wip maintenance endpoint

Pilz.Net/Api/Messages/MaintenanceModeMessage.cs

@@ -0,0 +1,6 @@
+namespace Pilz.Net.Api.Messages;
+
+public class MaintenanceModeMessage : ApiMessage
+{
+    public bool Enabled { get; set; }
+}

Pilz.Net/Api/Server/MaintenanceHandler.cs

@@ -0,0 +1,48 @@
+using Pilz.Extensions.Reflection;
+using Pilz.Net.Api.Messages;
+using System.Diagnostics;
+using System.Net;
+
+namespace Pilz.Net.Api.Server;
+
+public class MaintenanceHandler : IApiHandlerInitializer
+{
+    public string Route { get; set; } = "/maintenance";
+
+    /// <summary>
+    /// Gets or sets the maintenance mode
+    /// </summary>
+    public bool MaintenanceEnabled { get; set; }
+
+    public void Initialize(IApiServer server)
+    {
+        server.OnCheckContext += Server_OnCheckContext;
+        server.RegisterHandler(GetType().GetMethod(nameof(GetMaintenance))!.CreateDelegate(this), new(Route, "GET"), Debugger.IsAttached);
+    }
+
+    public virtual ApiResult SetMaintenance(ApiRequestInfo req, bool enable)
+    {
+        MaintenanceEnabled = enable;
+        return ApiResult.Ok(new MaintenanceModeMessage
+        {
+            Enabled = MaintenanceEnabled,
+        });
+    }
+
+    public virtual ApiResult GetMaintenance(ApiRequestInfo req)
+    {
+        return ApiResult.Ok(new MaintenanceModeMessage
+        {
+            Enabled = MaintenanceEnabled,
+        });
+    }
+
+    private void Server_OnCheckContext(object sender, ApiContextEventArgs e)
+    {
+        if (MaintenanceEnabled)
+        {
+            
+            // ...
+        }
+    }
+}