Ekklesia/apps/api/tests/module-ui-routes.test.ts

import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import path from "node:path";
import {
  ANONYMOUS_PRINCIPAL,
  type ModuleDatabase,
  type ModuleRuntimeServices,
} from "@ekklesia/contracts";
import {
  type AuthorizationEvaluator,
  type AuthorizationStore,
  CORE_PERMISSION_REGISTRY,
} from "@ekklesia/core/authorization";
import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
import {
  createModuleUiPublicationRegistry,
  type DiscoveredModule,
  discoverModules,
} from "@ekklesia/core/modules";
import { loadModuleUi } from "@ekklesia/module-ui-host";
import type { Hono } from "hono";
import { afterEach, describe, expect, it, vi } from "vitest";
import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
import { createApiApp } from "../src/app.js";
import {
  MODULE_UI_ASSET_PREFIX,
  MODULE_UI_CACHE_CONTROL,
  MODULE_UI_CONTENT_TYPE,
  moduleUiArtifactUrl,
} from "../src/module-ui-routes.js";

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

const temporaryDirectories: string[] = [];

afterEach(async () => {
  await Promise.all(
    temporaryDirectories
      .splice(0)
      .map((directory) => rm(directory, { force: true, recursive: true })),
  );
});

async function createModulesDirectory(): Promise<string> {
  const directory = await mkdtemp(path.join(tmpdir(), "ekklesia-api-ui-publication-"));
  temporaryDirectories.push(directory);
  return directory;
}

/** A real, loadable module UI artifact: a valid `ModuleUiDefinition` default export, written as
 * plain ESM. `@ekklesia/module-ui-build` already proves the esbuild pipeline emits this shape
 * (`packages/module-ui-host/tests/real-artifact.test.ts`); what these tests need is a byte
 * sequence whose exact publication and loader-compatibility can be asserted. */
function artifactSource(id: string, version: string): string {
  return `export default {
  id: ${JSON.stringify(id)},
  version: ${JSON.stringify(version)},
  mount(container, context) {
    container.textContent = context.moduleId + ":mounted";
    return () => {
      container.textContent = "";
    };
  },
};
`;
}

interface ModuleFixture {
  readonly id: string;
  readonly version?: string;
  /** Written to `dist/ui/index.js` and declared as `entrypoints.ui`. Omit for a backend-only
   * module, whose manifest then declares no UI entrypoint at all. */
  readonly ui?: string;
  /** Extra package-relative files written alongside the artifact — a source map, a sibling bundle
   * chunk, an operator secret — so "only the declared artifact is reachable" is asserted against
   * files that genuinely exist on disk rather than against hypothetical ones. */
  readonly extraFiles?: Readonly<Record<string, string>>;
}

async function createModule(modulesDirectory: string, fixture: ModuleFixture): Promise<void> {
  const version = fixture.version ?? "0.1.0";
  const moduleDirectory = path.join(modulesDirectory, fixture.id);
  await mkdir(path.join(moduleDirectory, "dist/server"), { recursive: true });
  await writeFile(
    path.join(moduleDirectory, "package.json"),
    JSON.stringify({
      ekklesia: { layer: "module" },
      name: `@test/module-${fixture.id}`,
      type: "module",
      version,
    }),
  );
  await writeFile(
    path.join(moduleDirectory, "ekklesia.module.json"),
    JSON.stringify({
      compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
      entrypoints: {
        server: "./dist/server/index.js",
        ...(fixture.ui === undefined ? {} : { ui: "./dist/ui/index.js" }),
      },
      id: fixture.id,
      manifestVersion: 4,
      name: `${fixture.id} module`,
      version,
    }),
  );
  await writeFile(
    path.join(moduleDirectory, "dist/server/index.js"),
    `export default { id: ${JSON.stringify(fixture.id)}, version: ${JSON.stringify(version)} };`,
  );
  if (fixture.ui !== undefined) {
    await mkdir(path.join(moduleDirectory, "dist/ui"), { recursive: true });
    await writeFile(path.join(moduleDirectory, "dist/ui/index.js"), fixture.ui);
  }
  for (const [relativePath, contents] of Object.entries(fixture.extraFiles ?? {})) {
    const target = path.join(moduleDirectory, relativePath);
    await mkdir(path.dirname(target), { recursive: true });
    await writeFile(target, contents);
  }
}

interface Installation {
  readonly app: Hono;
  readonly modules: readonly DiscoveredModule[];
  readonly modulesDirectory: string;
}

/**
 * A real installation: fixtures on disk, Core's real `discoverModules` (manifest validation,
 * compiled-artifact validation, package containment, symlink canonicalization), Core's real
 * publication registry, and the real `createApiApp`. Nothing about the publication policy or the
 * artifact path is hand-built, so these tests exercise the actual security boundary rather than a
 * reconstruction of it.
 */
async function install(fixtures: readonly ModuleFixture[]): Promise<Installation> {
  const modulesDirectory = await createModulesDirectory();
  for (const fixture of fixtures) {
    await createModule(modulesDirectory, fixture);
  }
  const modules = await discoverModules({
    moduleSdkVersion: "0.1.0",
    modulesDirectory,
    platformVersion: "0.1.0",
  });

  const database = Object.freeze({}) as unknown as ModuleDatabase;
  const services: ModuleRuntimeServices = Object.freeze({ database });
  const runtime: EkklesiaIdentityRuntime = {
    handleAuthRequest: vi.fn().mockResolvedValue(new Response(null, { status: 200 })),
    // Anonymous, and every authorization decision denied: whatever this route does, it does it
    // without a session and without a single permission.
    resolvePrincipal: vi.fn().mockResolvedValue(ANONYMOUS_PRINCIPAL),
  };
  const evaluator: AuthorizationEvaluator = {
    authorize: vi.fn().mockResolvedValue({ allowed: false }),
  };
  const store = {
    createGrant: vi.fn(),
    grantPlatformOwner: vi.fn(),
    hasActiveGrant: vi.fn().mockResolvedValue(false),
    isPlatformOwner: vi.fn().mockResolvedValue(false),
    listGrantsForUser: vi.fn().mockResolvedValue({ grants: [] }),
    revokeGrant: vi.fn(),
    revokePlatformOwner: vi.fn(),
  } as unknown as AuthorizationStore;

  const app = createApiApp({
    authorization: { evaluator, registry: CORE_PERMISSION_REGISTRY, store },
    moduleRoutes: Object.freeze([]),
    moduleServices: services,
    moduleUi: createModuleUiPublicationRegistry(modules),
    dashboard: createInMemoryDashboardStore(),
    runtime,
    trustedOrigins: [trustedOrigin],
  });

  return { app, modules, modulesDirectory };
}

describe("module UI artifact publication — happy path", () => {
  it("serves the declared artifact byte-for-byte at the canonical URL", async () => {
    const source = artifactSource("announcements", "1.4.2");
    const { app } = await install([{ id: "announcements", ui: source, version: "1.4.2" }]);

    const response = await app.request(
      moduleUiArtifactUrl({ moduleId: "announcements", version: "1.4.2" }),
    );

    expect(response.status).toBe(200);
    expect(await response.text()).toBe(source);
  });

  it("serves it as ES module JavaScript, with sniffing disabled", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);

    const response = await app.request(
      moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" }),
    );

    expect(response.headers.get("content-type")).toBe(MODULE_UI_CONTENT_TYPE);
    expect(response.headers.get("x-content-type-options")).toBe("nosniff");
  });

  it("revalidates rather than promising immutability the platform cannot enforce", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);

    const response = await app.request(
      moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" }),
    );

    expect(response.headers.get("cache-control")).toBe(MODULE_UI_CACHE_CONTROL);
    // A reused version can be rebuilt with different bytes, so neither of these may ever appear.
    expect(response.headers.get("cache-control")).not.toContain("immutable");
    expect(response.headers.get("cache-control")).not.toContain("max-age");
    // A strong validator (no `W/` prefix), so the revalidation above is actually decidable.
    expect(response.headers.get("etag")).toMatch(/^"[A-Za-z0-9_-]+"$/u);
  });

  it("varies on Origin, so a shared cache cannot reuse one origin's CORS response for another", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);

    const response = await app.request(
      moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" }),
      { headers: { origin: trustedOrigin } },
    );

    expect(response.headers.get("access-control-allow-origin")).toBe(trustedOrigin);
    expect(response.headers.get("vary")?.toLowerCase()).toContain("origin");
  });

  it("answers a matching conditional request with 304 and no body", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);
    const url = moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" });
    const etag = (await app.request(url)).headers.get("etag") as string;

    const revalidated = await app.request(url, { headers: { "if-none-match": etag } });

    expect(revalidated.status).toBe(304);
    expect(await revalidated.text()).toBe("");
    expect(revalidated.headers.get("etag")).toBe(etag);
    expect(revalidated.headers.get("cache-control")).toBe(MODULE_UI_CACHE_CONTROL);
  });

  it("applies RFC 9110 weak comparison and the wildcard, and refuses a stale validator", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);
    const url = moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" });
    const etag = (await app.request(url)).headers.get("etag") as string;

    const cases: ReadonlyArray<readonly [string, number]> = [
      [`W/${etag}`, 304],
      ["*", 304],
      [`"someone-elses-tag", ${etag}`, 304],
      ['"stale-tag"', 200],
      ["not a valid header at all", 200],
    ];
    for (const [header, expected] of cases) {
      const response = await app.request(url, { headers: { "if-none-match": header } });
      expect(response.status, header).toBe(expected);
    }
  });

  it("recomputes the validator from the bytes actually on disk after a same-version rebuild", async () => {
    const { app, modulesDirectory } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);
    const url = moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" });
    const first = await app.request(url);
    const firstEtag = first.headers.get("etag");

    // Exactly the develop-in-place case an `immutable` policy would have made unrecoverable.
    const rebuilt = `${artifactSource("announcements", "0.1.0")}// rebuilt\n`;
    await writeFile(path.join(modulesDirectory, "announcements/dist/ui/index.js"), rebuilt);

    const second = await app.request(url, { headers: { "if-none-match": firstEtag as string } });

    expect(second.status).toBe(200);
    expect(await second.text()).toBe(rebuilt);
    expect(second.headers.get("etag")).not.toBe(firstEtag);
  });

  it("serves the artifact without executing it, even when its top level throws", async () => {
    const exploding = 'throw new Error("module UI must never be evaluated on the server");\n';
    const { app } = await install([{ id: "announcements", ui: exploding }]);

    const response = await app.request(
      moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" }),
    );

    expect(response.status).toBe(200);
    expect(await response.text()).toBe(exploding);
  });

  it("requires no authentication, by deliberate decision", async () => {
    // The installation's identity runtime resolves an anonymous principal and its evaluator denies
    // every permission. If this route ever grows an authentication or authorization requirement,
    // this test is the one that must be consciously changed.
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);

    const response = await app.request(
      moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" }),
    );

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

  it("still refuses a protected platform API to the same anonymous caller", async () => {
    // Publication grants no authority: the very same caller that just downloaded the bundle is
    // still denied every permission-protected route.
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);

    expect(
      (await app.request(moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" })))
        .status,
    ).toBe(200);
    const grants = await app.request("/api/v1/grants?userId=someone");
    expect(grants.status).toBe(403);
  });
});

describe("module UI artifact publication — module identity", () => {
  async function expectNotPublished(app: Hono, url: string): Promise<void> {
    const response = await app.request(url);
    expect(response.status).toBe(404);
    expect(await response.json()).toEqual({ code: "MODULE_UI_NOT_PUBLISHED" });
  }

  it("refuses a module that is not installed", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);

    await expectNotPublished(app, moduleUiArtifactUrl({ moduleId: "calendar", version: "0.1.0" }));
  });

  it("refuses an installed module that declares no UI entrypoint", async () => {
    const { app } = await install([{ id: "calendar" }]);

    await expectNotPublished(app, moduleUiArtifactUrl({ moduleId: "calendar", version: "0.1.0" }));
  });

  it("refuses a version other than the installed one rather than serving what exists", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "1.4.2"), version: "1.4.2" },
    ]);

    for (const version of ["1.4.1", "1.4.3", "1.4", "latest", "^1.4.2"]) {
      await expectNotPublished(app, moduleUiArtifactUrl({ moduleId: "announcements", version }));
    }
    expect(
      (await app.request(moduleUiArtifactUrl({ moduleId: "announcements", version: "1.4.2" })))
        .status,
    ).toBe(200);
  });

  it("makes unknown module, no UI, and wrong version indistinguishable", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "1.4.2"), version: "1.4.2" },
      { id: "calendar" },
    ]);

    const responses = await Promise.all(
      [
        moduleUiArtifactUrl({ moduleId: "signage", version: "1.4.2" }),
        moduleUiArtifactUrl({ moduleId: "calendar", version: "0.1.0" }),
        moduleUiArtifactUrl({ moduleId: "announcements", version: "9.9.9" }),
      ].map(async (url) => {
        const response = await app.request(url);
        return { body: await response.text(), status: response.status };
      }),
    );

    // An anonymous caller must not be able to use the distinction to enumerate an installation.
    expect(new Set(responses.map((entry) => `${entry.status}:${entry.body}`)).size).toBe(1);
  });

  it("never serves one module's artifact under another module's identity", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
      { id: "signage", ui: artifactSource("signage", "0.1.0") },
    ]);

    const announcements = await app.request(
      moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" }),
    );
    const signage = await app.request(
      moduleUiArtifactUrl({ moduleId: "signage", version: "0.1.0" }),
    );

    expect(await announcements.text()).toContain('"announcements"');
    expect(await signage.text()).toContain('"signage"');
  });
});

describe("module UI artifact publication — filesystem exposure", () => {
  const sourceMap =
    '{"version":3,"sources":["../../src/ui/index.tsx"],"sourcesContent":["secret"]}';

  /** One installation carrying every kind of file a wildcard route would have leaked. */
  async function installWithNeighbours(): Promise<Installation> {
    return install([
      {
        extraFiles: {
          ".env": "EKKLESIA_IDENTITY_SECRET=super-secret\n",
          "dist/server/index.js.map": sourceMap,
          "dist/ui/index.js.map": sourceMap,
          "dist/ui/internal-chunk.js": "export const internal = 1;\n",
        },
        id: "announcements",
        ui: artifactSource("announcements", "0.1.0"),
      },
    ]);
  }

  it("exposes no path shape beyond the two identity segments", async () => {
    const { app } = await installWithNeighbours();
    const base = `${MODULE_UI_ASSET_PREFIX}/announcements`;

    const unreachable = [
      // Source maps: real files, sitting right next to the published artifact.
      `${base}/0.1.0.map`,
      `${base}/0.1.0/index.js.map`,
      `${base}/0.1.0/dist/ui/index.js.map`,
      // Sibling bundle output and package-root files.
      `${base}/0.1.0/internal-chunk.js`,
      `${base}/0.1.0/package.json`,
      `${base}/0.1.0/ekklesia.module.json`,
      `${base}/0.1.0/.env`,
      // A trailing segment of any kind, including an empty one.
      `${base}/0.1.0/`,
      `${base}/0.1.0/anything`,
      // Fewer segments than the route declares. The collection root itself is deliberately absent
      // from this list: it is the authenticated inventory (ADR 0026) rather than a 404, and is
      // asserted separately below.
      base,
    ];

    for (const url of unreachable) {
      const response = await app.request(url);
      expect(response.status, url).toBe(404);
      // Nothing leaks: not the artifact, not a neighbour, not a path.
      const body = await response.text();
      expect(body, url).not.toContain("secret");
      expect(body, url).not.toContain("internal");
      expect(body, url).not.toContain("mount");
    }
  });

  it("serves no artifact bytes from the collection root, which is the authenticated inventory", async () => {
    const { app } = await installWithNeighbours();

    // `/api/v1/module-ui` lists what a host may mount (ADR 0026) and requires
    // `core.modules.ui.read`; this installation's caller is anonymous, so it is refused. Either way
    // it never yields a byte of any artifact or neighbouring file.
    const response = await app.request(MODULE_UI_ASSET_PREFIX);
    const body = await response.text();

    expect(response.status).toBe(403);
    expect(body).not.toContain("mount");
    expect(body).not.toContain("secret");
    expect(body).not.toContain("internal");
  });

  it("treats a traversal attempt as an ordinary failed lookup", async () => {
    const { app } = await installWithNeighbours();

    const attempts = [
      `${MODULE_UI_ASSET_PREFIX}/..%2F..%2F..%2Fetc%2Fpasswd/0.1.0`,
      `${MODULE_UI_ASSET_PREFIX}/announcements/..%2F..%2Fpackage.json`,
      `${MODULE_UI_ASSET_PREFIX}/announcements%2Fdist%2Fui%2Findex.js/0.1.0`,
      `${MODULE_UI_ASSET_PREFIX}/${encodeURIComponent("../announcements")}/0.1.0`,
      `${MODULE_UI_ASSET_PREFIX}/announcements/${encodeURIComponent("0.1.0/../../.env")}`,
      `${MODULE_UI_ASSET_PREFIX}/announcements/${encodeURIComponent("0.1.0 .map")}`,
    ];

    for (const url of attempts) {
      const response = await app.request(url);
      expect(response.status, url).toBe(404);
      expect(await response.text(), url).not.toContain("secret");
    }
  });

  it("keeps an absolute filesystem path from ever becoming a request parameter that works", async () => {
    const { app, modules } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);
    const artifactPath = (modules[0] as DiscoveredModule).entrypoints.ui as string;

    const response = await app.request(
      `${MODULE_UI_ASSET_PREFIX}/${encodeURIComponent(artifactPath)}/0.1.0`,
    );

    expect(response.status).toBe(404);
  });
});

describe("module UI artifact publication — request surface", () => {
  it("is read-only: no other method is routed at all", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);
    const url = moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" });

    for (const method of ["POST", "PUT", "PATCH", "DELETE"]) {
      const response = await app.request(url, { method });
      expect(response.status, method).toBe(404);
      expect(await response.json(), method).toEqual({ code: "NOT_FOUND" });
    }
  });

  it("answers HEAD with the full header contract and no body", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);
    const url = moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" });

    const response = await app.request(url, { method: "HEAD" });

    expect(response.status).toBe(200);
    expect(response.headers.get("content-type")).toBe(MODULE_UI_CONTENT_TYPE);
    expect(response.headers.get("etag")).toBe((await app.request(url)).headers.get("etag"));
    expect(await response.text()).toBe("");
  });

  it("fails closed on malformed percent-encoding instead of throwing", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);

    for (const url of [
      `${MODULE_UI_ASSET_PREFIX}/%zz/0.1.0`,
      `${MODULE_UI_ASSET_PREFIX}/announcements/%E0%A4%A`,
      `${MODULE_UI_ASSET_PREFIX}/a%00b/0.1.0`,
    ]) {
      const response = await app.request(url);
      // An ordinary refused lookup, never a 500 that would reveal a decoding failure.
      expect(response.status, url).toBe(404);
      expect(await response.json(), url).toEqual({ code: "MODULE_UI_NOT_PUBLISHED" });
    }
  });
});

describe("module UI artifact publication — artifact changed after discovery", () => {
  it("reports a sanitized 503 when the validated artifact has been deleted", async () => {
    const { app, modulesDirectory } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);
    const url = moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" });
    expect((await app.request(url)).status).toBe(200);

    await rm(path.join(modulesDirectory, "announcements/dist/ui/index.js"));

    const response = await app.request(url);

    expect(response.status).toBe(503);
    expect(await response.json()).toEqual({ code: "MODULE_UI_ARTIFACT_UNAVAILABLE" });
  });

  it("leaks no filesystem detail when the artifact is unreadable", async () => {
    const { app, modulesDirectory } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);
    const artifact = path.join(modulesDirectory, "announcements/dist/ui/index.js");
    await rm(artifact);
    // Replaced by a directory: a different `errno` (EISDIR) on the same validated path.
    await mkdir(artifact);

    const response = await app.request(
      moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" }),
    );
    const body = await response.text();

    expect(response.status).toBe(503);
    expect(body).not.toContain(modulesDirectory);
    expect(body).not.toContain(tmpdir());
    expect(body).not.toContain("dist");
    expect(body).not.toContain("EISDIR");
    expect(response.headers.get("cache-control")).toBe("no-store");
  });

  it("never falls back to a reconstructed path when the exact artifact is gone", async () => {
    const { app, modulesDirectory } = await install([
      { id: "announcements", ui: artifactSource("announcements", "0.1.0") },
    ]);
    const moduleDirectory = path.join(modulesDirectory, "announcements");
    await rm(path.join(moduleDirectory, "dist/ui/index.js"));
    // Plausible neighbours a path-guessing implementation might land on instead.
    await writeFile(path.join(moduleDirectory, "dist/ui/index.mjs"), "export default {};\n");
    await writeFile(path.join(moduleDirectory, "dist/index.js"), "export default {};\n");

    const response = await app.request(
      moduleUiArtifactUrl({ moduleId: "announcements", version: "0.1.0" }),
    );

    expect(response.status).toBe(503);
  });
});

describe("module UI artifact URL generation", () => {
  it("agrees with the route it is generated for", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "1.4.2"), version: "1.4.2" },
    ]);

    const url = moduleUiArtifactUrl({ moduleId: "announcements", version: "1.4.2" });

    expect(url).toBe(`${MODULE_UI_ASSET_PREFIX}/announcements/1.4.2`);
    expect((await app.request(url)).status).toBe(200);
  });

  it("is root-relative, so a host resolves it against whichever API origin it is configured for", () => {
    const url = moduleUiArtifactUrl({ moduleId: "announcements", version: "1.4.2" });

    expect(url.startsWith("/")).toBe(true);
    expect(new URL(url, "https://ekklesia.example.test").href).toBe(
      `https://ekklesia.example.test${MODULE_UI_ASSET_PREFIX}/announcements/1.4.2`,
    );
    // A split-origin host resolves the identical value against its own API base.
    expect(new URL(url, "http://127.0.0.1:3000").href).toBe(
      `http://127.0.0.1:3000${MODULE_UI_ASSET_PREFIX}/announcements/1.4.2`,
    );
  });

  it("encodes hostile input instead of letting it restructure the URL", () => {
    const hostile = [
      "../../etc/passwd",
      "announcements/dist/ui/index.js",
      "announcements?x=1",
      "announcements#fragment",
      "announcements ",
      "a b",
    ];

    for (const value of hostile) {
      // Still exactly the prefix's own segments plus one for the module and one for the version.
      const expectedSegments = MODULE_UI_ASSET_PREFIX.split("/").length + 2;
      const moduleUrl = moduleUiArtifactUrl({ moduleId: value, version: "0.1.0" });
      expect(moduleUrl.split("/"), value).toHaveLength(expectedSegments);
      expect(moduleUrl.includes("?"), value).toBe(false);
      expect(moduleUrl.includes("#"), value).toBe(false);

      const versionUrl = moduleUiArtifactUrl({ moduleId: "announcements", version: value });
      expect(versionUrl.split("/"), value).toHaveLength(expectedSegments);
      expect(versionUrl.includes("?"), value).toBe(false);
      expect(versionUrl.includes("#"), value).toBe(false);
    }
  });
});

describe("module UI artifact publication — the generic loader consumes what is published", () => {
  /**
   * Node cannot `import()` an `http:` URL, so the two halves of the chain are proven separately and
   * honestly: the tests above prove the route publishes the exact artifact bytes with ES module
   * JavaScript semantics over real HTTP routing, and this one takes **those very bytes, as returned
   * by the route**, and puts them through the real `@ekklesia/module-ui-host` loader as a `data:`
   * URL — a genuine module URL, the same technique ADR 0024's own loader tests use. Nothing here
   * reads the artifact from the filesystem.
   */
  async function publishedModuleUrl(app: Hono, moduleId: string, version: string): Promise<string> {
    const response = await app.request(moduleUiArtifactUrl({ moduleId, version }));
    expect(response.status).toBe(200);
    expect(response.headers.get("content-type")).toBe(MODULE_UI_CONTENT_TYPE);
    const bytes = Buffer.from(await response.arrayBuffer());
    return `data:text/javascript;base64,${bytes.toString("base64")}`;
  }

  /**
   * The loader forwards the container untouched to the module's own `mount` and never inspects it,
   * so a plain sink is enough and no DOM implementation is required. The container's type is read
   * back off `loadModuleUi` itself rather than written as `Element`, because `apps/api` compiles
   * against Node libs only — naming a DOM type here would be the same browser/server confusion this
   * route exists to keep apart.
   */
  type LoaderContainer = Parameters<typeof loadModuleUi>[0]["container"];

  function containerSink(): { textContent: string } {
    return { textContent: "" };
  }

  function hostContext() {
    return {
      api: { request: async () => new Response(null, { status: 200 }) },
      moduleId: "announcements",
      permissions: { has: () => false },
      principal: { kind: "anonymous" as const },
    };
  }

  it("mounts and unmounts an artifact obtained from the publication route", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "1.4.2"), version: "1.4.2" },
    ]);
    const url = await publishedModuleUrl(app, "announcements", "1.4.2");
    const container = containerSink();

    const mounted = await loadModuleUi({
      container: container as unknown as LoaderContainer,
      context: hostContext(),
      source: { moduleId: "announcements", url, version: "1.4.2" },
    });

    expect(container.textContent).toBe("announcements:mounted");
    await mounted.unmount();
    expect(container.textContent).toBe("");
  });

  it("still rejects the published artifact when the host expects a different identity", async () => {
    const { app } = await install([
      { id: "announcements", ui: artifactSource("announcements", "1.4.2"), version: "1.4.2" },
    ]);
    const url = await publishedModuleUrl(app, "announcements", "1.4.2");

    await expect(
      loadModuleUi({
        container: containerSink() as unknown as LoaderContainer,
        context: hostContext(),
        source: { moduleId: "announcements", url, version: "9.9.9" },
      }),
    ).rejects.toMatchObject({ code: "MODULE_UI_IDENTITY_MISMATCH" });
  });
});