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How to host your Telegram bot on Google App Script

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.

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");
}
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