fix(discord): apply proxy to app-id and allowlist REST lookups

src/discord/monitor/provider.rest-proxy.test.ts

@@ -0,0 +1,63 @@
+import { describe, expect, it, vi } from "vitest";
+
+const { undiciFetchMock, proxyAgentSpy } = vi.hoisted(() => ({
+  undiciFetchMock: vi.fn(),
+  proxyAgentSpy: vi.fn(),
+}));
+
+vi.mock("undici", () => {
+  class ProxyAgent {
+    proxyUrl: string;
+    constructor(proxyUrl: string) {
+      if (proxyUrl === "bad-proxy") {
+        throw new Error("bad proxy");
+      }
+      this.proxyUrl = proxyUrl;
+      proxyAgentSpy(proxyUrl);
+    }
+  }
+  return {
+    ProxyAgent,
+    fetch: undiciFetchMock,
+  };
+});
+
+describe("resolveDiscordRestFetch", () => {
+  it("uses undici proxy fetch when a proxy URL is configured", async () => {
+    const runtime = {
+      log: vi.fn(),
+      error: vi.fn(),
+    } as const;
+    undiciFetchMock.mockReset().mockResolvedValue(new Response("ok", { status: 200 }));
+    proxyAgentSpy.mockReset();
+
+    const { __testing } = await import("./provider.js");
+    const fetcher = __testing.resolveDiscordRestFetch("http://proxy.test:8080", runtime);
+
+    await fetcher("https://discord.com/api/v10/oauth2/applications/@me");
+
+    expect(proxyAgentSpy).toHaveBeenCalledWith("http://proxy.test:8080");
+    expect(undiciFetchMock).toHaveBeenCalledWith(
+      "https://discord.com/api/v10/oauth2/applications/@me",
+      expect.objectContaining({
+        dispatcher: expect.objectContaining({ proxyUrl: "http://proxy.test:8080" }),
+      }),
+    );
+    expect(runtime.log).toHaveBeenCalledWith("discord: rest proxy enabled");
+    expect(runtime.error).not.toHaveBeenCalled();
+  });
+
+  it("falls back to global fetch when proxy URL is invalid", async () => {
+    const runtime = {
+      log: vi.fn(),
+      error: vi.fn(),
+    } as const;
+    const { __testing } = await import("./provider.js");
+
+    const fetcher = __testing.resolveDiscordRestFetch("bad-proxy", runtime);
+
+    expect(fetcher).toBe(fetch);
+    expect(runtime.error).toHaveBeenCalled();
+    expect(runtime.log).not.toHaveBeenCalled();
+  });
+});