forked from GNUsocial/gnu-social
147 lines
4.6 KiB
PHP
147 lines
4.6 KiB
PHP
<?php
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/*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, StatusNet, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @package WebFingerPlugin
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* @author James Walker <james@status.net>
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* @author Mikael Nordfeldth <mmn@hethane.se>
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*/
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if (!defined('GNUSOCIAL')) { exit(1); }
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abstract class XrdAction extends ManagedAction
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{
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// json or xml for now, this may still be overriden because of
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// our back-compatibility with StatusNet <=1.1.1
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protected $defaultformat = null;
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protected $xrd = null;
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public function isReadOnly($args)
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{
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return true;
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}
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/*
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* Configures $this->xrd which will later be printed. Must be
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* implemented by child classes.
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*/
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abstract protected function setXRD();
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protected function prepare(array $args=array())
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{
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if (!isset($args['format'])) {
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$args['format'] = $this->defaultformat;
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}
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parent::prepare($args);
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$this->xrd = new XML_XRD();
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return true;
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}
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protected function handle()
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{
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$this->setXRD();
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if (common_config('discovery', 'cors')) {
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header('Access-Control-Allow-Origin: *');
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}
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parent::handle();
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}
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public function mimeType()
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{
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try {
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return $this->checkAccept();
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} catch (Exception $e) {
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$supported = Discovery::supportedMimeTypes();
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$docformat = $this->arg('format');
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if (!empty($docformat) && isset($supported[$docformat])) {
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return $supported[$docformat];
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}
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}
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/*
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* "A WebFinger resource MUST return a JRD as the representation
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* for the resource if the client requests no other supported
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* format explicitly via the HTTP "Accept" header. [...]
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* The WebFinger resource MUST silently ignore any requested
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* representations that it does not understand and support."
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* -- RFC 7033 (WebFinger)
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* http://tools.ietf.org/html/rfc7033
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*/
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return Discovery::JRD_MIMETYPE;
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}
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public function showPage()
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{
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$mimeType = $this->mimeType();
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header("Content-type: {$mimeType}");
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switch ($mimeType) {
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case Discovery::XRD_MIMETYPE:
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print $this->xrd->toXML();
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break;
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case Discovery::JRD_MIMETYPE:
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case Discovery::JRD_MIMETYPE_OLD:
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print $this->xrd->to('json');
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break;
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default:
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throw new Exception(_('No supported MIME type in Accept header.'));
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}
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}
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protected function checkAccept()
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{
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$type = null;
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$httpaccept = isset($_SERVER['HTTP_ACCEPT'])
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? $_SERVER['HTTP_ACCEPT'] : null;
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$useragent = isset($_SERVER['HTTP_USER_AGENT'])
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? $_SERVER['HTTP_USER_AGENT'] : null;
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if ($httpaccept !== null && $httpaccept != '*/*') {
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$can_serve = implode(',', Discovery::supportedMimeTypes());
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$type = common_negotiate_type(common_accept_to_prefs($httpaccept),
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common_accept_to_prefs($can_serve));
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} else {
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/*
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* HACK: for StatusNet to work against us, we must always serve an
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* XRD to at least versions <1.1.1 (at time of writing) since they
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* don't send Accept headers (in their 'Discovery::fetchXrd' calls)
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*/
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$matches = array();
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preg_match('/(StatusNet)\/(\d+\.\d+(\.\d+)?)/', $useragent, $browser);
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if (count($browser)>2 && $browser[1] === 'StatusNet'
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&& version_compare($browser[2], '1.1.1') < 1) {
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return Discovery::XRD_MIMETYPE;
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}
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}
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if (empty($type)) {
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throw new Exception(_('No specified MIME type in Accept header.'));
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}
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return $type;
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}
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}
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