majd-trading/src/middleware.ts

import { NextResponse, type NextRequest } from "next/server";
import { locales, defaultLocale } from "@/i18n/config";

const PUBLIC_FILE = /\.(.*)$/;

/**
 * Sends every un-prefixed path to a locale-prefixed one. Today `fa` is the only
 * shipped locale; once `en` / `ar` are added, negotiate on `Accept-Language`
 * here and the rest of the app needs no changes.
 */
export function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl;

  const hasLocale = locales.some(
    (locale) => pathname === `/${locale}` || pathname.startsWith(`/${locale}/`)
  );
  if (hasLocale || PUBLIC_FILE.test(pathname)) return NextResponse.next();

  const url = request.nextUrl.clone();
  url.pathname = `/${defaultLocale}${pathname === "/" ? "" : pathname}`;
  return NextResponse.redirect(url);
}

export const config = {
  matcher: ["/((?!api|_next/static|_next/image|images|fonts|favicon.ico).*)"],
};