added sendVoice function

README.md

@@ -23,7 +23,7 @@ bot.on('text', function (msg) {
 There are some other examples on [examples](https://github.com/yagop/node-telegram-bot-api/tree/master/examples).
 
 ### Events
-Every time  TelegramBot receives a message, it emits a `message`. Depending on which  [message](https://core.telegram.org/bots/api#message) was received, emits an event from this ones: `text`, `audio`, `document`, `photo`, `sticker`, `video`, `contact`, `location`, `new_chat_participant`, `left_chat_participant`, `new_chat_title`, `new_chat_photo`, `delete_chat_photo`, `group_chat_created`. Its much better to listen a specific event rather than a `message` in order to stay safe from the content.
+Every time  TelegramBot receives a message, it emits a `message`. Depending on which  [message](https://core.telegram.org/bots/api#message) was received, emits an event from this ones: `text`, `audio`, `document`, `photo`, `sticker`, `video`, `voice`, `contact`, `location`, `new_chat_participant`, `left_chat_participant`, `new_chat_title`, `new_chat_photo`, `delete_chat_photo`, `group_chat_created`. Its much better to listen a specific event rather than a `message` in order to stay safe from the content.
 * * *
 
 
@@ -194,6 +194,22 @@ See: https://core.telegram.org/bots/api#sendvideo
 
 * **Promise**
 
+## sendVoice(chatId, A, [options])
+
+Use this method to send audio files, if you want Telegram clients to display the file as a playable voice message. For this to work, your audio must be in an .ogg file encoded with OPUS (other formats may be sent as Audio or Document).
+
+See: https://core.telegram.org/bots/api#sendvoice
+
+### Params:
+
+* **Number|String** *chatId* Unique identifier for the message recipient
+* **String|stream.Stream** *A* file path or a Stream. Can also be a `file_id` previously uploaded.
+* **Object** *[options]* Additional Telegram query options
+
+### Return:
+
+* **Promise**
+
 ## sendChatAction(chatId, action)
 
 Send chat action.

src/telegram.js

@@ -34,7 +34,7 @@ var TelegramBot = function (token, options) {
   options = options || {};
   this.token = token;
   this.messageTypes = [
-    'text', 'audio', 'document', 'photo', 'sticker', 'video', 'contact',
+    'text', 'audio', 'document', 'photo', 'sticker', 'video', 'voice', 'contact',
     'location', 'new_chat_participant', 'left_chat_participant', 'new_chat_title',
     'new_chat_photo', 'delete_chat_photo', 'group_chat_created'
   ]; // Telegram message events
@@ -301,6 +301,26 @@ TelegramBot.prototype.sendVideo = function (chatId, video, options) {
   return this._request('sendVideo', opts);
 };
 
+/**
+ * Send voice
+ * @param  {Number|String} chatId  Unique identifier for the message recipient
+ * @param  {String|stream.Stream} voice A file path or a Stream. Can
+ * also be a `file_id` previously uploaded.
+ * @param  {Object} [options] Additional Telegram query options
+ * @return {Promise}
+ * @see https://core.telegram.org/bots/api#sendvoice
+ */
+TelegramBot.prototype.sendVoice = function (chatId, voice, options) {
+  var opts = {
+    qs: options || {}
+  };
+  opts.qs.chat_id = chatId;
+  var content = this._formatSendData('voice', voice);
+  opts.formData = content[0];
+  opts.qs.voice = content[1];
+  return this._request('sendVoice', opts);
+};
+
 
 /**
  * Send chat action.

test/index.js

@@ -330,6 +330,17 @@ describe('Telegram', function () {
     });
   });
 
+  describe('#sendVoice', function () {
+    it('should send an OGG audio as voice', function (done) {
+      var bot = new Telegram(TOKEN);
+      var voice = request('https://upload.wikimedia.org/wikipedia/commons/c/c8/Example.ogg');
+      bot.sendVoice(USERID, voice).then(function (resp) {
+        resp.should.be.an.instanceOf(Object);
+        done();
+      });
+    });
+  });
+
   describe('#getUserProfilePhotos', function () {
     it('should get user profile photos', function (done) {
       var bot = new Telegram(TOKEN);