fumadocs-core/dist/i18n/middleware.js

The React.js library for building a documentation website

import { getNegotiator } from "../negotiation/index.js";
import { match } from "@formatjs/intl-localematcher";
import { NextResponse } from "next/server";

//#region src/i18n/middleware.ts
const DefaultFormatter = {
	get(url) {
		const segs = url.pathname.split("/");
		if (segs.length > 1 && segs[1]) return segs[1];
	},
	add(url, locale) {
		const next = new URL(url);
		next.pathname = `${url.basePath}/${locale}/${url.pathname}`.replaceAll(/\/+/g, "/");
		return next;
	},
	remove(url) {
		const next = new URL(url);
		const pathname = url.pathname.split("/").slice(2).join("/");
		next.pathname = `${url.basePath}/${pathname}`.replaceAll(/\/+/g, "/");
		return next;
	}
};
function createI18nMiddleware({ languages, defaultLanguage, format = DefaultFormatter, cookieName = "FD_LOCALE", hideLocale = "never" }) {
	let formatter;
	if (typeof format === "function") formatter = {
		...DefaultFormatter,
		add(url, locale) {
			const next = new URL(url);
			next.pathname = format(locale, url.pathname);
			return next;
		}
	};
	else formatter = format;
	return (request) => {
		const url = request.nextUrl;
		let pathLocale = formatter.get(url);
		if (pathLocale && !languages.includes(pathLocale)) pathLocale = void 0;
		if (!pathLocale) {
			if (hideLocale === "default-locale") return NextResponse.rewrite(formatter.add(url, defaultLanguage));
			const preferred = match(getNegotiator(request).languages(languages), languages, defaultLanguage);
			if (hideLocale === "always") {
				const locale = request.cookies.get(cookieName)?.value ?? preferred;
				return NextResponse.rewrite(formatter.add(url, locale));
			}
			return NextResponse.redirect(formatter.add(url, preferred));
		}
		if (hideLocale === "always" || hideLocale === "default-locale" && pathLocale === defaultLanguage) {
			const res = NextResponse.redirect(formatter.remove(url));
			res.cookies.set(cookieName, pathLocale);
			return res;
		}
		return NextResponse.next();
	};
}

//#endregion
export { DefaultFormatter, createI18nMiddleware };
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