Connect Botkit or BotBuilder to Facebook Messenger.
This package contains an adapter that communicates directly with the Facebook Messenger API, and translates messages to and from a standard format used by your bot. This package can be used alongside your favorite bot development framework to build bots that work with Facebook Messenger.
Add this package to your project using npm:
npm install --save botbuilder-adapter-facebookImport the adapter class into your code:
const { FacebookAdapter } = require('botbuilder-adapter-facebook');If you are starting a brand new project, follow these instructions to create a customized application template.
FacebookAdapter provides a translation layer for Botkit and BotBuilder so that bot developers can connect to Facebook Messenger and have access to Facebook's API.
When used in concert with Botkit, developers need only pass the configured adapter to the Botkit constructor, as seen below. Botkit will automatically create and configure the webhook endpoints and other options necessary for communicating with Facebook.
Developers can then bind to Botkit's event emitting system using controller.on and controller.hears to filter and handle incoming events from the messaging platform. Learn more about Botkit's core feature →.
const adapter = new FacebookAdapter({
verify_token: process.env.FACEBOOK_VERIFY_TOKEN,
app_secret: process.env.FACEBOOK_APP_SECRET,
access_token: process.env.FACEBOOK_ACCESS_TOKEN
});
adapter.use(new FacebookEventTypeMiddleware());
const controller = new Botkit({
adapter,
// ...other options
});
controller.on('message', async(bot, message) => {
await bot.reply(message, 'I heard a message!');
});Alternately, developers may choose to use FacebookAdapter with BotBuilder. With BotBuilder, the adapter is used more directly with a webserver, and all incoming events are handled as Activities.
const { FacebookAdapter } = require('botbuilder-adapter-facebook');
const restify = require('restify');
const adapter = new FacebookAdapter({
verify_token: process.env.FACEBOOK_VERIFY_TOKEN,
app_secret: process.env.FACEBOOK_APP_SECRET,
access_token: process.env.FACEBOOK_ACCESS_TOKEN
});
const server = restify.createServer();
server.use(restify.plugins.bodyParser());
server.use(restify.plugins.queryParser());
server.get('/api/messages', (req, res) => {
if (req.query['hub.mode'] === 'subscribe') {
if (req.query['hub.verify_token'] === process.env.FACEBOOK_VERIFY_TOKEN) {
const val = req.query['hub.challenge'];
res.sendRaw(200, val);
} else {
console.log('failed to verify endpoint');
res.send('OK');
}
}
});
server.post('/api/messages', (req, res) => {
adapter.processActivity(req, res, async(context) => {
await context.sendActivity('I heard a message!');
});
});
server.listen(process.env.port || process.env.PORT || 3000, () => {
console.log(`\n${ server.name } listening to ${ server.url }`);
});In the examples above, the FacebookAdapter constructor received a single access_token parameters. This binds the adapter and all API calls it makes to a single Facebook page.
To use FacebookAdapter with multiple Facebook pages, the constructor must receive a function as a paramter named getAccessTokenForPage that is responsible for returning a token value when provided a Facebook page ID. The application must implement its own mechanism for securely storing and retrieving the token.
const adapter = new FacebookAdapter({
verify_token: process.env.FACEBOOK_VERIFY_TOKEN,
app_secret: process.env.FACEBOOK_APP_SECRET,
getAccessTokenForPage: async(pageId) => {
// do something to fetch the page access token for pageId.
return token;
}
});Botkit event types are controlled by the FacebookEventMiddleware.
Without this middleware applied, Botkit bots will receive message events when a user types a message or clicks a postback_button, and an event event for all other types of event received from Facebook.
Most Botkit developers who plan to use features above and beyond Facebook's send API should enable this middleware.
This package also includes a minimal Facebook API client for developers who want to use one of the many available API endpoints.
In Botkit handlers, the bot worker object passed into all handlers will contain a bot.api field that contains the client, preconfigured and ready to use.
To use with a BotBuilder application, the adapter provides the getAPI() method.
controller.on('message', async(bot, message) {
// call the facebook API to get the bot's page identity
let identity = await bot.api.callAPI('/me', 'GET', {});
await bot.reply(message,`My name is ${ identity.name }`);
});In Botkit handlers, the bot worker for Facebook contains all of the base methods as well as the following platform-specific extensions:
Botkit will automatically construct your outgoing messages according to Facebook's specifications. To use attachments, quick replies or other features, add them to the message object used to create the reply:
await bot.reply(message, {
text: 'Choose a button',
quick_replies: [
{
"content_type":"text",
"title":"Foo",
"payload":"true"
},
{
"content_type":"text",
"title":"Bar",
"payload":"false"
}
]
});For a bot that works with multiple pages, it is possible to spawn bot workers bound to a specific page by passing the page ID as the primary parameter to controller.spawn():
let bot = await controller.spawn(FACEBOOK_PAGE_ID);Use this method to initiate a conversation with a user. After calling this method, any further actions carried out by the bot worker will happen with the specified user.
This can be used to create or resume conversations with users that are not in direct response to an incoming message, like those sent on a schedule or in response to external events.
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Botkit is released under the MIT Open Source license