517 lines
13 KiB
PHP
517 lines
13 KiB
PHP
<?php
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namespace Activitypub\Collection;
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use WP_Error;
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use Exception;
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use WP_Query;
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use Activitypub\Http;
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use Activitypub\Webfinger;
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use Activitypub\Model\Follower;
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use Activitypub\Collection\Users;
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use Activitypub\Activity\Activity;
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use Activitypub\Activity\Base_Object;
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use function Activitypub\is_tombstone;
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use function Activitypub\get_remote_metadata_by_actor;
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/**
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* ActivityPub Followers Collection
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*
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* @author Matt Wiebe
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* @author Matthias Pfefferle
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*/
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class Followers {
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const POST_TYPE = 'ap_follower';
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const CACHE_KEY_INBOXES = 'follower_inboxes_%s';
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/**
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* Register WordPress hooks/actions and register Taxonomy
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*
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* @return void
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*/
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public static function init() {
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// register "followers" post_type
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self::register_post_type();
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\add_action( 'activitypub_inbox_follow', array( self::class, 'handle_follow_request' ), 10, 2 );
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\add_action( 'activitypub_inbox_undo', array( self::class, 'handle_undo_request' ), 10, 2 );
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\add_action( 'activitypub_followers_post_follow', array( self::class, 'send_follow_response' ), 10, 4 );
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}
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/**
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* Register the "Followers" Taxonomy
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*
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* @return void
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*/
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private static function register_post_type() {
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register_post_type(
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self::POST_TYPE,
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array(
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'labels' => array(
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'name' => _x( 'Followers', 'post_type plural name', 'activitypub' ),
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'singular_name' => _x( 'Follower', 'post_type single name', 'activitypub' ),
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),
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'public' => false,
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'hierarchical' => false,
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'rewrite' => false,
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'query_var' => false,
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'delete_with_user' => false,
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'can_export' => true,
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'supports' => array(),
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)
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);
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register_post_meta(
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self::POST_TYPE,
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'activitypub_inbox',
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array(
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'type' => 'string',
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'single' => true,
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'sanitize_callback' => array( self::class, 'sanitize_url' ),
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)
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);
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register_post_meta(
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self::POST_TYPE,
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'activitypub_errors',
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array(
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'type' => 'string',
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'single' => false,
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'sanitize_callback' => function( $value ) {
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if ( ! is_string( $value ) ) {
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throw new Exception( 'Error message is no valid string' );
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}
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return esc_sql( $value );
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},
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)
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);
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register_post_meta(
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self::POST_TYPE,
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'activitypub_user_id',
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array(
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'type' => 'string',
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'single' => false,
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'sanitize_callback' => function( $value ) {
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return esc_sql( $value );
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},
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)
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);
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register_post_meta(
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self::POST_TYPE,
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'activitypub_actor_json',
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array(
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'type' => 'string',
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'single' => true,
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'sanitize_callback' => function( $value ) {
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return sanitize_text_field( $value );
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},
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)
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);
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do_action( 'activitypub_after_register_post_type' );
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}
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public static function sanitize_url( $value ) {
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if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
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return null;
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}
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return esc_url_raw( $value );
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}
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/**
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* Handle the "Follow" Request
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*
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* @param array $object The JSON "Follow" Activity
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* @param int $user_id The ID of the ID of the WordPress User
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*
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* @return void
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*/
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public static function handle_follow_request( $object, $user_id ) {
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// save follower
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$follower = self::add_follower( $user_id, $object['actor'] );
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do_action( 'activitypub_followers_post_follow', $object['actor'], $object, $user_id, $follower );
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}
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/**
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* Handle "Unfollow" requests
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*
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* @param array $object The JSON "Undo" Activity
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* @param int $user_id The ID of the ID of the WordPress User
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*/
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public static function handle_undo_request( $object, $user_id ) {
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if (
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isset( $object['object'] ) &&
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isset( $object['object']['type'] ) &&
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'Follow' === $object['object']['type']
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) {
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self::remove_follower( $user_id, $object['actor'] );
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}
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}
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/**
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* Add new Follower
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*
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* @param int $user_id The ID of the WordPress User
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* @param string $actor The Actor URL
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*
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* @return array|WP_Error The Follower (WP_Term array) or an WP_Error
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*/
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public static function add_follower( $user_id, $actor ) {
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$meta = get_remote_metadata_by_actor( $actor );
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if ( is_tombstone( $meta ) ) {
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return $meta;
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}
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$error = null;
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$follower = new Follower();
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if ( empty( $meta ) || ! is_array( $meta ) || is_wp_error( $meta ) ) {
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$follower->set_id( $actor );
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$follower->set_url( $actor );
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$error = $meta;
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} else {
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$follower->from_array( $meta );
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}
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$follower->upsert();
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$meta = get_post_meta( $follower->get__id(), 'activitypub_user_id' );
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if ( $error ) {
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self::add_error( $follower->get__id(), $error );
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}
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// phpcs:ignore WordPress.PHP.StrictInArray.MissingTrueStrict
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if ( is_array( $meta ) && ! in_array( $user_id, $meta ) ) {
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add_post_meta( $follower->get__id(), 'activitypub_user_id', $user_id );
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wp_cache_delete( sprintf( self::CACHE_KEY_INBOXES, $user_id ), 'activitypub' );
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}
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return $follower;
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}
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/**
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* Remove a Follower
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*
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* @param int $user_id The ID of the WordPress User
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* @param string $actor The Actor URL
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*
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* @return bool|WP_Error True on success, false or WP_Error on failure.
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*/
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public static function remove_follower( $user_id, $actor ) {
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wp_cache_delete( sprintf( self::CACHE_KEY_INBOXES, $user_id ), 'activitypub' );
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$follower = self::get_follower( $user_id, $actor );
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if ( ! $follower ) {
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return false;
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}
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return delete_post_meta( $follower->get__id(), 'activitypub_user_id', $user_id );
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}
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/**
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* Get a Follower
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*
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* @param int $user_id The ID of the WordPress User
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* @param string $actor The Actor URL
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*
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* @return \Activitypub\Model\Follower The Follower object
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*/
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public static function get_follower( $user_id, $actor ) {
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global $wpdb;
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$post_id = $wpdb->get_var(
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$wpdb->prepare(
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"SELECT DISTINCT p.ID FROM $wpdb->posts p INNER JOIN $wpdb->postmeta pm ON p.ID = pm.post_id WHERE p.post_type = %s AND pm.meta_key = 'activitypub_user_id' AND pm.meta_value = %d AND p.guid = %s",
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array(
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esc_sql( self::POST_TYPE ),
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esc_sql( $user_id ),
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esc_sql( $actor ),
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)
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)
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);
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if ( $post_id ) {
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$post = get_post( $post_id );
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return Follower::init_from_cpt( $post );
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}
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return null;
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}
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/**
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* Send Accept response
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*
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* @param string $actor The Actor URL
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* @param array $object The Activity object
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* @param int $user_id The ID of the WordPress User
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* @param Activitypub\Model\Follower $follower The Follower object
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*
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* @return void
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*/
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public static function send_follow_response( $actor, $object, $user_id, $follower ) {
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if ( is_wp_error( $follower ) ) {
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// it is not even possible to send a "Reject" because
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// we can not get the Remote-Inbox
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return;
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}
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if ( isset( $object['user_id'] ) ) {
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unset( $object['user_id'] );
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}
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unset( $object['@context'] );
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$user = Users::get_by_id( $user_id );
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// get inbox
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$inbox = $follower->get_shared_inbox();
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// send "Accept" activity
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$activity = new Activity();
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$activity->set_type( 'Accept' );
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$activity->set_object( $object );
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$activity->set_actor( $user->get_id() );
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$activity->set_to( $actor );
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$activity->set_id( $user->get_id() . '#follow-' . \preg_replace( '~^https?://~', '', $actor ) );
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$activity = $activity->to_json();
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$response = Http::post( $inbox, $activity, $user_id );
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}
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/**
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* Get the Followers of a given user
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*
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* @param int $user_id The ID of the WordPress User
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* @param string $output The output format, supported ARRAY_N, OBJECT and ACTIVITYPUB_OBJECT
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* @param int $number Limts the result
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* @param int $offset Offset
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*
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* @return array The Term list of Followers, the format depends on $output
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*/
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public static function get_followers( $user_id, $number = -1, $page = null, $args = array() ) {
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$defaults = array(
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'post_type' => self::POST_TYPE,
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'posts_per_page' => $number,
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'paged' => $page,
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'orderby' => 'ID',
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'order' => 'DESC',
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'meta_query' => array(
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array(
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'key' => 'activitypub_user_id',
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'value' => $user_id,
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),
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),
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);
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$args = wp_parse_args( $args, $defaults );
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$query = new WP_Query( $args );
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$posts = $query->get_posts();
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$items = array();
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foreach ( $posts as $post ) {
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$items[] = Follower::init_from_cpt( $post ); // phpcs:ignore
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}
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return $items;
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}
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/**
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* Get all Followers
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*
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* @param array $args The WP_Query arguments.
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*
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* @return array The Term list of Followers.
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*/
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public static function get_all_followers() {
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$args = array(
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'meta_query' => array(),
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);
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return self::get_followers( null, null, null, $args );
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}
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/**
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* Count the total number of followers
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*
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* @param int $user_id The ID of the WordPress User
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*
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* @return int The number of Followers
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*/
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public static function count_followers( $user_id ) {
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$query = new WP_Query(
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array(
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'post_type' => self::POST_TYPE,
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'fields' => 'ids',
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'meta_query' => array(
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array(
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'key' => 'activitypub_user_id',
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'value' => $user_id,
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),
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),
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)
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);
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return $query->found_posts;
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}
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/**
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* Returns all Inboxes fo a Users Followers
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*
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* @param int $user_id The ID of the WordPress User
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*
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* @return array The list of Inboxes
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*/
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public static function get_inboxes( $user_id ) {
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$cache_key = sprintf( self::CACHE_KEY_INBOXES, $user_id );
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$inboxes = wp_cache_get( $cache_key, 'activitypub' );
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if ( $inboxes ) {
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return $inboxes;
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}
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// get all Followers of a ID of the WordPress User
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$posts = new WP_Query(
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array(
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'post_type' => self::POST_TYPE,
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'fields' => 'ids',
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'meta_query' => array(
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array(
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'key' => 'activitypub_inbox',
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'compare' => 'EXISTS',
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),
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array(
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'key' => 'activitypub_user_id',
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'value' => $user_id,
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),
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),
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)
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);
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$posts = $posts->get_posts();
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if ( ! $posts ) {
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return array();
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}
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global $wpdb;
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$results = $wpdb->get_col(
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$wpdb->prepare(
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"SELECT DISTINCT meta_value FROM {$wpdb->postmeta}
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WHERE post_id IN (" . implode( ', ', array_fill( 0, count( $posts ), '%d' ) ) . ")
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AND meta_key = 'activitypub_inbox'
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AND meta_value IS NOT NULL",
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$posts
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)
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);
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$inboxes = array_filter( $results );
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wp_cache_set( $cache_key, $inboxes, 'activitypub' );
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return $inboxes;
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}
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/**
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* Get all Followers that have not been updated for a given time
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*
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* @param enum $output The output format, supported ARRAY_N, OBJECT and ACTIVITYPUB_OBJECT.
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* @param int $number Limits the result.
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* @param int $older_than The time in seconds.
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*
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* @return mixed The Term list of Followers, the format depends on $output.
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*/
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public static function get_outdated_followers( $number = 50, $older_than = 604800 ) {
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$args = array(
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'post_type' => self::POST_TYPE,
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'posts_per_page' => $number,
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'orderby' => 'modified',
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'order' => 'DESC',
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'post_status' => 'any', // 'any' includes 'trash
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'date_query' => array(
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array(
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'column' => 'post_modified_gmt',
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'before' => gmdate( 'Y-m-d', \time() - $older_than ),
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),
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),
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);
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$posts = new WP_Query( $args );
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$items = array();
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foreach ( $posts->get_posts() as $follower ) {
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$items[] = Follower::init_from_cpt( $follower ); // phpcs:ignore
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}
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return $items;
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}
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/**
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* Get all Followers that had errors
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*
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* @param enum $output The output format, supported ARRAY_N, OBJECT and ACTIVITYPUB_OBJECT
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* @param integer $number The number of Followers to return.
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*
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* @return mixed The Term list of Followers, the format depends on $output.
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*/
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public static function get_faulty_followers( $number = 10 ) {
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$args = array(
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'post_type' => self::POST_TYPE,
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'posts_per_page' => $number,
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'meta_query' => array(
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array(
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'key' => 'activitypub_errors',
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'compare' => 'EXISTS',
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),
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),
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);
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$posts = new WP_Query( $args );
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$items = array();
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foreach ( $posts->get_posts() as $follower ) {
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$items[] = Follower::init_from_cpt( $follower ); // phpcs:ignore
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}
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return $items;
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}
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/**
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* This function is used to store errors that occur when
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* sending an ActivityPub message to a Follower.
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*
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* The error will be stored in the
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* post meta.
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*
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* @param int $post_id The ID of the WordPress Custom-Post-Type.
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* @param mixed $error The error message. Can be a string or a WP_Error.
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*
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* @return int|false The meta ID on success, false on failure.
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*/
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public static function add_error( $post_id, $error ) {
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if ( is_string( $error ) ) {
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$error_message = $error;
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} elseif ( is_wp_error( $error ) ) {
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$error_message = $error->get_error_message();
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} else {
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$error_message = __(
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'Unknown Error or misconfigured Error-Message',
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'activitypub'
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);
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}
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return add_post_meta(
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$post_id,
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'activitypub_errors',
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$error_message
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);
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}
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}
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