<?php//// +---------------------------------------------------------------------------+// | Facebook Platform PHP4 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 |// +---------------------------------------------------------------------------+//include_once 'facebook_conf.php';include_once 'facebookapi_php4_restlib.php';class Facebook { var $api_client; var $api_key; var $secret; var $fb_params; var $user; function Facebook($api_key, $secret) { $this->api_key = $api_key; $this->secret = $secret; $this->api_client = new FacebookRestClient($config['rest_server_addr'], $config['api_key'], $config['secret']); $this->validate_fb_params(); } function validate_fb_params() { $this->fb_params = $this->get_valid_fb_params($_POST, 48*3600, 'fb_sig'); if (!$this->fb_params) { $this->fb_params = $this->get_valid_fb_params($_GET, 48*3600, 'fb_sig'); } if ($this->fb_params) { // If we got any fb_params passed in at all, then either: // - they included an fb_user / fb_session_key, which we should assume to be correct // - they didn't include an fb_user / fb_session_key, which means the user doesn't have a // valid session and if we want to get one we'll need to use require_login(). (Calling // set_user with null values for user/session_key will work properly.) // Note that we should *not* use our cookies in this scenario, since they may be referring to // the wrong user. $user = isset($this->fb_params['user']) ? $this->fb_params['user'] : null; $session_key = isset($this->fb_params['session_key']) ? $this->fb_params['session_key'] : null; $expires = isset($this->fb_params['expires']) ? $this->fb_params['expires'] : null; $this->set_user($user, $session_key, $expires); } else if (!empty($_COOKIE) && $cookies = $this->get_valid_fb_params($_COOKIE, null, $this->api_key)) { // use $api_key . '_' as a prefix for the cookies in case there are // multiple facebook clients on the same domain. $this->set_user($cookies['user'], $cookies['session_key']); } else if (isset($_GET['auth_token']) && $session = $this->do_get_session($_GET['auth_token'])) { $this->set_user($session['uid'], $session['session_key'], $session['expires']); } return !empty($this->fb_params); } function do_get_session($auth_token) { return $this->api_client->auth_getSession($auth_token); } function redirect($url) { if ($this->in_fb_canvas()) { echo '<fb:redirect url="' . $url . '"/>'; } else if (preg_match('/^https?:\/\/([^\/]*\.)?facebook\.com(:\d+)?/i', $url)) { // make sure facebook.com url's load in the full frame so that we don't // get a frame within a frame. echo "<script type=\"text/javascript\">\ntop.location.href = \"$url\";\n</script>"; } else { header('Location: ' . $url); } exit; } function in_frame() { return isset($this->fb_params['in_canvas']) || isset($this->fb_params['in_iframe']); } function in_fb_canvas() { return isset($this->fb_params['in_canvas']); } function get_loggedin_user() { return $this->user; } function current_url() { $url = $_SERVER['REQUEST_URI']; if ($_SERVER['QUERY_STRING']) { $url .= '?' . $_SERVER['QUERY_STRING']; } return $url; } function require_login() { if ($user = $this->get_loggedin_user()) { return $user; } $this->redirect($this->get_login_url($this->current_url(), $this->in_frame())); } function require_install() { // this was renamed, keeping for compatibility's sake return $this->require_add(); } function require_add() { if ($user = $this->get_loggedin_user()) { if ($this->api_client->users_isAppAdded()) { return $user; } } $this->redirect($this->get_add_url($this->current_url())); } function require_frame() { if (!$this->in_frame()) { $this->redirect($this->get_login_url($this->current_url(), true)); } } function get_facebook_url($subdomain='www') { // (note the ".f8" has been added for the beta and should be removed at launch) return 'http://' . $subdomain . '.facebook.com'; } function get_install_url($next=null) { // this was renamed, keeping for compatibility's sake return $this->get_add_url($next); } function get_add_url($next=null) { return $this->get_facebook_url().'/add.php?api_key='.$this->api_key . ($next ? '&next=' . urlencode($next) : ''); } function get_login_url($next, $canvas) { return $this->get_facebook_url().'/login.php?v=1.0&api_key='.$this->api_key. ($next ? '&next=' . urlencode($next) : '') . ($canvas ? '&canvas' : ''); } function generate_sig($params_array, $secret) { $str = ''; ksort($params_array); // Note: make sure that the signature parameter is not already included in // $params_array. foreach ($params_array as $k=>$v) { $str .= "$k=$v"; } $str .= $secret; return md5($str); } function set_user($user, $session_key, $expires=null) { if (!$this->in_fb_canvas() && (!isset($_COOKIE[$this->api_key . '_user']) || $_COOKIE[$this->api_key . '_user'] != $user)) { $cookies = array(); $cookies['user'] = $user; $cookies['session_key'] = $session_key; $sig = $this->generate_sig($cookies, $this->secret); foreach ($cookies as $name => $val) { setcookie($this->api_key . '_' . $name, $val, (int)$expires); $_COOKIE[$this->api_key . '_' . $name] = $val; } setcookie($this->api_key, $sig, (int)$expires); $_COOKIE[$this->api_key] = $sig; } $this->user = $user; $this->api_client->session_key = $session_key; } /** * Tries to undo the badness of magic quotes as best we can * @param string $val Should come directly from $_GET, $_POST, etc. * @return string val without added slashes */ function no_magic_quotes($val) { if (get_magic_quotes_gpc()) { return stripslashes($val); } else { return $val; } } function get_valid_fb_params($params, $timeout=null, $namespace='fb_sig') { $prefix = $namespace . '_'; $prefix_len = strlen($prefix); $fb_params = array(); foreach ($params as $name => $val) { if (strpos($name, $prefix) === 0) { $fb_params[substr($name, $prefix_len)] = $this->no_magic_quotes($val); } } if ($timeout && (!isset($fb_params['time']) || time() - $fb_params['time'] > $timeout)) { return array(); } if (!isset($params[$namespace]) || !$this->verify_signature($fb_params, $params[$namespace])) { return array(); } return $fb_params; } function verify_signature($fb_params, $expected_sig) { return $this->generate_sig($fb_params, $this->secret) == $expected_sig; }}?>