<?php
/*
 * Laconica - a distributed open-source microblogging tool
 * Copyright (C) 2008, Controlez-Vous, Inc.
 *
 * 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/>.
 */

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

require_once(INSTALLDIR.'/lib/omb.php');

class XrdsAction extends Action
{

    function isReadOnly()
    {                
        return true;
    }

    function handle($args)
    {
        parent::handle($args);
        $nickname = $this->trimmed('nickname');
        $user = User::staticGet('nickname', $nickname);
        if (!$user) {
            $this->clientError(_('No such user.'));
            return;
        }
        $this->show_xrds($user);
    }

    function show_xrds($user)
    {

        header('Content-Type: application/xrds+xml');

        common_start_xml();
        $this->elementStart('XRDS', array('xmlns' => 'xri://$xrds'));

        $this->elementStart('XRD', array('xmlns' => 'xri://$xrd*($v*2.0)',
                                          'xml:id' => 'oauth',
                                          'xmlns:simple' => 'http://xrds-simple.net/core/1.0',
                                          'version' => '2.0'));

        $this->element('Type', null, 'xri://$xrds*simple');

        $this->show_service(OAUTH_ENDPOINT_REQUEST,
                            common_local_url('requesttoken'),
                            array(OAUTH_AUTH_HEADER, OAUTH_POST_BODY),
                            array(OAUTH_HMAC_SHA1),
                            $user->uri);

        $this->show_service(OAUTH_ENDPOINT_AUTHORIZE,
                            common_local_url('userauthorization'),
                            array(OAUTH_AUTH_HEADER, OAUTH_POST_BODY),
                            array(OAUTH_HMAC_SHA1));

        $this->show_service(OAUTH_ENDPOINT_ACCESS,
                            common_local_url('accesstoken'),
                            array(OAUTH_AUTH_HEADER, OAUTH_POST_BODY),
                            array(OAUTH_HMAC_SHA1));

        $this->show_service(OAUTH_ENDPOINT_RESOURCE,
                            null,
                            array(OAUTH_AUTH_HEADER, OAUTH_POST_BODY),
                            array(OAUTH_HMAC_SHA1));

        $this->elementEnd('XRD');

        # XXX: decide whether to include user's ID/nickname in postNotice URL

        $this->elementStart('XRD', array('xmlns' => 'xri://$xrd*($v*2.0)',
                                          'xml:id' => 'omb',
                                          'xmlns:simple' => 'http://xrds-simple.net/core/1.0',
                                          'version' => '2.0'));

        $this->element('Type', null, 'xri://$xrds*simple');

        $this->show_service(OMB_ENDPOINT_POSTNOTICE,
                            common_local_url('postnotice'));

        $this->show_service(OMB_ENDPOINT_UPDATEPROFILE,
                            common_local_url('updateprofile'));

        $this->elementEnd('XRD');

        $this->elementStart('XRD', array('xmlns' => 'xri://$xrd*($v*2.0)',
                                          'version' => '2.0'));

        $this->element('Type', null, 'xri://$xrds*simple');

        $this->show_service(OAUTH_DISCOVERY,
                            '#oauth');
        $this->show_service(OMB_NAMESPACE,
                            '#omb');

        $this->elementEnd('XRD');

        $this->elementEnd('XRDS');
        common_end_xml();
    }

    function show_service($type, $uri, $params=null, $sigs=null, $localId=null)
    {
        $this->elementStart('Service');
        if ($uri) {
            $this->element('URI', null, $uri);
        }
        $this->element('Type', null, $type);
        if ($params) {
            foreach ($params as $param) {
                $this->element('Type', null, $param);
            }
        }
        if ($sigs) {
            foreach ($sigs as $sig) {
                $this->element('Type', null, $sig);
            }
        }
        if ($localId) {
            $this->element('LocalID', null, $localId);
        }
        $this->elementEnd('Service');
    }
}