gecko-dev/dom/media/test/test_eme_requestMediaKeySys...

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<head>
  <title>Test Encrypted Media Extensions access can be gated by application</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
  <script type="text/javascript" src="manifest.js"></script>
  <script type="text/javascript" src="eme.js"></script>
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<pre id="test">
<script class="testbody" type="text/javascript">

// These test cases should be used to make a request to
// requestMediaKeySystemAccess and have the following members:
// name: a name describing the test.
// askAppApproval: used to set prefs such so that Gecko will ask for app
// approval for EME if true, or not if false.
// appApproves: used to set prefs to simulate app approval of permission
// request, true if the app approves the request, false if not.
// expectedKeySystemAccess: true if we expect to be granted key system access,
// false if not.
const testCases = [
  {
    name: "Don't check for app approval",
    askAppApproval: false,
    expectedKeySystemAccess: true,
  },
  {
    name: "Check for app approval and app denies request",
    askAppApproval: true,
    appApproves: false,
    expectedKeySystemAccess: false,
  },
  {
    name: "Check for app approval and app allows request",
    askAppApproval: true,
    appApproves: true,
    expectedKeySystemAccess: true,
  },
];

// Options for requestMediaKeySystemAccess that are expected to work.
const options = [{
  initDataTypes: ['webm'],
  audioCapabilities: [
    { contentType: 'audio/webm; codecs="opus"' },
  ],
  videoCapabilities: [
    { contentType: 'video/webm; codecs="vp8"' }
  ]
}];

async function setTestPrefs({askAppApproval, appApproves}) {
  if (!askAppApproval) {
    // Test doesn't want app approval, set pref so we don't ask and unset prefs
    // used to determine permission response as we don't need them.
    await SpecialPowers.pushPrefEnv({
      set: [["media.eme.require-app-approval", false]],
      clear: [
        ["media.eme.require-app-approval.prompt.testing"],
        ["media.eme.require-app-approval.prompt.testing.allow"],
      ]
    });
    return;
  }

  // Test wants app approval, and will approve deny requests per appApproces
  // value, set prefs accordingly.
  await SpecialPowers.pushPrefEnv({
    set: [
      ["media.eme.require-app-approval", true],
      ["media.eme.require-app-approval.prompt.testing", true],
      ["media.eme.require-app-approval.prompt.testing.allow", appApproves],
    ],
  });
}

// Run a test case that makes a single requestMediaKeySystemAccess call. The
// outcome of such a test run should depend on the test case's setting of
// preferences controlling the eme app approval.
async function testSingleRequest(testCase) {
  await setTestPrefs(testCase);

  try {
    await navigator.requestMediaKeySystemAccess(CLEARKEY_KEYSYSTEM, options);
    ok(testCase.expectedKeySystemAccess,
       `testSingleRequest ${testCase.name}: allowed media key system access.`);
  } catch(e) {
    is(e.name,
       "NotSupportedError",
       "Should get NotSupportedError when request is blocked.");
    is(e.message,
       "The application embedding this user agent has blocked MediaKeySystemAccess",
       "Should get blocked error message.");
    ok(!testCase.expectedKeySystemAccess,
       `testSingleRequest ${testCase.name}: denied media key system access.`);
  }
}

// Run a test case that, but using invalid arguments for
// requestMediaKeySystemAccess. Because we expect the args to be checked
// before requesting app approval, this test ensures that we always fail when
// using bad args, regardless of the app approval prefs set.
async function testRequestWithInvalidArgs(testCase) {
  const badOptions = [{
    initDataTypes: ['badType'],
    audioCapabilities: [
      { contentType: 'audio/webm; codecs="notACodec"' },
    ],
    videoCapabilities: [
      { contentType: 'video/webm; codecs="notACodec"' }
    ]
  }];

  await setTestPrefs(testCase);

  // Check that calls with a bad key system fail.
  try {
    await navigator.requestMediaKeySystemAccess("BadKeySystem", options);
    ok(false,
       `testRequestWithInvalidArgs ${testCase.name}: should not get access when using bad key system.`);
  } catch(e) {
    is(e.name,
       "NotSupportedError",
       "Should get NotSupportedError using bad key system.");
    is(e.message,
       "Key system is unsupported",
       "Should get not supported key system error message.");
  }

  // Check that calls with the bad options fail.
  try {
    await navigator.requestMediaKeySystemAccess(CLEARKEY_KEYSYSTEM, badOptions);
    ok(false,
       `testRequestWithInvalidArgs ${testCase.name}: should not get access when using bad options.`);
  } catch(e) {
    is(e.name,
       "NotSupportedError",
       "Should get NotSupportedError using bad options.");
    is(e.message,
       "Key system configuration is not supported",
       "Should get not supported config error message.");
  }
}

// Run a test case and make multiple requests with the same case. Check that
// all requests are resolved with the expected outcome.
async function testMultipleRequests(testCase) {
  // Number of requests to concurrently make.
  const NUM_REQUESTS = 5;

  await setTestPrefs(testCase);

  let resolveHandler = () => {
    ok(testCase.expectedKeySystemAccess,
       `testMultipleRequests ${testCase.name}: allowed media key system access.`);
  }

  let rejectHandler = e => {
    is(e.name,
       "NotSupportedError",
       "Should get NotSupportedError when request is blocked.");
    is(e.message,
       "The application embedding this user agent has blocked MediaKeySystemAccess",
       "Should get blocked error message.");
    ok(!testCase.expectedKeySystemAccess,
       `testMultipleRequests ${testCase.name}: denied media key system access.`);
  }

  let accessPromises = [];
  for(let i = 0; i < NUM_REQUESTS; i++) {
    // Request access then chain to our resolve and reject handlers. The
    // handlers assert test state then resolve the promise chain. Ensuring the
    // chain is always resolved allows us to correctly await all outstanding
    // requests -- otherwise rejects short circuit the Promise.all call below.
    let accessPromise = navigator.requestMediaKeySystemAccess(CLEARKEY_KEYSYSTEM, options)
      .then(resolveHandler, rejectHandler);
    accessPromises.push(accessPromise);
  }
  // Wait for all promises to be resolved. If not, we'll time out. Because
  // our reject handler chains back into a resolved promise, this should wait
  // for all requests to be serviced, even when requestMediaKeySystemAccess's
  // promise is rejected.
  await Promise.all(accessPromises);
}

async function beginTest() {
  // The tests rely on prefs being set, so run them in sequence. If we run in
  // parallel the tests break each other by overriding prefs.
  for (const testCase of testCases) {
    await testSingleRequest(testCase);
  }
  for (const testCase of testCases) {
    await testRequestWithInvalidArgs(testCase);
  }
  for (const testCase of testCases) {
    await testMultipleRequests(testCase);
  }
  SimpleTest.finish();
}

if (!IsMacOSSnowLeopardOrEarlier()) {
  SimpleTest.waitForExplicitFinish();
  SetupEMEPref(beginTest);
} else {
  todo(false, "Test disabled on this platform.");
}
</script>
</pre>
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