feat/SW-550 sitemap route

* feat(SW-550): Added rewrites to handle sitemap paths

* feat(SW-550): Added sitemap-index generation

* feat(SW-550): Added sitemap xml file generation

* feat(SW-550): Added feature flag 'HIDE_FOR_NEXT_RELEASE' to sitemap routes


Approved-by: Linus Flood

apps/scandic-web/app/sitemap/route.ts

@@ -0,0 +1,29 @@
+import { notFound } from "next/navigation"
+
+import { env } from "@/env/server"
+
+import { getLastUpdated, getSitemapIds } from "@/utils/sitemap"
+
+export const dynamic = "force-dynamic"
+
+export async function GET() {
+  if (env.HIDE_FOR_NEXT_RELEASE) {
+    notFound()
+  }
+
+  const lastUpdated = await getLastUpdated()
+  const sitemaps = await getSitemapIds()
+
+  const urls = sitemaps.map(
+    (id) => `<sitemap>
+  <loc>${env.PUBLIC_URL}/sitemap-${id}.xml</loc>
+  <lastmod>${lastUpdated}</lastmod>
+</sitemap>`
+  )
+
+  const sitemapIndexXML = `<?xml version="1.0" encoding="UTF-8"?>\n<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">${urls.join("")}\n</sitemapindex>`
+
+  return new Response(sitemapIndexXML, {
+    headers: { "Content-Type": "text/xml" },
+  })
+}