Ekklesia/apps/api/tests/app.test.ts

import { ANONYMOUS_PRINCIPAL, createAuthenticatedPrincipal } from "@ekklesia/contracts";
import type { AuthorizationEvaluator, AuthorizationStore } from "@ekklesia/core/authorization";
import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
import { IdentityRuntimeError } from "@ekklesia/core/identity";
import { describe, expect, it, vi } from "vitest";
import { createApiApp, type CreateApiAppAuthorizationOptions } from "../src/app.js";

const trustedOrigin = "https://dashboard.example.test";
const untrustedOrigin = "https://evil.example.test";

function fakeRuntime(overrides: Partial<EkklesiaIdentityRuntime> = {}): EkklesiaIdentityRuntime {
  return {
    handleAuthRequest: vi.fn().mockResolvedValue(new Response("auth-ok", { status: 200 })),
    resolvePrincipal: vi.fn().mockResolvedValue(ANONYMOUS_PRINCIPAL),
    ...overrides,
  };
}

/** A fully stubbed authorization dependency, denying everything by default — tests that need a
 * specific decision or store behavior override the relevant method explicitly. */
function fakeAuthorization(overrides: {
  readonly evaluator?: Partial<AuthorizationEvaluator>;
  readonly store?: Partial<AuthorizationStore>;
}): CreateApiAppAuthorizationOptions {
  const evaluator: AuthorizationEvaluator = {
    authorize: vi.fn().mockResolvedValue({ allowed: false }),
    ...overrides.evaluator,
  };
  const store: AuthorizationStore = {
    createGrant: vi.fn(),
    grantPlatformOwner: vi.fn(),
    hasActiveGrant: vi.fn().mockResolvedValue(false),
    isPlatformOwner: vi.fn().mockResolvedValue(false),
    listGrantsForUser: vi.fn().mockResolvedValue([]),
    revokeGrant: vi.fn(),
    revokePlatformOwner: vi.fn(),
    ...overrides.store,
  };
  return { evaluator, store };
}

describe("Ekklesia API Hono application", () => {
  it("mounts Better Auth exactly under /api/auth/*", async () => {
    const runtime = fakeRuntime();
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime,
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/auth/sign-in/email", { method: "POST" });

    expect(response.status).toBe(200);
    expect(await response.text()).toBe("auth-ok");
    expect(runtime.handleAuthRequest).toHaveBeenCalledTimes(1);
  });

  it("does not route requests outside /api/auth/* to Better Auth", async () => {
    const runtime = fakeRuntime();
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime,
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/sign-in/email", { method: "POST" });

    expect(response.status).toBe(404);
    expect(runtime.handleAuthRequest).not.toHaveBeenCalled();
  });

  it("returns the anonymous principal shape with no-store caching", async () => {
    const runtime = fakeRuntime({
      resolvePrincipal: vi.fn().mockResolvedValue(ANONYMOUS_PRINCIPAL),
    });
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime,
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/v1/principal");

    expect(response.status).toBe(200);
    expect(await response.json()).toEqual({ kind: "anonymous" });
    expect(response.headers.get("cache-control")).toBe("no-store");
    expect(response.headers.get("vary")).toContain("Cookie");
  });

  it("returns the authenticated principal shape containing only kind and userId", async () => {
    const runtime = fakeRuntime({
      resolvePrincipal: vi.fn().mockResolvedValue(createAuthenticatedPrincipal("user_123")),
    });
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime,
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/v1/principal");
    const body = (await response.json()) as Record<string, unknown>;

    expect(response.status).toBe(200);
    expect(body).toEqual({ kind: "authenticated", userId: "user_123" });
    expect(Object.keys(body).sort()).toEqual(["kind", "userId"]);
  });

  it("returns a stable sanitized 503 when principal resolution fails, never a false anonymous 200", async () => {
    const runtime = fakeRuntime({
      resolvePrincipal: vi
        .fn()
        .mockRejectedValue(new IdentityRuntimeError("PRINCIPAL_RESOLUTION_FAILED")),
    });
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime,
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/v1/principal");

    expect(response.status).toBe(503);
    expect(await response.json()).toEqual({ code: "PRINCIPAL_RESOLUTION_FAILED" });
    expect(response.headers.get("cache-control")).toBe("no-store");
  });

  it("returns a stable sanitized 500 for an unexpected auth-handler failure, never a raw message", async () => {
    const runtime = fakeRuntime({
      handleAuthRequest: vi.fn().mockRejectedValue(new Error("postgresql://admin:secret@db/x")),
    });
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime,
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/auth/sign-in/email", { method: "POST" });
    const body = await response.json();

    expect(response.status).toBe(500);
    expect(body).toEqual({ code: "INTERNAL_ERROR" });
    expect(JSON.stringify(body)).not.toContain("secret");
    expect(JSON.stringify(body)).not.toContain("postgresql://");
  });

  it("has deterministic 404 behavior for an unknown route", async () => {
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime: fakeRuntime(),
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/does-not-exist");

    expect(response.status).toBe(404);
    expect(await response.json()).toEqual({ code: "NOT_FOUND" });
  });

  it("reflects an allowed origin in Access-Control-Allow-Origin with credentials support", async () => {
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime: fakeRuntime(),
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/v1/principal", {
      headers: { origin: trustedOrigin },
    });

    expect(response.headers.get("access-control-allow-origin")).toBe(trustedOrigin);
    expect(response.headers.get("access-control-allow-credentials")).toBe("true");
  });

  it("never returns Access-Control-Allow-Origin for a disallowed origin", async () => {
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime: fakeRuntime(),
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/v1/principal", {
      headers: { origin: untrustedOrigin },
    });

    expect(response.headers.get("access-control-allow-origin")).toBeNull();
  });

  it("supports requests with no Origin header at all (native/server clients)", async () => {
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime: fakeRuntime(),
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/v1/principal");

    expect(response.status).toBe(200);
  });

  it("handles preflight OPTIONS requests deterministically for an allowed origin", async () => {
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime: fakeRuntime(),
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/v1/principal", {
      headers: {
        "access-control-request-method": "GET",
        origin: trustedOrigin,
      },
      method: "OPTIONS",
    });

    expect(response.status).toBe(204);
    expect(response.headers.get("access-control-allow-origin")).toBe(trustedOrigin);
  });

  it("never wildcards Access-Control-Allow-Origin", async () => {
    const app = createApiApp({
      authorization: fakeAuthorization({}),
      runtime: fakeRuntime(),
      trustedOrigins: [trustedOrigin],
    });

    const response = await app.request("/api/v1/principal", {
      headers: { origin: trustedOrigin },
    });

    expect(response.headers.get("access-control-allow-origin")).not.toBe("*");
  });

  // Unlike Better Auth's own documented Hono example (which hydrates `c.set("user", session.user)`
  // on every request), createApiApp only ever calls `c.set` once, for the narrow EkklesiaPrincipal
  // (kind + userId only), and only on routes `requirePermission` actually protects — proven by the
  // grants-routes tests, not by a black-box context probe here. `/api/v1/principal` itself still
  // never touches `c.set`; its response shape is asserted directly above.

  describe("grants routes mounting (see grants-routes.test.ts for full coverage)", () => {
    it("mounts the v1 grants routes under /api/v1/grants", async () => {
      const evaluatorAuthorize = vi.fn().mockResolvedValue({ allowed: false });
      const app = createApiApp({
        authorization: fakeAuthorization({ evaluator: { authorize: evaluatorAuthorize } }),
        runtime: fakeRuntime(),
        trustedOrigins: [trustedOrigin],
      });

      const response = await app.request("/api/v1/grants?userId=user_123");

      // Reaching the permission check (and being denied by it) proves the route is mounted and
      // wired to the injected evaluator, rather than falling through to the 404 handler.
      expect(response.status).toBe(403);
      expect(evaluatorAuthorize).toHaveBeenCalledTimes(1);
    });

    it("applies the same CORS policy to /api/v1/grants as the rest of /api/v1/*", async () => {
      const app = createApiApp({
        authorization: fakeAuthorization({}),
        runtime: fakeRuntime(),
        trustedOrigins: [trustedOrigin],
      });

      const response = await app.request("/api/v1/grants?userId=user_123", {
        headers: { origin: untrustedOrigin },
      });

      expect(response.headers.get("access-control-allow-origin")).toBeNull();
    });
  });
});