Adding login admin, fix ipv6 Vienamese version, add env example

middleware.ts

@@ -1,41 +1,14 @@
 import type { NextRequest } from "next/server";
 import { NextResponse } from "next/server";
 
-function unauthorized() {
-  return new NextResponse("Authentication required", {
-    status: 401,
-    headers: {
-      "WWW-Authenticate": 'Basic realm="IPv6 Admin"',
-    },
-  });
-}
-
 export function middleware(request: NextRequest) {
-  const user = process.env.ADMIN_BASIC_AUTH_USER;
-  const pass = process.env.ADMIN_BASIC_AUTH_PASS;
+  const session = request.cookies.get("admin_session");
 
-  if (!user || !pass) {
-    return NextResponse.next();
-  }
-
-  const auth = request.headers.get("authorization");
-  if (!auth?.startsWith("Basic ")) {
-    return unauthorized();
-  }
-
-  let decoded: string;
-  try {
-    decoded = atob(auth.slice(6));
-  } catch {
-    return unauthorized();
-  }
-
-  const colon = decoded.indexOf(":");
-  const u = colon >= 0 ? decoded.slice(0, colon) : "";
-  const p = colon >= 0 ? decoded.slice(colon + 1) : "";
-
-  if (u !== user || p !== pass) {
-    return new NextResponse("Unauthorized", { status: 401 });
+  if (!session || session.value !== "true") {
+    // If not authenticated and trying to access admin, redirect to login
+    const url = request.nextUrl.clone();
+    url.pathname = "/login";
+    return NextResponse.redirect(url);
   }
 
   return NextResponse.next();