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+<?php
+// Copyright 2004-2008 Facebook. All Rights Reserved.
+//
+// +---------------------------------------------------------------------------+
+// | Facebook Platform PHP5 client |
+// +---------------------------------------------------------------------------+
+// | Copyright (c) 2007 Facebook, Inc. |
+// | All rights reserved. |
+// | |
+// | Redistribution and use in source and binary forms, with or without |
+// | modification, are permitted provided that the following conditions |
+// | are met: |
+// | |
+// | 1. Redistributions of source code must retain the above copyright |
+// | notice, this list of conditions and the following disclaimer. |
+// | 2. Redistributions in binary form must reproduce the above copyright |
+// | notice, this list of conditions and the following disclaimer in the |
+// | documentation and/or other materials provided with the distribution. |
+// | |
+// | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
+// | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
+// | OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
+// | IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
+// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
+// | NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
+// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
+// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
+// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
+// | THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+// +---------------------------------------------------------------------------+
+// | For help with this library, contact developers-help@facebook.com |
+// +---------------------------------------------------------------------------+
+//
+
+/**
+ * This class extends and modifies the "Facebook" class to better
+ * suit desktop apps.
+ */
+class FacebookDesktop extends Facebook {
+ // the application secret, which differs from the session secret
+ public $app_secret;
+ public $verify_sig;
+
+ public function __construct($api_key, $secret) {
+ $this->app_secret = $secret;
+ $this->verify_sig = false;
+ parent::__construct($api_key, $secret);
+ }
+
+ public function do_get_session($auth_token) {
+ $this->api_client->secret = $this->app_secret;
+ $this->api_client->session_key = null;
+ $session_info = parent::do_get_session($auth_token);
+ if (!empty($session_info['secret'])) {
+ // store the session secret
+ $this->set_session_secret($session_info['secret']);
+ }
+ return $session_info;
+ }
+
+ public function set_session_secret($session_secret) {
+ $this->secret = $session_secret;
+ $this->api_client->secret = $session_secret;
+ }
+
+ public function require_login() {
+ if ($this->get_loggedin_user()) {
+ try {
+ // try a session-based API call to ensure that we have the correct
+ // session secret
+ $user = $this->api_client->users_getLoggedInUser();
+
+ // now that we have a valid session secret, verify the signature
+ $this->verify_sig = true;
+ if ($this->validate_fb_params(false)) {
+ return $user;
+ } else {
+ // validation failed
+ return null;
+ }
+ } catch (FacebookRestClientException $ex) {
+ if (isset($_GET['auth_token'])) {
+ // if we have an auth_token, use it to establish a session
+ $session_info = $this->do_get_session($_GET['auth_token']);
+ if ($session_info) {
+ return $session_info['uid'];
+ }
+ }
+ }
+ }
+ // if we get here, we need to redirect the user to log in
+ $this->redirect($this->get_login_url(self::current_url(), $this->in_fb_canvas()));
+ }
+
+ public function verify_signature($fb_params, $expected_sig) {
+ // we don't want to verify the signature until we have a valid
+ // session secret
+ if ($this->verify_sig) {
+ return parent::verify_signature($fb_params, $expected_sig);
+ } else {
+ return true;
+ }
+ }
+}