[nodejs] 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);
}
 

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