| 1 |
<?php |
| 2 |
/** |
| 3 |
* Copyright 2011 Facebook, Inc. |
| 4 |
* |
| 5 |
* Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 6 |
* not use this file except in compliance with the License. You may obtain |
| 7 |
* a copy of the License at |
| 8 |
* |
| 9 |
* http://www.apache.org/licenses/LICENSE-2.0 |
| 10 |
* |
| 11 |
* Unless required by applicable law or agreed to in writing, software |
| 12 |
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 13 |
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 14 |
* License for the specific language governing permissions and limitations |
| 15 |
* under the License. |
| 16 |
*/ |
| 17 |
|
| 18 |
require_once dirname(__FILE__).DIRECTORY_SEPARATOR."base_facebook.php"; |
| 19 |
|
| 20 |
/** |
| 21 |
* Extends the BaseFacebook class with the intent of using |
| 22 |
* PHP sessions to store user ids and access tokens. |
| 23 |
*/ |
| 24 |
class Facebook extends BaseFacebook |
| 25 |
{ |
| 26 |
/** |
| 27 |
* Identical to the parent constructor, except that |
| 28 |
* we start a PHP session to store the user ID and |
| 29 |
* access token if during the course of execution |
| 30 |
* we discover them. |
| 31 |
* |
| 32 |
* @param Array $config the application configuration. |
| 33 |
* @see BaseFacebook::__construct in facebook.php |
| 34 |
*/ |
| 35 |
public function __construct($config) { |
| 36 |
if (!session_id()) { |
| 37 |
session_start(); |
| 38 |
} |
| 39 |
parent::__construct($config); |
| 40 |
} |
| 41 |
|
| 42 |
protected static $kSupportedKeys = |
| 43 |
array('state', 'code', 'access_token', 'user_id'); |
| 44 |
|
| 45 |
/** |
| 46 |
* Provides the implementations of the inherited abstract |
| 47 |
* methods. The implementation uses PHP sessions to maintain |
| 48 |
* a store for authorization codes, user ids, CSRF states, and |
| 49 |
* access tokens. |
| 50 |
*/ |
| 51 |
protected function setPersistentData($key, $value) { |
| 52 |
if (!in_array($key, self::$kSupportedKeys)) { |
| 53 |
self::errorLog('Unsupported key passed to setPersistentData.'); |
| 54 |
return; |
| 55 |
} |
| 56 |
|
| 57 |
$session_var_name = $this->constructSessionVariableName($key); |
| 58 |
$_SESSION[$session_var_name] = $value; |
| 59 |
} |
| 60 |
|
| 61 |
protected function getPersistentData($key, $default = false) { |
| 62 |
if (!in_array($key, self::$kSupportedKeys)) { |
| 63 |
self::errorLog('Unsupported key passed to getPersistentData.'); |
| 64 |
return $default; |
| 65 |
} |
| 66 |
|
| 67 |
$session_var_name = $this->constructSessionVariableName($key); |
| 68 |
return isset($_SESSION[$session_var_name]) ? |
| 69 |
$_SESSION[$session_var_name] : $default; |
| 70 |
} |
| 71 |
|
| 72 |
protected function clearPersistentData($key) { |
| 73 |
if (!in_array($key, self::$kSupportedKeys)) { |
| 74 |
self::errorLog('Unsupported key passed to clearPersistentData.'); |
| 75 |
return; |
| 76 |
} |
| 77 |
|
| 78 |
$session_var_name = $this->constructSessionVariableName($key); |
| 79 |
unset($_SESSION[$session_var_name]); |
| 80 |
} |
| 81 |
|
| 82 |
protected function clearAllPersistentData() { |
| 83 |
foreach (self::$kSupportedKeys as $key) { |
| 84 |
$this->clearPersistentData($key); |
| 85 |
} |
| 86 |
} |
| 87 |
|
| 88 |
protected function constructSessionVariableName($key) { |
| 89 |
return implode('_', array('fb', |
| 90 |
$this->getAppId(), |
| 91 |
$key)); |
| 92 |
} |
| 93 |
} |
| 94 |
|
