Finalize multilingual routing and translations

lib/metadata.ts

@@ -0,0 +1,56 @@
+import type { Metadata } from "next";
+
+import { routing } from "@/i18n/routing";
+import { AppLocale, getLocalizedPath, resolveLocale } from "@/lib/locale";
+
+function getSiteUrl(): URL {
+  return new URL(process.env.NEXT_PUBLIC_SITE_URL ?? "https://mohfarawati.de");
+}
+
+function toAbsoluteUrl(pathname: string): string {
+  return new URL(pathname, getSiteUrl()).toString();
+}
+
+export function buildLocaleAlternates(pathname: string) {
+  const languages = Object.fromEntries(
+    routing.locales.map((locale) => [locale, toAbsoluteUrl(getLocalizedPath(locale, pathname))]),
+  ) as Record<AppLocale, string>;
+
+  return {
+    canonical: toAbsoluteUrl(getLocalizedPath(routing.defaultLocale, pathname)),
+    languages: {
+      ...languages,
+      "x-default": toAbsoluteUrl(getLocalizedPath(routing.defaultLocale, pathname)),
+    },
+  };
+}
+
+type LocalizedMetadataInput = {
+  locale: string;
+  pathname: string;
+  title: string;
+  description: string;
+};
+
+export function buildLocalizedMetadata({
+  locale,
+  pathname,
+  title,
+  description,
+}: LocalizedMetadataInput): Metadata {
+  const localeKey = resolveLocale(locale);
+
+  return {
+    title,
+    description,
+    alternates: buildLocaleAlternates(pathname),
+    openGraph: {
+      title,
+      description,
+      url: toAbsoluteUrl(getLocalizedPath(localeKey, pathname)),
+      siteName: "moh-sass",
+      locale: localeKey,
+      type: "website",
+    },
+  };
+}