.2
+type InputRichBlockSlideshow struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Blocks contains the nested rich-message blocks.
+	Blocks []InputRichBlock `json:"blocks"`
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption `json:"caption,omitempty"`
+}
+
+func (InputRichBlockSlideshow) isInputRichBlock() {}
+
+// InputRichBlockTable is a table in an input rich message.
+//
+// Since: Bot API 10.2
+type InputRichBlockTable struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Cells contains the table rows and cells.
+	Cells [][]RichBlockTableCell `json:"cells"`
+	// IsBordered requests visible table borders.
+	IsBordered bool `json:"is_bordered,omitempty"`
+	// IsStriped requests alternating table row styling.
+	IsStriped bool `json:"is_striped,omitempty"`
+	// Caption contains the media or block caption.
+	Caption *RichText `json:"caption,omitempty"`
+}
+
+func (InputRichBlockTable) isInputRichBlock() {}
+
+// InputRichBlockDetails is an expandable block in an input rich message.
+//
+// Since: Bot API 10.2
+type InputRichBlockDetails struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Summary contains the visible summary of a details block.
+	Summary RichText `json:"summary"`
+	// Blocks contains the nested rich-message blocks.
+	Blocks []InputRichBlock `json:"blocks"`
+	// IsOpen requests the details block to be expanded initially.
+	IsOpen bool `json:"is_open,omitempty"`
+}
+
+func (InputRichBlockDetails) isInputRichBlock() {}
+
+// InputRichBlockMap is a location map in an input rich message.
+//
+// Since: Bot API 10.2
+type InputRichBlockMap struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Location contains the map location.
+	Location Location `json:"location"`
+	// Zoom sets the map zoom level.
+	Zoom uint8 `json:"zoom,omitempty"`
+	// Width is the requested media or map width in pixels.
+	Width uint16 `json:"width,omitempty"`
+	// Height is the requested media or map height in pixels.
+	Height uint16 `json:"height,omitempty"`
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption `json:"caption,omitempty"`
+}
+
+func (InputRichBlockMap) isInputRichBlock() {}
+
+// InputRichBlockAnimation is an animation block corresponding to the HTML <video> tag.
+// The animation caption is ignored; use Caption instead.
+//
+// Since: Bot API 10.2
+type InputRichBlockAnimation struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Animation contains the animation rendered by the block.
+	Animation InputMedia `json:"animation"`
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption `json:"caption,omitempty"`
+}
+
+func (InputRichBlockAnimation) isInputRichBlock() {}
+
+// InputRichBlockAudio is a music-file block corresponding to the HTML <audio> tag.
+// The audio caption is ignored; use Caption instead.
+//
+// Since: Bot API 10.2
+type InputRichBlockAudio struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Audio contains the audio rendered by the block.
+	Audio InputMedia `json:"audio"`
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption `json:"caption,omitempty"`
+}
+
+func (InputRichBlockAudio) isInputRichBlock() {}
+
+// InputRichBlockPhoto is a photo block corresponding to the HTML <img> tag.
+// The photo caption is ignored; use Caption instead.
+//
+// Since: Bot API 10.2
+type InputRichBlockPhoto struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Photo contains or identifies the associated photo.
+	Photo InputMedia `json:"photo"`
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption `json:"caption,omitempty"`
+}
+
+func (InputRichBlockPhoto) isInputRichBlock() {}
+
+// InputRichBlockVideo is a video block corresponding to the HTML <video> tag.
+// The video caption is ignored; use Caption instead.
+//
+// Since: Bot API 10.2
+type InputRichBlockVideo struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Video contains the video rendered by the block.
+	Video InputMedia `json:"video"`
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption `json:"caption,omitempty"`
+}
+
+func (InputRichBlockVideo) isInputRichBlock() {}
+
+// InputRichBlockVoiceNote is a voice-note block corresponding to the HTML <audio> tag.
+// The voice-note caption is ignored; use Caption instead.
+//
+// Since: Bot API 10.2
+type InputRichBlockVoiceNote struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// VoiceNote contains the voice note rendered by the block.
+	VoiceNote InputMedia `json:"voice_note"`
+	// Caption contains the media or block caption.
+	Caption *RichBlockCaption `json:"caption,omitempty"`
+}
+
+func (InputRichBlockVoiceNote) isInputRichBlock() {}
+
+// InputRichBlockThinking is a block for displaying a thinking state.
+//
+// Since: Bot API 10.2
+type InputRichBlockThinking struct {
+	// Type is the Bot API type discriminator.
+	Type InputRichType `json:"type"`
+	// Text contains the formatted or plain text content.
+	Text RichText `json:"text"`
+}
+
+func (InputRichBlockThinking) isInputRichBlock() {}

tgapi/rich_input_types_test.go

@@ -0,0 +1,65 @@
+package tgapi
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestInputRichMediaBlocksMarshal(t *testing.T) {
+	caption := RichBlockCaption{Text: RichTextPlain("caption")}
+	cases := []struct {
+		name      string
+		block     InputRichBlock
+		blockType InputRichType
+		mediaKey  string
+		mediaType InputMediaType
+	}{
+		{"animation", InputRichBlockAnimation{Type: InputRichTypeAnimation, Animation: InputMedia{Type: InputMediaTypeAnimation, Media: "animation-id"}, Caption: &caption}, InputRichTypeAnimation, "animation", InputMediaTypeAnimation},
+		{"audio", InputRichBlockAudio{Type: InputRichTypeAudio, Audio: InputMedia{Type: InputMediaTypeAudio, Media: "audio-id"}, Caption: &caption}, InputRichTypeAudio, "audio", InputMediaTypeAudio},
+		{"photo", InputRichBlockPhoto{Type: InputRichTypePhoto, Photo: InputMedia{Type: InputMediaTypePhoto, Media: "photo-id"}, Caption: &caption}, InputRichTypePhoto, "photo", InputMediaTypePhoto},
+		{"video", InputRichBlockVideo{Type: InputRichTypeVideo, Video: InputMedia{Type: InputMediaTypeVideo, Media: "video-id"}, Caption: &caption}, InputRichTypeVideo, "video", InputMediaTypeVideo},
+		{"voice note", InputRichBlockVoiceNote{Type: InputRichTypeVoiceNote, VoiceNote: InputMedia{Type: InputMediaTypeVoiceNote, Media: "voice-id"}, Caption: &caption}, InputRichTypeVoiceNote, "voice_note", InputMediaTypeVoiceNote},
+	}
+
+	for _, tt := range cases {
+		t.Run(tt.name, func(t *testing.T) {
+			data, err := json.Marshal(InputRichMessage{Blocks: []InputRichBlock{tt.block}})
+			if err != nil {
+				t.Fatalf("Marshal returned error: %v", err)
+			}
+
+			var message struct {
+				Blocks []map[string]json.RawMessage `json:"blocks"`
+			}
+			if err := json.Unmarshal(data, &message); err != nil {
+				t.Fatalf("Unmarshal returned error: %v", err)
+			}
+			if len(message.Blocks) != 1 {
+				t.Fatalf("got %d blocks, want 1", len(message.Blocks))
+			}
+
+			var blockType InputRichType
+			if err := json.Unmarshal(message.Blocks[0]["type"], &blockType); err != nil {
+				t.Fatalf("unmarshal block type: %v", err)
+			}
+			if blockType != tt.blockType {
+				t.Errorf("block type = %q, want %q", blockType, tt.blockType)
+			}
+
+			var media InputMedia
+			if err := json.Unmarshal(message.Blocks[0][tt.mediaKey], &media); err != nil {
+				t.Fatalf("unmarshal %s: %v", tt.mediaKey, err)
+			}
+			if media.Type != tt.mediaType {
+				t.Errorf("media type = %q, want %q", media.Type, tt.mediaType)
+			}
+			if message.Blocks[0]["caption"] == nil {
+				t.Error("caption is missing")
+			}
+		})
+	}
+}
+
+func TestInputRichBlockMapImplementsInputRichBlock(t *testing.T) {
+	var _ InputRichBlock = InputRichBlockMap{}
+}

tgapi/rich_text_types.go

@@ -0,0 +1,418 @@
+package tgapi
+
+import "encoding/json"
+
+// RichText is a node of the rich formatted text tree: a plain string, an
+// array, or one of the typed objects below.
+//
+// Since: Bot API 10.1
+type RichText interface {
+	isRichText()
+}
+
+// RichTextPlain is a plain text leaf.
+//
+// Since: Bot API 10.1
+type RichTextPlain string
+
+func (RichTextPlain) isRichText() {}
+
+// RichTextArray is a concatenation of rich text nodes.
+//
+// Since: Bot API 10.1
+type RichTextArray []RichText
+
+func (RichTextArray) isRichText() {}
+
+// RichTextWrap covers all "pure" wrapper nodes with a single type.
+//
+// Since: Bot API 10.1
+type RichTextWrap struct {
+	// Tag identifies the rich-text formatting wrapper.
+	Tag string
+	// Text contains the formatted or plain text content.
+	Text RichText
+}
+
+func (RichTextWrap) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (w RichTextWrap) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type string   `json:"type"`
+		Text RichText `json:"text"`
+	}{w.Tag, w.Text})
+}
+
+var richTextWrapTags = map[string]bool{
+	"bold": true, "italic": true, "underline": true,
+	"strikethrough": true, "spoiler": true, "subscript": true,
+	"superscript": true, "marked": true, "code": true,
+}
+
+// RichTextURL is rich text linking to a URL.
+//
+// Since: Bot API 10.1
+type RichTextURL struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// URL contains the HTTP URL.
+	URL string
+}
+
+func (RichTextURL) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextURL) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type string   `json:"type"`
+		Text RichText `json:"text"`
+		URL  string   `json:"url"`
+	}{"url", v.Text, v.URL})
+}
+
+// RichTextEmailAddress is rich text linking to an email address.
+//
+// Since: Bot API 10.1
+type RichTextEmailAddress struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// EmailAddress is the email address associated with the text.
+	EmailAddress string
+}
+
+func (RichTextEmailAddress) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextEmailAddress) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type         string   `json:"type"`
+		Text         RichText `json:"text"`
+		EmailAddress string   `json:"email_address"`
+	}{"email_address", v.Text, v.EmailAddress})
+}
+
+// RichTextPhoneNumber is rich text linking to a phone number.
+//
+// Since: Bot API 10.1
+type RichTextPhoneNumber struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// PhoneNumber is the phone number associated with the text.
+	PhoneNumber string
+}
+
+func (RichTextPhoneNumber) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextPhoneNumber) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type        string   `json:"type"`
+		Text        RichText `json:"text"`
+		PhoneNumber string   `json:"phone_number"`
+	}{"phone_number", v.Text, v.PhoneNumber})
+}
+
+// RichTextBankCardNumber is rich text marked as a bank card number.
+//
+// Since: Bot API 10.1
+type RichTextBankCardNumber struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// BankCardNumber is the bank card number associated with the text.
+	BankCardNumber string
+}
+
+func (RichTextBankCardNumber) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextBankCardNumber) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type           string   `json:"type"`
+		Text           RichText `json:"text"`
+		BankCardNumber string   `json:"bank_card_number"`
+	}{"bank_card_number", v.Text, v.BankCardNumber})
+}
+
+// RichTextMention is rich text mentioning a user by username.
+//
+// Since: Bot API 10.1
+type RichTextMention struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// Username is the username associated with the mention.
+	Username string
+}
+
+func (RichTextMention) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextMention) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type     string   `json:"type"`
+		Text     RichText `json:"text"`
+		Username string   `json:"username"`
+	}{"mention", v.Text, v.Username})
+}
+
+// RichTextHashtag is rich text marked as a hashtag.
+//
+// Since: Bot API 10.1
+type RichTextHashtag struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// Hashtag is the hashtag associated with the text.
+	Hashtag string
+}
+
+func (RichTextHashtag) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextHashtag) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type    string   `json:"type"`
+		Text    RichText `json:"text"`
+		Hashtag string   `json:"hashtag"`
+	}{"hashtag", v.Text, v.Hashtag})
+}
+
+// RichTextCashtag is rich text marked as a cashtag.
+//
+// Since: Bot API 10.1
+type RichTextCashtag struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// Cashtag is the cashtag associated with the text.
+	Cashtag string
+}
+
+func (RichTextCashtag) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextCashtag) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type    string   `json:"type"`
+		Text    RichText `json:"text"`
+		Cashtag string   `json:"cashtag"`
+	}{"cashtag", v.Text, v.Cashtag})
+}
+
+// RichTextBotCommand is rich text marked as a bot command.
+//
+// Since: Bot API 10.1
+type RichTextBotCommand struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// BotCommand is the bot command associated with the text.
+	BotCommand string
+}
+
+func (RichTextBotCommand) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextBotCommand) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type       string   `json:"type"`
+		Text       RichText `json:"text"`
+		BotCommand string   `json:"bot_command"`
+	}{"bot_command", v.Text, v.BotCommand})
+}
+
+// RichTextAnchorLink is rich text linking to a named anchor in the same message.
+//
+// Since: Bot API 10.1
+type RichTextAnchorLink struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// AnchorName names the anchor targeted by the link.
+	AnchorName string
+}
+
+func (RichTextAnchorLink) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextAnchorLink) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type       string   `json:"type"`
+		Text       RichText `json:"text"`
+		AnchorName string   `json:"anchor_name"`
+	}{"anchor_link", v.Text, v.AnchorName})
+}
+
+// RichTextReference is rich text marked as a named reference target.
+//
+// Since: Bot API 10.1
+type RichTextReference struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// Name is the user-facing or reference name of the value.
+	Name string
+}
+
+func (RichTextReference) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextReference) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type string   `json:"type"`
+		Text RichText `json:"text"`
+		Name string   `json:"name"`
+	}{"reference", v.Text, v.Name})
+}
+
+// RichTextReferenceLink is rich text linking to a named reference.
+//
+// Since: Bot API 10.1
+type RichTextReferenceLink struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// ReferenceName names the reference targeted by the link.
+	ReferenceName string
+}
+
+func (RichTextReferenceLink) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextReferenceLink) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type          string   `json:"type"`
+		Text          RichText `json:"text"`
+		ReferenceName string   `json:"reference_name"`
+	}{"reference_link", v.Text, v.ReferenceName})
+}
+
+// RichTextDateTime is rich text bound to a point in time with a display format.
+//
+// Since: Bot API 10.1
+type RichTextDateTime struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// UnixTime is the Unix timestamp associated with the text.
+	UnixTime int64
+	// DateTimeFormat controls how the associated Unix time is displayed.
+	DateTimeFormat string
+}
+
+func (RichTextDateTime) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextDateTime) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type           string   `json:"type"`
+		Text           RichText `json:"text"`
+		UnixTime       int64    `json:"unix_time"`
+		DateTimeFormat string   `json:"date_time_format"`
+	}{"date_time", v.Text, v.UnixTime, v.DateTimeFormat})
+}
+
+// RichTextTextMention is rich text mentioning a user without a username.
+//
+// Since: Bot API 10.1
+type RichTextTextMention struct {
+	// Text contains the formatted or plain text content.
+	Text RichText
+	// User contains the user associated with the value.
+	User User
+}
+
+func (RichTextTextMention) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextTextMention) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type string   `json:"type"`
+		Text RichText `json:"text"`
+		User User     `json:"user"`
+	}{"text_mention", v.Text, v.User})
+}
+
+// RichTextCustomEmoji is a custom emoji leaf with alternative text.
+//
+// Since: Bot API 10.1
+type RichTextCustomEmoji struct {
+	// CustomEmojiID identifies the custom emoji.
+	CustomEmojiID string
+	// AlternativeText is shown when the custom emoji can't be rendered.
+	AlternativeText string
+}
+
+func (RichTextCustomEmoji) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextCustomEmoji) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type            string `json:"type"`
+		CustomEmojiID   string `json:"custom_emoji_id"`
+		AlternativeText string `json:"alternative_text"`
+	}{"custom_emoji", v.CustomEmojiID, v.AlternativeText})
+}
+
+// RichTextMathematicalExpression is an inline mathematical expression leaf.
+//
+// Since: Bot API 10.1
+type RichTextMathematicalExpression struct {
+	// Expression contains the mathematical expression source.
+	Expression string
+}
+
+func (RichTextMathematicalExpression) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextMathematicalExpression) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type       string `json:"type"`
+		Expression string `json:"expression"`
+	}{"mathematical_expression", v.Expression})
+}
+
+// RichTextAnchor is a named anchor leaf that anchor links can point to.
+//
+// Since: Bot API 10.1
+type RichTextAnchor struct {
+	// Name is the user-facing or reference name of the value.
+	Name string
+}
+
+func (RichTextAnchor) isRichText() {}
+
+// MarshalJSON implements json.Marshaler.
+//
+// Since: Bot API 10.1
+func (v RichTextAnchor) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Type string `json:"type"`
+		Name string `json:"name"`
+	}{"anchor", v.Name})
+}

tgapi/rich_text_types_test.go

@@ -0,0 +1,85 @@
+package tgapi
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func roundtripRichText(t *testing.T, in RichText) {
+	t.Helper()
+	b, err := json.Marshal(in)
+	if err != nil {
+		t.Fatalf("marshal: %v", err)
+	}
+	out, err := UnmarshalRichText(b)
+	if err != nil {
+		t.Fatalf("unmarshal %s: %v", b, err)
+	}
+	b2, err := json.Marshal(out)
+	if err != nil {
+		t.Fatalf("remarshal: %v", err)
+	}
+	if string(b) != string(b2) {
+		t.Fatalf("not stable:\n  %s\n  %s", b, b2)
+	}
+}
+
+func TestRichTextRoundtrip(t *testing.T) {
+	cases := []RichText{
+		RichTextPlain("hello"),
+		RichTextArray{RichTextPlain("a "), RichTextWrap{"bold", RichTextPlain("b")}, RichTextPlain(" c")},
+		RichTextWrap{"bold", RichTextWrap{"italic", RichTextPlain("nested")}},
+		RichTextURL{RichTextPlain("Anthropic"), "https://anthropic.com"},
+		RichTextCustomEmoji{"5368324170671202286", "👍"},
+		RichTextMathematicalExpression{"x^2 + y^2"},
+		RichTextAnchor{"chapter-1"},
+		RichTextDateTime{RichTextPlain("22:45 tomorrow"), 1647531900, "wDT"},
+		RichTextTextMention{RichTextPlain("Bob"), User{ID: 42, FirstName: "Bob"}},
+		RichTextAnchorLink{RichTextPlain("back to top"), ""},
+		RichTextReference{RichTextPlain("ref"), "note-1"},
+		// deep nesting
+		RichTextWrap{"bold", RichTextArray{
+			RichTextPlain("bold and "),
+			RichTextWrap{"italic", RichTextWrap{"underline", RichTextPlain("deep")}},
+			RichTextWrap{"spoiler", RichTextCustomEmoji{"1", "x"}},
+		}},
+	}
+	for _, c := range cases {
+		roundtripRichText(t, c)
+	}
+}
+
+func TestRichTextPlainFormsAreBare(t *testing.T) {
+	b, _ := json.Marshal(RichTextPlain("hi"))
+	if string(b) != `"hi"` {
+		t.Fatalf("string should be bare: %s", b)
+	}
+	b, _ = json.Marshal(RichTextArray{RichTextPlain("a"), RichTextPlain("b")})
+	if string(b) != `["a","b"]` {
+		t.Fatalf("array should be bare: %s", b)
+	}
+}
+
+func TestRichTextLeafHasNoText(t *testing.T) {
+	b, _ := json.Marshal(RichTextAnchor{"x"})
+	var m map[string]any
+	_ = json.Unmarshal(b, &m)
+	if _, ok := m["text"]; ok {
+		t.Fatalf("anchor must not have text field: %s", b)
+	}
+}
+
+func TestUnmarshalRichTextRejectsInvalidValues(t *testing.T) {
+	tests := []string{
+		`null`,
+		`{"type":"date_time","text":"now","unix_time":"soon"}`,
+		`{"type":"custom_emoji","custom_emoji_id":42}`,
+	}
+	for _, raw := range tests {
+		t.Run(raw, func(t *testing.T) {
+			if _, err := UnmarshalRichText([]byte(raw)); err == nil {
+				t.Fatal("expected malformed rich text to be rejected")
+			}
+		})
+	}
+}

tgapi/rich_utils.go

@@ -0,0 +1,514 @@
+package tgapi
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+)
+
+// UnmarshalRichText parses a RichText tree from JSON: a string, an array, or
+// a typed object. Unknown object types that carry a text field are preserved
+// as RichTextWrap so their nested text remains usable; unmodeled fields are
+// discarded.
+//
+// Since: Bot API 10.1
+func UnmarshalRichText(data []byte) (RichText, error) {
+	if bytes.Equal(bytes.TrimSpace(data), []byte("null")) {
+		return nil, fmt.Errorf("richtext: null is not a rich text value")
+	}
+	// 1. string
+	var s string
+	if err := json.Unmarshal(data, &s); err == nil {
+		return RichTextPlain(s), nil
+	}
+	// 2. array
+	var raw []json.RawMessage
+	if err := json.Unmarshal(data, &raw); err == nil {
+		arr := make(RichTextArray, len(raw))
+		for i, it := range raw {
+			rt, err := UnmarshalRichText(it)
+			if err != nil {
+				return nil, err
+			}
+			arr[i] = rt
+		}
+		return arr, nil
+	}
+	// 3. object -> dispatch on type, grabbing the raw text along the way
+	var head struct {
+		Type string          `json:"type"`
+		Text json.RawMessage `json:"text"`
+	}
+	if err := json.Unmarshal(data, &head); err != nil {
+		return nil, fmt.Errorf("richtext: not a string, array or object: %w", err)
+	}
+
+	// Recursively parse the nested text, if any.
+	var inner RichText
+	if len(head.Text) > 0 {
+		var err error
+		if inner, err = UnmarshalRichText(head.Text); err != nil {
+			return nil, fmt.Errorf("richtext %q: bad text: %w", head.Type, err)
+		}
+	}
+
+	if richTextWrapTags[head.Type] {
+		return RichTextWrap{Tag: head.Type, Text: inner}, nil
+	}
+
+	switch head.Type {
+	case "url":
+		var v struct {
+			URL string `json:"url"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextURL{inner, v.URL}, nil
+	case "email_address":
+		var v struct {
+			V string `json:"email_address"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextEmailAddress{inner, v.V}, nil
+	case "phone_number":
+		var v struct {
+			V string `json:"phone_number"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextPhoneNumber{inner, v.V}, nil
+	case "bank_card_number":
+		var v struct {
+			V string `json:"bank_card_number"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextBankCardNumber{inner, v.V}, nil
+	case "mention":
+		var v struct {
+			V string `json:"username"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextMention{inner, v.V}, nil
+	case "hashtag":
+		var v struct {
+			V string `json:"hashtag"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextHashtag{inner, v.V}, nil
+	case "cashtag":
+		var v struct {
+			V string `json:"cashtag"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextCashtag{inner, v.V}, nil
+	case "bot_command":
+		var v struct {
+			V string `json:"bot_command"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextBotCommand{inner, v.V}, nil
+	case "anchor_link":
+		var v struct {
+			V string `json:"anchor_name"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextAnchorLink{inner, v.V}, nil
+	case "reference":
+		var v struct {
+			V string `json:"name"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextReference{inner, v.V}, nil
+	case "reference_link":
+		var v struct {
+			V string `json:"reference_name"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextReferenceLink{inner, v.V}, nil
+	case "date_time":
+		var v struct {
+			UnixTime       int64  `json:"unix_time"`
+			DateTimeFormat string `json:"date_time_format"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextDateTime{inner, v.UnixTime, v.DateTimeFormat}, nil
+	case "text_mention":
+		var v struct {
+			User User `json:"user"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextTextMention{inner, v.User}, nil
+
+	// --- leaves without text ---
+	case "custom_emoji":
+		var v struct {
+			ID  string `json:"custom_emoji_id"`
+			Alt string `json:"alternative_text"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextCustomEmoji{v.ID, v.Alt}, nil
+	case "mathematical_expression":
+		var v struct {
+			Expression string `json:"expression"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextMathematicalExpression{v.Expression}, nil
+	case "anchor":
+		var v struct {
+			Name string `json:"name"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichTextAnchor{v.Name}, nil
+
+	default:
+		// forward-compat: keep an unknown tag with a text field as
+		// RichTextWrap; without text it is an error (the shape cannot be guessed).
+		if inner != nil {
+			return RichTextWrap{Tag: head.Type, Text: inner}, nil
+		}
+		return nil, fmt.Errorf("richtext: unknown type %q", head.Type)
+	}
+}
+
+// UnmarshalRichBlock parses a single RichBlock from JSON, dispatching on the
+// type tag. Unknown types that carry a text field are decoded as RichBlockWrap
+// so their nested text remains usable; unmodeled fields are discarded.
+//
+// Since: Bot API 10.1
+func UnmarshalRichBlock(data []byte) (RichBlock, error) {
+	var head struct {
+		Type string          `json:"type"`
+		Text json.RawMessage `json:"text"`
+	}
+	if err := json.Unmarshal(data, &head); err != nil {
+		return nil, fmt.Errorf("richblock: %w", err)
+	}
+
+	if richBlockWrapTags[head.Type] {
+		text, err := parseOptRichText(head.Text)
+		if err != nil {
+			return nil, fmt.Errorf("richblock %q: text: %w", head.Type, err)
+		}
+		return RichBlockWrap{Tag: head.Type, Text: text}, nil
+	}
+
+	switch head.Type {
+	case "heading":
+		var v struct {
+			Size int `json:"size"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		text, err := parseOptRichText(head.Text)
+		if err != nil {
+			return nil, fmt.Errorf("richblock %q: text: %w", head.Type, err)
+		}
+		return RichBlockSectionHeading{text, v.Size}, nil
+
+	case "pre":
+		var v struct {
+			Language string `json:"language"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		text, err := parseOptRichText(head.Text)
+		if err != nil {
+			return nil, fmt.Errorf("richblock %q: text: %w", head.Type, err)
+		}
+		return RichBlockPreformatted{text, v.Language}, nil
+
+	case "blockquote":
+		var raw struct {
+			Blocks json.RawMessage `json:"blocks"`
+			Credit json.RawMessage `json:"credit"`
+		}
+		if err := json.Unmarshal(data, &raw); err != nil {
+			return nil, err
+		}
+		blocks, err := unmarshalRichBlocks(raw.Blocks)
+		if err != nil {
+			return nil, err
+		}
+		credit, err := parseOptRichText(raw.Credit)
+		if err != nil {
+			return nil, fmt.Errorf("richblock %q: credit: %w", head.Type, err)
+		}
+		return RichBlockQuotation{blocks, credit}, nil
+
+	case "pullquote":
+		var raw struct {
+			Credit json.RawMessage `json:"credit"`
+		}
+		if err := json.Unmarshal(data, &raw); err != nil {
+			return nil, err
+		}
+		text, err := parseOptRichText(head.Text)
+		if err != nil {
+			return nil, fmt.Errorf("richblock %q: text: %w", head.Type, err)
+		}
+		credit, err := parseOptRichText(raw.Credit)
+		if err != nil {
+			return nil, fmt.Errorf("richblock %q: credit: %w", head.Type, err)
+		}
+		return RichBlockPullQuotation{text, credit}, nil
+
+	case "list":
+		var v struct {
+			Items []RichBlockListItem `json:"items"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichBlockList{v.Items}, nil
+
+	case "collage":
+		var raw struct {
+			Blocks  json.RawMessage   `json:"blocks"`
+			Caption *RichBlockCaption `json:"caption"`
+		}
+		if err := json.Unmarshal(data, &raw); err != nil {
+			return nil, err
+		}
+		blocks, err := unmarshalRichBlocks(raw.Blocks)
+		if err != nil {
+			return nil, err
+		}
+		return RichBlockCollage{blocks, raw.Caption}, nil
+
+	case "slideshow":
+		var raw struct {
+			Blocks  json.RawMessage   `json:"blocks"`
+			Caption *RichBlockCaption `json:"caption"`
+		}
+		if err := json.Unmarshal(data, &raw); err != nil {
+			return nil, err
+		}
+		blocks, err := unmarshalRichBlocks(raw.Blocks)
+		if err != nil {
+			return nil, err
+		}
+		return RichBlockSlideshow{blocks, raw.Caption}, nil
+
+	case "details":
+		var raw struct {
+			Summary json.RawMessage `json:"summary"`
+			Blocks  json.RawMessage `json:"blocks"`
+			IsOpen  bool            `json:"is_open"`
+		}
+		if err := json.Unmarshal(data, &raw); err != nil {
+			return nil, err
+		}
+		summary, err := parseOptRichText(raw.Summary)
+		if err != nil {
+			return nil, fmt.Errorf("richblock %q: summary: %w", head.Type, err)
+		}
+		blocks, err := unmarshalRichBlocks(raw.Blocks)
+		if err != nil {
+			return nil, err
+		}
+		return RichBlockDetails{summary, blocks, raw.IsOpen}, nil
+
+	case "table":
+		var raw struct {
+			Cells      [][]RichBlockTableCell `json:"cells"`
+			IsBordered bool                   `json:"is_bordered"`
+			IsStriped  bool                   `json:"is_striped"`
+			Caption    json.RawMessage        `json:"caption"`
+		}
+		if err := json.Unmarshal(data, &raw); err != nil {
+			return nil, err
+		}
+		caption, err := parseOptRichText(raw.Caption)
+		if err != nil {
+			return nil, fmt.Errorf("richblock %q: caption: %w", head.Type, err)
+		}
+		return RichBlockTable{raw.Cells, raw.IsBordered, raw.IsStriped, caption}, nil
+
+	case "map":
+		var v struct {
+			Location Location          `json:"location"`
+			Zoom     int               `json:"zoom"`
+			Width    int               `json:"width"`
+			Height   int               `json:"height"`
+			Caption  *RichBlockCaption `json:"caption"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichBlockMap{v.Location, v.Zoom, v.Width, v.Height, v.Caption}, nil
+
+	case "photo":
+		var v struct {
+			Photo      []PhotoSize       `json:"photo"`
+			HasSpoiler bool              `json:"has_spoiler"`
+			Caption    *RichBlockCaption `json:"caption"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichBlockPhoto{v.Photo, v.HasSpoiler, v.Caption}, nil
+
+	case "video":
+		var v struct {
+			Video      Video             `json:"video"`
+			HasSpoiler bool              `json:"has_spoiler"`
+			Caption    *RichBlockCaption `json:"caption"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichBlockVideo{v.Video, v.HasSpoiler, v.Caption}, nil
+
+	case "audio":
+		var v struct {
+			Audio   Audio             `json:"audio"`
+			Caption *RichBlockCaption `json:"caption"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichBlockAudio{v.Audio, v.Caption}, nil
+
+	case "animation":
+		var v struct {
+			Animation  Animation         `json:"animation"`
+			HasSpoiler bool              `json:"has_spoiler"`
+			Caption    *RichBlockCaption `json:"caption"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichBlockAnimation{v.Animation, v.HasSpoiler, v.Caption}, nil
+
+	case "voice_note":
+		var v struct {
+			VoiceNote Voice             `json:"voice_note"`
+			Caption   *RichBlockCaption `json:"caption"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichBlockVoiceNote{v.VoiceNote, v.Caption}, nil
+
+	case "divider":
+		return RichBlockDivider{}, nil
+
+	case "mathematical_expression":
+		var v struct {
+			Expression string `json:"expression"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichBlockMathematicalExpression{v.Expression}, nil
+
+	case "anchor":
+		var v struct {
+			Name string `json:"name"`
+		}
+		if err := json.Unmarshal(data, &v); err != nil {
+			return nil, err
+		}
+		return RichBlockAnchor{v.Name}, nil
+
+	default:
+		// forward-compat: unknown type with text -> RichBlockWrap, without text -> error.
+		if text, err := parseOptRichText(head.Text); err == nil && text != nil {
+			return RichBlockWrap{Tag: head.Type, Text: text}, nil
+		}
+		return nil, fmt.Errorf("richblock: unknown type %q", head.Type)
+	}
+}
+
+// UnmarshalRichMessage parses a root RichMessage from JSON.
+//
+// Since: Bot API 10.1
+func UnmarshalRichMessage(data []byte) (RichMessage, error) {
+	var raw struct {
+		Blocks json.RawMessage `json:"blocks"`
+		IsRTL  bool            `json:"is_rtl"`
+	}
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return RichMessage{}, fmt.Errorf("richmessage: %w", err)
+	}
+	blocks, err := unmarshalRichBlocks(raw.Blocks)
+	if err != nil {
+		return RichMessage{}, err
+	}
+	return RichMessage{blocks, raw.IsRTL}, nil
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+//
+// Since: Bot API 10.1
+func (m *RichMessage) UnmarshalJSON(data []byte) error {
+	parsed, err := UnmarshalRichMessage(data)
+	if err != nil {
+		return err
+	}
+	*m = parsed
+	return nil
+}
+
+// ---------------------------------------------------------------------------
+// Internal helpers
+// ---------------------------------------------------------------------------
+
+// Optional RichText fields treat absent and null values as nil.
+func parseOptRichText(raw json.RawMessage) (RichText, error) {
+	if len(raw) == 0 || string(raw) == "null" {
+		return nil, nil
+	}
+	return UnmarshalRichText(raw)
+}
+
+func unmarshalRichBlocks(raw json.RawMessage) ([]RichBlock, error) {
+	if len(raw) == 0 || string(raw) == "null" {
+		return nil, nil
+	}
+	var raws []json.RawMessage
+	if err := json.Unmarshal(raw, &raws); err != nil {
+		return nil, err
+	}
+	blocks := make([]RichBlock, len(raws))
+	for i, r := range raws {
+		b, err := UnmarshalRichBlock(r)
+		if err != nil {
+			return nil, err
+		}
+		blocks[i] = b
+	}
+	return blocks, nil
+}

tgapi/rich_utils_test.go

@@ -0,0 +1,268 @@
+package tgapi
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+)
+
+func roundtripRichBlock(t *testing.T, in RichBlock) {
+	t.Helper()
+	b, err := json.Marshal(in)
+	if err != nil {
+		t.Fatalf("marshal: %v", err)
+	}
+	out, err := UnmarshalRichBlock(b)
+	if err != nil {
+		t.Fatalf("unmarshal %s: %v", b, err)
+	}
+	b2, err := json.Marshal(out)
+	if err != nil {
+		t.Fatalf("remarshal: %v", err)
+	}
+	if string(b) != string(b2) {
+		t.Fatalf("not stable:\n  %s\n  %s", b, b2)
+	}
+}
+
+func par(s string) RichBlockWrap { return RichBlockWrap{"paragraph", RichTextPlain(s)} }
+
+func TestRichBlockRoundtrip(t *testing.T) {
+	cases := []RichBlock{
+		// wrap blocks
+		par("Hello, world"),
+		RichBlockWrap{"footer", RichTextPlain("© 2024")},
+		RichBlockWrap{"thinking", RichTextPlain("Let me reason step by step.")},
+
+		// heading
+		RichBlockSectionHeading{RichTextWrap{"bold", RichTextPlain("Chapter 1")}, 1},
+		RichBlockSectionHeading{RichTextPlain("smallest"), 6},
+
+		// preformatted
+		RichBlockPreformatted{RichTextPlain(`fmt.Println("hi")`), "go"},
+		RichBlockPreformatted{Text: RichTextPlain("no language")},
+
+		// quotations
+		RichBlockQuotation{[]RichBlock{par("To be or not to be")}, RichTextPlain("Shakespeare")},
+		RichBlockQuotation{Blocks: []RichBlock{par("anonymous"), par("second block")}},
+		RichBlockPullQuotation{Text: RichTextPlain("Pull me")},
+		RichBlockPullQuotation{RichTextPlain("Wisdom"), RichTextWrap{"italic", RichTextPlain("someone")}},
+
+		// list: label is the ready-made marker, numbering lives on the items
+		RichBlockList{
+			Items: []RichBlockListItem{
+				{Label: "c.", Blocks: []RichBlock{par("item 3")}, Value: 3, Type: "a"},
+				{Label: "vii.", Blocks: []RichBlock{par("item 7")}, Value: 7, Type: "i"},
+			},
+		},
+		RichBlockList{
+			Items: []RichBlockListItem{
+				{Label: "•", Blocks: []RichBlock{par("todo")}, HasCheckbox: true},
+				{Label: "•", Blocks: []RichBlock{par("done")}, HasCheckbox: true, IsChecked: true},
+			},
+		},
+
+		// collage and slideshow
+		RichBlockCollage{
+			Blocks:  []RichBlock{RichBlockPhoto{Photo: []PhotoSize{{FileID: "abc123", Width: 100, Height: 100}}}},
+			Caption: &RichBlockCaption{Text: RichTextPlain("A photo")},
+		},
+		RichBlockSlideshow{
+			Blocks: []RichBlock{
+				RichBlockVideo{Video: Video{FileID: "vid1", Width: 640, Height: 480, Duration: 10}},
+			},
+		},
+
+		// details
+		RichBlockDetails{
+			Summary: RichTextPlain("Spoiler"),
+			Blocks:  []RichBlock{par("Hidden content")},
+		},
+		RichBlockDetails{
+			Summary: RichTextWrap{"bold", RichTextPlain("Open details")},
+			Blocks:  []RichBlock{RichBlockDivider{}, par("content")},
+			IsOpen:  true,
+		},
+
+		// table: text cells, headers, spans, alignment, invisible cell
+		RichBlockTable{
+			Cells: [][]RichBlockTableCell{
+				{
+					{Text: RichTextPlain("Name"), IsHeader: true, Align: "center"},
+					{Text: RichTextPlain("Score"), IsHeader: true, VAlign: "middle"},
+				},
+				{
+					{Text: RichTextPlain("Alice"), ColSpan: 2},
+				},
+				{
+					{}, // invisible cell
+					{Text: RichTextPlain("42"), RowSpan: 2},
+				},
+			},
+			IsBordered: true,
+			Caption:    RichTextPlain("Results"),
+		},
+
+		// map
+		RichBlockMap{
+			Location: Location{Latitude: 55.7558, Longitude: 37.6173},
+			Zoom:     13, Width: 800, Height: 400,
+			Caption: &RichBlockCaption{Text: RichTextPlain("Moscow"), Credit: RichTextPlain("OpenStreetMap")},
+		},
+
+		// media
+		RichBlockPhoto{
+			Photo:      []PhotoSize{{FileID: "p1", Width: 1280, Height: 720}},
+			HasSpoiler: true,
+			Caption:    &RichBlockCaption{Text: RichTextPlain("A cat"), Credit: RichTextWrap{"italic", RichTextPlain("photographer")}},
+		},
+		RichBlockVideo{Video: Video{FileID: "v1", Width: 1920, Height: 1080, Duration: 30}, HasSpoiler: true},
+		RichBlockAudio{
+			Audio:   Audio{FileID: "a1", Duration: 60},
+			Caption: &RichBlockCaption{Text: RichTextPlain("Podcast ep. 1")},
+		},
+		RichBlockAnimation{Animation: Animation{FileID: "g1", Width: 320, Height: 240, Duration: 2}},
+		RichBlockVoiceNote{VoiceNote: Voice{FileID: "vn1", Duration: 5}},
+
+		// leaves
+		RichBlockDivider{},
+		RichBlockMathematicalExpression{Expression: "E = mc^2"},
+		RichBlockAnchor{Name: "section-2"},
+	}
+	for _, c := range cases {
+		roundtripRichBlock(t, c)
+	}
+}
+
+func TestRichMessageRoundtrip(t *testing.T) {
+	for _, msg := range []RichMessage{
+		{
+			Blocks: []RichBlock{
+				RichBlockSectionHeading{RichTextPlain("Title"), 1},
+				RichBlockWrap{"paragraph", RichTextArray{RichTextPlain("Some "), RichTextWrap{"bold", RichTextPlain("bold")}, RichTextPlain(" text")}},
+				RichBlockDivider{},
+				RichBlockList{
+					Items: []RichBlockListItem{
+						{Label: "1.", Blocks: []RichBlock{par("First")}, Value: 1, Type: "1"},
+						{Label: "2.", Blocks: []RichBlock{par("Second")}, Value: 2, Type: "1"},
+					},
+				},
+				RichBlockPhoto{
+					Photo:   []PhotoSize{{FileID: "img1", Width: 10, Height: 10}},
+					Caption: &RichBlockCaption{Text: RichTextPlain("Fig. 1")},
+				},
+			},
+		},
+		{
+			Blocks: []RichBlock{par("שלום")},
+			IsRTL:  true,
+		},
+	} {
+		b, err := json.Marshal(msg)
+		if err != nil {
+			t.Fatalf("marshal: %v", err)
+		}
+		var out RichMessage
+		if err := json.Unmarshal(b, &out); err != nil {
+			t.Fatalf("unmarshal: %v", err)
+		}
+		b2, err := json.Marshal(out)
+		if err != nil {
+			t.Fatalf("remarshal: %v", err)
+		}
+		if string(b) != string(b2) {
+			t.Fatalf("not stable:\n  %s\n  %s", b, b2)
+		}
+	}
+}
+
+func TestRichBlockTags(t *testing.T) {
+	// tags per spec: heading, pre, blockquote, pullquote
+	cases := map[string]RichBlock{
+		"heading":    RichBlockSectionHeading{RichTextPlain("h"), 2},
+		"pre":        RichBlockPreformatted{Text: RichTextPlain("x")},
+		"blockquote": RichBlockQuotation{Blocks: []RichBlock{par("q")}},
+		"pullquote":  RichBlockPullQuotation{Text: RichTextPlain("p")},
+	}
+	for want, block := range cases {
+		b, _ := json.Marshal(block)
+		var m map[string]any
+		_ = json.Unmarshal(b, &m)
+		if m["type"] != want {
+			t.Fatalf("expected type %q, got %s", want, b)
+		}
+	}
+}
+
+func TestRichBlockOptionalFieldsOmitted(t *testing.T) {
+	// nil credit/caption and false flags must not appear in the JSON
+	for _, c := range []struct {
+		block RichBlock
+		bad   []string
+	}{
+		{RichBlockQuotation{Blocks: []RichBlock{par("q")}}, []string{"credit"}},
+		{RichBlockPullQuotation{Text: RichTextPlain("p")}, []string{"credit"}},
+		{RichBlockPhoto{Photo: []PhotoSize{{FileID: "p"}}}, []string{"caption", "has_spoiler"}},
+		{RichBlockTable{Cells: [][]RichBlockTableCell{}}, []string{"caption", "is_bordered", "is_striped"}},
+		{RichBlockDetails{Summary: RichTextPlain("s")}, []string{"is_open"}},
+	} {
+		b, _ := json.Marshal(c.block)
+		for _, key := range c.bad {
+			if strings.Contains(string(b), `"`+key+`"`) {
+				t.Fatalf("%T: %q must be omitted: %s", c.block, key, b)
+			}
+		}
+	}
+	// same for RichMessage.is_rtl
+	b, _ := json.Marshal(RichMessage{Blocks: []RichBlock{par("x")}})
+	if strings.Contains(string(b), "is_rtl") {
+		t.Fatalf("is_rtl must be omitted: %s", b)
+	}
+}
+
+func TestRichBlockDividerHasNoContent(t *testing.T) {
+	b, _ := json.Marshal(RichBlockDivider{})
+	var m map[string]any
+	_ = json.Unmarshal(b, &m)
+	if len(m) != 1 {
+		t.Fatalf("divider must only have type field: %s", b)
+	}
+	if m["type"] != "divider" {
+		t.Fatalf("unexpected type: %s", b)
+	}
+}
+
+func TestRichBlockUnknownTypeWithTextIsForwardCompat(t *testing.T) {
+	raw := []byte(`{"type":"future_tag","text":"hello"}`)
+	b, err := UnmarshalRichBlock(raw)
+	if err != nil {
+		t.Fatalf("forward-compat failed: %v", err)
+	}
+	w, ok := b.(RichBlockWrap)
+	if !ok || w.Tag != "future_tag" {
+		t.Fatalf("expected RichBlockWrap{future_tag}, got %T", b)
+	}
+}
+
+func TestRichBlockUnknownTypeWithoutTextIsError(t *testing.T) {
+	raw := []byte(`{"type":"mystery_leaf","value":42}`)
+	_, err := UnmarshalRichBlock(raw)
+	if err == nil {
+		t.Fatal("expected error for unknown type without text")
+	}
+}
+
+func TestUnmarshalRichBlockRejectsMalformedFields(t *testing.T) {
+	tests := []string{
+		`{"type":"heading","size":"large","text":"hello"}`,
+		`{"type":"blockquote","blocks":[],"credit":{"type":"date_time","text":"now","unix_time":"soon"}}`,
+		`{"type":"table","cells":[],"caption":{"type":"date_time","text":"now","unix_time":"soon"}}`,
+	}
+	for _, raw := range tests {
+		t.Run(raw, func(t *testing.T) {
+			if _, err := UnmarshalRichBlock([]byte(raw)); err == nil {
+				t.Fatal("expected malformed rich block to be rejected")
+			}
+		})
+	}
+}

tgapi/stickers_methods.go

@@ -10,6 +10,10 @@ type SendSticker struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Sticker             string `json:"sticker"`
 	Emoji               string `json:"emoji,omitempty"`

tgapi/types.go

@@ -63,6 +63,11 @@ const (
 
 	// UpdateTypeGuestMessage is a guest message update.
 	UpdateTypeGuestMessage UpdateType = "guest_message"
+
+	// UpdateTypeSubscription is a bot subscription update.
+	//
+	// Since: Bot API 10.2
+	UpdateTypeSubscription UpdateType = "subscription"
 )
 
 // Update represents an incoming update from Telegram.
@@ -101,6 +106,8 @@ type Update struct {
 	RemovedChatBoost *ChatBoostRemoved  `json:"removed_chat_boost,omitempty"` // Since: Bot API 7.0
 
 	ManagedBot *ManagedBotUpdated `json:"managed_bot,omitempty"` // Since: Bot API 9.6
+	// Subscription contains a bot subscription update.
+	Subscription *BotSubscriptionUpdated `json:"subscription,omitempty"` // Since: Bot API 10.2
 }
 
 // UnmarshalJSON decodes an update and derives its Type from the populated payload field.
@@ -168,6 +175,8 @@ func (u *Update) UnmarshalJSON(data []byte) error {
 		u.Type = UpdateTypeRemovedChatBoost
 	case u.ManagedBot != nil:
 		u.Type = UpdateTypeManagedBot
+	case u.Subscription != nil:
+		u.Type = UpdateTypeSubscription
 	default:
 		u.Type = UpdateTypeUnknown
 	}
@@ -255,6 +264,11 @@ type ChatJoinRequest struct {
 	Date       int64           `json:"date"`
 	Bio        *string         `json:"bio,omitempty"`
 	InviteLink *ChatInviteLink `json:"invite_link,omitempty"`
+
+	// QueryID identifies the join request query; present only for bots
+	// assigned to process join requests. When set, the bot must call
+	// SendChatJoinRequestWebApp or AnswerChatJoinRequestQuery within 10 seconds.
+	QueryID *string `json:"query_id,omitempty"` // Since: Bot API 10.1
 }
 
 // Location represents a point on the map.
@@ -552,8 +566,11 @@ type WriteAccessAllowed struct {
 type BackgroundFillType string
 
 const (
-	BackgroundFillSolidType            BackgroundFillType = "solid"
-	BackgroundFillGradientType         BackgroundFillType = "gradient"
+	// BackgroundFillSolidType identifies a solid fill.
+	BackgroundFillSolidType BackgroundFillType = "solid"
+	// BackgroundFillGradientType identifies a two-color gradient.
+	BackgroundFillGradientType BackgroundFillType = "gradient"
+	// BackgroundFillFreeformGradientType identifies a freeform gradient.
 	BackgroundFillFreeformGradientType BackgroundFillType = "freeform_gradient"
 )
 
@@ -576,9 +593,13 @@ type BackgroundFill struct {
 type BackgroundTypeType string
 
 const (
-	BackgroundTypeFillType      BackgroundTypeType = "fill"
+	// BackgroundTypeFillType identifies a generated fill.
+	BackgroundTypeFillType BackgroundTypeType = "fill"
+	// BackgroundTypeWallpaperType identifies a wallpaper.
 	BackgroundTypeWallpaperType BackgroundTypeType = "wallpaper"
-	BackgroundTypePatternType   BackgroundTypeType = "pattern"
+	// BackgroundTypePatternType identifies a pattern.
+	BackgroundTypePatternType BackgroundTypeType = "pattern"
+	// BackgroundTypeChatThemeType identifies a chat theme.
 	BackgroundTypeChatThemeType BackgroundTypeType = "chat_theme"
 )
 
@@ -599,3 +620,29 @@ type BackgroundType struct {
 
 	ThemeName string `json:"theme_name,omitempty"`
 }
+
+// BotSubscriptionState identifies the state of a user's subscription to the bot.
+//
+// Since: Bot API 10.2
+type BotSubscriptionState string
+
+const (
+	// BotSubscriptionCanceledState indicates that the user canceled the subscription.
+	BotSubscriptionCanceledState BotSubscriptionState = "canceled"
+	// BotSubscriptionActiveState indicates that the user re-enabled the subscription.
+	BotSubscriptionActiveState BotSubscriptionState = "active"
+	// BotSubscriptionFailedState indicates that subscription payment failed.
+	BotSubscriptionFailedState BotSubscriptionState = "failed"
+)
+
+// BotSubscriptionUpdated describes a change to a user's payment subscription to the bot.
+//
+// Since: Bot API 10.2
+type BotSubscriptionUpdated struct {
+	// User contains the user associated with the value.
+	User User `json:"user"`
+	// InvoicePayload contains the bot-defined subscription invoice payload.
+	InvoicePayload string `json:"invoice_payload"`
+	// State is the new subscription state.
+	State BotSubscriptionState `json:"state"`
+}

tgapi/types_test.go

@@ -72,6 +72,18 @@ func TestUpdateUnmarshalSetsType(t *testing.T) {
 			}`,
 			want: UpdateTypeManagedBot,
 		},
+		{
+			name: "subscription",
+			body: `{
+				"update_id": 6,
+				"subscription": {
+					"user": {"id": 13, "is_bot": false, "first_name": "Subscriber"},
+					"invoice_payload": "monthly",
+					"state": "active"
+				}
+			}`,
+			want: UpdateTypeSubscription,
+		},
 	}
 
 	for _, tt := range tests {
@@ -89,6 +101,9 @@ func TestUpdateUnmarshalSetsType(t *testing.T) {
 			if tt.want == UpdateTypeManagedBot && update.ManagedBot.Bot.ID != 12 {
 				t.Fatalf("unexpected managed bot id: got %d want %d", update.ManagedBot.Bot.ID, 12)
 			}
+			if tt.want == UpdateTypeSubscription && update.Subscription.User.ID != 13 {
+				t.Fatalf("unexpected subscription user id: got %d want %d", update.Subscription.User.ID, 13)
+			}
 		})
 	}
 }

tgapi/uploader_api.go

@@ -61,6 +61,15 @@ func (f UploaderFile) SetType(t UploaderFileType) UploaderFile {
 	return f
 }
 
+// SetAttachName sets the multipart field name used by an attach:// reference.
+// The name must match the suffix of the corresponding InputMedia.Media value.
+//
+// Since: Bot API 10.2
+func (f UploaderFile) SetAttachName(name string) UploaderFile {
+	f.field = UploaderFileType(name)
+	return f
+}
+
 // Uploader is a Telegram Bot API client specialized for multipart file uploads.
 //
 // Use Uploader methods when you need to upload binary files directly
@@ -155,7 +164,7 @@ func (r UploaderRequest[R, P]) doRequest(ctx context.Context, up *Uploader) (R,
 		if err != nil {
 			return zero, err
 		}
-		up.logger.Debugln("UPLOADER RES", url, string(body))
+		up.logger.Debugln("UPLOADER RES", responseLogSummary(r.method, len(body)))
 
 		response, err := parseBody[R](body)
 		if err != nil {
@@ -167,7 +176,7 @@ func (r UploaderRequest[R, P]) doRequest(ctx context.Context, up *Uploader) (R,
 				after := *response.Parameters.RetryAfter
 				up.logger.Warnf("Rate limited, retry after %d seconds (chat: %d)", after, r.chatID)
 				if up.api.Limiter != nil {
-					if r.chatID > 0 {
+					if r.chatID != 0 {
 						up.api.Limiter.SetChatLock(r.chatID, after)
 					} else {
 						up.api.Limiter.SetGlobalLock(after)

tgapi/uploader_api_test.go

@@ -1,6 +1,7 @@
 package tgapi
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"io"
@@ -105,6 +106,17 @@ func TestUploaderEncodesJSONFieldsAndLeavesAcceptEncodingToHTTPTransport(t *test
 	}
 }
 
+func TestUploaderRejectsDirectRichMessageDraftUpload(t *testing.T) {
+	uploader := &Uploader{}
+	_, err := uploader.SendRichMessageDraft(
+		SendRichMessageDraft{ChatID: 42, DraftID: 1},
+		NewUploaderFile("photo.jpg", []byte("photo")),
+	)
+	if !errors.Is(err, ErrRichMessageDraftUploadUnsupported) {
+		t.Fatalf("expected ErrRichMessageDraftUploadUnsupported, got %v", err)
+	}
+}
+
 func TestUploaderSurfacesResponseErrorForTelegramFailure(t *testing.T) {
 	const responseBody = `{"ok":false,"error_code":400,"description":"Bad Request: chat not found"}`
 
@@ -177,6 +189,141 @@ func TestNewUploaderFileDetectsFileTypeCaseInsensitively(t *testing.T) {
 	}
 }
 
+func TestUploaderSendLivePhotoUsesRequiredMultipartFields(t *testing.T) {
+	tests := []struct {
+		name string
+		send func(*Uploader) (Message, error)
+	}{
+		{
+			name: "background context",
+			send: func(uploader *Uploader) (Message, error) {
+				return uploader.SendLivePhoto(
+					UploadLivePhoto{ChatID: 42},
+					NewUploaderFile("live.mp4", []byte("video")),
+					NewUploaderFile("photo.jpg", []byte("image")),
+				)
+			},
+		},
+		{
+			name: "explicit context",
+			send: func(uploader *Uploader) (Message, error) {
+				return uploader.SendLivePhotoWithContext(
+					context.Background(),
+					UploadLivePhoto{ChatID: 42},
+					NewUploaderFile("live.mp4", []byte("video")),
+					NewUploaderFile("photo.jpg", []byte("image")),
+				)
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var (
+				gotPath  string
+				gotFiles map[string]multipartFile
+				parseErr error
+			)
+			client := &http.Client{
+				Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+					gotPath = req.URL.Path
+					gotFiles, parseErr = readMultipartFiles(req)
+					return &http.Response{
+						StatusCode: http.StatusOK,
+						Header:     http.Header{"Content-Type": []string{"application/json"}},
+						Body:       io.NopCloser(strings.NewReader(`{"ok":true,"result":{"message_id":5,"date":1}}`)),
+					}, nil
+				}),
+			}
+			api := NewAPI(
+				NewAPIOpts("token").
+					SetAPIURL("https://example.test").
+					SetHTTPClient(client),
+			)
+			defer func() {
+				if err := api.Close(); err != nil {
+					t.Errorf("Close API returned error: %v", err)
+				}
+			}()
+			uploader := NewUploader(api)
+			defer func() {
+				if err := uploader.Close(); err != nil {
+					t.Errorf("Close uploader returned error: %v", err)
+				}
+			}()
+
+			if _, err := tt.send(uploader); err != nil {
+				t.Fatalf("SendLivePhoto returned error: %v", err)
+			}
+			if parseErr != nil {
+				t.Fatalf("multipart parse failed: %v", parseErr)
+			}
+			if gotPath != "/bottoken/sendLivePhoto" {
+				t.Fatalf("unexpected request path: %q", gotPath)
+			}
+			assertMultipartFile(t, gotFiles, "live_photo", "live.mp4", "video")
+			assertMultipartFile(t, gotFiles, "photo", "photo.jpg", "image")
+		})
+	}
+}
+
+func TestPrepareMultipartRichMessageUsesAttachName(t *testing.T) {
+	params := SendRichMessage{
+		ChatID: 42,
+		RichMessage: InputRichMessage{Blocks: []InputRichBlock{
+			InputRichBlockAnimation{
+				Type:      InputRichTypeAnimation,
+				Animation: InputMedia{Type: InputMediaTypeAnimation, Media: "attach://animation"},
+			},
+		}},
+	}
+
+	buf, contentType, err := prepareMultipart(
+		[]UploaderFile{NewUploaderFile("animation.mp4", []byte("animation")).SetAttachName("animation")},
+		params,
+	)
+	if err != nil {
+		t.Fatalf("prepareMultipart returned error: %v", err)
+	}
+
+	_, contentTypeParams, err := mime.ParseMediaType(contentType)
+	if err != nil {
+		t.Fatalf("ParseMediaType returned error: %v", err)
+	}
+	reader := multipart.NewReader(buf, contentTypeParams["boundary"])
+
+	parts := make(map[string]string)
+	var fileData []byte
+	for {
+		part, err := reader.NextPart()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			t.Fatalf("NextPart returned error: %v", err)
+		}
+		data, err := io.ReadAll(part)
+		if err != nil {
+			t.Fatalf("ReadAll returned error: %v", err)
+		}
+		if part.FileName() != "" {
+			if part.FormName() != "animation" {
+				t.Errorf("file form name = %q, want animation", part.FormName())
+			}
+			fileData = data
+			continue
+		}
+		parts[part.FormName()] = string(data)
+	}
+
+	if string(fileData) != "animation" {
+		t.Errorf("file data = %q, want animation", fileData)
+	}
+	if got := parts["rich_message"]; !strings.Contains(got, `"media":"attach://animation"`) {
+		t.Errorf("rich_message = %s, want attach reference", got)
+	}
+}
+
 func readMultipartRequest(req *http.Request) (map[string]string, string, []byte, error) {
 	_, params, err := mime.ParseMediaType(req.Header.Get("Content-Type"))
 	if err != nil {
@@ -209,3 +356,48 @@ func readMultipartRequest(req *http.Request) (map[string]string, string, []byte,
 		fields[part.FormName()] = string(data)
 	}
 }
+
+type multipartFile struct {
+	name string
+	data string
+}
+
+func readMultipartFiles(req *http.Request) (map[string]multipartFile, error) {
+	_, params, err := mime.ParseMediaType(req.Header.Get("Content-Type"))
+	if err != nil {
+		return nil, err
+	}
+	reader := multipart.NewReader(req.Body, params["boundary"])
+	files := make(map[string]multipartFile)
+	for {
+		part, err := reader.NextPart()
+		if err == io.EOF {
+			return files, nil
+		}
+		if err != nil {
+			return nil, err
+		}
+		if part.FileName() == "" {
+			continue
+		}
+		data, err := io.ReadAll(part)
+		if err != nil {
+			return nil, err
+		}
+		files[part.FormName()] = multipartFile{name: part.FileName(), data: string(data)}
+	}
+}
+
+func assertMultipartFile(t *testing.T, files map[string]multipartFile, field, name, data string) {
+	t.Helper()
+	file, ok := files[field]
+	if !ok {
+		t.Fatalf("multipart field %q is missing", field)
+	}
+	if file.name != name {
+		t.Errorf("multipart field %q filename = %q, want %q", field, file.name, name)
+	}
+	if file.data != data {
+		t.Errorf("multipart field %q data = %q, want %q", field, file.data, data)
+	}
+}

tgapi/uploader_methods.go

@@ -2,6 +2,45 @@ package tgapi
 
 import "context"
 
+// SendRichMessage uploads files referenced by attach:// names in params.RichMessage
+// and sends the rich message.
+//
+// Since: Bot API 10.2
+func (u *Uploader) SendRichMessage(params SendRichMessage, files ...UploaderFile) (Message, error) {
+	req := NewUploaderRequestWithChatID[Message]("sendRichMessage", params, params.ChatID, files...)
+	return req.Do(u)
+}
+
+// SendRichMessageWithContext uploads files referenced by attach:// names in params.RichMessage
+// and sends the rich message using ctx for cancellation and deadlines.
+//
+// Since: Bot API 10.2
+func (u *Uploader) SendRichMessageWithContext(ctx context.Context, params SendRichMessage, files ...UploaderFile) (Message, error) {
+	req := NewUploaderRequestWithChatID[Message]("sendRichMessage", params, params.ChatID, files...)
+	return req.DoWithContext(ctx, u)
+}
+
+// SendRichMessageDraft streams a rich-message draft without direct file uploads.
+// It returns ErrRichMessageDraftUploadUnsupported when files is non-empty.
+//
+// Since: Bot API 10.2
+func (u *Uploader) SendRichMessageDraft(params SendRichMessageDraft, files ...UploaderFile) (bool, error) {
+	if len(files) > 0 {
+		return false, ErrRichMessageDraftUploadUnsupported
+	}
+	return u.api.SendRichMessageDraft(params)
+}
+
+// SendRichMessageDraftWithContext is the context-aware variant of SendRichMessageDraft.
+//
+// Since: Bot API 10.2
+func (u *Uploader) SendRichMessageDraftWithContext(ctx context.Context, params SendRichMessageDraft, files ...UploaderFile) (bool, error) {
+	if len(files) > 0 {
+		return false, ErrRichMessageDraftUploadUnsupported
+	}
+	return u.api.SendRichMessageDraftWithContext(ctx, params)
+}
+
 // UploadPhoto holds parameters for uploading a photo using the Uploader.
 // Since: Bot API 1.0
 // See https://core.telegram.org/bots/api#sendphoto
@@ -10,6 +49,10 @@ type UploadPhoto struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Caption         string          `json:"caption,omitempty"`
 	ParseMode       ParseMode       `json:"parse_mode,omitempty"`
@@ -53,6 +96,10 @@ type UploadAudio struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Caption         string          `json:"caption,omitempty"`
 	ParseMode       ParseMode       `json:"parse_mode,omitempty"`
@@ -98,6 +145,10 @@ type UploadDocument struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Caption         string          `json:"caption,omitempty"`
 	ParseMode       ParseMode       `json:"parse_mode,omitempty"`
@@ -140,6 +191,10 @@ type UploadVideo struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Duration int `json:"duration,omitempty"`
 	Width    int `json:"width,omitempty"`
@@ -189,6 +244,10 @@ type UploadAnimation struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Duration int `json:"duration,omitempty"`
 	Width    int `json:"width,omitempty"`
@@ -236,6 +295,10 @@ type UploadVoice struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Caption         string          `json:"caption,omitempty"`
 	ParseMode       ParseMode       `json:"parse_mode,omitempty"`
@@ -278,6 +341,10 @@ type UploadVideoNote struct {
 	ChatID                int64  `json:"chat_id"`
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 
 	Duration int `json:"duration,omitempty"`
 	Length   int `json:"length,omitempty"`
@@ -375,6 +442,10 @@ type UploadLivePhoto struct {
 	MessageThreadID       int    `json:"message_thread_id,omitempty"`
 	DirectMessagesTopicID int    `json:"direct_messages_topic_id,omitempty"`
 
+	// ReceiverUserID identifies the user who can see the ephemeral message.
+	ReceiverUserID int64 `json:"receiver_user_id,omitempty"` // Since: Bot API 10.2
+	// CallbackQueryID identifies the callback query that triggered an ephemeral response.
+	CallbackQueryID string          `json:"callback_query_id,omitempty"` // Since: Bot API 10.2
 	Caption         string          `json:"caption,omitempty"`
 	ParseMode       ParseMode       `json:"parse_mode,omitempty"`
 	CaptionEntities []MessageEntity `json:"caption_entities,omitempty"`
@@ -391,20 +462,30 @@ type UploadLivePhoto struct {
 	ReplyMarkup             *ReplyMarkup             `json:"reply_markup,omitempty"`
 }
 
-// SendLivePhoto uploads a live photo via multipart and sends it as a message.
+// SendLivePhoto uploads a live-photo video and its static image via multipart.
+// livePhoto is sent in the live_photo field and photo in the photo field.
 // Since: Bot API 10.0
-// file is the live photo file to upload.
 // See https://core.telegram.org/bots/api#sendlivephoto
-func (u *Uploader) SendLivePhoto(params UploadLivePhoto, file UploaderFile) (Message, error) {
-	req := NewUploaderRequestWithChatID[Message]("sendLivePhoto", params, params.ChatID, file.SetType(UploaderLivePhotoType))
+func (u *Uploader) SendLivePhoto(params UploadLivePhoto, livePhoto, photo UploaderFile) (Message, error) {
+	req := NewUploaderRequestWithChatID[Message](
+		"sendLivePhoto", params, params.ChatID,
+		livePhoto.SetType(UploaderLivePhotoType),
+		photo.SetType(UploaderPhotoType),
+	)
 	return req.Do(u)
 }
 
-// SendLivePhotoWithContext is the context-aware variant of SendLivePhoto.
+// SendLivePhotoWithContext uploads a live-photo video and its static image via
+// multipart using ctx for cancellation and deadlines.
 // Since: Bot API 10.0
-// It executes the same request but uses ctx for cancellation and deadlines.
 // See https://core.telegram.org/bots/api#sendlivephoto
-func (u *Uploader) SendLivePhotoWithContext(ctx context.Context, params UploadLivePhoto, file UploaderFile) (Message, error) {
-	req := NewUploaderRequestWithChatID[Message]("sendLivePhoto", params, params.ChatID, file.SetType(UploaderLivePhotoType))
+func (u *Uploader) SendLivePhotoWithContext(
+	ctx context.Context, params UploadLivePhoto, livePhoto, photo UploaderFile,
+) (Message, error) {
+	req := NewUploaderRequestWithChatID[Message](
+		"sendLivePhoto", params, params.ChatID,
+		livePhoto.SetType(UploaderLivePhotoType),
+		photo.SetType(UploaderPhotoType),
+	)
 	return req.DoWithContext(ctx, u)
 }

tgapi/users_types.go

@@ -22,6 +22,10 @@ type User struct {
 	AllowsUsersToCreateTopics *bool   `json:"allows_users_to_create_topics,omitempty"` // Since: Bot API 9.4
 	CanManageBots             *bool   `json:"can_manage_bots,omitempty"`               // Since: Bot API 9.6
 	SupportsGuestQueries      *bool   `json:"supports_guest_queries,omitempty"`        // Since: Bot API 10.0
+
+	// SupportsJoinRequestQueries reports that the bot supports join request
+	// queries and can be assigned to process them. Returned only in getMe.
+	SupportsJoinRequestQueries *bool `json:"supports_join_request_queries,omitempty"` // Since: Bot API 10.1
 }
 
 // UserProfilePhotos represents a user's profile photos.

tgfmt/html.go

@@ -2,7 +2,6 @@ package tgfmt
 
 import (
 	"strconv"
-	"strings"
 )
 
 // HTML is an escaped Telegram HTML fragment.
@@ -11,43 +10,25 @@ import (
 type HTML string
 
 // EscapeHTML escapes special characters for Telegram HTML parse mode.
-func EscapeHTML(s string) HTML {
-	s = strings.ReplaceAll(s, "&", "&")
-	s = strings.ReplaceAll(s, "<", "&lt;")
-	s = strings.ReplaceAll(s, ">", "&gt;")
-	s = strings.ReplaceAll(s, `"`, "&quot;")
-	return HTML(s)
-}
+func EscapeHTML(s string) HTML { return HTML(escapeHTML(s)) }
 
 // Bold returns h wrapped as bold Telegram HTML text.
-func (h HTML) Bold() HTML {
-	return "<b>" + h + "</b>"
-}
+func (h HTML) Bold() HTML { return "<b>" + h + "</b>" }
 
 // Italic returns h wrapped as italic Telegram HTML text.
-func (h HTML) Italic() HTML {
-	return "<i>" + h + "</i>"
-}
+func (h HTML) Italic() HTML { return "<i>" + h + "</i>" }
 
 // Underline returns h wrapped as underlined Telegram HTML text.
-func (h HTML) Underline() HTML {
-	return "<u>" + h + "</u>"
-}
+func (h HTML) Underline() HTML { return "<u>" + h + "</u>" }
 
 // Strikethrough returns h wrapped as strikethrough Telegram HTML text.
-func (h HTML) Strikethrough() HTML {
-	return "<s>" + h + "</s>"
-}
+func (h HTML) Strikethrough() HTML { return "<s>" + h + "</s>" }
 
 // Spoiler returns h wrapped as spoiler Telegram HTML text.
-func (h HTML) Spoiler() HTML {
-	return "<tg-spoiler>" + h + "</tg-spoiler>"
-}
+func (h HTML) Spoiler() HTML { return "<tg-spoiler>" + h + "</tg-spoiler>" }
 
 // Link returns h as a Telegram HTML text link.
-func (h HTML) Link(url string) HTML {
-	return `<a href="` + escapeHTMLAttr(url) + `">` + h + "</a>"
-}
+func (h HTML) Link(url string) HTML { return `<a href="` + escapeHTMLAttr(url) + `">` + h + "</a>" }
 
 // Mention returns h as a Telegram HTML user mention.
 func (h HTML) Mention(userID int64) HTML {
@@ -70,14 +51,10 @@ func (h HTML) TimeFormat(unix int64, format string) HTML {
 }
 
 // InlineCode returns h wrapped as inline code Telegram HTML text.
-func (h HTML) InlineCode() HTML {
-	return "<code>" + h + "</code>"
-}
+func (h HTML) InlineCode() HTML { return "<code>" + h + "</code>" }
 
 // BlockCode returns h wrapped as a Telegram HTML code block.
-func (h HTML) BlockCode() HTML {
-	return "<pre>" + h + "</pre>"
-}
+func (h HTML) BlockCode() HTML { return "<pre>" + h + "</pre>" }
 
 // BlockCodeLanguage returns h wrapped as a Telegram HTML code block with language.
 func (h HTML) BlockCodeLanguage(lang string) HTML {
@@ -85,15 +62,9 @@ func (h HTML) BlockCodeLanguage(lang string) HTML {
 }
 
 // Quote returns h as a Telegram HTML blockquote.
-func (h HTML) Quote() HTML {
-	return "<blockquote>" + h + "</blockquote>"
-}
+func (h HTML) Quote() HTML { return "<blockquote>" + h + "</blockquote>" }
 
 // QuoteExpandable returns h as a Telegram HTML expandable blockquote.
-func (h HTML) QuoteExpandable() HTML {
-	return "<blockquote expandable>" + h + "</blockquote>"
-}
+func (h HTML) QuoteExpandable() HTML { return "<blockquote expandable>" + h + "</blockquote>" }
 
-func escapeHTMLAttr(s string) HTML {
-	return EscapeHTML(s)
-}
+func escapeHTMLAttr(s string) HTML { return HTML(escapeHTML(s)) }

tgfmt/md.go

@@ -2,7 +2,6 @@ package tgfmt
 
 import (
 	"strconv"
-	"strings"
 )
 
 // Markdown is an escaped legacy Telegram Markdown fragment.
@@ -13,27 +12,16 @@ type Markdown string
 // EscapeMarkdown escapes special characters for legacy Telegram Markdown.
 //
 // Deprecated: Use EscapeMarkdownV2 instead.
-func EscapeMarkdown(s string) Markdown {
-	s = strings.ReplaceAll(s, "_", `\_`)
-	s = strings.ReplaceAll(s, "*", `\*`)
-	s = strings.ReplaceAll(s, "[", `\[`)
-	return Markdown(strings.ReplaceAll(s, "`", "\\`"))
-}
+func EscapeMarkdown(s string) Markdown { return Markdown(escapeMD(s)) }
 
 // Bold returns s wrapped as bold legacy Telegram Markdown text.
-func (s Markdown) Bold() Markdown {
-	return "*" + s + "*"
-}
+func (s Markdown) Bold() Markdown { return "*" + s + "*" }
 
 // Italic returns s wrapped as italic legacy Telegram Markdown text.
-func (s Markdown) Italic() Markdown {
-	return "_" + s + "_"
-}
+func (s Markdown) Italic() Markdown { return "_" + s + "_" }
 
 // Link returns s as a legacy Telegram Markdown text link.
-func (s Markdown) Link(url string) Markdown {
-	return "[" + s + "](" + Markdown(url) + ")"
-}
+func (s Markdown) Link(url string) Markdown { return "[" + s + "](" + Markdown(url) + ")" }
 
 // Mention returns s as a legacy Telegram Markdown user mention.
 func (s Markdown) Mention(userID int64) Markdown {
@@ -41,14 +29,10 @@ func (s Markdown) Mention(userID int64) Markdown {
 }
 
 // InlineCode returns s wrapped as inline code legacy Telegram Markdown text.
-func (s Markdown) InlineCode() Markdown {
-	return "`" + s + "`"
-}
+func (s Markdown) InlineCode() Markdown { return "`" + s + "`" }
 
 // BlockCode returns s wrapped as a legacy Telegram Markdown code block.
-func (s Markdown) BlockCode() Markdown {
-	return "```\n" + s + "\n```"
-}
+func (s Markdown) BlockCode() Markdown { return "```\n" + s + "\n```" }
 
 // BlockCodeLanguage returns s wrapped as a legacy Telegram Markdown code block.
 func (s Markdown) BlockCodeLanguage(lang string) Markdown {

tgfmt/mdv2.go

@@ -12,38 +12,22 @@ type MarkdownV2 string
 
 // EscapeMarkdownV2 escapes special characters for Telegram MarkdownV2.
 // https://core.telegram.org/bots/api#markdownv2-style
-func EscapeMarkdownV2(s string) MarkdownV2 {
-	symbols := []string{"\\", "_", "*", "[", "]", "(", ")", "~", "`", ">", "#", "+", "-", "=", "|", "{", "}", ".", "!"}
-	for _, symbol := range symbols {
-		s = strings.ReplaceAll(s, symbol, "\\"+symbol)
-	}
-	return MarkdownV2(s)
-}
+func EscapeMarkdownV2(s string) MarkdownV2 { return MarkdownV2(escapeMDv2(s)) }
 
 // Bold returns s wrapped as bold Telegram MarkdownV2 text.
-func (s MarkdownV2) Bold() MarkdownV2 {
-	return "*" + s + "*"
-}
+func (s MarkdownV2) Bold() MarkdownV2 { return "*" + s + "*" }
 
 // Italic returns s wrapped as italic Telegram MarkdownV2 text.
-func (s MarkdownV2) Italic() MarkdownV2 {
-	return "_" + s + "_"
-}
+func (s MarkdownV2) Italic() MarkdownV2 { return "_" + s + "_" }
 
 // Underline returns s wrapped as underlined Telegram MarkdownV2 text.
-func (s MarkdownV2) Underline() MarkdownV2 {
-	return "__" + s + "__"
-}
+func (s MarkdownV2) Underline() MarkdownV2 { return "__" + s + "__" }
 
 // Strikethrough returns s wrapped as strikethrough Telegram MarkdownV2 text.
-func (s MarkdownV2) Strikethrough() MarkdownV2 {
-	return "~" + s + "~"
-}
+func (s MarkdownV2) Strikethrough() MarkdownV2 { return "~" + s + "~" }
 
 // Spoiler returns s wrapped as spoiler Telegram MarkdownV2 text.
-func (s MarkdownV2) Spoiler() MarkdownV2 {
-	return "||" + s + "||"
-}
+func (s MarkdownV2) Spoiler() MarkdownV2 { return "||" + s + "||" }
 
 // Link returns s as a Telegram MarkdownV2 text link.
 func (s MarkdownV2) Link(url string) MarkdownV2 {
@@ -72,14 +56,10 @@ func (s MarkdownV2) TimeFormat(unix uint64, format string) MarkdownV2 {
 }
 
 // InlineCode returns s wrapped as inline code Telegram MarkdownV2 text.
-func (s MarkdownV2) InlineCode() MarkdownV2 {
-	return "`" + s + "`"
-}
+func (s MarkdownV2) InlineCode() MarkdownV2 { return "`" + s + "`" }
 
 // BlockCode returns s wrapped as a Telegram MarkdownV2 code block.
-func (s MarkdownV2) BlockCode() MarkdownV2 {
-	return "```\n" + s + "\n```"
-}
+func (s MarkdownV2) BlockCode() MarkdownV2 { return "```\n" + s + "\n```" }
 
 // BlockCodeLanguage returns s wrapped as a Telegram MarkdownV2 code block with language.
 func (s MarkdownV2) BlockCodeLanguage(lang string) MarkdownV2 {
@@ -92,9 +72,7 @@ func (s MarkdownV2) Quote() MarkdownV2 {
 }
 
 // QuoteExpandable returns s as a Telegram MarkdownV2 expandable blockquote.
-func (s MarkdownV2) QuoteExpandable() MarkdownV2 {
-	return "**>" + s
-}
+func (s MarkdownV2) QuoteExpandable() MarkdownV2 { return "**>" + s }
 
 func escapeMarkdownV2LinkDestination(s string) MarkdownV2 {
 	s = strings.ReplaceAll(s, "\\", "\\\\")

tgfmt/utils.go

@@ -1,6 +1,31 @@
 package tgfmt
 
-import "strings"
+import (
+	"strings"
+)
+
+func escapeHTML(s string) string {
+	s = strings.ReplaceAll(s, "&", "&")
+	s = strings.ReplaceAll(s, "<", "&lt;")
+	s = strings.ReplaceAll(s, ">", "&gt;")
+	s = strings.ReplaceAll(s, `"`, "&quot;")
+	return s
+}
+
+func escapeMD(s string) string {
+	s = strings.ReplaceAll(s, "_", `\_`)
+	s = strings.ReplaceAll(s, "*", `\*`)
+	s = strings.ReplaceAll(s, "[", `\[`)
+	s = strings.ReplaceAll(s, "`", "\\`")
+	return s
+}
+func escapeMDv2(s string) string {
+	symbols := []string{"\\", "_", "*", "[", "]", "(", ")", "~", "`", ">", "#", "+", "-", "=", "|", "{", "}", ".", "!"}
+	for _, symbol := range symbols {
+		s = strings.ReplaceAll(s, symbol, "\\"+symbol)
+	}
+	return s
+}
 
 // EscapePunctuation escapes '.', '!' and '-' for MarkdownV2 fragments.
 func EscapePunctuation(s string) string {

tgrich/ast.go

@@ -0,0 +1,191 @@
+package tgrich
+
+import (
+	"time"
+
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+)
+
+const (
+	maxRichTextChars = 32768
+	maxRichBlocks    = 500
+	maxRichDepth     = 16
+	maxRichMedia     = 50
+	maxTableColumns  = 20
+)
+
+// Text creates a plain rich-text node.
+//
+// Since: Bot API 10.1
+func Text(s string) tgapi.RichText { return tgapi.RichTextPlain(s) }
+
+// Bold applies bold formatting to t.
+//
+// Since: Bot API 10.1
+func Bold(t tgapi.RichText) tgapi.RichText { return tgapi.RichTextWrap{Tag: "bold", Text: t} }
+
+// Italic applies italic formatting to t.
+//
+// Since: Bot API 10.1
+func Italic(t tgapi.RichText) tgapi.RichText { return tgapi.RichTextWrap{Tag: "italic", Text: t} }
+
+// Underline applies underline formatting to t.
+//
+// Since: Bot API 10.1
+func Underline(t tgapi.RichText) tgapi.RichText { return tgapi.RichTextWrap{Tag: "underline", Text: t} }
+
+// Strikethrough applies strikethrough formatting to t.
+//
+// Since: Bot API 10.1
+func Strikethrough(t tgapi.RichText) tgapi.RichText {
+	return tgapi.RichTextWrap{Tag: "strikethrough", Text: t}
+}
+
+// Spoiler hides t behind a spoiler.
+//
+// Since: Bot API 10.1
+func Spoiler(t tgapi.RichText) tgapi.RichText { return tgapi.RichTextWrap{Tag: "spoiler", Text: t} }
+
+// DateTime associates t with ts using Telegram's default date-time format.
+//
+// Since: Bot API 10.1
+func DateTime(t tgapi.RichText, ts time.Time) tgapi.RichText {
+	return tgapi.RichTextDateTime{Text: t, UnixTime: ts.Unix()}
+}
+
+// DateTimeWithFormat associates t with ts using format.
+//
+// Since: Bot API 10.1
+func DateTimeWithFormat(t tgapi.RichText, ts time.Time, format string) tgapi.RichText {
+	return tgapi.RichTextDateTime{Text: t, UnixTime: ts.Unix(), DateTimeFormat: format}
+}
+
+// TextMention mentions u with the display text t.
+//
+// Since: Bot API 10.1
+func TextMention(t tgapi.RichText, u tgapi.User) tgapi.RichText {
+	return tgapi.RichTextTextMention{Text: t, User: u}
+}
+
+// Subscript applies subscript formatting to t.
+//
+// Since: Bot API 10.1
+func Subscript(t tgapi.RichText) tgapi.RichText { return tgapi.RichTextWrap{Tag: "subscript", Text: t} }
+
+// Superscript applies superscript formatting to t.
+//
+// Since: Bot API 10.1
+func Superscript(t tgapi.RichText) tgapi.RichText {
+	return tgapi.RichTextWrap{Tag: "superscript", Text: t}
+}
+
+// Marked highlights t.
+//
+// Since: Bot API 10.1
+func Marked(t tgapi.RichText) tgapi.RichText { return tgapi.RichTextWrap{Tag: "marked", Text: t} }
+
+// Code applies monospaced formatting to t.
+//
+// Since: Bot API 10.1
+func Code(t tgapi.RichText) tgapi.RichText { return tgapi.RichTextWrap{Tag: "code", Text: t} }
+
+// Emoji creates a custom emoji with emojiID and alternative text t.
+//
+// Since: Bot API 10.1
+func Emoji(t, emojiID string) tgapi.RichText {
+	return tgapi.RichTextCustomEmoji{CustomEmojiID: emojiID, AlternativeText: t}
+}
+
+// MathExpression creates an inline LaTeX expression.
+//
+// Since: Bot API 10.1
+func MathExpression(exp string) tgapi.RichTextMathematicalExpression {
+	return tgapi.RichTextMathematicalExpression{Expression: exp}
+}
+
+// URL links t to url.
+//
+// Since: Bot API 10.1
+func URL(t tgapi.RichText, url string) tgapi.RichTextURL { return tgapi.RichTextURL{Text: t, URL: url} }
+
+// Email marks t as an email address.
+//
+// Since: Bot API 10.1
+func Email(t tgapi.RichText, email string) tgapi.RichTextEmailAddress {
+	return tgapi.RichTextEmailAddress{Text: t, EmailAddress: email}
+}
+
+// Phone marks t as a phone number.
+//
+// Since: Bot API 10.1
+func Phone(t tgapi.RichText, phone string) tgapi.RichTextPhoneNumber {
+	return tgapi.RichTextPhoneNumber{Text: t, PhoneNumber: phone}
+}
+
+// BankCardNumber marks t as a bank card number.
+//
+// Since: Bot API 10.1
+func BankCardNumber(t tgapi.RichText, number string) tgapi.RichTextBankCardNumber {
+	return tgapi.RichTextBankCardNumber{Text: t, BankCardNumber: number}
+}
+
+// Mention marks t as a mention of username.
+//
+// Since: Bot API 10.1
+func Mention(t tgapi.RichText, username string) tgapi.RichTextMention {
+	return tgapi.RichTextMention{Text: t, Username: username}
+}
+
+// Hashtag marks t as hashtag.
+//
+// Since: Bot API 10.1
+func Hashtag(t tgapi.RichText, hashtag string) tgapi.RichTextHashtag {
+	return tgapi.RichTextHashtag{Text: t, Hashtag: hashtag}
+}
+
+// Cashtag marks t as cashtag.
+//
+// Since: Bot API 10.1
+func Cashtag(t tgapi.RichText, cashtag string) tgapi.RichTextCashtag {
+	return tgapi.RichTextCashtag{Text: t, Cashtag: cashtag}
+}
+
+// BotCommand marks t as command.
+//
+// Since: Bot API 10.1
+func BotCommand(t tgapi.RichText, command string) tgapi.RichTextBotCommand {
+	return tgapi.RichTextBotCommand{Text: t, BotCommand: command}
+}
+
+// TextAnchor creates an inline anchor named name.
+//
+// Since: Bot API 10.1
+func TextAnchor(name string) tgapi.RichTextAnchor {
+	return tgapi.RichTextAnchor{Name: name}
+}
+
+// AnchorLink links t to the anchor named name.
+//
+// Since: Bot API 10.1
+func AnchorLink(t tgapi.RichText, name string) tgapi.RichTextAnchorLink {
+	return tgapi.RichTextAnchorLink{Text: t, AnchorName: name}
+}
+
+// Reference defines t as a named reference target.
+//
+// Since: Bot API 10.1
+func Reference(t tgapi.RichText, name string) tgapi.RichTextReference {
+	return tgapi.RichTextReference{Text: t, Name: name}
+}
+
+// ReferenceLink links t to the named reference name.
+//
+// Since: Bot API 10.1
+func ReferenceLink(t tgapi.RichText, name string) tgapi.RichTextReferenceLink {
+	return tgapi.RichTextReferenceLink{Text: t, ReferenceName: name}
+}
+
+// Concat concatenates rich-text nodes.
+//
+// Since: Bot API 10.1
+func Concat(items ...tgapi.RichText) tgapi.RichText { return tgapi.RichTextArray(items) }

tgrich/ast_test.go

@@ -0,0 +1,112 @@
+package tgrich
+
+import (
+	"errors"
+	"testing"
+	"time"
+
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+)
+
+func TestRenderText(t *testing.T) {
+	tests := []struct {
+		name string
+		text tgapi.RichText
+		want string
+	}{
+		{"plain", Text("<text&>"), "&lt;text&amp;&gt;"},
+		{"array", Concat(Bold(Text("bold")), Text(" plain")), "<b>bold</b> plain"},
+		{"spoiler", Spoiler(Text("secret")), "<tg-spoiler>secret</tg-spoiler>"},
+		{"date time", DateTimeWithFormat(Text("tomorrow"), time.Unix(1, 0), `w"DT`), `<tg-time unix="1" format="w&quot;DT">tomorrow</tg-time>`},
+		{"custom emoji", Emoji("🙂", `id"`), `<tg-emoji emoji-id="id&quot;">🙂</tg-emoji>`},
+		{"formula", MathExpression("x < y"), "<tg-math>x &lt; y</tg-math>"},
+		{"automatic entity", Hashtag(Text("#go"), "go"), "#go"},
+		{"reference", Reference(Text("note"), "note-1"), `<tg-reference name="note-1">note</tg-reference>`},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := renderText(tt.text, 0)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if got != tt.want {
+				t.Fatalf("renderText() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestRenderTextRejectsUnknownWrapper(t *testing.T) {
+	_, err := renderText(tgapi.RichTextWrap{Tag: "unknown", Text: Text("text")}, 0)
+	if !errors.Is(err, ErrRichUnknownTag) {
+		t.Fatalf("renderText() error = %v, want %v", err, ErrRichUnknownTag)
+	}
+}
+
+func TestRenderTextNestingLimit(t *testing.T) {
+	for _, tt := range []struct {
+		name  string
+		depth int
+		want  error
+	}{
+		{"maximum", maxRichDepth, nil},
+		{"too deep", maxRichDepth + 1, ErrRichNestingTooDeep},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			text := tgapi.RichText(Text("text"))
+			for range tt.depth {
+				text = Bold(text)
+			}
+			_, err := renderText(text, 0)
+			if !errors.Is(err, tt.want) {
+				t.Fatalf("renderText() error = %v, want %v", err, tt.want)
+			}
+		})
+	}
+}
+
+func TestRenderBlockNestingLimit(t *testing.T) {
+	for _, tt := range []struct {
+		name  string
+		depth int
+		want  error
+	}{
+		{"maximum", maxRichDepth, nil},
+		{"too deep", maxRichDepth + 1, ErrRichNestingTooDeep},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			var block tgapi.InputRichBlock = P(Text("text"))
+			for range tt.depth - 1 {
+				block = Details(Text("summary"), block)
+			}
+			_, err := renderBlockHTML(block, 0)
+			if !errors.Is(err, tt.want) {
+				t.Fatalf("renderBlockHTML() error = %v, want %v", err, tt.want)
+			}
+		})
+	}
+}
+
+func TestRenderCombinedNestingLimit(t *testing.T) {
+	for _, tt := range []struct {
+		name      string
+		textDepth int
+		want      error
+	}{
+		{"maximum", maxRichDepth - 1, nil},
+		{"too deep", maxRichDepth, ErrRichNestingTooDeep},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			text := tgapi.RichText(Text("text"))
+			for range tt.textDepth {
+				text = Bold(text)
+			}
+
+			_, err := renderBlockHTML(P(text), 0)
+			if !errors.Is(err, tt.want) {
+				t.Fatalf("renderBlockHTML() error = %v, want %v", err, tt.want)
+			}
+		})
+	}
+}

tgrich/build_test.go

@@ -0,0 +1,297 @@
+package tgrich
+
+import (
+	"errors"
+	"strings"
+	"testing"
+
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+)
+
+func TestBuildHTMLBlocks(t *testing.T) {
+	credit := Text("author")
+	tests := []struct {
+		name  string
+		block tgapi.InputRichBlock
+		want  string
+	}{
+		{"paragraph", P(Bold(Text("text"))), "<p><b>text</b></p>"},
+		{"heading", H2(Text("heading")), "<h2>heading</h2>"},
+		{"pre", CodeBlock(Text("code"), "go"), `<pre><code class="language-go">code</code></pre>`},
+		{"footer", Footer(Text("footer")), "<footer>footer</footer>"},
+		{"divider", Hr(), "<hr/>"},
+		{"math", Math("x < y"), "<tg-math-block>x &lt; y</tg-math-block>"},
+		{"anchor", Anchor(`a"b`), `<a name="a&quot;b"></a>`},
+		{"unordered list", Ul(NewListItem(P(Text("item"))).SetCheckbox().SetChecked().Build()), "<ul>\n<li><input type=\"checkbox\" checked/><p>item</p></li></ul>"},
+		{"blockquote", BlockQuoteWithCredit(credit, P(Text("quote"))), "<blockquote><p>quote</p><cite>author</cite></blockquote>"},
+		{"pullquote", PullQuoteWithCredit(Text("quote"), credit), "<aside>quote<cite>author</cite></aside>"},
+		{"table", NewTable(Row(CellWithText(Text("value")).Build())).SetCaption(&credit).Build(), "<table><caption>author</caption><tr><td>value</td></tr></table>"},
+		{"details", DetailsOpen(Text("summary"), P(Text("body"))), "<details open><summary>summary</summary><p>body</p></details>"},
+		{"map", Map(tgapi.Location{Latitude: 41.9, Longitude: 12.5}, 14, 640, 320), `<tg-map height="320" lat="41.9" long="12.5" width="640" zoom="14"/>`},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			message, err := BuildHTML(tt.block)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if message.HTML != tt.want {
+				t.Fatalf("BuildHTML() HTML = %q, want %q", message.HTML, tt.want)
+			}
+			if message.SkipEntityDetection {
+				t.Fatal("BuildHTML() must preserve Telegram's automatic entity detection")
+			}
+		})
+	}
+}
+
+func TestThinkingBlockIsDraftOnly(t *testing.T) {
+	block := Thinking(Text("Thinking…"))
+	if _, err := BuildHTML(block); !errors.Is(err, ErrRichThinkingDraftOnly) {
+		t.Fatalf("BuildHTML() error = %v, want %v", err, ErrRichThinkingDraftOnly)
+	}
+	message, err := BuildDraftHTML(block)
+	if err != nil {
+		t.Fatalf("BuildDraftHTML() returned error: %v", err)
+	}
+	if message.HTML != "<tg-thinking>Thinking…</tg-thinking>" {
+		t.Fatalf("BuildDraftHTML() HTML = %q", message.HTML)
+	}
+}
+
+func TestBuildHTMLValidatesAutomaticallyDetectedEntities(t *testing.T) {
+	tests := []struct {
+		name    string
+		valid   tgapi.RichText
+		invalid tgapi.RichText
+	}{
+		{name: "bank card", valid: BankCardNumber(Text("1234"), "1234"), invalid: BankCardNumber(Text("5678"), "1234")},
+		{name: "mention", valid: Mention(Text("@alice"), "alice"), invalid: Mention(Text("Alice"), "alice")},
+		{name: "hashtag", valid: Hashtag(Text("#go"), "go"), invalid: Hashtag(Text("Go"), "go")},
+		{name: "cashtag", valid: Cashtag(Text("$TON"), "TON"), invalid: Cashtag(Text("Toncoin"), "TON")},
+		{name: "bot command", valid: BotCommand(Text("/start"), "start"), invalid: BotCommand(Text("Start"), "start")},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if _, err := BuildHTML(P(tt.valid)); err != nil {
+				t.Fatalf("valid entity returned error: %v", err)
+			}
+			if _, err := BuildHTML(P(tt.invalid)); !errors.Is(err, ErrRichEntityMismatch) {
+				t.Fatalf("invalid entity error = %v, want ErrRichEntityMismatch", err)
+			}
+		})
+	}
+}
+
+func TestBuildDraftHTMLRejectsDirectUpload(t *testing.T) {
+	_, err := BuildDraftHTML(Photo(tgapi.InputMedia{
+		Type:  tgapi.InputMediaTypePhoto,
+		Media: "attach://photo",
+	}))
+	if !errors.Is(err, tgapi.ErrRichMessageDraftUploadUnsupported) {
+		t.Fatalf("expected ErrRichMessageDraftUploadUnsupported, got %v", err)
+	}
+}
+
+func TestBuildHTMLMedia(t *testing.T) {
+	spoiler := true
+	caption := CaptionWithCredit(Text("caption"), Text("credit"))
+	tests := []struct {
+		name      string
+		block     tgapi.InputRichBlock
+		wantHTML  string
+		wantType  tgapi.InputMediaType
+		wantMedia string
+	}{
+		{"multipart photo", Photo(tgapi.InputMedia{Media: "attach://photo"}), `<img src="tg://photo?id=media_1"/>`, tgapi.InputMediaTypePhoto, "attach://photo"},
+		{"video", Video(tgapi.InputMedia{Media: "video-id"}), `<video src="tg://video?id=media_1"></video>`, tgapi.InputMediaTypeVideo, "video-id"},
+		{"animation", Animation(tgapi.InputMedia{Media: "animation-id"}), `<video src="tg://video?id=media_1"></video>`, tgapi.InputMediaTypeAnimation, "animation-id"},
+		{"audio", Audio(tgapi.InputMedia{Media: "audio-id"}), `<audio src="tg://audio?id=media_1"></audio>`, tgapi.InputMediaTypeAudio, "audio-id"},
+		{"voice note", VoiceNote(tgapi.InputMedia{Media: "voice-id"}), `<audio src="tg://audio?id=media_1"></audio>`, tgapi.InputMediaTypeVoiceNote, "voice-id"},
+		{"caption and spoiler", PhotoWithCaption(tgapi.InputMedia{Media: "photo-id", HasSpoiler: &spoiler}, caption), `<figure><img src="tg://photo?id=media_1" tg-spoiler/><figcaption>caption<cite>credit</cite></figcaption></figure>`, tgapi.InputMediaTypePhoto, "photo-id"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			message, err := BuildHTML(tt.block)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if message.HTML != tt.wantHTML {
+				t.Fatalf("BuildHTML() HTML = %q, want %q", message.HTML, tt.wantHTML)
+			}
+			if len(message.Media) != 1 {
+				t.Fatalf("BuildHTML() media count = %d, want 1", len(message.Media))
+			}
+			media := message.Media[0]
+			if media.ID != "media_1" || media.Media.Type != tt.wantType || media.Media.Media != tt.wantMedia {
+				t.Fatalf("BuildHTML() media = %#v", media)
+			}
+		})
+	}
+}
+
+func TestBuildHTMLNestedMediaUsesSharedIDs(t *testing.T) {
+	message, err := BuildHTML(
+		Collage(Photo(tgapi.InputMedia{Media: "photo"}), Video(tgapi.InputMedia{Media: "video"})),
+		Audio(tgapi.InputMedia{Media: "audio"}),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := `<tg-collage><img src="tg://photo?id=media_1"/><video src="tg://video?id=media_2"></video></tg-collage><audio src="tg://audio?id=media_3"></audio>`
+	if message.HTML != want {
+		t.Fatalf("BuildHTML() HTML = %q, want %q", message.HTML, want)
+	}
+	if len(message.Media) != 3 {
+		t.Fatalf("BuildHTML() media count = %d, want 3", len(message.Media))
+	}
+}
+
+func TestBuildHTMLLimits(t *testing.T) {
+	media := func() tgapi.InputRichBlock {
+		return Photo(tgapi.InputMedia{Media: "photo"})
+	}
+	tests := []struct {
+		name   string
+		blocks func() []tgapi.InputRichBlock
+		want   error
+	}{
+		{"maximum UTF-8 characters", func() []tgapi.InputRichBlock {
+			return []tgapi.InputRichBlock{P(Text(strings.Repeat("я", maxRichTextChars)))}
+		}, nil},
+		{"too many UTF-8 characters", func() []tgapi.InputRichBlock {
+			return []tgapi.InputRichBlock{P(Text(strings.Repeat("я", maxRichTextChars+1)))}
+		}, ErrRichTextTooLong},
+		{"maximum blocks", func() []tgapi.InputRichBlock {
+			blocks := make([]tgapi.InputRichBlock, maxRichBlocks)
+			for i := range blocks {
+				blocks[i] = Hr()
+			}
+			return blocks
+		}, nil},
+		{"too many blocks", func() []tgapi.InputRichBlock {
+			blocks := make([]tgapi.InputRichBlock, maxRichBlocks+1)
+			for i := range blocks {
+				blocks[i] = Hr()
+			}
+			return blocks
+		}, ErrRichTooManyBlocks},
+		{"list items count as blocks", func() []tgapi.InputRichBlock {
+			items := make([]tgapi.InputRichBlockListItem, maxRichBlocks)
+			return []tgapi.InputRichBlock{List(items...)}
+		}, ErrRichTooManyBlocks},
+		{"table rows count as blocks", func() []tgapi.InputRichBlock {
+			rows := make([][]tgapi.RichBlockTableCell, maxRichBlocks)
+			return []tgapi.InputRichBlock{NewTable(rows...).Build()}
+		}, ErrRichTooManyBlocks},
+		{"maximum media", func() []tgapi.InputRichBlock {
+			blocks := make([]tgapi.InputRichBlock, maxRichMedia)
+			for i := range blocks {
+				blocks[i] = media()
+			}
+			return blocks
+		}, nil},
+		{"too many media", func() []tgapi.InputRichBlock {
+			blocks := make([]tgapi.InputRichBlock, maxRichMedia+1)
+			for i := range blocks {
+				blocks[i] = media()
+			}
+			return blocks
+		}, ErrRichTooManyMedia},
+		{"maximum table width", func() []tgapi.InputRichBlock {
+			return []tgapi.InputRichBlock{NewTable(Row(makeCells(maxTableColumns)...)).Build()}
+		}, nil},
+		{"table too wide", func() []tgapi.InputRichBlock {
+			return []tgapi.InputRichBlock{NewTable(Row(makeCells(maxTableColumns + 1)...)).Build()}
+		}, ErrRichTableTooWide},
+		{"colspan counts toward width", func() []tgapi.InputRichBlock {
+			return []tgapi.InputRichBlock{NewTable(Row(Cell().SetSpan(maxTableColumns+1, 1).Build())).Build()}
+		}, ErrRichTableTooWide},
+		{"maximum combined nesting", func() []tgapi.InputRichBlock {
+			return []tgapi.InputRichBlock{P(wrapBold(Text("text"), maxRichDepth-1))}
+		}, nil},
+		{"combined nesting too deep", func() []tgapi.InputRichBlock {
+			return []tgapi.InputRichBlock{P(wrapBold(Text("text"), maxRichDepth))}
+		}, ErrRichNestingTooDeep},
+		{"maximum block nesting", func() []tgapi.InputRichBlock {
+			return []tgapi.InputRichBlock{wrapDetails(P(Text("text")), maxRichDepth-1)}
+		}, nil},
+		{"block nesting too deep", func() []tgapi.InputRichBlock {
+			return []tgapi.InputRichBlock{wrapDetails(P(Text("text")), maxRichDepth)}
+		}, ErrRichNestingTooDeep},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := BuildHTML(tt.blocks()...)
+			if !errors.Is(err, tt.want) {
+				t.Fatalf("BuildHTML() error = %v, want %v", err, tt.want)
+			}
+		})
+	}
+}
+
+func TestBuildHTMLRejectsInvalidFields(t *testing.T) {
+	tests := []struct {
+		name  string
+		block tgapi.InputRichBlock
+		want  error
+	}{
+		{"mixed list", List(NewListItem().SetType(tgapi.InputRichBlockListItemTypeDecimal).Build(), NewListItem().Build()), ErrRichListItemMix},
+		{"unordered value", List(NewListItem().SetValue(2).Build()), ErrRichInvalidListItem},
+		{"invalid list type", List(NewListItem().SetType("x").Build()), ErrRichInvalidListItemType},
+		{"checked without checkbox", List(NewListItem().SetChecked().Build()), ErrRichInvalidCheckbox},
+		{"invalid block type", tgapi.InputRichBlockParagraph{Type: tgapi.InputRichTypeFooter, Text: Text("text")}, ErrRichInvalidBlockType},
+		{"heading too small", H(Text("heading"), 0), ErrRichInvalidHeading},
+		{"heading too large", H(Text("heading"), 7), ErrRichInvalidHeading},
+		{"media mismatch", tgapi.InputRichBlockPhoto{Type: tgapi.InputRichTypePhoto, Photo: tgapi.InputMedia{Type: tgapi.InputMediaTypeVideo, Media: "video"}}, ErrRichInvalidMedia},
+		{"empty media", Photo(tgapi.InputMedia{}), ErrRichInvalidMedia},
+		{"map latitude", Map(tgapi.Location{Latitude: 91}, 0, 0, 0), ErrRichInvalidMap},
+		{"map longitude", Map(tgapi.Location{Longitude: 181}, 0, 0, 0), ErrRichInvalidMap},
+		{"map zoom", Map(tgapi.Location{}, 25, 0, 0), ErrRichInvalidMap},
+		{"map total dimensions", Map(tgapi.Location{}, 0, 9000, 1001), ErrRichInvalidMap},
+		{"map aspect ratio", Map(tgapi.Location{}, 0, 100, 4), ErrRichInvalidMap},
+		{"negative colspan", NewTable(Row(Cell().SetSpan(-1, 0).Build())).Build(), ErrRichInvalidTableCell},
+		{"invalid horizontal alignment", NewTable(Row(Cell().SetAlign("justify").Build())).Build(), ErrRichInvalidTableCell},
+		{"invalid vertical alignment", NewTable(Row(Cell().SetVAlign("center").Build())).Build(), ErrRichInvalidTableCell},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := BuildHTML(tt.block)
+			if !errors.Is(err, tt.want) {
+				t.Fatalf("BuildHTML() error = %v, want %v", err, tt.want)
+			}
+		})
+	}
+}
+
+func TestToHTML(t *testing.T) {
+	message, err := ToHTML(P(Text("text")))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if message.HTML != "<p>text</p>" {
+		t.Fatalf("ToHTML() HTML = %q", message.HTML)
+	}
+}
+
+func makeCells(n int) []tgapi.RichBlockTableCell {
+	return make([]tgapi.RichBlockTableCell, n)
+}
+
+func wrapBold(text tgapi.RichText, depth int) tgapi.RichText {
+	for range depth {
+		text = Bold(text)
+	}
+	return text
+}
+
+func wrapDetails(block tgapi.InputRichBlock, depth int) tgapi.InputRichBlock {
+	for range depth {
+		block = Details(Text("summary"), block)
+	}
+	return block
+}

tgrich/errors.go

@@ -0,0 +1,40 @@
+package tgrich
+
+import "errors"
+
+var (
+	// ErrRichTextTooLong indicates that rich-message text exceeds 32768 UTF-8 characters.
+	ErrRichTextTooLong = errors.New("rich text too long")
+	// ErrRichTooManyBlocks indicates that a rich message exceeds 500 blocks and counted nested items.
+	ErrRichTooManyBlocks = errors.New("rich text too many blocks")
+	// ErrRichNestingTooDeep indicates that rich formatting exceeds 16 nested levels.
+	ErrRichNestingTooDeep = errors.New("rich text nesting deep")
+	// ErrRichTooManyMedia indicates that a rich message contains more than 50 media attachments.
+	ErrRichTooManyMedia = errors.New("rich text too many media")
+	// ErrRichTableTooWide indicates that a table contains more than 20 columns.
+	ErrRichTableTooWide = errors.New("rich text table too wide")
+	// ErrRichUnknownTag indicates that a rich-text or rich-block implementation is unsupported.
+	ErrRichUnknownTag = errors.New("rich unknown tag")
+	// ErrRichListItemMix indicates that ordered and unordered items were mixed in one list.
+	ErrRichListItemMix = errors.New("rich list items mixed: ordered and unordered")
+	// ErrRichInvalidListItem indicates that an unordered item uses ordered-list attributes.
+	ErrRichInvalidListItem = errors.New("rich unordered list item has ordered attributes")
+	// ErrRichInvalidMedia indicates that a media block contains an incompatible media type.
+	ErrRichInvalidMedia = errors.New("rich block has incompatible media type")
+	// ErrRichInvalidBlockType indicates that a block's type discriminator doesn't match its Go type.
+	ErrRichInvalidBlockType = errors.New("rich block has invalid type")
+	// ErrRichInvalidHeading indicates that a heading has a size outside 1-6.
+	ErrRichInvalidHeading = errors.New("rich heading has invalid size")
+	// ErrRichInvalidMap indicates that a map has invalid coordinates, zoom, or dimensions.
+	ErrRichInvalidMap = errors.New("rich map has invalid parameters")
+	// ErrRichInvalidListItemType indicates that an ordered-list marker type is unsupported.
+	ErrRichInvalidListItemType = errors.New("rich list item has invalid type")
+	// ErrRichInvalidCheckbox indicates that a checked list item has no checkbox.
+	ErrRichInvalidCheckbox = errors.New("rich list item is checked without a checkbox")
+	// ErrRichInvalidTableCell indicates that a table cell has invalid spans or alignment.
+	ErrRichInvalidTableCell = errors.New("rich table cell has invalid parameters")
+	// ErrRichThinkingDraftOnly indicates that a thinking block was used outside a draft.
+	ErrRichThinkingDraftOnly = errors.New("thinking blocks are valid only in rich-message drafts")
+	// ErrRichEntityMismatch indicates that HTML conversion would lose an explicit entity value.
+	ErrRichEntityMismatch = errors.New("rich entity value doesn't match visible text")
+)

tgrich/html_render.go

@@ -0,0 +1,548 @@
+package tgrich
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+)
+
+type buildState struct {
+	media []tgapi.InputRichMessageMedia
+}
+
+// BuildHTML converts input rich blocks to an HTML-based rich message and
+// collects media blocks into InputRichMessage.Media.
+//
+// Since: Bot API 10.2
+func BuildHTML(blocks ...tgapi.InputRichBlock) (tgapi.InputRichMessage, error) {
+	return buildHTML(false, blocks...)
+}
+
+// BuildDraftHTML converts draft-compatible input rich blocks to HTML.
+// Unlike BuildHTML, it permits the draft-only thinking block.
+//
+// Since: Bot API 10.2
+func BuildDraftHTML(blocks ...tgapi.InputRichBlock) (tgapi.InputRichMessage, error) {
+	return buildHTML(true, blocks...)
+}
+
+func buildHTML(allowThinking bool, blocks ...tgapi.InputRichBlock) (tgapi.InputRichMessage, error) {
+	if err := validateRichBlocks(blocks, allowThinking); err != nil {
+		return tgapi.InputRichMessage{}, err
+	}
+	state := new(buildState)
+	rendered, err := renderBlocksHTMLState(blocks, 0, state)
+	if err != nil {
+		return tgapi.InputRichMessage{}, err
+	}
+	if allowThinking {
+		for _, item := range state.media {
+			if strings.HasPrefix(item.Media.Media, "attach://") {
+				return tgapi.InputRichMessage{}, tgapi.ErrRichMessageDraftUploadUnsupported
+			}
+		}
+	}
+	return tgapi.InputRichMessage{
+		HTML:  strings.Join(rendered, ""),
+		Media: state.media,
+	}, nil
+}
+
+// ToHTML converts one input rich block to an HTML-based rich message.
+//
+// Since: Bot API 10.2
+func ToHTML(block tgapi.InputRichBlock) (tgapi.InputRichMessage, error) { return BuildHTML(block) }
+
+func (s *buildState) addMedia(media tgapi.InputMedia) (string, error) {
+	if len(s.media) >= maxRichMedia {
+		return "", ErrRichTooManyMedia
+	}
+	var kind string
+	switch media.Type {
+	case tgapi.InputMediaTypePhoto:
+		kind = "photo"
+	case tgapi.InputMediaTypeAnimation, tgapi.InputMediaTypeVideo:
+		kind = "video"
+	case tgapi.InputMediaTypeAudio, tgapi.InputMediaTypeVoiceNote:
+		kind = "audio"
+	default:
+		return "", ErrRichInvalidMedia
+	}
+	id := "media_" + strconv.Itoa(len(s.media)+1)
+	s.media = append(s.media, tgapi.InputRichMessageMedia{ID: id, Media: media})
+	return "tg://" + kind + "?id=" + id, nil
+}
+
+func renderText(t tgapi.RichText, step int) (string, error) {
+	switch el := t.(type) {
+	case tgapi.RichTextPlain:
+		return escapeHTML(string(el)), nil
+	case tgapi.RichTextArray:
+		var b strings.Builder
+		for _, item := range el {
+			part, err := renderText(item, step)
+			if err != nil {
+				return "", err
+			}
+			b.WriteString(part)
+		}
+		return b.String(), nil
+	case tgapi.RichTextWrap:
+		s, err := renderTextChild(el.Text, step)
+		if err != nil {
+			return "", err
+		}
+		tagMap := map[string]string{
+			"bold": "b", "italic": "i", "underline": "u", "strikethrough": "s",
+			"subscript": "sub", "superscript": "sup", "marked": "mark",
+			"spoiler": "tg-spoiler", "code": "code",
+		}
+		tag, ok := tagMap[el.Tag]
+		if !ok {
+			return "", ErrRichUnknownTag
+		}
+		return "<" + tag + ">" + s + "</" + tag + ">", nil
+	case tgapi.RichTextDateTime:
+		s, err := renderTextChild(el.Text, step)
+		if err != nil {
+			return "", err
+		}
+
+		attrs := []string{`unix="` + strconv.FormatInt(el.UnixTime, 10) + `"`}
+		if el.DateTimeFormat != "" {
+			attrs = append(attrs, `format="`+escapeHTML(el.DateTimeFormat)+`"`)
+		}
+		return openTag("tg-time", attrs) + s + "</tg-time>", nil
+	case tgapi.RichTextTextMention:
+		s, err := renderTextChild(el.Text, step)
+		if err != nil {
+			return "", err
+		}
+		attrs := []string{`href="` + "tg://user?id=" + strconv.FormatInt(el.User.ID, 10) + `"`}
+		return openTag("a", attrs) + s + "</a>", nil
+	case tgapi.RichTextCustomEmoji:
+		s := escapeHTML(el.AlternativeText)
+		attrs := formatAttrs(map[string]string{"emoji-id": el.CustomEmojiID})
+		return openTag("tg-emoji", attrs) + s + "</tg-emoji>", nil
+	case tgapi.RichTextMathematicalExpression:
+		s := escapeHTML(el.Expression)
+		return "<tg-math>" + s + "</tg-math>", nil
+	case tgapi.RichTextURL:
+		s, err := renderTextChild(el.Text, step)
+		if err != nil {
+			return "", err
+		}
+		attrs := formatAttrs(map[string]string{"href": el.URL})
+		return openTag("a", attrs) + s + "</a>", nil
+	case tgapi.RichTextEmailAddress:
+		s, err := renderTextChild(el.Text, step)
+		if err != nil {
+			return "", err
+		}
+		attrs := formatAttrs(map[string]string{"href": "mailto:" + el.EmailAddress})
+		return openTag("a", attrs) + s + "</a>", nil
+	case tgapi.RichTextPhoneNumber:
+		s, err := renderTextChild(el.Text, step)
+		if err != nil {
+			return "", err
+		}
+		attrs := formatAttrs(map[string]string{"href": "tel:" + el.PhoneNumber})
+		return openTag("a", attrs) + s + "</a>", nil
+	case tgapi.RichTextBankCardNumber:
+		return renderTextChild(el.Text, step)
+	case tgapi.RichTextMention:
+		return renderTextChild(el.Text, step)
+	case tgapi.RichTextHashtag:
+		return renderTextChild(el.Text, step)
+	case tgapi.RichTextCashtag:
+		return renderTextChild(el.Text, step)
+	case tgapi.RichTextBotCommand:
+		return renderTextChild(el.Text, step)
+	case tgapi.RichTextAnchor:
+		attrs := formatAttrs(map[string]string{"name": el.Name})
+		return openTag("a", attrs) + "</a>", nil
+	case tgapi.RichTextAnchorLink:
+		s, err := renderTextChild(el.Text, step)
+		if err != nil {
+			return "", err
+		}
+		attrs := formatAttrs(map[string]string{"href": "#" + el.AnchorName})
+		return openTag("a", attrs) + s + "</a>", nil
+	case tgapi.RichTextReference:
+		s, err := renderTextChild(el.Text, step)
+		if err != nil {
+			return "", err
+		}
+		attrs := formatAttrs(map[string]string{"name": el.Name})
+		return openTag("tg-reference", attrs) + s + "</tg-reference>", nil
+	case tgapi.RichTextReferenceLink:
+		s, err := renderTextChild(el.Text, step)
+		if err != nil {
+			return "", err
+		}
+		attrs := formatAttrs(map[string]string{"href": "#" + el.ReferenceName})
+		return openTag("a", attrs) + s + "</a>", nil
+	}
+	return "", ErrRichUnknownTag
+}
+
+func renderTextChild(t tgapi.RichText, step int) (string, error) {
+	if step >= maxRichDepth {
+		return "", ErrRichNestingTooDeep
+	}
+	return renderText(t, step+1)
+}
+
+func renderHTMLTable(t tgapi.InputRichBlockTable, step int, state *buildState) (string, error) {
+	attrs := map[string]string{}
+	if t.IsBordered {
+		attrs["bordered"] = ""
+	}
+	if t.IsStriped {
+		attrs["striped"] = ""
+	}
+
+	var rows strings.Builder
+	for _, row := range t.Cells {
+		r, err := renderHTMLTableRow(row, step, state)
+		if err != nil {
+			return "", err
+		}
+		rows.WriteString(r)
+	}
+	caption := ""
+	if t.Caption != nil {
+		text, err := renderText(*t.Caption, step+1)
+		if err != nil {
+			return "", err
+		}
+		caption = "<caption>" + text + "</caption>"
+	}
+	return openTag("table", formatAttrs(attrs)) + caption + rows.String() + "</table>", nil
+}
+func renderHTMLTableRow(rows []tgapi.RichBlockTableCell, step int, state *buildState) (string, error) {
+	var out strings.Builder
+	for _, cell := range rows {
+		row, err := renderHTMLTableCell(cell, step, state)
+		if err != nil {
+			return "", err
+		}
+		out.WriteString(row)
+	}
+	return "<tr>" + out.String() + "</tr>", nil
+}
+func renderHTMLTableCell(c tgapi.RichBlockTableCell, step int, _ *buildState) (string, error) {
+	var renderedText string
+	var err error
+	if c.Text != nil {
+		renderedText, err = renderText(c.Text, step+1)
+	}
+	if err != nil {
+		return "", err
+	}
+
+	mapAttrs := make(map[string]string)
+	tag := "td"
+	if c.IsHeader {
+		tag = "th"
+	}
+	if c.RowSpan > 0 {
+		mapAttrs["rowspan"] = strconv.Itoa(c.RowSpan)
+	}
+	if c.ColSpan > 0 {
+		mapAttrs["colspan"] = strconv.Itoa(c.ColSpan)
+	}
+	if c.Align != "" {
+		mapAttrs["align"] = c.Align
+	}
+	if c.VAlign != "" {
+		mapAttrs["valign"] = c.VAlign
+	}
+	return openTag(tag, formatAttrs(mapAttrs)) + renderedText + "</" + tag + ">", nil
+}
+func renderHTMLList(l tgapi.InputRichBlockList, step int, state *buildState) (string, error) {
+	if len(l.Items) == 0 {
+		return "<ul></ul>", nil
+	}
+
+	hasType := false
+	hasNoType := false
+
+	var items []string
+	for _, item := range l.Items {
+		if item.Type != "" {
+			hasType = true
+		} else {
+			hasNoType = true
+			if item.Value != 0 {
+				return "", ErrRichInvalidListItem
+			}
+		}
+		rendered, err := renderHTMLListItem(item, step, state)
+		if err != nil {
+			return "", err
+		}
+		items = append(items, rendered)
+	}
+
+	switch {
+	case hasType && !hasNoType:
+		return "<ol>\n" + strings.Join(items, "\n") + "</ol>", nil
+	case hasNoType && !hasType:
+		return "<ul>\n" + strings.Join(items, "\n") + "</ul>", nil
+	}
+	return "", ErrRichListItemMix
+}
+
+func renderHTMLCaption(cap tgapi.RichBlockCaption, step int) (string, error) {
+	caption := "<figcaption>"
+	text, err := renderText(cap.Text, step)
+	if err != nil {
+		return "", err
+	}
+	caption += text
+	if cap.Credit != nil {
+		cred, err := renderText(cap.Credit, step)
+		if err != nil {
+			return "", err
+		}
+		caption += "<cite>" + cred + "</cite>"
+	}
+	caption += "</figcaption>"
+	return caption, nil
+}
+func renderHTMLListItem(i tgapi.InputRichBlockListItem, step int, state *buildState) (string, error) {
+	mapAttrs := map[string]string{}
+
+	renderedBlocks, err := renderBlocksHTMLState(i.Blocks, step+1, state)
+	if err != nil {
+		return "", err
+	}
+
+	blocks := strings.Join(renderedBlocks, "")
+	if i.HasCheckbox {
+		var input string
+		if i.IsChecked {
+			input = `<input type="checkbox" checked/>`
+		} else {
+			input = `<input type="checkbox"/>`
+		}
+		blocks = input + blocks
+	}
+	if i.Value > 0 {
+		mapAttrs["value"] = strconv.Itoa(i.Value)
+	}
+	if i.Type != "" {
+		mapAttrs["type"] = string(i.Type)
+	}
+	return openTag("li", formatAttrs(mapAttrs)) + blocks + "</li>", nil
+}
+
+func renderHTMLMap(block tgapi.InputRichBlockMap, step int) (string, error) {
+	attrs := map[string]string{
+		"lat":  strconv.FormatFloat(block.Location.Latitude, 'f', -1, 64),
+		"long": strconv.FormatFloat(block.Location.Longitude, 'f', -1, 64),
+	}
+	if block.Zoom != 0 {
+		attrs["zoom"] = strconv.Itoa(int(block.Zoom))
+	}
+	if block.Width != 0 {
+		attrs["width"] = strconv.Itoa(int(block.Width))
+	}
+	if block.Height != 0 {
+		attrs["height"] = strconv.Itoa(int(block.Height))
+	}
+	media := selfClosingTag("tg-map", formatAttrs(attrs))
+	if block.Caption == nil {
+		return media, nil
+	}
+	caption, err := renderHTMLCaption(*block.Caption, step+1)
+	if err != nil {
+		return "", err
+	}
+	return "<figure>" + media + caption + "</figure>", nil
+}
+
+func renderHTMLMedia(media tgapi.InputMedia, caption *tgapi.RichBlockCaption, tag string, step int, state *buildState) (string, error) {
+	src, err := state.addMedia(media)
+	if err != nil {
+		return "", err
+	}
+	attrs := map[string]string{"src": src}
+	if media.HasSpoiler != nil && *media.HasSpoiler {
+		attrs["tg-spoiler"] = ""
+	}
+
+	var element string
+	if tag == "img" {
+		element = selfClosingTag(tag, formatAttrs(attrs))
+	} else {
+		element = openTag(tag, formatAttrs(attrs)) + "</" + tag + ">"
+	}
+	if caption == nil {
+		return element, nil
+	}
+	renderedCaption, err := renderHTMLCaption(*caption, step+1)
+	if err != nil {
+		return "", err
+	}
+	return "<figure>" + element + renderedCaption + "</figure>", nil
+}
+
+// func renderBlocksHTML(blocks []tgapi.InputRichBlock, step int) ([]string, error) {
+// 	return renderBlocksHTMLState(blocks, step, new(buildState))
+// }
+
+func renderBlocksHTMLState(blocks []tgapi.InputRichBlock, step int, state *buildState) ([]string, error) {
+	var out []string
+	for _, b := range blocks {
+		html, err := renderBlockHTMLState(b, step, state)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, html)
+	}
+	return out, nil
+}
+
+func renderBlockHTML(block tgapi.InputRichBlock, step int) (string, error) {
+	return renderBlockHTMLState(block, step, new(buildState))
+}
+
+func renderBlockHTMLState(block tgapi.InputRichBlock, step int, state *buildState) (string, error) {
+	if step >= maxRichDepth {
+		return "", ErrRichNestingTooDeep
+	}
+	switch el := block.(type) {
+	case tgapi.InputRichBlockParagraph:
+		t, err := renderText(el.Text, step+1)
+		if err != nil {
+			return "", err
+		}
+		return "<p>" + t + "</p>", nil
+	case tgapi.InputRichBlockSectionHeading:
+		t, err := renderText(el.Text, step+1)
+		if err != nil {
+			return "", err
+		}
+		size := strconv.Itoa(int(el.Size))
+		return "<h" + size + ">" + t + "</h" + size + ">", nil
+	case tgapi.InputRichBlockPreformatted:
+		t, err := renderText(el.Text, step+1)
+		if err != nil {
+			return "", err
+		}
+		if el.Language != "" {
+			t = fmt.Sprintf(`<code class="language-%s">%s</code>`, escapeHTML(el.Language), t)
+		}
+		return "<pre>" + t + "</pre>", nil
+	case tgapi.InputRichBlockFooter:
+		t, err := renderText(el.Text, step+1)
+		if err != nil {
+			return "", err
+		}
+		return "<footer>" + t + "</footer>", nil
+	case tgapi.InputRichBlockDivider:
+		return "<hr/>", nil
+	case tgapi.InputRichBlockMath:
+		exp := escapeHTML(el.Expression)
+		return "<tg-math-block>" + exp + "</tg-math-block>", nil
+	case tgapi.InputRichBlockAnchor:
+		return fmt.Sprintf(`<a name="%s"></a>`, escapeHTML(el.Name)), nil
+	case tgapi.InputRichBlockList:
+		return renderHTMLList(el, step, state)
+	case tgapi.InputRichBlockBlockQuotation:
+		content, err := renderBlocksHTMLState(el.Blocks, step+1, state)
+		if err != nil {
+			return "", err
+		}
+		credit := ""
+		if el.Credit != nil {
+			credit, err = renderText(*el.Credit, step+1)
+			if err != nil {
+				return "", err
+			}
+			credit = "<cite>" + credit + "</cite>"
+		}
+		return "<blockquote>" + strings.Join(content, "") + credit + "</blockquote>", nil
+	case tgapi.InputRichBlockPullQuotation:
+		text, err := renderText(el.Text, step+1)
+		if err != nil {
+			return "", err
+		}
+		credit := ""
+		if el.Credit != nil {
+			credit, err = renderText(*el.Credit, step+1)
+			if err != nil {
+				return "", err
+			}
+			credit = "<cite>" + credit + "</cite>"
+		}
+		return "<aside>" + text + credit + "</aside>", nil
+	case tgapi.InputRichBlockCollage:
+		blocks, err := renderBlocksHTMLState(el.Blocks, step+1, state)
+		if err != nil {
+			return "", err
+		}
+		caption := ""
+		if el.Caption != nil {
+			caption, err = renderHTMLCaption(*el.Caption, step+1)
+			if err != nil {
+				return "", err
+			}
+		}
+		return "<tg-collage>" + strings.Join(blocks, "") + caption + "</tg-collage>", err
+	case tgapi.InputRichBlockSlideshow:
+		blocks, err := renderBlocksHTMLState(el.Blocks, step+1, state)
+		if err != nil {
+			return "", err
+		}
+		caption := ""
+		if el.Caption != nil {
+			caption, err = renderHTMLCaption(*el.Caption, step+1)
+			if err != nil {
+				return "", err
+			}
+		}
+		return "<tg-slideshow>" + strings.Join(blocks, "") + caption + "</tg-slideshow>", err
+	case tgapi.InputRichBlockTable:
+		return renderHTMLTable(el, step, state)
+	case tgapi.InputRichBlockDetails:
+		summary, err := renderText(el.Summary, step+1)
+		if err != nil {
+			return "", err
+		}
+		blocks, err := renderBlocksHTMLState(el.Blocks, step+1, state)
+		if err != nil {
+			return "", err
+		}
+
+		attrs := make(map[string]string)
+		if el.IsOpen {
+			attrs["open"] = ""
+		}
+
+		return openTag("details", formatAttrs(attrs)) + "<summary>" + summary + "</summary>" + strings.Join(blocks, "") + "</details>", nil
+	case tgapi.InputRichBlockMap:
+		return renderHTMLMap(el, step)
+	case tgapi.InputRichBlockAnimation:
+		return renderHTMLMedia(el.Animation, el.Caption, "video", step, state)
+	case tgapi.InputRichBlockAudio:
+		return renderHTMLMedia(el.Audio, el.Caption, "audio", step, state)
+	case tgapi.InputRichBlockPhoto:
+		return renderHTMLMedia(el.Photo, el.Caption, "img", step, state)
+	case tgapi.InputRichBlockVideo:
+		return renderHTMLMedia(el.Video, el.Caption, "video", step, state)
+	case tgapi.InputRichBlockVoiceNote:
+		return renderHTMLMedia(el.VoiceNote, el.Caption, "audio", step, state)
+	case tgapi.InputRichBlockThinking:
+		text, err := renderText(el.Text, step+1)
+		if err != nil {
+			return "", err
+		}
+		return "<tg-thinking>" + text + "</tg-thinking>", nil
+	}
+	return "", ErrRichUnknownTag
+}

tgrich/input_fmt.go

@@ -0,0 +1,570 @@
+package tgrich
+
+import "git.scuroneko.dev/scuroneko/laniakea/tgapi"
+
+// Caption creates a media-block caption without a credit.
+//
+// Since: Bot API 10.2
+func Caption(text tgapi.RichText) tgapi.RichBlockCaption { return tgapi.RichBlockCaption{Text: text} }
+
+// CaptionWithCredit creates a media-block caption with a credit.
+//
+// Since: Bot API 10.2
+func CaptionWithCredit(text, credit tgapi.RichText) tgapi.RichBlockCaption {
+	return tgapi.RichBlockCaption{Text: text, Credit: credit}
+}
+
+// P creates a text paragraph corresponding to the HTML <p> tag.
+//
+// Since: Bot API 10.2
+func P(text tgapi.RichText) tgapi.InputRichBlockParagraph {
+	return tgapi.InputRichBlockParagraph{Type: tgapi.InputRichTypeParagraph, Text: text}
+}
+
+// H creates a section heading with a relative font size from 1 (largest) to 6 (smallest).
+//
+// Since: Bot API 10.2
+func H(text tgapi.RichText, size uint8) tgapi.InputRichBlockSectionHeading {
+	return tgapi.InputRichBlockSectionHeading{
+		Type: tgapi.InputRichTypeSectionHeading,
+		Text: text, Size: size,
+	}
+}
+
+// H1 creates a level-one section heading.
+//
+// Since: Bot API 10.2
+func H1(text tgapi.RichText) tgapi.InputRichBlockSectionHeading { return H(text, 1) }
+
+// H2 creates a level-two section heading.
+//
+// Since: Bot API 10.2
+func H2(text tgapi.RichText) tgapi.InputRichBlockSectionHeading { return H(text, 2) }
+
+// H3 creates a level-three section heading.
+//
+// Since: Bot API 10.2
+func H3(text tgapi.RichText) tgapi.InputRichBlockSectionHeading { return H(text, 3) }
+
+// H4 creates a level-four section heading.
+//
+// Since: Bot API 10.2
+func H4(text tgapi.RichText) tgapi.InputRichBlockSectionHeading { return H(text, 4) }
+
+// H5 creates a level-five section heading.
+//
+// Since: Bot API 10.2
+func H5(text tgapi.RichText) tgapi.InputRichBlockSectionHeading { return H(text, 5) }
+
+// H6 creates a level-six section heading.
+//
+// Since: Bot API 10.2
+func H6(text tgapi.RichText) tgapi.InputRichBlockSectionHeading { return H(text, 6) }
+
+// Pre creates a preformatted text block without a programming language.
+//
+// Since: Bot API 10.2
+func Pre(text tgapi.RichText) tgapi.InputRichBlockPreformatted {
+	return tgapi.InputRichBlockPreformatted{Type: tgapi.InputRichTypePre, Text: text}
+}
+
+// CodeBlock creates a preformatted text block with its programming language.
+//
+// Since: Bot API 10.2
+func CodeBlock(text tgapi.RichText, lang string) tgapi.InputRichBlockPreformatted {
+	return tgapi.InputRichBlockPreformatted{Type: tgapi.InputRichTypePre, Text: text, Language: lang}
+}
+
+// Footer creates a footer block.
+//
+// Since: Bot API 10.2
+func Footer(text tgapi.RichText) tgapi.InputRichBlockFooter {
+	return tgapi.InputRichBlockFooter{Type: tgapi.InputRichTypeFooter, Text: text}
+}
+
+// Hr creates a divider corresponding to the HTML <hr/> tag.
+//
+// Since: Bot API 10.2
+func Hr() tgapi.InputRichBlockDivider {
+	return tgapi.InputRichBlockDivider{Type: tgapi.InputRichTypeDivider}
+}
+
+// Math creates a mathematical expression block from a LaTeX expression.
+//
+// Since: Bot API 10.2
+func Math(expression string) tgapi.InputRichBlockMath {
+	return tgapi.InputRichBlockMath{Type: tgapi.InputRichTypeMathematicalExpression, Expression: expression}
+}
+
+// Anchor creates a block containing an anchor with the given name.
+//
+// Since: Bot API 10.2
+func Anchor(name string) tgapi.InputRichBlockAnchor {
+	return tgapi.InputRichBlockAnchor{Type: tgapi.InputRichTypeAnchor, Name: name}
+}
+
+// ListItem builds an input rich-message list item.
+//
+// Since: Bot API 10.2
+type ListItem struct {
+	blocks      []tgapi.InputRichBlock
+	hasCheckbox bool
+	isChecked   bool
+	value       int
+	t           tgapi.RichBlockListItemType
+}
+
+// NewListItem creates a list-item builder containing blocks.
+//
+// Since: Bot API 10.2
+func NewListItem(blocks ...tgapi.InputRichBlock) *ListItem {
+	return &ListItem{blocks: blocks}
+}
+
+// SetBlocks replaces the blocks in the list item.
+//
+// Since: Bot API 10.2
+func (i *ListItem) SetBlocks(blocks ...tgapi.InputRichBlock) *ListItem {
+	i.blocks = blocks
+	return i
+}
+
+// SetCheckbox adds an unchecked checkbox to the list item.
+//
+// Since: Bot API 10.2
+func (i *ListItem) SetCheckbox() *ListItem {
+	i.hasCheckbox = true
+	return i
+}
+
+// SetChecked marks the list item's checkbox as checked.
+//
+// Since: Bot API 10.2
+func (i *ListItem) SetChecked() *ListItem {
+	i.isChecked = true
+	return i
+}
+
+// SetValue sets the explicit number of an ordered-list item.
+//
+// Since: Bot API 10.2
+func (i *ListItem) SetValue(val int) *ListItem {
+	i.value = val
+	return i
+}
+
+// SetType sets the marker style of an ordered-list item.
+//
+// Since: Bot API 10.2
+func (i *ListItem) SetType(t tgapi.RichBlockListItemType) *ListItem {
+	i.t = t
+	return i
+}
+
+// Build returns the configured input rich-message list item.
+//
+// Since: Bot API 10.2
+func (i *ListItem) Build() tgapi.InputRichBlockListItem {
+	return tgapi.InputRichBlockListItem{
+		Blocks:      i.blocks,
+		HasCheckbox: i.hasCheckbox,
+		IsChecked:   i.isChecked,
+		Value:       i.value,
+		Type:        i.t,
+	}
+}
+
+// List creates a list block from fully configured items.
+//
+// Since: Bot API 10.2
+func List(items ...tgapi.InputRichBlockListItem) tgapi.InputRichBlockList {
+	return tgapi.InputRichBlockList{Type: tgapi.InputRichTypeList, Items: items}
+}
+
+// Ul creates an unordered list and clears ordered-list attributes.
+//
+// Since: Bot API 10.2
+func Ul(items ...tgapi.InputRichBlockListItem) tgapi.InputRichBlockList {
+	newItems := make([]tgapi.InputRichBlockListItem, len(items))
+	for index, item := range items {
+		newItems[index] = tgapi.InputRichBlockListItem{
+			Blocks:      item.Blocks,
+			HasCheckbox: item.HasCheckbox,
+			IsChecked:   item.IsChecked,
+		}
+	}
+	return List(newItems...)
+}
+
+// OlOpts configures ordered-list numbering.
+//
+// Since: Bot API 10.2
+type OlOpts struct {
+	// Type is the marker style: "1", "a", "A", "i", or "I".
+	Type tgapi.RichBlockListItemType
+	// Start is the number of the first item; values below 1 use the default.
+	Start int
+	// IsReversed reports whether numbering decreases from Start.
+	IsReversed bool
+}
+
+// Ol creates an ordered list using opts for numbering.
+//
+// Since: Bot API 10.2
+func Ol(opts OlOpts, items ...tgapi.InputRichBlockListItem) tgapi.InputRichBlockList {
+	newItems := make([]tgapi.InputRichBlockListItem, len(items))
+	start := opts.Start
+	if start < 1 {
+		start = 1
+		if opts.IsReversed {
+			start = len(items)
+		}
+	}
+	typ := opts.Type
+	if typ == "" {
+		typ = tgapi.InputRichBlockListItemTypeDecimal
+	}
+	for index, item := range items {
+		val := index + start
+		if opts.IsReversed {
+			val = start - index
+		}
+		newItems[index] = tgapi.InputRichBlockListItem{
+			Blocks:      item.Blocks,
+			HasCheckbox: item.HasCheckbox,
+			IsChecked:   item.IsChecked,
+			Value:       val,
+			Type:        typ,
+		}
+	}
+	return List(newItems...)
+}
+
+// BlockQuote creates a block quotation without a credit.
+//
+// Since: Bot API 10.2
+func BlockQuote(blocks ...tgapi.InputRichBlock) tgapi.InputRichBlockBlockQuotation {
+	return tgapi.InputRichBlockBlockQuotation{Type: tgapi.InputRichTypeBlockQuotation, Blocks: blocks}
+}
+
+// BlockQuoteWithCredit creates a block quotation with a credit.
+//
+// Since: Bot API 10.2
+func BlockQuoteWithCredit(credit tgapi.RichText, blocks ...tgapi.InputRichBlock) tgapi.InputRichBlockBlockQuotation {
+	return tgapi.InputRichBlockBlockQuotation{Type: tgapi.InputRichTypeBlockQuotation, Blocks: blocks, Credit: &credit}
+}
+
+// PullQuote creates a centered quotation without a credit.
+//
+// Since: Bot API 10.2
+func PullQuote(text tgapi.RichText) tgapi.InputRichBlockPullQuotation {
+	return tgapi.InputRichBlockPullQuotation{Type: tgapi.InputRichTypePullQuotation, Text: text}
+}
+
+// PullQuoteWithCredit creates a centered quotation with a credit.
+//
+// Since: Bot API 10.2
+func PullQuoteWithCredit(text tgapi.RichText, credit tgapi.RichText) tgapi.InputRichBlockPullQuotation {
+	return tgapi.InputRichBlockPullQuotation{Type: tgapi.InputRichTypePullQuotation, Text: text, Credit: &credit}
+}
+
+// Collage creates a media collage without a caption.
+//
+// Since: Bot API 10.2
+func Collage(blocks ...tgapi.InputRichBlock) tgapi.InputRichBlockCollage {
+	return tgapi.InputRichBlockCollage{Type: tgapi.InputRichTypeCollage, Blocks: blocks}
+}
+
+// CollageWithCaption creates a media collage with a caption.
+//
+// Since: Bot API 10.2
+func CollageWithCaption(caption tgapi.RichBlockCaption, blocks ...tgapi.InputRichBlock) tgapi.InputRichBlockCollage {
+	return tgapi.InputRichBlockCollage{Type: tgapi.InputRichTypeCollage, Blocks: blocks, Caption: &caption}
+}
+
+// Slideshow creates a media slideshow without a caption.
+//
+// Since: Bot API 10.2
+func Slideshow(blocks ...tgapi.InputRichBlock) tgapi.InputRichBlockSlideshow {
+	return tgapi.InputRichBlockSlideshow{Type: tgapi.InputRichTypeSlideshow, Blocks: blocks}
+}
+
+// SlideshowWithCaption creates a media slideshow with a caption.
+//
+// Since: Bot API 10.2
+func SlideshowWithCaption(caption tgapi.RichBlockCaption, blocks ...tgapi.InputRichBlock) tgapi.InputRichBlockSlideshow {
+	return tgapi.InputRichBlockSlideshow{Type: tgapi.InputRichTypeSlideshow, Blocks: blocks, Caption: &caption}
+}
+
+// TableCell builds a rich-message table cell.
+//
+// Since: Bot API 10.2
+type TableCell struct {
+	text     tgapi.RichText
+	isHeader bool
+	colSpan  int
+	rowSpan  int
+	align    string
+	vAlign   string
+}
+
+// Cell creates an empty table-cell builder.
+//
+// Since: Bot API 10.2
+func Cell() *TableCell { return &TableCell{} }
+
+// CellWithText creates a table-cell builder containing text.
+//
+// Since: Bot API 10.2
+func CellWithText(text tgapi.RichText) *TableCell { return &TableCell{text: text} }
+
+// SetText replaces the text in the table cell.
+//
+// Since: Bot API 10.2
+func (c *TableCell) SetText(text tgapi.RichText) *TableCell {
+	c.text = text
+	return c
+}
+
+// SetHeader marks the cell as a table header.
+//
+// Since: Bot API 10.2
+func (c *TableCell) SetHeader() *TableCell {
+	c.isHeader = true
+	return c
+}
+
+// SetSpan sets the cell's column and row spans.
+//
+// Since: Bot API 10.2
+func (c *TableCell) SetSpan(col, row int) *TableCell {
+	c.colSpan = col
+	c.rowSpan = row
+	return c
+}
+
+// SetAlign sets horizontal alignment to left, center, or right.
+//
+// Since: Bot API 10.2
+func (c *TableCell) SetAlign(align string) *TableCell {
+	c.align = align
+	return c
+}
+
+// SetVAlign sets vertical alignment to top, middle, or bottom.
+//
+// Since: Bot API 10.2
+func (c *TableCell) SetVAlign(vAlign string) *TableCell {
+	c.vAlign = vAlign
+	return c
+}
+
+// Build returns the configured rich-message table cell.
+//
+// Since: Bot API 10.2
+func (c *TableCell) Build() tgapi.RichBlockTableCell {
+	return tgapi.RichBlockTableCell{
+		Text:     c.text,
+		IsHeader: c.isHeader,
+		ColSpan:  c.colSpan,
+		RowSpan:  c.rowSpan,
+		Align:    c.align,
+		VAlign:   c.vAlign,
+	}
+}
+
+// Row creates a table row containing cells.
+//
+// Since: Bot API 10.2
+func Row(cells ...tgapi.RichBlockTableCell) []tgapi.RichBlockTableCell {
+	return cells
+}
+
+// RichTable builds an input rich-message table block.
+//
+// Since: Bot API 10.2
+type RichTable struct {
+	// Cells contains table rows and their cells.
+	Cells [][]tgapi.RichBlockTableCell
+	// IsBordered reports whether the table has borders.
+	IsBordered bool
+	// IsStriped reports whether the table has striped rows.
+	IsStriped bool
+	// Caption is the optional table caption.
+	Caption *tgapi.RichText
+}
+
+// NewTable creates a table builder containing rows.
+//
+// Since: Bot API 10.2
+func NewTable(rows ...[]tgapi.RichBlockTableCell) *RichTable {
+	return &RichTable{Cells: rows}
+}
+
+// AddRows appends rows to the table.
+//
+// Since: Bot API 10.2
+func (t *RichTable) AddRows(rows ...[]tgapi.RichBlockTableCell) *RichTable {
+	t.Cells = append(t.Cells, rows...)
+	return t
+}
+
+// SetBordered controls whether the table has borders.
+//
+// Since: Bot API 10.2
+func (t *RichTable) SetBordered(b bool) *RichTable {
+	t.IsBordered = b
+	return t
+}
+
+// SetStriped controls whether the table has striped rows.
+//
+// Since: Bot API 10.2
+func (t *RichTable) SetStriped(b bool) *RichTable {
+	t.IsStriped = b
+	return t
+}
+
+// SetCaption sets the table caption.
+//
+// Since: Bot API 10.2
+func (t *RichTable) SetCaption(cap *tgapi.RichText) *RichTable {
+	t.Caption = cap
+	return t
+}
+
+// Build returns the configured input rich-message table.
+//
+// Since: Bot API 10.2
+func (t *RichTable) Build() tgapi.InputRichBlockTable {
+	return tgapi.InputRichBlockTable{
+		Type:       tgapi.InputRichTypeTable,
+		Cells:      t.Cells,
+		IsBordered: t.IsBordered,
+		IsStriped:  t.IsStriped,
+		Caption:    t.Caption,
+	}
+}
+
+// Details creates a collapsed details block.
+//
+// Since: Bot API 10.2
+func Details(sum tgapi.RichText, blocks ...tgapi.InputRichBlock) tgapi.InputRichBlockDetails {
+	return tgapi.InputRichBlockDetails{Type: tgapi.InputRichTypeDetails, Summary: sum, Blocks: blocks}
+}
+
+// DetailsOpen creates a details block expanded by default.
+//
+// Since: Bot API 10.2
+func DetailsOpen(sum tgapi.RichText, blocks ...tgapi.InputRichBlock) tgapi.InputRichBlockDetails {
+	return tgapi.InputRichBlockDetails{Type: tgapi.InputRichTypeDetails, Summary: sum, Blocks: blocks, IsOpen: true}
+}
+
+// Map creates a map block centered on loc.
+//
+// Zoom accepts 0-24; width and height accept 0-10000 subject to Telegram's
+// total-size and aspect-ratio restrictions.
+//
+// Since: Bot API 10.2
+func Map(loc tgapi.Location, zoom uint8, width, height uint16) tgapi.InputRichBlockMap {
+	return tgapi.InputRichBlockMap{Type: tgapi.InputRichTypeMap, Location: loc, Zoom: zoom, Width: width, Height: height}
+}
+
+// MapWithCaption creates a map block with a caption.
+//
+// Since: Bot API 10.2
+func MapWithCaption(loc tgapi.Location, zoom uint8, width, height uint16, caption tgapi.RichBlockCaption) tgapi.InputRichBlockMap {
+	return tgapi.InputRichBlockMap{Type: tgapi.InputRichTypeMap, Location: loc, Zoom: zoom, Width: width, Height: height, Caption: &caption}
+}
+
+// Animation creates an animation block without a caption.
+//
+// Since: Bot API 10.2
+func Animation(animation tgapi.InputMedia) tgapi.InputRichBlockAnimation {
+	animation.Type = tgapi.InputMediaTypeAnimation
+	return tgapi.InputRichBlockAnimation{Type: tgapi.InputRichTypeAnimation, Animation: animation}
+}
+
+// AnimationWithCaption creates an animation block with a caption.
+//
+// Since: Bot API 10.2
+func AnimationWithCaption(animation tgapi.InputMedia, caption tgapi.RichBlockCaption) tgapi.InputRichBlockAnimation {
+	block := Animation(animation)
+	block.Caption = &caption
+	return block
+}
+
+// Audio creates a music-file block without a caption.
+//
+// Since: Bot API 10.2
+func Audio(audio tgapi.InputMedia) tgapi.InputRichBlockAudio {
+	audio.Type = tgapi.InputMediaTypeAudio
+	return tgapi.InputRichBlockAudio{Type: tgapi.InputRichTypeAudio, Audio: audio}
+}
+
+// AudioWithCaption creates a music-file block with a caption.
+//
+// Since: Bot API 10.2
+func AudioWithCaption(audio tgapi.InputMedia, caption tgapi.RichBlockCaption) tgapi.InputRichBlockAudio {
+	block := Audio(audio)
+	block.Caption = &caption
+	return block
+}
+
+// Photo creates a photo block without a caption.
+//
+// Since: Bot API 10.2
+func Photo(photo tgapi.InputMedia) tgapi.InputRichBlockPhoto {
+	photo.Type = tgapi.InputMediaTypePhoto
+	return tgapi.InputRichBlockPhoto{Type: tgapi.InputRichTypePhoto, Photo: photo}
+}
+
+// PhotoWithCaption creates a photo block with a caption.
+//
+// Since: Bot API 10.2
+func PhotoWithCaption(photo tgapi.InputMedia, caption tgapi.RichBlockCaption) tgapi.InputRichBlockPhoto {
+	block := Photo(photo)
+	block.Caption = &caption
+	return block
+}
+
+// Video creates a video block without a caption.
+//
+// Since: Bot API 10.2
+func Video(video tgapi.InputMedia) tgapi.InputRichBlockVideo {
+	video.Type = tgapi.InputMediaTypeVideo
+	return tgapi.InputRichBlockVideo{Type: tgapi.InputRichTypeVideo, Video: video}
+}
+
+// VideoWithCaption creates a video block with a caption.
+//
+// Since: Bot API 10.2
+func VideoWithCaption(video tgapi.InputMedia, caption tgapi.RichBlockCaption) tgapi.InputRichBlockVideo {
+	block := Video(video)
+	block.Caption = &caption
+	return block
+}
+
+// VoiceNote creates a voice-note block without a caption.
+//
+// Since: Bot API 10.2
+func VoiceNote(voiceNote tgapi.InputMedia) tgapi.InputRichBlockVoiceNote {
+	voiceNote.Type = tgapi.InputMediaTypeVoiceNote
+	return tgapi.InputRichBlockVoiceNote{Type: tgapi.InputRichTypeVoiceNote, VoiceNote: voiceNote}
+}
+
+// VoiceNoteWithCaption creates a voice-note block with a caption.
+//
+// Since: Bot API 10.2
+func VoiceNoteWithCaption(voiceNote tgapi.InputMedia, caption tgapi.RichBlockCaption) tgapi.InputRichBlockVoiceNote {
+	block := VoiceNote(voiceNote)
+	block.Caption = &caption
+	return block
+}
+
+// Thinking creates a draft-only thinking placeholder block.
+//
+// Since: Bot API 10.2
+func Thinking(text tgapi.RichText) tgapi.InputRichBlockThinking {
+	return tgapi.InputRichBlockThinking{Type: tgapi.InputRichTypeThinking, Text: text}
+}

tgrich/input_fmt_test.go

@@ -0,0 +1,44 @@
+package tgrich
+
+import (
+	"testing"
+
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+)
+
+func TestMediaConstructorsSetTypes(t *testing.T) {
+	cases := []struct {
+		name      string
+		blockType tgapi.InputRichType
+		mediaType tgapi.InputMediaType
+	}{
+		{"animation", Animation(tgapi.InputMedia{Media: "animation"}).Type, Animation(tgapi.InputMedia{Media: "animation"}).Animation.Type},
+		{"audio", Audio(tgapi.InputMedia{Media: "audio"}).Type, Audio(tgapi.InputMedia{Media: "audio"}).Audio.Type},
+		{"photo", Photo(tgapi.InputMedia{Media: "photo"}).Type, Photo(tgapi.InputMedia{Media: "photo"}).Photo.Type},
+		{"video", Video(tgapi.InputMedia{Media: "video"}).Type, Video(tgapi.InputMedia{Media: "video"}).Video.Type},
+		{"voice note", VoiceNote(tgapi.InputMedia{Media: "voice"}).Type, VoiceNote(tgapi.InputMedia{Media: "voice"}).VoiceNote.Type},
+	}
+
+	for _, tt := range cases {
+		t.Run(tt.name, func(t *testing.T) {
+			if string(tt.blockType) != string(tt.mediaType) {
+				t.Errorf("block type = %q, media type = %q", tt.blockType, tt.mediaType)
+			}
+		})
+	}
+}
+
+func TestMediaConstructorWithCaption(t *testing.T) {
+	caption := tgapi.RichBlockCaption{Text: tgapi.RichTextPlain("caption")}
+	if block := AnimationWithCaption(tgapi.InputMedia{Media: "animation"}, caption); block.Caption == nil || *block.Caption != caption {
+		t.Fatal("AnimationWithCaption did not preserve the caption")
+	}
+}
+
+func TestOlPreservesCheckboxState(t *testing.T) {
+	item := NewListItem(P(Text("item"))).SetCheckbox().SetChecked().Build()
+	list := Ol(OlOpts{}, item)
+	if len(list.Items) != 1 || !list.Items[0].HasCheckbox || !list.Items[0].IsChecked {
+		t.Fatalf("Ol() item = %#v", list.Items)
+	}
+}

tgrich/utils.go

@@ -0,0 +1,41 @@
+package tgrich
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+)
+
+func escapeHTML(s string) string {
+	s = strings.ReplaceAll(s, "&", "&")
+	s = strings.ReplaceAll(s, "<", "&lt;")
+	s = strings.ReplaceAll(s, ">", "&gt;")
+	s = strings.ReplaceAll(s, `"`, "&quot;")
+	return s
+}
+func formatAttrs(attrs map[string]string) []string {
+	out := make([]string, 0, len(attrs))
+	for k, v := range attrs {
+		if v == "" {
+			out = append(out, k)
+			continue
+		}
+		out = append(out, fmt.Sprintf(`%s="%s"`, k, escapeHTML(v)))
+	}
+	sort.Strings(out)
+	return out
+}
+
+func openTag(name string, attrs []string) string {
+	if len(attrs) == 0 {
+		return "<" + name + ">"
+	}
+	return "<" + name + " " + strings.Join(attrs, " ") + ">"
+}
+
+func selfClosingTag(name string, attrs []string) string {
+	if len(attrs) == 0 {
+		return "<" + name + "/>"
+	}
+	return "<" + name + " " + strings.Join(attrs, " ") + "/>"
+}

tgrich/validate.go

@@ -0,0 +1,472 @@
+package tgrich
+
+import (
+	"fmt"
+	"math"
+	"strings"
+	"unicode/utf8"
+
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+)
+
+type richValidator struct {
+	chars         int
+	blocks        int
+	media         int
+	allowThinking bool
+}
+
+func validateRichBlocks(blocks []tgapi.InputRichBlock, allowThinking bool) error {
+	v := &richValidator{allowThinking: allowThinking}
+	for _, block := range blocks {
+		if err := v.block(block, 0); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (v *richValidator) addChars(s string) error {
+	v.chars += utf8.RuneCountInString(s)
+	if v.chars > maxRichTextChars {
+		return ErrRichTextTooLong
+	}
+	return nil
+}
+
+func (v *richValidator) addBlocks(n int) error {
+	v.blocks += n
+	if v.blocks > maxRichBlocks {
+		return ErrRichTooManyBlocks
+	}
+	return nil
+}
+
+func (v *richValidator) addMedia(media tgapi.InputMedia, want tgapi.InputMediaType) error {
+	if media.Type != want || media.Media == "" {
+		return fmt.Errorf("%w: got %q, want %q", ErrRichInvalidMedia, media.Type, want)
+	}
+	v.media++
+	if v.media > maxRichMedia {
+		return ErrRichTooManyMedia
+	}
+	return nil
+}
+
+func expectBlockType(got, want tgapi.InputRichType) error {
+	if got != want {
+		return fmt.Errorf("%w: got %q, want %q", ErrRichInvalidBlockType, got, want)
+	}
+	return nil
+}
+
+func validListItemType(t tgapi.RichBlockListItemType) bool {
+	switch t {
+	case tgapi.InputRichBlockListItemTypeLower,
+		tgapi.InputRichBlockListItemTypeUpper,
+		tgapi.InputRichBlockListItemTypeRomanLow,
+		tgapi.InputRichBlockListItemTypeRomanUpper,
+		tgapi.InputRichBlockListItemTypeDecimal:
+		return true
+	default:
+		return false
+	}
+}
+
+func validateTableCell(cell tgapi.RichBlockTableCell) error {
+	if cell.ColSpan < 0 || cell.RowSpan < 0 {
+		return ErrRichInvalidTableCell
+	}
+	switch cell.Align {
+	case "", "left", "center", "right":
+	default:
+		return ErrRichInvalidTableCell
+	}
+	switch cell.VAlign {
+	case "", "top", "middle", "bottom":
+	default:
+		return ErrRichInvalidTableCell
+	}
+	return nil
+}
+
+func validateMap(block tgapi.InputRichBlockMap) error {
+	if math.IsNaN(block.Location.Latitude) || math.IsInf(block.Location.Latitude, 0) ||
+		math.IsNaN(block.Location.Longitude) || math.IsInf(block.Location.Longitude, 0) ||
+		block.Location.Latitude < -90 || block.Location.Latitude > 90 ||
+		block.Location.Longitude < -180 || block.Location.Longitude > 180 ||
+		block.Zoom > 24 || block.Width > 10000 || block.Height > 10000 ||
+		uint32(block.Width)+uint32(block.Height) > 10000 {
+		return ErrRichInvalidMap
+	}
+	if block.Width != 0 && block.Height != 0 {
+		longer := float64(block.Width)
+		shorter := float64(block.Height)
+		if longer < shorter {
+			longer, shorter = shorter, longer
+		}
+		if longer/shorter > 20 {
+			return ErrRichInvalidMap
+		}
+	}
+	return nil
+}
+
+func (v *richValidator) text(text tgapi.RichText, depth int) error {
+	switch el := text.(type) {
+	case nil:
+		return nil
+	case tgapi.RichTextPlain:
+		return v.addChars(string(el))
+	case tgapi.RichTextArray:
+		for _, item := range el {
+			if err := v.text(item, depth); err != nil {
+				return err
+			}
+		}
+		return nil
+	case tgapi.RichTextCustomEmoji:
+		return v.addChars(el.AlternativeText)
+	case tgapi.RichTextMathematicalExpression:
+		return v.addChars(el.Expression)
+	case tgapi.RichTextAnchor:
+		return nil
+	}
+
+	if depth >= maxRichDepth {
+		return ErrRichNestingTooDeep
+	}
+
+	var child tgapi.RichText
+	switch el := text.(type) {
+	case tgapi.RichTextWrap:
+	case tgapi.RichTextURL:
+	case tgapi.RichTextEmailAddress:
+	case tgapi.RichTextPhoneNumber:
+	case tgapi.RichTextBankCardNumber:
+		if err := validateAutomaticEntity(el.Text, el.BankCardNumber); err != nil {
+			return err
+		}
+	case tgapi.RichTextMention:
+		if err := validateAutomaticEntity(el.Text, "@"+strings.TrimPrefix(el.Username, "@")); err != nil {
+			return err
+		}
+	case tgapi.RichTextHashtag:
+		if err := validateAutomaticEntity(el.Text, "#"+strings.TrimPrefix(el.Hashtag, "#")); err != nil {
+			return err
+		}
+	case tgapi.RichTextCashtag:
+		if err := validateAutomaticEntity(el.Text, "$"+strings.TrimPrefix(el.Cashtag, "$")); err != nil {
+			return err
+		}
+	case tgapi.RichTextBotCommand:
+		if err := validateAutomaticEntity(el.Text, "/"+strings.TrimPrefix(el.BotCommand, "/")); err != nil {
+			return err
+		}
+	case tgapi.RichTextAnchorLink:
+	case tgapi.RichTextReference:
+	case tgapi.RichTextReferenceLink:
+	case tgapi.RichTextDateTime:
+	case tgapi.RichTextTextMention:
+		child = el.Text
+	default:
+		return ErrRichUnknownTag
+	}
+	return v.text(child, depth+1)
+}
+
+func validateAutomaticEntity(text tgapi.RichText, semantic string) error {
+	visible, err := visibleRichText(text)
+	if err != nil {
+		return err
+	}
+	if visible != semantic {
+		return fmt.Errorf("%w: visible %q, semantic %q", ErrRichEntityMismatch, visible, semantic)
+	}
+	return nil
+}
+
+func visibleRichText(text tgapi.RichText) (string, error) {
+	switch el := text.(type) {
+	case nil:
+		return "", nil
+	case tgapi.RichTextPlain:
+		return string(el), nil
+	case tgapi.RichTextArray:
+		var result strings.Builder
+		for _, item := range el {
+			part, err := visibleRichText(item)
+			if err != nil {
+				return "", err
+			}
+			result.WriteString(part)
+		}
+		return result.String(), nil
+	case tgapi.RichTextCustomEmoji:
+		return el.AlternativeText, nil
+	case tgapi.RichTextMathematicalExpression:
+		return el.Expression, nil
+	case tgapi.RichTextAnchor:
+		return "", nil
+	case tgapi.RichTextWrap:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextURL:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextEmailAddress:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextPhoneNumber:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextBankCardNumber:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextMention:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextHashtag:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextCashtag:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextBotCommand:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextAnchorLink:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextReference:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextReferenceLink:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextDateTime:
+		return visibleRichText(el.Text)
+	case tgapi.RichTextTextMention:
+		return visibleRichText(el.Text)
+	default:
+		return "", ErrRichUnknownTag
+	}
+}
+
+func (v *richValidator) caption(caption *tgapi.RichBlockCaption, depth int) error {
+	if caption == nil {
+		return nil
+	}
+	if err := v.text(caption.Text, depth); err != nil {
+		return err
+	}
+	return v.text(caption.Credit, depth)
+}
+
+func (v *richValidator) nested(blocks []tgapi.InputRichBlock, depth int) error {
+	for _, block := range blocks {
+		if err := v.block(block, depth); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (v *richValidator) block(block tgapi.InputRichBlock, depth int) error {
+	if depth >= maxRichDepth {
+		return ErrRichNestingTooDeep
+	}
+	if err := v.addBlocks(1); err != nil {
+		return err
+	}
+
+	switch el := block.(type) {
+	case tgapi.InputRichBlockParagraph:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeParagraph); err != nil {
+			return err
+		}
+		return v.text(el.Text, depth+1)
+	case tgapi.InputRichBlockSectionHeading:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeSectionHeading); err != nil {
+			return err
+		}
+		if el.Size < 1 || el.Size > 6 {
+			return ErrRichInvalidHeading
+		}
+		return v.text(el.Text, depth+1)
+	case tgapi.InputRichBlockPreformatted:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypePre); err != nil {
+			return err
+		}
+		return v.text(el.Text, depth+1)
+	case tgapi.InputRichBlockFooter:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeFooter); err != nil {
+			return err
+		}
+		return v.text(el.Text, depth+1)
+	case tgapi.InputRichBlockDivider:
+		return expectBlockType(el.Type, tgapi.InputRichTypeDivider)
+	case tgapi.InputRichBlockAnchor:
+		return expectBlockType(el.Type, tgapi.InputRichTypeAnchor)
+	case tgapi.InputRichBlockMath:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeMathematicalExpression); err != nil {
+			return err
+		}
+		return v.addChars(el.Expression)
+	case tgapi.InputRichBlockList:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeList); err != nil {
+			return err
+		}
+		if err := v.addBlocks(len(el.Items)); err != nil {
+			return err
+		}
+		ordered := false
+		unordered := false
+		for _, item := range el.Items {
+			if item.IsChecked && !item.HasCheckbox {
+				return ErrRichInvalidCheckbox
+			}
+			if item.Type == "" {
+				unordered = true
+				if item.Value != 0 {
+					return ErrRichInvalidListItem
+				}
+			} else {
+				ordered = true
+				if !validListItemType(item.Type) {
+					return ErrRichInvalidListItemType
+				}
+			}
+			if err := v.nested(item.Blocks, depth+1); err != nil {
+				return err
+			}
+		}
+		if ordered && unordered {
+			return ErrRichListItemMix
+		}
+		return nil
+	case tgapi.InputRichBlockBlockQuotation:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeBlockQuotation); err != nil {
+			return err
+		}
+		if err := v.textValue(el.Credit, depth+1); err != nil {
+			return err
+		}
+		return v.nested(el.Blocks, depth+1)
+	case tgapi.InputRichBlockPullQuotation:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypePullQuotation); err != nil {
+			return err
+		}
+		if err := v.text(el.Text, depth+1); err != nil {
+			return err
+		}
+		return v.textValue(el.Credit, depth+1)
+	case tgapi.InputRichBlockCollage:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeCollage); err != nil {
+			return err
+		}
+		if err := v.caption(el.Caption, depth+1); err != nil {
+			return err
+		}
+		return v.nested(el.Blocks, depth+1)
+	case tgapi.InputRichBlockSlideshow:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeSlideshow); err != nil {
+			return err
+		}
+		if err := v.caption(el.Caption, depth+1); err != nil {
+			return err
+		}
+		return v.nested(el.Blocks, depth+1)
+	case tgapi.InputRichBlockTable:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeTable); err != nil {
+			return err
+		}
+		if err := v.addBlocks(len(el.Cells)); err != nil {
+			return err
+		}
+		if err := v.textValue(el.Caption, depth+1); err != nil {
+			return err
+		}
+		for _, row := range el.Cells {
+			columns := 0
+			for _, cell := range row {
+				if err := validateTableCell(cell); err != nil {
+					return err
+				}
+				span := cell.ColSpan
+				if span < 1 {
+					span = 1
+				}
+				columns += span
+				if err := v.text(cell.Text, depth+1); err != nil {
+					return err
+				}
+			}
+			if columns > maxTableColumns {
+				return ErrRichTableTooWide
+			}
+		}
+		return nil
+	case tgapi.InputRichBlockDetails:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeDetails); err != nil {
+			return err
+		}
+		if err := v.text(el.Summary, depth+1); err != nil {
+			return err
+		}
+		return v.nested(el.Blocks, depth+1)
+	case tgapi.InputRichBlockMap:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeMap); err != nil {
+			return err
+		}
+		if err := validateMap(el); err != nil {
+			return err
+		}
+		return v.caption(el.Caption, depth+1)
+	case tgapi.InputRichBlockAnimation:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeAnimation); err != nil {
+			return err
+		}
+		if err := v.addMedia(el.Animation, tgapi.InputMediaTypeAnimation); err != nil {
+			return err
+		}
+		return v.caption(el.Caption, depth+1)
+	case tgapi.InputRichBlockAudio:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeAudio); err != nil {
+			return err
+		}
+		if err := v.addMedia(el.Audio, tgapi.InputMediaTypeAudio); err != nil {
+			return err
+		}
+		return v.caption(el.Caption, depth+1)
+	case tgapi.InputRichBlockPhoto:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypePhoto); err != nil {
+			return err
+		}
+		if err := v.addMedia(el.Photo, tgapi.InputMediaTypePhoto); err != nil {
+			return err
+		}
+		return v.caption(el.Caption, depth+1)
+	case tgapi.InputRichBlockVideo:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeVideo); err != nil {
+			return err
+		}
+		if err := v.addMedia(el.Video, tgapi.InputMediaTypeVideo); err != nil {
+			return err
+		}
+		return v.caption(el.Caption, depth+1)
+	case tgapi.InputRichBlockVoiceNote:
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeVoiceNote); err != nil {
+			return err
+		}
+		if err := v.addMedia(el.VoiceNote, tgapi.InputMediaTypeVoiceNote); err != nil {
+			return err
+		}
+		return v.caption(el.Caption, depth+1)
+	case tgapi.InputRichBlockThinking:
+		if !v.allowThinking {
+			return ErrRichThinkingDraftOnly
+		}
+		if err := expectBlockType(el.Type, tgapi.InputRichTypeThinking); err != nil {
+			return err
+		}
+		return v.text(el.Text, depth+1)
+	default:
+		return ErrRichUnknownTag
+	}
+}
+
+func (v *richValidator) textValue(text *tgapi.RichText, depth int) error {
+	if text == nil {
+		return nil
+	}
+	return v.text(*text, depth)
+}

update_context.go

@@ -130,6 +130,20 @@ func (bot *Bot[T]) prepareUpdateCtx(u *tgapi.Update, ctx *MessageContext) {
 				from = u.EditedBusinessMessage.From
 			}
 		}
+	case tgapi.UpdateTypeGuestMessage:
+		if u.GuestMessage != nil {
+			ctx.Msg = u.GuestMessage
+			if u.GuestMessage.Chat != nil {
+				chat = u.GuestMessage.Chat
+			}
+			if u.GuestMessage.From != nil {
+				from = u.GuestMessage.From
+			}
+		}
+	case tgapi.UpdateTypeDeletedBusinessMessages:
+		if u.DeletedBusinessMessages != nil {
+			chat = &u.DeletedBusinessMessages.Chat
+		}
 	case tgapi.UpdateTypeInlineQuery:
 		if u.InlineQuery != nil {
 			from = &u.InlineQuery.From
@@ -187,23 +201,43 @@ func (bot *Bot[T]) prepareUpdateCtx(u *tgapi.Update, ctx *MessageContext) {
 		}
 	case tgapi.UpdateTypePollAnswer:
 		if u.PollAnswer != nil {
-			from = &u.PollAnswer.User
+			if u.PollAnswer.User.ID != 0 {
+				from = &u.PollAnswer.User
+			} else if u.PollAnswer.VoterChat.ID != 0 {
+				chat = &u.PollAnswer.VoterChat
+			}
 		}
 	case tgapi.UpdateTypeMessageReaction:
 		if u.MessageReaction != nil {
 			from = u.MessageReaction.User
 			chat = u.MessageReaction.Chat
 		}
+	case tgapi.UpdateTypeMessageReactionCount:
+		if u.MessageReactionCount != nil {
+			chat = u.MessageReactionCount.Chat
+		}
 	case tgapi.UpdateTypeChatBoost:
 		if u.ChatBoost != nil {
-			from = &u.ChatBoost.Boost.Source.User
+			if u.ChatBoost.Boost.Source.User.ID != 0 {
+				from = &u.ChatBoost.Boost.Source.User
+			}
 			chat = &u.ChatBoost.Chat
 		}
 	case tgapi.UpdateTypeRemovedChatBoost:
 		if u.RemovedChatBoost != nil {
-			from = &u.RemovedChatBoost.Source.User
+			if u.RemovedChatBoost.Source.User.ID != 0 {
+				from = &u.RemovedChatBoost.Source.User
+			}
 			chat = &u.RemovedChatBoost.Chat
 		}
+	case tgapi.UpdateTypeManagedBot:
+		if u.ManagedBot != nil {
+			from = &u.ManagedBot.User
+		}
+	case tgapi.UpdateTypeSubscription:
+		if u.Subscription != nil {
+			from = &u.Subscription.User
+		}
 	}
 	if ctx.Msg != nil && from == nil {
 		from = ctx.Msg.From

utils.go

@@ -8,7 +8,9 @@ import (
 )
 
 // Ptr returns a pointer to v.
-func Ptr[T any](v T) *T { return &v }
+//
+//go:fix inline
+func Ptr[T any](v T) *T { return new(v) }
 
 // Val returns dereferenced pointer value or def when p is nil.
 func Val[T any](p *T, def T) T {
@@ -36,5 +38,5 @@ func generateToken(b int) (string, error) {
 	if _, err := rand.Read(bytes); err != nil {
 		return "", err
 	}
-	return base64.URLEncoding.EncodeToString(bytes), nil
+	return base64.RawURLEncoding.EncodeToString(bytes), nil
 }

utils/limiter.go

@@ -157,9 +157,8 @@ func (rl *RateLimiter) GlobalAllow() bool {
 	return limiter.Allow()
 }
 
-// Allow checks if a request for the given chat can be made without blocking.
-// Returns false if: global cooldown, chat cooldown, global limiter, or chat limiter denies.
-// Note: Global limiter is checked before chat limiter — upstream limits take priority.
+// Allow checks whether a request for the given chat can be made without blocking.
+// A rejected chat reservation does not consume global capacity.
 func (rl *RateLimiter) Allow(chatID int64) bool {
 	// Check global cooldown
 	rl.globalMu.RLock()
@@ -177,15 +176,27 @@ func (rl *RateLimiter) Allow(chatID int64) bool {
 		return false
 	}
 
-	// Check global token bucket
-	limiter := rl.getGlobalLimiter()
-	if limiter != nil && !limiter.Allow() {
-		return false
+	now := time.Now()
+	globalLimiter := rl.getGlobalLimiter()
+	var globalReservation *rate.Reservation
+	if globalLimiter != nil {
+		globalReservation = globalLimiter.ReserveN(now, 1)
+		if !globalReservation.OK() || globalReservation.DelayFrom(now) > 0 {
+			globalReservation.CancelAt(now)
+			return false
+		}
 	}
 
-	// Check chat token bucket
 	chatLimiter := rl.getChatLimiter(chatID)
-	return chatLimiter.Allow()
+	chatReservation := chatLimiter.ReserveN(now, 1)
+	if !chatReservation.OK() || chatReservation.DelayFrom(now) > 0 {
+		chatReservation.CancelAt(now)
+		if globalReservation != nil {
+			globalReservation.CancelAt(now)
+		}
+		return false
+	}
+	return true
 }
 
 // Check applies rate limiting based on configuration.

utils/limiter_test.go

@@ -5,6 +5,8 @@ import (
 	"errors"
 	"testing"
 	"time"
+
+	"golang.org/x/time/rate"
 )
 
 func TestRateLimiterCheckDropOverflowHonorsGlobalLock(t *testing.T) {
@@ -28,6 +30,25 @@ func TestRateLimiterChatLocksAreScopedPerChat(t *testing.T) {
 	}
 }
 
+func TestRateLimiterRejectedChatDoesNotConsumeGlobalCapacity(t *testing.T) {
+	rl := NewRateLimiter()
+	rl.SetGlobalRate(1)
+
+	if !rl.Allow(42) {
+		t.Fatal("expected initial request for chat 42 to succeed")
+	}
+	rl.globalMu.Lock()
+	rl.globalLimiter = rate.NewLimiter(1, 1)
+	rl.globalMu.Unlock()
+
+	if rl.Allow(42) {
+		t.Fatal("expected exhausted chat limiter to reject the request")
+	}
+	if !rl.Allow(7) {
+		t.Fatal("expected rejected chat request not to consume global capacity")
+	}
+}
+
 func TestRateLimiterGlobalWaitRespectsContextCancellation(t *testing.T) {
 	rl := NewRateLimiter()
 	rl.SetGlobalLock(1)

utils/version.go

@@ -2,13 +2,13 @@ package utils
 
 const (
 	// VersionString is the module version string.
-	VersionString = "1.0.1"
+	VersionString = "1.1.0"
 	// VersionMajor is the module major version.
 	VersionMajor = 1
 	// VersionMinor is the module minor version.
-	VersionMinor = 0
+	VersionMinor = 1
 	// VersionPatch is the module patch version.
-	VersionPatch = 1
+	VersionPatch = 0
 	// VersionBeta is the prerelease counter for the current version.
 	VersionBeta = 0
 )

utils_test.go

@@ -0,0 +1,21 @@
+package laniakea
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestGenerateTokenUsesRawURLAlphabet(t *testing.T) {
+	token, err := generateToken(32)
+	if err != nil {
+		t.Fatalf("generateToken returned error: %v", err)
+	}
+	if strings.Contains(token, "=") {
+		t.Fatalf("token contains forbidden padding: %q", token)
+	}
+	for _, r := range token {
+		if !strings.ContainsRune("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-", r) {
+			t.Fatalf("token contains a character forbidden by Telegram: %q", r)
+		}
+	}
+}