<?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
}
?>
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