<?php

require_once 'xrds_writer.php';

/**
 * Write OMB-specific XRDS using XMLWriter.
 *
 * This class writes the XRDS file announcing the OMB server. It uses
 * OMB_XMLWriter, which is a subclass of XMLWriter. An instance of
 * OMB_Plain_XRDS_Writer should be passed to OMB_Service_Provider->writeXRDS.
 *
 * PHP version 5
 *
 * LICENSE: 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/>.
 *
 * @package   OMB
 * @author    Adrian Lang <mail@adrianlang.de>
 * @copyright 2009 Adrian Lang
 * @license   http://www.gnu.org/licenses/agpl.html GNU AGPL 3.0
 **/

class OMB_Plain_XRDS_Writer implements OMB_XRDS_Writer {
  public function writeXRDS($user, $mapper) {
    header('Content-Type: application/xrds+xml');
    $xw = new XMLWriter();
    $xw->openURI('php://output');
    $xw->setIndent(true);

    $xw->startDocument('1.0', 'UTF-8');
    $this->writeFullElement($xw, 'XRDS',  array('xmlns' => 'xri://$xrds'), array(
        array('XRD',  array('xmlns' => 'xri://$xrd*($v*2.0)',
                                          'xml:id' => 'oauth',
                                          'xmlns:simple' => 'http://xrds-simple.net/core/1.0',
                                          'version' => '2.0'), array(
          array('Type', null, 'xri://$xrds*simple'),
          array('Service', null, array(
            array('Type', null, OAUTH_ENDPOINT_REQUEST),
            array('URI', null, $mapper->getURL(OAUTH_ENDPOINT_REQUEST)),
            array('Type', null, OAUTH_AUTH_HEADER),
            array('Type', null, OAUTH_POST_BODY),
            array('Type', null, OAUTH_HMAC_SHA1),
            array('LocalID', null, $user->getIdentifierURI())
          )),
          array('Service', null, array(
            array('Type', null, OAUTH_ENDPOINT_AUTHORIZE),
            array('URI', null, $mapper->getURL(OAUTH_ENDPOINT_AUTHORIZE)),
            array('Type', null, OAUTH_AUTH_HEADER),
            array('Type', null, OAUTH_POST_BODY),
            array('Type', null, OAUTH_HMAC_SHA1)
          )),
          array('Service', null, array(
            array('Type', null, OAUTH_ENDPOINT_ACCESS),
            array('URI', null, $mapper->getURL(OAUTH_ENDPOINT_ACCESS)),
            array('Type', null, OAUTH_AUTH_HEADER),
            array('Type', null, OAUTH_POST_BODY),
            array('Type', null, OAUTH_HMAC_SHA1)
          )),
          array('Service', null, array(
            array('Type', null, OAUTH_ENDPOINT_RESOURCE),
            array('Type', null, OAUTH_AUTH_HEADER),
            array('Type', null, OAUTH_POST_BODY),
            array('Type', null, OAUTH_HMAC_SHA1)
          ))
        )),
        array('XRD',  array('xmlns' => 'xri://$xrd*($v*2.0)',
                                          'xml:id' => 'omb',
                                          'xmlns:simple' => 'http://xrds-simple.net/core/1.0',
                                          'version' => '2.0'), array(
          array('Type', null, 'xri://$xrds*simple'),
          array('Service', null, array(
            array('Type', null, OMB_ENDPOINT_POSTNOTICE),
            array('URI', null, $mapper->getURL(OMB_ENDPOINT_POSTNOTICE))
          )),
          array('Service', null, array(
            array('Type', null, OMB_ENDPOINT_UPDATEPROFILE),
            array('URI', null, $mapper->getURL(OMB_ENDPOINT_UPDATEPROFILE))
          ))
        )),
        array('XRD',  array('xmlns' => 'xri://$xrd*($v*2.0)',
                                          'version' => '2.0'), array(
          array('Type', null, 'xri://$xrds*simple'),
          array('Service', null, array(
            array('Type', null, OAUTH_DISCOVERY),
            array('URI', null, '#oauth')
          )),
          array('Service', null, array(
            array('Type', null, OMB_VERSION),
            array('URI', null, '#omb')
          ))
        ))
      ));
    $xw->endDocument();
    $xw->flush();
  }

  public static function writeFullElement($xw, $tag, $attributes, $content) {
    $xw->startElement($tag);
    if (!is_null($attributes)) {
      foreach ($attributes as $name => $value) {
        $xw->writeAttribute($name, $value);
      }
    }
    if (is_array($content)) {
      foreach ($content as $values) {
        OMB_Plain_XRDS_Writer::writeFullElement($xw, $values[0], $values[1], $values[2]);
      }
    } else {
      $xw->text($content);
    }
    $xw->fullEndElement();
  }
}
?>