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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* A sample module to show best practices for StatusNet plugins
*
* PHP version 5
*
* 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 StatusNet
* @author James Walker <james@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
class XRD
{
const XML_NS = 'http://www.w3.org/2000/xmlns/';
const XRD_NS = 'http://docs.oasis-open.org/ns/xri/xrd-1.0';
const HOST_META_NS = 'http://host-meta.net/xrd/1.0';
public $expires;
public $subject;
public $host;
public $alias = array();
public $types = array();
public $links = array();
public static function parse($xml)
{
$xrd = new XRD();
$dom = new DOMDocument();
// Don't spew XML warnings to output
$old = error_reporting();
error_reporting($old & ~E_WARNING);
$ok = $dom->loadXML($xml);
error_reporting($old);
if (!$ok) {
throw new Exception("Invalid XML");
}
$xrd_element = $dom->getElementsByTagName('XRD')->item(0);
if (!$xrd_element) {
throw new Exception("Invalid XML, missing XRD root");
}
// Check for host-meta host
$host = $xrd_element->getElementsByTagName('Host')->item(0);
if ($host) {
$xrd->host = $host->nodeValue;
}
// Loop through other elements
foreach ($xrd_element->childNodes as $node) {
if (!($node instanceof DOMElement)) {
continue;
}
switch ($node->tagName) {
case 'Expires':
$xrd->expires = $node->nodeValue;
break;
case 'Subject':
$xrd->subject = $node->nodeValue;
break;
case 'Alias':
$xrd->alias[] = $node->nodeValue;
break;
case 'Link':
$xrd->links[] = $xrd->parseLink($node);
break;
case 'Type':
$xrd->types[] = $xrd->parseType($node);
break;
}
}
return $xrd;
}
public function toXML()
{
$xs = new XMLStringer();
$xs->startXML();
$xs->elementStart('XRD', array('xmlns' => XRD::XRD_NS));
if ($this->host) {
$xs->element('hm:Host', array('xmlns:hm' => XRD::HOST_META_NS), $this->host);
}
if ($this->expires) {
$xs->element('Expires', null, $this->expires);
}
if ($this->subject) {
$xs->element('Subject', null, $this->subject);
}
foreach ($this->alias as $alias) {
$xs->element('Alias', null, $alias);
}
foreach ($this->links as $link) {
$titles = array();
if (isset($link['title'])) {
$titles = $link['title'];
unset($link['title']);
}
$xs->elementStart('Link', $link);
foreach ($titles as $title) {
$xs->element('Title', null, $title);
}
$xs->elementEnd('Link');
}
$xs->elementEnd('XRD');
return $xs->getString();
}
function parseType($element)
{
return array();
}
function parseLink($element)
{
$link = array();
$link['rel'] = $element->getAttribute('rel');
$link['type'] = $element->getAttribute('type');
$link['href'] = $element->getAttribute('href');
$link['template'] = $element->getAttribute('template');
foreach ($element->childNodes as $node) {
if ($node instanceof DOMElement) {
switch($node->tagName) {
case 'Title':
$link['title'][] = $node->nodeValue;
}
}
}
return $link;
}
}
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