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next/app/sitemap.js

@@ -0,0 +1,74 @@
+import getData from "@/api";
+
+export default async function sitemap() {
+  // Main page information
+  const site = await getData("site", {
+    fields: ["updatedAt"],
+    populate: {
+      edition: {
+        fields: ["id", "updatedAt", "publishedAt"],
+        populate: {
+          programs: true,
+          fields: ["type", "updatedAt", "publishedAt"],
+        },
+      },
+    },
+  });
+
+  const edition = site.data?.attributes.edition.data;
+  const siteLastModified =
+    site && edition
+      ? new Date(
+          Math.max(
+            new Date(site.data?.attributes.updatedAt),
+            new Date(edition.attributes.updatedAt)
+          )
+        )
+      : new Date();
+
+  // Programs information
+  const programs = (edition?.attributes.programs.data ?? []).filter(
+    (p) => p.attributes.publishedAt !== null
+  );
+
+  // Editions information
+  const editions = await getData("editions", { fields: ["id", "updatedAt"] });
+  const previousEditions = editions.data?.filter(
+    (e) => e.id !== edition.id && e.attributes.publishedAt !== null
+  );
+  const editionsLastModifiedTimestamp = Math.max(
+    ...(previousEditions ?? []).map((e) => new Date(e.attributes.updatedAt))
+  );
+
+  const editionsLastModified =
+    editionsLastModifiedTimestamp === -Infinity
+      ? siteLastModified
+      : new Date(editionsLastModifiedTimestamp);
+
+  return [
+    {
+      url: `${process.env.NEXT_PUBLIC_ORIGIN}`,
+      lastModified: siteLastModified,
+      changeFrequency: "yearly",
+      prority: 1,
+    },
+    ...(programs ?? []).map((p) => ({
+      url: `${process.env.NEXT_PUBLIC_ORIGIN}/prog/${p.attributes.type}`,
+      lastModified: new Date(p.attributes.updatedAt),
+      changeFrequency: "yearly",
+      priority: 0.8,
+    })),
+    {
+      url: `${process.env.NEXT_PUBLIC_ORIGIN}/editions`,
+      lastModified: editionsLastModified,
+      changeFrequency: "yearly",
+      priority: 0.6,
+    },
+    ...(previousEditions ?? []).map((e) => ({
+      url: `${process.env.NEXT_PUBLIC_ORIGIN}/editions/${e.id}`,
+      lastModified: new Date(e.attributes.updatedAt),
+      changeFrequency: "yearly",
+      priority: 0.5,
+    })),
+  ];
+}