Initial upload

Middleware/IPBlockMiddleware.cs

@@ -0,0 +1,30 @@
+public class IPBlockMiddleware
+{
+    private readonly RequestDelegate _next;
+    private static readonly HashSet<string> _blockedIPs = new() // this can be ipv6 or ipv4
+    {
+        "37.203.37.86",
+        "173.2.187.39"
+    };
+
+    public IPBlockMiddleware(RequestDelegate next)
+    {
+        _next = next;
+    }
+
+    public async Task Invoke(HttpContext context)
+    {
+        string? remoteIp = context.Request.Headers["CF-Connecting-IP"].FirstOrDefault()
+        ?? context.Request.Headers["X-Forwarded-For"].FirstOrDefault()
+        ?? context.Connection.RemoteIpAddress?.ToString();
+
+        if (!string.IsNullOrEmpty(remoteIp) && _blockedIPs.Contains(remoteIp))
+        {
+            context.Response.StatusCode = StatusCodes.Status403Forbidden;// this do kick people //Status401Unauthorized;
+            await context.Response.WriteAsync("");
+            return;
+        }
+
+        await _next(context);
+    }
+}