<?php
/*
 * login_with_facebook.php
 *
 * @(#) $Id: login_with_facebook.php,v 1.7 2018/08/16 07:09:40 mlemos Exp $
 *
 */

/*
 *  Get the http.php file from http://www.phpclasses.org/httpclient
 */
require('http.php');
require('oauth_client.php');

$client = new oauth_client_class();
$client->debug = false;
$client->debug_http = true;
$client->server = 'Facebook';

// set the reauthenticate access only if you need to force the user to
// authenticate again even after the user has authorized the application
// before.
$client->reauthenticate = false;

$client->redirect_uri = 'https://'.$_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
 */
$client->scope = 'email,publish_actions,user_friends';
if (($success = $client->Initialize())) {
    if (($success = $client->Process())) {
        if (strlen($client->access_token)) {
            $success = $client->CallAPI(
                'https://graph.facebook.com/v2.3/me?fields=id,first_name,gender,last_name,link,locale,name,timezone,updated_time,verified,email',
                'GET',
                array(),
                array('FailOnAccessError'=>true),
                $user
            );
            /*
                            if($success)
                            {
                                // Get Friends that use the same application

                                $success = $client->CallAPI(
                                    'https://graph.facebook.com/v2.3/me/friends',
                                    'GET', array(), array('FailOnAccessError'=>true), $friends);
                            }
            */
            if ($success) {
                // Requires publish_actions permissions and your application needs to be submitted for review
                $values = array(
                    // You can no longer pre-fill the user message
                    'message'=>'',
                    'link'=>'http://www.phpclasses.org/package/7700-PHP-Authorize-and-access-APIs-using-OAuth.html',
                    // The name of the post can be retrieved from the page title
                    //'name' => 'This is the title',
                    // the description of the post can be retrieved from the page meta description
                    'description'=>'This post was submitted using this PHP OAuth API client class.',
                    'picture' => 'http://files.phpclasses.org/files/blog/package/7700/file/PHP%2BOAuth.png'
                );
                $success = $client->CallAPI(
                    'https://graph.facebook.com/v2.3/me/feed',
                    'POST',
                    $values,
                    array('FailOnAccessError'=>true),
                    $post
                );
            }
            /*
                            if($success)
                            {
                                // Post photos in your time line

                                $success = $client->CallAPI(
                                    "https://graph.facebook.com/me/photos",
                                    'POST', array(
                                        'message'=>'This is a test to post photos in Facebook time line using this the PHP OAuth API class: http://www.phpclasses.org/oauth-api',
                                        'source'=>'picture.jpg'
                                    ),
                                    array(
                                        'FailOnAccessError'=>true,
                                        'Files'=>array(
                                            'source'=>array(
                                    )
                                )
                            ), $upload);
                            }
            */
        }
    }
    $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>';
    echo '<pre>', HtmlSpecialChars(print_r($post, 1)), '</pre>';
    ?>
</body>
</html>
<?php
} else {
    ?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>OAuth client error</title>
</head>
<body>
<h1>OAuth client error</h1>
<pre>Error: <?php echo HtmlSpecialChars($client->error); ?></pre>
</body>
</html>
<?php
}

?>