REST API: Move all links to prepare_links method in theme REST API co…

…ntroller.

Move logic to generate link to global styles to the `prepare_links` method in theme REST API controller. This way all logic to generate links is within the `prepare_links` method, bringing this controller inline with other REST API controllers.

Props SergeyBiryukov, Spacedmonkey.
Fixes #56018.

git-svn-id: https://develop.svn.wordpress.org/trunk@53544 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rest-api/endpoints/class-wp-rest-themes-controller.php

@@ -333,21 +333,6 @@ public function prepare_item_for_response( $item, $request ) {
 
 		$response->add_links( $this->prepare_links( $theme ) );
 
-		if ( $theme->get_stylesheet() === wp_get_theme()->get_stylesheet() ) {
-			// This creates a record for the active theme if not existent.
-			$id = WP_Theme_JSON_Resolver::get_user_global_styles_post_id();
-		} else {
-			$user_cpt = WP_Theme_JSON_Resolver::get_user_data_from_wp_global_styles( $theme );
-			$id       = isset( $user_cpt['ID'] ) ? $user_cpt['ID'] : null;
-		}
-
-		if ( $id ) {
-			$response->add_link(
-				'https://api.w.org/user-global-styles',
-				rest_url( 'wp/v2/global-styles/' . $id )
-			);
-		}
-
 		/**
 		 * Filters theme data returned from the REST API.
 		 *
@@ -369,14 +354,30 @@ public function prepare_item_for_response( $item, $request ) {
 	 * @return array Links for the given block type.
 	 */
 	protected function prepare_links( $theme ) {
-		return array(
+		$links = array(
 			'self'       => array(
 				'href' => rest_url( sprintf( '%s/%s/%s', $this->namespace, $this->rest_base, $theme->get_stylesheet() ) ),
 			),
 			'collection' => array(
 				'href' => rest_url( sprintf( '%s/%s', $this->namespace, $this->rest_base ) ),
 			),
 		);
+
+		if ( $this->is_same_theme( $theme, wp_get_theme() ) ) {
+			// This creates a record for the active theme if not existent.
+			$id = WP_Theme_JSON_Resolver::get_user_global_styles_post_id();
+		} else {
+			$user_cpt = WP_Theme_JSON_Resolver::get_user_data_from_wp_global_styles( $theme );
+			$id       = isset( $user_cpt['ID'] ) ? $user_cpt['ID'] : null;
+		}
+
+		if ( $id ) {
+			$links['https://api.w.org/user-global-styles'] = array(
+				'href' => rest_url( 'wp/v2/global-styles/' . $id ),
+			);
+		}
+
+		return $links;
 	}
 
 	/**