gnu-social/lib/activityhandlerplugin.php

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<?php
/*
* GNU Social - a federating social network
* Copyright (C) 2014, Free Software Foundation, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
if (!defined('GNUSOCIAL')) { exit(1); }
/**
* Superclass for plugins which add Activity types and such
*
* @category Activity
* @package GNUsocial
* @author Mikael Nordfeldth <mmn@hethane.se>
* @copyright 2014 Free Software Foundation, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://gnu.io/social
*/
abstract class ActivityHandlerPlugin extends Plugin
{
/**
* Return a list of ActivityStreams object type IRIs
* which this micro-app handles. Default implementations
* of the base class will use this list to check if a
* given ActivityStreams object belongs to us, via
* $this->isMyNotice() or $this->isMyActivity.
*
* An empty list means any type is ok. (Favorite verb etc.)
*
* All micro-app classes must override this method.
*
* @return array of strings
*/
abstract function types();
/**
* Return a list of ActivityStreams verb IRIs which
* this micro-app handles. Default implementations
* of the base class will use this list to check if a
* given ActivityStreams verb belongs to us, via
* $this->isMyNotice() or $this->isMyActivity.
*
* All micro-app classes must override this method.
*
* @return array of strings
*/
function verbs() {
return array(ActivityVerb::POST);
}
/**
* Check if a given ActivityStreams activity should be handled by this
* micro-app plugin.
*
* The default implementation checks against the activity type list
* returned by $this->types(), and requires that exactly one matching
* object be present. You can override this method to expand
* your checks or to compare the activity's verb, etc.
*
* @param Activity $activity
* @return boolean
*/
function isMyActivity(Activity $act) {
return (count($act->objects) == 1
&& ($act->objects[0] instanceof ActivityObject)
&& $this->isMyVerb($act->verb)
&& $this->isMyType($act->objects[0]->type));
}
/**
* Check if a given notice object should be handled by this micro-app
* plugin.
*
* The default implementation checks against the activity type list
* returned by $this->types(). You can override this method to expand
* your checks, but follow the execution chain to get it right.
*
* @param Notice $notice
* @return boolean
*/
function isMyNotice(Notice $notice) {
return $this->isMyVerb($notice->verb) && $this->isMyType($notice->object_type);
}
function isMyVerb($verb) {
$verb = $verb ?: ActivityVerb::POST; // post is the default verb
return ActivityUtils::compareTypes($verb, $this->verbs());
}
function isMyType($type) {
return count($this->types())===0 || ActivityUtils::compareTypes($type, $this->types());
}
/**
* Given a parsed ActivityStreams activity, your plugin
* gets to figure out how to actually save it into a notice
* and any additional data structures you require.
*
* This function is deprecated and in the future, Notice::saveActivity
* should be called from onStartHandleFeedEntryWithProfile in this class
* (which instead turns to saveObjectFromActivity).
*
* @param Activity $activity
* @param Profile $actor
* @param array $options=array()
*
* @return Notice the resulting notice
*/
public function saveNoticeFromActivity(Activity $activity, Profile $actor, array $options=array())
{
// Any plugin which has not implemented saveObjectFromActivity _must_
// override this function until they are migrated (this function will
// be deleted when all plugins are migrated to saveObjectFromActivity).
if (isset($this->oldSaveNew)) {
throw new ServerException('A function has been called for new saveActivity functionality, but is still set with an oldSaveNew configuration');
}
return Notice::saveActivity($activity, $actor, $options);
}
/**
* Given a parsed ActivityStreams activity, your plugin gets
* to figure out itself how to store the additional data into
* the database, besides the base data stored by the core.
*
* This will handle just about all events where an activity
* object gets saved, whether it is via AtomPub, OStatus
* (PuSH and Salmon transports), or ActivityStreams-based
* backup/restore of account data.
*
* You should be able to accept as input the output from an
* asActivity() call on the stored object. Where applicable,
* try to use existing ActivityStreams structures and object
* types, and be liberal in accepting input from what might
* be other compatible apps.
*
* All micro-app classes must override this method.
*
* @fixme are there any standard options?
*
* @param Activity $activity
* @param Profile $actor
* @param array $options=array()
*
* @return Notice the resulting notice
*/
protected function saveObjectFromActivity(Activity $activity, Notice $stored, array $options=array())
{
throw new ServerException('This function should be abstract when all plugins have migrated to saveObjectFromActivity');
}
/*
* This usually gets called from Notice::saveActivity after a Notice object has been created,
* so it contains a proper id and a uri for the object to be saved.
*/
public function onStoreActivityObject(Activity $act, Notice $stored, array $options=array(), &$object) {
// $this->oldSaveNew is there during a migration period of plugins, to start using
// Notice::saveActivity instead of Notice::saveNew
if (!$this->isMyActivity($act) || isset($this->oldSaveNew)) {
return true;
}
$object = $this->saveObjectFromActivity($act, $stored, $options);
try {
$act->context->attention = array_merge($act->context->attention, $object->getAttentionArray());
} catch (Exception $e) {
common_debug('WARNING: Could not get attention list from object '.get_class($object).'!');
}
return false;
}
/**
* Given an existing Notice object, your plugin gets to
* figure out how to arrange it into an ActivityStreams
* object.
*
* This will be how your specialized notice gets output in
* Atom feeds and JSON-based ActivityStreams output, including
* account backup/restore and OStatus (PuSH and Salmon transports).
*
* You should be able to round-trip data from this format back
* through $this->saveNoticeFromActivity(). Where applicable, try
* to use existing ActivityStreams structures and object types,
* and consider interop with other compatible apps.
*
* All micro-app classes must override this method.
*
* @fixme this outputs an ActivityObject, not an Activity. Any compat issues?
*
* @param Notice $notice
*
* @return ActivityObject
*/
abstract function activityObjectFromNotice(Notice $notice);
/**
* When a notice is deleted, you'll be called here for a chance
* to clean up any related resources.
*
* All micro-app classes must override this method.
*
* @param Notice $notice
*/
abstract function deleteRelated(Notice $notice);
/**
* Called when generating Atom XML ActivityStreams output from an
* ActivityObject belonging to this plugin. Gives the plugin
* a chance to add custom output.
*
* Note that you can only add output of additional XML elements,
* not change existing stuff here.
*
* If output is already handled by the base Activity classes,
* you can leave this base implementation as a no-op.
*
* @param ActivityObject $obj
* @param XMLOutputter $out to add elements at end of object
*/
function activityObjectOutputAtom(ActivityObject $obj, XMLOutputter $out)
{
// default is a no-op
}
/**
* Called when generating JSON ActivityStreams output from an
* ActivityObject belonging to this plugin. Gives the plugin
* a chance to add custom output.
*
* Modify the array contents to your heart's content, and it'll
* all get serialized out as JSON.
*
* If output is already handled by the base Activity classes,
* you can leave this base implementation as a no-op.
*
* @param ActivityObject $obj
* @param array &$out JSON-targeted array which can be modified
*/
public function activityObjectOutputJson(ActivityObject $obj, array &$out)
{
// default is a no-op
}
/**
* When a notice is deleted, delete the related objects
* by calling the overridable $this->deleteRelated().
*
* @param Notice $notice Notice being deleted
*
* @return boolean hook value
*/
function onNoticeDeleteRelated(Notice $notice)
{
if (!$this->isMyNotice($notice)) {
return true;
}
$this->deleteRelated($notice);
}
/**
* Render a notice as one of our objects
*
* @param Notice $notice Notice to render
* @param ActivityObject &$object Empty object to fill
*
* @return boolean hook value
*/
function onStartActivityObjectFromNotice(Notice $notice, &$object)
{
if (!$this->isMyNotice($notice)) {
return true;
}
try {
$object = $this->activityObjectFromNotice($notice);
} catch (NoResultException $e) {
$object = null; // because getKV returns null on failure
}
return false;
}
/**
* Handle a posted object from PuSH
*
* @param Activity $activity activity to handle
* @param Profile $actor Profile for the feed
*
* @return boolean hook value
*/
function onStartHandleFeedEntryWithProfile(Activity $activity, Profile $profile, &$notice)
{
if (!$this->isMyActivity($activity)) {
return true;
}
// We are guaranteed to get a Profile back from checkAuthorship (or it throws an exception)
$profile = ActivityUtils::checkAuthorship($activity, $profile);
$object = $activity->objects[0];
$options = array('uri' => $object->id,
'url' => $object->link,
'is_local' => Notice::REMOTE,
'source' => 'ostatus');
if (!isset($this->oldSaveNew)) {
$notice = Notice::saveActivity($activity, $profile, $options);
} else {
$notice = $this->saveNoticeFromActivity($activity, $profile, $options);
}
return false;
}
/**
* Handle a posted object from Salmon
*
* @param Activity $activity activity to handle
* @param mixed $target user or group targeted
*
* @return boolean hook value
*/
function onStartHandleSalmonTarget(Activity $activity, $target)
{
if (!$this->isMyActivity($activity)) {
return true;
}
$this->log(LOG_INFO, "Checking {$activity->id} as a valid Salmon slap.");
if ($target instanceof User_group || $target->isGroup()) {
$uri = $target->getUri();
if (!array_key_exists($uri, $activity->context->attention)) {
// @todo FIXME: please document (i18n).
// TRANS: Client exception thrown when ...
throw new ClientException(_('Object not posted to this group.'));
}
} elseif ($target instanceof Profile && $target->isLocal()) {
common_debug(get_called_class() . ' got a salmon slap against target profile ID: '.$target->id);
$original = null;
// FIXME: Shouldn't favorites show up with a 'target' activityobject?
if (!ActivityUtils::compareTypes($activity->verb, array(ActivityVerb::POST)) && isset($activity->objects[0])) {
// If this is not a post, it's a verb targeted at something (such as a Favorite attached to a note)
if (!empty($activity->objects[0]->id)) {
$activity->context->replyToID = $activity->objects[0]->id;
}
}
if (!empty($activity->context->replyToID)) {
$original = Notice::getKV('uri', $activity->context->replyToID);
}
if ((!$original instanceof Notice || $original->profile_id != $target->id)
&& !array_key_exists($target->getUri(), $activity->context->attention)) {
// @todo FIXME: Please document (i18n).
// TRANS: Client exception when ...
throw new ClientException(_('Object not posted to this user.'));
}
} else {
// TRANS: Server exception thrown when a micro app plugin uses a target that cannot be handled.
throw new ServerException(_('Do not know how to handle this kind of target.'));
}
common_debug(get_called_class() . ' ensuring ActivityObject profile for '.$activity->actor->id);
$actor = Ostatus_profile::ensureActivityObjectProfile($activity->actor);
// FIXME: will this work in all cases? I made it work for Favorite...
if (ActivityUtils::compareTypes($activity->verb, array(ActivityVerb::POST))) {
$object = $activity->objects[0];
} else {
$object = $activity;
}
$options = array('uri' => $object->id,
'url' => $object->link,
'is_local' => Notice::REMOTE,
'source' => 'ostatus');
// $actor is an ostatus_profile
common_debug(get_called_class() . ' going to save notice from activity!');
if (!isset($this->oldSaveNew)) {
$notice = Notice::saveActivity($activity, $target, $options);
} else {
$notice = $this->saveNoticeFromActivity($activity, $target, $options);
}
return false;
}
/**
* Handle object posted via AtomPub
*
* @param Activity &$activity Activity that was posted
* @param User $user User that posted it
* @param Notice &$notice Resulting notice
*
* @return boolean hook value
*/
function onStartAtomPubNewActivity(Activity &$activity, $user, &$notice)
{
if (!$this->isMyActivity($activity)) {
return true;
}
$options = array('source' => 'atompub');
// $user->getProfile() is a Profile
$notice = $this->saveNoticeFromActivity($activity,
$user->getProfile(),
$options);
return false;
}
/**
* Handle object imported from a backup file
*
* @param User $user User to import for
* @param ActivityObject $author Original author per import file
* @param Activity $activity Activity to import
* @param boolean $trusted Is this a trusted user?
* @param boolean &$done Is this done (success or unrecoverable error)
*
* @return boolean hook value
*/
function onStartImportActivity($user, $author, Activity $activity, $trusted, &$done)
{
if (!$this->isMyActivity($activity)) {
return true;
}
$obj = $activity->objects[0];
$options = array('uri' => $object->id,
'url' => $object->link,
'source' => 'restore');
// $user->getProfile() is a Profile
$saved = $this->saveNoticeFromActivity($activity,
$user->getProfile(),
$options);
if (!empty($saved)) {
$done = true;
}
return false;
}
/**
* Event handler gives the plugin a chance to add custom
* Atom XML ActivityStreams output from a previously filled-out
* ActivityObject.
*
* The atomOutput method is called if it's one of
* our matching types.
*
* @param ActivityObject $obj
* @param XMLOutputter $out to add elements at end of object
* @return boolean hook return value
*/
function onEndActivityObjectOutputAtom(ActivityObject $obj, XMLOutputter $out)
{
if (in_array($obj->type, $this->types())) {
$this->activityObjectOutputAtom($obj, $out);
}
return true;
}
/**
* Event handler gives the plugin a chance to add custom
* JSON ActivityStreams output from a previously filled-out
* ActivityObject.
*
* The activityObjectOutputJson method is called if it's one of
* our matching types.
*
* @param ActivityObject $obj
* @param array &$out JSON-targeted array which can be modified
* @return boolean hook return value
*/
function onEndActivityObjectOutputJson(ActivityObject $obj, array &$out)
{
if (in_array($obj->type, $this->types())) {
$this->activityObjectOutputJson($obj, $out);
}
return true;
}
}