FileSystemBaseHandle-postMessage-BroadcastChannel.js

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'use strict';

// This script depends on the following scripts:

//    /fs/resources/messaging-helpers.js

//    /fs/resources/messaging-serialize-helpers.js

//    /fs/resources/test-helpers.js

//    /service-workers/service-worker/resources/test-helpers.sub.js

// Sets up a new broadcast channel in |target|. Posts a message instructing

// |target| to open the broadcast channel using |broadcast_channel_name|.

async function create_broadcast_channel(

  test, broadcast_channel_name, receiver, target, target_origin) {

  target.postMessage(

    { type: 'create-broadcast-channel', broadcast_channel_name },

    { targetOrigin: target_origin });

  const event_watcher = new EventWatcher(test, receiver, 'message');

  // Wait until |target| is listening to the broad cast channel.

  const message_event = await event_watcher.wait_for('message');

  assert_equals(message_event.data.type, 'broadcast-channel-created',

    'The message target must receive a "broadcast-channel-created" message ' +

    'response.');

// This test is very similar to 'FileSystemBaseHandle-postMessage.js'. It

// starts by creating three message targets for the broadcast channel:

// an iframe, dedicated worker and a service worker. After setup, an array

// of FileSystemHandles is sent across the broadcast channel. The test

// expects three responses -- one from each message target.

directory_test(async (t, root) => {

  const broadcast_channel_name = 'file-system-file-handle-channel';

  const broadcast_channel = new BroadcastChannel(broadcast_channel_name);

  const broadcast_channel_event_watcher =

    new EventWatcher(t, broadcast_channel, 'message');

  const iframe = await add_iframe(t, { src: kDocumentMessageTarget });

  await create_broadcast_channel(

    t, broadcast_channel_name, self, iframe.contentWindow, '*');

  const scope = `${kServiceWorkerMessageTarget}` +

    '?post-message-to-broadcast-channel-with-file-handle';

  const registration = await create_service_worker(

    t, kServiceWorkerMessageTarget, scope);

  await create_broadcast_channel(

    t, broadcast_channel_name,

    navigator.serviceWorker, registration.installing);

  const dedicated_worker =

    create_dedicated_worker(t, kDedicatedWorkerMessageTarget);

  await create_broadcast_channel(

    t, broadcast_channel_name, dedicated_worker, dedicated_worker);

  const handles = await create_file_system_handles(t, root);

  broadcast_channel.postMessage(

    { type: 'receive-file-system-handles', cloned_handles: handles });

  const expected_response_count = 3;

  const responses = [];

  for (let i = 0; i < expected_response_count; ++i) {

    const message_event =

      await broadcast_channel_event_watcher.wait_for('message');

    responses.push(message_event.data);

  const expected_serialized_handles = await serialize_handles(handles);

  for (let i = 0; i < responses.length; ++i) {

    assert_equals(responses[i].type, 'receive-serialized-file-system-handles',

      'The test runner must receive a "serialized-file-system-handles" ' +

      `message response. Actual response: ${responses[i]}`);

    assert_equals_serialized_handles(

      responses[i].serialized_handles, expected_serialized_handles);

    await assert_equals_cloned_handles(responses[i].cloned_handles, handles);

}, 'Send and receive messages using a broadcast channel in an iframe, ' +

'dedicated worker and service worker.');