105 lines
4.5 KiB
PHP
105 lines
4.5 KiB
PHP
<?php
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// Copyright 2004-2009 Facebook. All Rights Reserved.
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//
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// +---------------------------------------------------------------------------+
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// | Facebook Platform PHP5 client |
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// +---------------------------------------------------------------------------+
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// | Copyright (c) 2007 Facebook, Inc. |
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// | All rights reserved. |
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// | |
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// | Redistribution and use in source and binary forms, with or without |
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// | modification, are permitted provided that the following conditions |
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// | are met: |
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// | |
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// | 1. Redistributions of source code must retain the above copyright |
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// | notice, this list of conditions and the following disclaimer. |
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// | 2. Redistributions in binary form must reproduce the above copyright |
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// | notice, this list of conditions and the following disclaimer in the |
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// | documentation and/or other materials provided with the distribution. |
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// | |
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// | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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// | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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// | OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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// | IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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// | NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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// | THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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// +---------------------------------------------------------------------------+
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// | For help with this library, contact developers-help@facebook.com |
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// +---------------------------------------------------------------------------+
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//
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/**
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* This class extends and modifies the "Facebook" class to better
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* suit desktop apps.
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*/
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class FacebookDesktop extends Facebook {
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// the application secret, which differs from the session secret
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public $app_secret;
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public $verify_sig;
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public function __construct($api_key, $secret) {
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$this->app_secret = $secret;
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$this->verify_sig = false;
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parent::__construct($api_key, $secret);
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}
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public function do_get_session($auth_token) {
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$this->api_client->secret = $this->app_secret;
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$this->api_client->session_key = null;
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$session_info = parent::do_get_session($auth_token);
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if (!empty($session_info['secret'])) {
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// store the session secret
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$this->set_session_secret($session_info['secret']);
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}
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return $session_info;
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}
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public function set_session_secret($session_secret) {
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$this->secret = $session_secret;
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$this->api_client->secret = $session_secret;
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}
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public function require_login() {
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if ($this->get_loggedin_user()) {
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try {
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// try a session-based API call to ensure that we have the correct
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// session secret
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$user = $this->api_client->users_getLoggedInUser();
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// now that we have a valid session secret, verify the signature
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$this->verify_sig = true;
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if ($this->validate_fb_params(false)) {
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return $user;
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} else {
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// validation failed
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return null;
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}
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} catch (FacebookRestClientException $ex) {
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if (isset($_GET['auth_token'])) {
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// if we have an auth_token, use it to establish a session
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$session_info = $this->do_get_session($_GET['auth_token']);
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if ($session_info) {
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return $session_info['uid'];
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}
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}
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}
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}
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// if we get here, we need to redirect the user to log in
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$this->redirect($this->get_login_url(self::current_url(), $this->in_fb_canvas()));
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}
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public function verify_signature($fb_params, $expected_sig) {
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// we do not want to verify the signature until we have a valid
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// session secret
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if ($this->verify_sig) {
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return parent::verify_signature($fb_params, $expected_sig);
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} else {
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return true;
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}
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}
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}
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