tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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bug418986-1.js (2575B)

      1 /* globals chromeWindow */
      2 
      3 /* eslint-disable mozilla/no-comparison-or-assignment-inside-ok */
      4 
      5 // The main test function.
      6 var test = function (isContent) {
      7  SimpleTest.waitForExplicitFinish();
      8 
      9  SpecialPowers.pushPrefEnv({
     10    set: [["security.allow_eval_with_system_principal", true]],
     11  });
     12 
     13  if (!isContent) {
     14    let { ww } = SpecialPowers.Services;
     15    window.chromeWindow = ww.activeWindow;
     16  }
     17 
     18  // The pairs of values expected to be the same when
     19  // fingerprinting resistance is enabled.
     20  let pairs = [
     21    ["screenX", 0],
     22    ["screenY", 0],
     23    ["mozInnerScreenX", 0],
     24    ["mozInnerScreenY", 0],
     25    ["screen.pixelDepth", 24],
     26    ["screen.colorDepth", 24],
     27    ["screen.availWidth", "outerWidth"],
     28    ["screen.availHeight", "outerHeight"],
     29    ["screen.left", 0],
     30    ["screen.top", 0],
     31    ["screen.availLeft", 0],
     32    ["screen.availTop", 0],
     33    ["screen.width", "outerWidth"],
     34    ["screen.height", "outerHeight"],
     35    ["devicePixelRatio", 2],
     36  ];
     37 
     38  // checkPair: tests if members of pair [a, b] are equal when evaluated.
     39  let checkPair = function (a, b) {
     40    // eslint-disable-next-line no-eval
     41    is(eval(a), eval(b), a + " should be equal to " + b);
     42  };
     43 
     44  // Returns generator object that iterates through pref values.
     45  let prefVals = (function* () {
     46    yield false;
     47    yield true;
     48  })();
     49 
     50  // The main test function, runs until all pref values are exhausted.
     51  let nextTest = function () {
     52    let { value: prefValue, done } = prefVals.next();
     53    if (done) {
     54      SimpleTest.finish();
     55      return;
     56    }
     57    SpecialPowers.pushPrefEnv(
     58      { set: [["privacy.resistFingerprinting", prefValue]] },
     59      function () {
     60        // We will be resisting fingerprinting if the pref is enabled,
     61        // and we are in a content script (not chrome).
     62        let resisting = prefValue && isContent;
     63        // Check each of the pairs.
     64        pairs.map(function ([item, onVal]) {
     65          if (resisting) {
     66            checkPair("window." + item, onVal);
     67          } else if (!isContent && !item.startsWith("moz")) {
     68            checkPair("window." + item, "chromeWindow." + item);
     69          }
     70        });
     71        if (!isContent && !resisting) {
     72          // Hard to predict these values, but we can enforce constraints:
     73          ok(
     74            window.mozInnerScreenX >= chromeWindow.mozInnerScreenX,
     75            "mozInnerScreenX"
     76          );
     77          ok(
     78            window.mozInnerScreenY >= chromeWindow.mozInnerScreenY,
     79            "mozInnerScreenY"
     80          );
     81        }
     82        nextTest();
     83      }
     84    );
     85  };
     86 
     87  nextTest();
     88 };