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File: login_with_facebook.php

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  Classes of Manuel Lemos  >  PHP OAuth API  >  login_with_facebook.php  >  Download  
File: login_with_facebook.php
Role: Example script
Content type: text/plain
Description: Example of logging in with Facebook using OAuth
Class: PHP OAuth API
Authorize and access APIs using OAuth
Author: By
Last change: Added checks to verify if the access token was successfully retrieved
before calling an API.
Added an option to make API calls fail if there is an access error.
Date: 2012-10-05 03:26
Size: 1,781 bytes
 

Contents

Class file image Download
<?php
/*
 * login_with_facebook.php
 *
 * @(#) $Id: login_with_facebook.php,v 1.2 2012/10/05 09:22:40 mlemos Exp $
 *
 */

    require('http.php');
    require('oauth_client.php');

    $client = new oauth_client_class;
    $client->server = 'Facebook';
    $client->redirect_uri = 'http://'.$_SERVER['HTTP_HOST'].
        dirname(strtok($_SERVER['REQUEST_URI'],'?')).'/login_with_facebook.php';

    $client->client_id = ''; $application_line = __LINE__;
    $client->client_secret = '';

    if(strlen($client->client_id) == 0
    || strlen($client->client_secret) == 0)
        die('Please go to Facebook Apps page https://developers.facebook.com/apps , '.
            'create an application, and in the line '.$application_line.
            ' set the client_id to App ID/API Key and client_secret with App Secret');

    /* API permissions
     */
    $client->scope = 'email';
    if(($success = $client->Initialize()))
    {
        if(($success = $client->Process()))
        {
            if(strlen($client->access_token))
            {
                $success = $client->CallAPI(
                    'https://graph.facebook.com/me', 
                    'GET', array(), array('FailOnAccessError'=>true), $user);
            }
        }
        $success = $client->Finalize($success);
    }
    if($client->exit)
        exit;
    if($success)
    {
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Facebook OAuth client results</title>
</head>
<body>
<?php
        echo '<h1>', HtmlSpecialChars($user->name), 
            ' you have logged in successfully with Facebook!</h1>';
        echo '<pre>', HtmlSpecialChars(print_r($user, 1)), '</pre>';
?>
</body>
</html>
<?php
    }
    else
    {
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>OAuth client error</title>
</head>
<body>
<h1>OAuth client error</h1>
<pre>Error: <?php echo HtmlSpecialChars($client->error); ?></pre>
</body>
</html>
<?php
    }

?>