sendSticker method

src/telegram.js

@@ -315,6 +315,26 @@ TelegramBot.prototype.sendDocument = function (chatId, doc, options) {
   return this._request('sendDocument', opts);
 };
 
+/**
+ * Send .webp stickers.
+ * @param  {Number|String} chatId  Unique identifier for the message recipient
+ * @param  {String|stream.Stream} 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#sendsticker
+ */
+TelegramBot.prototype.sendSticker = function (chatId, sticker, options) {
+  var opts = {
+    qs: options || {}
+  };
+  opts.qs.chat_id = chatId;
+  var content = this._formatSendData('sticker', sticker);
+  opts.formData = content[0];
+  opts.qs.sticker = content[1];
+  return this._request('sendSticker', opts);
+};
+
 /**
  * Send chat action.
  * `typing` for text messages,

test/index.js

@@ -241,5 +241,45 @@ describe('Telegram', function () {
       });
     });
   });
-  
+
+  describe('#sendSticker', function () {
+    var stickerId;
+    it('should send a sticker from file', function (done) {
+      var bot = new Telegram(TOKEN);
+      var sticker = __dirname+'/sticker.webp';
+      bot.sendSticker(USERID, sticker).then(function (resp) {
+        resp.should.be.an.instanceOf(Object);
+        stickerId = resp.sticker.file_id;
+        done();
+      });
+    });
+
+    it('should send a sticker from id', function (done) {
+      var bot = new Telegram(TOKEN);
+      // Send the same photo as before
+      bot.sendSticker(USERID, stickerId).then(function (resp) {
+        resp.should.be.an.instanceOf(Object);
+        done();
+      });
+    });
+
+    it('should send a sticker from fs.readStream', function (done) {
+      var bot = new Telegram(TOKEN);
+      var sticker = fs.createReadStream(__dirname+'/sticker.webp');
+      bot.sendSticker(USERID, sticker).then(function (resp) {
+        resp.should.be.an.instanceOf(Object);
+        done();
+      });
+    });
+
+    it('should send a sticker from request Stream', function (done) {
+      var bot = new Telegram(TOKEN);
+      var sticker = request('https://www.gstatic.com/webp/gallery3/1_webp_ll.webp');
+      bot.sendSticker(USERID, sticker).then(function (resp) {
+        resp.should.be.an.instanceOf(Object);
+        done();
+      });
+    });
+  });
+
 });