Add base wrappers for mtproto

mtproto/consts.go

@@ -0,0 +1,32 @@
+package mtproto
+
+// SeqNo* is the number of the sequence which have special meaning for
+// the Telegram.
+const (
+	SeqNoNonce     = -2
+	SeqNoHandshake = -1
+)
+
+// Different constants for RPC protocol
+var (
+	TagCloseExt     = []byte{0xa2, 0x34, 0xb6, 0x5e}
+	TagProxyAns     = []byte{0x0d, 0xda, 0x03, 0x44}
+	TagSimpleAck    = []byte{0x9b, 0x40, 0xac, 0x3b}
+	TagHandshake    = []byte{0xf5, 0xee, 0x82, 0x76}
+	TagNonce        = []byte{0xaa, 0x87, 0xcb, 0x7a}
+	TagProxyRequest = []byte{0xee, 0xf1, 0xce, 0x36}
+
+	NonceCryptoAES = []byte{0x01, 0x00, 0x00, 0x00}
+
+	HandshakeFlags = []byte{0x00, 0x00, 0x00, 0x00}
+
+	ProxyRequestExtraSize = []byte{0x18, 0x00, 0x00, 0x00}
+	ProxyRequestProxyTag  = []byte{0xae, 0x26, 0x1e, 0xdb}
+
+	HandshakeSenderPID = []byte("IPIPPRPDTIME")
+	HandshakePeerPID   = []byte("IPIPPRPDTIME")
+
+	HandshakeRequest = append(TagHandshake,
+		append(HandshakeFlags,
+			append(HandshakeSenderPID, HandshakePeerPID...)...)...)
+)

mtproto/proxy_flags.go

@@ -0,0 +1,59 @@
+package mtproto
+
+import (
+	"encoding/binary"
+	"strings"
+)
+
+type proxyRequestFlags uint32
+
+const (
+	proxyRequestFlagsHasAdTag     proxyRequestFlags = 0x8
+	proxyRequestFlagsEncrypted    proxyRequestFlags = 0x2
+	proxyRequestFlagsMagic        proxyRequestFlags = 0x1000
+	proxyRequestFlagsExtMode2     proxyRequestFlags = 0x20000
+	proxyRequestFlagsIntermediate proxyRequestFlags = 0x20000000
+	proxyRequestFlagsAbdridged    proxyRequestFlags = 0x40000000
+	proxyRequestFlagsQuickAck     proxyRequestFlags = 0x80000000
+	proxyRequestFlagsPad          proxyRequestFlags = 0x8000000
+)
+
+var proxyRequestFlagsEncryptedPrefix [8]byte
+
+func (r proxyRequestFlags) Bytes() []byte {
+	converted := make([]byte, 4)
+	binary.LittleEndian.PutUint32(converted, uint32(r))
+
+	return converted
+}
+
+func (r proxyRequestFlags) String() string {
+	flags := make([]string, 0, 7)
+
+	if r&proxyRequestFlagsHasAdTag != 0 {
+		flags = append(flags, "HAS_AD_TAG")
+	}
+	if r&proxyRequestFlagsEncrypted != 0 {
+		flags = append(flags, "ENCRYPTED")
+	}
+	if r&proxyRequestFlagsMagic != 0 {
+		flags = append(flags, "MAGIC")
+	}
+	if r&proxyRequestFlagsExtMode2 != 0 {
+		flags = append(flags, "EXT_MODE_2")
+	}
+	if r&proxyRequestFlagsIntermediate != 0 {
+		flags = append(flags, "INTERMEDIATE")
+	}
+	if r&proxyRequestFlagsAbdridged != 0 {
+		flags = append(flags, "ABRIDGED")
+	}
+	if r&proxyRequestFlagsQuickAck != 0 {
+		flags = append(flags, "QUICK_ACK")
+	}
+	if r&proxyRequestFlagsPad != 0 {
+		flags = append(flags, "PAD")
+	}
+
+	return strings.Join(flags, " | ")
+}