Radarr/NzbDrone.Core/Validation/RuleBuilderExtensions.cs

using System.Text.RegularExpressions;
using FluentValidation;
using FluentValidation.Validators;

namespace NzbDrone.Core.Validation
{
    public static class RuleBuilderExtensions
    {
        public static IRuleBuilderOptions<T, int> ValidId<T>(this IRuleBuilder<T, int> ruleBuilder)
        {
            return ruleBuilder.SetValidator(new GreaterThanValidator(0));
        }

        public static IRuleBuilderOptions<T, int> IsZero<T>(this IRuleBuilder<T, int> ruleBuilder)
        {
            return ruleBuilder.SetValidator(new EqualValidator(0));
        }

        public static IRuleBuilderOptions<T, string> HaveHttpProtocol<T>(this IRuleBuilder<T, string> ruleBuilder)
        {
            return ruleBuilder.SetValidator(new RegularExpressionValidator("^http(s)?://", RegexOptions.IgnoreCase)).WithMessage("must start with http:// or https://");
        }

        public static IRuleBuilderOptions<T, string> ValidRootUrl<T>(this IRuleBuilder<T, string> ruleBuilder)
        {
            ruleBuilder.SetValidator(new NotEmptyValidator(null));
            return ruleBuilder.SetValidator(new RegularExpressionValidator("^http(?:s)?://[a-z0-9-.]+", RegexOptions.IgnoreCase)).WithMessage("must be valid URL that");
        }
    }
}