Facebook API Question posted in
The official documentation for the Facebook APIs can be found here.

How can I send a file to Facebook Send API using npm's Request without uploading the file? – Facebook api

I’m implementing a bot that uses Facebook’s Send API. According to the documentation it is possible to send files using a request. The documentation offers two methods, one sending a URL to the file and the other uploading the file. I don’t want to upload the file and give it a URL as this is an open source library that doesn’t want to assume anything about the implementation.

I do want to upload the file directly. The documentation for uploading the file uses cURL for the example and looks as follows:

curl  
  -F recipient='{"id":"USER_ID"}' 
  -F message='{"attachment":{"type":"file", "payload":{}}}' 
  -F filedata=@/tmp/receipt.pdf 
  "https://graph.facebook.com/v2.6/me/messages?access_token=PAGE_ACCESS_TOKEN"

My current take is that it should look something like this:

facebook_message.access_token = configuration.access_token;
var fileReaderStream = fs.createReadStream('./sampleData.json')
var formData = {
                "recipient": JSON.stringify({
                  "id":message.channel
               }),
               "attachment": JSON.stringify({
                  "type":"file", 
                  "payload":{}
               }),
               "filedata": fileReaderStream
               }

request({
         "method": 'POST',
         "json": true,
         "formData": formData,
         "uri": 'https://graph.facebook.com/v2.6/me/messages?access_token=' + configuration.access_token
        },
        function(err, res, body) {
               //***
        });

When I run this I receive the following response:

{ 
  message: '(#100) Must send either message or state',
  type: 'OAuthException',
  code: 100,
  error_subcode: 2018015,
  fbtrace_id: '***' 
 }
Tags:

2

Answers


  1. 0

    The official example app includes a function for file uploads via URL: https://github.com/fbsamples/messenger-platform-samples/blob/master/node/app.js

    This is the relevant function:

    function sendFileMessage(recipientId) {
  var messageData = {
    recipient: {
      id: recipientId
    },
    message: {
      attachment: {
        type: "file",
        payload: {
          url: SERVER_URL + "/assets/test.txt"
        }
      }
    }
  };

  callSendAPI(messageData);
}

    If you really want to do it the hard way, take a look at the request module docs: https://www.npmjs.com/package/request#forms
    Check out the example code with “formData” in the section. You are using “form”, which seems to be for regular data.

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  2. 0

    The error you are receiving is because "attachment":{} needs to be inside an object called message. You must send either a message or sender_action object with facebook send API.

    var formData = {
                "recipient": JSON.stringify({
                  "id":message.channel
               }),
               "message": JSON.stringify({
               "attachment": {
                  "type":"file",
                  "payload":{}
              }
          }),
               "filedata": fileReaderStream

               }

    Facebook should accept your api call after this, however I was unable to display a jpg file sent using your code. Perhaps it will work with your JSON file

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