Add implementation of telegram dialer

mtglib/internal/telegram/init.go

@@ -0,0 +1,53 @@
+package telegram
+
+import (
+	"context"
+	"net"
+)
+
+type preferIP uint8
+
+const (
+	preferIPOnlyIPv4 preferIP = iota
+	preferIPOnlyIPv6
+	preferIPPreferIPv4
+	preferIPPreferIPv6
+)
+
+type tgAddr struct {
+	network string
+	address string
+}
+
+// https://github.com/telegramdesktop/tdesktop/blob/master/Telegram/SourceFiles/mtproto/mtproto_dc_options.cpp#L30
+var (
+	v4Addresses = [5][]tgAddr{
+		{
+			{network: "tcp4", address: "149.154.175.50:443"},
+		},
+		{
+			{network: "tcp4", address: "149.154.167.51:443"},
+			{network: "tcp4", address: "95.161.76.100:443"},
+		},
+		{
+			{network: "tcp4", address: "149.154.175.100:443"},
+		},
+		{
+			{network: "tcp4", address: "149.154.167.91:443"},
+		},
+		{
+			{network: "tcp4", address: "149.154.171.5"},
+		},
+	}
+	v6Addresses = [5]tgAddr{
+		{network: "tcp6", address: "[2001:b28:f23d:f001::a]:443"},
+		{network: "tcp6", address: "[2001:67c:04e8:f002::a]:443"},
+		{network: "tcp6", address: "[2001:b28:f23d:f003::a]:443"},
+		{network: "tcp6", address: "[2001:67c:04e8:f004::a]:443"},
+		{network: "tcp6", address: "[2001:b28:f23f:f005::a]:443"},
+	}
+)
+
+type Dialer interface {
+	DialContext(ctx context.Context, network, address string) (net.Conn, error)
+}