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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 |
+// +---------------------------------------------------------------------------+
+//
+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);
+ }
+
+
+}
+