Endpoint/Middleware/MaintenanceModeMiddleware.cs

@@ -0,0 +1,39 @@
+using Microsoft.AspNetCore.Http;
+using Mirea.Api.Endpoint.Common.Attributes;
+using Mirea.Api.Endpoint.Common.Interfaces;
+using System.Threading.Tasks;
+
+namespace Mirea.Api.Endpoint.Middleware;
+
+public class MaintenanceModeMiddleware(RequestDelegate next, IMaintenanceModeService maintenanceModeService, IMaintenanceModeNotConfigureService maintenanceModeNotConfigureService)
+{
+    private static bool IsIgnoreMaintenanceMode(HttpContext context)
+    {
+        var endpoint = context.GetEndpoint();
+        return endpoint?.Metadata.GetMetadata<MaintenanceModeIgnoreAttribute>() != null;
+    }
+
+    public async Task Invoke(HttpContext context)
+    {
+        if (!maintenanceModeService.IsMaintenanceMode && !maintenanceModeNotConfigureService.IsMaintenanceMode || IsIgnoreMaintenanceMode(context))
+            await next(context);
+        else
+        {
+
+            context.Response.StatusCode = StatusCodes.Status503ServiceUnavailable;
+            context.Response.ContentType = "plain/text";
+
+            string error;
+            if (maintenanceModeService.IsMaintenanceMode)
+            {
+                context.Response.Headers.RetryAfter = "600";
+                error = "The service is currently undergoing maintenance. Please try again later.";
+            }
+            else
+                error =
+                    "The service is currently not configured. Go to the setup page if you are an administrator or try again later.";
+
+            await context.Response.WriteAsync(error);
+        }
+    }
+}

Endpoint/Program.cs

@@ -13,6 +13,7 @@ using Mirea.Api.Endpoint.Common.Services;
 using Mirea.Api.Endpoint.Configuration;
 using Mirea.Api.Endpoint.Configuration.General;
 using Mirea.Api.Endpoint.Configuration.Swagger;
+using Mirea.Api.Endpoint.Middleware;
 using Swashbuckle.AspNetCore.SwaggerGen;
 using System;
 using System.Collections;
@@ -118,6 +119,7 @@ public class Program
                 }
             });
         }
+        app.UseMiddleware<MaintenanceModeMiddleware>();
 
         app.UseHttpsRedirection();