root
65 lines
2.3 KiB
TypeScript
65 lines
2.3 KiB
TypeScript
import { NextResponse } from 'next/server'
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import type { NextRequest } from 'next/server'
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const SHARED_LANGUAGE_COOKIE = 'rentaldrivego-language'
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const MARKETPLACE_LANGUAGE_COOKIE = 'marketplace-language'
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function rejectInternalSubrequest(request: NextRequest): NextResponse | null {
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if (!request.headers.has('x-middleware-subrequest')) return null
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return new NextResponse('Unsupported internal request header', { status: 400 })
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}
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function isValidLanguage(val: string | null | undefined): val is 'en' | 'fr' | 'ar' {
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return val === 'en' || val === 'fr' || val === 'ar'
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}
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function detectFromAcceptLanguage(header: string | null): 'en' | 'fr' | 'ar' {
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if (!header) return 'en'
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for (const entry of header.split(',')) {
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const code = entry.split(';')[0].trim().split('-')[0].toLowerCase()
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if (code === 'ar' || code === 'fr' || code === 'en') return code as 'en' | 'fr' | 'ar'
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}
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return 'en'
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}
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export function middleware(request: NextRequest) {
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const rejected = rejectInternalSubrequest(request)
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if (rejected) return rejected
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const sharedLang = request.cookies.get(SHARED_LANGUAGE_COOKIE)?.value
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// Already has the canonical language cookie — no action needed
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if (isValidLanguage(sharedLang)) return NextResponse.next()
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const legacyLang = request.cookies.get(MARKETPLACE_LANGUAGE_COOKIE)?.value
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const resolved: 'en' | 'fr' | 'ar' = isValidLanguage(legacyLang)
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? legacyLang
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: detectFromAcceptLanguage(request.headers.get('accept-language'))
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// Inject the resolved language into the request cookie header so that
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// getMarketplaceLanguage() (which calls cookies()) sees the correct value
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// even on this very first render — before the browser has stored the cookie.
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const requestHeaders = new Headers(request.headers)
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const existing = request.headers.get('cookie') ?? ''
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const injected = `${SHARED_LANGUAGE_COOKIE}=${resolved}`
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requestHeaders.set('cookie', existing ? `${existing}; ${injected}` : injected)
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const response = NextResponse.next({ request: { headers: requestHeaders } })
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// Persist in the browser for future requests
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response.cookies.set(SHARED_LANGUAGE_COOKIE, resolved, {
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maxAge: 365 * 24 * 60 * 60,
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path: '/',
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sameSite: 'lax',
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})
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return response
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}
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export const config = {
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matcher: [
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'/((?!_next/static|_next/image|favicon\\.ico|.*\\.(?:png|ico|jpg|jpeg|svg|webp)$).*)',
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],
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}
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