gistfile1.aw

 /**
     * This method give you a Login URL for Facebook Connect
     *
     * @param String callback_URL defaults to MOBILE_WEB_URL
     *
     * @return String return URL for facebook authorization dialog
     */
    public static function facebookConnectURL($callback_URL = MOBILE_WEB_URL) {
        global $apikey;
        if (self::isLoggedIn()) {
            throw new ModelException('You already have a session, silly! You can\'t get any more logged in than this.', 'illegal_action');
        }
        $authentication = array(
            'api_key' => $apikey,
            'sessionid' => null
        );
        $params = array($authentication, array($callback_URL));
        $api_request = array("method"=>'User.authenticateFromFacebook', "params"=>$params, "id"=>0);
        $json = json_encode($api_request);
        return 'https://graph.facebook.com/oauth/authorize?'
            .'client_id='.FACEBOOK_APPID
            .'&redirect_uri='.urlencode(SITE_URL.'/API/API.php?json_rpc='.urlencode($json));
    }


    /**
     * Authenticate from Facebook login callback
     *
     * This method is meant to be called by the Facebook Connect callback URL,
     * and looks for the new request parameters appended by OAuth
     *
     * @param String callback_URL
     *
     * @return Redirects to callback URL with "fb_token" parameter appended containing access token
     */
    public static function authenticateFromFacebook($callback_URL = MOBILE_WEB_URL) {
        global $apikey;
        if (self::isLoggedIn()) {
            throw new ModelException('You already have a session, silly! You can\'t get any more logged in than this.', 'illegal_action');
        }
        if (array_key_exists('code', $_REQUEST)) {
            $authentication = array(
                'api_key' => $apikey,
                'sessionid' => null
            );
            $params = array($authentication, array($callback_URL));
            $api_request = array("method"=>'User.authenticateFromFacebook', "params"=>$params, "id"=>0);
            $json = json_encode($api_request);
            $tokenfetchurl =  'https://graph.facebook.com/oauth/access_token?'
                .'client_id='.FACEBOOK_APPID.'&'
                .'client_secret='.FACEBOOK_SECRET.'&'
                .'redirect_uri='.urlencode(SITE_URL.'/API/API.php?json_rpc='.urlencode($json)).'&'
                .'code='.$_REQUEST['code'];
            $tokendata = file_get_contents($tokenfetchurl);
            if (empty($tokendata)) {
                return false;
            }
            $pts = explode('&', $tokendata);
            $args = array();
            foreach($pts as $pt) {
                $arg = explode('=', $pt);
                $args[$arg[0]] = $arg[1];
            }
            $auth = self::authenticateWithSocialNetwork('Facebook', $args['access_token']);
            if (!empty($auth) && array_key_exists('session', $auth)) {
                $session_id = $auth['session'];
            }
            header('Location: ' . $callback_URL . '?fb_token=' . $args['access_token'] . '&session_id=' . $session_id);
        }
    }