Added check to allow non spec compliant consumers to send us null for…

src/JsonRpc/Reciever.cs

@@ -79,11 +79,18 @@ protected virtual Renor GetRenor(JToken @object)
  }
 
  var hasParams = request.TryGetValue("params", out var @params);
- if (hasParams && @params?.Type != JTokenType.Array && @params?.Type != JTokenType.Object)
+ if (hasParams && @params?.Type != JTokenType.Array && @params?.Type != JTokenType.Object && @params?.Type != JTokenType.Null)
  {
  return new InvalidRequest(requestId, "Invalid params");
  }
 
+ // Special case params such that if we get a null value (from a non spec compliant system)
+ // that we don't fall over and throw an error.
+ if (@params?.Type == JTokenType.Null)
+ {
+ @params = null;
+ }
+
  // id == request
  // !id == notification
  if (!hasRequestId)

src/Protocol/General/IShutdownHandler.cs

@@ -11,5 +11,5 @@ public static partial class GeneralNames
  }
 
  [Serial, Method(Shutdown)]
- public interface IShutdownHandler : INotificationHandler { }
+ public interface IShutdownHandler : IRequestHandler<object> { }
 }

src/Server/Handlers/ShutdownHandler.cs

@@ -1,3 +1,4 @@
+using System.Threading;
 using System.Threading.Tasks;
 using OmniSharp.Extensions.LanguageServer.Protocol;
 using OmniSharp.Extensions.LanguageServer.Server.Abstractions;
@@ -6,19 +7,18 @@ namespace OmniSharp.Extensions.LanguageServer.Server.Handlers
 {
  public class ShutdownHandler : IShutdownHandler, IAwaitableTermination
  {
- public Task Handle()
+ public event ShutdownEventHandler Shutdown;
+
+ public bool ShutdownRequested { get; private set; }
+
+ private readonly TaskCompletionSource<bool> _shutdownSource = new TaskCompletionSource<bool>(TaskContinuationOptions.LongRunning);
+ Task IAwaitableTermination.WasShutDown => _shutdownSource.Task;
+ public Task Handle(object request, CancellationToken token)
  {
  ShutdownRequested = true;
  Shutdown?.Invoke(ShutdownRequested);
- shutdownSource.SetResult(true); // after all event sinks were notified
+ _shutdownSource.SetResult(true); // after all event sinks were notified
  return Task.CompletedTask;
  }
-
- public event ShutdownEventHandler Shutdown;
-
- public bool ShutdownRequested { get; private set; }
-
- private readonly TaskCompletionSource<bool> shutdownSource = new TaskCompletionSource<bool>(TaskContinuationOptions.LongRunning);
- Task IAwaitableTermination.WasShutDown => shutdownSource.Task;
  }
 }

test/JsonRpc.Tests/Server/SpecifictionRecieverTests.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using FluentAssertions;
@@ -56,6 +56,24 @@ public override IEnumerable<ValueTuple<string, Renor[]>> GetValues()
  new Request(4, "subtract", JObject.FromObject(new {minuend = 42, subtrahend = 23}))
  });
 
+ yield return (
+ @"{""jsonrpc"": ""2.0"", ""method"": ""subtract"", ""id"": 4}",
+ new Renor[]
+ {
+ new Request(4, "subtract", null)
+ });
+
+ // http://www.jsonrpc.org/specification says:
+ // If present, parameters for the rpc call MUST be provided as a Structured value.
+ // Some clients may serialize params as null, instead of omitting it
+ // We're going to pretend we never got the null in the first place.
+ yield return (
+ @"{""jsonrpc"": ""2.0"", ""method"": ""subtract"", ""params"": null, ""id"": 4}",
+ new Renor[]
+ {
+ new Request(4, "subtract", null)
+ });
+
  yield return (
  @"{""jsonrpc"": ""2.0"", ""method"": ""update"", ""params"": [1,2,3,4,5]}",
  new Renor[]
@@ -70,6 +88,17 @@ public override IEnumerable<ValueTuple<string, Renor[]>> GetValues()
  new Notification("foobar", null)
  });
 
+ // http://www.jsonrpc.org/specification says:
+ // If present, parameters for the rpc call MUST be provided as a Structured value.
+ // Some clients may serialize params as null, instead of omitting it
+ // We're going to pretend we never got the null in the first place.
+ yield return (
+ @"{""jsonrpc"": ""2.0"", ""method"": ""foobar"", ""params"": null}",
+ new Renor[]
+ {
+ new Notification("foobar", null)
+ });
+
  yield return (
  @"{""jsonrpc"": ""2.0"", ""method"": 1, ""params"": ""bar""}",
  new Renor[]
@@ -144,4 +173,4 @@ public override IEnumerable<ValueTuple<string, bool>> GetValues()
  }
  }
  }
-}
+}