websocket + facebook api

[Marcelo Pignataro]

Hi,

I need to send a notification from a websocket server to a websocket client when a facebook user send a message to a facebook web page. To receive facebook message I'm using a facebook messenger api and ws module to send a notification from node.js that runs a websocket server to websocket client. So I don't know how code it, I read both guide of tools but I could make it work. 

Next code I take from a facebook example (https://github.com/fbsamples/messenger-platform-samples/blob/master/node/app.js):

app.post('/webhook', function (req, res) {

var data = req.body;

if (data.object == 'page') {

data.entry.forEach(function(pageEntry) {

var pageID = pageEntry.id;

var timeOfEvent = pageEntry.time; pageEntry.messaging.forEach(function(messagingEvent) { if (messagingEvent.optin) { . . . } else if (messagingEvent.message) { receivedMessage(messagingEvent); } else {

.

.

}

});

)};

function receivedMessage(event) {

var senderID = event.sender.id; var recipientID = event.recipient.id; var timeOfMessage = event.timestamp; var message = event.message;

.

.

.

var messageText = message.text;

         if (messageText) {

                 switch (messageText) {

                             .

                             .

                        default:

                            sendTextMessage(senderID, messageText);

                 }

         } else if (messageAttachments) {

                    .

                    .

         }

     }

function sendTextMessage(recipientId, messageText) {

/*

*              I NEED TO SEND A MESSAGE TO A WEBSOCKET CLIENT INSIDE THIS FUNCTION

*/

  var messageData = {

    recipient: {

      id: recipientId

    },

    message: {

      text: 'buen dia',

      metadata: "DEVELOPER_DEFINED_METADATA"

    }

  };

  callSendAPI(messageData);

}