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Minecraft-Realms-Emulator/Middlewares/MinecraftCookieMiddleware.cs

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+using Minecraft_Realms_Emulator.Attributes;
+using System.Text;
+
+namespace Minecraft_Realms_Emulator.Middlewares
+{
+    public class MinecraftCookieMiddleware(RequestDelegate next)
+    {
+        private readonly RequestDelegate _next = next;
+
+        public async Task Invoke(HttpContext httpContext)
+        {
+            var endpoint = httpContext.GetEndpoint();
+            var attribute = endpoint?.Metadata.GetMetadata<RequireMinecraftCookieAttribute>();
+
+            if (attribute == null)
+            {
+                await _next(httpContext);
+                return;
+            }
+
+            if (httpContext.Request.Headers.Cookie.ToString() == "")
+            {
+                httpContext.Response.StatusCode = 401;
+                await httpContext.Response.Body.WriteAsync(Encoding.UTF8.GetBytes("Authorization required"));
+                return;
+            }
+
+            string cookie = httpContext.Request.Headers.Cookie.ToString();
+            if (!attribute.HasMinecraftCookie(cookie)) throw new UnauthorizedAccessException("Malformed cookie header");
+
+            await _next(httpContext);
+        }
+    }
+}