passes method

@override FutureOr<bool> passes(ValidationContext context)

Validates the value using the given context.

Returns true if valid, otherwise false.

Implementation

@override
FutureOr<bool> passes(ValidationContext context) {
  final value = context.value;
  if (value == null) return false;
  if (value is! String) return false;

  final ipv4Regex = RegExp(
    r'^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}'
    r'(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$',
  );

  final ipv6Regex = RegExp(
    r'^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|'
    r'([0-9a-fA-F]{1,4}:){1,7}:|'
    r'([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|'
    r'([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|'
    r'([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|'
    r'([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|'
    r'([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|'
    r'[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|'
    r':((:[0-9a-fA-F]{1,4}){1,7}|:)|'
    r'fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|'
    r'::(ffff(:0{1,4}){0,1}:){0,1}'
    r'((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}'
    r'(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|'
    r'([0-9a-fA-F]{1,4}:){1,4}:'
    r'((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}'
    r'(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$',
  );

  return ipv4Regex.hasMatch(value) || ipv6Regex.hasMatch(value);
}