middleware copy.ts

import acceptLanguage from "accept-language"
import { NextRequest, NextResponse } from "next/server"

import { cookieName, fallbackLng, languages } from "@/app/i18n/settings"

acceptLanguage.languages(languages)

export const config = {
  // matcher: '/:lng*'
  matcher: ["/((?!api|_next/static|_next/image|assets|favicon.ico|sw.js|site.webmanifest).*)"],
}

export function middleware(req: NextRequest): NextResponse {
  if (req.nextUrl.pathname.indexOf("homepage") > -1) {
    return NextResponse.next()
  }

  if (req.nextUrl.pathname.indexOf("logo") > -1) {
    return NextResponse.next()
  }

  if (req.nextUrl.pathname.indexOf("icon") > -1 || req.nextUrl.pathname.indexOf("chrome") > -1)
    return NextResponse.next()

  let lng: string | undefined | null
  if (req.cookies.has(cookieName)) lng = acceptLanguage.get(req.cookies.get(cookieName)?.value)
  if (!lng) lng = acceptLanguage.get(req.headers.get("Accept-Language"))
  if (!lng) lng = fallbackLng

  // Redirect if lng in path is not supported
  if (
    !languages.some((loc) => req.nextUrl.pathname.startsWith(`/${loc}`)) &&
    !req.nextUrl.pathname.startsWith("/_next")
  ) {
    return NextResponse.redirect(new URL(`/${lng}${req.nextUrl.pathname}`, req.url))
  }

  if (req.headers.has("referer")) {
    const refererUrl = new URL(req.headers.get("referer") || "")
    const lngInReferer = languages.find((l) => refererUrl.pathname.startsWith(`/${l}`))
    const response = NextResponse.next()
    if (lngInReferer) response.cookies.set(cookieName, lngInReferer)
    return response
  }

  return NextResponse.next()
}