added dynamic sitemap

Author: steven-tey

app/sitemap.ts

@@ -0,0 +1,24 @@
+import { headers } from "next/headers";
+import { getPostsForSite } from "@/lib/fetchers";
+
+export default async function Sitemap() {
+  const headersList = headers();
+  const domain =
+    headersList
+      .get("host")
+      ?.replace(".localhost:3000", `.${process.env.NEXT_PUBLIC_ROOT_DOMAIN}`) ??
+    "vercel.pub";
+
+  const posts = await getPostsForSite(domain);
+
+  return [
+    {
+      url: `https://${domain}`,
+      lastModified: new Date(),
+    },
+    ...posts.map(({ slug }) => ({
+      url: `https://${domain}/${slug}`,
+      lastModified: new Date(),
+    })),
+  ];
+}