add dummy handlers for incoming event source related activities

and phpcs

includes/activitypub/class-handler.php

@@ -0,0 +1,36 @@
+<?php
+/**
+ * Class responsible for registering handlers for incoming activities to the ActivityPub plugin.
+ *
+ * @package Event_Bridge_For_ActivityPub
+ * @since 1.0.0
+ * @license AGPL-3.0-or-later
+ */
+
+namespace Event_Bridge_For_ActivityPub\ActivityPub;
+
+// Exit if accessed directly.
+defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
+
+use Event_Bridge_For_ActivityPub\ActivityPub\Handler\Accept;
+use Event_Bridge_For_ActivityPub\ActivityPub\Handler\Announce;
+use Event_Bridge_For_ActivityPub\ActivityPub\Handler\Update;
+use Event_Bridge_For_ActivityPub\ActivityPub\Handler\Create;
+use Event_Bridge_For_ActivityPub\ActivityPub\Handler\Delete;
+
+/**
+ *  Class responsible for registering handlers for incoming activities to the ActivityPub plugin.
+ */
+class Handler {
+	/**
+	 * Register all ActivityPub handlers.
+	 */
+	public static function register_handlers() {
+
+		Accept::init();
+		Announce::init();
+		Update::init();
+		Create::init();
+		Delete::init();
+	}
+}

includes/activitypub/collection/class-event-sources.php

@@ -3,6 +3,7 @@
  * Event sources collection file.
  *
  * @package Event_Bridge_For_ActivityPub
+ * @since 1.0.0
  * @license AGPL-3.0-or-later
  */
 
@@ -294,7 +295,7 @@ class Event_Sources {
 
 		$actor = Event_Source::init_from_cpt( get_post( $post_id ) );
 
-		if ( is_wp_error( $actor ) ) {
+		if ( ! $actor instanceof Event_Source ) {
 			return $actor;
 		}
 
@@ -309,7 +310,7 @@ class Event_Sources {
 		$activity->set_cc( null );
 		$activity->set_actor( $application->get_id() );
 		$activity->set_object( $to );
-		$activity->set_id( $actor . '#follow-' . \preg_replace( '~^https?://~', '', $to ) );
+		$activity->set_id( $application->get_id() . '#follow-' . \preg_replace( '~^https?://~', '', $to ) );
 		$activity = $activity->to_json();
 		\Activitypub\safe_remote_post( $inbox, $activity, \Activitypub\Collection\Actors::APPLICATION_USER_ID );
 	}
@@ -345,7 +346,7 @@ class Event_Sources {
 
 		$actor = Event_Source::init_from_cpt( get_post( $post_id ) );
 
-		if ( is_wp_error( $actor ) ) {
+		if ( ! $actor instanceof Event_Source ) {
 			return $actor;
 		}
 

includes/activitypub/handler/class-accept.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * Accept handler file.
+ *
+ * @package Event_Bridge_For_ActivityPub
+ * @since 1.0.0
+ * @license AGPL-3.0-or-later */
+
+namespace Event_Bridge_For_ActivityPub\ActivityPub\Handler;
+
+use Activitypub\Notification;
+use Activitypub\Collection\Actors;
+
+/**
+ * Handle Accept requests.
+ */
+class Accept {
+	/**
+	 * Initialize the class, registering WordPress hooks.
+	 */
+	public static function init() {
+		\add_action(
+			'activitypub_inbox_accept',
+			array( self::class, 'handle_accept' )
+		);
+	}
+
+	/**
+	 * Handle "Follow" requests.
+	 *
+	 * @param array $activity The activity object.
+	 */
+	public static function handle_accept( $activity ) {
+		if ( ! isset( $activity['object'] ) ) {
+			return;
+		}
+
+		$object = Actors::get_by_resource( $activity['object'] );
+
+		if ( ! $object || is_wp_error( $object ) ) {
+			// If we can not find a actor, we handle the `Accept` activity.
+			return;
+		}
+
+		// We only expect `Accept` activities being answers to follow requests by the application actor.
+		if ( Actors::APPLICATION_USER_ID !== $object->get__id() ) {
+			return;
+		}
+	}
+}

includes/activitypub/handler/class-announce.php

@@ -0,0 +1,49 @@
+<?php
+/**
+ * Accept handler file.
+ *
+ * @package Event_Bridge_For_ActivityPub
+ */
+
+namespace Event_Bridge_For_ActivityPub\ActivityPub\Handler;
+
+use Activitypub\Notification;
+use Activitypub\Collection\Actors;
+
+/**
+ * Handle Accept requests.
+ */
+class Announce {
+	/**
+	 * Initialize the class, registering WordPress hooks.
+	 */
+	public static function init() {
+		\add_action(
+			'activitypub_inbox_announce',
+			array( self::class, 'handle_announce' )
+		);
+	}
+
+	/**
+	 * Handle "Announce" requests.
+	 *
+	 * @param array $activity The activity object.
+	 */
+	public static function handle_announce( $activity ) {
+		if ( ! isset( $activity['object'] ) ) {
+			return;
+		}
+
+		$object = Actors::get_by_resource( $activity['object'] );
+
+		if ( ! $object || is_wp_error( $object ) ) {
+			// If we can not find a actor, we handle the `Accept` activity.
+			return;
+		}
+
+		// We only expect `Accept` activities being answers to follow requests by the application actor.
+		if ( Actors::APPLICATION_USER_ID !== $object->get__id() ) {
+			return;
+		}
+	}
+}

includes/activitypub/handler/class-create.php

@@ -0,0 +1,49 @@
+<?php
+/**
+ * Create handler file.
+ *
+ * @package Event_Bridge_For_ActivityPub
+ */
+
+namespace Event_Bridge_For_ActivityPub\ActivityPub\Handler;
+
+use Activitypub\Notification;
+use Activitypub\Collection\Actors;
+
+/**
+ * Handle Create requests.
+ */
+class Create {
+	/**
+	 * Initialize the class, registering WordPress hooks.
+	 */
+	public static function init() {
+		\add_action(
+			'activitypub_inbox_create',
+			array( self::class, 'handle_create' )
+		);
+	}
+
+	/**
+	 * Handle "Create" requests.
+	 *
+	 * @param array $activity The activity object.
+	 */
+	public static function handle_create( $activity ) {
+		if ( ! isset( $activity['object'] ) ) {
+			return;
+		}
+
+		$object = Actors::get_by_resource( $activity['object'] );
+
+		if ( ! $object || is_wp_error( $object ) ) {
+			// If we can not find a actor, we handle the `create` activity.
+			return;
+		}
+
+		// We only expect `create` activities being answers to follow requests by the application actor.
+		if ( Actors::APPLICATION_USER_ID !== $object->get__id() ) {
+			return;
+		}
+	}
+}

includes/activitypub/handler/class-delete.php

@@ -0,0 +1,49 @@
+<?php
+/**
+ * Delete handler file.
+ *
+ * @package Event_Bridge_For_ActivityPub
+ */
+
+namespace Event_Bridge_For_ActivityPub\ActivityPub\Handler;
+
+use Activitypub\Notification;
+use Activitypub\Collection\Actors;
+
+/**
+ * Handle Delete requests.
+ */
+class Delete {
+	/**
+	 * Initialize the class, registering WordPress hooks.
+	 */
+	public static function init() {
+		\add_action(
+			'activitypub_inbox_delete',
+			array( self::class, 'handle_delete' )
+		);
+	}
+
+	/**
+	 * Handle "Follow" requests.
+	 *
+	 * @param array $activity The activity object.
+	 */
+	public static function handle_delete( $activity ) {
+		if ( ! isset( $activity['object'] ) ) {
+			return;
+		}
+
+		$object = Actors::get_by_resource( $activity['object'] );
+
+		if ( ! $object || is_wp_error( $object ) ) {
+			// If we can not find a actor, we handle the `Delete` activity.
+			return;
+		}
+
+		// We only expect `Delete` activities being answers to follow requests by the application actor.
+		if ( Actors::APPLICATION_USER_ID !== $object->get__id() ) {
+			return;
+		}
+	}
+}

includes/activitypub/handler/class-update.php

@@ -0,0 +1,49 @@
+<?php
+/**
+ * Update handler file.
+ *
+ * @package Event_Bridge_For_ActivityPub
+ */
+
+namespace Event_Bridge_For_ActivityPub\ActivityPub\Handler;
+
+use Activitypub\Notification;
+use Activitypub\Collection\Actors;
+
+/**
+ * Handle Update requests.
+ */
+class Update {
+	/**
+	 * Initialize the class, registering WordPress hooks.
+	 */
+	public static function init() {
+		\add_action(
+			'activitypub_inbox_update',
+			array( self::class, 'handle_update' )
+		);
+	}
+
+	/**
+	 * Handle "Follow" requests.
+	 *
+	 * @param array $activity The activity object.
+	 */
+	public static function handle_update( $activity ) {
+		if ( ! isset( $activity['object'] ) ) {
+			return;
+		}
+
+		$object = Actors::get_by_resource( $activity['object'] );
+
+		if ( ! $object || is_wp_error( $object ) ) {
+			// If we can not find a actor, we handle the `Update` activity.
+			return;
+		}
+
+		// We only expect `Update` activities being answers to follow requests by the application actor.
+		if ( Actors::APPLICATION_USER_ID !== $object->get__id() ) {
+			return;
+		}
+	}
+}

includes/admin/class-settings-page.php

@@ -77,8 +77,7 @@ class Settings_Page {
 
 		if ( isset( $url['path'] ) && isset( $url['host'] ) && isset( $url['scheme'] ) ) {
 			$actor_url = $event_source;
-		} else {
+		} elseif ( preg_match( '/^@?' . Event_Source::ACTIVITYPUB_USER_HANDLE_REGEXP . '$/i', $event_source ) ) {
-			if ( preg_match( '/^@?' . Event_Source::ACTIVITYPUB_USER_HANDLE_REGEXP . '$/i', $event_source ) ) {
 			$actor_url = Webfinger::resolve( $event_source );
 			if ( is_wp_error( $actor_url ) ) {
 				return;
@@ -91,7 +90,6 @@ class Settings_Page {
 				$actor_url = Event_Sources::get_application_actor( $event_source );
 			}
 		}
-		}
 
 		if ( ! $actor_url ) {
 			return;

includes/class-event-sources.php

@@ -3,6 +3,8 @@
  * Class for handling and saving the ActivityPub event sources (i.e. follows).
  *
  * @package Event_Bridge_For_ActivityPub
+ * @since 1.0.0
+ * @license AGPL-3.0-or-later
  */
 
 namespace Event_Bridge_For_ActivityPub;

includes/class-setup.php

@@ -15,12 +15,13 @@ namespace Event_Bridge_For_ActivityPub;
 // Exit if accessed directly.
 defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
 
+use Event_Bridge_For_ActivityPub\ActivityPub\Collection\Event_Sources as Event_Sources_Collection;
+use Event_Bridge_For_ActivityPub\ActivityPub\Handler;
 use Event_Bridge_For_ActivityPub\Admin\Event_Plugin_Admin_Notices;
 use Event_Bridge_For_ActivityPub\Admin\General_Admin_Notices;
 use Event_Bridge_For_ActivityPub\Admin\Health_Check;
 use Event_Bridge_For_ActivityPub\Admin\Settings_Page;
 use Event_Bridge_For_ActivityPub\Integrations\Event_Plugin;
-use Event_Bridge_For_ActivityPub\ActivityPub\Collection\Event_Sources as Event_Sources_Collection;
 
 require_once ABSPATH . 'wp-admin/includes/plugin.php';
 
@@ -178,6 +179,8 @@ class Setup {
 			array( Settings_Page::class, 'settings_link' )
 		);
 
+		add_action( 'activitypub_register_handlers', array( Handler::class, 'register_activitypub_handlers' ) ) ;
+
 		// If we don't have any active event plugins, or the ActivityPub plugin is not enabled, abort here.
 		if ( empty( $this->active_event_plugins ) || ! $this->activitypub_plugin_is_active ) {
 			return;

includes/integrations/class-event-plugin.php

@@ -6,6 +6,7 @@
  *
  * @package Event_Bridge_For_ActivityPub
  * @since 1.0.0
+ * @license AGPL-3.0-or-later
  */
 
 namespace Event_Bridge_For_ActivityPub\Integrations;

includes/table/class-event-sources.php

@@ -3,6 +3,8 @@
  * Event Sources Table-Class file.
  *
  * @package Event_Bridge_For_ActivityPub
+ * @since 1.0.0
+ * @license AGPL-3.0-or-later
  */
 
 namespace Event_Bridge_For_ActivityPub\Table;

templates/event-sources.php

@@ -3,6 +3,8 @@
  * Event Sources management page for the ActivityPub Event Bridge.
  *
  * @package Event_Bridge_For_ActivityPub
+ * @since 1.0.0
+ * @license AGPL-3.0-or-later
  */
 
 // Exit if accessed directly.