Add dynamic favicon from API (bigcommerce#1280)

.changeset/quick-kangaroos-crash.md

@@ -0,0 +1,5 @@
+---
+"@bigcommerce/catalyst-core": minor
+---
+
+Add dynamic favicon from API on a static route

core/app/[locale]/layout.tsx

@@ -51,6 +51,9 @@ export async function generateMetadata(): Promise<Metadata> {
       template: `%s - ${storeName}`,
       default: pageTitle || storeName,
     },
+    icons: {
+      icon: '/favicon.ico', // app/favicon.ico/route.ts
+    },
     description: metaDescription,
     keywords: metaKeywords ? metaKeywords.split(',') : null,
     other: {

core/app/favicon.ico/route.ts

@@ -0,0 +1,48 @@
+/* eslint-disable check-file/folder-naming-convention */
+/*
+ * Proxy to the store's favicon URL
+ *
+ * If you would prefer to put a favicon image directly in your codebase,
+ * delete this route folder and follow this guide:
+ *
+ * https://nextjs.org/docs/app/api-reference/file-conventions/metadata/app-icons
+ *
+ */
+
+import { client } from '~/client';
+import { graphql } from '~/client/graphql';
+
+const GET_FAVICON_QUERY = graphql(`
+  query GetFavicon {
+    site {
+      settings {
+        faviconUrl
+      }
+    }
+  }
+`);
+
+export const GET = async () => {
+  const { data } = await client.fetch({
+    document: GET_FAVICON_QUERY,
+  });
+
+  const faviconUrl = data.site.settings?.faviconUrl;
+
+  if (!faviconUrl) {
+    return new Response(null, {
+      status: 404,
+    });
+  }
+
+  // fetch the favicon URL and return the data directly (will be statically cached at build time)
+  const faviconData = await fetch(faviconUrl).then((res) => res.arrayBuffer());
+
+  return new Response(faviconData, {
+    headers: {
+      'Content-Type': 'image/x-icon',
+    },
+  });
+};
+
+export const dynamic = 'force-static';