406 lines
9.9 KiB
PHP
406 lines
9.9 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_Term_Query;
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use Activitypub\Http;
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use Activitypub\Webfinger;
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use Activitypub\Model\Activity;
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use Activitypub\Model\Follower;
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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 Matthias Pfefferle
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*/
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class Followers {
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const TAXONOMY = 'activitypub-followers';
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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" taxonomy
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self::register_taxonomy();
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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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public static function register_taxonomy() {
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$args = array(
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'labels' => array(
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'name' => _x( 'Followers', 'taxonomy general name', 'activitypub' ),
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'singular_name' => _x( 'Followers', 'taxonomy singular name', 'activitypub' ),
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'menu_name' => __( 'Followers', 'activitypub' ),
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),
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'hierarchical' => false,
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'show_ui' => false,
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'show_in_menu' => false,
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'show_in_nav_menus' => false,
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'show_admin_column' => false,
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'query_var' => false,
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'rewrite' => false,
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'public' => false,
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'capabilities' => array(
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'edit_terms' => null,
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),
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);
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register_taxonomy( self::TAXONOMY, 'user', $args );
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register_taxonomy_for_object_type( self::TAXONOMY, 'user' );
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register_term_meta(
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self::TAXONOMY,
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'name',
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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_user( $value );
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},
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)
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);
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register_term_meta(
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self::TAXONOMY,
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'username',
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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_user( $value, true );
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},
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)
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);
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register_term_meta(
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self::TAXONOMY,
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'avatar',
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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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if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
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return '';
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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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);
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register_term_meta(
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self::TAXONOMY,
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'inbox',
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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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if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
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throw new Exception( '"inbox" has to be a valid URL' );
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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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);
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register_term_meta(
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self::TAXONOMY,
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'shared_inbox',
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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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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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);
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register_term_meta(
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self::TAXONOMY,
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'updated_at',
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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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if ( ! is_numeric( $value ) && (int) $value !== $value ) {
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$value = strtotime( 'now' );
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}
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return $value;
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},
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)
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);
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register_term_meta(
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self::TAXONOMY,
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'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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do_action( 'activitypub_after_register_taxonomy' );
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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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* Handles "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 a 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 ( empty( $meta ) || ! is_array( $meta ) || is_wp_error( $meta ) ) {
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return $meta;
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}
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$follower = new Follower( $actor );
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$follower->upsert();
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$result = wp_set_object_terms( $user_id, $follower->get_actor(), self::TAXONOMY, true );
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if ( is_wp_error( $result ) ) {
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return $result;
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} else {
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return $follower;
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}
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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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return wp_remove_object_terms( $user_id, $actor, self::TAXONOMY );
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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 \Activitypub\Model\Follower The Follower object
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*/
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public static function get_follower( $user_id, $actor ) {
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$terms = new WP_Term_Query(
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array(
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'name' => $actor,
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'taxonomy' => self::TAXONOMY,
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'hide_empty' => false,
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'object_ids' => $user_id,
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'number' => 1,
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)
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);
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$term = $terms->get_terms();
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if ( is_array( $term ) && ! empty( $term ) ) {
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$term = reset( $term );
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return new Follower( $term->name );
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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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unset( $object['@context'] );
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}
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// get inbox
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$inbox = $follower->get_inbox();
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// send "Accept" activity
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$activity = new Activity( 'Accept' );
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$activity->set_object( $object );
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$activity->set_actor( \get_author_posts_url( $user_id ) );
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$activity->set_to( $actor );
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$activity->set_id( \get_author_posts_url( $user_id ) . '#follow-' . \preg_replace( '~^https?://~', '', $actor ) );
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$activity = $activity->to_simple_json();
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$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, $output = ARRAY_N, $number = null, $offset = null, $args = array() ) {
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$defaults = array(
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'taxonomy' => self::TAXONOMY,
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'hide_empty' => false,
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'object_ids' => $user_id,
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'number' => $number,
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'offset' => $offset,
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'orderby' => 'id',
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'order' => 'ASC',
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);
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$args = wp_parse_args( $args, $defaults );
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$terms = new WP_Term_Query( $args );
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$items = array();
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// change output format
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switch ( $output ) {
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case ACTIVITYPUB_OBJECT:
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foreach ( $terms->get_terms() as $follower ) {
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$items[] = new Follower( $follower->name ); // phpcs:ignore
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}
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return $items;
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case OBJECT:
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return $terms->get_terms();
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case ARRAY_N:
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default:
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foreach ( $terms->get_terms() as $follower ) {
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$items[] = $follower->name; // phpcs:ignore
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}
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return $items;
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}
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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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return count( self::get_followers( $user_id ) );
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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( $user_id ) {
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// get all Followers of a ID of the WordPress User
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$terms = new WP_Term_Query(
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array(
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'taxonomy' => self::TAXONOMY,
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'hide_empty' => false,
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'object_ids' => $user_id,
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'fields' => 'ids',
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'meta_query' => array(
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array(
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'key' => 'inbox',
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'compare' => 'EXISTS',
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),
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),
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)
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);
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$terms = $terms->get_terms();
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if ( ! $terms ) {
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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->termmeta}
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WHERE term_id IN (" . implode( ', ', array_fill( 0, count( $terms ), '%d' ) ) . ")
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AND meta_key = 'shared_inbox'
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AND meta_value IS NOT NULL",
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$terms
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)
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);
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return array_filter( $results );
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}
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}
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