715 lines
22 KiB
PHP
715 lines
22 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 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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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 $element A DOM element
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*
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* @return string related link, if any
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*/
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static function getLink($element, $rel, $type=null)
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{
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$links = $element->getElementsByTagnameNS(self::ATOM, self::LINK);
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foreach ($links as $link) {
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$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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return null;
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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 $namespace Namespace to look under
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*
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* @return DOMElement found element or null
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*/
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static function child($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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* 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 $namespace Namespace to use, defaults to Atom
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*
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* @return string content of the child
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*/
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static function childContent($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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/**
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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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$contentEl = ActivityUtils::child($element, self::CONTENT);
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if (!empty($contentEl)) {
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$src = $contentEl->getAttribute(self::SRC);
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if (!empty($src)) {
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throw new ClientException(_("Can't handle remote content yet."));
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}
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$type = $contentEl->getAttribute(self::TYPE);
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// slavishly following http://atompub.org/rfc4287.html#rfc.section.4.1.3.3
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if ($type == 'text') {
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return $contentEl->textContent;
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} else if ($type == 'html') {
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$text = $contentEl->textContent;
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return htmlspecialchars_decode($text, ENT_QUOTES);
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} else if ($type == 'xhtml') {
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$divEl = ActivityUtils::child($contentEl, 'div');
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if (empty($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(array('text/xml', 'application/xml'), $type) ||
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preg_match('#(+|/)xml$#', $type)) {
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throw new ClientException(_("Can't handle embedded XML content yet."));
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} else if (strncasecmp($type, 'text/', 5)) {
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return $contentEl->textContent;
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} else {
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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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}
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/**
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* A noun-ish thing in the activity universe
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*
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* The activity streams spec talks about activity objects, while also having
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* a tag activity:object, which is in fact an activity object. Aaaaaah!
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*
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* This is just a thing in the activity universe. Can be the subject, object,
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* or indirect object (target!) of an activity verb. Rotten name, and I'm
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* propagating it. *sigh*
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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 ActivityObject
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{
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const ARTICLE = 'http://activitystrea.ms/schema/1.0/article';
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const BLOGENTRY = 'http://activitystrea.ms/schema/1.0/blog-entry';
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const NOTE = 'http://activitystrea.ms/schema/1.0/note';
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const STATUS = 'http://activitystrea.ms/schema/1.0/status';
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const FILE = 'http://activitystrea.ms/schema/1.0/file';
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const PHOTO = 'http://activitystrea.ms/schema/1.0/photo';
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const ALBUM = 'http://activitystrea.ms/schema/1.0/photo-album';
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const PLAYLIST = 'http://activitystrea.ms/schema/1.0/playlist';
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const VIDEO = 'http://activitystrea.ms/schema/1.0/video';
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const AUDIO = 'http://activitystrea.ms/schema/1.0/audio';
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const BOOKMARK = 'http://activitystrea.ms/schema/1.0/bookmark';
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const PERSON = 'http://activitystrea.ms/schema/1.0/person';
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const GROUP = 'http://activitystrea.ms/schema/1.0/group';
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const PLACE = 'http://activitystrea.ms/schema/1.0/place';
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const COMMENT = 'http://activitystrea.ms/schema/1.0/comment';
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// ^^^^^^^^^^ tea!
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// Atom elements we snarf
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const TITLE = 'title';
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const SUMMARY = 'summary';
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const ID = 'id';
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const SOURCE = 'source';
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const NAME = 'name';
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const URI = 'uri';
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const EMAIL = 'email';
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public $element;
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public $type;
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public $id;
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public $title;
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public $summary;
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public $content;
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public $link;
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public $source;
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/**
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* Constructor
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*
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* This probably needs to be refactored
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* to generate a local class (ActivityPerson, ActivityFile, ...)
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* based on the object type.
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*
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* @param DOMElement $element DOM thing to turn into an Activity thing
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*/
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function __construct($element = null)
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{
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if (empty($element)) {
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return;
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}
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$this->element = $element;
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if ($element->tagName == 'author') {
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$this->type = self::PERSON; // XXX: is this fair?
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$this->title = $this->_childContent($element, self::NAME);
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$this->id = $this->_childContent($element, self::URI);
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if (empty($this->id)) {
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$email = $this->_childContent($element, self::EMAIL);
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if (!empty($email)) {
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// XXX: acct: ?
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$this->id = 'mailto:'.$email;
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}
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}
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} else {
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$this->type = $this->_childContent($element, Activity::OBJECTTYPE,
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Activity::SPEC);
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if (empty($this->type)) {
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$this->type = ActivityObject::NOTE;
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}
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$this->id = $this->_childContent($element, self::ID);
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$this->title = $this->_childContent($element, self::TITLE);
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$this->summary = $this->_childContent($element, self::SUMMARY);
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$this->source = $this->_getSource($element);
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$this->content = ActivityUtils::getContent($element);
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$this->link = ActivityUtils::getPermalink($element);
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// XXX: grab PoCo stuff
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}
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// Some per-type attributes...
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if ($this->type == self::PERSON || $this->type == self::GROUP) {
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$this->displayName = $this->title;
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// @fixme we may have multiple avatars with different resolutions specified
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$this->avatar = ActivityUtils::getLink($element, 'avatar');
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}
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}
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private function _childContent($element, $tag, $namespace=ActivityUtils::ATOM)
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{
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return ActivityUtils::childContent($element, $tag, $namespace);
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}
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// Try to get a unique id for the source feed
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private function _getSource($element)
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{
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$sourceEl = ActivityUtils::child($element, 'source');
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if (empty($sourceEl)) {
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return null;
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} else {
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$href = ActivityUtils::getLink($sourceEl, 'self');
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if (!empty($href)) {
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return $href;
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} else {
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return ActivityUtils::childContent($sourceEl, 'id');
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}
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}
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}
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static function fromNotice($notice)
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{
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$object = new ActivityObject();
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$object->type = ActivityObject::NOTE;
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$object->id = $notice->uri;
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$object->title = $notice->content;
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$object->content = $notice->rendered;
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$object->link = $notice->bestUrl();
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return $object;
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}
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static function fromProfile($profile)
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{
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$object = new ActivityObject();
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$object->type = ActivityObject::PERSON;
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$object->id = $profile->getUri();
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$object->title = $this->getBestName();
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$object->link = $profile->profileurl;
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return $object;
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}
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function asString($tag='activity:object')
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{
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$xs = new XMLStringer(true);
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$xs->elementStart($tag);
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$xs->element('activity:object-type', null, $this->type);
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$xs->element(self::ID, null, $this->id);
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if (!empty($this->title)) {
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$xs->element(self::TITLE, null, $this->title);
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}
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if (!empty($this->summary)) {
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$xs->element(self::SUMMARY, null, $this->summary);
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}
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if (!empty($this->content)) {
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// XXX: assuming HTML content here
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$xs->element(self::CONTENT, array('type' => 'html'), $this->content);
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}
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if (!empty($this->link)) {
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$xs->element('link', array('rel' => 'alternate', 'type' => 'text/html'),
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$this->content);
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}
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$xs->elementEnd($tag);
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return $xs->getString();
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}
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}
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/**
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* Utility class to hold a bunch of constant defining default verb types
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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 ActivityVerb
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{
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const POST = 'http://activitystrea.ms/schema/1.0/post';
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const SHARE = 'http://activitystrea.ms/schema/1.0/share';
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const SAVE = 'http://activitystrea.ms/schema/1.0/save';
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const FAVORITE = 'http://activitystrea.ms/schema/1.0/favorite';
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const PLAY = 'http://activitystrea.ms/schema/1.0/play';
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const FOLLOW = 'http://activitystrea.ms/schema/1.0/follow';
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const FRIEND = 'http://activitystrea.ms/schema/1.0/make-friend';
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const JOIN = 'http://activitystrea.ms/schema/1.0/join';
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const TAG = 'http://activitystrea.ms/schema/1.0/tag';
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// Custom OStatus verbs for the flipside until they're standardized
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const DELETE = 'http://ostatus.org/schema/1.0/unfollow';
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const UNFAVORITE = 'http://ostatus.org/schema/1.0/unfavorite';
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const UNFOLLOW = 'http://ostatus.org/schema/1.0/unfollow';
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const LEAVE = 'http://ostatus.org/schema/1.0/leave';
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}
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class ActivityContext
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{
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public $replyToID;
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public $replyToUrl;
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public $location;
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public $attention = array();
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public $conversation;
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const THR = 'http://purl.org/syndication/thread/1.0';
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const GEORSS = 'http://www.georss.org/georss';
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const OSTATUS = 'http://ostatus.org/schema/1.0';
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const INREPLYTO = 'in-reply-to';
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const REF = 'ref';
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const HREF = 'href';
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const POINT = 'point';
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const ATTENTION = 'ostatus:attention';
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const CONVERSATION = 'ostatus:conversation';
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function __construct($element)
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{
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$replyToEl = ActivityUtils::child($element, self::INREPLYTO, self::THR);
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if (!empty($replyToEl)) {
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$this->replyToID = $replyToEl->getAttribute(self::REF);
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$this->replyToUrl = $replyToEl->getAttribute(self::HREF);
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}
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$this->location = $this->getLocation($element);
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$this->conversation = ActivityUtils::getLink($element, self::CONVERSATION);
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// Multiple attention links allowed
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$links = $element->getElementsByTagNameNS(ActivityUtils::ATOM, ActivityUtils::LINK);
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for ($i = 0; $i < $links->length; $i++) {
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$link = $links->item($i);
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$linkRel = $link->getAttribute(ActivityUtils::REL);
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if ($linkRel == self::ATTENTION) {
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$this->attention[] = $link->getAttribute(self::HREF);
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}
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}
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}
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/**
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* Parse location given as a GeoRSS-simple point, if provided.
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* http://www.georss.org/simple
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*
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* @param feed item $entry
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* @return mixed Location or false
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*/
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function getLocation($dom)
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{
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$points = $dom->getElementsByTagNameNS(self::GEORSS, self::POINT);
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for ($i = 0; $i < $points->length; $i++) {
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$point = $points->item($i)->textContent;
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$point = str_replace(',', ' ', $point); // per spec "treat commas as whitespace"
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$point = preg_replace('/\s+/', ' ', $point);
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$point = trim($point);
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$coords = explode(' ', $point);
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if (count($coords) == 2) {
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list($lat, $lon) = $coords;
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if (is_numeric($lat) && is_numeric($lon)) {
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common_log(LOG_INFO, "Looking up location for $lat $lon from georss");
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return Location::fromLatLon($lat, $lon);
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}
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}
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common_log(LOG_ERR, "Ignoring bogus georss:point value $point");
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}
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return null;
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}
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}
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/**
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* An activity in the ActivityStrea.ms world
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*
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* An activity is kind of like a sentence: someone did something
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* to something else.
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*
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* 'someone' is the 'actor'; 'did something' is the verb;
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* 'something else' is the object.
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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 Activity
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{
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const SPEC = 'http://activitystrea.ms/spec/1.0/';
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const SCHEMA = 'http://activitystrea.ms/schema/1.0/';
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const VERB = 'verb';
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const OBJECT = 'object';
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const ACTOR = 'actor';
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const SUBJECT = 'subject';
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const OBJECTTYPE = 'object-type';
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const CONTEXT = 'context';
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const TARGET = 'target';
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const ATOM = 'http://www.w3.org/2005/Atom';
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const AUTHOR = 'author';
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const PUBLISHED = 'published';
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const UPDATED = 'updated';
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public $actor; // an ActivityObject
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public $verb; // a string (the URL)
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public $object; // an ActivityObject
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public $target; // an ActivityObject
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public $context; // an ActivityObject
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public $time; // Time of the activity
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public $link; // an ActivityObject
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public $entry; // the source entry
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public $feed; // the source feed
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public $summary; // summary of activity
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public $content; // HTML content of activity
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public $id; // ID of the activity
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public $title; // title of the activity
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/**
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* Turns a regular old Atom <entry> into a magical activity
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*
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* @param DOMElement $entry Atom entry to poke at
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* @param DOMElement $feed Atom feed, for context
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*/
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function __construct($entry = null, $feed = null)
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{
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if (is_null($entry)) {
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return;
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}
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$this->entry = $entry;
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$this->feed = $feed;
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$pubEl = $this->_child($entry, self::PUBLISHED, self::ATOM);
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if (!empty($pubEl)) {
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$this->time = strtotime($pubEl->textContent);
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} else {
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// XXX technically an error; being liberal. Good idea...?
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$updateEl = $this->_child($entry, self::UPDATED, self::ATOM);
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if (!empty($updateEl)) {
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$this->time = strtotime($updateEl->textContent);
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} else {
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$this->time = null;
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}
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}
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$this->link = ActivityUtils::getPermalink($entry);
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$verbEl = $this->_child($entry, self::VERB);
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if (!empty($verbEl)) {
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$this->verb = trim($verbEl->textContent);
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} else {
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$this->verb = ActivityVerb::POST;
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// XXX: do other implied stuff here
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}
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$objectEl = $this->_child($entry, self::OBJECT);
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if (!empty($objectEl)) {
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$this->object = new ActivityObject($objectEl);
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} else {
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$this->object = new ActivityObject($entry);
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}
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$actorEl = $this->_child($entry, self::ACTOR);
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if (!empty($actorEl)) {
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$this->actor = new ActivityObject($actorEl);
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} else if (!empty($feed) &&
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$subjectEl = $this->_child($feed, self::SUBJECT)) {
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$this->actor = new ActivityObject($subjectEl);
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} else if ($authorEl = $this->_child($entry, self::AUTHOR, self::ATOM)) {
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$this->actor = new ActivityObject($authorEl);
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} else if (!empty($feed) && $authorEl = $this->_child($feed, self::AUTHOR,
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self::ATOM)) {
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$this->actor = new ActivityObject($authorEl);
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}
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$contextEl = $this->_child($entry, self::CONTEXT);
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if (!empty($contextEl)) {
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$this->context = new ActivityContext($contextEl);
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} else {
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$this->context = new ActivityContext($entry);
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}
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$targetEl = $this->_child($entry, self::TARGET);
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if (!empty($targetEl)) {
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$this->target = new ActivityObject($targetEl);
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}
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$this->summary = ActivityUtils::childContent($entry, 'summary');
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$this->id = ActivityUtils::childContent($entry, 'id');
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$this->content = ActivityUtils::getContent($entry);
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}
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/**
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* Returns an Atom <entry> based on this activity
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*
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* @return DOMElement Atom entry
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*/
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function toAtomEntry()
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{
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return null;
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}
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function asString($namespace=false)
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{
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$xs = new XMLStringer(true);
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if ($namespace) {
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$attrs = array('xmlns' => 'http://www.w3.org/2005/Atom',
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'xmlns:activity' => 'http://activitystrea.ms/spec/1.0/',
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'xmlns:ostatus' => 'http://ostatus.org/schema/1.0');
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} else {
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$attrs = array();
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}
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$xs->elementStart('entry', $attrs);
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$xs->element('id', null, $this->id);
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$xs->element('title', null, $this->title);
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$xs->element('published', null, common_date_iso8601($this->time));
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$xs->element('content', array('type' => 'html'), $this->content);
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if (!empty($this->summary)) {
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$xs->element('summary', null, $this->summary);
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}
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if (!empty($this->link)) {
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$xs->element('link', array('rel' => 'alternate',
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'type' => 'text/html'),
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$this->link);
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}
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// XXX: add context
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// XXX: add target
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$xs->raw($this->actor->asString());
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$xs->element('activity:verb', null, $this->verb);
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$xs->raw($this->object->asString());
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$xs->elementEnd('entry');
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return $xs->getString();
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}
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private function _child($element, $tag, $namespace=self::SPEC)
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{
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return ActivityUtils::child($element, $tag, $namespace);
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}
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} |