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middleware.ts
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middleware.ts
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import { NextRequest, NextResponse } from 'next/server'
import acceptLanguage from 'accept-language'
import { fallbackLng, languages, cookieName } from './app/i18n/settings'
acceptLanguage.languages(languages)
export const config = {
// matcher: '/:lng*'
matcher: ['/((?!api|_next/static|_next/image|assets|favicon.ico|sw.js).*)']
}
export function middleware(req: NextRequest) {
let lng
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()
}