Parse.Cloud.define("loginWithFacebook", function(request) {

  var params = request.params
  var authData = params.authData
  var id = params.id
  var expiredBy = params.expiredBy

  var facebookAuthData = {
    "id": id,
    "access_token": authData,
    "expiration_date": expiredBy
  }

  Parse.FacebookUtils.logIn(facebookAuthData, { useMasterKey: true }) 
    .then(function(user) {
        if (user.isNew()) {
            console.log("NEW User logged in with id " + user.id + " with session token : " + user.sessionToken)
        } else {
          console.log("Existing User logged in with id " + user.id + " with session token : " + user.sessionToken)
        }
    })
    .catch(function(error) {
      console.log('ERROR','loginWithFacebook() - Error with facebook login : '+ error);
      throw error
    })
  
})

func processFBLogin() {
        
        if let accessToken = AccessToken.current {
            
            logger.debug("Facebook user logged in with toke \(accessToken.appID)- \(accessToken.tokenString)")
            
            PFCloud.callFunction(inBackground: "loginWithFacebook", withParameters: ["id":accessToken.userID, "authData":accessToken.tokenString, "expiredBy":accessToken.expirationDate], block: {
                
                (response: Any?, error: Error?) -> Void in
                
                if error == nil {

                    if let loggedinUser = PFUser.current() {
                        logger.debug("FB login successful - sessiontoken \(loggedinUser.sessionToken) ")
                    } else {
                        
                        logger.debug("FB login failed ")
                        
                    }

                } else {
                    
                    logger.error("Error with facebook login \(String(describing: error?.localizedDescription))")
                }
            })
            
        } else {
            
            logger.info("No FB token available")
        }

    }

 info: Ran cloud function loginWithFacebook for user undefined with:
   Input: {"id":"xxxxxxxxxx","expiredBy":"2020-05-24T15:48:42.018Z","authData":"adasdasdasdasdasdasda"}
   Result: undefined {"functionName":"loginWithFacebook","params":{"id":"xxxxxxxxxx","expiredBy":"2020-05-24T15:48:42.018Z","authData":"adasdasdasdasdasdasda"}}
 verbose: RESPONSE from [POST] /parse/functions/loginWithFacebook: {
   "response": {}
 } {"result":{"response":{}}}
 verbose: REQUEST for [POST] /parse/users: {
   "authData": {
     "facebook": {
       "id": "xxxxxxxxxx",
       "access_token": "adasdasdasdasdasdasda",
       "expiration_date": {
         "__type": "Date",
         "iso": "2020-05-24T15:48:42.018Z"
       }
     }
   }
 } {"method":"POST","url":"/parse/users","headers":{"host":"myApp.herokuapp.com","connection":"close","user-agent":"node-XMLHttpRequest, Parse/js2.11.0 (NodeJS 13.11.0)","accept":"*/*","content-type":"text/plain","x-request-id":"c9ec003f-70c6-4b03-bb2e-acbda997836b","x-forwarded-for":"54.92.152.225","x-forwarded-proto":"https","x-forwarded-port":"443","via":"1.1 vegur","connect-time":"1","x-request-start":"1585152709435","total-route-time":"0","content-length":"569"},"body":{"authData":{"facebook":{"id":"xxxxxx","access_token":"adasdasdasdasdasdasda","expiration_date":{"__type":"Date","iso":"2020-05-24T15:48:42.018Z"}}}}}
 heroku/router at=info method=POST path="/parse/functions/loginWithFacebook" host=myApp.herokuapp.com request_id=2d5de5a0-f465-4387-aa7a-e4c3f575566c fwd="122.169.14.163" dyno=web.1 connect=1ms service=14ms status=200 bytes=625 protocol=https
 heroku/router at=info method=POST path="/parse/users" host=myApp.herokuapp.com request_id=c9ec003f-70c6-4b03-bb2e-acbda997836b fwd="54.92.152.225" dyno=web.1 connect=1ms service=298ms status=201 bytes=794 protocol=https
 verbose: RESPONSE from [POST] /parse/users: {
   "status": 201,
   "response": {
     "objectId": "efsyICJCAq",
     "createdAt": "2020-03-25T16:11:49.440Z",
     "username": "hDTtBCA6oSpZGDR7a9kpemoFC"
   },
   "location": "http://myApp.herokuapp.com/parse/users/efsyICJCAq"
 } {"result":{"status":201,"response":{"objectId":"efsyICJCAq","createdAt":"2020-03-25T16:11:49.440Z","username":"sdfsdfsdfsdf"},"location":"http://myApp.herokuapp.com/parse/users/efsyICJCAq"}}
 Existing User logged in with id efsyICJCAq with session token : undefined

RestWrite.prototype.createSessionTokenIfNeeded = function() {

logger.info('Message - createSessionTokenIfNeeded - For class - ' + this.className)
  if (this.className !== '_User') {
    return;
  }
  // Don't generate session for updating user (this.query is set) unless authData exists
  if (this.query && !this.data.authData) {
    return;
  }
  logger.info('Message - createSessionTokenIfNeeded - Not update call - going ahead')

  // Don't generate new sessionToken if linking via sessionToken
  if (this.auth.user && this.data.authData) {
    return;
  }
  logger.info('Message - createSessionTokenIfNeeded - not linking so going ahead')

  if (
    !this.storage['authProvider'] && // signup call, with (THIS IS FAILING)
    this.config.preventLoginWithUnverifiedEmail && // no login without verification
    this.config.verifyUserEmails
  ) {
    // verification is on
    logger.info('Message - createSessionTokenIfNeeded - returning as no auth provider, preventLoginWihoutEmail, verifyEmail')   
    logger.info('Message - createSessionTokenIfNeeded - authProvider = ' + this.storage['authProvider'] + ' preventLoginWihoutEmail = ' + this.config.preventLoginWithUnverifiedEmail + ' verifyUserEmails = ' + this.config.verifyUserEmails)
    return; // do not create the session token in that case!
  }
  logger.info('Message - createSessionTokenIfNeeded - before calling - return this.createSessionToken()' )

  return this.createSessionToken();
};