Adds ValueMiddleware responding to ?VALUE requests

vrc-oscquery-lib/OSCQueryHttpServer.cs

@@ -4,7 +4,8 @@
 using System.Net;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
-
+using Newtonsoft.Json;
+
 namespace VRC.OSCQuery
 {
     public class OSCQueryHttpServer : IDisposable
@@ -33,7 +34,8 @@ public OSCQueryHttpServer(OSCQueryService oscQueryService, ILogger<OSCQueryServi
             _listener.Prefixes.Add(prefix);
             _preMiddleware = new List<Func<HttpListenerContext, Action, Task>>
             {
-                HostInfoMiddleware
+                HostInfoMiddleware,
+                ValueMiddleware
             };
             _postMiddleware = new List<Func<HttpListenerContext, Action, Task>>
             {
@@ -118,6 +120,45 @@ private async Task HostInfoMiddleware(HttpListenerContext context, Action next)
             }
         }
 
+        private async Task ValueMiddleware(HttpListenerContext context, Action next)
+        {
+            if (!context.Request.RawUrl.Contains(Attributes.VALUE))
+            {
+                next();
+                return;
+            }
+
+            try
+            {
+                var node = _oscQuery.RootNode.GetNodeWithPath(context.Request.Url.LocalPath);
+                var returnString = "";
+                if (node.Access == Attributes.AccessValues.WriteOnly) 
+                {
+                    context.Response.StatusCode = (int)HttpStatusCode.NoContent;
+                    context.Response.ContentType = "text/plain";
+                    returnString = "Inappropriate Request";
+                }
+                else
+                {
+                    context.Response.ContentType = "application/json";
+                    returnString = $"{{ \"VALUE\": {JsonConvert.SerializeObject(node.Value, OSCQueryNode.WriteSettings)} }}";
+                }
+
+                // Send Response
+                context.Response.Headers.Add("pragma:no-cache");
+                context.Response.ContentLength64 = returnString.Length;
+                using (var sw = new StreamWriter(context.Response.OutputStream))
+                {
+                    await sw.WriteAsync(returnString);
+                    await sw.FlushAsync();
+                }
+            }
+            catch (Exception e)
+            {
+                Logger.LogError($"Could not construct and send Value: {e.Message}");
+            }
+        }
+
         private static string _pathToResources;
 
         private static string PathToResources

vrc-oscquery-lib/OSCQueryNode.cs

@@ -169,7 +169,7 @@ public static void AddConverter(JsonConverter c)
             WriteSettings.Converters.Add(c);
         }
 
-        private static JsonSerializerSettings WriteSettings = new JsonSerializerSettings()
+        internal static JsonSerializerSettings WriteSettings = new JsonSerializerSettings()
         {
             NullValueHandling = NullValueHandling.Ignore,
         };