feature: localization's first implmentation done. all frontend hardcoded text is now localized.

frontend/src/proxy.ts

@@ -1,5 +1,13 @@
+import createMiddleware from 'next-intl/middleware';
 import { NextResponse } from 'next/server';
 import type { NextRequest } from 'next/server';
+import {
+  getLocaleFromPathname,
+  routing,
+  stripLocaleFromPathname,
+} from './i18n/routing';
+
+const handleI18nRouting = createMiddleware(routing);
 
 /** Routes that must work without an existing session (first-time invitees). */
 const publicRoutes = [
@@ -13,30 +21,42 @@ const publicRoutes = [
   '/accept-organization-invite',
 ];
 
+function isRedirectResponse(response: Response): boolean {
+  return response.status >= 300 && response.status < 400;
+}
+
 export function proxy(request: NextRequest) {
+  const intlResponse = handleI18nRouting(request);
+
+  if (isRedirectResponse(intlResponse)) {
+    return intlResponse;
+  }
+
   const { pathname } = request.nextUrl;
+  const pathWithoutLocale = stripLocaleFromPathname(pathname);
+  const locale = getLocaleFromPathname(pathname);
   const token = request.cookies.get('accessToken')?.value;
   const isAuthenticated = !!token;
 
-  if (isAuthenticated && pathname === '/') {
-    return NextResponse.redirect(new URL('/today', request.url));
+  if (isAuthenticated && pathWithoutLocale === '/') {
+    return NextResponse.redirect(new URL(`/${locale}/today`, request.url));
   }
 
-  if (publicRoutes.includes(pathname)) {
-    return NextResponse.next();
+  if (publicRoutes.includes(pathWithoutLocale)) {
+    return intlResponse;
   }
 
   if (!isAuthenticated) {
-    if (pathname === '/login') {
-      return NextResponse.next();
+    if (pathWithoutLocale === '/login') {
+      return intlResponse;
     }
 
-    const loginUrl = new URL('/login', request.url);
+    const loginUrl = new URL(`/${locale}/login`, request.url);
     loginUrl.searchParams.set('from', pathname);
     return NextResponse.redirect(loginUrl);
   }
 
-  return NextResponse.next();
+  return intlResponse;
 }
 
 export const config = {