Parse.com PHP Facebook Login with JavaScript

There is little documentation out there showing how to successfully create a new Parse user using PHP – Facebook login method. Here is the steps that worked for me:

  • Add  Facebook PHP-SDK in your web app
  • Add Facebook SDK for JavaScript. Include the Facebook login button.
  • Initialize a Facebook session. (Facebook App ID and App Secret). In your php code it should look like this:

$fb = new Facebook([
'app_id' =>'YOUr APP ID',
'app_secret' =>'YOUR APP SECRET',
'default_graph_version' => 'v2.5',
]);

  • Authenticate user with Facebook (clicking the javascript login button). Follow the facebook Javascript login button guide here:

Once the users authenticates via the login button. We will use the php javascript helper to retrieve the values to php.


$helper = $fb->getJavaScriptHelper();
 $oAuth2Client = $fb->getOAuth2Client();
 try {
 $accessToken = $helper->getAccessToken(); //getting short lived token
 $token = $accessToken;

 } catch(Facebook\Exceptions\FacebookResponseException $e) {
 // When Graph returns an error
 echo 'Graph returned an error: ' . $e->getMessage();
 
 } catch(Facebook\Exceptions\FacebookSDKException $e) {
 // When validation fails or other local issues
 echo 'Facebook SDK returned an error: ' . $e->getMessage();
 
 }

  • Get the user’s Facebook ID.

Once we have the token. We can get the long lived token and use that to retrieve the users Facebook values:


<strong></strong>

$longLivedAccessToken = $oAuth2Client->getLongLivedAccessToken($token);
$longToken = $longLivedAccessToken->getValue();

$fb->setDefaultAccessToken($longLivedAccessToken);
 
 $response = $fb->get('/me?fields=id, email'); //retrieving users id and email

$user = $response->getGraphUser();
 $id = $user['id'];
 $email = $user['email'];

  • Authenticate the user with Parse with ID and access code.

ParseUser::logInWithFacebook($id, $longToken);

 

 

Here is the full php and js code. You’ll have to refresh the page a few times to show the user is created and logged in.


<?php 
use Facebook\Facebook as Facebook;
use Parse\ParseUser;
use Parse\ParseClient;
?>
<!DOCTYPE html>
<html>
    <head>
        <title>TEST PHP</title>

        <link href="https://fonts.googleapis.com/css?family=Lato:100" rel="stylesheet" type="text/css">

        <style>
            html, body {
                height: 100%;
            }

            body {
                margin: 0;
                padding: 0;
                width: 100%;
                display: table;
                font-weight: 100;
                font-family: 'Lato';
            }

            .container {
                text-align: center;
                display: table-cell;
                vertical-align: middle;
            }

            .content {
                text-align: center;
                display: inline-block;
            }

            .title {
                font-size: 96px;
            }
        </style>
    </head>
    <body>
	
	<div id="fb-root"></div>
<div id="fb-root"></div>
<script>


function statusChangeCallback(response) {
    console.log('statusChangeCallback');
    console.log(response);
    // The response object is returned with a status field that lets the
    // app know the current login status of the person.
    // Full docs on the response object can be found in the documentation
    // for FB.getLoginStatus().
    if (response.status === 'connected') {
      // Logged into your app and Facebook.
      testAPI();
    } else if (response.status === 'not_authorized') {
      // The person is logged into Facebook, but not your app.
      document.getElementById('status').innerHTML = 'Please log ' +
        'into this app.';
    } else {
      // The person is not logged into Facebook, so we're not sure if
      // they are logged into this app or not.
      document.getElementById('status').innerHTML = 'Please log ' +
        'into Facebook.';
    }
  }

  // This function is called when someone finishes with the Login
  // Button.  See the onlogin handler attached to it in the sample
  // code below.
  function checkLoginState() {
    FB.getLoginStatus(function(response) {
      statusChangeCallback(response);
    });
  }

  window.fbAsyncInit = function() {
  FB.init({
    appId      : 'YOUR APP ID',
    cookie     : true,  // enable cookies to allow the server to access 
                        // the session
    xfbml      : true,  // parse social plugins on this page
    version    : 'v2.5' // use graph api version 2.5
  });

  // Now that we've initialized the JavaScript SDK, we call 
  // FB.getLoginStatus().  This function gets the state of the
  // person visiting this page and can return one of three states to
  // the callback you provide.  They can be:
  //
  // 1. Logged into your app ('connected')
  // 2. Logged into Facebook, but not your app ('not_authorized')
  // 3. Not logged into Facebook and can't tell if they are logged into
  //    your app or not.
  //
  // These three cases are handled in the callback function.

  FB.getLoginStatus(function(response) {
    statusChangeCallback(response);
  });

  };


	(function(d, s, id) {
	  var js, fjs = d.getElementsByTagName(s)[0];
	  if (d.getElementById(id)) return;
	  js = d.createElement(s); js.id = id;
	  js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.6&appId=YOURAPPID";
	  fjs.parentNode.insertBefore(js, fjs);
	}
(document, 'script', 'facebook-jssdk'));



</script>
	
	
        <div class="container">
            <div class="content">
                <div class="title">TESTING</div>
				<?php 
				
				//testing login
								$fb = new Facebook([
			  'app_id' => 'YOUR APP ID',
			  'app_secret' => 'YOUR APP SECRET',
			  'default_graph_version' => 'v2.5',
			]);
			
			//first check parse
			$currentUser = ParseUser::getCurrentUser();
			
			if($currentUser){
				echo 'user is logged in, logging out';
				//ParseUser::logOut();
			}
			else{
				
			
				
				
				$helper = $fb->getJavaScriptHelper();
				$oAuth2Client = $fb->getOAuth2Client();
				try {
				  $accessToken = $helper->getAccessToken(); //getting short lived token
				  $token = $accessToken;

				  
				  
				  
				  
				} catch(Facebook\Exceptions\FacebookResponseException $e) {
				  // When Graph returns an error
				  echo 'Graph returned an error: ' . $e->getMessage();
			
				} catch(Facebook\Exceptions\FacebookSDKException $e) {
				  // When validation fails or other local issues
				  echo 'Facebook SDK returned an error: ' . $e->getMessage();
			
				}
		
				if (! isset($accessToken)) {
  echo 'No cookie set or no OAuth data could be obtained from cookie.';

}else{

// Logged in
echo '<h3>Access Token</h3>';



$longLivedAccessToken = $oAuth2Client->getLongLivedAccessToken($token);
$longToken = $longLivedAccessToken->getValue();  

				$fb->setDefaultAccessToken($longLivedAccessToken);
				
				$response = $fb->get('/me?fields=id, email');

				   $user = $response->getGraphUser();
				   $id = $user['id'];
				   $email = $user['email'];
				   
				   ParseUser::logInWithFacebook($id, $longToken); //works
			




}
			}
				?>
				<fb:login-button scope="public_profile,email" onlogin="checkLoginState();"></fb:login-button>
				<div id="status"> <?php //dispayis please login to facebook message if not logged in ?>
            </div>
        </div>
    </body>
</html>


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