test_allow_opening_data_json.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>Bug 1403814: Allow toplevel data URI navigation data:application/json</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

</head>

<body>

<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

function test_toplevel_data_json() {

  const DATA_JSON = "data:application/json,{'my_json_key':'my_json_value'}";

  let win = window.open(DATA_JSON);

  let wrappedWin = SpecialPowers.wrap(win);

  // Unfortunately we can't detect whether the JSON has loaded or not using some

  // event, hence we are constantly polling location.href till we see that

  // the data: URI appears. Test times out on failure.

  var jsonLoaded = setInterval(function() {

    if (wrappedWin.document.location.href.startsWith("data:application/json")) {

      clearInterval(jsonLoaded);

      ok(true, "navigating to data:application/json allowed");

      wrappedWin.close();

      SimpleTest.finish();

  }, 200);

SpecialPowers.pushPrefEnv({

  set: [["security.data_uri.block_toplevel_data_uri_navigations", true]]

}, test_toplevel_data_json);

</script>

</body>

</html>