RAGECOOP-V/Core/Networking/HttpHelper.cs

using System;
using System.IO;
using System.Net;
using System.Threading;

namespace RageCoop.Core
{
    internal static class HttpHelper
    {
        public static void DownloadFile(string url, string destination, Action<int> progressCallback = null)
        {
            if (File.Exists(destination)) File.Delete(destination);
            var ae = new AutoResetEvent(false);
            var client = new WebClient();

            // TLS only
            ServicePointManager.Expect100Continue = true;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
            ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

            client.DownloadProgressChanged += (s, e1) => progressCallback?.Invoke(e1.ProgressPercentage);
            client.DownloadFileCompleted += (s, e2) => { ae.Set(); };
            client.DownloadFileAsync(new Uri(url), destination);
            ae.WaitOne();
        }

        public static string DownloadString(string url)
        {
            // TLS only
            ServicePointManager.Expect100Continue = true;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 |
                                                   SecurityProtocolType.Tls11 |
                                                   SecurityProtocolType.Tls;
            ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

            var client = new WebClient();
            return client.DownloadString(url);
        }
    }
}