<!DOCTYPE html>
<meta charset=utf-8>
<title>Web Locks API: Frames</title>
<link rel=help href="https://w3c.github.io/web-locks/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<style>iframe { display: none; }</style>
<script>
'use strict';

promise_test(async t => {
  assert_implements(navigator.locks);
  const res = uniqueName(t);

  const frame = await iframe('resources/iframe.html');
  t.add_cleanup(() => { frame.remove(); });

  const lock_id = (await postToFrameAndWait(
    frame, {op: 'request', name: res, mode: 'shared'})).lock_id;

  await navigator.locks.request(res, {mode: 'shared'}, async lock => {
    await postToFrameAndWait(frame, {op: 'release', lock_id});
  });

}, 'Window and Frame - shared mode');

promise_test(async t => {
  assert_implements(navigator.locks);
  const res = uniqueName(t);

  const frame = await iframe('resources/iframe.html');
  t.add_cleanup(() => { frame.remove(); });

  // frame acquires the lock.
  const lock_id = (await postToFrameAndWait(
    frame, {op: 'request', name: res})).lock_id;

  // This request should be blocked.
  let lock_granted = false;
  const blocked = navigator.locks.request(res, lock => { lock_granted = true; });

  // Verify that we can't get it.
  let available = undefined;
  await navigator.locks.request(
    res, {ifAvailable: true}, lock => { available = lock !== null; });
  assert_false(available);
  assert_false(lock_granted);

  // Ask the frame to release it.
  await postToFrameAndWait(frame, {op: 'release', lock_id});

  await blocked;
  // Now we've got it.
  assert_true(lock_granted);
}, 'Window and Frame - exclusive mode');

promise_test(async t => {
  assert_implements(navigator.locks);
  const res = uniqueName(t);

  const frame1 = await iframe('resources/iframe.html');
  const frame2 = await iframe('resources/iframe.html');

  // frame1 acquires the lock.
  const lock_id = (await postToFrameAndWait(
    frame1, {op: 'request', name: res})).lock_id;

  // frame2's request should be blocked.
  let lock_granted = false;
  const blocked = postToFrameAndWait(
    frame2, {op: 'request', name: res});
  blocked.then(f => { lock_granted = true; });

  // Verify that frame2 can't get it.
  assert_true((await postToFrameAndWait(frame2, {
    op: 'request', name: res, ifAvailable: true
  })).failed, 'Lock request should have failed');
  assert_false(lock_granted);

  // Ask frame1 to release it.
  await postToFrameAndWait(frame1, {op: 'release', lock_id});

  await blocked;
  // Now frame2 can get it.
  assert_true(lock_granted);
  frame1.parentElement.removeChild(frame1);
  frame2.parentElement.removeChild(frame2);
}, 'Frame and Frame - exclusive mode');

promise_test(async t => {
  assert_implements(navigator.locks);
  const res = uniqueName(t);

  const frame = await iframe('resources/iframe.html');

  // Frame acquires the lock.
  await postToFrameAndWait(frame, {op: 'request', name: res});

  // This request should be blocked.
  let lock_granted = false;
  const blocked = navigator.locks.request(
    res, lock => { lock_granted = true; });

  // Verify that we can't get it.
  let available = undefined;
  await navigator.locks.request(
    res, {ifAvailable: true}, lock => { available = lock !== null; });
  assert_false(available);
  assert_false(lock_granted);

  // Implicitly release it by terminating the frame.
  frame.remove();
  await blocked;
  // Now we've got it.
  assert_true(lock_granted);

}, 'Terminated Frame with held lock');

promise_test(async t => {
  assert_implements(navigator.locks);
  const res = uniqueName(t);

  const frame = await iframe('resources/iframe.html');

  // Frame acquires the lock.
  await postToFrameAndWait(frame, {op: 'request', name: res});

  // This request should be blocked.
  let lock_granted = false;
  const blocked = navigator.locks.request(
    res, lock => { lock_granted = true; });

  // Verify that we can't get it.
  let available = undefined;
  await navigator.locks.request(
    res, {ifAvailable: true}, lock => { available = lock !== null; });
  assert_false(available);
  assert_false(lock_granted);

  // Implicitly release it by navigating the frame.
  frame.src = 'about:blank';
  await blocked;
  // Now we've got it.
  assert_true(lock_granted);

}, 'Navigated Frame with held lock');

promise_test(async t => {
  assert_implements(navigator.locks);
  const res = uniqueName(t);

  // frame1 requests and holds res - should be granted immediately.
  // frame2 requests res - should be blocked.
  // frame3 requests res - should be blocked.
  // frame2 is navigated.
  // frame1 releases res.
  // frame3's request should be granted.

  const frame1 = await iframe('resources/iframe.html');
  const frame2 = await iframe('resources/iframe.html');
  const frame3 = await iframe('resources/iframe.html');
  t.add_cleanup(() => { frame1.remove(); });
  t.add_cleanup(() => { frame2.remove(); });
  t.add_cleanup(() => { frame3.remove(); });

  // frame1 requests and holds res - should be granted immediately.
  const lock_id = (await postToFrameAndWait(
    frame1, {op: 'request', name: res})).lock_id;

  // frame2 requests res - should be blocked.
  // (don't attach listeners as they will keep the frame alive)
  frame2.contentWindow.postMessage({op: 'request', name: res}, '*');

  // frame3 requests res - should be blocked.
  let lock_granted = false;
  const blocked = postToFrameAndWait(frame3, {op: 'request', name: res});
  blocked.then(f => { lock_granted = true; });

  // Verify that frame3 can't get it.
  assert_true((await postToFrameAndWait(frame3, {
    op: 'request', name: res, ifAvailable: true
  })).failed, 'Lock request should have failed');
  assert_false(lock_granted);

  // Navigate frame2.
  frame2.src = 'about:blank';

  // frame1 releases lock
  await postToFrameAndWait(frame1, {op: 'release', lock_id});

  // frame3's request should be granted.
  await blocked;
  assert_true(lock_granted);

}, 'Navigated Frame with pending request');

promise_test(async t => {
  assert_implements(navigator.locks);
  const res = uniqueName(t);

  // frame1 requests and holds res - should be granted immediately.
  // frame2 requests res - should be blocked.
  // frame3 requests res - should be blocked.
  // frame2 is removed.
  // frame1 drops lock.
  // frame3's request should be granted.

  const frame1 = await iframe('resources/iframe.html');
  const frame2 = await iframe('resources/iframe.html');
  const frame3 = await iframe('resources/iframe.html');
  t.add_cleanup(() => { frame1.remove(); });
  t.add_cleanup(() => { frame3.remove(); });

  // frame1 requests and holds res - should be granted immediately.
  const lock_id = (await postToFrameAndWait(
    frame1, {op: 'request', name: res})).lock_id;

  // frame2 requests res - should be blocked.
  // (don't attach listeners as they will keep the frame alive)
  frame2.contentWindow.postMessage({op: 'request', name: res}, '*');

  // frame3 requests res - should be blocked.
  let lock_granted = false;
  const blocked = postToFrameAndWait(frame3, {op: 'request', name: res});
  blocked.then(f => { lock_granted = true; });

  // So frame3 can't get it
  assert_true((await postToFrameAndWait(frame3, {
    op: 'request', name: res, ifAvailable: true
  })).failed, 'Lock request should have failed');
  assert_false(lock_granted);

  // Remove frame2.
  frame2.remove();

  // frame1 releases lock
  await postToFrameAndWait(frame1, {op: 'release', lock_id});

  // frame3's request should be granted.
  await blocked;
  assert_true(lock_granted);

}, 'Removed Frame with pending request');

promise_test(async t => {
  assert_implements(navigator.locks);
  const res = uniqueName(t);

  const frame = await iframe('about:blank');

  // Remove a frame while it is in the process of requesting a lock.
  // The promise returned by `request` will never resolve since its frame no
  // longer exists, but the lock should still be released.
  await new Promise(resolve => {
    frame.contentWindow.navigator.locks.request(res, () => {
      frame.remove();
      resolve();
    });
  });

  assert_false((await navigator.locks.query()).held.includes(res));
}, 'Removed Frame as lock is granted');

</script>