forked from GNUsocial/gnu-social
437 lines
14 KiB
PHP
437 lines
14 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* An activity
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*
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* PHP version 5
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*
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* LICENCE: 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 Feed
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @author Zach Copley <zach@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
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* @link http://status.net/
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*/
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if (!defined('STATUSNET')) {
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exit(1);
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}
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/**
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* Utilities for turning DOMish things into Activityish things
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*
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* Some common functions that I didn't have the bandwidth to try to factor
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* into some kind of reasonable superclass, so just dumped here. Might
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* be useful to have an ActivityObject parent class or something.
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*
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* @category OStatus
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
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* @link http://status.net/
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*/
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class ActivityUtils
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{
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const ATOM = 'http://www.w3.org/2005/Atom';
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const LINK = 'link';
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const REL = 'rel';
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const TYPE = 'type';
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const HREF = 'href';
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const CONTENT = 'content';
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const SRC = 'src';
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/**
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* Get the permalink for an Activity object
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*
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* @param DOMElement $element A DOM element
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*
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* @return string related link, if any
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*/
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static function getPermalink($element)
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{
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return self::getLink($element, 'alternate', 'text/html');
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}
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/**
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* Get the permalink for an Activity object
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*
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* @param DOMElement $element A DOM element
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*
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* @return string related link, if any
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*/
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static function getLink(DOMNode $element, $rel, $type=null)
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{
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$els = $element->childNodes;
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foreach ($els as $link) {
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if (!($link instanceof DOMElement)) {
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continue;
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}
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if ($link->localName == self::LINK && $link->namespaceURI == self::ATOM) {
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$linkRel = $link->getAttribute(self::REL);
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$linkType = $link->getAttribute(self::TYPE);
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if ($linkRel == $rel &&
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(is_null($type) || $linkType == $type)) {
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return $link->getAttribute(self::HREF);
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}
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}
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}
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return null;
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}
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static function getLinks(DOMNode $element, $rel, $type=null)
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{
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$els = $element->childNodes;
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$out = array();
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for ($i = 0; $i < $els->length; $i++) {
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$link = $els->item($i);
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if ($link->localName == self::LINK && $link->namespaceURI == self::ATOM) {
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$linkRel = $link->getAttribute(self::REL);
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$linkType = $link->getAttribute(self::TYPE);
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if ($linkRel == $rel &&
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(is_null($type) || $linkType == $type)) {
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$out[] = $link;
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}
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}
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}
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return $out;
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}
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/**
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* Gets the first child element with the given tag
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*
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* @param DOMElement $element element to pick at
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* @param string $tag tag to look for
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* @param string $namespace Namespace to look under
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*
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* @return DOMElement found element or null
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*/
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static function child(DOMNode $element, $tag, $namespace=self::ATOM)
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{
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$els = $element->childNodes;
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if (empty($els) || $els->length == 0) {
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return null;
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} else {
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for ($i = 0; $i < $els->length; $i++) {
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$el = $els->item($i);
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if ($el->localName == $tag && $el->namespaceURI == $namespace) {
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return $el;
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}
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}
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}
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}
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/**
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* Gets all immediate child elements with the given tag
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*
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* @param DOMElement $element element to pick at
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* @param string $tag tag to look for
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* @param string $namespace Namespace to look under
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*
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* @return array found element or null
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*/
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static function children(DOMNode $element, $tag, $namespace=self::ATOM)
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{
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$results = array();
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$els = $element->childNodes;
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if (!empty($els) && $els->length > 0) {
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for ($i = 0; $i < $els->length; $i++) {
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$el = $els->item($i);
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if ($el->localName == $tag && $el->namespaceURI == $namespace) {
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$results[] = $el;
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}
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}
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}
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return $results;
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}
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/**
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* Grab the text content of a DOM element child of the current element
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*
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* @param DOMElement $element Element whose children we examine
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* @param string $tag Tag to look up
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* @param string $namespace Namespace to use, defaults to Atom
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*
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* @return string content of the child
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*/
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static function childContent(DOMNode $element, $tag, $namespace=self::ATOM)
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{
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$el = self::child($element, $tag, $namespace);
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if (empty($el)) {
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return null;
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} else {
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return $el->textContent;
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}
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}
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static function childHtmlContent(DOMNode $element, $tag, $namespace=self::ATOM)
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{
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$el = self::child($element, $tag, $namespace);
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if (empty($el)) {
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return null;
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} else {
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return self::textConstruct($el);
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}
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}
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/**
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* Get the content of an atom:entry-like object
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*
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* @param DOMElement $element The element to examine.
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*
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* @return string unencoded HTML content of the element, like "This -< is <b>HTML</b>."
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*
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* @todo handle remote content
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* @todo handle embedded XML mime types
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* @todo handle base64-encoded non-XML and non-text mime types
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*/
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static function getContent($element)
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{
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return self::childHtmlContent($element, self::CONTENT, self::ATOM);
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}
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static function textConstruct($el)
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{
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$src = $el->getAttribute(self::SRC);
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if (!empty($src)) {
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// TRANS: Client exception thrown when there is no source attribute.
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throw new ClientException(_("Can't handle remote content yet."));
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}
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$type = $el->getAttribute(self::TYPE);
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// slavishly following http://atompub.org/rfc4287.html#rfc.section.4.1.3.3
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if (empty($type) || $type == 'text') {
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// We have plaintext saved as the XML text content.
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// Since we want HTML, we need to escape any special chars.
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return htmlspecialchars($el->textContent);
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} else if ($type == 'html') {
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// We have HTML saved as the XML text content.
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// No additional processing required once we've got it.
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$text = $el->textContent;
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return $text;
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} else if ($type == 'xhtml') {
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// Per spec, the <content type="xhtml"> contains a single
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// HTML <div> with XHTML namespace on it as a child node.
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// We need to pull all of that <div>'s child nodes and
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// serialize them back to an (X)HTML source fragment.
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$divEl = ActivityUtils::child($el, 'div', 'http://www.w3.org/1999/xhtml');
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if (empty($divEl)) {
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return null;
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}
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$doc = $divEl->ownerDocument;
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$text = '';
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$children = $divEl->childNodes;
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for ($i = 0; $i < $children->length; $i++) {
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$child = $children->item($i);
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$text .= $doc->saveXML($child);
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}
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return trim($text);
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} else if (in_array($type, array('text/xml', 'application/xml')) ||
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preg_match('#(+|/)xml$#', $type)) {
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// TRANS: Client exception thrown when there embedded XML content is found that cannot be processed yet.
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throw new ClientException(_("Can't handle embedded XML content yet."));
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} else if (strncasecmp($type, 'text/', 5)) {
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return $el->textContent;
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} else {
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// TRANS: Client exception thrown when base64 encoded content is found that cannot be processed yet.
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throw new ClientException(_("Can't handle embedded Base64 content yet."));
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}
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}
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/**
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* Is this a valid URI for remote profile/notice identification?
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* Does not have to be a resolvable URL.
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* @param string $uri
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* @return boolean
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*/
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static function validateUri($uri)
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{
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// Check mailto: URIs first
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if (preg_match('/^mailto:(.*)$/', $uri, $match)) {
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return Validate::email($match[1], common_config('email', 'check_domain'));
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}
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if (Validate::uri($uri)) {
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return true;
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}
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// Possibly an upstream bug; tag: URIs aren't validated properly
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// unless you explicitly ask for them. All other schemes are accepted
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// for basic URI validation without asking.
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if (Validate::uri($uri, array('allowed_scheme' => array('tag')))) {
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return true;
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}
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return false;
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}
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static function getFeedAuthor($feedEl)
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{
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// Try old and deprecated activity:subject
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$subject = ActivityUtils::child($feedEl, Activity::SUBJECT, Activity::SPEC);
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if (!empty($subject)) {
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return new ActivityObject($subject);
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}
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// Try the feed author
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$author = ActivityUtils::child($feedEl, Activity::AUTHOR, Activity::ATOM);
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if (!empty($author)) {
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return new ActivityObject($author);
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}
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// Sheesh. Not a very nice feed! Let's try fingerpoken in the
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// entries.
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$entries = $feedEl->getElementsByTagNameNS(Activity::ATOM, 'entry');
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if (!empty($entries) && $entries->length > 0) {
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$entry = $entries->item(0);
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// Try the (deprecated) activity:actor
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$actor = ActivityUtils::child($entry, Activity::ACTOR, Activity::SPEC);
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if (!empty($actor)) {
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return new ActivityObject($actor);
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}
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// Try the author
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$author = ActivityUtils::child($entry, Activity::AUTHOR, Activity::ATOM);
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if (!empty($author)) {
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return new ActivityObject($author);
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}
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}
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return null;
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}
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static function compareTypes($type, $objects) // this does verbs too!
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{
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$type = self::resolveUri($type);
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foreach ((array)$objects as $object) {
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if ($type === self::resolveUri($object)) {
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return true;
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}
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}
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return false;
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}
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static function resolveUri($uri, $make_relative=false)
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{
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if (empty($uri)) {
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throw new ServerException('No URI to resolve in ActivityUtils::resolveUri');
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}
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if (!$make_relative && parse_url($uri, PHP_URL_SCHEME) == '') { // relative -> absolute
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$uri = Activity::SCHEMA . $uri;
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} elseif ($make_relative) { // absolute -> relative
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$uri = basename($uri); //preg_replace('/^http:\/\/activitystrea\.ms\/schema\/1\.0\//', '', $uri);
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} // absolute schemas pass through unharmed
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return $uri;
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}
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static function findLocalObject(array $uris, $type=ActivityObject::NOTE) {
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$object = null;
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// TODO: Extend this in plugins etc.
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if (Event::handle('StartFindLocalActivityObject', array($uris, $type, &$object))) {
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switch (self::resolveUri($type)) {
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case ActivityObject::PERSON:
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// GROUP will also be here in due time...
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$object = new Profile();
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break;
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default:
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$object = new Notice();
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}
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}
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foreach (array_unique($uris) as $uri) {
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try {
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// the exception thrown will cancel before reaching $object
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$object = call_user_func(array($object, 'fromUri'), $uri);
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break;
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} catch (Exception $e) {
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common_debug('Could not find local activity object from uri: '.$uri);
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}
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}
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if (!empty($object)) {
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Event::handle('EndFindLocalActivityObject', array($object->getUri(), $type, $object));
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} else {
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throw new ServerException('Could not find any activityobject stored locally with given URI');
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}
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return $object;
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}
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// Check authorship by supplying a Profile as a default and letting plugins
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// set it to something else if the activity's author is actually someone
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// else (like with a group or peopletag feed as handled in OStatus).
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//
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// NOTE: Returned is not necessarily the supplied profile! For example,
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// the "feed author" may be a group, but the "activity author" is a person!
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static function checkAuthorship(Activity $activity, Profile $profile)
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{
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if (Event::handle('CheckActivityAuthorship', array($activity, &$profile))) {
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// if (empty($activity->actor)), then we generated this Activity ourselves and can trust $profile
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$actor_uri = $profile->getUri();
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if (!in_array($actor_uri, array($activity->actor->id, $activity->actor->link))) {
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// A mismatch between our locally stored URI and the supplied author?
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// Probably not more than a blog feed or something (with multiple authors or so)
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// but log it for future inspection.
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common_log(LOG_WARNING, "Got an actor '{$activity->actor->title}' ({$activity->actor->id}) on single-user feed for " . $actor_uri);
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} elseif (empty($activity->actor->id)) {
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// Plain <author> without ActivityStreams actor info.
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// We'll just ignore this info for now and save the update under the feed's identity.
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}
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}
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if (!$profile instanceof Profile) {
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throw new ServerException('Could not get an author Profile for activity');
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}
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return $profile;
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}
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}
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