api: clean up favicon route

apps/api/src/utils/parseUrlMeta.ts

@@ -0,0 +1,38 @@
+import urlMetadata from 'url-metadata';
+
+function findBestFavicon(favicons: UrlMetaData['favicons']) {
+  const match = favicons.find(
+    (favicon) =>
+      favicon.rel === 'shortcut icon' ||
+      favicon.rel === 'icon' ||
+      favicon.rel === 'apple-touch-icon'
+  );
+  if (match) {
+    return match.href;
+  }
+  return null;
+}
+
+function transform(data: UrlMetaData, url: string) {
+  const favicon = findBestFavicon(data.favicons);
+  return {
+    favicon: favicon ? new URL(favicon, url).toString() : null,
+  };
+}
+
+interface UrlMetaData {
+  favicons: {
+    rel: string;
+    href: string;
+    sizes: string;
+  }[];
+}
+
+export async function parseUrlMeta(url: string) {
+  try {
+    const metadata = (await urlMetadata(url)) as UrlMetaData;
+    return transform(metadata, url);
+  } catch (err) {
+    return null;
+  }
+}