Add SendAudio method.

api.go

@@ -41,6 +41,35 @@ func NewSendPhotoParams(chatId int64, photo string, options *SendPhotoOptions) *
 	return params
 }
 
+// Send audio request params
+type SendAudioOptions struct {
+	Duration            int         `json:"duration,omitempty"`
+	Performer           string      `json:"performer,omitempty"`
+	title               string      `json:"title,omitempty"`
+	DisableNotification bool        `json:"disable_notification,omitempty"`
+	ReplyToMessageId    int64       `json:"reply_to_message_id,omitempty"`
+	ReplyMarkup         ReplyMarkup `json:"reply_markup,omitempty"`
+}
+
+type SendAudioParams struct {
+	ChatId int64  `json:"chat_id"`
+	Audio  string `json:"audio,omitempty"`
+	SendAudioOptions
+}
+
+func NewSendAudioParams(chatId int64, audio string, options *SendAudioOptions) *SendAudioParams {
+	params := &SendAudioParams{
+		ChatId: chatId,
+		Audio:  audio,
+	}
+
+	if options != nil {
+		params.SendAudioOptions = *options
+	}
+
+	return params
+}
+
 type EditMessageTextOptions struct {
 	ParseMode             ParseMode   `json:"parse_mode,omitempty"`
 	DisableWebPagePreview bool        `json:"disable_web_page_preview,omitempty"`

bot.go

@@ -189,6 +189,36 @@ func (bot *Bot) SendPhotoFile(chatId int64, file io.ReadCloser, options *SendPho
 	return message, err
 }
 
+// Send exists audio by file_id
+func (bot *Bot) SendAudio(chatId int64, audioId string, options *SendAudioOptions) (*Message, error) {
+	params := NewSendAudioParams(chatId, audioId, options)
+
+	message := new(Message)
+	err := bot.post("sendAudio", params, message)
+
+	return message, err
+}
+
+// Send audio file
+func (bot *Bot) SendAudioFile(chatId int64, file io.ReadCloser, options *SendAudioOptions) (*Message, error) {
+	params := NewSendAudioParams(chatId, "", options)
+	values, err := structToValues(params)
+	if err != nil {
+		return nil, err
+	}
+
+	fileToSend := &FileToSend{
+		File:      file,
+		Fieldname: "audio",
+		Filename:  "audio.mp3",
+	}
+
+	message := new(Message)
+	err = bot.postMultipart("sendAudio", fileToSend, values, message)
+
+	return message, err
+}
+
 // Use this method to forward messages of any kind.
 func (bot *Bot) ForwardMessage(chatId, fromChatId, messageId int64, disableNotification bool) (*Message, error) {
 	params := map[string]interface{}{