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Diffstat (limited to 'extlib/facebook/facebook.php')
| -rw-r--r-- | extlib/facebook/facebook.php | 499 |
1 files changed, 499 insertions, 0 deletions
diff --git a/extlib/facebook/facebook.php b/extlib/facebook/facebook.php new file mode 100644 index 000000000..35de6be50 --- /dev/null +++ b/extlib/facebook/facebook.php @@ -0,0 +1,499 @@ +<?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 | +// +---------------------------------------------------------------------------+ +// +include_once 'facebookapi_php5_restlib.php'; + +define('FACEBOOK_API_VALIDATION_ERROR', 1); +class Facebook { + public $api_client; + + public $api_key; + public $secret; + public $generate_session_secret; + public $session_expires; + + public $fb_params; + public $user; + public $profile_user; + public $canvas_user; + protected $base_domain; + /* + * Create a Facebook client like this: + * + * $fb = new Facebook(API_KEY, SECRET); + * + * This will automatically pull in any parameters, validate them against the + * session signature, and chuck them in the public $fb_params member variable. + * + * @param api_key your Developer API key + * @param secret your Developer API secret + * @param generate_session_secret whether to automatically generate a session + * if the user doesn't have one, but + * there is an auth token present in the url, + */ + public function __construct($api_key, $secret, $generate_session_secret=false) { + $this->api_key = $api_key; + $this->secret = $secret; + $this->generate_session_secret = $generate_session_secret; + $this->api_client = new FacebookRestClient($api_key, $secret, null); + $this->validate_fb_params(); + + // Set the default user id for methods that allow the caller to + // pass an explicit uid instead of using a session key. + $defaultUser = null; + if ($this->user) { + $defaultUser = $this->user; + } else if ($this->profile_user) { + $defaultUser = $this->profile_user; + } else if ($this->canvas_user) { + $defaultUser = $this->canvas_user; + } + + $this->api_client->set_user($defaultUser); + + + if (isset($this->fb_params['friends'])) { + $this->api_client->friends_list = explode(',', $this->fb_params['friends']); + } + if (isset($this->fb_params['added'])) { + $this->api_client->added = $this->fb_params['added']; + } + if (isset($this->fb_params['canvas_user'])) { + $this->api_client->canvas_user = $this->fb_params['canvas_user']; + } + } + + /* + * Validates that the parameters passed in were sent from Facebook. It does so + * by validating that the signature matches one that could only be generated + * by using your application's secret key. + * + * Facebook-provided parameters will come from $_POST, $_GET, or $_COOKIE, + * in that order. $_POST and $_GET are always more up-to-date than cookies, + * so we prefer those if they are available. + * + * For nitty-gritty details of when each of these is used, check out + * http://wiki.developers.facebook.com/index.php/Verifying_The_Signature + * + * @param bool resolve_auth_token convert an auth token into a session + */ + public function validate_fb_params($resolve_auth_token=true) { + $this->fb_params = $this->get_valid_fb_params($_POST, 48*3600, 'fb_sig'); + + // note that with preload FQL, it's possible to receive POST params in + // addition to GET, so use a different prefix to differentiate them + if (!$this->fb_params) { + $fb_params = $this->get_valid_fb_params($_GET, 48*3600, 'fb_sig'); + $fb_post_params = $this->get_valid_fb_params($_POST, 48*3600, 'fb_post_sig'); + $this->fb_params = array_merge($fb_params, $fb_post_params); + } + + // Okay, something came in via POST or GET + if ($this->fb_params) { + $user = isset($this->fb_params['user']) ? + $this->fb_params['user'] : null; + $this->profile_user = isset($this->fb_params['profile_user']) ? + $this->fb_params['profile_user'] : null; + $this->canvas_user = isset($this->fb_params['canvas_user']) ? + $this->fb_params['canvas_user'] : null; + $this->base_domain = isset($this->fb_params['base_domain']) ? + $this->fb_params['base_domain'] : null; + + if (isset($this->fb_params['session_key'])) { + $session_key = $this->fb_params['session_key']; + } else if (isset($this->fb_params['profile_session_key'])) { + $session_key = $this->fb_params['profile_session_key']; + } else { + $session_key = null; + } + $expires = isset($this->fb_params['expires']) ? + $this->fb_params['expires'] : null; + $this->set_user($user, + $session_key, + $expires); + } + // if no Facebook parameters were found in the GET or POST variables, + // then fall back to cookies, which may have cached user information + // Cookies are also used to receive session data via the Javascript API + else if ($cookies = + $this->get_valid_fb_params($_COOKIE, null, $this->api_key)) { + + $base_domain_cookie = 'base_domain_' . $this->api_key; + if (isset($_COOKIE[$base_domain_cookie])) { + $this->base_domain = $_COOKIE[$base_domain_cookie]; + } + + // use $api_key . '_' as a prefix for the cookies in case there are + // multiple facebook clients on the same domain. + $expires = isset($cookies['expires']) ? $cookies['expires'] : null; + $this->set_user($cookies['user'], + $cookies['session_key'], + $expires); + } + // finally, if we received no parameters, but the 'auth_token' GET var + // is present, then we are in the middle of auth handshake, + // so go ahead and create the session + else if ($resolve_auth_token && isset($_GET['auth_token']) && + $session = $this->do_get_session($_GET['auth_token'])) { + if ($this->generate_session_secret && + !empty($session['secret'])) { + $session_secret = $session['secret']; + } + + if (isset($session['base_domain'])) { + $this->base_domain = $session['base_domain']; + } + + $this->set_user($session['uid'], + $session['session_key'], + $session['expires'], + isset($session_secret) ? $session_secret : null); + } + + return !empty($this->fb_params); + } + + // Store a temporary session secret for the current session + // for use with the JS client library + public function promote_session() { + try { + $session_secret = $this->api_client->auth_promoteSession(); + if (!$this->in_fb_canvas()) { + $this->set_cookies($this->user, $this->api_client->session_key, $this->session_expires, $session_secret); + } + return $session_secret; + } catch (FacebookRestClientException $e) { + // API_EC_PARAM means we don't have a logged in user, otherwise who + // knows what it means, so just throw it. + if ($e->getCode() != FacebookAPIErrorCodes::API_EC_PARAM) { + throw $e; + } + } + } + + public function do_get_session($auth_token) { + try { + return $this->api_client->auth_getSession($auth_token, $this->generate_session_secret); + } catch (FacebookRestClientException $e) { + // API_EC_PARAM means we don't have a logged in user, otherwise who + // knows what it means, so just throw it. + if ($e->getCode() != FacebookAPIErrorCodes::API_EC_PARAM) { + throw $e; + } + } + } + + // Invalidate the session currently being used, and clear any state associated with it + public function expire_session() { + if ($this->api_client->auth_expireSession()) { + if (!$this->in_fb_canvas() && isset($_COOKIE[$this->api_key . '_user'])) { + $cookies = array('user', 'session_key', 'expires', 'ss'); + foreach ($cookies as $name) { + setcookie($this->api_key . '_' . $name, false, time() - 3600); + unset($_COOKIE[$this->api_key . '_' . $name]); + } + setcookie($this->api_key, false, time() - 3600); + unset($_COOKIE[$this->api_key]); + } + + // now, clear the rest of the stored state + $this->user = 0; + $this->api_client->session_key = 0; + return true; + } else { + return false; + } + } + + public function redirect($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: ' . $url); + } + exit; + } + + public function in_frame() { + return isset($this->fb_params['in_canvas']) || isset($this->fb_params['in_iframe']); + } + public function in_fb_canvas() { + return isset($this->fb_params['in_canvas']); + } + + public function get_loggedin_user() { + return $this->user; + } + + public function get_canvas_user() { + return $this->canvas_user; + } + + public function get_profile_user() { + return $this->profile_user; + } + + public static function current_url() { + return 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; + } + + // require_add and require_install have been removed. + // see http://developer.facebook.com/news.php?blog=1&story=116 for more details + public function require_login() { + if ($user = $this->get_loggedin_user()) { + return $user; + } + $this->redirect($this->get_login_url(self::current_url(), $this->in_frame())); + } + + public function require_frame() { + if (!$this->in_frame()) { + $this->redirect($this->get_login_url(self::current_url(), true)); + } + } + + public static function get_facebook_url($subdomain='www') { + return 'http://' . $subdomain . '.facebook.com'; + } + + public function get_install_url($next=null) { + // this was renamed, keeping for compatibility's sake + return $this->get_add_url($next); + } + + public function get_add_url($next=null) { + return self::get_facebook_url().'/add.php?api_key='.$this->api_key . + ($next ? '&next=' . urlencode($next) : ''); + } + + public function get_login_url($next, $canvas) { + return self::get_facebook_url().'/login.php?v=1.0&api_key=' . $this->api_key . + ($next ? '&next=' . urlencode($next) : '') . + ($canvas ? '&canvas' : ''); + } + + public function set_user($user, $session_key, $expires=null, $session_secret=null) { + if (!$this->in_fb_canvas() && (!isset($_COOKIE[$this->api_key . '_user']) + || $_COOKIE[$this->api_key . '_user'] != $user)) { + $this->set_cookies($user, $session_key, $expires, $session_secret); + } + $this->user = $user; + $this->api_client->session_key = $session_key; + $this->session_expires = $expires; + } + + public function set_cookies($user, $session_key, $expires=null, $session_secret=null) { + $cookies = array(); + $cookies['user'] = $user; + $cookies['session_key'] = $session_key; + if ($expires != null) { + $cookies['expires'] = $expires; + } + if ($session_secret != null) { + $cookies['ss'] = $session_secret; + } + + foreach ($cookies as $name => $val) { + setcookie($this->api_key . '_' . $name, $val, (int)$expires, '', $this->base_domain); + $_COOKIE[$this->api_key . '_' . $name] = $val; + } + $sig = self::generate_sig($cookies, $this->secret); + setcookie($this->api_key, $sig, (int)$expires, '', $this->base_domain); + $_COOKIE[$this->api_key] = $sig; + + if ($this->base_domain != null) { + $base_domain_cookie = 'base_domain_' . $this->api_key; + setcookie($base_domain_cookie, $this->base_domain, (int)$expires, '', $this->base_domain); + $_COOKIE[$base_domain_cookie] = $this->base_domain; + } + } + + /** + * Tries to undo the badness of magic quotes as best we can + * @param string $val Should come directly from $_GET, $_POST, etc. + * @return string val without added slashes + */ + public static function no_magic_quotes($val) { + if (get_magic_quotes_gpc()) { + return stripslashes($val); + } else { + return $val; + } + } + + /* + * Get the signed parameters that were sent from Facebook. Validates the set + * of parameters against the included signature. + * + * Since Facebook sends data to your callback URL via unsecured means, the + * signature is the only way to make sure that the data actually came from + * Facebook. So if an app receives a request at the callback URL, it should + * always verify the signature that comes with against your own secret key. + * Otherwise, it's possible for someone to spoof a request by + * pretending to be someone else, i.e.: + * www.your-callback-url.com/?fb_user=10101 + * + * This is done automatically by verify_fb_params. + * + * @param assoc $params a full array of external parameters. + * presumed $_GET, $_POST, or $_COOKIE + * @param int $timeout number of seconds that the args are good for. + * Specifically good for forcing cookies to expire. + * @param string $namespace prefix string for the set of parameters we want + * to verify. i.e., fb_sig or fb_post_sig + * + * @return assoc the subset of parameters containing the given prefix, + * and also matching the signature associated with them. + * OR an empty array if the params do not validate + */ + public function get_valid_fb_params($params, $timeout=null, $namespace='fb_sig') { + $prefix = $namespace . '_'; + $prefix_len = strlen($prefix); + $fb_params = array(); + if (empty($params)) { + return array(); + } + + foreach ($params as $name => $val) { + // pull out only those parameters that match the prefix + // note that the signature itself ($params[$namespace]) is not in the list + if (strpos($name, $prefix) === 0) { + $fb_params[substr($name, $prefix_len)] = self::no_magic_quotes($val); + } + } + + // validate that the request hasn't expired. this is most likely + // for params that come from $_COOKIE + if ($timeout && (!isset($fb_params['time']) || time() - $fb_params['time'] > $timeout)) { + return array(); + } + + // validate that the params match the signature + $signature = isset($params[$namespace]) ? $params[$namespace] : null; + if (!$signature || (!$this->verify_signature($fb_params, $signature))) { + return array(); + } + return $fb_params; + } + + /* + * Validates that a given set of parameters match their signature. + * Parameters all match a given input prefix, such as "fb_sig". + * + * @param $fb_params an array of all Facebook-sent parameters, + * not including the signature itself + * @param $expected_sig the expected result to check against + */ + public function verify_signature($fb_params, $expected_sig) { + return self::generate_sig($fb_params, $this->secret) == $expected_sig; + } + + /* + * Generate a signature using the application secret key. + * + * The only two entities that know your secret key are you and Facebook, + * according to the Terms of Service. Since nobody else can generate + * the signature, you can rely on it to verify that the information + * came from Facebook. + * + * @param $params_array an array of all Facebook-sent parameters, + * NOT INCLUDING the signature itself + * @param $secret your app's secret key + * + * @return a hash to be checked against the signature provided by Facebook + */ + public static function generate_sig($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); + } + + public function encode_validationError($summary, $message) { + return json_encode( + array('errorCode' => FACEBOOK_API_VALIDATION_ERROR, + 'errorTitle' => $summary, + 'errorMessage' => $message)); + } + + public function encode_multiFeedStory($feed, $next) { + return json_encode( + array('method' => 'multiFeedStory', + 'content' => + array('next' => $next, + 'feed' => $feed))); + } + + public function encode_feedStory($feed, $next) { + return json_encode( + array('method' => 'feedStory', + 'content' => + array('next' => $next, + 'feed' => $feed))); + } + + public function create_templatizedFeedStory($title_template, $title_data=array(), + $body_template='', $body_data = array(), $body_general=null, + $image_1=null, $image_1_link=null, + $image_2=null, $image_2_link=null, + $image_3=null, $image_3_link=null, + $image_4=null, $image_4_link=null) { + return array('title_template'=> $title_template, + 'title_data' => $title_data, + 'body_template'=> $body_template, + 'body_data' => $body_data, + 'body_general' => $body_general, + 'image_1' => $image_1, + 'image_1_link' => $image_1_link, + 'image_2' => $image_2, + 'image_2_link' => $image_2_link, + 'image_3' => $image_3, + 'image_3_link' => $image_3_link, + 'image_4' => $image_4, + 'image_4_link' => $image_4_link); + } + + +} + |