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import {CookieNames} from "$configuration";
import {detectLocale, i18n, isLocale, locales} from "$i18n/i18n-util";
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;
console.debug("Handling locale", {
locales,
localeCookie,
preferredLocale,
finalLocale,
});
if (!isLocale(finalLocale)) {
console.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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