<?php
namespace Activitypub\Collection;
use WP_Error;
use WP_Query;
use Activitypub\Http;
use Activitypub\Webfinger;
use Activitypub\Model\Follower;
use function Activitypub\is_tombstone;
use function Activitypub\get_remote_metadata_by_actor;
/**
* ActivityPub Followers Collection
*
* @author Matt Wiebe
* @author Matthias Pfefferle
*/
class Followers {
const POST_TYPE = 'ap_follower';
const CACHE_KEY_INBOXES = 'follower_inboxes_%s';
/**
* Add new Follower
*
* @param int $user_id The ID of the WordPress User
* @param string $actor The Actor URL
*
* @return array|WP_Error The Follower (WP_Post array) or an WP_Error
*/
public static function add_follower( $user_id, $actor ) {
$meta = get_remote_metadata_by_actor( $actor );
if ( is_tombstone( $meta ) ) {
return $meta;
}
if ( empty( $meta ) || ! is_array( $meta ) || is_wp_error( $meta ) ) {
return new WP_Error( 'activitypub_invalid_follower', __( 'Invalid Follower', 'activitypub' ), array( 'status' => 400 ) );
}
$follower = new Follower();
$follower->from_array( $meta );
$id = $follower->upsert();
if ( is_wp_error( $id ) ) {
return $id;
}
$post_meta = get_post_meta( $id, 'activitypub_user_id' );
// phpcs:ignore WordPress.PHP.StrictInArray.MissingTrueStrict
if ( is_array( $post_meta ) && ! in_array( $user_id, $post_meta ) ) {
add_post_meta( $id, 'activitypub_user_id', $user_id );
wp_cache_delete( sprintf( self::CACHE_KEY_INBOXES, $user_id ), 'activitypub' );
}
return $follower;
}
/**
* Remove a Follower
*
* @param int $user_id The ID of the WordPress User
* @param string $actor The Actor URL
*
* @return bool|WP_Error True on success, false or WP_Error on failure.
*/
public static function remove_follower( $user_id, $actor ) {
wp_cache_delete( sprintf( self::CACHE_KEY_INBOXES, $user_id ), 'activitypub' );
$follower = self::get_follower( $user_id, $actor );
if ( ! $follower ) {
return false;
}
return delete_post_meta( $follower->get__id(), 'activitypub_user_id', $user_id );
}
/**
* Get a Follower.
*
* @param int $user_id The ID of the WordPress User
* @param string $actor The Actor URL
*
* @return \Activitypub\Model\Follower|null The Follower object or null
*/
public static function get_follower( $user_id, $actor ) {
global $wpdb;
// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
$post_id = $wpdb->get_var(
$wpdb->prepare(
"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",
array(
esc_sql( self::POST_TYPE ),
esc_sql( $user_id ),
esc_sql( $actor ),
)
)
);
if ( $post_id ) {
$post = get_post( $post_id );
return Follower::init_from_cpt( $post );
}
return null;
}
/**
* Get a Follower by Actor indepenent from the User.
*
* @param string $actor The Actor URL.
*
* @return \Activitypub\Model\Follower|null The Follower object or null
*/
public static function get_follower_by_actor( $actor ) {
global $wpdb;
// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
$post_id = $wpdb->get_var(
$wpdb->prepare(
"SELECT ID FROM $wpdb->posts WHERE guid=%s",
esc_sql( $actor )
)
);
if ( $post_id ) {
$post = get_post( $post_id );
return Follower::init_from_cpt( $post );
}
return null;
}
/**
* Get the Followers of a given user
*
* @param int $user_id The ID of the WordPress User.
* @param int $number Maximum number of results to return.
* @param int $page Page number.
* @param array $args The WP_Query arguments.
* @return array List of `Follower` objects.
*/
public static function get_followers( $user_id, $number = -1, $page = null, $args = array() ) {
$data = self::get_followers_with_count( $user_id, $number, $page, $args );
return $data['followers'];
}
/**
* Get the Followers of a given user, along with a total count for pagination purposes.
*
* @param int $user_id The ID of the WordPress User.
* @param int $number Maximum number of results to return.
* @param int $page Page number.
* @param array $args The WP_Query arguments.
*
* @return array
* followers List of `Follower` objects.
* total Total number of followers.
*/
public static function get_followers_with_count( $user_id, $number = -1, $page = null, $args = array() ) {
$defaults = array(
'post_type' => self::POST_TYPE,
'posts_per_page' => $number,
'paged' => $page,
'orderby' => 'ID',
'order' => 'DESC',
// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
'meta_query' => array(
array(
'key' => 'activitypub_user_id',
'value' => $user_id,
),
),
);
$args = wp_parse_args( $args, $defaults );
$query = new WP_Query( $args );
$total = $query->found_posts;
$followers = array_map(
function( $post ) {
return Follower::init_from_cpt( $post );
},
$query->get_posts()
);
return compact( 'followers', 'total' );
}
/**
* Get all Followers
*
* @param array $args The WP_Query arguments.
*
* @return array The Term list of Followers.
*/
public static function get_all_followers() {
$args = array(
// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
'meta_query' => array(
'relation' => 'AND',
array(
'key' => 'activitypub_inbox',
'compare' => 'EXISTS',
),
array(
'key' => 'activitypub_actor_json',
'compare' => 'EXISTS',
),
),
);
return self::get_followers( null, null, null, $args );
}
/**
* Count the total number of followers
*
* @param int $user_id The ID of the WordPress User
*
* @return int The number of Followers
*/
public static function count_followers( $user_id ) {
$query = new WP_Query(
array(
'post_type' => self::POST_TYPE,
'fields' => 'ids',
// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
'meta_query' => array(
'relation' => 'AND',
array(
'key' => 'activitypub_user_id',
'value' => $user_id,
),
array(
'key' => 'activitypub_inbox',
'compare' => 'EXISTS',
),
array(
'key' => 'activitypub_actor_json',
'compare' => 'EXISTS',
),
),
)
);
return $query->found_posts;
}
/**
* Returns all Inboxes fo a Users Followers
*
* @param int $user_id The ID of the WordPress User
*
* @return array The list of Inboxes
*/
public static function get_inboxes( $user_id ) {
$cache_key = sprintf( self::CACHE_KEY_INBOXES, $user_id );
$inboxes = wp_cache_get( $cache_key, 'activitypub' );
if ( $inboxes ) {
return $inboxes;
}
// get all Followers of a ID of the WordPress User
$posts = new WP_Query(
array(
'post_type' => self::POST_TYPE,
'fields' => 'ids',
// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
'meta_query' => array(
'relation' => 'AND',
array(
'key' => 'activitypub_inbox',
'compare' => 'EXISTS',
),
array(
'key' => 'activitypub_user_id',
'value' => $user_id,
),
array(
'key' => 'activitypub_inbox',
'value' => '',
'compare' => '!=',
),
),
)
);
$posts = $posts->get_posts();
if ( ! $posts ) {
return array();
}
global $wpdb;
// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery
$results = $wpdb->get_col(
$wpdb->prepare(
"SELECT DISTINCT meta_value FROM {$wpdb->postmeta}
WHERE post_id IN (" . implode( ', ', array_fill( 0, count( $posts ), '%d' ) ) . ")
AND meta_key = 'activitypub_inbox'
AND meta_value IS NOT NULL",
$posts
)
);
$inboxes = array_filter( $results );
wp_cache_set( $cache_key, $inboxes, 'activitypub' );
return $inboxes;
}
/**
* Get all Followers that have not been updated for a given time
*
* @param enum $output The output format, supported ARRAY_N, OBJECT and ACTIVITYPUB_OBJECT.
* @param int $number Limits the result.
* @param int $older_than The time in seconds.
*
* @return mixed The Term list of Followers, the format depends on $output.
*/
public static function get_outdated_followers( $number = 50, $older_than = 86400 ) {
$args = array(
'post_type' => self::POST_TYPE,
'posts_per_page' => $number,
'orderby' => 'modified',
'order' => 'ASC',
'post_status' => 'any', // 'any' includes 'trash
'date_query' => array(
array(
'column' => 'post_modified_gmt',
'before' => gmdate( 'Y-m-d', \time() - $older_than ),
),
),
);
$posts = new WP_Query( $args );
$items = array();
foreach ( $posts->get_posts() as $follower ) {
$items[] = Follower::init_from_cpt( $follower ); // phpcs:ignore
}
return $items;
}
/**
* Get all Followers that had errors
*
* @param enum $output The output format, supported ARRAY_N, OBJECT and ACTIVITYPUB_OBJECT
* @param integer $number The number of Followers to return.
*
* @return mixed The Term list of Followers, the format depends on $output.
*/
public static function get_faulty_followers( $number = 20 ) {
$args = array(
'post_type' => self::POST_TYPE,
'posts_per_page' => $number,
// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
'meta_query' => array(
'relation' => 'OR',
array(
'key' => 'activitypub_errors',
'compare' => 'EXISTS',
),
array(
'key' => 'activitypub_inbox',
'compare' => 'NOT EXISTS',
),
array(
'key' => 'activitypub_actor_json',
'compare' => 'NOT EXISTS',
),
array(
'key' => 'activitypub_inbox',
'value' => '',
'compare' => '=',
),
array(
'key' => 'activitypub_actor_json',
'value' => '',
'compare' => '=',
),
),
);
$posts = new WP_Query( $args );
$items = array();
foreach ( $posts->get_posts() as $follower ) {
$items[] = Follower::init_from_cpt( $follower ); // phpcs:ignore
}
return $items;
}
/**
* This function is used to store errors that occur when
* sending an ActivityPub message to a Follower.
*
* The error will be stored in the
* post meta.
*
* @param int $post_id The ID of the WordPress Custom-Post-Type.
* @param mixed $error The error message. Can be a string or a WP_Error.
*
* @return int|false The meta ID on success, false on failure.
*/
public static function add_error( $post_id, $error ) {
if ( is_string( $error ) ) {
$error_message = $error;
} elseif ( is_wp_error( $error ) ) {
$error_message = $error->get_error_message();
} else {
$error_message = __(
'Unknown Error or misconfigured Error-Message',
'activitypub'
);
}
return add_post_meta(
$post_id,
'activitypub_errors',
$error_message
);
}
}