| 1 | <?php
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| 2 | //
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| 3 | // +---------------------------------------------------------------------------+
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| 4 | // | Facebook Platform PHP4 client |
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| 5 | // +---------------------------------------------------------------------------+
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| 6 | // | Copyright (c) 2007 Facebook, Inc. |
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| 7 | // | All rights reserved. |
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| 8 | // | |
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| 9 | // | Redistribution and use in source and binary forms, with or without |
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| 10 | // | modification, are permitted provided that the following conditions |
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| 11 | // | are met: |
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| 12 | // | |
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| 13 | // | 1. Redistributions of source code must retain the above copyright |
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| 14 | // | notice, this list of conditions and the following disclaimer. |
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| 15 | // | 2. Redistributions in binary form must reproduce the above copyright |
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| 16 | // | notice, this list of conditions and the following disclaimer in the |
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| 17 | // | documentation and/or other materials provided with the distribution. |
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| 18 | // | |
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| 19 | // | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 20 | // | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 21 | // | OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 22 | // | IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 23 | // | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 24 | // | NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 25 | // | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 26 | // | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 27 | // | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 28 | // | THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 29 | // +---------------------------------------------------------------------------+
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| 30 | // | For help with this library, contact developers-help@facebook.com |
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| 31 | // +---------------------------------------------------------------------------+
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| 32 | // no changes were made to this file - Kev
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| 33 | if (!class_exists('Facebook')):
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| 34 | include_once 'facebookapi_php4_restlib.php';
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| 35 |
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| 36 | class Facebook {
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| 37 | var $api_client;
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| 38 |
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| 39 | var $api_key;
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| 40 | var $secret;
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| 41 |
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| 42 | var $fb_params;
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| 43 | var $user;
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| 44 |
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| 45 | var $ec;
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| 46 |
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| 47 | function Facebook($api_key, $secret) {
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| 48 | $this->api_key = $api_key;
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| 49 | $this->secret = $secret;
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| 50 |
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| 51 | $this->api_client = new FacebookRestClient($api_key, $secret, $this);
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| 52 | $this->ec = new FacebookAPIErrorCodes();
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| 53 |
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| 54 | $this->validate_fb_params();
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| 55 |
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| 56 | if (isset($this->fb_params['friends'])) {
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| 57 | $this->api_client->friends_list = explode(',', $this->fb_params['friends']);
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| 58 | }
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| 59 | if (isset($this->fb_params['added'])) {
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| 60 | $this->api_client->added = $this->fb_params['added'];
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| 61 | }
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| 62 | }
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| 63 |
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| 64 | function validate_fb_params() {
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| 65 | $this->fb_params = $this->get_valid_fb_params($_POST, 48*3600, 'fb_sig');
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| 66 | if (!$this->fb_params) {
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| 67 | $this->fb_params = $this->get_valid_fb_params($_GET, 48*3600, 'fb_sig');
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| 68 | }
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| 69 | if ($this->fb_params) {
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| 70 | // If we got any fb_params passed in at all, then either:
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| 71 | // - they included an fb_user / fb_session_key, which we should assume to be correct
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| 72 | // - they didn't include an fb_user / fb_session_key, which means the user doesn't have a
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| 73 | // valid session and if we want to get one we'll need to use require_login(). (Calling
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| 74 | // set_user with null values for user/session_key will work properly.)
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| 75 | // Note that we should *not* use our cookies in this scenario, since they may be referring to
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| 76 | // the wrong user.
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| 77 | $user = isset($this->fb_params['user']) ? $this->fb_params['user'] : null;
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| 78 | $session_key = isset($this->fb_params['session_key']) ? $this->fb_params['session_key'] : null;
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| 79 | $expires = isset($this->fb_params['expires']) ? $this->fb_params['expires'] : null;
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| 80 | $this->set_user($user, $session_key, $expires);
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| 81 | } else if (!empty($_COOKIE) && $cookies = $this->get_valid_fb_params($_COOKIE, null, $this->api_key)) {
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| 82 | // use $api_key . '_' as a prefix for the cookies in case there are
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| 83 | // multiple facebook clients on the same domain.
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| 84 | $this->set_user($cookies['user'], $cookies['session_key']);
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| 85 | } else if (isset($_GET['auth_token']) && $session = $this->do_get_session($_GET['auth_token'])) {
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| 86 | $this->set_user($session['uid'], $session['session_key'], $session['expires']);
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| 87 | }
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| 88 |
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| 89 | return !empty($this->fb_params);
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| 90 | }
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| 91 |
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| 92 | function do_get_session($auth_token) {
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| 93 | $res = $this->api_client->auth_getSession($auth_token);
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| 94 | if (is_array($res)) {
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| 95 | return $res;
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| 96 | }
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| 97 | return false;
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| 98 | }
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| 99 |
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| 100 | function redirect($url) {
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| 101 | if ($this->in_fb_canvas()) {
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| 102 | echo '<fb:redirect url="' . $url . '"/>';
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| 103 | } else if (preg_match('/^https?:\/\/([^\/]*\.)?facebook\.com(:\d+)?/i', $url)) {
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| 104 | // make sure facebook.com url's load in the full frame so that we don't
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| 105 | // get a frame within a frame.
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| 106 | echo "<script type=\"text/javascript\">\ntop.location.href = \"$url\";\n</script>";
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| 107 | } else {
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| 108 | header('Location: ' . $url);
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| 109 | }
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| 110 | exit;
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| 111 | }
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| 112 |
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| 113 | function in_frame() {
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| 114 | return isset($this->fb_params['in_canvas']) || isset($this->fb_params['in_iframe']);
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| 115 | }
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| 116 | function in_fb_canvas() {
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| 117 | return isset($this->fb_params['in_canvas']);
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| 118 | }
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| 119 |
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| 120 | function get_loggedin_user() {
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| 121 | return $this->user;
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| 122 | }
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| 123 |
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| 124 | function current_url() {
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| 125 | return 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
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| 126 | }
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| 127 |
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| 128 | function require_login() {
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| 129 | if ($user = $this->get_loggedin_user()) {
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| 130 | return $user;
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| 131 | }
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| 132 | $this->redirect($this->get_login_url($this->current_url(), $this->in_frame()));
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| 133 | }
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| 134 |
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| 135 | function require_install() {
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| 136 | // this was renamed, keeping for compatibility's sake
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| 137 | return $this->require_add();
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| 138 | }
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| 139 |
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| 140 | function require_add() {
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| 141 | if ($user = $this->get_loggedin_user()) {
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| 142 | if ($this->fb_params['added']) {
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| 143 | return $user;
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| 144 | }
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| 145 | }
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| 146 | $this->redirect($this->get_add_url($this->current_url()));
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| 147 | }
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| 148 |
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| 149 | function require_frame() {
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| 150 | if (!$this->in_frame()) {
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| 151 | $this->redirect($this->get_login_url($this->current_url(), true));
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| 152 | }
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| 153 | }
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| 154 |
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| 155 | function get_facebook_url($subdomain='www') {
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| 156 | return 'http://' . $subdomain . '.facebook.com';
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| 157 | }
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| 158 |
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| 159 | function get_install_url($next=null) {
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| 160 | // this was renamed, keeping for compatibility's sake
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| 161 | return $this->get_add_url($next);
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| 162 | }
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| 163 |
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| 164 | function get_add_url($next=null) {
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| 165 | return $this->get_facebook_url().'/add.php?api_key='.$this->api_key .
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| 166 | ($next ? '&next=' . urlencode($next) : '');
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| 167 | }
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| 168 |
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| 169 | function get_login_url($next, $canvas) {
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| 170 | return $this->get_facebook_url().'/login.php?v=1.0&api_key=' . $this->api_key .
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| 171 | ($next ? '&next=' . urlencode($next) : '') .
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| 172 | ($canvas ? '&canvas' : '');
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| 173 | }
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| 174 |
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| 175 | function generate_sig($params_array, $secret) {
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| 176 | $str = '';
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| 177 |
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| 178 | ksort($params_array);
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| 179 | // Note: make sure that the signature parameter is not already included in
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| 180 | // $params_array.
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| 181 | foreach ($params_array as $k=>$v) {
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| 182 | $str .= "$k=$v";
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| 183 | }
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| 184 | $str .= $secret;
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| 185 |
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| 186 | return md5($str);
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| 187 | }
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| 188 |
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| 189 | function set_user($user, $session_key, $expires=null) {
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| 190 | if (!$this->in_fb_canvas() && (!isset($_COOKIE[$this->api_key . '_user'])
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| 191 | || $_COOKIE[$this->api_key . '_user'] != $user)) {
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| 192 | $cookies = array();
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| 193 | $cookies['user'] = $user;
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| 194 | $cookies['session_key'] = $session_key;
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| 195 | $sig = $this->generate_sig($cookies, $this->secret);
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| 196 | foreach ($cookies as $name => $val) {
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| 197 | setcookie($this->api_key . '_' . $name, $val, (int)$expires);
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| 198 | $_COOKIE[$this->api_key . '_' . $name] = $val;
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| 199 | }
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| 200 | setcookie($this->api_key, $sig, (int)$expires);
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| 201 | $_COOKIE[$this->api_key] = $sig;
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| 202 | }
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| 203 | $this->user = $user;
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| 204 | $this->api_client->session_key = $session_key;
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| 205 | }
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| 206 |
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| 207 | /**
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| 208 | * Tries to undo the badness of magic quotes as best we can
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| 209 | * @param string $val Should come directly from $_GET, $_POST, etc.
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| 210 | * @return string val without added slashes
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| 211 | */
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| 212 | function no_magic_quotes($val) {
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| 213 | if (get_magic_quotes_gpc()) {
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| 214 | return stripslashes($val);
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| 215 | } else {
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| 216 | return $val;
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| 217 | }
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| 218 | }
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| 219 |
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| 220 | function get_valid_fb_params($params, $timeout=null, $namespace='fb_sig') {
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| 221 | $prefix = $namespace . '_';
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| 222 | $prefix_len = strlen($prefix);
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| 223 | $fb_params = array();
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| 224 | foreach ($params as $name => $val) {
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| 225 | if (strpos($name, $prefix) === 0) {
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| 226 | $fb_params[substr($name, $prefix_len)] = $this->no_magic_quotes($val);
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| 227 | }
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| 228 | }
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| 229 | if ($timeout && (!isset($fb_params['time']) || time() - $fb_params['time'] > $timeout)) {
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| 230 | return array();
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| 231 | }
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| 232 | if (!isset($params[$namespace]) || !$this->verify_signature($fb_params, $params[$namespace])) {
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| 233 | return array();
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| 234 | }
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| 235 | return $fb_params;
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| 236 | }
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| 237 |
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| 238 | function verify_signature($fb_params, $expected_sig) {
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| 239 | return $this->generate_sig($fb_params, $this->secret) == $expected_sig;
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| 240 | }
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| 241 |
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| 242 | function expire_session() {
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| 243 | $this->api_client->auth_expireSession();
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| 244 | if (!$this->in_fb_canvas() && isset($_COOKIE[$this->api_key . '_user'])) {
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| 245 |
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| 246 | $cookies = array('user', 'session_key', 'expires', 'ss');
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| 247 | foreach ($cookies as $name) {
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| 248 | setcookie($this->api_key . '_' . $name, false, time() - 3600,"/");
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| 249 | unset($_COOKIE[$this->api_key . '_' . $name]);
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| 250 | //echo "SET ".$this->api_key . '_' . $name;
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| 251 | }
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| 252 | setcookie($this->api_key, false, time() - 3600,"/");
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| 253 | unset($_COOKIE[$this->api_key]);
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| 254 | }
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| 255 | $this->user = 0;
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| 256 | $this->api_client->session_key = 0;
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| 257 | return true;
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| 258 | }
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| 259 | }
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| 260 | endif;
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| 261 | ?>
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