s if a given request has access to read a single theme global styles config.
	 *
	 * @since 5.9.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has read access for the item, WP_Error object otherwise.
	 */
	public function get_theme_item_permissions_check( $request ) {
		/*
		 * Verify if the current user has edit_theme_options capability.
		 * This capability is required to edit/view/delete templates.
		 */
		if ( ! current_user_can( 'edit_theme_options' ) ) {
			return new WP_Error(
				'rest_cannot_manage_global_styles',
				__( 'Sorry, you are not allowed to access the global styles on this site.' ),
				array(
					'status' => rest_authorization_required_code(),
				)
			);
		}

		return true;
	}

	/**
	 * Returns the given theme global styles config.
	 *
	 * @since 5.9.0
	 *
	 * @param WP_REST_Request $request The request instance.
	 * @return WP_REST_Response|WP_Error
	 */
	public function get_theme_item( $request ) {
		if ( get_stylesheet() !== $request['stylesheet'] ) {
			// This endpoint only supports the active theme for now.
			return new WP_Error(
				'rest_theme_not_found',
				__( 'Theme not found.' ),
				array( 'status' => 404 )
			);
		}

		$theme  = WP_Theme_JSON_Resolver::get_merged_data( 'theme' );
		$data   = array();
		$fields = $this->get_fields_for_response( $request );

		if ( rest_is_field_included( 'settings', $fields ) ) {
			$data['settings'] = $theme->get_settings();
		}

		if ( rest_is_field_included( 'styles', $fields ) ) {
			$raw_data       = $theme->get_raw_data();
			$data['styles'] = isset( $raw_data['styles'] ) ? $raw_data['styles'] : array();
		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->add_additional_fields_to_object( $data, $request );
		$data    = $this->filter_response_by_context( $data, $context );

		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
			$links = array(
				'self' => array(
					'href' => rest_url( sprintf( '%s/%s/themes/%s', $this->namespace, $this->rest_base, $request['stylesheet'] ) ),
				),
			);
			$response->add_links( $links );
		}

		return $response;
	}

	/**
	 * Checks if a given request has access to read a single theme global styles config.
	 *
	 * @since 6.0.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has read access for the item, WP_Error object otherwise.
	 */
	public function get_theme_items_permissions_check( $request ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		/*
		 * Verify if the current user has edit_theme_options capability.
		 * This capability is required to edit/view/delete templates.
		 */
		if ( ! current_user_can( 'edit_theme_options' ) ) {
			return new WP_Error(
				'rest_cannot_manage_global_styles',
				__( 'Sorry, you are not allowed to access the global styles on this site.' ),
				array(
					'status' => rest_authorization_required_code(),
				)
			);
		}

		return true;
	}

	/**
	 * Returns the given theme global styles variations.
	 *
	 * @since 6.0.0
	 *
	 * @param WP_REST_Request $request The request instance.
	 *
	 * @return WP_REST_Response|WP_Error
	 */
	public function get_theme_items( $request ) {
		if ( get_stylesheet() !== $request['stylesheet'] ) {
			// This endpoint only supports the active theme for now.
			return new WP_Error(
				'rest_theme_not_found',
				__( 'Theme not found.' ),
				array( 'status' => 404 )
			);
		}

		$variations = WP_Theme_JSON_Resolver::get_style_variations();
		$response   = rest_ensure_response( $variations );

		return $response;
	}

	/**
	 * Validate style.css as valid CSS.
	 *
	 * Currently just checks for invalid markup.
	 *
	 * @since 6.2.0
	 *
	 * @param string $css CSS to validate.
	 * @return true|WP_Error True if the input was validated, otherwise WP_Error.
	 */
	private function validate_custom_css( $css ) {
		if ( preg_match( '#</?\w+#', $css ) ) {
			return new WP_Error(
				'rest_custom_css_illegal_markup',
				__( 'Markup is not allowed in CSS.' ),
				array( 'status' => 400 )
			);
		}
		return true;
	}
}