Append flags format to flags enum types in swagger

ArchiSteamFarm/IPC/Integration/EnumFlagsSchemaFilter.cs

@@ -0,0 +1,42 @@
+//     _                _      _  ____   _                           _____
+//    / \    _ __  ___ | |__  (_)/ ___| | |_  ___   __ _  _ __ ___  |  ___|__ _  _ __  _ __ ___
+//   / _ \  | '__|/ __|| '_ \ | |\___ \ | __|/ _ \ / _` || '_ ` _ \ | |_  / _` || '__|| '_ ` _ \
+//  / ___ \ | |  | (__ | | | || | ___) || |_|  __/| (_| || | | | | ||  _|| (_| || |   | | | | | |
+// /_/   \_\|_|   \___||_| |_||_||____/  \__|\___| \__,_||_| |_| |_||_|   \__,_||_|   |_| |_| |_|
+// |
+// Copyright 2015-2020 Łukasz "JustArchi" Domeradzki
+// Contact: JustArchi@JustArchi.net
+// |
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// |
+// http://www.apache.org/licenses/LICENSE-2.0
+// |
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using System;
+using JetBrains.Annotations;
+using Microsoft.OpenApi.Models;
+using Swashbuckle.AspNetCore.SwaggerGen;
+
+namespace ArchiSteamFarm.IPC.Integration {
+	[UsedImplicitly]
+	internal sealed class EnumFlagsSchemaFilter : ISchemaFilter {
+		public void Apply([NotNull] OpenApiSchema schema, [NotNull] SchemaFilterContext context) {
+			if ((schema == null) || (context == null)) {
+				throw new ArgumentNullException(nameof(schema) + " || " + nameof(context));
+			}
+
+			if (!context.Type.IsEnum || !context.Type.IsDefined(typeof(FlagsAttribute), false)) {
+				return;
+			}
+
+			schema.Format = "flags";
+		}
+	}
+}

ArchiSteamFarm/IPC/Startup.cs

@@ -168,6 +168,7 @@ namespace ArchiSteamFarm.IPC {
 					);
 
 					options.EnableAnnotations(true);
+					options.SchemaFilter<EnumFlagsSchemaFilter>();
 
 					options.SwaggerDoc(
 						SharedInfo.ASF, new OpenApiInfo {