<?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)); } }