From a72b6cbd54c9cd3c3763164a65926c80a94e573d Mon Sep 17 00:00:00 2001
From: Jeremy Dormitzer <jeremy.dormitzer@gmail.com>
Date: Thu, 31 Jan 2019 10:51:11 -0500
Subject: [PATCH] Implement DeleteHandler

---
 src/Activities/DeleteHandler.php | 71 ++++++++++++++++++++++++++++++++
 src/ActivityPub.php              |  5 ++-
 src/Config/ActivityPubModule.php | 11 +++++
 3 files changed, 86 insertions(+), 1 deletion(-)
 create mode 100644 src/Activities/DeleteHandler.php

diff --git a/src/Activities/DeleteHandler.php b/src/Activities/DeleteHandler.php
new file mode 100644
index 0000000..b61ec08
--- /dev/null
+++ b/src/Activities/DeleteHandler.php
@@ -0,0 +1,71 @@
+<?php
+namespace ActivityPub\Activities;
+
+use ActivityPub\Activities\ActivityEvent;
+use ActivityPub\Activities\InboxActivityEvent;
+use ActivityPub\Activities\OutboxActivityEvent;
+use ActivityPub\Utils\DateTimeProvider;
+use DateTime;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+
+class DeleteHandler implements EventSubscriberInterface
+{
+    /**
+     * @var DateTimeProvider
+     */
+    private $dateTimeProvider;
+
+    /**
+     * @var ObjectsService
+     */
+    private $objectsService;
+
+    public static function getSubscribedEvents()
+    {
+        return array(
+            InboxActivityEvent::NAME => 'handleDelete',
+            OutboxActivityEvent::NAME => 'handleDelete',
+        );
+    }
+
+    public function __construct( DateTimeProvider $dateTimeProvider,
+                                 ObjectsService $objectsService )
+    {
+        $this->dateTimeProvider = $dateTimeProvider;
+        $this->objectsService = $objectsService;
+    }
+
+    private function handleDelete( ActivityEvent $event )
+    {
+        $activity = $event->getActivity();
+        if ( $activity['type'] !== 'Delete' ) {
+            return;
+        }
+        $objectId = $activity['object'];
+        if ( ! is_string( $objectId ) ) {
+            if ( is_array( $objectId ) && array_key_exists( 'id', $objectId ) ) {
+                $objectId = $objectId['id'];
+            } else {
+                throw new BadRequestHttpException( 'Object must have an "id" field' );
+            }
+        }
+        $tombstone = array(
+            '@context' => 'https://www.w3.org/ns/activitystreams',
+            'type' => 'Tombstone',
+            'deleted' => $this->getNowTimestamp(),
+        );
+        $existing = $this->objectsService->dereference( $objectId );
+        if ( $existing ) {
+            $tombstone['formerType'] = $existing['type'];
+        }
+        $this->objectsService->replace( $objectId, $tombstone );
+    }
+
+    private function getNowTimestamp()
+    {
+        return $this->dateTimeProvider->getTime( 'activities.delete' )
+            ->format( DateTime::ISO8601 );
+    }
+}
+?>
diff --git a/src/ActivityPub.php b/src/ActivityPub.php
index 02054b1..ee1dfbb 100644
--- a/src/ActivityPub.php
+++ b/src/ActivityPub.php
@@ -3,6 +3,7 @@ namespace ActivityPub;
 
 use ActivityPub\Activities\CreateHandler;
 use ActivityPub\Activities\NonActivityHandler;
+use ActivityPub\Activities\UpdateHandler;
 use ActivityPub\Activities\ValidationHandler;
 use ActivityPub\Auth\AuthListener;
 use ActivityPub\Auth\SignatureListener;
@@ -56,7 +57,7 @@ class ActivityPub
         $dispatcher->addSubscriber( $this->module->get( SignatureListener::class ) );
         $dispatcher->addSubscriber( new ExceptionListener() );
 
-        $this->subscribeActivityHandler( $dispatcher );
+        $this->subscribeActivityHandlers( $dispatcher );
 
         $controllerResolver = new ControllerResolver();
         $argumentResolver = new ArgumentResolver();
@@ -93,6 +94,8 @@ class ActivityPub
         $dispatcher->addSubscriber( $this->module->get( NonActivityHandler::class ) );
         $dispatcher->addSubscriber( $this->module->get( ValidationHandler::class ) );
         $dispatcher->addSubscriber( $this->module->get( CreateHandler::class ) );
+        $dispatcher->addSubscriber( $this->module->get( UpdateHandler::class ) );
+        $dispatcher->addSubscriber( $this->module->get( DeleteHandler::class ) );
     }
 }
 ?>
diff --git a/src/Config/ActivityPubModule.php b/src/Config/ActivityPubModule.php
index b886004..d2d709d 100644
--- a/src/Config/ActivityPubModule.php
+++ b/src/Config/ActivityPubModule.php
@@ -3,6 +3,8 @@ namespace ActivityPub\Config;
 
 use ActivityPub\Activities\CreateHandler;
 use ActivityPub\Activities\NonActivityHandler;
+use ActivityPub\Activities\DeleteHandler;
+use ActivityPub\Activities\UpdateHandler;
 use ActivityPub\Activities\ValidationHandler;
 use ActivityPub\Auth\AuthListener;
 use ActivityPub\Auth\AuthService;
@@ -109,11 +111,20 @@ class ActivityPubModule
             ->addArgument( new Reference( PostController::class ) );
 
         $this->injector->register( NonActivityHandler::class, NonActivityHandler::class );
+
         $this->injector->register( ValidationHandler::class, ValidationHandler::class );
+
         $this->injector->register( CreateHandler::class, CreateHandler::class )
             ->addArgument( new Reference( ObjectsService::class ) )
             ->addArgument( new Reference( IdProvider::class ) )
             ->addArgument( new Reference( CollectionsService::class ) );
+
+        $this->injector->register( UpdateHandler::class, UpdateHandler::class )
+            ->addArgument( new Reference( ObjectsService::class ) );
+
+        $this->injector->register( DeleteHandler::class, DeleteHandler::class )
+            ->addArgument( new Reference( SimpleDateTimeProvider::class ) )
+            ->addArgument( new Reference( ObjectsService::class ) );
     }
 
     /**