Jackett-Jackett/src/Jackett.Common/Exceptions/TooManyRequestsException.cs

using System;
using Jackett.Common.Utils.Clients;

namespace Jackett.Common.Exceptions
{
    public class TooManyRequestsException : Exception
    {
        public TimeSpan RetryAfter { get; private set; }

        public TooManyRequestsException(string message, TimeSpan retryWait)
            : base(message) => RetryAfter = retryWait;

        public TooManyRequestsException(string message, WebResult response)
            : base(message)
        {
            if (response.Headers.ContainsKey("Retry-After"))
            {
                var retryAfter = response.Headers["Retry-After"].ToString();

                if (int.TryParse(retryAfter, out var seconds))
                    RetryAfter = TimeSpan.FromSeconds(seconds);
                else if (DateTime.TryParse(retryAfter, out var date))
                    RetryAfter = date.ToUniversalTime() - DateTime.UtcNow;
            }
        }
    }
}