forked from GNUsocial/gnu-social
760 lines
26 KiB
PHP
760 lines
26 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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* 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 MEDIA = 'http://purl.org/syndication/atommedia';
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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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const RSS = null; // no namespace!
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const PUBDATE = 'pubDate';
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const DESCRIPTION = 'description';
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const GUID = 'guid';
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const SELF = 'self';
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const IMAGE = 'image';
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const URL = 'url';
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const DC = 'http://purl.org/dc/elements/1.1/';
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const CREATOR = 'creator';
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const CONTENTNS = 'http://purl.org/rss/1.0/modules/content/';
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const ENCODED = 'encoded';
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public $actor; // an ActivityObject
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public $verb; // a string (the URL)
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public $objects = array(); // an array of ActivityObjects
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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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public $categories = array(); // list of AtomCategory objects
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public $enclosures = array(); // list of enclosure URL references
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public $attachments = array(); // list of attachments
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public $extra = array(); // extra elements as array(tag, attrs, content)
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public $source; // ActivitySource object representing 'home feed'
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public $selfLink; // <link rel='self' type='application/atom+xml'>
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public $editLink; // <link rel='edit' type='application/atom+xml'>
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public $generator; // ActivityObject representing the generating application
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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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// Insist on a feed's root DOMElement; don't allow a DOMDocument
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if ($feed instanceof DOMDocument) {
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throw new ClientException(
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// TRANS: Client exception thrown when a feed instance is a DOMDocument.
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_('Expecting a root feed element but got a whole XML document.')
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);
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}
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$this->entry = $entry;
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$this->feed = $feed;
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if ($entry->namespaceURI == Activity::ATOM &&
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$entry->localName == 'entry') {
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$this->_fromAtomEntry($entry, $feed);
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} else if ($entry->namespaceURI == Activity::RSS &&
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$entry->localName == 'item') {
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$this->_fromRssItem($entry, $feed);
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} else if ($entry->namespaceURI == Activity::SPEC &&
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$entry->localName == 'object') {
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$this->_fromAtomEntry($entry, $feed);
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} else {
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// Low level exception. No need for i18n.
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throw new Exception("Unknown DOM element: {$entry->namespaceURI} {$entry->localName}");
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}
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}
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function _fromAtomEntry($entry, $feed)
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{
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$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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// get immediate object children
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$objectEls = ActivityUtils::children($entry, self::OBJECT, self::SPEC);
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if (count($objectEls) > 0) {
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foreach ($objectEls as $objectEl) {
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// Special case for embedded activities
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$objectType = ActivityUtils::childContent($objectEl, self::OBJECTTYPE, self::SPEC);
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if (!empty($objectType) && $objectType == ActivityObject::ACTIVITY) {
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$this->objects[] = new Activity($objectEl);
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} else {
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$this->objects[] = new ActivityObject($objectEl);
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}
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}
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} else {
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// XXX: really?
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$this->objects[] = new ActivityObject($entry);
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}
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$actorEl = $this->_child($entry, self::ACTOR);
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if (!empty($actorEl)) {
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// Standalone <activity:actor> elements are a holdover from older
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// versions of ActivityStreams. Newer feeds should have this data
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// integrated straight into <atom:author>.
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$this->actor = new ActivityObject($actorEl);
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// Cliqset has bad actor IDs (just nickname of user). We
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// work around it by getting the author data and using its
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// id instead
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if (!preg_match('/^\w+:/', $this->actor->id)) {
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$authorEl = ActivityUtils::child($entry, 'author');
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if (!empty($authorEl)) {
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$authorObj = new ActivityObject($authorEl);
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$this->actor->id = $authorObj->id;
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}
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}
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} else if ($authorEl = $this->_child($entry, self::AUTHOR, self::ATOM)) {
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// An <atom:author> in the entry overrides any author info on
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// the surrounding feed.
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$this->actor = new ActivityObject($authorEl);
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} else if (!empty($feed) &&
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$subjectEl = $this->_child($feed, self::SUBJECT)) {
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// Feed subject is used for things like groups.
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// Should actually possibly not be interpreted as an actor...?
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$this->actor = new ActivityObject($subjectEl);
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} else if (!empty($feed) && $authorEl = $this->_child($feed, self::AUTHOR,
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self::ATOM)) {
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// If there's no <atom:author> on the entry, it's safe to assume
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// the containing feed's authorship info applies.
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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($entry);
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$catEls = $entry->getElementsByTagNameNS(self::ATOM, 'category');
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if ($catEls) {
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for ($i = 0; $i < $catEls->length; $i++) {
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$catEl = $catEls->item($i);
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$this->categories[] = new AtomCategory($catEl);
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}
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}
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foreach (ActivityUtils::getLinks($entry, 'enclosure') as $link) {
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$this->enclosures[] = $link->getAttribute('href');
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}
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// From APP. Might be useful.
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$this->selfLink = ActivityUtils::getLink($entry, 'self', 'application/atom+xml');
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$this->editLink = ActivityUtils::getLink($entry, 'edit', 'application/atom+xml');
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}
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function _fromRssItem($item, $channel)
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{
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$verbEl = $this->_child($item, 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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$pubDateEl = $this->_child($item, self::PUBDATE, self::RSS);
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if (!empty($pubDateEl)) {
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$this->time = strtotime($pubDateEl->textContent);
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}
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if ($authorEl = $this->_child($item, self::AUTHOR, self::RSS)) {
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$this->actor = ActivityObject::fromRssAuthor($authorEl);
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} else if ($dcCreatorEl = $this->_child($item, self::CREATOR, self::DC)) {
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$this->actor = ActivityObject::fromDcCreator($dcCreatorEl);
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} else if ($posterousEl = $this->_child($item, ActivityObject::AUTHOR, ActivityObject::POSTEROUS)) {
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// Special case for Posterous.com
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$this->actor = ActivityObject::fromPosterousAuthor($posterousEl);
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} else if (!empty($channel)) {
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$this->actor = ActivityObject::fromRssChannel($channel);
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} else {
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// No actor!
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}
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$this->title = ActivityUtils::childContent($item, ActivityObject::TITLE, self::RSS);
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$contentEl = ActivityUtils::child($item, self::ENCODED, self::CONTENTNS);
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if (!empty($contentEl)) {
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// <content:encoded> XML node's text content is HTML; no further processing needed.
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$this->content = $contentEl->textContent;
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} else {
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$descriptionEl = ActivityUtils::child($item, self::DESCRIPTION, self::RSS);
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if (!empty($descriptionEl)) {
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// Per spec, <description> must be plaintext.
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// In practice, often there's HTML... but these days good
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// feeds are using <content:encoded> which is explicitly
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// real HTML.
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// We'll treat this following spec, and do HTML escaping
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// to convert from plaintext to HTML.
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$this->content = htmlspecialchars($descriptionEl->textContent);
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}
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}
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$this->link = ActivityUtils::childContent($item, ActivityUtils::LINK, self::RSS);
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// @fixme enclosures
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// @fixme thumbnails... maybe
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$guidEl = ActivityUtils::child($item, self::GUID, self::RSS);
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if (!empty($guidEl)) {
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$this->id = $guidEl->textContent;
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if ($guidEl->hasAttribute('isPermaLink') && $guidEl->getAttribute('isPermaLink') != 'false') {
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// overwrites <link>
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$this->link = $this->id;
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}
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}
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$this->objects[] = new ActivityObject($item);
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$this->context = new ActivityContext($item);
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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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/**
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* Returns an array based on this activity suitable
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* for encoding as a JSON object
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*
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* @return array $activity
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*/
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function asArray()
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{
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$activity = array();
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// actor
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$activity['actor'] = $this->actor->asArray();
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// content
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$activity['content'] = $this->content;
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// generator
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if (!empty($this->generator)) {
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$activity['generator'] = $this->generator->asArray();
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}
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// icon <-- possibly a mini object representing verb?
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// id
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$activity['id'] = $this->id;
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// object
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if (count($this->objects) == 0) {
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common_log(LOG_ERR, "Can't save " . $this->id);
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} else {
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if (count($this->objects) > 1) {
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common_log(LOG_WARNING, "Ignoring " . (count($this->objects) - 1) . " extra objects in JSON output for activity " . $this->id);
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}
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$object = $this->objects[0];
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if ($object instanceof Activity) {
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// Sharing a post activity is more like sharing the original object
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if ($this->verb == 'share' && $object->verb == 'post') {
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// XXX: Here's one for the obfuscation record books
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$object = $object->objects[0];
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}
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}
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$activity['object'] = $object->asArray();
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if ($object instanceof Activity) {
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$activity['object']['objectType'] = 'activity';
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}
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foreach ($this->attachments as $attachment) {
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if (empty($activity['object']['attachments'])) {
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$activity['object']['attachments'] = array();
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}
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$activity['object']['attachments'][] = $attachment->asArray();
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}
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}
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// Context stuff.
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if (!empty($this->context)) {
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if (!empty($this->context->location)) {
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$loc = $this->context->location;
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$activity['location'] = array(
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'objectType' => 'place',
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'position' => sprintf("%+02.5F%+03.5F/", $loc->lat, $loc->lon),
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'lat' => $loc->lat,
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'lon' => $loc->lon
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);
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$name = $loc->getName();
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if ($name) {
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$activity['location']['displayName'] = $name;
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}
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$url = $loc->getURL();
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if ($url) {
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$activity['location']['url'] = $url;
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}
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}
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$activity['to'] = $this->context->getToArray();
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$ctxarr = $this->context->asArray();
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if (array_key_exists('inReplyTo', $ctxarr)) {
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$activity['object']['inReplyTo'] = $ctxarr['inReplyTo'];
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unset($ctxarr['inReplyTo']);
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}
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if (!array_key_exists('status_net', $activity)) {
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$activity['status_net'] = array();
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}
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foreach ($ctxarr as $key => $value) {
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$activity['status_net'][$key] = $value;
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}
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}
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// published
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$activity['published'] = self::iso8601Date($this->time);
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// provider
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$provider = array(
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'objectType' => 'service',
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'displayName' => common_config('site', 'name'),
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'url' => common_root_url()
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);
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$activity['provider'] = $provider;
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// target
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if (!empty($this->target)) {
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$activity['target'] = $this->target->asArray();
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}
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// title
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$activity['title'] = $this->title;
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// updated <-- Optional. Should we use this to indicate the time we r
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// eceived a remote notice? Probably not.
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// verb
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$activity['verb'] = ActivityVerb::canonical($this->verb);
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// url
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if ($this->link) {
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$activity['url'] = $this->link;
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}
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/* Purely extensions hereafter */
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if ($activity['verb'] == 'post') {
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$tags = array();
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foreach ($this->categories as $cat) {
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if (mb_strlen($cat->term) > 0) {
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// Couldn't figure out which object type to use, so...
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$tags[] = array('objectType' => 'http://activityschema.org/object/hashtag',
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'displayName' => $cat->term);
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}
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}
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if (count($tags) > 0) {
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$activity['object']['tags'] = $tags;
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}
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}
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// XXX: a bit of a hack... Since JSON isn't namespaced we probably
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// shouldn't be using 'statusnet:notice_info', but this will work
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// for the moment.
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foreach ($this->extra as $e) {
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list($objectName, $props, $txt) = $e;
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if (!empty($objectName)) {
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$parts = explode(":", $objectName);
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if (count($parts) == 2 && $parts[0] == "statusnet") {
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if (!array_key_exists('status_net', $activity)) {
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$activity['status_net'] = array();
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}
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$activity['status_net'][$parts[1]] = $props;
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} else {
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$activity[$objectName] = $props;
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}
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}
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}
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return array_filter($activity);
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}
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function asString($namespace=false, $author=true, $source=false)
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{
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$xs = new XMLStringer(true);
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$this->outputTo($xs, $namespace, $author, $source);
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return $xs->getString();
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}
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function outputTo($xs, $namespace=false, $author=true, $source=false, $tag='entry')
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{
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if ($namespace) {
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$attrs = array('xmlns' => 'http://www.w3.org/2005/Atom',
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'xmlns:thr' => 'http://purl.org/syndication/thread/1.0',
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'xmlns:activity' => 'http://activitystrea.ms/spec/1.0/',
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'xmlns:georss' => 'http://www.georss.org/georss',
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'xmlns:ostatus' => 'http://ostatus.org/schema/1.0',
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'xmlns:poco' => 'http://portablecontacts.net/spec/1.0',
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'xmlns:media' => 'http://purl.org/syndication/atommedia',
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'xmlns:statusnet' => 'http://status.net/schema/api/1/');
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} else {
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$attrs = array();
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}
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$xs->elementStart($tag, $attrs);
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if ($tag != 'entry') {
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$xs->element('activity:object-type', null, ActivityObject::ACTIVITY);
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}
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if ($this->verb == ActivityVerb::POST && count($this->objects) == 1 && $tag == 'entry') {
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$obj = $this->objects[0];
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$obj->outputTo($xs, null);
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} else {
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$xs->element('id', null, $this->id);
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if ($this->title) {
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$xs->element('title', null, $this->title);
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} else {
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// Require element
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$xs->element('title', null, "");
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}
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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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}
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$xs->element('activity:verb', null, $this->verb);
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$published = self::iso8601Date($this->time);
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$xs->element('published', null, $published);
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$xs->element('updated', null, $published);
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if ($author) {
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$this->actor->outputTo($xs, 'author');
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}
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if ($this->verb != ActivityVerb::POST || count($this->objects) != 1 || $tag != 'entry') {
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foreach($this->objects as $object) {
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if ($object instanceof Activity) {
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$object->outputTo($xs, false, true, true, 'activity:object');
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} else {
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$object->outputTo($xs, 'activity:object');
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}
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}
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}
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if (!empty($this->context)) {
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if (!empty($this->context->replyToID)) {
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if (!empty($this->context->replyToUrl)) {
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$xs->element('thr:in-reply-to',
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array('ref' => $this->context->replyToID,
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'href' => $this->context->replyToUrl));
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} else {
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$xs->element('thr:in-reply-to',
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array('ref' => $this->context->replyToID));
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}
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}
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if (!empty($this->context->replyToUrl)) {
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$xs->element('link', array('rel' => 'related',
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'href' => $this->context->replyToUrl));
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}
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if (!empty($this->context->conversation)) {
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$xs->element('link', array('rel' => 'ostatus:conversation',
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'href' => $this->context->conversation));
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}
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foreach ($this->context->attention as $attnURI) {
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$xs->element('link', array('rel' => 'ostatus:attention',
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'href' => $attnURI));
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$xs->element('link', array('rel' => 'mentioned',
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'href' => $attnURI));
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}
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// XXX: shoulda used ActivityVerb::SHARE
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if (!empty($this->context->forwardID)) {
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if (!empty($this->context->forwardUrl)) {
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$xs->element('ostatus:forward',
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array('ref' => $this->context->forwardID,
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'href' => $this->context->forwardUrl));
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} else {
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$xs->element('ostatus:forward',
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array('ref' => $this->context->forwardID));
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}
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}
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if (!empty($this->context->location)) {
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$loc = $this->context->location;
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$xs->element('georss:point', null, $loc->lat . ' ' . $loc->lon);
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}
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}
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if ($this->target) {
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$this->target->outputTo($xs, 'activity:target');
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}
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foreach ($this->categories as $cat) {
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$cat->outputTo($xs);
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}
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// can be either URLs or enclosure objects
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foreach ($this->enclosures as $enclosure) {
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if (is_string($enclosure)) {
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$xs->element('link', array('rel' => 'enclosure',
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'href' => $enclosure));
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} else {
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$attributes = array('rel' => 'enclosure',
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'href' => $enclosure->url,
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'type' => $enclosure->mimetype,
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'length' => $enclosure->size);
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if ($enclosure->title) {
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$attributes['title'] = $enclosure->title;
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}
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$xs->element('link', $attributes);
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}
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}
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// Info on the source feed
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if ($source && !empty($this->source)) {
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$xs->elementStart('source');
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$xs->element('id', null, $this->source->id);
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$xs->element('title', null, $this->source->title);
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if (array_key_exists('alternate', $this->source->links)) {
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$xs->element('link', array('rel' => 'alternate',
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'type' => 'text/html',
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'href' => $this->source->links['alternate']));
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}
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if (array_key_exists('self', $this->source->links)) {
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$xs->element('link', array('rel' => 'self',
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'type' => 'application/atom+xml',
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'href' => $this->source->links['self']));
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}
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if (array_key_exists('license', $this->source->links)) {
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$xs->element('link', array('rel' => 'license',
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'href' => $this->source->links['license']));
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}
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if (!empty($this->source->icon)) {
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$xs->element('icon', null, $this->source->icon);
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}
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if (!empty($this->source->updated)) {
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$xs->element('updated', null, $this->source->updated);
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}
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$xs->elementEnd('source');
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}
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if (!empty($this->selfLink)) {
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$xs->element('link', array('rel' => 'self',
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'type' => 'application/atom+xml',
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'href' => $this->selfLink));
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}
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if (!empty($this->editLink)) {
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$xs->element('link', array('rel' => 'edit',
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'type' => 'application/atom+xml',
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'href' => $this->editLink));
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}
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// For throwing in extra elements; used for statusnet:notice_info
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foreach ($this->extra as $el) {
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list($tag, $attrs, $content) = $el;
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$xs->element($tag, $attrs, $content);
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}
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$xs->elementEnd($tag);
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return;
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}
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private function _child($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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/**
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* For consistency, we'll always output UTC rather than local time.
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* Note that clients *should* accept any timezone we give them as long
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* as it's properly formatted.
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*
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* @param int $tm Unix timestamp
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* @return string
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*/
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static function iso8601Date($tm)
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{
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$dateStr = date('d F Y H:i:s', $tm);
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$d = new DateTime($dateStr, new DateTimeZone('UTC'));
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return $d->format('c');
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}
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}
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