500 lines
20 KiB
PHP
500 lines
20 KiB
PHP
<?php
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// Copyright 2004-2008 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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include_once 'facebookapi_php5_restlib.php';
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define('FACEBOOK_API_VALIDATION_ERROR', 1);
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class Facebook {
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public $api_client;
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public $api_key;
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public $secret;
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public $generate_session_secret;
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public $session_expires;
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public $fb_params;
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public $user;
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public $profile_user;
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public $canvas_user;
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protected $base_domain;
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/*
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* Create a Facebook client like this:
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*
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* $fb = new Facebook(API_KEY, SECRET);
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*
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* This will automatically pull in any parameters, validate them against the
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* session signature, and chuck them in the public $fb_params member variable.
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*
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* @param api_key your Developer API key
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* @param secret your Developer API secret
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* @param generate_session_secret whether to automatically generate a session
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* if the user doesn't have one, but
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* there is an auth token present in the url,
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*/
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public function __construct($api_key, $secret, $generate_session_secret=false) {
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$this->api_key = $api_key;
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$this->secret = $secret;
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$this->generate_session_secret = $generate_session_secret;
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$this->api_client = new FacebookRestClient($api_key, $secret, null);
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$this->validate_fb_params();
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// Set the default user id for methods that allow the caller to
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// pass an explicit uid instead of using a session key.
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$defaultUser = null;
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if ($this->user) {
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$defaultUser = $this->user;
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} else if ($this->profile_user) {
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$defaultUser = $this->profile_user;
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} else if ($this->canvas_user) {
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$defaultUser = $this->canvas_user;
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}
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$this->api_client->set_user($defaultUser);
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if (isset($this->fb_params['friends'])) {
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$this->api_client->friends_list = explode(',', $this->fb_params['friends']);
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}
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if (isset($this->fb_params['added'])) {
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$this->api_client->added = $this->fb_params['added'];
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}
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if (isset($this->fb_params['canvas_user'])) {
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$this->api_client->canvas_user = $this->fb_params['canvas_user'];
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}
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}
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/*
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* Validates that the parameters passed in were sent from Facebook. It does so
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* by validating that the signature matches one that could only be generated
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* by using your application's secret key.
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*
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* Facebook-provided parameters will come from $_POST, $_GET, or $_COOKIE,
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* in that order. $_POST and $_GET are always more up-to-date than cookies,
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* so we prefer those if they are available.
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*
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* For nitty-gritty details of when each of these is used, check out
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* http://wiki.developers.facebook.com/index.php/Verifying_The_Signature
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*
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* @param bool resolve_auth_token convert an auth token into a session
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*/
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public function validate_fb_params($resolve_auth_token=true) {
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$this->fb_params = $this->get_valid_fb_params($_POST, 48*3600, 'fb_sig');
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// note that with preload FQL, it's possible to receive POST params in
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// addition to GET, so use a different prefix to differentiate them
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if (!$this->fb_params) {
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$fb_params = $this->get_valid_fb_params($_GET, 48*3600, 'fb_sig');
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$fb_post_params = $this->get_valid_fb_params($_POST, 48*3600, 'fb_post_sig');
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$this->fb_params = array_merge($fb_params, $fb_post_params);
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}
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// Okay, something came in via POST or GET
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if ($this->fb_params) {
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$user = isset($this->fb_params['user']) ?
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$this->fb_params['user'] : null;
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$this->profile_user = isset($this->fb_params['profile_user']) ?
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$this->fb_params['profile_user'] : null;
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$this->canvas_user = isset($this->fb_params['canvas_user']) ?
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$this->fb_params['canvas_user'] : null;
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$this->base_domain = isset($this->fb_params['base_domain']) ?
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$this->fb_params['base_domain'] : null;
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if (isset($this->fb_params['session_key'])) {
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$session_key = $this->fb_params['session_key'];
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} else if (isset($this->fb_params['profile_session_key'])) {
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$session_key = $this->fb_params['profile_session_key'];
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} else {
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$session_key = null;
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}
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$expires = isset($this->fb_params['expires']) ?
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$this->fb_params['expires'] : null;
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$this->set_user($user,
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$session_key,
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$expires);
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}
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// if no Facebook parameters were found in the GET or POST variables,
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// then fall back to cookies, which may have cached user information
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// Cookies are also used to receive session data via the Javascript API
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else if ($cookies =
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$this->get_valid_fb_params($_COOKIE, null, $this->api_key)) {
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$base_domain_cookie = 'base_domain_' . $this->api_key;
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if (isset($_COOKIE[$base_domain_cookie])) {
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$this->base_domain = $_COOKIE[$base_domain_cookie];
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}
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// use $api_key . '_' as a prefix for the cookies in case there are
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// multiple facebook clients on the same domain.
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$expires = isset($cookies['expires']) ? $cookies['expires'] : null;
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$this->set_user($cookies['user'],
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$cookies['session_key'],
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$expires);
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}
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// finally, if we received no parameters, but the 'auth_token' GET var
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// is present, then we are in the middle of auth handshake,
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// so go ahead and create the session
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else if ($resolve_auth_token && isset($_GET['auth_token']) &&
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$session = $this->do_get_session($_GET['auth_token'])) {
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if ($this->generate_session_secret &&
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!empty($session['secret'])) {
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$session_secret = $session['secret'];
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}
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if (isset($session['base_domain'])) {
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$this->base_domain = $session['base_domain'];
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}
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$this->set_user($session['uid'],
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$session['session_key'],
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$session['expires'],
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isset($session_secret) ? $session_secret : null);
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}
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return !empty($this->fb_params);
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}
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// Store a temporary session secret for the current session
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// for use with the JS client library
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public function promote_session() {
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try {
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$session_secret = $this->api_client->auth_promoteSession();
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if (!$this->in_fb_canvas()) {
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$this->set_cookies($this->user, $this->api_client->session_key, $this->session_expires, $session_secret);
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}
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return $session_secret;
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} catch (FacebookRestClientException $e) {
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// API_EC_PARAM means we don't have a logged in user, otherwise who
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// knows what it means, so just throw it.
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if ($e->getCode() != FacebookAPIErrorCodes::API_EC_PARAM) {
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throw $e;
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}
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}
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}
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public function do_get_session($auth_token) {
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try {
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return $this->api_client->auth_getSession($auth_token, $this->generate_session_secret);
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} catch (FacebookRestClientException $e) {
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// API_EC_PARAM means we don't have a logged in user, otherwise who
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// knows what it means, so just throw it.
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if ($e->getCode() != FacebookAPIErrorCodes::API_EC_PARAM) {
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throw $e;
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}
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}
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}
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// Invalidate the session currently being used, and clear any state associated with it
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public function expire_session() {
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if ($this->api_client->auth_expireSession()) {
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if (!$this->in_fb_canvas() && isset($_COOKIE[$this->api_key . '_user'])) {
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$cookies = array('user', 'session_key', 'expires', 'ss');
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foreach ($cookies as $name) {
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setcookie($this->api_key . '_' . $name, false, time() - 3600);
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unset($_COOKIE[$this->api_key . '_' . $name]);
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}
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setcookie($this->api_key, false, time() - 3600);
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unset($_COOKIE[$this->api_key]);
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}
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// now, clear the rest of the stored state
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$this->user = 0;
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$this->api_client->session_key = 0;
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return true;
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} else {
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return false;
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}
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}
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public function redirect($url) {
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if ($this->in_fb_canvas()) {
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echo '<fb:redirect url="' . $url . '"/>';
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} else if (preg_match('/^https?:\/\/([^\/]*\.)?facebook\.com(:\d+)?/i', $url)) {
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// make sure facebook.com url's load in the full frame so that we don't
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// get a frame within a frame.
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echo "<script type=\"text/javascript\">\ntop.location.href = \"$url\";\n</script>";
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} else {
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header('Location: ' . $url);
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}
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exit;
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}
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public function in_frame() {
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return isset($this->fb_params['in_canvas']) || isset($this->fb_params['in_iframe']);
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}
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public function in_fb_canvas() {
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return isset($this->fb_params['in_canvas']);
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}
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public function get_loggedin_user() {
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return $this->user;
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}
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public function get_canvas_user() {
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return $this->canvas_user;
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}
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public function get_profile_user() {
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return $this->profile_user;
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}
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public static function current_url() {
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return 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
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}
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// require_add and require_install have been removed.
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// see http://developer.facebook.com/news.php?blog=1&story=116 for more details
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public function require_login() {
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if ($user = $this->get_loggedin_user()) {
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return $user;
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}
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$this->redirect($this->get_login_url(self::current_url(), $this->in_frame()));
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}
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public function require_frame() {
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if (!$this->in_frame()) {
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$this->redirect($this->get_login_url(self::current_url(), true));
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}
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}
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public static function get_facebook_url($subdomain='www') {
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return 'http://' . $subdomain . '.facebook.com';
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}
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public function get_install_url($next=null) {
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// this was renamed, keeping for compatibility's sake
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return $this->get_add_url($next);
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}
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public function get_add_url($next=null) {
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return self::get_facebook_url().'/add.php?api_key='.$this->api_key .
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($next ? '&next=' . urlencode($next) : '');
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}
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public function get_login_url($next, $canvas) {
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return self::get_facebook_url().'/login.php?v=1.0&api_key=' . $this->api_key .
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($next ? '&next=' . urlencode($next) : '') .
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($canvas ? '&canvas' : '');
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}
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public function set_user($user, $session_key, $expires=null, $session_secret=null) {
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if (!$this->in_fb_canvas() && (!isset($_COOKIE[$this->api_key . '_user'])
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|| $_COOKIE[$this->api_key . '_user'] != $user)) {
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$this->set_cookies($user, $session_key, $expires, $session_secret);
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}
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$this->user = $user;
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$this->api_client->session_key = $session_key;
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$this->session_expires = $expires;
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}
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public function set_cookies($user, $session_key, $expires=null, $session_secret=null) {
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$cookies = array();
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$cookies['user'] = $user;
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$cookies['session_key'] = $session_key;
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if ($expires != null) {
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$cookies['expires'] = $expires;
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}
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if ($session_secret != null) {
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$cookies['ss'] = $session_secret;
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}
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foreach ($cookies as $name => $val) {
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setcookie($this->api_key . '_' . $name, $val, (int)$expires, '', $this->base_domain);
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$_COOKIE[$this->api_key . '_' . $name] = $val;
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}
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$sig = self::generate_sig($cookies, $this->secret);
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setcookie($this->api_key, $sig, (int)$expires, '', $this->base_domain);
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$_COOKIE[$this->api_key] = $sig;
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if ($this->base_domain != null) {
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$base_domain_cookie = 'base_domain_' . $this->api_key;
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setcookie($base_domain_cookie, $this->base_domain, (int)$expires, '', $this->base_domain);
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$_COOKIE[$base_domain_cookie] = $this->base_domain;
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}
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}
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/**
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* Tries to undo the badness of magic quotes as best we can
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* @param string $val Should come directly from $_GET, $_POST, etc.
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* @return string val without added slashes
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*/
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public static function no_magic_quotes($val) {
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if (get_magic_quotes_gpc()) {
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return stripslashes($val);
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} else {
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return $val;
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}
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}
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/*
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* Get the signed parameters that were sent from Facebook. Validates the set
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* of parameters against the included signature.
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*
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* Since Facebook sends data to your callback URL via unsecured means, the
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* signature is the only way to make sure that the data actually came from
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* Facebook. So if an app receives a request at the callback URL, it should
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* always verify the signature that comes with against your own secret key.
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* Otherwise, it's possible for someone to spoof a request by
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* pretending to be someone else, i.e.:
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* www.your-callback-url.com/?fb_user=10101
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*
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* This is done automatically by verify_fb_params.
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*
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* @param assoc $params a full array of external parameters.
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* presumed $_GET, $_POST, or $_COOKIE
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* @param int $timeout number of seconds that the args are good for.
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* Specifically good for forcing cookies to expire.
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* @param string $namespace prefix string for the set of parameters we want
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* to verify. i.e., fb_sig or fb_post_sig
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*
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* @return assoc the subset of parameters containing the given prefix,
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* and also matching the signature associated with them.
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* OR an empty array if the params do not validate
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*/
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public function get_valid_fb_params($params, $timeout=null, $namespace='fb_sig') {
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$prefix = $namespace . '_';
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$prefix_len = strlen($prefix);
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$fb_params = array();
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if (empty($params)) {
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return array();
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}
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foreach ($params as $name => $val) {
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// pull out only those parameters that match the prefix
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// note that the signature itself ($params[$namespace]) is not in the list
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if (strpos($name, $prefix) === 0) {
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$fb_params[substr($name, $prefix_len)] = self::no_magic_quotes($val);
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}
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}
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// validate that the request hasn't expired. this is most likely
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// for params that come from $_COOKIE
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if ($timeout && (!isset($fb_params['time']) || time() - $fb_params['time'] > $timeout)) {
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return array();
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}
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// validate that the params match the signature
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$signature = isset($params[$namespace]) ? $params[$namespace] : null;
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if (!$signature || (!$this->verify_signature($fb_params, $signature))) {
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return array();
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}
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return $fb_params;
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}
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/*
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* Validates that a given set of parameters match their signature.
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* Parameters all match a given input prefix, such as "fb_sig".
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*
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* @param $fb_params an array of all Facebook-sent parameters,
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* not including the signature itself
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* @param $expected_sig the expected result to check against
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*/
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public function verify_signature($fb_params, $expected_sig) {
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return self::generate_sig($fb_params, $this->secret) == $expected_sig;
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}
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/*
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* Generate a signature using the application secret key.
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*
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* The only two entities that know your secret key are you and Facebook,
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* according to the Terms of Service. Since nobody else can generate
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* the signature, you can rely on it to verify that the information
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* came from Facebook.
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*
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* @param $params_array an array of all Facebook-sent parameters,
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* NOT INCLUDING the signature itself
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* @param $secret your app's secret key
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*
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* @return a hash to be checked against the signature provided by Facebook
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*/
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public static function generate_sig($params_array, $secret) {
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$str = '';
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ksort($params_array);
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// Note: make sure that the signature parameter is not already included in
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// $params_array.
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foreach ($params_array as $k=>$v) {
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$str .= "$k=$v";
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}
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$str .= $secret;
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return md5($str);
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}
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public function encode_validationError($summary, $message) {
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return json_encode(
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array('errorCode' => FACEBOOK_API_VALIDATION_ERROR,
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'errorTitle' => $summary,
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'errorMessage' => $message));
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}
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public function encode_multiFeedStory($feed, $next) {
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return json_encode(
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array('method' => 'multiFeedStory',
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'content' =>
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array('next' => $next,
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'feed' => $feed)));
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}
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public function encode_feedStory($feed, $next) {
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return json_encode(
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array('method' => 'feedStory',
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'content' =>
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array('next' => $next,
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'feed' => $feed)));
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}
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public function create_templatizedFeedStory($title_template, $title_data=array(),
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$body_template='', $body_data = array(), $body_general=null,
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$image_1=null, $image_1_link=null,
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$image_2=null, $image_2_link=null,
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$image_3=null, $image_3_link=null,
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$image_4=null, $image_4_link=null) {
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return array('title_template'=> $title_template,
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'title_data' => $title_data,
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'body_template'=> $body_template,
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'body_data' => $body_data,
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'body_general' => $body_general,
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'image_1' => $image_1,
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'image_1_link' => $image_1_link,
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'image_2' => $image_2,
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'image_2_link' => $image_2_link,
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'image_3' => $image_3,
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'image_3_link' => $image_3_link,
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'image_4' => $image_4,
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'image_4_link' => $image_4_link);
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}
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}
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