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

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<?php
namespace Activitypub;
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use WP_Post;
use Activitypub\Activity\Activity;
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use Activitypub\Collection\Users;
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use Activitypub\Collection\Followers;
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use Activitypub\Transformer\Post;
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use function Activitypub\is_single_user;
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use function Activitypub\is_user_disabled;
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use function Activitypub\safe_remote_post;
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/**
* ActivityPub Activity_Dispatcher Class
*
* @author Matthias Pfefferle
*
* @see https://www.w3.org/TR/activitypub/
*/
class Activity_Dispatcher {
/**
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* Initialize the class, registering WordPress hooks.
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*/
public static function init() {
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\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 );
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}
/**
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* Send Activities to followers and mentioned users or `Announce` (boost) a blog post.
*
* @param WP_Post $wp_post The ActivityPub Post.
* @param string $type The Activity-Type.
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*
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* @return void
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*/
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public static function send_activity_or_announce( WP_Post $wp_post, $type ) {
// check if a migration is needed before sending new posts
Migration::maybe_migrate();
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if ( is_user_type_disabled( 'blog' ) ) {
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return;
}
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$wp_post->post_author = Users::BLOG_USER_ID;
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if ( is_single_user() ) {
self::send_activity( $wp_post, $type );
} else {
self::send_announce( $wp_post, $type );
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}
}
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/**
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* Send Activities to followers and mentioned users.
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*
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* @param WP_Post $wp_post The ActivityPub Post.
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* @param string $type The Activity-Type.
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*
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* @return void
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*/
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public static function send_activity( WP_Post $wp_post, $type ) {
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if ( is_user_disabled( $wp_post->post_author ) ) {
return;
}
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$object = Post::transform( $wp_post )->to_object();
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$activity = new Activity();
$activity->set_type( $type );
$activity->set_object( $object );
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$follower_inboxes = Followers::get_inboxes( $wp_post->post_author );
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$mentioned_inboxes = Mention::get_inboxes( $activity->get_cc() );
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$inboxes = array_merge( $follower_inboxes, $mentioned_inboxes );
$inboxes = array_unique( $inboxes );
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$json = $activity->to_json();
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foreach ( $inboxes as $inbox ) {
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safe_remote_post( $inbox, $json, $wp_post->post_author );
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}
}
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/**
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* Send Announces to followers and mentioned users.
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*
* @param WP_Post $wp_post The ActivityPub Post.
* @param string $type The Activity-Type.
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*
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* @return void
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*/
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public static function send_announce( WP_Post $wp_post, $type ) {
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if ( ! in_array( $type, array( 'Create', 'Update' ), true ) ) {
return;
}
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if ( is_user_disabled( Users::BLOG_USER_ID ) ) {
return;
}
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$object = Post::transform( $wp_post )->to_object();
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$activity = new Activity();
$activity->set_type( 'Announce' );
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// to pre-fill attributes like "published" and "id"
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$activity->set_object( $object );
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// send only the id
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$activity->set_object( $object->get_id() );
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$follower_inboxes = Followers::get_inboxes( $wp_post->post_author );
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$mentioned_inboxes = Mention::get_inboxes( $activity->get_cc() );
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$inboxes = array_merge( $follower_inboxes, $mentioned_inboxes );
$inboxes = array_unique( $inboxes );
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$json = $activity->to_json();
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foreach ( $inboxes as $inbox ) {
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safe_remote_post( $inbox, $json, $wp_post->post_author );
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}
}
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/**
* Send "delete" activities.
*
* @param str $activitypub_url
* @param int $user_id
*/
public static function send_delete_url_activity( $activitypub_url, $user_id ) {
// get latest version of post
$actor = \get_author_posts_url( $user_id );
$deleted = \current_time( 'Y-m-d\TH:i:s\Z', true );
$activitypub_activity = new \Activitypub\Model\Activity( 'Delete', \Activitypub\Model\Activity::TYPE_SIMPLE );
$activitypub_activity->set_id( $activitypub_url . '#delete' );
$activitypub_activity->set_actor( $actor );
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$activitypub_activity->set_object(
array(
'id' => $activitypub_url,
'type' => 'Tombstone',
)
);
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$activitypub_activity->set_deleted( $deleted );
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 );
}
}
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/**
* Send "create" activities for comments
*
* @param \Activitypub\Model\Comment $activitypub_comment
*/
public static function send_comment_activity( $activitypub_comment_id ) {
//ONLY FOR LOCAL USERS ?
$activitypub_comment = \get_comment( $activitypub_comment_id );
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$user_id = $activitypub_comment->user_id;
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$activitypub_comment = new \Activitypub\Model\Comment( $activitypub_comment );
$activitypub_activity = new \Activitypub\Model\Activity( 'Create', \Activitypub\Model\Activity::TYPE_FULL );
$activitypub_activity->from_comment( $activitypub_comment->to_array() );
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$inboxes = \Activitypub\get_follower_inboxes( $user_id );
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$followers_url = \get_rest_url( null, '/activitypub/1.0/users/' . intval( $user_id ) . '/followers' );
foreach ( $activitypub_activity->get_cc() as $cc ) {
if ( $cc === $followers_url ) {
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continue;
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}
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$inbox = \Activitypub\get_inbox_by_actor( $cc );
if ( ! $inbox || \is_wp_error( $inbox ) ) {
continue;
}
// init array if empty
if ( ! isset( $inboxes[ $inbox ] ) ) {
$inboxes[ $inbox ] = array();
}
$inboxes[ $inbox ][] = $cc;
}
foreach ( $inboxes as $inbox => $to ) {
$to = array_values( array_unique( $to ) );
$activitypub_activity->set_to( $to );
$activity = $activitypub_activity->to_json();
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\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
}
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}
/**
* Forward replies to followers
*
* @param \Activitypub\Model\Comment $activitypub_comment
*/
public static function inbox_forward_activity( $activitypub_comment_id ) {
$activitypub_comment = \get_comment( $activitypub_comment_id );
//original author should NOT recieve a copy of their own post
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$replyto[] = $activitypub_comment->comment_author_url;
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$activitypub_activity = \unserialize( get_comment_meta( $activitypub_comment->comment_ID, 'ap_object', true ) );
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//will be forwarded to the parent_comment->author or post_author followers collection
$parent_comment = \get_comment( $activitypub_comment->comment_parent );
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if ( ! is_null( $parent_comment ) ) {
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$user_id = $parent_comment->user_id;
} else {
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$original_post = \get_post( $activitypub_comment->comment_post_ID );
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$user_id = $original_post->post_author;
}
unset( $activitypub_activity['user_id'] ); // remove user_id from $activitypub_comment
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foreach ( \Activitypub\get_follower_inboxes( $user_id ) as $inbox => $cc ) {
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//Forward reply to followers, skip sender
if ( in_array( $cc, $replyto ) ) {
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continue;
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}
$activitypub_activity['object']['cc'] = $cc;
$activitypub_activity['cc'] = $cc;
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$activity = \wp_json_encode( $activitypub_activity, JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_QUOT );
\Activitypub\forward_remote_post( $inbox, $activity, $user_id );
}
}
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/**
* Send "update" activities.
*
* @param \Activitypub\Model\Comment $activitypub_comment
*/
public static function send_update_comment_activity( $activitypub_comment_id ) {
$activitypub_comment = \get_comment( $activitypub_comment_id );
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$updated = \get_comment_meta( $activitypub_comment_id, 'ap_last_modified', true );
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$user_id = $activitypub_comment->user_id;
if ( ! $user_id ) { // Prevent sending received/anonymous comments.
return;
}
$activitypub_comment = new \Activitypub\Model\Comment( $activitypub_comment );
$activitypub_comment->set_update( $updated );
$activitypub_activity = new \Activitypub\Model\Activity( 'Update', \Activitypub\Model\Activity::TYPE_FULL );
$activitypub_activity->from_comment( $activitypub_comment->to_array() );
$activitypub_activity->set_update( $updated );
$inboxes = \Activitypub\get_follower_inboxes( $user_id );
$followers_url = \get_rest_url( null, '/activitypub/1.0/users/' . intval( $user_id ) . '/followers' );
foreach ( $activitypub_activity->get_cc() as $cc ) {
if ( $cc === $followers_url ) {
continue;
}
$inbox = \Activitypub\get_inbox_by_actor( $cc );
if ( ! $inbox || \is_wp_error( $inbox ) ) {
continue;
}
// init array if empty
if ( ! isset( $inboxes[ $inbox ] ) ) {
$inboxes[ $inbox ] = array();
}
$inboxes[ $inbox ][] = $cc;
}
foreach ( $inboxes as $inbox => $to ) {
$to = array_values( array_unique( $to ) );
$activitypub_activity->set_to( $to );
$activity = $activitypub_activity->to_json();
\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
}
}
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/**
* Send "delete" activities.
*
* @param \Activitypub\Model\Comment $activitypub_comment
*/
public static function send_delete_comment_activity( $activitypub_comment_id ) {
// get comment
$activitypub_comment = \get_comment( $activitypub_comment_id );
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$user_id = $activitypub_comment->user_id;
// Prevent sending received/anonymous comments
if ( ! $user_id ) {
return;
}
$deleted = \wp_date( 'Y-m-d\TH:i:s\Z', \strtotime( $activitypub_comment->comment_date_gmt ) );
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$activitypub_comment = new \Activitypub\Model\Comment( $activitypub_comment );
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$activitypub_comment->set_deleted( $deleted );
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$activitypub_activity = new \Activitypub\Model\Activity( 'Delete', \Activitypub\Model\Activity::TYPE_FULL );
$activitypub_activity->from_comment( $activitypub_comment->to_array() );
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$activitypub_activity->set_deleted( $deleted );
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$inboxes = \Activitypub\get_follower_inboxes( $user_id );
$followers_url = \get_rest_url( null, '/activitypub/1.0/users/' . intval( $user_id ) . '/followers' );
foreach ( $activitypub_activity->get_cc() as $cc ) {
if ( $cc === $followers_url ) {
continue;
}
$inbox = \Activitypub\get_inbox_by_actor( $cc );
if ( ! $inbox || \is_wp_error( $inbox ) ) {
continue;
}
// init array if empty
if ( ! isset( $inboxes[ $inbox ] ) ) {
$inboxes[ $inbox ] = array();
}
$inboxes[ $inbox ][] = $cc;
}
foreach ( $inboxes as $inbox => $to ) {
$to = array_values( array_unique( $to ) );
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$activitypub_activity->set_to( $to );
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$activity = $activitypub_activity->to_json();
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\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
}
}
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}