unnikked/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Telegram Bot on Google App Script

This is the source code of one of my blog post. To read the full blog post please click here.

  
## bot.js
var token = 'xxx';

function doPost(e) {
  // Make sure to only reply to json requests
  if(e.postData.type == "application/json") {

    // Parse the update sent from Telegram
    var update = JSON.parse(e.postData.contents);

    // Instantiate our bot passing the update
    var bot = new Bot(token, update);

    // Building commands
    var bus = new CommandBus();
    bus.on(/\/start/, function () {
      this.replyToSender("Congratulations! It works!");
    });

    bus.on(/\/joke\s*([A-Za-z0-9_]+)?\s*([A-Za-z0-9_]+)?/, randomJoke);

    // Register the command bus
    bot.register(bus);

    // If the update is valid, process it
    if (update) {
      bot.process();
    }
  }
}

function setWebhook() {
  var bot = new Bot(token, {});
  var result = bot.request('setWebhook', {
    url: // publish your app and put your /excec URL here
  });

  Logger.log(result);
}

function randomJoke(name, surname) {
  var firstName = name || null;
  var lastName = surname || null;

  var url = 'http://api.icndb.com/jokes/random?escape=javascript';

  if (firstName) url += '&firstName=' + firstName;
  if (lastName) url += '&lastName=' + lastName;

  var data = JSON.parse(UrlFetchApp.fetch(url).getContentText());

  this.replyToSender(data.value.joke);
}

function Bot (token, update) {
  this.token = token;
  this.update = update;
  this.handlers = [];
}

Bot.prototype.register = function ( handler) {
  this.handlers.push(handler);
}

Bot.prototype.process = function () {
  for (var i in this.handlers) {
    var event = this.handlers[i];
    var result = event.condition(this);
    if (result) {
      return event.handle(this);
    }
  }
}

Bot.prototype.request = function (method, data) {
  var options = {
    'method' : 'post',
    'contentType': 'application/json',
    'payload' : JSON.stringify(data)
  };

  var response = UrlFetchApp.fetch('https://api.telegram.org/bot' + this.token + '/' + method, options);

  if (response.getResponseCode() == 200) {
    return JSON.parse(response.getContentText());
  }

  return false;
}

Bot.prototype.replyToSender = function (text) {
  return this.request('sendMessage', {
    'chat_id': this.update.message.from.id,
    'text': text
  });
}

function CommandBus() {
  this.commands = [];
}

CommandBus.prototype.on = function (regexp, callback) {
  this.commands.push({'regexp': regexp, 'callback': callback});
}

CommandBus.prototype.condition = function (bot) {
  return bot.update.message.text.charAt(0) === '/';
}

CommandBus.prototype.handle = function (bot) {
  for (var i in this.commands) {
    var cmd = this.commands[i];
    var tokens = cmd.regexp.exec(bot.update.message.text);
    if (tokens != null) {
      return cmd.callback.apply(bot, tokens.splice(1));
    }
  }
  return bot.replyToSender("Invalid command");
}
	var token = 'xxx';

	function doPost(e) {
	// Make sure to only reply to json requests
	if(e.postData.type == "application/json") {

	// Parse the update sent from Telegram
	var update = JSON.parse(e.postData.contents);

	// Instantiate our bot passing the update
	var bot = new Bot(token, update);

	// Building commands
	var bus = new CommandBus();
	bus.on(/\/start/, function () {
	this.replyToSender("Congratulations! It works!");
	});

	bus.on(/\/joke\s([A-Za-z0-9_]+)?\s([A-Za-z0-9_]+)?/, randomJoke);

	// Register the command bus
	bot.register(bus);

	// If the update is valid, process it
	if (update) {
	bot.process();
	}
	}
	}

	function setWebhook() {
	var bot = new Bot(token, {});
	var result = bot.request('setWebhook', {
	url: // publish your app and put your /excec URL here
	});

	Logger.log(result);
	}

	function randomJoke(name, surname) {
	var firstName = name \|\| null;
	var lastName = surname \|\| null;

	var url = 'http://api.icndb.com/jokes/random?escape=javascript';

	if (firstName) url += '&firstName=' + firstName;
	if (lastName) url += '&lastName=' + lastName;

	var data = JSON.parse(UrlFetchApp.fetch(url).getContentText());

	this.replyToSender(data.value.joke);
	}

	function Bot (token, update) {
	this.token = token;
	this.update = update;
	this.handlers = [];
	}

	Bot.prototype.register = function ( handler) {
	this.handlers.push(handler);
	}

	Bot.prototype.process = function () {
	for (var i in this.handlers) {
	var event = this.handlers[i];
	var result = event.condition(this);
	if (result) {
	return event.handle(this);
	}
	}
	}

	Bot.prototype.request = function (method, data) {
	var options = {
	'method' : 'post',
	'contentType': 'application/json',
	'payload' : JSON.stringify(data)
	};

	var response = UrlFetchApp.fetch('https://api.telegram.org/bot' + this.token + '/' + method, options);

	if (response.getResponseCode() == 200) {
	return JSON.parse(response.getContentText());
	}

	return false;
	}

	Bot.prototype.replyToSender = function (text) {
	return this.request('sendMessage', {
	'chat_id': this.update.message.from.id,
	'text': text
	});
	}

	function CommandBus() {
	this.commands = [];
	}

	CommandBus.prototype.on = function (regexp, callback) {
	this.commands.push({'regexp': regexp, 'callback': callback});
	}

	CommandBus.prototype.condition = function (bot) {
	return bot.update.message.text.charAt(0) === '/';
	}

	CommandBus.prototype.handle = function (bot) {
	for (var i in this.commands) {
	var cmd = this.commands[i];
	var tokens = cmd.regexp.exec(bot.update.message.text);
	if (tokens != null) {
	return cmd.callback.apply(bot, tokens.splice(1));
	}
	}
	return bot.replyToSender("Invalid command");
	}