emrgilhzp: Proxy the home feed with cursor paging

tests/feed-route.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, it, vi } from "vitest";
+import { NextRequest } from "next/server";
+import { GET } from "@/app/api/feed/route";
+import { createSession } from "@/lib/session-store";
+
+describe("GET /api/feed", () => {
+  it("no cookie -> 401 sign_in", async () => {
+    const res = await GET(new NextRequest("http://localhost/api/feed"));
+    expect(res.status).toBe(401);
+    expect(await res.json()).toEqual({ error: "sign_in" });
+  });
+
+  it("signed in: page then next page with cursor; limit capped at 50", async () => {
+    const sid = createSession({
+      profileAccessToken: "p", profileAccessTokenExpiresAt: null, profileRefreshToken: "r",
+      feedAccessToken: "T", feedAccessTokenExpiresAt: null,
+      person: { userId: "u", name: "A", email: "a@b.co", pictureUrl: null }, createdAt: Date.now(),
+    });
+    const urls: string[] = [];
+    const orig = globalThis.fetch;
+    globalThis.fetch = vi.fn(async (url: string) => {
+      urls.push(String(url));
+      const next = urls.length === 1 ? "C1" : null;
+      return new Response(JSON.stringify({ data: [{ n: urls.length }], metadata: { nextCursor: next } }), { status: 200 });
+    }) as unknown as typeof fetch;
+    try {
+      const h = { cookie: `mfb_session=${sid}` };
+      const r1 = await GET(new NextRequest("http://localhost/api/feed", { headers: h }));
+      expect(await r1.json()).toEqual({ items: [{ n: 1 }], nextCursor: "C1" });
+      const r2 = await GET(new NextRequest("http://localhost/api/feed?cursor=C1&limit=500", { headers: h }));
+      expect(await r2.json()).toEqual({ items: [{ n: 2 }], nextCursor: null });
+      expect(new URL(urls[0]).searchParams.has("cursor")).toBe(false);
+      const u2 = new URL(urls[1]);
+      expect(u2.searchParams.get("cursor")).toBe("C1");
+      expect(u2.searchParams.get("limit")).toBe("50");
+    } finally {
+      globalThis.fetch = orig;
+    }
+  });
+});