facebook_bot.js

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This is a sample Facebook bot built with Botkit.

This bot demonstrates many of the core features of Botkit:

* Connect to Facebook's Messenger APIs
* Receive messages based on "spoken" patterns
* Reply to messages
* Use the conversation system to ask questions
* Use the built in storage system to store and retrieve information
  for a user.

# RUN THE BOT:

  Follow the instructions here to set up your Facebook app and page:

    -> https://developers.facebook.com/docs/messenger-platform/implementation

  Run your bot from the command line:

    page_token=<MY PAGE TOKEN> verify_token=<MY_VERIFY_TOKEN> node facebook_bot.js [--lt [--ltsubdomain LOCALTUNNEL_SUBDOMAIN]]

  Use the --lt option to make your bot available on the web through localtunnel.me.

# USE THE BOT:

  Find your bot inside Facebook to send it a direct message.

  Say: "Hello"

  The bot will reply "Hello!"

  Say: "who are you?"

  The bot will tell you its name, where it running, and for how long.

  Say: "Call me <nickname>"

  Tell the bot your nickname. Now you are friends.

  Say: "who am I?"

  The bot will tell you your nickname, if it knows one for you.

  Say: "shutdown"

  The bot will ask if you are sure, and then shut itself down.

  Make sure to invite your bot into other channels using /invite @<my bot>!

# EXTEND THE BOT:

  Botkit has many features for building cool and useful bots!

  Read all about it here:

    -> http://howdy.ai/botkit

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/


if (!process.env.page_token) {
    console.log('Error: Specify page_token in environment');
    process.exit(1);
}

if (!process.env.verify_token) {
    console.log('Error: Specify verify_token in environment');
    process.exit(1);
}

var Botkit = require('./lib/Botkit.js');
var os = require('os');
var commandLineArgs = require('command-line-args');
var localtunnel = require('localtunnel');

const cli = commandLineArgs([
      {name: 'lt', alias: 'l', args: 1, description: 'Use localtunnel.me to make your bot available on the web.',
      type: Boolean, defaultValue: false},
      {name: 'ltsubdomain', alias: 's', args: 1,
      description: 'Custom subdomain for the localtunnel.me URL. This option can only be used together with --lt.',
      type: String, defaultValue: null},
   ]);

const ops = cli.parse();
if(ops.lt === false && ops.ltsubdomain !== null) {
    console.log("error: --ltsubdomain can only be used together with --lt.");
    process.exit();
}

var controller = Botkit.facebookbot({
    debug: true,
    access_token: process.env.page_token,
    verify_token: process.env.verify_token,
});

var bot = controller.spawn({
});

controller.setupWebserver(process.env.port || 3000, function(err, webserver) {
    controller.createWebhookEndpoints(webserver, bot, function() {
        console.log('ONLINE!');
        if(ops.lt) {
            var tunnel = localtunnel(process.env.port || 3000, {subdomain: ops.ltsubdomain}, function(err, tunnel) {
                if (err) {
                    console.log(err);
                    process.exit();
                }
                console.log("Your bot is available on the web at the following URL: " + tunnel.url + '/facebook/receive');
            });

            tunnel.on('close', function() {
                console.log("Your bot is no longer available on the web at the localtunnnel.me URL.");
                process.exit();
            });
        }
    });
});


controller.hears(['hello', 'hi'], 'message_received', function(bot, message) {
    controller.storage.users.get(message.user, function(err, user) {
        if (user && user.name) {
            bot.reply(message, 'Hello ' + user.name + '!!');
        } else {
            bot.reply(message, 'Hello.');
        }
    });
});


controller.hears(['structured'], 'message_received', function(bot, message) {

    bot.startConversation(message, function(err, convo) {
        convo.ask({
            attachment: {
                'type': 'template',
                'payload': {
                    'template_type': 'generic',
                    'elements': [
                        {
                            'title': 'Classic White T-Shirt',
                            'image_url': 'http://petersapparel.parseapp.com/img/item100-thumb.png',
                            'subtitle': 'Soft white cotton t-shirt is back in style',
                            'buttons': [
                                {
                                    'type': 'web_url',
                                    'url': 'https://petersapparel.parseapp.com/view_item?item_id=100',
                                    'title': 'View Item'
                                },
                                {
                                    'type': 'web_url',
                                    'url': 'https://petersapparel.parseapp.com/buy_item?item_id=100',
                                    'title': 'Buy Item'
                                },
                                {
                                    'type': 'postback',
                                    'title': 'Bookmark Item',
                                    'payload': 'White T-Shirt'
                                }
                            ]
                        },
                        {
                            'title': 'Classic Grey T-Shirt',
                            'image_url': 'http://petersapparel.parseapp.com/img/item101-thumb.png',
                            'subtitle': 'Soft gray cotton t-shirt is back in style',
                            'buttons': [
                                {
                                    'type': 'web_url',
                                    'url': 'https://petersapparel.parseapp.com/view_item?item_id=101',
                                    'title': 'View Item'
                                },
                                {
                                    'type': 'web_url',
                                    'url': 'https://petersapparel.parseapp.com/buy_item?item_id=101',
                                    'title': 'Buy Item'
                                },
                                {
                                    'type': 'postback',
                                    'title': 'Bookmark Item',
                                    'payload': 'Grey T-Shirt'
                                }
                            ]
                        }
                    ]
                }
            }
        }, function(response, convo) {
            // whoa, I got the postback payload as a response to my convo.ask!
            convo.next();
        });
    });
});

controller.on('facebook_postback', function(bot, message) {

    bot.reply(message, 'Great Choice!!!! (' + message.payload + ')');

});


controller.hears(['call me (.*)', 'my name is (.*)'], 'message_received', function(bot, message) {
    var name = message.match[1];
    controller.storage.users.get(message.user, function(err, user) {
        if (!user) {
            user = {
                id: message.user,
            };
        }
        user.name = name;
        controller.storage.users.save(user, function(err, id) {
            bot.reply(message, 'Got it. I will call you ' + user.name + ' from now on.');
        });
    });
});

controller.hears(['what is my name', 'who am i'], 'message_received', function(bot, message) {
    controller.storage.users.get(message.user, function(err, user) {
        if (user && user.name) {
            bot.reply(message, 'Your name is ' + user.name);
        } else {
            bot.startConversation(message, function(err, convo) {
                if (!err) {
                    convo.say('I do not know your name yet!');
                    convo.ask('What should I call you?', function(response, convo) {
                        convo.ask('You want me to call you `' + response.text + '`?', [
                            {
                                pattern: 'yes',
                                callback: function(response, convo) {
                                    // since no further messages are queued after this,
                                    // the conversation will end naturally with status == 'completed'
                                    convo.next();
                                }
                            },
                            {
                                pattern: 'no',
                                callback: function(response, convo) {
                                    // stop the conversation. this will cause it to end with status == 'stopped'
                                    convo.stop();
                                }
                            },
                            {
                                default: true,
                                callback: function(response, convo) {
                                    convo.repeat();
                                    convo.next();
                                }
                            }
                        ]);

                        convo.next();

                    }, {'key': 'nickname'}); // store the results in a field called nickname

                    convo.on('end', function(convo) {
                        if (convo.status == 'completed') {
                            bot.reply(message, 'OK! I will update my dossier...');

                            controller.storage.users.get(message.user, function(err, user) {
                                if (!user) {
                                    user = {
                                        id: message.user,
                                    };
                                }
                                user.name = convo.extractResponse('nickname');
                                controller.storage.users.save(user, function(err, id) {
                                    bot.reply(message, 'Got it. I will call you ' + user.name + ' from now on.');
                                });
                            });



                        } else {
                            // this happens if the conversation ended prematurely for some reason
                            bot.reply(message, 'OK, nevermind!');
                        }
                    });
                }
            });
        }
    });
});

controller.hears(['shutdown'], 'message_received', function(bot, message) {

    bot.startConversation(message, function(err, convo) {

        convo.ask('Are you sure you want me to shutdown?', [
            {
                pattern: bot.utterances.yes,
                callback: function(response, convo) {
                    convo.say('Bye!');
                    convo.next();
                    setTimeout(function() {
                        process.exit();
                    }, 3000);
                }
            },
        {
            pattern: bot.utterances.no,
            default: true,
            callback: function(response, convo) {
                convo.say('*Phew!*');
                convo.next();
            }
        }
        ]);
    });
});


controller.hears(['uptime', 'identify yourself', 'who are you', 'what is your name'], 'message_received',
    function(bot, message) {

        var hostname = os.hostname();
        var uptime = formatUptime(process.uptime());

        bot.reply(message,
            ':|] I am a bot. I have been running for ' + uptime + ' on ' + hostname + '.');
    });



controller.on('message_received', function(bot, message) {
    bot.reply(message, 'Try: `what is my name` or `structured` or `call me captain`');
    return false;
});


function formatUptime(uptime) {
    var unit = 'second';
    if (uptime > 60) {
        uptime = uptime / 60;
        unit = 'minute';
    }
    if (uptime > 60) {
        uptime = uptime / 60;
        unit = 'hour';
    }
    if (uptime != 1) {
        unit = unit + 's';
    }

    uptime = uptime + ' ' + unit;
    return uptime;
}