WireMock.Net-wiremock/src/WireMock.Net/Util/HttpStatusRangeParser.cs

using System;
using System.Linq;
using System.Net;
using System.Text.RegularExpressions;

namespace WireMock.Util
{
    /// <summary>
    /// Based on https://github.com/tmenier/Flurl/blob/129565361e135e639f1d44a35a78aea4302ac6ca/src/Flurl.Http/HttpStatusRangeParser.cs
    /// </summary>
    internal static class HttpStatusRangeParser
    {
        /// <summary>
        /// Determines whether the specified pattern is match.
        /// </summary>
        /// <param name="pattern">The pattern. (Can be null, in that case it's allowed.)</param>
        /// <param name="httpStatusCode">The value.</param>
        /// <exception cref="ArgumentException"><paramref name="pattern"/> is invalid.</exception>
        public static bool IsMatch(string pattern, HttpStatusCode httpStatusCode)
        {
            return IsMatch(pattern, (int)httpStatusCode);
        }

        /// <summary>
        /// Determines whether the specified pattern is match.
        /// </summary>
        /// <param name="pattern">The pattern. (Can be null, in that case it's allowed.)</param>
        /// <param name="httpStatusCode">The value.</param>
        /// <exception cref="ArgumentException"><paramref name="pattern"/> is invalid.</exception>
        public static bool IsMatch(string pattern, int httpStatusCode)
        {
            if (pattern == null)
            {
                return true;
            }

            foreach (var range in pattern.Split(',').Select(p => p.Trim()))
            {
                switch (range)
                {
                    case "":
                        continue;

                    case "*":
                        return true; // special case - allow everything
                }

                string[] bounds = range.Split('-');
                int lower = 0;
                int upper = 0;

                bool valid =
                    bounds.Length <= 2 &&
                    int.TryParse(Regex.Replace(bounds.First().Trim(), "[*xX]", "0"), out lower) &&
                    int.TryParse(Regex.Replace(bounds.Last().Trim(), "[*xX]", "9"), out upper);

                if (!valid)
                {
                    throw new ArgumentException($"Invalid range pattern: \"{pattern}\". Examples of allowed patterns: \"400\", \"4xx\", \"300,400-403\", \"*\".");
                }

                if (httpStatusCode >= lower && httpStatusCode <= upper)
                {
                    return true;
                }
            }

            return false;
        }
    }
}