Make avatar imager resilient with upstream fallback everywhere

src/lib/runtime-avatar-route.test.ts

@@ -42,3 +42,27 @@ it("rejects malformed figure input without contacting a renderer", async () => {
 	).toBe(400);
 	expect(fetcher).not.toHaveBeenCalled();
 });
+it("falls back to the public Habbo renderer when the configured imager is down", async () => {
+	const fetcher = vi.fn(async (input: string | URL) => {
+		const url = new URL(String(input));
+		if (url.origin === "https://hotel.test")
+			return new Response("unavailable", { status: 503 });
+		return new Response(new Uint8Array([4, 5, 6]), {
+			headers: { "content-type": "image/png" },
+		});
+	});
+	vi.stubGlobal("fetch", fetcher);
+	vi.stubEnv("IMAGER_URL", "https://hotel.test/avatarimage");
+	const result = await GET(
+		new NextRequest(
+			"https://hotel.test/api/imaging/avatar?figure=hd-180-1&img_format=apng&effect=0",
+		),
+	);
+	expect(result.status).toBe(200);
+	expect(result.headers.get("x-imager-source")).toBe("fallback");
+	expect(result.headers.get("cache-control")).toContain("max-age=300");
+	const target = new URL(String(fetcher.mock.calls.at(-1)?.[0]));
+	expect(target.host).toBe("www.habbo.com");
+	expect(target.searchParams.get("img_format")).toBe("png");
+	expect(target.searchParams.has("effect")).toBe(false);
+});