tech-log-frontend/tests/unit/browser-file-runtime.test.ts

// @vitest-environment jsdom

import { describe, expect, it, vi } from "vitest";

import type {
  FileVerificationReceipt,
  LocalFileRef,
} from "../../src/application/ports/browser-file-storage/file.ts";
import {
  browserFilePolicyReference,
  createBrowserFileRuntime,
  type BrowserFilePolicyProfile,
} from "../../src/adapters/browser-files/index.ts";

const filePolicy = browserFilePolicyReference(
  "runtime-file",
  "select-and-preview",
);
const downloadPolicy = browserFilePolicyReference(
  "runtime-download",
  "bounded-generated-bin",
);
const policies: readonly BrowserFilePolicyProfile[] = [
  {
    reference: filePolicy,
    selection: {
      policyId: "attachment-v1",
      purpose: "attachment",
      classification: "PERSONAL",
      multiple: false,
      maxCount: 1,
      maxFileBytes: 8,
      maxTotalBytes: 8,
      allowEmpty: false,
      accept: [{ mediaType: "text/plain", extensions: [".txt"] }],
    },
    inspection: {
      policyId: "preview-v1",
      maxInspectionBytes: 8,
      acceptedSignatures: [
        {
          mediaType: "image/png",
          extensions: [".png"],
          patterns: [{ offset: 0, bytes: [0x89] }],
        },
      ],
    },
    preview: {
      allowedMediaTypes: ["image/png"],
      maxPreviewBytes: 8,
    },
  },
  {
    reference: downloadPolicy,
    download: {
      strategy: "BOUNDED_OBJECT_URL",
      mediaType: "application/octet-stream",
      safeExtension: ".bin",
      maxTransferBytes: 8,
      maxBufferedBytes: 8,
      integrity: "OPTIONAL",
    },
  },
];
const unusedBrowserManagedCapabilities = {
  resolve() {
    return {
      ok: false as const,
      error: {
        code: "POLICY_REJECTED" as const,
        operation: "DOWNLOAD" as const,
        retryable: false,
        recovery: "NONE" as const,
      },
    };
  },
};

function fileInput(): HTMLInputElement {
  const label = document.createElement("label");
  label.textContent = "Attachment";
  const input = document.createElement("input");
  input.type = "file";
  label.append(input);
  document.body.append(label);
  return input;
}

describe("browser file runtime hard limits and disposal", () => {
  it("revokes active download leases immediately on runtime dispose", async () => {
    const revoked: string[] = [];
    let scheduled: (() => void) | undefined;
    const runtime = createBrowserFileRuntime({
      input: fileInput(),
      policies,
      limits: {
        hardMaxPreviewBytes: 8,
        hardMaxObjectUrlBytes: 8,
        hardMaxTransferBytes: 16,
      },
      objectUrlApi: {
        createObjectURL: () => "blob:runtime-download",
        revokeObjectURL: (url) => revoked.push(url),
      },
      download: {
        host: { handoff: vi.fn() },
        browserManagedCapabilities:
          unusedBrowserManagedCapabilities,
        scheduler: {
          setTimeout(callback) {
            scheduled = callback;
            return 1;
          },
        },
      },
    });

    const delivery = {
        policy: downloadPolicy,
        source: {
          kind: "GENERATED" as const,
          bytes: {
            byteLength: 3,
            async *stream() {
              yield {
                ok: true as const,
                value: new Uint8Array([1, 2, 3]),
              };
            },
          },
        },
        suggestedFileName: "artifact",
        maxTransferBytes: 8,
        maxBufferedBytes: 8,
        signal: new AbortController().signal,
        onProgress() {},
      };
    expect(await runtime.downloads.deliver(delivery)).toMatchObject({
      ok: true,
      value: { kind: "BROWSER_HANDOFF" },
    });
    expect(revoked).toEqual([]);

    runtime.dispose();
    expect(revoked).toEqual(["blob:runtime-download"]);
    expect(await runtime.downloads.deliver(delivery)).toMatchObject({
      ok: false,
      error: { code: "UNAVAILABLE" },
    });
    expect(
      await runtime.content.readRange({
        ref: "file:disposed" as LocalFileRef,
        offset: 0,
        length: 0,
        signal: new AbortController().signal,
      }),
    ).toMatchObject({
      ok: false,
      error: { code: "UNAVAILABLE" },
    });
    expect(
      await runtime.previews.create({
        ref: "file:disposed" as LocalFileRef,
        verificationReceipt:
          "verification:disposed" as FileVerificationReceipt,
        policy: filePolicy,
        maxPreviewBytes: 1,
        signal: new AbortController().signal,
      }),
    ).toMatchObject({
      ok: false,
      error: { code: "UNAVAILABLE" },
    });
    scheduled?.();
    runtime.dispose();
    expect(revoked).toEqual(["blob:runtime-download"]);
  });

  it("aborts a pending native picker and prevents event resurrection", async () => {
    const input = fileInput();
    Object.defineProperty(input, "showPicker", {
      configurable: true,
      value: vi.fn(),
    });
    const runtime = createBrowserFileRuntime({
      input,
      policies,
      limits: {
        hardMaxPreviewBytes: 8,
        hardMaxObjectUrlBytes: 8,
        hardMaxTransferBytes: 16,
      },
      vault: {
        createReference: () => "file:must-not-exist",
      },
      download: {
        host: { handoff() {} },
        browserManagedCapabilities:
          unusedBrowserManagedCapabilities,
      },
    });
    const pending = runtime.baselinePicker.select({
      policy: filePolicy,
    });

    runtime.dispose();
    expect(await pending).toMatchObject({
      ok: false,
      error: { code: "ABORTED" },
    });
    Object.defineProperty(input, "files", {
      configurable: true,
      value: [
        new File(["late"], "late.txt", {
          type: "text/plain",
          lastModified: 1,
        }),
      ],
    });
    input.dispatchEvent(new Event("change"));
    expect(
      await runtime.baselinePicker.select({
        policy: filePolicy,
      }),
    ).toMatchObject({
      ok: false,
      error: { code: "UNAVAILABLE" },
    });
  });

  it("aborts a generated download whose producer ignores cancellation", async () => {
    let reportStarted: (() => void) | undefined;
    const started = new Promise<void>((resolve) => {
      reportStarted = resolve;
    });
    let unblockProducer: (() => void) | undefined;
    const producerBlock = new Promise<void>((resolve) => {
      unblockProducer = resolve;
    });
    const runtime = createBrowserFileRuntime({
      input: fileInput(),
      policies,
      limits: {
        hardMaxPreviewBytes: 8,
        hardMaxObjectUrlBytes: 8,
        hardMaxTransferBytes: 16,
      },
      download: {
        host: { handoff() {} },
        browserManagedCapabilities:
          unusedBrowserManagedCapabilities,
      },
    });
    const pending = runtime.downloads.deliver({
      policy: downloadPolicy,
      source: {
        kind: "GENERATED",
        bytes: {
          byteLength: 1,
          async *stream() {
            reportStarted?.();
            await producerBlock;
            yield {
              ok: true as const,
              value: new Uint8Array([1]),
            };
          },
        },
      },
      suggestedFileName: "blocked",
      maxTransferBytes: 8,
      maxBufferedBytes: 8,
      signal: new AbortController().signal,
      onProgress() {},
    });

    await started;
    runtime.dispose();
    expect(await pending).toMatchObject({
      ok: false,
      error: { code: "ABORTED", operation: "DOWNLOAD" },
    });
    unblockProducer?.();
  });

  it("rejects inconsistent absolute limits during composition", () => {
    expect(() =>
      createBrowserFileRuntime({
        input: fileInput(),
        policies,
        limits: {
          hardMaxPreviewBytes: 8,
          hardMaxObjectUrlBytes: 17,
          hardMaxTransferBytes: 16,
        },
        download: {
          host: { handoff() {} },
          browserManagedCapabilities:
            unusedBrowserManagedCapabilities,
        },
      }),
    ).toThrowError("Browser file runtime hard limits are invalid.");
  });
});