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/[sitemapId]/route.ts

@@ -0,0 +1,50 @@
+import { notFound } from "next/navigation"
+
+import { env } from "@/env/server"
+
+import { getSitemapDataById } from "@/utils/sitemap"
+
+import type { NextRequest } from "next/server"
+
+export const dynamic = "force-dynamic"
+
+export async function GET(
+  _request: NextRequest,
+  context: { params: { sitemapId: string } }
+) {
+  if (env.HIDE_FOR_NEXT_RELEASE) {
+    notFound()
+  }
+
+  const sitemapId = context.params.sitemapId
+  if (!sitemapId) {
+    notFound()
+  }
+
+  const sitemapData = await getSitemapDataById(Number(sitemapId))
+  if (!sitemapData.length) {
+    notFound()
+  }
+
+  const entries = sitemapData.map((entry) => {
+    const alternates = Object.entries(entry.alternates).map(
+      ([lang, url]) =>
+        `<xhtml:link rel="alternate" hreflang="${lang}" href="${url}" />`
+    )
+
+    return `
+<url>
+  <loc>${entry.url}</loc>
+  <lastmod>${entry.lastModified}</lastmod>
+  <changefreq>${entry.changeFrequency}</changefreq>
+  <priority>${entry.priority}</priority>
+  ${alternates.join("")}
+</url>`
+  })
+
+  const sitemapXML = `<?xml version="1.0" encoding="UTF-8"?>\n<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml">${entries.join("")}\n</urlset>`
+
+  return new Response(sitemapXML, {
+    headers: { "Content-Type": "text/xml" },
+  })
+}