gnu-social/plugins/WebFinger/lib/xrdaction.php

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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, 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/>.
*/
/**
* @package WebFingerPlugin
* @author James Walker <james@status.net>
* @author Mikael Nordfeldth <mmn@hethane.se>
*/
if (!defined('GNUSOCIAL')) { exit(1); }
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abstract class XrdAction extends ManagedAction
{
// json or xml for now, this may still be overriden because of
// our back-compatibility with StatusNet <=1.1.1
protected $defaultformat = null;
protected $xrd = null;
public function isReadOnly($args)
{
return true;
}
/*
* Configures $this->xrd which will later be printed. Must be
* implemented by child classes.
*/
abstract protected function setXRD();
protected function prepare(array $args=array())
{
if (!isset($args['format'])) {
$args['format'] = $this->defaultformat;
}
parent::prepare($args);
$this->xrd = new XML_XRD();
return true;
}
protected function handle()
{
$this->setXRD();
if (common_config('discovery', 'cors')) {
header('Access-Control-Allow-Origin: *');
}
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parent::handle();
}
public function mimeType()
{
try {
return $this->checkAccept();
} catch (Exception $e) {
$supported = Discovery::supportedMimeTypes();
$docformat = $this->arg('format');
if (!empty($docformat) && isset($supported[$docformat])) {
return $supported[$docformat];
}
}
/*
* "A WebFinger resource MUST return a JRD as the representation
* for the resource if the client requests no other supported
* format explicitly via the HTTP "Accept" header. [...]
* The WebFinger resource MUST silently ignore any requested
* representations that it does not understand and support."
* -- RFC 7033 (WebFinger)
* http://tools.ietf.org/html/rfc7033
*/
return Discovery::JRD_MIMETYPE;
}
public function showPage()
{
$mimeType = $this->mimeType();
header("Content-type: {$mimeType}");
switch ($mimeType) {
case Discovery::XRD_MIMETYPE:
print $this->xrd->toXML();
break;
case Discovery::JRD_MIMETYPE:
case Discovery::JRD_MIMETYPE_OLD:
print $this->xrd->to('json');
break;
default:
throw new Exception(_('No supported MIME type in Accept header.'));
}
}
protected function checkAccept()
{
$type = null;
$httpaccept = isset($_SERVER['HTTP_ACCEPT'])
? $_SERVER['HTTP_ACCEPT'] : null;
$useragent = isset($_SERVER['HTTP_USER_AGENT'])
? $_SERVER['HTTP_USER_AGENT'] : null;
if ($httpaccept !== null && $httpaccept != '*/*') {
$can_serve = implode(',', Discovery::supportedMimeTypes());
$type = common_negotiate_type(common_accept_to_prefs($httpaccept),
common_accept_to_prefs($can_serve));
} else {
/*
* HACK: for StatusNet to work against us, we must always serve an
* XRD to at least versions <1.1.1 (at time of writing) since they
* don't send Accept headers (in their 'Discovery::fetchXrd' calls)
*/
$matches = array();
preg_match('/(StatusNet)\/(\d+\.\d+(\.\d+)?)/', $useragent, $browser);
if (count($browser)>2 && $browser[1] === 'StatusNet'
&& version_compare($browser[2], '1.1.1') < 1) {
return Discovery::XRD_MIMETYPE;
}
}
if (empty($type)) {
throw new Exception(_('No specified MIME type in Accept header.'));
}
return $type;
}
}