Add admin login page and required logic

middleware.ts

@@ -0,0 +1,25 @@
+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+
+const protectedRoutes = ["/dashboard"];
+const authRoutes = ["/login", "/register"];
+
+export function middleware(request: NextRequest) {
+  const token = request.cookies.get("token")?.value;
+
+  if (
+    protectedRoutes.some((route) => request.nextUrl.pathname.startsWith(route))
+  ) {
+    if (!token) {
+      return NextResponse.redirect(new URL("/login", request.url));
+    }
+  }
+
+  if (authRoutes.includes(request.nextUrl.pathname)) {
+    if (token) {
+      return NextResponse.redirect(new URL("/dashboard", request.url));
+    }
+  }
+
+  return NextResponse.next();
+}