Public

Process.env

Process.exit

ProcessEnv.NODE_ENV

Process.on

Process.cwd

ProcessEnv.PUBLIC_URL

Process.stdout

Process.argv

ProcessEnv.PORT

ProcessEnv.HTTPS

ProcessEnv.NODE_PATH

Process.platform

Process.nextTick

ProcessEnv.CI

Process.stdin

Process.stderr

Process.pid

Process.send

Process.version

Process.versions

verify_token

MESSENGER_VERIFY_TOKEN

port

PORT

endpoint

MESSENGER_ENDPOINT

app_secret

MESSENGER_APP_SECRET

indexOf

express

json

addWebhookEndpoint

addVerifyEndpoint

listen

bind

once

emit

close

error

validateSignedRequest

Webhook

/**
 * Creates and starts a webhook that emits all received webhook events.
 * @constructor
 * @class Webhook
 * @param {Object} options  Configuration options for your webhook. All options may also be set as environment variables.
 * @param {string} options.verify_token  May also be set as `MESSENGER_VERIFY_TOKEN` in environment variables.
 * @param {string} options.endpoint  _Optional._ Defaults to `/webhook`. May also be set as `MESSENGER_APP_ENDPOINT` in environment variables.
 * @param {string} options.app_secret  _Optional._ Your app secret. Required for `validateSignedRequest()`. May also be set as `MESSENGER_APP_SECRET` in environment variables.
 * @param {string} options.port    _Optional._ Defaults to `1337`. May also be set as `MESSENGER_PORT` in environment variables.
 * @returns {Webhook}
 * @example
 * const Messenger = require('messenger-node');
 *
 * // you can also set these as env vars
 * let options = {
 *   'verify_token': 'my_voice_is_my_passport',
 *   'app_secret': 'ih908wh084ggh423940hg934g358h0358hg3', //optional
 *   'endpoint': '/awesomewebhook' //optional
 *   'port': '9485' //optional
 * }
 * const Webhook = new Messenger.Webhook(options);
 */

'VERIFY_TOKEN required to create webhook!'

/**
   * Adds an event listener. Implements Node.js EventEmitter's [`emitter.on`](https://nodejs.org/api/events.html#events_emitter_on_eventname_listener).
   * @param {String} event_name  The name of the event to listen for.
   * @param {Function} callback  The callback to execute when the event is received.
   * @function on
   * @memberof  Webhook
   * @example
   * Webhook.on('messaging_postbacks', (event_type, sender_info, webhook_event) => {
   *   // do something 
   * });   
   */

/**
   * Adds a one-time event listener that will be removed after it is called once. Implements Node.js EventEmitter's [`emitter.once`](https://nodejs.org/api/events.html#events_emitter_once_eventname_listener).
   * @param {String} event_name  The name of the event to listen for.
   * @param {Function} callback  The callback to execute when the event is received.
   * @function once
   * @memberof  Webhook
   * @example
   * Webhook.once('messaging_postbacks', (event_type, sender_info, webhook_event) => {
   *   // do something 
   * });   
   */

/**
   * Emits an event from the Webhook instance. Event listeners can be set with `Webhook.on()` and `Webhook.once()`. Implements Node.js EventEmitter's [`emitter.once`](https://nodejs.org/api/events.html#events_emitter_emit_eventname_args).
   * @param {Object} eventName The name of the event to emit.
   * @returns {Object} ...args  _Optional._ Arguments to pass to the event listener.
   * @function emit
   * @memberof  Webhook
   * @example
   * Webhook.emit('my_event', arg1, arg2);   
   */

/**
   * Retrieves the current Webhook instance. This is the express.js [`app`](http://expressjs.com/en/4x/api.html#app) instance.
   * @returns {Object} The Webhook instance.
   * @function getInstance
   * @memberof  Webhook
   * @example
   * let instance = Webhook.getInstance();
   * console.log(instance) // express.js app instance
   */

/**
   * Stops the Webhook instance.
   * @param {Function} callback  A callback function to execute when the webhook is stopped.   
   * @function stopInstance
   * @memberof  Webhook
   * @example
   * Webhook.stopInstance(() => console.log('Webhook is stopped'));
   */

/**
   * Retrieves the port the webhook is running on.
   * @returns {String} The current port number.
   * @function getPort
   * @memberof  Webhook
   * @example
   * let port = Webhook.getPort();
   * console.log(port) // '1337'
   */

/**
   * Retrieves the current endpoint of the webhook.
   * @returns {String} The current endpoint.
   * @function getEndpoint
   * @memberof  Webhook
   * @example
   * let endpoint = Webhook.getEndpoint();
   * console.log(endpoint) // '/webhook'
   */

/**
   * Retrieves the current verify token of the webhook.
   * @returns {String} The current verify token.
   * @function getVerifyToken
   * @memberof  Webhook
   * @example
   * let verifyToken = Webhook.getVerifyToken();
   * console.log(verifyToken) // 'my_verify_token'
   */

/**
   * Sets the app secret used for validating signed requests.
   * @param {String} app_secret The app secret to set.
   * @returns {String} The app secret that was successfully set.
   * @function setAppSecret
   * @memberof  Webhook
   * @example
   * let app_secret = Webhook.setAppSecret('hgr0a8h30gh30agh');
   * console.log(app_secret) // 'hgr0a8h30gh30agh'
   */

/**
   * Verifies a signed request received by calling [`getcontext()`](https://developers.facebook.com/docs/messenger-platform/webview/context) in the Messenger webview.
   * @param {Object} signed_request  The signed request.
   * @returns {Object} The decrypted signed request.
   * @function  validateSignedRequest
   * @memberof  Webhook
   * @example
   * let request = {
   *   'tid': '1254453049382119',
   *   'thread_type': 'USER_TO_PAGE', 
   *   'psid': '1254413049321919',
   *   'signed_request': 'QDTuYBidQ7pbpxIbPwgsb__nHty2...'
   * };   
   * let decrypted_request = Webhook.validateSignedRequest(signed_request);
   * 
   * console.log(decrypted_request)
   * // {
   * //   "psid": "1254413049321919", 
   * //   "algorithm": "HMAC-SHA256", 
   * //   "thread_type": "GROUP", 
   * //   "tid": "1254453049382119", 
   * //   "issued_at": 1491351619, 
   * //   "page_id": 239483560376726
   * // }
   */

'Cannot validate signed request: app_secret not set'

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