wordpress-activitypub/includes/collection/class-followers.php

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<?php
namespace Activitypub\Collection;
use WP_Error;
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use Exception;
use WP_Term_Query;
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use Activitypub\Http;
use Activitypub\Webfinger;
use Activitypub\Model\Activity;
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use Activitypub\Model\Follower;
use function Activitypub\safe_remote_get;
use function Activitypub\safe_remote_post;
use function Activitypub\get_remote_metadata_by_actor;
/**
* ActivityPub Followers Collection
*
* @author Matthias Pfefferle
*/
class Followers {
const TAXONOMY = 'activitypub-followers';
/**
* Register WordPress hooks/actions and register Taxonomy
*
* @return void
*/
public static function init() {
// register "followers" taxonomy
self::register_taxonomy();
\add_action( 'activitypub_inbox_follow', array( self::class, 'handle_follow_request' ), 10, 2 );
\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 );
}
/**
* Register the "Followers" Taxonomy
*
* @return void
*/
public static function register_taxonomy() {
$args = array(
'labels' => array(
'name' => _x( 'Followers', 'taxonomy general name', 'activitypub' ),
'singular_name' => _x( 'Followers', 'taxonomy singular name', 'activitypub' ),
'menu_name' => __( 'Followers', 'activitypub' ),
),
'hierarchical' => false,
'show_ui' => false,
'show_in_menu' => false,
'show_in_nav_menus' => false,
'show_admin_column' => false,
'query_var' => false,
'rewrite' => false,
'public' => false,
'capabilities' => array(
'edit_terms' => null,
),
);
register_taxonomy( self::TAXONOMY, 'user', $args );
register_taxonomy_for_object_type( self::TAXONOMY, 'user' );
register_term_meta(
self::TAXONOMY,
'name',
array(
'type' => 'string',
'single' => true,
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'sanitize_callback' => function( $value ) {
return sanitize_user( $value );
},
)
);
register_term_meta(
self::TAXONOMY,
'username',
array(
'type' => 'string',
'single' => true,
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'sanitize_callback' => function( $value ) {
return sanitize_user( $value, true );
},
)
);
register_term_meta(
self::TAXONOMY,
'avatar',
array(
'type' => 'string',
'single' => true,
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'sanitize_callback' => function( $value ) {
if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
return '';
}
return esc_url_raw( $value );
},
)
);
register_term_meta(
self::TAXONOMY,
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'inbox',
array(
'type' => 'string',
'single' => true,
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'sanitize_callback' => function( $value ) {
if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
throw new Exception( '"inbox" has to be a valid URL' );
}
return esc_url_raw( $value );
},
)
);
register_term_meta(
self::TAXONOMY,
'shared_inbox',
array(
'type' => 'string',
'single' => true,
'sanitize_callback' => function( $value ) {
if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
return null;
}
return esc_url_raw( $value );
},
)
);
register_term_meta(
self::TAXONOMY,
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'updated_at',
array(
'type' => 'string',
'single' => true,
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'sanitize_callback' => function( $value ) {
if ( ! is_numeric( $value ) && (int) $value !== $value ) {
$value = strtotime( 'now' );
}
return $value;
},
)
);
do_action( 'activitypub_after_register_taxonomy' );
}
/**
* Handle the "Follow" Request
*
* @param array $object The JSON "Follow" Activity
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* @param int $user_id The ID of the ID of the WordPress User
*
* @return void
*/
public static function handle_follow_request( $object, $user_id ) {
// save follower
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$follower = self::add_follower( $user_id, $object['actor'] );
do_action( 'activitypub_followers_post_follow', $object['actor'], $object, $user_id, $follower );
}
/**
* Handles "Unfollow" requests
*
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* @param array $object The JSON "Undo" Activity
* @param int $user_id The ID of the ID of the WordPress User
*/
public static function handle_undo_request( $object, $user_id ) {
if (
isset( $object['object'] ) &&
isset( $object['object']['type'] ) &&
'Follow' === $object['object']['type']
) {
self::remove_follower( $user_id, $object['actor'] );
}
}
/**
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* Add a new Follower
*
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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
*/
public static function add_follower( $user_id, $actor ) {
$meta = get_remote_metadata_by_actor( $actor );
if ( ! $meta || is_wp_error( $meta ) || ! is_array( $meta ) ) {
return $meta;
}
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$follower = new Follower( $actor );
$follower->from_meta( $meta );
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$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 ) ) {
return $result;
} else {
return $follower;
}
}
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/**
* Remove a Follower
*
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* @param int $user_id The ID of the WordPress User
* @param string $actor The Actor URL
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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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* @param int $user_id The ID of the WordPress User
* @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 ) {
$terms = new WP_Term_Query(
array(
'name' => $actor,
'taxonomy' => self::TAXONOMY,
'hide_empty' => false,
'object_ids' => $user_id,
'number' => 1,
)
);
$term = $terms->get_terms();
if ( is_array( $term ) && ! empty( $term ) ) {
$term = reset( $term );
return new Follower( $term->name );
}
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return null;
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}
/**
* Send Accept response
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*
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* @param string $actor The Actor URL
* @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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public static function send_follow_response( $actor, $object, $user_id, $follower ) {
//if ( is_wp_error( $follower ) ) {
// @todo send error message
//}
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if ( isset( $object['user_id'] ) ) {
unset( $object['user_id'] );
unset( $object['@context'] );
}
// get inbox
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$inbox = $follower->get_inbox();
// send "Accept" activity
$activity = new Activity( 'Accept' );
$activity->set_object( $object );
$activity->set_actor( \get_author_posts_url( $user_id ) );
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$activity->set_to( $actor );
$activity->set_id( \get_author_posts_url( $user_id ) . '#follow-' . \preg_replace( '~^https?://~', '', $actor ) );
$activity = $activity->to_simple_json();
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$response = Http::post( $inbox, $activity, $user_id );
}
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/**
* Get the Followers of a given user
*
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* @param int $user_id The ID of the WordPress User
* @param string $output The output format, supported ARRAY_N, OBJECT and ACTIVITYPUB_OBJECT
* @param int $number Limts the result
* @param int $offset Offset
*
* @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 ) {
$terms = new WP_Term_Query(
array(
'taxonomy' => self::TAXONOMY,
'hide_empty' => false,
'object_ids' => $user_id,
'number' => $number,
'offset' => $offset,
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'orderby' => 'id',
'order' => 'ASC',
)
);
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$items = array();
// change output format
switch ( $output ) {
case ACTIVITYPUB_OBJECT:
foreach ( $terms->get_terms() as $follower ) {
$items[] = new Follower( $follower->name ); // phpcs:ignore
}
return $items;
case OBJECT:
return $terms->get_terms();
case ARRAY_N:
default:
foreach ( $terms->get_terms() as $follower ) {
$items[] = $follower->name; // phpcs:ignore
}
return $items;
}
}
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/**
* Count the total number of followers
*
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* @param int $user_id The ID of the WordPress User
*
* @return int The number of Followers
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*/
public static function count_followers( $user_id ) {
return count( self::get_followers( $user_id ) );
}
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/**
* Returns all Inboxes fo a Users Followers
*
* @param int $user_id The ID of the WordPress User
*
* @return array The list of Inboxes
*/
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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(
array(
'taxonomy' => self::TAXONOMY,
'hide_empty' => false,
'object_ids' => $user_id,
'fields' => 'ids',
)
);
$terms = $terms->get_terms();
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if ( ! $terms ) {
return array();
}
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global $wpdb;
$results = $wpdb->get_col(
$wpdb->prepare(
"SELECT DISTINCT meta_value FROM {$wpdb->termmeta}
WHERE term_id IN (" . implode( ', ', array_fill( 0, count( $terms ), '%d' ) ) . ")
AND meta_key = 'shared_inbox'
AND meta_value IS NOT NULL",
$terms
)
);
return array_filter( $results );
}
}