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<?php |
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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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|
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include_once 'facebook.php'; |
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|
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/** |
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* This class extends and modifies the "Facebook" class to better |
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* suit desktop apps. |
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*/ |
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class FacebookDesktop extends Facebook { |
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// the application secret, which differs from the session secret |
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public $app_secret; |
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public $verify_sig; |
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|
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public function __construct($api_key, $secret) { |
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$this->app_secret = $secret; |
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$this->verify_sig = false; |
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parent::__construct($api_key, $secret); |
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} |
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|
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public function do_get_session($auth_token) { |
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$this->api_client->secret = $this->app_secret; |
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$session_info = parent::do_get_session($auth_token); |
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if (isset($session_info['secret']) && $session_info['secret']) { |
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// store the session secret |
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$this->set_session_secret($session_info['secret']); |
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} |
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return $session_info; |
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} |
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|
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public function set_session_secret($session_secret) { |
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$this->secret = $session_secret; |
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$this->api_client->secret = $session_secret; |
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} |
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|
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public function require_login() { |
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if ($this->get_loggedin_user()) { |
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try { |
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// try a session-based API call to ensure that we have the correct |
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// session secret |
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$user = $this->api_client->users_getLoggedInUser(); |
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|
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// now that we have a valid session secret, verify the signature |
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$this->verify_sig = true; |
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if ($this->validate_fb_params()) { |
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return $user; |
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} else { |
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// validation failed |
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return null; |
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} |
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} catch (FacebookRestClientException $ex) { |
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if (isset($_GET['auth_token'])) { |
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// if we have an auth_token, use it to establish a session |
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$session_info = $this->do_get_session($_GET['auth_token']); |
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if ($session_info) { |
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return $session_info['uid']; |
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} |
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} |
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} |
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} |
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// if we get here, we need to redirect the user to log in |
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$this->redirect($this->get_login_url(self::current_url(), $this->in_fb_canvas())); |
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} |
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|
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public function verify_signature($fb_params, $expected_sig) { |
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// we don't want to verify the signature until we have a valid |
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// session secret |
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if ($this->verify_sig) { |
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return parent::verify_signature($fb_params, $expected_sig); |
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} else { |
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return true; |
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} |
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} |
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} |
