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2011-07-12T19:33:56.447
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<p>i'm not yet sure but i think i have the answer to the process of authorizing / authenticating a facebook app...</p> <p>step 1 : the first time a user access your app facebook sends you a signed request and you need to parse it validate it and check if the <code>$data['user_id']</code> is set.</p> <p>the code:</p> <pre><code> $data = $canvas->parse_signed_request($signed_request); $auth_url = 'http://www.facebook.com/dialog/oauth?client_id=' . $app_id . '&redirect_uri=' . urlencode($canvas_page); if(empty($data['user_id'])) { echo '<script>top.location.href="' . $auth_url . '"</script>'; } </code></pre> <p>so if the <code>$data['user_id']</code> is empty go authenticate.</p> <p>step 2: the user authorizes your app facebook sends you a signed request and a code</p> <pre><code> if(isset($_REQUEST['code'])) { $access_token = $canvas->get_access_token($_REQUEST['code']); $user = $canvas->getUser($access_token); $user_info = array( 'user_id' => $user->id, 'user_username' => $user->username, 'user_name' => $user->name ); // install the application for the new user. $user_obj = new User($user_info); // registered or allready exists. if($user_obj) { echo '<script>top.location.href="' . $canvas->canvas_page . '";</script>'; } exit(); } </code></pre> <p>so from what i understood facebook sends you <code>$_REQUEST['code']</code> just one time: when the user approves your canvas application.</p> <p>that's it the user is installed so now every time a user re enters your application you will get a signed_request but this time because the user already approves the application the signed request will include an user_id and oauth_token with it u can get stuff from the graph api.</p> <p>IF THE SIGNED_REQUEST HAVE A USER_ID THIS IS WHAT U DO.</p> <pre><code> if(isset($data['user_id'])) { $user = false; if(!$user) { $user = $canvas->getUser($data['oauth_token']); } if(!ob_start('ob_gzhandler')) ob_start(); $styles = array( 'reset.css', 'jplayer.fbcanvas.css', 'fbcanvas.css' ); $scripts = array( 'http://connect.facebook.net/en_US/all.js#xfbml=1', 'http://ajax.googleapis.com/ajax/libs/jquery/1.6/jquery.min.js', '/sources/js/jplayer/jquery.transform.js', '/sources/js/jplayer/jquery.grab.js', '/sources/js/jplayer/jquery.jplayer.js', '/sources/js/jplayer/mod.csstransforms.min.js', '/sources/js/jplayer/circle.player.js', '/sources/js/fbcanvas.js' ); $results = $canvas->getLatestSongs(); // the canvas. $page->set_title('Khawa'); $page->set_styles($styles); $page->set_scripts($scripts); $page->start_page(); require($_SERVER['DOCUMENT_ROOT'] . '/fbcanvas/fb.tpl'); $page->end_page(); ob_end_flush(); } </code></pre> <p>again i'm not sure but i think this is the process of authentication for FACEBOOK CANVAS APPS.</p>
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