Created
February 25, 2012 11:02
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<?php | |
/** | |
* Copyright 2011 Facebook, Inc. | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); you may | |
* not use this file except in compliance with the License. You may obtain | |
* a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | |
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | |
* License for the specific language governing permissions and limitations | |
* under the License. | |
*/ | |
require_once "base_facebook.php"; | |
/** | |
* Extends the BaseFacebook class with the intent of using | |
* PHP sessions to store user ids and access tokens. | |
*/ | |
class Facebook extends BaseFacebook | |
{ | |
/** | |
* Identical to the parent constructor, except that | |
* we start a PHP session to store the user ID and | |
* access token if during the course of execution | |
* we discover them. | |
* | |
* @param Array $config the application configuration. | |
* @see BaseFacebook::__construct in facebook.php | |
*/ | |
public function __construct($config) { | |
if (!session_id()) { | |
session_start(); | |
} | |
parent::__construct($config); | |
} | |
protected static $kSupportedKeys = | |
array('state', 'code', 'access_token', 'user_id'); | |
/** | |
* Provides the implementations of the inherited abstract | |
* methods. The implementation uses PHP sessions to maintain | |
* a store for authorization codes, user ids, CSRF states, and | |
* access tokens. | |
*/ | |
protected function setPersistentData($key, $value) { | |
if (!in_array($key, self::$kSupportedKeys)) { | |
self::errorLog('Unsupported key passed to setPersistentData.'); | |
return; | |
} | |
$session_var_name = $this->constructSessionVariableName($key); | |
$_SESSION[$session_var_name] = $value; | |
} | |
protected function getPersistentData($key, $default = false) { | |
if (!in_array($key, self::$kSupportedKeys)) { | |
self::errorLog('Unsupported key passed to getPersistentData.'); | |
return $default; | |
} | |
$session_var_name = $this->constructSessionVariableName($key); | |
return isset($_SESSION[$session_var_name]) ? | |
$_SESSION[$session_var_name] : $default; | |
} | |
protected function clearPersistentData($key) { | |
if (!in_array($key, self::$kSupportedKeys)) { | |
self::errorLog('Unsupported key passed to clearPersistentData.'); | |
return; | |
} | |
$session_var_name = $this->constructSessionVariableName($key); | |
unset($_SESSION[$session_var_name]); | |
} | |
protected function clearAllPersistentData() { | |
foreach (self::$kSupportedKeys as $key) { | |
$this->clearPersistentData($key); | |
} | |
} | |
protected function constructSessionVariableName($key) { | |
return implode('_', array('fb', | |
$this->getAppId(), | |
$key)); | |
} | |
} |
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