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middleware.ts
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middleware.ts
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import { NextRequest, NextResponse } from 'next/server'
import { match as matchLocale } from '@formatjs/intl-localematcher'
import Negotiator from 'negotiator'
import { i18n } from './constants/i18n.config'
let locales = i18n.locales
let defaultLocale = i18n.defaultLocale
function getLocale(request: NextRequest): string {
const negotiatorHeaders: Record<string, string> = {}
request.headers.forEach((value, key) => (negotiatorHeaders[key] = value))
const languages = new Negotiator({ headers: negotiatorHeaders }).languages()
return matchLocale(languages, locales, defaultLocale)
}
export function middleware(request: NextRequest) {
// Check if there is any supported locale in the pathname
const { pathname } = request.nextUrl
if (
pathname.startsWith(`/${defaultLocale}/`) ||
pathname === `/${defaultLocale}`
) {
return NextResponse.redirect(
new URL(
pathname.replace(
`/${defaultLocale}`,
pathname === `/${defaultLocale}` ? "/" : ""
),
request.url
)
)
}
const pathnameIsMissingLocale = i18n.locales.every(
(locale) => !pathname.startsWith(`/${locale}/`) && pathname !== `/${locale}`
)
if (pathnameIsMissingLocale) {
const locale = getLocale(request)
return NextResponse.rewrite(
new URL(
`/${locale}${pathname}${request.nextUrl.search}`,
request.nextUrl.href
)
)
}
}
export const config = {
matcher: [
// Skip all internal paths (_next)
'/((?!_next|api|_next/static|_next/image|images|favicon.ico|robots.txt|sitemap.xml|sitemap-0.xml|server-sitemap.xml).*)',
// Optional: only run on root (/) URL
// '/'
],
}