add redirect for /[contractAddress] to mainnet (#69)

packages/nextjs/middleware.ts

@@ -0,0 +1,21 @@
+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+
+// Viem's address regex
+const addressRegex = /^0x[a-fA-F0-9]{40}$/;
+
+export function middleware(request: NextRequest) {
+  const { pathname } = request.nextUrl;
+
+  // Extract the first path segment after the initial slash, if any.
+  const pathSegments = pathname.split("/").filter(Boolean);
+
+  // Check if there is exactly one path segment and if it matches the address regex.
+  if (pathSegments.length === 1 && addressRegex.test(pathSegments[0])) {
+    const newURL = new URL(`/${pathSegments[0]}/1`, request.url);
+    return NextResponse.redirect(newURL);
+  }
+
+  // For all other requests, proceed with normal handling.
+  return NextResponse.next();
+}