middleware.ts

import { NextResponse, NextRequest } from 'next/server'

import { i18n } from '@/i18n.config'

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

function getLocale(request) {
  const negotiatorHeaders = {}
  request.headers.forEach((value, key) => (negotiatorHeaders[key] = value))

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

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

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

  // Redirect if there is no locale
  if (pathnameIsMissingLocale) {
    const locale = getLocale(request)
    return NextResponse.redirect(new URL(`/${locale}${pathname.startsWith('/') ? '' : '/'}${pathname}`, request.url))
  }
}

export const config = {
  // Matcher ignoring `/_next/` and `/api/`
  matcher: ['/((?!api|_next/static|_next/image|img|favicon.ico).*)']
}