src/telegram: Emit 'info' on stream from TelegramBot#getFileStream()

test/utils.js

@@ -30,6 +30,13 @@ exports = module.exports = {
    * @return {Promise}
    */
   isPollingMockServer,
+  /**
+   * Return true if the string is a URI to a file
+   * on Telegram servers.
+   * @param  {String} uri
+   * @return {Boolean}
+   */
+  isTelegramFileURI,
   /**
    * Send a message to the webhook at the specified port and path.
    * @param  {Number} port
@@ -217,3 +224,8 @@ function handleRatelimit(bot, methodName, suite) {
   };
   return bot;
 }
+
+
+function isTelegramFileURI(uri) {
+  return /https?:\/\/.*\/file\/bot.*\/.*/.test(uri);
+}