feat(domain): add native-feed detector (Atom/RSS/JSON)

2026-06-21 06:13:48 +00:00 · 2026-05-25 17:05:39 +02:00
parent 021aeabd05
commit df5546fedd
3 changed files with 126 additions and 0 deletions
@@ -0,0 +1,65 @@
+import { describe, it, expect } from "vitest";
+import { detectNativeFeeds, unionNativeFeeds } from "./native-feed";
+
+describe("detectNativeFeeds", () => {
+  it("maps the three canonical MIME types to kinds", () => {
+    expect(
+      detectNativeFeeds([
+        { href: "https://x.com/atom", type: "application/atom+xml" },
+        { href: "https://x.com/rss", type: "application/rss+xml" },
+        { href: "https://x.com/json", type: "application/feed+json" },
+      ]),
+    ).toEqual([
+      { url: "https://x.com/atom", type: "atom" },
+      { url: "https://x.com/rss", type: "rss" },
+      { url: "https://x.com/json", type: "json" },
+    ]);
+  });
+
+  it("ignores unknown MIME types (application/json, text/html)", () => {
+    expect(
+      detectNativeFeeds([
+        { href: "https://x.com/api", type: "application/json" },
+        { href: "https://x.com/", type: "text/html" },
+      ]),
+    ).toEqual([]);
+  });
+
+  it("strips MIME parameters and is case-insensitive", () => {
+    expect(
+      detectNativeFeeds([
+        { href: "https://x.com/f", type: "Application/RSS+XML; charset=utf-8" },
+      ]),
+    ).toEqual([{ url: "https://x.com/f", type: "rss" }]);
+  });
+
+  it("dedupes by URL (first kind wins)", () => {
+    expect(
+      detectNativeFeeds([
+        { href: "https://x.com/f", type: "application/rss+xml" },
+        { href: "https://x.com/f", type: "application/atom+xml" },
+      ]),
+    ).toEqual([{ url: "https://x.com/f", type: "rss" }]);
+  });
+});
+
+describe("unionNativeFeeds", () => {
+  it("returns [] for undefined", () => {
+    expect(unionNativeFeeds(undefined)).toEqual([]);
+  });
+
+  it("unions across senders, deduping by URL", () => {
+    expect(
+      unionNativeFeeds({
+        "a@x.com": [{ url: "https://x.com/rss", type: "rss" }],
+        "b@y.com": [
+          { url: "https://x.com/rss", type: "rss" },
+          { url: "https://y.com/atom", type: "atom" },
+        ],
+      }),
+    ).toEqual([
+      { url: "https://x.com/rss", type: "rss" },
+      { url: "https://y.com/atom", type: "atom" },
+    ]);
+  });
+});