Revert "Fixed: Support for Mono 5.x with the newer BoringTLS provider."

This reverts commit 5b722a3a48.

src/NzbDrone.Common/Security/SecurityProtocolPolicy.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Net;
 using NLog;
-using NzbDrone.Common.EnvironmentInfo;
 using NzbDrone.Common.Instrumentation;
 
 namespace NzbDrone.Common.Security
@@ -15,12 +14,6 @@ namespace NzbDrone.Common.Security
 
         public static void Register()
         {
-            if (OsInfo.IsNotWindows)
-            {
-                // This was never meant to be used on mono, and will cause issues with mono 5 and higher if btls is enabled.
-                return;
-            }
-
             try
             {
                 // TODO: In v3 we should drop support for SSL3 because its very insecure. Only leaving it enabled because some people might rely on it.

src/NzbDrone.Core/HealthCheck/Checks/MonoTlsCheck.cs

@@ -1,69 +0,0 @@
-using System;
-using System.Linq;
-using System.Reflection;
-using NLog;
-using NzbDrone.Common.EnvironmentInfo;
-
-namespace NzbDrone.Core.HealthCheck.Checks
-{
-    public class MonoTlsCheck : HealthCheckBase
-    {
-        private readonly IPlatformInfo _platformInfo;
-        private readonly Logger _logger;
-
-        public MonoTlsCheck(IPlatformInfo platformInfo, Logger logger)
-        {
-            _platformInfo = platformInfo;
-            _logger = logger;
-        }
-
-        public override HealthCheck Check()
-        {
-            if (!PlatformInfo.IsMono)
-            {
-                return new HealthCheck(GetType());
-            }
-
-            var monoVersion = _platformInfo.Version;
-
-            if (monoVersion >= new Version("5.0.0") && Environment.GetEnvironmentVariable("MONO_TLS_PROVIDER") == "legacy")
-            {
-                _logger.Debug("Mono version 5.0.0 or higher and legacy TLS provider is selected, recommending user to switch to btls.");
-                return new HealthCheck(GetType(), HealthCheckResult.Warning, "Sonarr now supports Mono 5.x with btls enabled, consider removing MONO_TLS_PROVIDER=legacy option");
-            }
-
-            return new HealthCheck(GetType());
-        }
-
-        public override bool CheckOnSchedule => false;
-
-        private bool HasMonoBug18599()
-        {
-            _logger.Debug("mono version 3.4.0, checking for mono bug #18599.");
-            var numberFormatterType = Type.GetType("System.NumberFormatter");
-
-            if (numberFormatterType == null)
-            {
-                _logger.Debug("Couldn't find System.NumberFormatter. Aborting test.");
-                return false;
-            }
-
-            var fieldInfo = numberFormatterType.GetField("userFormatProvider",
-                BindingFlags.Static | BindingFlags.NonPublic);
-
-            if (fieldInfo == null)
-            {
-                _logger.Debug("userFormatProvider field not found, version likely preceeds the official v3.4.0.");
-                return false;
-            }
-
-            if (fieldInfo.GetCustomAttributes(false).Any(v => v is ThreadStaticAttribute))
-            {
-                _logger.Debug("userFormatProvider field doesn't contain the ThreadStatic Attribute, version is affected by the critical bug #18599.");
-                return true;
-            }
-
-            return false;
-        }
-    }
-}

src/NzbDrone.Core/NzbDrone.Core.csproj

@@ -619,10 +619,6 @@
     <Compile Include="HealthCheck\CheckHealthCommand.cs" />
     <Compile Include="HealthCheck\Checks\AppDataLocationCheck.cs" />
     <Compile Include="HealthCheck\Checks\DownloadClientCheck.cs" />
-    <Compile Include="HealthCheck\Checks\DownloadClientStatusCheck.cs" />
-    <Compile Include="HealthCheck\Checks\DeprecatedDroneFactoryCheck.cs" />
-    <Compile Include="HealthCheck\Checks\MonoTlsCheck.cs" />
-    <Compile Include="HealthCheck\Checks\MountCheck.cs" />
     <Compile Include="HealthCheck\Checks\DroneFactoryCheck.cs" />
     <Compile Include="HealthCheck\Checks\ImportMechanismCheck.cs" />
     <Compile Include="HealthCheck\Checks\IndexerRssCheck.cs" />