node-telegram-api/lib/types/Message.js

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2015-06-28 22:42:48 +00:00
import Base from './Base';
/**
* Message class, used to send message to a chat
*/
export default class Message extends Base {
/**
* Create a new message
* @param {object} properties Message properties, as defined by Telegram API
*/
constructor(properties = {}) {
super();
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 text of the message
* @param {string} text Message's content
* @return {object} returns the message object
*/
text(text) {
this.properties.text = 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;
}
/**
* Sends the message, you should only use this method yourself if
* you are extending this class. Normally you should call bot.send(message)
*
* Events: message:sent => Emitted after sending the message to API, gets the
* API's response
*
* message:answer => Emitted when your message gets an answer from
* the contact (reply in case of groups)
* gets the Update object containing message
*
* @param {object} bot
* @return {promise} returns a promise, resolved with message:answer
*/
send(bot) {
let messageId;
const reply_markup = JSON.stringify(this._keyboard.getProperties());
this.properties.reply_markup = reply_markup;
return new Promise(resolve => {
bot.api.sendMessage(this.properties).then(response => {
messageId = response.result.message_id;
this.emit('message:sent', response);
});
if (this._keyboard.one_time_keyboard) {
this._keyboard.replyMarkup = '';
}
const chat = this.properties.chat_id;
bot.on('update', function listener(result) {
const update = result.find(({message}) => {
// if in a group, there will be a reply to this message
if (chat < 0) {
return message.chat.id === chat &&
message.reply_to_message.message_id === messageId;
} else {
return message.chat.id === chat;
}
});
if (update) {
resolve(update);
this.emit('message:answer', update);
bot.removeListener('update', listener);
}
});
});
}
}