3 * StatusNet, the distributed open-source microblogging tool
9 * LICENCE: This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Affero General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Affero General Public License for more details.
19 * You should have received a copy of the GNU Affero General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * @author Evan Prodromou <evan@status.net>
25 * @copyright 2010 StatusNet, Inc.
26 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
27 * @link http://status.net/
30 if (!defined('STATUSNET')) {
35 * Utilities for turning DOMish things into Activityish things
37 * Some common functions that I didn't have the bandwidth to try to factor
38 * into some kind of reasonable superclass, so just dumped here. Might
39 * be useful to have an ActivityObject parent class or something.
43 * @author Evan Prodromou <evan@status.net>
44 * @copyright 2010 StatusNet, Inc.
45 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
46 * @link http://status.net/
51 const ATOM = 'http://www.w3.org/2005/Atom';
59 * Get the permalink for an Activity object
61 * @param DOMElement $element A DOM element
63 * @return string related link, if any
66 static function getPermalink($element)
68 return self::getLink($element, 'alternate', 'text/html');
72 * Get the permalink for an Activity object
74 * @param DOMElement $element A DOM element
76 * @return string related link, if any
79 static function getLink($element, $rel, $type=null)
81 $links = $element->getElementsByTagnameNS(self::ATOM, self::LINK);
83 foreach ($links as $link) {
85 $linkRel = $link->getAttribute(self::REL);
86 $linkType = $link->getAttribute(self::TYPE);
88 if ($linkRel == $rel &&
89 (is_null($type) || $linkType == $type)) {
90 return $link->getAttribute(self::HREF);
98 * Gets the first child element with the given tag
100 * @param DOMElement $element element to pick at
101 * @param string $tag tag to look for
102 * @param string $namespace Namespace to look under
104 * @return DOMElement found element or null
107 static function child($element, $tag, $namespace=self::ATOM)
109 $els = $element->childNodes;
110 if (empty($els) || $els->length == 0) {
113 for ($i = 0; $i < $els->length; $i++) {
114 $el = $els->item($i);
115 if ($el->localName == $tag && $el->namespaceURI == $namespace) {
123 * Grab the text content of a DOM element child of the current element
125 * @param DOMElement $element Element whose children we examine
126 * @param string $tag Tag to look up
127 * @param string $namespace Namespace to use, defaults to Atom
129 * @return string content of the child
132 static function childContent($element, $tag, $namespace=self::ATOM)
134 $el = self::child($element, $tag, $namespace);
139 return $el->textContent;
145 * A noun-ish thing in the activity universe
147 * The activity streams spec talks about activity objects, while also having
148 * a tag activity:object, which is in fact an activity object. Aaaaaah!
150 * This is just a thing in the activity universe. Can be the subject, object,
151 * or indirect object (target!) of an activity verb. Rotten name, and I'm
152 * propagating it. *sigh*
156 * @author Evan Prodromou <evan@status.net>
157 * @copyright 2010 StatusNet, Inc.
158 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
159 * @link http://status.net/
164 const ARTICLE = 'http://activitystrea.ms/schema/1.0/article';
165 const BLOGENTRY = 'http://activitystrea.ms/schema/1.0/blog-entry';
166 const NOTE = 'http://activitystrea.ms/schema/1.0/note';
167 const STATUS = 'http://activitystrea.ms/schema/1.0/status';
168 const FILE = 'http://activitystrea.ms/schema/1.0/file';
169 const PHOTO = 'http://activitystrea.ms/schema/1.0/photo';
170 const ALBUM = 'http://activitystrea.ms/schema/1.0/photo-album';
171 const PLAYLIST = 'http://activitystrea.ms/schema/1.0/playlist';
172 const VIDEO = 'http://activitystrea.ms/schema/1.0/video';
173 const AUDIO = 'http://activitystrea.ms/schema/1.0/audio';
174 const BOOKMARK = 'http://activitystrea.ms/schema/1.0/bookmark';
175 const PERSON = 'http://activitystrea.ms/schema/1.0/person';
176 const GROUP = 'http://activitystrea.ms/schema/1.0/group';
177 const PLACE = 'http://activitystrea.ms/schema/1.0/place';
178 const COMMENT = 'http://activitystrea.ms/schema/1.0/comment';
181 // Atom elements we snarf
183 const TITLE = 'title';
184 const SUMMARY = 'summary';
185 const CONTENT = 'content';
187 const SOURCE = 'source';
191 const EMAIL = 'email';
205 * This probably needs to be refactored
206 * to generate a local class (ActivityPerson, ActivityFile, ...)
207 * based on the object type.
209 * @param DOMElement $element DOM thing to turn into an Activity thing
212 function __construct($element = null)
214 if (empty($element)) {
218 $this->element = $element;
220 if ($element->tagName == 'author') {
222 $this->type = self::PERSON; // XXX: is this fair?
223 $this->title = $this->_childContent($element, self::NAME);
224 $this->id = $this->_childContent($element, self::URI);
226 if (empty($this->id)) {
227 $email = $this->_childContent($element, self::EMAIL);
228 if (!empty($email)) {
230 $this->id = 'mailto:'.$email;
236 $this->type = $this->_childContent($element, Activity::OBJECTTYPE,
239 if (empty($this->type)) {
240 $this->type = ActivityObject::NOTE;
243 $this->id = $this->_childContent($element, self::ID);
244 $this->title = $this->_childContent($element, self::TITLE);
245 $this->summary = $this->_childContent($element, self::SUMMARY);
246 $this->content = $this->_childContent($element, self::CONTENT);
248 $this->source = $this->_getSource($element);
250 $this->link = ActivityUtils::getPermalink($element);
252 // XXX: grab PoCo stuff
255 // Some per-type attributes...
256 if ($this->type == self::PERSON || $this->type == self::GROUP) {
257 $this->displayName = $this->title;
259 // @fixme we may have multiple avatars with different resolutions specified
260 $this->avatar = ActivityUtils::getLink($element, 'avatar');
264 private function _childContent($element, $tag, $namespace=ActivityUtils::ATOM)
266 return ActivityUtils::childContent($element, $tag, $namespace);
269 // Try to get a unique id for the source feed
271 private function _getSource($element)
273 $sourceEl = ActivityUtils::child($element, 'source');
275 if (empty($sourceEl)) {
278 $href = ActivityUtils::getLink($sourceEl, 'self');
282 return ActivityUtils::childContent($sourceEl, 'id');
287 static function fromNotice($notice)
289 $object = new ActivityObject();
291 $object->type = ActivityObject::NOTE;
293 $object->id = $notice->uri;
294 $object->title = $notice->content;
295 $object->content = $notice->rendered;
296 $object->link = $notice->bestUrl();
301 function asString($tag='activity:object')
303 $xs = new XMLStringer(true);
305 $xs->elementStart($tag);
307 $xs->element('activity:object-type', null, $this->type);
309 $xs->element(self::ID, null, $this->id);
311 if (!empty($this->title)) {
312 $xs->element(self::TITLE, null, $this->title);
315 if (!empty($this->summary)) {
316 $xs->element(self::SUMMARY, null, $this->summary);
319 if (!empty($this->content)) {
320 // XXX: assuming HTML content here
321 $xs->element(self::CONTENT, array('type' => 'html'), $this->content);
324 if (!empty($this->link)) {
325 $xs->element('link', array('rel' => 'alternate', 'type' => 'text/html'),
329 $xs->elementEnd($tag);
331 return $xs->getString();
336 * Utility class to hold a bunch of constant defining default verb types
340 * @author Evan Prodromou <evan@status.net>
341 * @copyright 2010 StatusNet, Inc.
342 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
343 * @link http://status.net/
348 const POST = 'http://activitystrea.ms/schema/1.0/post';
349 const SHARE = 'http://activitystrea.ms/schema/1.0/share';
350 const SAVE = 'http://activitystrea.ms/schema/1.0/save';
351 const FAVORITE = 'http://activitystrea.ms/schema/1.0/favorite';
352 const PLAY = 'http://activitystrea.ms/schema/1.0/play';
353 const FOLLOW = 'http://activitystrea.ms/schema/1.0/follow';
354 const FRIEND = 'http://activitystrea.ms/schema/1.0/make-friend';
355 const JOIN = 'http://activitystrea.ms/schema/1.0/join';
356 const TAG = 'http://activitystrea.ms/schema/1.0/tag';
358 // Custom OStatus verbs for the flipside until they're standardized
359 const DELETE = 'http://ostatus.org/schema/1.0/unfollow';
360 const UNFAVORITE = 'http://ostatus.org/schema/1.0/unfavorite';
361 const UNFOLLOW = 'http://ostatus.org/schema/1.0/unfollow';
362 const LEAVE = 'http://ostatus.org/schema/1.0/leave';
365 class ActivityContext
370 public $attention = array();
371 public $conversation;
373 const THR = 'http://purl.org/syndication/thread/1.0';
374 const GEORSS = 'http://www.georss.org/georss';
375 const OSTATUS = 'http://ostatus.org/schema/1.0';
377 const INREPLYTO = 'in-reply-to';
381 const POINT = 'point';
383 const ATTENTION = 'ostatus:attention';
384 const CONVERSATION = 'ostatus:conversation';
386 function __construct($element)
388 $replyToEl = ActivityUtils::child($element, self::INREPLYTO, self::THR);
390 if (!empty($replyToEl)) {
391 $this->replyToID = $replyToEl->getAttribute(self::REF);
392 $this->replyToUrl = $replyToEl->getAttribute(self::HREF);
395 $this->location = $this->getLocation($element);
397 $this->conversation = ActivityUtils::getLink($element, self::CONVERSATION);
399 // Multiple attention links allowed
401 $links = $element->getElementsByTagNameNS(ActivityUtils::ATOM, ActivityUtils::LINK);
403 for ($i = 0; $i < $links->length; $i++) {
405 $link = $links->item($i);
407 $linkRel = $link->getAttribute(ActivityUtils::REL);
409 if ($linkRel == self::ATTENTION) {
410 $this->attention[] = $link->getAttribute(self::HREF);
416 * Parse location given as a GeoRSS-simple point, if provided.
417 * http://www.georss.org/simple
419 * @param feed item $entry
420 * @return mixed Location or false
422 function getLocation($dom)
424 $points = $dom->getElementsByTagNameNS(self::GEORSS, self::POINT);
426 for ($i = 0; $i < $points->length; $i++) {
427 $point = $points->item($i)->textContent;
428 $point = str_replace(',', ' ', $point); // per spec "treat commas as whitespace"
429 $point = preg_replace('/\s+/', ' ', $point);
430 $point = trim($point);
431 $coords = explode(' ', $point);
432 if (count($coords) == 2) {
433 list($lat, $lon) = $coords;
434 if (is_numeric($lat) && is_numeric($lon)) {
435 common_log(LOG_INFO, "Looking up location for $lat $lon from georss");
436 return Location::fromLatLon($lat, $lon);
439 common_log(LOG_ERR, "Ignoring bogus georss:point value $point");
447 * An activity in the ActivityStrea.ms world
449 * An activity is kind of like a sentence: someone did something
452 * 'someone' is the 'actor'; 'did something' is the verb;
453 * 'something else' is the object.
457 * @author Evan Prodromou <evan@status.net>
458 * @copyright 2010 StatusNet, Inc.
459 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
460 * @link http://status.net/
465 const SPEC = 'http://activitystrea.ms/spec/1.0/';
466 const SCHEMA = 'http://activitystrea.ms/schema/1.0/';
469 const OBJECT = 'object';
470 const ACTOR = 'actor';
471 const SUBJECT = 'subject';
472 const OBJECTTYPE = 'object-type';
473 const CONTEXT = 'context';
474 const TARGET = 'target';
476 const ATOM = 'http://www.w3.org/2005/Atom';
478 const AUTHOR = 'author';
479 const PUBLISHED = 'published';
480 const UPDATED = 'updated';
482 public $actor; // an ActivityObject
483 public $verb; // a string (the URL)
484 public $object; // an ActivityObject
485 public $target; // an ActivityObject
486 public $context; // an ActivityObject
487 public $time; // Time of the activity
488 public $link; // an ActivityObject
489 public $entry; // the source entry
490 public $feed; // the source feed
493 * Turns a regular old Atom <entry> into a magical activity
495 * @param DOMElement $entry Atom entry to poke at
496 * @param DOMElement $feed Atom feed, for context
499 function __construct($entry, $feed = null)
501 $this->entry = $entry;
504 $pubEl = $this->_child($entry, self::PUBLISHED, self::ATOM);
506 if (!empty($pubEl)) {
507 $this->time = strtotime($pubEl->textContent);
509 // XXX technically an error; being liberal. Good idea...?
510 $updateEl = $this->_child($entry, self::UPDATED, self::ATOM);
511 if (!empty($updateEl)) {
512 $this->time = strtotime($updateEl->textContent);
518 $this->link = ActivityUtils::getPermalink($entry);
520 $verbEl = $this->_child($entry, self::VERB);
522 if (!empty($verbEl)) {
523 $this->verb = trim($verbEl->textContent);
525 $this->verb = ActivityVerb::POST;
526 // XXX: do other implied stuff here
529 $objectEl = $this->_child($entry, self::OBJECT);
531 if (!empty($objectEl)) {
532 $this->object = new ActivityObject($objectEl);
534 $this->object = new ActivityObject($entry);
537 $actorEl = $this->_child($entry, self::ACTOR);
539 if (!empty($actorEl)) {
541 $this->actor = new ActivityObject($actorEl);
543 } else if (!empty($feed) &&
544 $subjectEl = $this->_child($feed, self::SUBJECT)) {
546 $this->actor = new ActivityObject($subjectEl);
548 } else if ($authorEl = $this->_child($entry, self::AUTHOR, self::ATOM)) {
550 $this->actor = new ActivityObject($authorEl);
552 } else if (!empty($feed) && $authorEl = $this->_child($feed, self::AUTHOR,
555 $this->actor = new ActivityObject($authorEl);
558 $contextEl = $this->_child($entry, self::CONTEXT);
560 if (!empty($contextEl)) {
561 $this->context = new ActivityContext($contextEl);
563 $this->context = new ActivityContext($entry);
566 $targetEl = $this->_child($entry, self::TARGET);
568 if (!empty($targetEl)) {
569 $this->target = new ActivityObject($targetEl);
574 * Returns an Atom <entry> based on this activity
576 * @return DOMElement Atom entry
579 function toAtomEntry()
584 private function _child($element, $tag, $namespace=self::SPEC)
586 return ActivityUtils::child($element, $tag, $namespace);