fix sticky posts endpoint

includes/rest/class-collection.php

@@ -5,8 +5,10 @@ use WP_REST_Server;
 use WP_REST_Response;
 use Activitypub\Transformer\Post;
 use Activitypub\Activity\Activity;
+use Activitypub\Collection\Users as User_Collection;
 
 use function Activitypub\esc_hashtag;
+use function Activitypub\is_single_user;
 use function Activitypub\get_rest_url_by_path;
 
 /**
@@ -65,7 +67,13 @@ class Collection {
 	 */
 	public static function tags_get( $request ) {
 		$user_id = $request->get_param( 'user_id' );
-		$number  = 4;
+		$user    = User_Collection::get_by_various( $user_id );
+
+		if ( is_wp_error( $user ) ) {
+			return $user;
+		}
+
+		$number = 4;
 
 		$tags = \get_terms(
 			array(
@@ -82,7 +90,7 @@ class Collection {
 
 		$response = array(
 			'@context'   => Activity::CONTEXT,
-			'id'         => get_rest_url_by_path( sprintf( 'users/%d/collections/tags', $user_id ) ),
+			'id'         => get_rest_url_by_path( sprintf( 'users/%d/collections/tags', $user->get__id() ) ),
 			'type'       => 'Collection',
 			'totalItems' => count( $tags ),
 			'items'      => array(),
@@ -108,17 +116,32 @@ class Collection {
 	 */
 	public static function featured_get( $request ) {
 		$user_id = $request->get_param( 'user_id' );
+		$user    = User_Collection::get_by_various( $user_id );
 
-		$args = array(
-			'post__in'            => \get_option( 'sticky_posts' ),
-			'ignore_sticky_posts' => 1,
-		);
-
-		if ( $user_id > 0 ) {
-			$args['author'] = $user_id;
+		if ( is_wp_error( $user ) ) {
+			return $user;
 		}
 
-		$posts = \get_posts( $args );
+		$sticky_posts = \get_option( 'sticky_posts' );
+
+		if ( ! is_single_user() && User_Collection::BLOG_USER_ID === $user->get__id() ) {
+			$posts = array();
+		} elseif ( $sticky_posts ) {
+			$args = array(
+				'post__in'            => $sticky_posts,
+				'ignore_sticky_posts' => 1,
+				'orderby'             => 'date',
+				'order'               => 'DESC',
+			);
+
+			if ( $user->get__id() > 0 ) {
+				$args['author'] = $user->get__id();
+			}
+
+			$posts = \get_posts( $args );
+		} else {
+			$posts = array();
+		}
 
 		$response = array(
 			'@context'     => Activity::CONTEXT,