forked from GNUsocial/gnu-social
252 lines
7.6 KiB
PHP
252 lines
7.6 KiB
PHP
<?php
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/**
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2011, StatusNet, Inc.
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*
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* Client class for AtomPub
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*
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* PHP version 5
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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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* @category Cache
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2011 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET')) {
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// This check helps protect against security problems;
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// your code file can't be executed directly from the web.
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exit(1);
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}
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/**
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* Client class for AtomPub
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*
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* @category General
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2011 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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class AtomPubClient
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{
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public $url;
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private $user, $pass;
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/**
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*
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* @param string $url collection feed URL
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* @param string $user auth username
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* @param string $pass auth password
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*/
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function __construct($url, $user, $pass)
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{
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$this->url = $url;
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$this->user = $user;
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$this->pass = $pass;
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}
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/**
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* Set up an HTTPClient with auth for our resource.
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*
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* @param string $method
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* @return HTTPClient
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*/
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private function httpClient($method='GET')
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{
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$client = new HTTPClient($this->url);
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$client->setMethod($method);
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$client->setAuth($this->user, $this->pass);
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return $client;
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}
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function get()
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{
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$client = $this->httpClient('GET');
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$response = $client->send();
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if ($response->isOk()) {
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return $response->getBody();
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} else {
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throw new Exception("Bogus return code: " . $response->getStatus() . ': ' . $response->getBody());
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}
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}
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/**
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* Create a new resource by POSTing it to the collection.
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* If successful, will return the URL representing the
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* canonical location of the new resource. Neat!
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*
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* @param string $data
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* @param string $type defaults to Atom entry
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* @return string URL to the created resource
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*
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* @throws exceptions on failure
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*/
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function post($data, $type='application/atom+xml;type=entry')
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{
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$client = $this->httpClient('POST');
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$client->setHeader('Content-Type', $type);
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// optional Slug header not used in this case
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$client->setBody($data);
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$response = $client->send();
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if ($response->getStatus() != '201') {
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throw new Exception("Expected HTTP 201 on POST, got " . $response->getStatus() . ': ' . $response->getBody());
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}
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$loc = $response->getHeader('Location');
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$contentLoc = $response->getHeader('Content-Location');
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if (empty($loc)) {
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throw new Exception("AtomPub POST response missing Location header.");
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}
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if (!empty($contentLoc)) {
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if ($loc != $contentLoc) {
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throw new Exception("AtomPub POST response Location and Content-Location headers do not match.");
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}
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// If Content-Location and Location match, that means the response
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// body is safe to interpret as the resource itself.
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if ($type == 'application/atom+xml;type=entry') {
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self::validateAtomEntry($response->getBody());
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}
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}
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return $loc;
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}
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/**
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* Note that StatusNet currently doesn't allow PUT editing on notices.
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*
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* @param string $data
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* @param string $type defaults to Atom entry
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* @return true on success
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*
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* @throws exceptions on failure
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*/
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function put($data, $type='application/atom+xml;type=entry')
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{
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$client = $this->httpClient('PUT');
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$client->setHeader('Content-Type', $type);
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$client->setBody($data);
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$response = $client->send();
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if ($response->getStatus() != '200' && $response->getStatus() != '204') {
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throw new Exception("Expected HTTP 200 or 204 on PUT, got " . $response->getStatus() . ': ' . $response->getBody());
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}
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return true;
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}
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/**
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* Delete the resource.
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*
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* @return true on success
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*
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* @throws exceptions on failure
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*/
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function delete()
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{
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$client = $this->httpClient('DELETE');
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$client->setBody($data);
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$response = $client->send();
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if ($response->getStatus() != '200' && $response->getStatus() != '204') {
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throw new Exception("Expected HTTP 200 or 204 on DELETE, got " . $response->getStatus() . ': ' . $response->getBody());
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}
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return true;
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}
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/**
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* Ensure that the given string is a parseable Atom entry.
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*
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* @param string $str
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* @return boolean
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* @throws Exception on invalid input
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*/
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static function validateAtomEntry($str)
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{
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if (empty($str)) {
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throw new Exception('Bad Atom entry: empty');
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}
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$dom = new DOMDocument;
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if (!$dom->loadXML($str)) {
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throw new Exception('Bad Atom entry: XML is not well formed.');
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}
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$activity = new Activity($dom->documentRoot);
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return true;
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}
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static function entryEditURL($str) {
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$dom = new DOMDocument;
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$dom->loadXML($str);
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$path = new DOMXPath($dom);
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$path->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
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$links = $path->query('/atom:entry/atom:link[@rel="edit"]', $dom->documentRoot);
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if ($links && $links->length) {
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if ($links->length > 1) {
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throw new Exception('Bad Atom entry; has multiple rel=edit links.');
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}
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$link = $links->item(0);
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$url = $link->getAttribute('href');
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return $url;
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} else {
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throw new Exception('Atom entry lists no rel=edit link.');
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}
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}
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static function entryId($str) {
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$dom = new DOMDocument;
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$dom->loadXML($str);
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$path = new DOMXPath($dom);
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$path->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
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$links = $path->query('/atom:entry/atom:id', $dom->documentRoot);
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if ($links && $links->length) {
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if ($links->length > 1) {
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throw new Exception('Bad Atom entry; has multiple id entries.');
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}
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$link = $links->item(0);
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$url = $link->textContent;
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return $url;
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} else {
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throw new Exception('Atom entry lists no id.');
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}
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}
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static function getEntryInFeed($str, $id)
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{
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$dom = new DOMDocument;
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$dom->loadXML($str);
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$path = new DOMXPath($dom);
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$path->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
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$query = '/atom:feed/atom:entry[atom:id="'.$id.'"]';
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$items = $path->query($query, $dom->documentRoot);
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if ($items && $items->length) {
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return $items->item(0);
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} else {
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return null;
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}
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}
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}
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