Readarr/src/Readarr.Http/Frontend/CacheableSpecification.cs

using System;
using Nancy;
using NzbDrone.Common.EnvironmentInfo;
using NzbDrone.Common.Extensions;

namespace Readarr.Http.Frontend
{
    public interface ICacheableSpecification
    {
        bool IsCacheable(NancyContext context);
    }

    public class CacheableSpecification : ICacheableSpecification
    {
        public bool IsCacheable(NancyContext context)
        {
            if (!RuntimeInfo.IsProduction)
            {
                return false;
            }

            if (((DynamicDictionary)context.Request.Query).ContainsKey("h"))
            {
                return true;
            }

            if (context.Request.Path.StartsWith("/api", StringComparison.CurrentCultureIgnoreCase))
            {
                if (context.Request.Path.ContainsIgnoreCase("/MediaCover"))
                {
                    return true;
                }

                return false;
            }

            if (context.Request.Path.StartsWith("/signalr", StringComparison.CurrentCultureIgnoreCase))
            {
                return false;
            }

            if (context.Request.Path.EndsWith("index.js"))
            {
                return false;
            }

            if (context.Request.Path.EndsWith("initialize.js"))
            {
                return false;
            }

            if (context.Request.Path.StartsWith("/feed", StringComparison.CurrentCultureIgnoreCase))
            {
                return false;
            }

            if (context.Request.Path.StartsWith("/log", StringComparison.CurrentCultureIgnoreCase) &&
                context.Request.Path.EndsWith(".txt", StringComparison.CurrentCultureIgnoreCase))
            {
                return false;
            }

            if (context.Response != null)
            {
                if (context.Response.ContentType.Contains("text/html"))
                {
                    return false;
                }
            }

            return true;
        }
    }
}