Detect podcast RSS feeds from item enclosures

plugins/feed-discovery/src/feed-discovery.test.ts

@@ -29,6 +29,16 @@ describe("feed parsing", () => {
     expect(result.sampleItems[0]).toMatchObject({ title: "Launch tiny products", url: "https://example.com/post" });
   });
 
+  it("detects podcast RSS feeds from item enclosures", () => {
+    const result = parseFeedDocument(
+      "https://example.com/podcast.xml",
+      `<?xml version="1.0"?><rss version="2.0"><channel><title>Audio Show</title><link>https://example.com</link><item><title>Episode 1</title><enclosure url="https://example.com/episode-1.mp3" type="audio/mpeg" length="12345" /></item></channel></rss>`
+    );
+
+    expect(result.ok).toBe(true);
+    expect(result.kind).toBe("podcast");
+  });
+
   it("parses Atom and JSON Feed documents", () => {
     const atom = parseFeedDocument("https://example.com/atom.xml", `<feed><title>Atom Feed</title><entry><title>Entry</title><updated>2026-06-09T00:00:00Z</updated></entry></feed>`);
     const json = parseFeedDocument("https://example.com/feed.json", JSON.stringify({ version: "https://jsonfeed.org/version/1.1", title: "JSON Feed", items: [{ title: "Item", url: "https://example.com/item" }] }), "application/feed+json");

plugins/feed-discovery/src/feed-parsing.ts

@@ -96,7 +96,7 @@ function parseRss(feedUrl: string, rss: Record<string, unknown>): ValidationResu
     title: title || "Untitled RSS Feed",
     description: stringValue(channel.description),
     homepageUrl: linkValue(channel.link),
-    kind: detectRssKind(channel),
+    kind: detectRssKind(channel, items),
     language: stringValue(channel.language),
     imageUrl: imageValue(channel.image),
     lastPublishedAt: newestDate([stringValue(channel.lastBuildDate), stringValue(channel.pubDate), ...sampleItems.map((item) => item.publishedAt)]),
@@ -132,13 +132,30 @@ function parseAtom(feedUrl: string, feed: Record<string, unknown>): ValidationRe
   };
 }
 
-function detectRssKind(channel: Record<string, unknown>): FeedKind {
+function detectRssKind(channel: Record<string, unknown>, items: Record<string, unknown>[]): FeedKind {
   if (channel.itunes || channel["itunes:author"] || channel.enclosure) {
     return "podcast";
   }
+  if (items.some(hasPodcastEnclosure)) {
+    return "podcast";
+  }
   return "blog";
 }
 
+function hasPodcastEnclosure(item: Record<string, unknown>) {
+  return asArray(item.enclosure)
+    .filter(isRecord)
+    .some((enclosure) => {
+      const type = stringValue(enclosure.type)?.toLowerCase();
+      const url = stringValue(enclosure.url);
+      return (
+        type?.startsWith("audio/") ||
+        type?.startsWith("video/") ||
+        /\.(mp3|m4a|mp4|m4v|ogg|oga|wav|aac|flac)(?:[?#].*)?$/i.test(url ?? "")
+      );
+    });
+}
+
 function imageValue(value: unknown) {
   if (isRecord(value)) {
     return stringValue(value.url);