add server status & capabilities

Pilz.Net/Api/Server/ServerCapabilitiesHandler.cs

@@ -0,0 +1,31 @@
+using Pilz.Extensions.Reflection;
+using Pilz.Net.Api.Messages;
+using System.Diagnostics;
+
+namespace Pilz.Net.Api.Server;
+
+public class ServerCapabilitiesHandler : IApiHandlerInitializer
+{
+    protected IApiServer? server;
+
+    public string Route { get; set; } = "/capabilities";
+
+    public virtual void Initialize(IApiServer server)
+    {
+        this.server = server;
+        server.RegisterHandler(GetType().GetMethod(nameof(GetCapabilities))!.CreateDelegate(this), new(Route, "GET"), Debugger.IsAttached);
+    }
+
+    public virtual ApiResult GetCapabilities(ApiRequestInfo req)
+    {
+        var msg = BuildMessage(req);
+        if (server is ServerCapabilitiesMessage message)
+            message.Endpoints.AddRange(server.GetEndpoints());
+        return ApiResult.Ok(msg);
+    }
+
+    protected virtual ApiMessage? BuildMessage(ApiRequestInfo req)
+    {
+        return new ServerCapabilitiesMessage();
+    }
+}