WP_REST_Font_Families_Controller::validate_font_family_settings( string $value, WP_REST_Request $request ): true|WP_Error

89	public function validate_font_family_settings( $value, $request ) {90		// Enforce JSON Schema validity for field before applying custom validation logic.91		$args     = $this->get_endpoint_args_for_item_schema( $request->get_method() );92		$validity = rest_validate_value_from_schema( $value, $args['font_family_settings'], 'font_family_settings' );93 94		if ( is_wp_error( $validity ) ) {95			return $validity;96		}97 98		$settings = json_decode( $value, true );99 100		// Check settings string is valid JSON.101		if ( null === $settings ) {102			return new WP_Error(103				'rest_invalid_param',104				/* translators: %s: Parameter name: "font_family_settings". */105				sprintf( __( '%s parameter must be a valid JSON string.' ), 'font_family_settings' ),106				array( 'status' => 400 )107			);108		}109 110		$schema   = $this->get_item_schema()['properties']['font_family_settings'];111		$required = $schema['required'];112 113		if ( isset( $request['id'] ) ) {114			// Allow sending individual properties if we are updating an existing font family.115			unset( $schema['required'] );116 117			// But don't allow updating the slug, since it is used as a unique identifier.118			if ( isset( $settings['slug'] ) ) {119				return new WP_Error(120					'rest_invalid_param',121					/* translators: %s: Name of parameter being updated: font_family_settings[slug]". */122					sprintf( __( '%s cannot be updated.' ), 'font_family_settings[slug]' ),123					array( 'status' => 400 )124				);125			}126		}127 128		// Check that the font face settings match the theme.json schema.129		$has_valid_settings = rest_validate_value_from_schema( $settings, $schema, 'font_family_settings' );130 131		if ( is_wp_error( $has_valid_settings ) ) {132			$has_valid_settings->add_data( array( 'status' => 400 ) );133			return $has_valid_settings;134		}135 136		// Check that none of the required settings are empty values.137		foreach ( $required as $key ) {138			if ( isset( $settings[ $key ] ) && ! $settings[ $key ] ) {139				return new WP_Error(140					'rest_invalid_param',141					/* translators: %s: Name of the empty font family setting parameter, e.g. "font_family_settings[slug]". */142					sprintf( __( '%s cannot be empty.' ), "font_family_settings[ $key ]" ),143					array( 'status' => 400 )144				);145			}146		}147 148		return true;149	}