Apps, web, i18n, UI, partners, payouts, backoffice, bariki, prod infra

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/landing/lib/redirect.ts

@@ -0,0 +1,19 @@
+import { isLocale } from '@barev/i18n';
+import { cookies, headers } from 'next/headers';
+import { redirect } from 'next/navigation';
+
+type SearchParams = Promise<Record<string, string | string[] | undefined>>;
+
+/** Адрес без языка → язык из cookie (выбор на лендинге) или Accept-Language; ?a= и UTM сохраняются */
+export async function redirectToLocale(searchParams: SearchParams, path = ''): Promise<never> {
+  const [sp, c, h] = await Promise.all([searchParams, cookies(), headers()]);
+  const saved = c.get('barev_lang')?.value;
+  const accepted = (h.get('accept-language') ?? '')
+    .split(',')
+    .map((p) => p.split(';')[0]!.trim().split('-')[0]!.toLowerCase())
+    .find(isLocale);
+  const locale = isLocale(saved) ? saved : (accepted ?? 'ru');
+  const qs = new URLSearchParams();
+  for (const [k, v] of Object.entries(sp)) if (typeof v === 'string') qs.set(k, v);
+  redirect(`/${locale}${path}${qs.size ? `?${qs}` : ''}`);
+}