3 * GNU Social - a federating social network
4 * Copyright (C) 2014, Free Software Foundation, Inc.
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU Affero General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Affero General Public License for more details.
16 * You should have received a copy of the GNU Affero General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 if (!defined('GNUSOCIAL')) { exit(1); }
23 * Superclass for plugins which add Activity types and such
27 * @author Mikael Nordfeldth <mmn@hethane.se>
28 * @copyright 2014 Free Software Foundation, Inc.
29 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
30 * @link http://gnu.io/social
32 abstract class ActivityHandlerPlugin extends Plugin
35 * Return a list of ActivityStreams object type IRIs
36 * which this micro-app handles. Default implementations
37 * of the base class will use this list to check if a
38 * given ActivityStreams object belongs to us, via
39 * $this->isMyNotice() or $this->isMyActivity.
41 * An empty list means any type is ok. (Favorite verb etc.)
43 * All micro-app classes must override this method.
45 * @return array of strings
47 abstract function types();
50 * Return a list of ActivityStreams verb IRIs which
51 * this micro-app handles. Default implementations
52 * of the base class will use this list to check if a
53 * given ActivityStreams verb belongs to us, via
54 * $this->isMyNotice() or $this->isMyActivity.
56 * All micro-app classes must override this method.
58 * @return array of strings
61 return array(ActivityVerb::POST);
65 * Check if a given ActivityStreams activity should be handled by this
68 * The default implementation checks against the activity type list
69 * returned by $this->types(), and requires that exactly one matching
70 * object be present. You can override this method to expand
71 * your checks or to compare the activity's verb, etc.
73 * @param Activity $activity
76 function isMyActivity(Activity $act) {
77 return (count($act->objects) == 1
78 && ($act->objects[0] instanceof ActivityObject)
79 && $this->isMyVerb($act->verb)
80 && $this->isMyType($act->objects[0]->type));
84 * Check if a given notice object should be handled by this micro-app
87 * The default implementation checks against the activity type list
88 * returned by $this->types(). You can override this method to expand
89 * your checks, but follow the execution chain to get it right.
91 * @param Notice $notice
94 function isMyNotice(Notice $notice) {
95 return $this->isMyVerb($notice->verb) && $this->isMyType($notice->object_type);
98 function isMyVerb($verb) {
99 $verb = $verb ?: ActivityVerb::POST; // post is the default verb
100 return ActivityUtils::compareTypes($verb, $this->verbs());
103 function isMyType($type) {
104 return count($this->types())===0 || ActivityUtils::compareTypes($type, $this->types());
108 * Given a parsed ActivityStreams activity, your plugin
109 * gets to figure out how to actually save it into a notice
110 * and any additional data structures you require.
112 * This function is deprecated and in the future, Notice::saveActivity
113 * should be called from onStartHandleFeedEntryWithProfile in this class.
115 * @param Activity $activity
116 * @param Profile $actor
117 * @param array $options=array()
119 * @return Notice the resulting notice
121 public function saveNoticeFromActivity(Activity $activity, Profile $actor, array $options=array())
123 // Any plugin which has not implemented saveObjectFromActivity _must_
124 // override this function (which will be deleted when all plugins are migrated).
126 if (isset($this->oldSaveNew)) {
127 throw new ServerException('A function has been called for new saveActivity functionality, but is still set with an oldSaveNew configuration');
130 return Notice::saveActivity($activity, $actor, $options);
134 * This usually gets called from Notice::saveActivity after a Notice object has been created,
135 * so it contains a proper id and a uri for the object to be saved.
137 public function onStoreActivityObject(Activity $act, Notice $stored, array $options=array(), &$object) {
138 // $this->oldSaveNew is there during a migration period of plugins, to start using
139 // Notice::saveActivity instead of Notice::saveNew
140 if (!$this->isMyActivity($act) || isset($this->oldSaveNew)) {
143 $object = $this->saveObjectFromActivity($act, $stored, $options);
145 $act->context->attention = array_merge($act->context->attention, $object->getAttentionArray());
146 } catch (Exception $e) {
147 common_debug('WARNING: Could not get attention list from object '.get_class($object).'!');
153 * Given an existing Notice object, your plugin gets to
154 * figure out how to arrange it into an ActivityStreams
157 * This will be how your specialized notice gets output in
158 * Atom feeds and JSON-based ActivityStreams output, including
159 * account backup/restore and OStatus (PuSH and Salmon transports).
161 * You should be able to round-trip data from this format back
162 * through $this->saveNoticeFromActivity(). Where applicable, try
163 * to use existing ActivityStreams structures and object types,
164 * and consider interop with other compatible apps.
166 * All micro-app classes must override this method.
168 * @fixme this outputs an ActivityObject, not an Activity. Any compat issues?
170 * @param Notice $notice
172 * @return ActivityObject
174 abstract function activityObjectFromNotice(Notice $notice);
177 * When a notice is deleted, you'll be called here for a chance
178 * to clean up any related resources.
180 * All micro-app classes must override this method.
182 * @param Notice $notice
184 abstract function deleteRelated(Notice $notice);
187 * Called when generating Atom XML ActivityStreams output from an
188 * ActivityObject belonging to this plugin. Gives the plugin
189 * a chance to add custom output.
191 * Note that you can only add output of additional XML elements,
192 * not change existing stuff here.
194 * If output is already handled by the base Activity classes,
195 * you can leave this base implementation as a no-op.
197 * @param ActivityObject $obj
198 * @param XMLOutputter $out to add elements at end of object
200 function activityObjectOutputAtom(ActivityObject $obj, XMLOutputter $out)
202 // default is a no-op
206 * Called when generating JSON ActivityStreams output from an
207 * ActivityObject belonging to this plugin. Gives the plugin
208 * a chance to add custom output.
210 * Modify the array contents to your heart's content, and it'll
211 * all get serialized out as JSON.
213 * If output is already handled by the base Activity classes,
214 * you can leave this base implementation as a no-op.
216 * @param ActivityObject $obj
217 * @param array &$out JSON-targeted array which can be modified
219 public function activityObjectOutputJson(ActivityObject $obj, array &$out)
221 // default is a no-op
225 * When a notice is deleted, delete the related objects
226 * by calling the overridable $this->deleteRelated().
228 * @param Notice $notice Notice being deleted
230 * @return boolean hook value
232 function onNoticeDeleteRelated(Notice $notice)
234 if (!$this->isMyNotice($notice)) {
238 $this->deleteRelated($notice);
242 * Render a notice as one of our objects
244 * @param Notice $notice Notice to render
245 * @param ActivityObject &$object Empty object to fill
247 * @return boolean hook value
249 function onStartActivityObjectFromNotice(Notice $notice, &$object)
251 if (!$this->isMyNotice($notice)) {
255 $object = $this->activityObjectFromNotice($notice);
260 * Handle a posted object from PuSH
262 * @param Activity $activity activity to handle
263 * @param Profile $actor Profile for the feed
265 * @return boolean hook value
267 function onStartHandleFeedEntryWithProfile(Activity $activity, Profile $profile, &$notice)
269 if (!$this->isMyActivity($activity)) {
273 // We are guaranteed to get a Profile back from checkAuthorship (or it throws an exception)
274 $profile = ActivityUtils::checkAuthorship($activity, $profile);
276 $object = $activity->objects[0];
278 $options = array('uri' => $object->id,
279 'url' => $object->link,
280 'is_local' => Notice::REMOTE,
281 'source' => 'ostatus');
283 $notice = $this->saveNoticeFromActivity($activity, $profile, $options);
289 * Handle a posted object from Salmon
291 * @param Activity $activity activity to handle
292 * @param mixed $target user or group targeted
294 * @return boolean hook value
297 function onStartHandleSalmonTarget(Activity $activity, $target)
299 if (!$this->isMyActivity($activity)) {
303 $this->log(LOG_INFO, "Checking {$activity->id} as a valid Salmon slap.");
305 if ($target instanceof User_group) {
306 $uri = $target->getUri();
307 if (!array_key_exists($uri, $activity->context->attention)) {
308 // @todo FIXME: please document (i18n).
309 // TRANS: Client exception thrown when ...
310 throw new ClientException(_('Object not posted to this group.'));
312 } else if ($target instanceof User) {
315 if (!empty($activity->context->replyToID)) {
316 $original = Notice::getKV('uri', $activity->context->replyToID);
318 if (!array_key_exists($uri, $activity->context->attention) &&
320 $original->profile_id != $target->id)) {
321 // @todo FIXME: Please document (i18n).
322 // TRANS: Client exception when ...
323 throw new ClientException(_('Object not posted to this user.'));
326 // TRANS: Server exception thrown when a micro app plugin uses a target that cannot be handled.
327 throw new ServerException(_('Do not know how to handle this kind of target.'));
330 $actor = Ostatus_profile::ensureActivityObjectProfile($activity->actor);
332 $object = $activity->objects[0];
334 $options = array('uri' => $object->id,
335 'url' => $object->link,
336 'is_local' => Notice::REMOTE,
337 'source' => 'ostatus');
339 // $actor is an ostatus_profile
340 $this->saveNoticeFromActivity($activity, $actor->localProfile(), $options);
346 * Handle object posted via AtomPub
348 * @param Activity &$activity Activity that was posted
349 * @param User $user User that posted it
350 * @param Notice &$notice Resulting notice
352 * @return boolean hook value
354 function onStartAtomPubNewActivity(Activity &$activity, $user, &$notice)
356 if (!$this->isMyActivity($activity)) {
360 $options = array('source' => 'atompub');
362 // $user->getProfile() is a Profile
363 $notice = $this->saveNoticeFromActivity($activity,
371 * Handle object imported from a backup file
373 * @param User $user User to import for
374 * @param ActivityObject $author Original author per import file
375 * @param Activity $activity Activity to import
376 * @param boolean $trusted Is this a trusted user?
377 * @param boolean &$done Is this done (success or unrecoverable error)
379 * @return boolean hook value
381 function onStartImportActivity($user, $author, Activity $activity, $trusted, &$done)
383 if (!$this->isMyActivity($activity)) {
387 $obj = $activity->objects[0];
389 $options = array('uri' => $object->id,
390 'url' => $object->link,
391 'source' => 'restore');
393 // $user->getProfile() is a Profile
394 $saved = $this->saveNoticeFromActivity($activity,
398 if (!empty($saved)) {
406 * Event handler gives the plugin a chance to add custom
407 * Atom XML ActivityStreams output from a previously filled-out
410 * The atomOutput method is called if it's one of
411 * our matching types.
413 * @param ActivityObject $obj
414 * @param XMLOutputter $out to add elements at end of object
415 * @return boolean hook return value
417 function onEndActivityObjectOutputAtom(ActivityObject $obj, XMLOutputter $out)
419 if (in_array($obj->type, $this->types())) {
420 $this->activityObjectOutputAtom($obj, $out);
426 * Event handler gives the plugin a chance to add custom
427 * JSON ActivityStreams output from a previously filled-out
430 * The activityObjectOutputJson method is called if it's one of
431 * our matching types.
433 * @param ActivityObject $obj
434 * @param array &$out JSON-targeted array which can be modified
435 * @return boolean hook return value
437 function onEndActivityObjectOutputJson(ActivityObject $obj, array &$out)
439 if (in_array($obj->type, $this->types())) {
440 $this->activityObjectOutputJson($obj, $out);