🐛 Fixes in CloudFile filemeta transfer via gRPC

DysonNetwork.Shared/Proto/GrpcTypeHelper.cs

@@ -1,4 +1,5 @@
 using System.Text.Json;
+using System.Text.Json.Serialization;
 using Google.Protobuf.Collections;
 using Google.Protobuf.WellKnownTypes;
 using Newtonsoft.Json;
@@ -8,7 +9,14 @@ namespace DysonNetwork.Shared.Proto;
 
 public abstract class GrpcTypeHelper
 {
-    private static readonly JsonSerializerSettings SerializerSettings = new()
+    public static readonly JsonSerializerOptions SystemTextSerializerOptions = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
+        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
+        Converters = { new JsonStringEnumConverter() }
+    };
+    
+    public static readonly JsonSerializerSettings SerializerSettings = new()
     {
         ContractResolver =  new DefaultContractResolver { NamingStrategy = new SnakeCaseNamingStrategy() },
         PreserveReferencesHandling = PreserveReferencesHandling.Objects,

DysonNetwork.Shared/Proto/file.proto

@@ -19,11 +19,11 @@ message CloudFile {
   // Original name of the file
   string name = 2;
 
+  // The metadata uses JSON bytes to store to keep the data structure over gRPC
   // File metadata (e.g., dimensions, duration, etc.)
-  map<string, google.protobuf.Value> file_meta = 3;
-
+  bytes file_meta = 3;
   // User-defined metadata
-  map<string, google.protobuf.Value> user_meta = 4;
+  bytes user_meta = 4;
 
   // MIME type of the file
   string mime_type = 5;