wordpress-activitypub/includes/class-activity-dispatcher.php

<?php
namespace Activitypub;

/**
 * ActivityPub Activity_Dispatcher Class
 *
 * @author Matthias Pfefferle
 *
 * @see https://www.w3.org/TR/activitypub/
 */
class Activity_Dispatcher {
	/**
	 * Initialize the class, registering WordPress hooks
	 */
	public static function init() {
		\add_action( 'activitypub_send_post_activity', array( '\Activitypub\Activity_Dispatcher', 'send_post_activity' ) );
		\add_action( 'activitypub_send_update_activity', array( '\Activitypub\Activity_Dispatcher', 'send_update_activity' ) );
		\add_action( 'activitypub_send_delete_activity', array( '\Activitypub\Activity_Dispatcher', 'send_delete_activity' ) );
	}

	/**
	 * Send "create" activities
	 *
	 * @param int $post_id
	 */
	public static function send_post_activity( $post ) {
		if ( \is_object( $post ) ) {
			$post_id = $post->ID;
		} else {
			$post_id = $post;
		}

		// get latest version of post
		$post = \get_post( $post );
		$user_id = $post->post_author;

		$activitypub_post = new \Activitypub\Model\Post( $post );
		$activitypub_activity = new \Activitypub\Model\Activity( 'Create', \Activitypub\Model\Activity::TYPE_FULL );
		$activitypub_activity->from_post( $activitypub_post->to_array() );

		foreach ( \Activitypub\get_follower_inboxes( $user_id ) as $inbox => $to ) {
			$activitypub_activity->set_to( $to );
			$activity = $activitypub_activity->to_json(); // phpcs:ignore

			\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
		}
	}

	/**
	 * Send "update" activities
	 *
	 * @param int $post_id
	 */
	public static function send_update_activity( $post ) {
		if ( \is_object( $post ) ) {
			$post_id = $post->ID;
		} else {
			$post_id = $post;
		}

		// get latest version of post
		$post = \get_post( $post );
		$user_id = $post->post_author;

		$activitypub_post = new \Activitypub\Model\Post( $post );
		$activitypub_activity = new \Activitypub\Model\Activity( 'Update', \Activitypub\Model\Activity::TYPE_FULL );
		$activitypub_activity->from_post( $activitypub_post->to_array() );

		foreach ( \Activitypub\get_follower_inboxes( $user_id ) as $inbox => $to ) {
			$activitypub_activity->set_to( $to );
			$activity = $activitypub_activity->to_json(); // phpcs:ignore

			\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
		}
	}

	/**
	 * Send "delete" activities
	 *
	 * @param int $post_id
	 */
	public static function send_delete_activity( $post ) {
		$user_id = $post->post_author;

		$activitypub_post = new \Activitypub\Model\Post( $post );
		$activitypub_activity = new \Activitypub\Model\Activity( 'Delete', \Activitypub\Model\Activity::TYPE_FULL );
		$activitypub_activity->from_post( $activitypub_post->to_array() );

		foreach ( \Activitypub\get_follower_inboxes( $user_id ) as $inbox => $to ) {
			$activitypub_activity->set_to( $to );
			$activity = $activitypub_activity->to_json(); // phpcs:ignore

			\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
		}
	}
}