laipower/wp-content/plugins/activitypub/includes/class-activity-dispatcher.php

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<?php
namespace Activitypub;
use WP_Post;
use WP_Comment;
use Activitypub\Activity\Activity;
use Activitypub\Collection\Users;
use Activitypub\Collection\Followers;
use Activitypub\Transformer\Factory;
use Activitypub\Transformer\Post;
use Activitypub\Transformer\Comment;
use function Activitypub\is_single_user;
use function Activitypub\is_user_disabled;
use function Activitypub\safe_remote_post;
use function Activitypub\set_wp_object_state;
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/**
* ActivityPub Activity_Dispatcher Class
*
* @author Matthias Pfefferle
*
* @see https://www.w3.org/TR/activitypub/
*/
class Activity_Dispatcher {
/**
* Initialize the class, registering WordPress hooks.
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*/
public static function init() {
\add_action( 'activitypub_send_post', array( self::class, 'send_post' ), 10, 2 );
\add_action( 'activitypub_send_comment', array( self::class, 'send_comment' ), 10, 2 );
\add_action( 'activitypub_send_activity', array( self::class, 'send_activity' ), 10, 2 );
\add_action( 'activitypub_send_activity', array( self::class, 'send_activity_or_announce' ), 10, 2 );
\add_action( 'activitypub_send_update_profile_activity', array( self::class, 'send_profile_update' ), 10, 1 );
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}
/**
* Send Activities to followers and mentioned users or `Announce` (boost) a blog post.
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*
* @param mixed $wp_object The ActivityPub Post.
* @param string $type The Activity-Type.
*
* @return void
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*/
public static function send_activity_or_announce( $wp_object, $type ) {
if ( is_user_type_disabled( 'blog' ) ) {
return;
}
if ( is_single_user() ) {
self::send_activity( $wp_object, $type, Users::BLOG_USER_ID );
} else {
self::send_announce( $wp_object, $type );
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}
}
/**
* Send Activities to followers and mentioned users.
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*
* @param mixed $wp_object The ActivityPub Post.
* @param string $type The Activity-Type.
*
* @return void
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*/
public static function send_activity( $wp_object, $type, $user_id = null ) {
$transformer = Factory::get_transformer( $wp_object ); // Could potentially return a `\WP_Error` instance.
if ( \is_wp_error( $transformer ) ) {
return;
}
if ( null !== $user_id ) {
$transformer->change_wp_user_id( $user_id );
}
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$user_id = $transformer->get_wp_user_id();
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if ( is_user_disabled( $user_id ) ) {
return;
}
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$activity = $transformer->to_activity( $type );
self::send_activity_to_followers( $activity, $user_id, $wp_object );
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}
/**
* Send Announces to followers and mentioned users.
*
* @param mixed $wp_object The ActivityPub Post.
* @param string $type The Activity-Type.
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*
* @return void
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*/
public static function send_announce( $wp_object, $type ) {
if ( ! in_array( $type, array( 'Create', 'Update', 'Delete' ), true ) ) {
return;
}
if ( is_user_disabled( Users::BLOG_USER_ID ) ) {
return;
}
$transformer = Factory::get_transformer( $wp_object );
if ( \is_wp_error( $transformer ) ) {
return;
}
$user_id = Users::BLOG_USER_ID;
$activity = $transformer->to_activity( $type );
$user = Users::get_by_id( Users::BLOG_USER_ID );
$announce = new Activity();
$announce->set_type( 'Announce' );
$announce->set_object( $activity );
$announce->set_actor( $user->get_id() );
self::send_activity_to_followers( $announce, $user_id, $wp_object );
}
/**
* Send a "Update" Activity when a user updates their profile.
*
* @param int $user_id The user ID to send an update for.
*
* @return void
*/
public static function send_profile_update( $user_id ) {
$user = Users::get_by_various( $user_id );
// bail if that's not a good user
if ( is_wp_error( $user ) ) {
return;
}
// build the update
$activity = new Activity();
$activity->set_id( $user->get_url() . '#update' );
$activity->set_type( 'Update' );
$activity->set_actor( $user->get_url() );
$activity->set_object( $user->get_url() );
$activity->set_to( 'https://www.w3.org/ns/activitystreams#Public' );
// send the update
self::send_activity_to_followers( $activity, $user_id, $user );
}
/**
* Send an Activity to all followers and mentioned users.
*
* @param Activity $activity The ActivityPub Activity.
* @param int $user_id The user ID.
* @param WP_User|WP_Post|WP_Comment $wp_object The WordPress object.
*
* @return void
*/
private static function send_activity_to_followers( $activity, $user_id, $wp_object ) {
// check if the Activity should be send to the followers
if ( ! apply_filters( 'activitypub_send_activity_to_followers', true, $activity, $user_id, $wp_object ) ) {
return;
}
$follower_inboxes = Followers::get_inboxes( $user_id );
$mentioned_inboxes = array();
$cc = $activity->get_cc();
if ( $cc ) {
$mentioned_inboxes = Mention::get_inboxes( $cc );
}
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$inboxes = array_merge( $follower_inboxes, $mentioned_inboxes );
$inboxes = array_unique( $inboxes );
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if ( empty( $inboxes ) ) {
return;
}
$json = $activity->to_json();
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foreach ( $inboxes as $inbox ) {
safe_remote_post( $inbox, $json, $user_id );
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}
set_wp_object_state( $wp_object, 'federated' );
}
/**
* Send a "Create" or "Update" Activity for a WordPress Post.
*
* @param int $id The WordPress Post ID.
* @param string $type The Activity-Type.
*
* @return void
*/
public static function send_post( $id, $type ) {
$post = get_post( $id );
if ( ! $post ) {
return;
}
do_action( 'activitypub_send_activity', $post, $type );
do_action(
sprintf(
'activitypub_send_%s_activity',
\strtolower( $type )
),
$post
);
}
/**
* Send a "Create" or "Update" Activity for a WordPress Comment.
*
* @param int $id The WordPress Comment ID.
* @param string $type The Activity-Type.
*
* @return void
*/
public static function send_comment( $id, $type ) {
$comment = get_comment( $id );
if ( ! $comment ) {
return;
}
do_action( 'activitypub_send_activity', $comment, $type );
do_action(
sprintf(
'activitypub_send_%s_activity',
\strtolower( $type )
),
$comment
);
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}
}