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App Directory: Override browser locale by setting NEXT_LOCALE? 🌍

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American Wirehair posted this in #help-forum
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American WirehairOP
Hi,
I'm using the new app directory based routing, and have set up a pretty standard middleware to handle i18n routing. This works. But with the page based i18n handeling I could set the NEXT_LOCALE cookie to let users override the language settings. This does not work out of the box it looks like. How would I achieve this using app directory?

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American WirehairOP
Here is my middleware.ts.

import { NextResponse } from "next/server"
import type { NextRequest } from "next/server"
import { cookies } from "next/headers"
import { i18n } from "./i18n-config"

import { match as matchLocale } from "@formatjs/intl-localematcher"
import Negotiator from "negotiator"

function getLocale(request: NextRequest): string | undefined {
  const negotiatorHeaders: Record<string, string> = {}
  request.headers.forEach((value, key) => (negotiatorHeaders[key] = value))

  // @ts-ignore locales are readonly
  const locales: string[] = i18n.locales
  const languages = new Negotiator({ headers: negotiatorHeaders }).languages(
    locales
  )

  const locale = matchLocale(languages, locales, i18n.defaultLocale)

  return locale
}

export function middleware(request: NextRequest) {
  const pathname = request.nextUrl.pathname

  const cookieStore = cookies()
  const cookieLocale = cookieStore.get("NEXT_LOCALE")?.value

   if (
     [
       "/logo.svg",
       "/logo-white.svg",
       "/favicon.ico",
       // Your other files in `public`
     ].includes(pathname)
   )
     return

  const pathnameIsMissingLocale = i18n.locales.every(
    (locale) => !pathname.startsWith(`/${locale}/`) && pathname !== `/${locale}`
  )

  if (pathnameIsMissingLocale) {
    const locale = getLocale(request)

    return NextResponse.redirect(
      new URL(
        `/${locale}${pathname.startsWith("/") ? "" : "/"}${pathname}`,
        request.url
      )
    )
  }
}

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