<?php
/**
 * StatusNet, the distributed open-source microblogging tool
 *
 * Settings for OpenID
 *
 * PHP version 5
 *
 * LICENCE: This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @category  Settings
 * @package   StatusNet
 * @author   Craig Andrews <candrews@integralblue.com>
 * @copyright 2008-2009 StatusNet, Inc.
 * @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link      http://status.net/
 */

if (!defined('STATUSNET')) {
    exit(1);
}

require_once INSTALLDIR.'/plugins/OpenID/openid.php';

/**
 * Settings for OpenID
 *
 * Lets users add, edit and delete OpenIDs from their account
 *
 * @category Settings
 * @package  StatusNet
 * @author   Craig Andrews <candrews@integralblue.com>
 * @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
 * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link     http://status.net/
 */
class OpenidserverAction extends Action
{
    var $oserver;

    function prepare($args)
    {
        parent::prepare($args);
        $this->oserver = oid_server();
        return true;
    }

    function handle($args)
    {
        parent::handle($args);
        $request = $this->oserver->decodeRequest();
        if (in_array($request->mode, array('checkid_immediate',
            'checkid_setup'))) {
            if (!$this->scoped instanceof Profile) {
                if($request->immediate){
                    //cannot prompt the user to login in immediate mode, so answer false
                    $response = $this->generateDenyResponse($request);
                }else{
                    // Go log in, and then come back.
                    //
                    // Note: 303 redirect rather than 307 to avoid
                    // prompting user for form resubmission if we
                    // were POSTed here.
                    common_set_returnto($_SERVER['REQUEST_URI']);
                    common_redirect(common_local_url('login'), 303);
                }
            } elseif (in_array($request->identity, $this->scoped->getAliases()) || $request->idSelect()) {
                $user_openid_trustroot = User_openid_trustroot::pkeyGet(
                                                array('user_id'=>$this->scoped->getID(), 'trustroot'=>$request->trust_root));
                if(empty($user_openid_trustroot)){
                    if($request->immediate){
                        //cannot prompt the user to trust this trust root in immediate mode, so answer false
                        $response = $this->generateDenyResponse($request);
                    }else{
                        common_ensure_session();
                        $_SESSION['openid_trust_root'] = $request->trust_root;
                        $allowResponse = $this->generateAllowResponse($request, $this->scoped);
                        $this->oserver->encodeResponse($allowResponse); //sign the response
                        $denyResponse = $this->generateDenyResponse($request);
                        $this->oserver->encodeResponse($denyResponse); //sign the response
                        $_SESSION['openid_allow_url'] = $allowResponse->encodeToUrl();
                        $_SESSION['openid_deny_url'] = $denyResponse->encodeToUrl();

                        // Ask the user to trust this trust root...
                        //
                        // Note: 303 redirect rather than 307 to avoid
                        // prompting user for form resubmission if we
                        // were POSTed here.
                        common_redirect(common_local_url('openidtrust'), 303);
                    }
                } else {
                    //user has previously authorized this trust root
                    $response = $this->generateAllowResponse($request, $this->scoped);
                }
            } elseif ($request->immediate) {
                $response = $this->generateDenyResponse($request);
            } else {
                //invalid
                // TRANS: OpenID plugin client error given trying to add an unauthorised OpenID to a user (403).
                // TRANS: %s is a request identity.
                $this->clientError(sprintf(_m('You are not authorized to use the identity %s.'),$request->identity),$code=403);
            }
        } else {
            $response = $this->oserver->handleRequest($request);
        }

        if($response){
            $response = $this->oserver->encodeResponse($response);
            if ($response->code != AUTH_OPENID_HTTP_OK) {
                header(sprintf("HTTP/1.1 %d ", $response->code),
                       true, $response->code);
            }

            if($response->headers){
                foreach ($response->headers as $k => $v) {
                    header("$k: $v");
                }
            }
            $this->raw($response->body);
        }else{
            // TRANS: OpenID plugin client error given when not getting a response for a given OpenID provider (500).
            $this->clientError(_m('Just an OpenID provider. Nothing to see here, move along...'),$code=500);
        }
    }

    function generateAllowResponse($request, Profile $profile){
        $response = $request->answer(true, null, $profile->getUrl());
        $user = $profile->getUser();

        $sreg_data = array(
            'fullname' => $profile->getFullname(),
            'nickname' => $profile->getNickname(),
            'email' => $user->email,    // FIXME: Should we make the email optional?
            'language' => $user->language,
            'timezone' => $user->timezone);
        $sreg_request = Auth_OpenID_SRegRequest::fromOpenIDRequest($request);
        $sreg_response = Auth_OpenID_SRegResponse::extractResponse(
                              $sreg_request, $sreg_data);
        $sreg_response->toMessage($response->fields);
        return $response;
    }

    function generateDenyResponse($request){
        $response = $request->answer(false);
        return $response;
    }
}
