___________________________________
 Light PHP (>= 5.1.0) wrapper for the OAuth 2.0
 ___________________________________
ORIGINAL AUTHOR
================
Charron Pierrick
 - pierrick@webstart.fr
Berejeb Anis
 - anis.berejeb@gmail.com
UPDATED BY & CONTACT
===============
404
 - why404@gmail.com
LICENSE
=======
This Code is released under the GNU LGPL
Please do not change the header of the file(s).
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License for more details.
How can I use it ?
==================
require('client.php');
const CLIENT_ID = 'your client id';
const CLIENT_SECRET = 'your client secret';
const REDIRECT_URI = 'http://url/of/this.php';
const AUTHORIZATION_ENDPOINT = 'https://graph.facebook.com/oauth/authorize';
const TOKEN_ENDPOINT = 'https://graph.facebook.com/oauth/access_token';
$client = new OAuth2_Client(CLIENT_ID, CLIENT_SECRET);
if (!isset($_GET['code']))
{
 $auth_url = $client->getAuthenticationUrl(AUTHORIZATION_ENDPOINT, REDIRECT_URI);
 header('Location: ' . $auth_url);
 die('Redirect');
}
else
{
 $params = array('code' => $_GET['code'], 'redirect_uri' => REDIRECT_URI);
 $response = $client->getAccessToken(TOKEN_ENDPOINT, 'authorization_code', $params);
 parse_str($response['result'], $info);
 $client->setAccessToken($info['access_token']);
 $response = $client->fetch('https://graph.facebook.com/me');
 var_dump($response, $response['result']);
}
How can I add a new Grant Type ?
================================
You can place the class file under GrantType dir.
Here is an example :
require_once('../Exception.php');
require_once('IGrantType.php');
/**
 * MyCustomGrantType Grant Type
 */
class MyCustomGrantType implements OAuth2_GrantType_IGrantType
{
 /**
 * Defines the Grant Type
 *
 * @var string Defaults to 'my_custom_grant_type'.
 */
 const GRANT_TYPE = 'my_custom_grant_type';
 /**
 * Adds a specific Handling of the parameters
 *
 * @return array of Specific parameters to be sent.
 * @param mixed $parameters the parameters array (passed by reference)
 */
 public function validateParameters(&$parameters)
 {
 if (!isset($parameters['first_mandatory_parameter']))
 {
 throw new OAuth2_Exception('The \'first_mandatory_parameter\' parameter must be defined for the Password grant type');
 }
 elseif (!isset($parameters['second_mandatory_parameter']))
 {
 throw new OAuth2_Exception('The \'seconde_mandatory_parameter\' parameter must be defined for the Password grant type');
 }
 }
}
call the OAuth client getAccessToken with the grantType you defined in the GRANT_TYPE constant, As following :
$response = $client->getAccessToken(TOKEN_ENDPOINT, 'my_custom_grant_type', $params);