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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();
$dom = new DOMDocument();
if (!$dom->loadXML($xml)) {
throw new Exception("Invalid XML");
}
$xrd_element = $dom->getElementsByTagName('XRD')->item(0);
// 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()
{
$dom = new DOMDocument('1.0', 'UTF-8');
$dom->formatOutput = true;
$xrd_dom = $dom->createElementNS(XRD::XRD_NS, 'XRD');
$dom->appendChild($xrd_dom);
if ($this->host) {
$host_dom = $dom->createElement('hm:Host', $this->host);
$xrd_dom->setAttributeNS(XRD::XML_NS, 'xmlns:hm', XRD::HOST_META_NS);
$xrd_dom->appendChild($host_dom);
}
if ($this->expires) {
$expires_dom = $dom->createElement('Expires', $this->expires);
$xrd_dom->appendChild($expires_dom);
}
if ($this->subject) {
$subject_dom = $dom->createElement('Subject', $this->subject);
$xrd_dom->appendChild($subject_dom);
}
foreach ($this->alias as $alias) {
$alias_dom = $dom->createElement('Alias', $alias);
$xrd_dom->appendChild($alias_dom);
}
foreach ($this->types as $type) {
$type_dom = $dom->createElement('Type', $type);
$xrd_dom->appendChild($type_dom);
}
foreach ($this->links as $link) {
$link_dom = $this->saveLink($dom, $link);
$xrd_dom->appendChild($link_dom);
}
return $dom->saveXML();
}
function parseType($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 $node) {
switch($node->tagName) {
case 'Title':
$link['title'][] = $node->nodeValue;
}
}
return $link;
}
function saveLink($doc, $link)
{
$link_element = $doc->createElement('Link');
if (!empty($link['rel'])) {
$link_element->setAttribute('rel', $link['rel']);
}
if (!empty($link['type'])) {
$link_element->setAttribute('type', $link['type']);
}
if (!empty($link['href'])) {
$link_element->setAttribute('href', $link['href']);
}
if (!empty($link['template'])) {
$link_element->setAttribute('template', $link['template']);
}
if (!empty($link['title']) && is_array($link['title'])) {
foreach($link['title'] as $title) {
$title = $doc->createElement('Title', $title);
$link_element->appendChild($title);
}
}
return $link_element;
}
}
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