Switch from form-data to restler, a lot better :thumbs_up:

lib/types/File.js

@@ -0,0 +1,90 @@
+import Base from './Base';
+import mime from 'mime';
+
+const TYPES = ['photo', 'video', 'document', 'audio'];
+
+/**
+ * File class, used to send pictures/movies/audios/documents to chat
+ */
+export default class File extends Base {
+  /**
+   * Create a new file instance
+   * @param  {object} properties File properties, as defined by Telegram API
+   */
+  constructor(properties = {}) {
+    super('sendMessage');
+
+    this.properties = properties;
+    this._keyboard = new Base();
+  }
+
+  /**
+   * Set chat_id of the message
+   * @param  {number} chat
+   * @return {object} returns the message object
+   */
+  to(chat) {
+    this.properties.chat_id = chat;
+    return this;
+  }
+
+  /**
+   * Set file of the message
+   * @param  {ReadableStream} stream File Stream
+   * @param {string} fileType (optional) if the first argument is a
+   *                          file_id string, this option indicates file type
+   * @return {object} returns the message object
+   */
+  file(stream, fileType) {
+    if (typeof stream === 'string') {
+      this.properties[fileType] = stream;
+    }
+
+    let type = mime.lookup(stream.path).split('/')[0];
+    if (type === 'image') {
+      type = 'photo';
+    }
+
+    if (TYPES.indexOf(type) === -1) {
+      type = 'document';
+    }
+
+    this.properties[type] = stream;
+
+    return this;
+  }
+
+  /**
+   * Set caption for photos
+   * @param  {string} text caption's text
+   * @return {object} returns the message object
+   */
+  caption(text) {
+    this.properties.caption = text;
+    return this;
+  }
+
+  /**
+   * Set reply_to_message_id of the message
+   * @param  {number} id message_id of the message to reply to
+   * @return {object} returns the message object
+   */
+  reply(id) {
+    this.properties.reply_to_message_id = id;
+    return this;
+  }
+
+  /**
+   * Sets keyboard of the message
+   * The value of reply_markup is set to the sanitized keyboard properties
+   * i.e. reply_markup = JSON.stringify(kb.getProperties())
+   * @param  {object} kb A Keyboard instance
+   * @return {object} returns the message object
+   */
+  keyboard(kb) {
+    this._keyboard = kb;
+    return this;
+  }
+
+  // This class inherits Base's send method
+}