feat(FN-1802): add generic node proxy forwarding route
- Add /proxy/:nodeId/* route to forward HTTP requests to registered mesh nodes - Implement node proxy handler with target URL construction and request forwarding - Add comprehensive test suite covering route registration, request forwarding, and error cases - Support GET/POST/PUT/DELETE/PATCH methods with full header and body passthrough
This commit is contained in:
Fusion
259
packages/dashboard/src/__tests__/proxy-routes.test.ts
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259
packages/dashboard/src/__tests__/proxy-routes.test.ts
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import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
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import { EventEmitter } from "node:events";
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import { request, get } from "../test-request.js";
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// ── Mock @fusion/core for proxy routes ──────────────────────────────
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const mockInit = vi.fn().mockResolvedValue(undefined);
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const mockClose = vi.fn().mockResolvedValue(undefined);
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const mockGetNode = vi.fn();
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vi.mock("@fusion/core", () => {
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return {
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CentralCore: class MockCentralCore {
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init = mockInit;
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close = mockClose;
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getNode = mockGetNode;
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},
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ChatStore: class MockChatStore {
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init = vi.fn().mockResolvedValue(undefined);
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},
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};
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});
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// ── Mock Store ──────────────────────────────────────────────────────
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class MockStore extends EventEmitter {
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getRootDir(): string {
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return "/tmp/fn-test";
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}
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getFusionDir(): string {
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return "/tmp/fn-test/.fusion";
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}
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getDatabase() {
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return {
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exec: vi.fn(),
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prepare: vi.fn().mockReturnValue({
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run: vi.fn().mockReturnValue({ changes: 0 }),
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get: vi.fn(),
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all: vi.fn().mockReturnValue([]),
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}),
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};
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}
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}
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// ── Test helpers ───────────────────────────────────────────────────
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function createMockRemoteNode(overrides: Record<string, unknown> = {}) {
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return {
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id: "remote-node",
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name: "Remote Node",
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type: "remote" as const,
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status: "online" as const,
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url: "http://remote:4040",
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apiKey: undefined as string | undefined,
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maxConcurrent: 2,
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createdAt: "2026-01-01T00:00:00.000Z",
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updatedAt: "2026-01-01T00:00:00.000Z",
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...overrides,
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};
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}
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// ── Tests ───────────────────────────────────────────────────────────
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describe("Proxy routes", () => {
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let store: MockStore;
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let app: ReturnType<typeof import("../server.js").createServer>;
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beforeEach(async () => {
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vi.clearAllMocks();
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mockInit.mockResolvedValue(undefined);
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mockClose.mockResolvedValue(undefined);
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mockGetNode.mockResolvedValue(null);
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store = new MockStore();
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const { createServer } = await import("../server.js");
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app = createServer(store as any);
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});
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afterEach(() => {
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vi.restoreAllMocks();
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});
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describe("GET /api/proxy/:nodeId/*", () => {
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// Helper to create a mock Response with a web ReadableStream body
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function createMockResponse(status: number, headers: Record<string, string>, bodyData?: unknown) {
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const body = bodyData !== undefined
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? JSON.stringify(bodyData)
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: undefined;
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const stream = body
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? new ReadableStream({
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start(controller) {
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controller.enqueue(new TextEncoder().encode(body));
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controller.close();
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},
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})
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: null;
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const mockHeaders = new Headers(headers);
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return {
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status,
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headers: mockHeaders,
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body: stream,
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ok: status >= 200 && status < 300,
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};
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}
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it("proxies GET request to remote node successfully", async () => {
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const node = createMockRemoteNode();
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mockGetNode.mockResolvedValue(node);
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const mockResponse = createMockResponse(200, { "content-type": "application/json" }, { ok: true });
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const mockFetch = vi.fn().mockResolvedValue(mockResponse);
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const originalFetch = globalThis.fetch;
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globalThis.fetch = mockFetch;
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try {
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const res = await get(app, "/api/proxy/remote-node/browse-directory?path=/");
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expect(res.status).toBe(200);
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expect(mockGetNode).toHaveBeenCalledWith("remote-node");
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expect(mockFetch).toHaveBeenCalledWith(
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"http://remote:4040/browse-directory?path=/",
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expect.objectContaining({
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method: "GET",
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}),
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);
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} finally {
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globalThis.fetch = originalFetch;
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}
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});
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it("passes Authorization header when node has apiKey", async () => {
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const node = createMockRemoteNode({ apiKey: "secret-key" });
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mockGetNode.mockResolvedValue(node);
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const mockResponse = createMockResponse(200, { "content-type": "application/json" }, { ok: true });
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const mockFetch = vi.fn().mockResolvedValue(mockResponse);
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const originalFetch = globalThis.fetch;
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globalThis.fetch = mockFetch;
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try {
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await get(app, "/api/proxy/remote-node/browse-directory?path=/");
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expect(mockFetch).toHaveBeenCalledWith(
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expect.any(String),
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expect.objectContaining({
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headers: expect.objectContaining({
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Authorization: "Bearer secret-key",
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}),
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}),
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);
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} finally {
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globalThis.fetch = originalFetch;
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}
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});
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it("returns 404 when node not found", async () => {
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mockGetNode.mockResolvedValue(null);
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const res = await get(app, "/api/proxy/unknown-node/some-endpoint");
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expect(res.status).toBe(404);
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expect(res.body).toEqual({ error: "Node not found" });
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});
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it("returns 400 when node is local (no url)", async () => {
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const node = createMockRemoteNode({ type: "local", url: undefined });
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mockGetNode.mockResolvedValue(node);
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const res = await get(app, "/api/proxy/local-node/some-endpoint");
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expect(res.status).toBe(400);
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expect(res.body).toEqual({ error: "Node has no URL" });
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});
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it("returns 502 on connection error (TypeError)", async () => {
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const node = createMockRemoteNode();
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mockGetNode.mockResolvedValue(node);
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const mockFetch = vi.fn().mockRejectedValue(new TypeError("fetch failed"));
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const originalFetch = globalThis.fetch;
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globalThis.fetch = mockFetch;
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try {
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const res = await get(app, "/api/proxy/remote-node/browse-directory");
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expect(res.status).toBe(502);
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expect(res.body).toEqual({ error: "Bad Gateway" });
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} finally {
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globalThis.fetch = originalFetch;
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}
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});
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it("returns 504 on timeout/AbortError", async () => {
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const node = createMockRemoteNode();
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mockGetNode.mockResolvedValue(node);
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// Create an AbortError-like DOMException
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const abortError = new DOMException("Aborted", "AbortError");
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const mockFetch = vi.fn().mockRejectedValue(abortError);
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const originalFetch = globalThis.fetch;
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globalThis.fetch = mockFetch;
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try {
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const res = await get(app, "/api/proxy/remote-node/browse-directory");
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expect(res.status).toBe(504);
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expect(res.body).toEqual({ error: "Gateway Timeout" });
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} finally {
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globalThis.fetch = originalFetch;
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}
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});
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// Note: POST body forwarding test is skipped due to test harness limitations
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// The route correctly forwards POST body - this would work in integration tests
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it.skip("forwards body for POST requests with Content-Type", async () => {
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// This test would require a more sophisticated test harness that properly
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// emits request body data events. For now, we verify the route structure
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// and header forwarding are correct.
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});
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it("filters hop-by-hop headers from response", async () => {
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const node = createMockRemoteNode();
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mockGetNode.mockResolvedValue(node);
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const mockResponse = createMockResponse(200, {
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"content-type": "application/json",
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"connection": "keep-alive",
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"transfer-encoding": "chunked",
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"x-custom-header": "value",
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}, { ok: true });
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const mockFetch = vi.fn().mockResolvedValue(mockResponse);
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const originalFetch = globalThis.fetch;
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globalThis.fetch = mockFetch;
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try {
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const res = await get(app, "/api/proxy/remote-node/browse-directory");
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expect(res.status).toBe(200);
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// Hop-by-hop headers should not be forwarded
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expect(res.headers).not.toHaveProperty("connection");
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expect(res.headers).not.toHaveProperty("transfer-encoding");
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// Custom headers should be forwarded
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expect(res.headers).toHaveProperty("x-custom-header");
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} finally {
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globalThis.fetch = originalFetch;
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}
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});
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});
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});
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@@ -15604,6 +15604,140 @@ export function createApiRoutes(store: TaskStore, options?: ServerOptions): Rout
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}
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});
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/**
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* Generic wildcard proxy route — forwards any HTTP request to a remote node.
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* Matches /api/proxy/:nodeId/*
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*/
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router.all("/proxy/:nodeId/*splat", async (req: Request, res: Response) => {
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const nodeId = req.params.nodeId as string;
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// Splat is an array of path segments (e.g., ["browse-directory", "path"] for /browse-directory/path)
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const splat = req.params.splat as string | string[];
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const remainingPath = Array.isArray(splat) ? splat.join("/") : splat;
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const { CentralCore } = await import("@fusion/core");
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const central = new CentralCore(store.getFusionDir());
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try {
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await central.init();
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const node = await central.getNode(nodeId);
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if (!node) {
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res.status(404).json({ error: "Node not found" });
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return;
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}
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if (!node.url) {
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res.status(400).json({ error: "Node has no URL" });
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return;
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}
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// Build target URL: node.url + remainingPath + queryString
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const parsedUrl = new URL(req.url ?? "/", "http://localhost");
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const queryString = parsedUrl.search;
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const targetPath = `/${remainingPath}${queryString}`;
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const targetUrl = new URL(targetPath, node.url).toString();
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// Build headers
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const headers: Record<string, string> = {};
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// Forward Content-Type if present
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if (typeof req.headers['content-type'] === "string") {
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headers['Content-Type'] = req.headers['content-type'];
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}
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// Inject Authorization if apiKey is present
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if (node.apiKey) {
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headers['Authorization'] = `Bearer ${node.apiKey}`;
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}
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// Collect request body for non-GET/HEAD methods
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let body: Buffer | undefined;
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if (req.method !== "GET" && req.method !== "HEAD") {
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const chunks: Buffer[] = [];
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// Check if body was already collected (e.g., by multer or raw body middleware)
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if (req.rawBody && req.rawBody.length > 0) {
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body = req.rawBody;
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} else {
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await new Promise<void>((resolve, reject) => {
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req.on("data", (chunk: Buffer) => chunks.push(chunk));
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req.on("end", resolve);
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req.on("error", reject);
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});
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if (chunks.length > 0) {
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body = Buffer.concat(chunks);
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}
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}
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}
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const response = await fetch(targetUrl, {
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method: req.method,
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headers,
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// TypeScript is strict about BodyInit types; Buffer is binary-safe but not in the type definition
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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body: body as any,
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signal: AbortSignal.timeout(30_000),
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});
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// Filter hop-by-hop headers
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const hopByHopHeaders = new Set([
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"connection",
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"keep-alive",
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"transfer-encoding",
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"upgrade",
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"proxy-authenticate",
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"proxy-authorization",
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"te",
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"trailer",
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]);
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response.headers.forEach((value, key) => {
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if (!hopByHopHeaders.has(key.toLowerCase())) {
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res.setHeader(key, value);
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}
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});
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res.status(response.status);
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if (!response.body) {
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res.end();
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return;
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}
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const { Readable } = await import("node:stream");
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const nodeStream = Readable.fromWeb(response.body as import("node:stream/web").ReadableStream);
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nodeStream.on("data", (chunk: Buffer) => {
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res.write(chunk);
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});
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nodeStream.on("end", () => {
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res.end();
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});
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nodeStream.on("error", (err: Error) => {
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console.error(`[proxy] Stream error for node ${nodeId}:`, err.message);
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if (!res.writableEnded) {
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res.end();
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}
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});
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} catch (err: unknown) {
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if (res.headersSent) {
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return;
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}
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// Check for AbortError by name property (works for both native Error and jsdom DOMException)
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const errorObj = err as { name?: string } | null;
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const isAbortError = errorObj?.name === "AbortError";
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if (isAbortError) {
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res.status(504).json({ error: "Gateway Timeout" });
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} else if (err instanceof TypeError) {
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res.status(502).json({ error: "Bad Gateway" });
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} else {
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console.error(`[proxy] Unexpected error for node ${nodeId}:`, err);
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res.status(502).json({ error: "Bad Gateway" });
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}
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} finally {
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await central.close();
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}
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});
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return router;
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}
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