1 files changed, 49 insertions, 0 deletions
diff --git a/code/app/src/hooks.server.ts b/code/app/src/hooks.server.ts
new file mode 100644
index 0000000..2720480
--- /dev/null
+++ b/code/app/src/hooks.server.ts
@@ -0,0 +1,49 @@
+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);
+}