login with facebook

[Costas]

reference
https://www.webniraj.com/2014/05/01/facebook-api-php-sdk-updated-to-v4-0-0/


 

download FacebookSDK by http://github.com/facebook/facebook-php-sdk-v4
at the time of article is v4.0.11

create a FacebookApp as described here https://www.pipiscrew.com/2014/10/javascript-login-with-facebook/

plus fill out the website URL

plus enable App Secret Proof for Server API calls more at  http://developers.facebook.com/docs/graph-api/securing-requests/

upload the Facebook folder by facebook-php-sdk-v4-4.0-dev.zip\facebook-php-sdk-v4-4.0-dev\src

create a login.php as the following :

<?php
require_once( 'Facebook/HttpClients/FacebookHttpable.php' );
require_once( 'Facebook/HttpClients/FacebookCurl.php' );
require_once( 'Facebook/HttpClients/FacebookCurlHttpClient.php' );
 
require_once( 'Facebook/Entities/AccessToken.php' );
require_once( 'Facebook/Entities/SignedRequest.php' );
 
require_once( 'Facebook/FacebookSession.php' );
require_once( 'Facebook/FacebookRedirectLoginHelper.php' );
require_once( 'Facebook/FacebookRequest.php' );
require_once( 'Facebook/FacebookResponse.php' );
require_once( 'Facebook/FacebookSDKException.php' );
require_once( 'Facebook/FacebookRequestException.php' );
require_once( 'Facebook/FacebookOtherException.php' );
require_once( 'Facebook/FacebookAuthorizationException.php' );
require_once( 'Facebook/GraphObject.php' );
require_once( 'Facebook/GraphSessionInfo.php' );
 
use Facebook\HttpClients\FacebookHttpable;
use Facebook\HttpClients\FacebookCurl;
use Facebook\HttpClients\FacebookCurlHttpClient;
 
use Facebook\Entities\AccessToken;
use Facebook\Entities\SignedRequest;
 
use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookOtherException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\GraphSessionInfo;
 
// start session
session_start();
 
// init app with app id and secret
FacebookSession::setDefaultApplication('appID','secret');
 
// login helper with redirect_uri
$helper = new FacebookRedirectLoginHelper('http://x.com/testFB/playground_admin/login.php');
 
// see if a existing session exists
if ( isset( $_SESSION ) && isset( $_SESSION['fb_token'] ) ) {
  // create new session from saved access_token
  $session = new FacebookSession( $_SESSION['fb_token'] );
  
  // validate the access_token to make sure it's still valid
  try {
    if ( !$session->validate() ) {
      $session = null;
    }
  } catch ( Exception $e ) {
    // catch any exceptions
    $session = null;
  }
}  
 
if ( !isset( $session ) || $session === null ) {
  // no session exists
  
  try {
    $session = $helper->getSessionFromRedirect();
  } catch( FacebookRequestException $ex ) {
    // When Facebook returns an error
    // handle this better in production code
    print_r( $ex );
  } catch( Exception $ex ) {
    // When validation fails or other local issues
    // handle this better in production code
    print_r( $ex );
  }
  
}
 
// see if we have a session
if ( isset( $session ) ) {
  
  // save the session
  $_SESSION['fb_token'] = $session->getToken();
  // create a session using saved token or the new one we generated at login
  $session = new FacebookSession( $session->getToken() );
  
  // graph api request for user data
  $request = new FacebookRequest( $session, 'GET', '/me' );
  $response = $request->execute();
  // get response
  $graphObject = $response->getGraphObject()->asArray();
  
  // print profile data
  echo '
' . print_r( $graphObject,1) . '</pre>';
  
  // print logout url using session and redirect_uri (logout.php page should destroy the session)
  echo '[url='' . $helper->getLogoutUrl( $session, 'http://x.com/testFB/playground_admin/logout.php' ) . '']Logout[/url]';
  
} else {
  // show login url - ask for permissions email + user_friends
  echo '[url='' . $helper->getLoginUrl( array('email', 'user_friends') ) . '']Login[/url]';
}

create a logout.php as the following :

<?php
	session_start(); //to ensure you are using same session

	//LOGOUT
	session_destroy(); //destroy the session
	header("location: login.php"); //to redirect back to login
?>

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