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import { CookieNames } from "$configuration";
import { detectLocale, i18n, isLocale, locales } from "$i18n/i18n-util";
import { log_debug } from "$utilities/logger";
import type { Handle, RequestEvent } from "@sveltejs/kit";
import { initAcceptLanguageHeaderDetector } from "typesafe-i18n/detectors";
import type { Locales } from "$i18n/i18n-types";
import { loadAllLocales } from "$i18n/i18n-util.sync";
loadAllLocales();
const L = i18n();
export const handle: Handle = async ({ event, resolve }) => {
const localeCookie = event.cookies.get(CookieNames.locale);
const preferredLocale = getPreferredLocale(event);
let finalLocale = localeCookie ?? preferredLocale;
let forceCookieSet = false;
log_debug("Handling locale", {
locales,
localeCookie,
preferredLocale,
finalLocale,
});
if (!isLocale(finalLocale)) {
log_debug(finalLocale + " is not a valid locale or it does not exist, switching to default: en");
finalLocale = "en";
forceCookieSet = true;
}
if (!localeCookie || forceCookieSet) {
// Set a locale cookie
event.cookies.set(CookieNames.locale, finalLocale, {
sameSite: "strict",
path: "/",
httpOnly: false,
});
}
event.locals.locale = finalLocale as Locales;
event.locals.LL = L[finalLocale as Locales];
return resolve(event, { transformPageChunk: ({ html }) => html.replace("%lang%", finalLocale) });
};
function getPreferredLocale(event: RequestEvent) {
const acceptLanguageDetector = initAcceptLanguageHeaderDetector(event.request);
return detectLocale(acceptLanguageDetector);
}
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