Add sitemap.xml and robots.txt

List the home page, blog posts and events in both languages with
hreflang alternates, and point crawlers to the sitemap.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/robots.ts

@@ -0,0 +1,14 @@
+import { SITE_URL } from "@/components/seo"
+
+import type { MetadataRoute } from "next"
+
+export default function robots(): MetadataRoute.Robots {
+  return {
+    rules: {
+      userAgent: "*",
+      allow: "/",
+      disallow: "/api/",
+    },
+    sitemap: `${SITE_URL}/sitemap.xml`,
+  }
+}

src/app/sitemap.ts

@@ -0,0 +1,39 @@
+import { getLocalizedPath, SITE_URL } from "@/components/seo"
+import { routing } from "@/i18n/routing"
+import { getSitemapDocuments } from "@/lib/sanity"
+
+import type { MetadataRoute } from "next"
+
+export const revalidate = 3600 // 1 hour
+
+export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
+  const { posts, events } = await getSitemapDocuments()
+
+  const pages: { path: string; lastModified?: string }[] = [
+    { path: "/" },
+    ...posts.map(post => ({
+      path: `/blog/${post.slug}`,
+      lastModified: post._updatedAt,
+    })),
+    ...events.map(event => ({
+      path: `/event/${event.slug}`,
+      lastModified: event._updatedAt,
+    })),
+  ]
+
+  // One entry per language version, each linking to the other versions
+  return pages.flatMap(({ path, lastModified }) => {
+    const languages = Object.fromEntries(
+      routing.locales.map(locale => [
+        locale,
+        `${SITE_URL}${getLocalizedPath(locale, path)}`,
+      ])
+    )
+
+    return routing.locales.map(locale => ({
+      url: languages[locale],
+      lastModified,
+      alternates: { languages },
+    }))
+  })
+}

src/components/seo.tsx

@@ -7,6 +7,10 @@ import { routing } from "@/i18n/routing"
 export const SITE_URL = "https://uiogaming.no"
 export const THEME_COLOR = "#7d36e7"
 
+/** Adds the locale prefix to a path, e.g. ("en", "/event/x") -> "/en/event/x" */
+export const getLocalizedPath = (locale: Locale, path: string) =>
+  path === "/" ? `/${locale}` : `/${locale}${path}`
+
 type SeoProps = {
   locale: Locale
   /** Path without the locale prefix, e.g. "/" or "/event/some-slug" */
@@ -32,8 +36,6 @@ export async function generateSeoMetadata({
 
   const defaultTitle = "UiO Gaming"
   const metaDescription = description || t("description")
-  const localizedPath = (pageLocale: Locale) =>
-    path === "/" ? `/${pageLocale}` : `/${pageLocale}${path}`
 
   return {
     title: title ? `${title} | ${defaultTitle}` : defaultTitle,
@@ -42,12 +44,12 @@ export async function generateSeoMetadata({
     // Tells search engines that the Norwegian and English versions are the
     // same page. The unprefixed path redirects based on the browser language
     alternates: {
-      canonical: localizedPath(locale),
+      canonical: getLocalizedPath(locale, path),
       languages: {
         ...Object.fromEntries(
           routing.locales.map(pageLocale => [
             pageLocale,
-            localizedPath(pageLocale),
+            getLocalizedPath(pageLocale, path),
           ])
         ),
         "x-default": path,
@@ -60,7 +62,7 @@ export async function generateSeoMetadata({
         ? { type: "article", publishedTime, authors: author && [author] }
         : { type: "website" }),
       locale: locale,
-      url: localizedPath(locale),
+      url: getLocalizedPath(locale, path),
       siteName: defaultTitle,
       images: imageURL
         ? [

src/lib/sanity.ts

@@ -144,3 +144,33 @@ export async function getBoardMembers() {
     }
   )
 }
+
+export async function getSitemapDocuments(): Promise<{
+  posts: { slug: string; _updatedAt: string }[]
+  events: { slug: string; _updatedAt: string }[]
+}> {
+  const query = `
+    {
+      "posts": *[_type == "post" && defined(slug.current)] {
+        "slug": slug.current,
+        _updatedAt
+      },
+      "events": *[_type == "event" && defined(slug.current)] {
+        "slug": slug.current,
+        _updatedAt
+      }
+    }
+  `
+
+  return sanityClient.fetch(
+    query,
+    {},
+    {
+      cache: "force-cache",
+      next: {
+        tags: ["blog-posts", "events"],
+        revalidate: 3600, // 1 hour
+      },
+    }
+  )
+}