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File: login_check_with_facebook.php

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  Classes of Manuel Lemos  >  PHP OAuth Library  >  login_check_with_facebook.php  >  Download  
File: login_check_with_facebook.php
Role: Example script
Content type: text/plain
Description: Example of checking if the user has authorized Facebook API access without redirecting to the authorization page
Class: PHP OAuth Library
Authorize and access APIs using OAuth
Author: By
Last change: Fixed the redirect URL to use https by default.
Date: 11 months ago
Size: 2,652 bytes
 

 

Contents

Class file image Download
<?php
/*
 * login_check_with_facebook.php
 *
 * @(#) $Id: login_check_with_facebook.php,v 1.3 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';
   
$client->redirect_uri = 'https://'.$_SERVER['HTTP_HOST'].
       
dirname(strtok($_SERVER['REQUEST_URI'],'?')).'/login_check_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');

   
/* The initial page to redirect is not set;
     */
   
$redirect_url = null;
   
   
/* API permissions
     */
   
$client->scope = 'email';
    if((
$success = $client->Initialize()))
    {
        if((
$success = $client->CheckAccessToken($redirect_url)))
        {
           
/*
             * Is there a valid access token or shall we need to
             * redirect the user to the OAuth server authorization page?
             */
           
if(IsSet($redirect_url))
            {
               
/*
                 * It seems the access token was not yet retrieved
                 * or it was expired and could not be renewed
                 */
           
}
            elseif(
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);
            }
        }
       
$success = $client->Finalize($success);
    }
    if(
$success)
    {
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Facebook OAuth client results</title>
</head>
<body>
<?php
       
/*
         * Check if the redirect URL is set, so the user needs to authorize
         * to obtain the access token
         */
       
if(IsSet($redirect_url))
        {
            echo
'<h1><a href="', HtmlSpecialChars($redirect_url).'">Login with Facebook</a></h1>';
        }
        else
        {
            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
   
}

?>