URL Validation

import 'package:luthor/luthor.dart';

void main() {
  final validator = l.string().url();
  print(validator.validateValue('https://dart.dev')); // Success
  print(validator.validateValue('not a url')); // Error

  // With allowed schemes
  final httpsOnly = l.string().url(allowedSchemes: ['https']);
  print(httpsOnly.validateValue('https://dart.dev')); // Success
  print(httpsOnly.validateValue('http://dart.dev')); // Error
}

import 'package:luthor/luthor.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'url_schema.freezed.dart';
part 'url_schema.g.dart';

@luthor
@freezed
abstract class UrlSchema with _$UrlSchema {
  const factory UrlSchema({
    @isUrl /* OR @IsUrl() */ required String url,
    @IsUrl(allowedSchemes: ['https']) required String secureUrl,
  }) = _UrlSchema;

  factory UrlSchema.fromJson(Map<String, dynamic> json) =>
      _$UrlSchemaFromJson(json);
}

void main() {
  final result1 = $UrlSchemaValidate({
    'url': 'https://dart.dev',
    'secureUrl': 'https://dart.dev',
  });

  final result2 = $UrlSchemaValidate({
    'url': 'not a url',
    'secureUrl': 'http://dart.dev',
  });

  switch (result1) {
    case SchemaValidationSuccess(data: final data):
      print('✅ Success: ${data.url}');
    case SchemaValidationError(errors: final errors):
      print('❌ Error: $errors');
  }

  switch (result2) {
    case SchemaValidationSuccess():
      print('Unexpected success');
    case SchemaValidationError(errors: final errors):
      print('❌ Error as expected: $errors');
  }
}

The URL validator ensures that a string is a valid URL with a scheme and host. By default, it accepts any valid URL scheme, but you can restrict allowed schemes using the allowedSchemes parameter.

A URL is considered valid if:

• It has a valid scheme (e.g., ‘http’, ‘https’, ‘ftp’, etc.)
• It has a valid host
• It contains no whitespace characters
• The scheme matches one of the allowedSchemes if specified

You can also provide a custom error message:

l.string().url(message: 'Please enter a valid website URL');