432 lines
14 KiB
PHP
432 lines
14 KiB
PHP
<?php
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/*
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* GNU Social - a federating social network
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* Copyright (C) 2014, Free Software Foundation, Inc.
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*
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* 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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if (!defined('GNUSOCIAL')) { exit(1); }
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/**
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* Superclass for plugins which add Activity types and such
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*
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* @category Activity
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* @package GNUsocial
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* @author Mikael Nordfeldth <mmn@hethane.se>
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* @copyright 2014 Free Software Foundation, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://gnu.io/social
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*/
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abstract class ActivityHandlerPlugin extends Plugin
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{
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/**
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* Return a list of ActivityStreams object type IRIs
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* which this micro-app handles. Default implementations
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* of the base class will use this list to check if a
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* given ActivityStreams object belongs to us, via
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* $this->isMyNotice() or $this->isMyActivity.
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*
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* An empty list means any type is ok. (Favorite verb etc.)
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*
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* All micro-app classes must override this method.
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*
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* @return array of strings
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*/
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abstract function types();
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/**
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* Return a list of ActivityStreams verb IRIs which
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* this micro-app handles. Default implementations
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* of the base class will use this list to check if a
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* given ActivityStreams verb belongs to us, via
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* $this->isMyNotice() or $this->isMyActivity.
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*
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* All micro-app classes must override this method.
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*
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* @return array of strings
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*/
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function verbs() {
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return array(ActivityVerb::POST);
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}
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/**
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* Check if a given ActivityStreams activity should be handled by this
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* micro-app plugin.
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*
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* The default implementation checks against the activity type list
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* returned by $this->types(), and requires that exactly one matching
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* object be present. You can override this method to expand
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* your checks or to compare the activity's verb, etc.
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*
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* @param Activity $activity
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* @return boolean
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*/
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function isMyActivity(Activity $act) {
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return (count($act->objects) == 1
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&& ($act->objects[0] instanceof ActivityObject)
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&& $this->isMyVerb($act->verb)
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&& $this->isMyType($act->objects[0]->type));
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}
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/**
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* Check if a given notice object should be handled by this micro-app
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* plugin.
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*
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* The default implementation checks against the activity type list
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* returned by $this->types(). You can override this method to expand
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* your checks, but follow the execution chain to get it right.
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*
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* @param Notice $notice
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* @return boolean
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*/
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function isMyNotice(Notice $notice) {
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return $this->isMyVerb($notice->verb) && $this->isMyType($notice->object_type);
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}
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function isMyVerb($verb) {
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$verb = $verb ?: ActivityVerb::POST; // post is the default verb
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return ActivityUtils::compareTypes($verb, $this->verbs());
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}
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function isMyType($type) {
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return count($this->types())===0 || ActivityUtils::compareTypes($type, $this->types());
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}
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/**
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* Given a parsed ActivityStreams activity, your plugin
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* gets to figure out how to actually save it into a notice
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* and any additional data structures you require.
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*
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* This will handle things received via AtomPub, OStatus
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* (PuSH and Salmon transports), or ActivityStreams-based
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* backup/restore of account data.
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*
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* You should be able to accept as input the output from your
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* $this->activityObjectFromNotice(). Where applicable, try to
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* use existing ActivityStreams structures and object types,
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* and be liberal in accepting input from what might be other
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* compatible apps.
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*
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* All micro-app classes must override this method.
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*
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* @fixme are there any standard options?
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*
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* @param Activity $activity
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* @param Profile $actor
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* @param array $options=array()
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*
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* @return Notice the resulting notice
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*/
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abstract function saveNoticeFromActivity(Activity $activity, Profile $actor, array $options=array());
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/**
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* Given an existing Notice object, your plugin gets to
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* figure out how to arrange it into an ActivityStreams
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* object.
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*
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* This will be how your specialized notice gets output in
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* Atom feeds and JSON-based ActivityStreams output, including
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* account backup/restore and OStatus (PuSH and Salmon transports).
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*
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* You should be able to round-trip data from this format back
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* through $this->saveNoticeFromActivity(). Where applicable, try
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* to use existing ActivityStreams structures and object types,
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* and consider interop with other compatible apps.
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*
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* All micro-app classes must override this method.
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*
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* @fixme this outputs an ActivityObject, not an Activity. Any compat issues?
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*
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* @param Notice $notice
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*
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* @return ActivityObject
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*/
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abstract function activityObjectFromNotice(Notice $notice);
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/**
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* When a notice is deleted, you'll be called here for a chance
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* to clean up any related resources.
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*
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* All micro-app classes must override this method.
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*
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* @param Notice $notice
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*/
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abstract function deleteRelated(Notice $notice);
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/**
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* Called when generating Atom XML ActivityStreams output from an
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* ActivityObject belonging to this plugin. Gives the plugin
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* a chance to add custom output.
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*
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* Note that you can only add output of additional XML elements,
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* not change existing stuff here.
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*
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* If output is already handled by the base Activity classes,
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* you can leave this base implementation as a no-op.
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*
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* @param ActivityObject $obj
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* @param XMLOutputter $out to add elements at end of object
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*/
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function activityObjectOutputAtom(ActivityObject $obj, XMLOutputter $out)
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{
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// default is a no-op
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}
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/**
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* Called when generating JSON ActivityStreams output from an
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* ActivityObject belonging to this plugin. Gives the plugin
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* a chance to add custom output.
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*
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* Modify the array contents to your heart's content, and it'll
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* all get serialized out as JSON.
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*
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* If output is already handled by the base Activity classes,
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* you can leave this base implementation as a no-op.
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*
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* @param ActivityObject $obj
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* @param array &$out JSON-targeted array which can be modified
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*/
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public function activityObjectOutputJson(ActivityObject $obj, array &$out)
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{
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// default is a no-op
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}
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/**
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* When a notice is deleted, delete the related objects
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* by calling the overridable $this->deleteRelated().
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*
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* @param Notice $notice Notice being deleted
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*
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* @return boolean hook value
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*/
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function onNoticeDeleteRelated(Notice $notice)
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{
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if (!$this->isMyNotice($notice)) {
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return true;
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}
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$this->deleteRelated($notice);
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}
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/**
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* Render a notice as one of our objects
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*
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* @param Notice $notice Notice to render
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* @param ActivityObject &$object Empty object to fill
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*
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* @return boolean hook value
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*/
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function onStartActivityObjectFromNotice(Notice $notice, &$object)
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{
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if (!$this->isMyNotice($notice)) {
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return true;
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}
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$object = $this->activityObjectFromNotice($notice);
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return false;
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}
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/**
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* Handle a posted object from PuSH
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*
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* @param Activity $activity activity to handle
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* @param Ostatus_profile $oprofile Profile for the feed
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*
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* @return boolean hook value
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*/
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function onStartHandleFeedEntryWithProfile(Activity $activity, $oprofile, &$notice)
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{
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if (!$this->isMyActivity($activity)) {
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return true;
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}
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$actor = $oprofile->checkAuthorship($activity);
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if (!$actor instanceof Ostatus_profile) {
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// TRANS: Client exception thrown when no author for an activity was found.
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throw new ClientException(_('Cannot get author for activity.'));
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}
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$object = $activity->objects[0];
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$options = array('uri' => $object->id,
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'url' => $object->link,
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'is_local' => Notice::REMOTE,
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'source' => 'ostatus');
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// $actor is an ostatus_profile
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$notice = $this->saveNoticeFromActivity($activity, $actor->localProfile(), $options);
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return false;
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}
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/**
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* Handle a posted object from Salmon
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*
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* @param Activity $activity activity to handle
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* @param mixed $target user or group targeted
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*
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* @return boolean hook value
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*/
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function onStartHandleSalmonTarget(Activity $activity, $target)
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{
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if (!$this->isMyActivity($activity)) {
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return true;
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}
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$this->log(LOG_INFO, "Checking {$activity->id} as a valid Salmon slap.");
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if ($target instanceof User_group) {
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$uri = $target->getUri();
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if (!array_key_exists($uri, $activity->context->attention)) {
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// @todo FIXME: please document (i18n).
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// TRANS: Client exception thrown when ...
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throw new ClientException(_('Object not posted to this group.'));
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}
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} else if ($target instanceof User) {
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$uri = $target->uri;
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$original = null;
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if (!empty($activity->context->replyToID)) {
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$original = Notice::getKV('uri', $activity->context->replyToID);
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}
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if (!array_key_exists($uri, $activity->context->attention) &&
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(empty($original) ||
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$original->profile_id != $target->id)) {
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// @todo FIXME: Please document (i18n).
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// TRANS: Client exception when ...
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throw new ClientException(_('Object not posted to this user.'));
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}
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} else {
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// TRANS: Server exception thrown when a micro app plugin uses a target that cannot be handled.
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throw new ServerException(_('Do not know how to handle this kind of target.'));
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}
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$actor = Ostatus_profile::ensureActivityObjectProfile($activity->actor);
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$object = $activity->objects[0];
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$options = array('uri' => $object->id,
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'url' => $object->link,
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'is_local' => Notice::REMOTE,
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'source' => 'ostatus');
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// $actor is an ostatus_profile
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$this->saveNoticeFromActivity($activity, $actor->localProfile(), $options);
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return false;
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}
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/**
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* Handle object posted via AtomPub
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*
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* @param Activity &$activity Activity that was posted
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* @param User $user User that posted it
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* @param Notice &$notice Resulting notice
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*
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* @return boolean hook value
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*/
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function onStartAtomPubNewActivity(Activity &$activity, $user, &$notice)
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{
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if (!$this->isMyActivity($activity)) {
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return true;
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}
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$options = array('source' => 'atompub');
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// $user->getProfile() is a Profile
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$notice = $this->saveNoticeFromActivity($activity,
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$user->getProfile(),
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$options);
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return false;
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}
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/**
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* Handle object imported from a backup file
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*
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* @param User $user User to import for
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* @param ActivityObject $author Original author per import file
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* @param Activity $activity Activity to import
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* @param boolean $trusted Is this a trusted user?
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* @param boolean &$done Is this done (success or unrecoverable error)
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*
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* @return boolean hook value
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*/
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function onStartImportActivity($user, $author, Activity $activity, $trusted, &$done)
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{
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if (!$this->isMyActivity($activity)) {
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return true;
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}
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$obj = $activity->objects[0];
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$options = array('uri' => $object->id,
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'url' => $object->link,
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'source' => 'restore');
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// $user->getProfile() is a Profile
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$saved = $this->saveNoticeFromActivity($activity,
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$user->getProfile(),
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$options);
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if (!empty($saved)) {
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$done = true;
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}
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return false;
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}
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/**
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* Event handler gives the plugin a chance to add custom
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* Atom XML ActivityStreams output from a previously filled-out
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* ActivityObject.
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*
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* The atomOutput method is called if it's one of
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* our matching types.
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*
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* @param ActivityObject $obj
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* @param XMLOutputter $out to add elements at end of object
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* @return boolean hook return value
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*/
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function onEndActivityObjectOutputAtom(ActivityObject $obj, XMLOutputter $out)
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{
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if (in_array($obj->type, $this->types())) {
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$this->activityObjectOutputAtom($obj, $out);
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}
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return true;
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}
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/**
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* Event handler gives the plugin a chance to add custom
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* JSON ActivityStreams output from a previously filled-out
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* ActivityObject.
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*
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* The activityObjectOutputJson method is called if it's one of
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* our matching types.
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*
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* @param ActivityObject $obj
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* @param array &$out JSON-targeted array which can be modified
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* @return boolean hook return value
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*/
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function onEndActivityObjectOutputJson(ActivityObject $obj, array &$out)
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{
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if (in_array($obj->type, $this->types())) {
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$this->activityObjectOutputJson($obj, $out);
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}
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return true;
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}
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}
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