chore: initial project import

app/locale/route.ts

@@ -0,0 +1,28 @@
+import { NextRequest, NextResponse } from "next/server";
+
+import { DEFAULT_LOCALE, isLocale, LOCALE_COOKIE } from "@/lib/i18n";
+
+function sanitizeLocale(raw: string | null) {
+  if (isLocale(raw)) {
+    return raw;
+  }
+
+  return DEFAULT_LOCALE;
+}
+
+export async function GET(request: NextRequest) {
+  const rawTo = request.nextUrl.searchParams.get("to");
+  const nextLocale = sanitizeLocale(rawTo);
+  const back = request.headers.get("referer") || "/";
+  const destination = new URL(back, request.url);
+
+  const response = NextResponse.redirect(destination);
+  response.cookies.set(LOCALE_COOKIE, nextLocale, {
+    path: "/",
+    secure: process.env.NODE_ENV === "production",
+    maxAge: 365 * 24 * 60 * 60,
+    sameSite: "lax"
+  });
+
+  return response;
+}