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// The main test function.
var test = function (isContent) {
SimpleTest.waitForExplicitFinish();
let { ww } = SpecialPowers.Services;
window.chromeWindow = ww.activeWindow;
// The pairs of values expected to be the same when
// fingerprinting resistance is enabled.
let pairs = [
["screenX", 0],
["screenY", 0],
["mozInnerScreenX", 0],
["mozInnerScreenY", 0],
["screen.pixelDepth", 24],
["screen.colorDepth", 24],
["screen.availWidth", "innerWidth"],
["screen.availHeight", "innerHeight"],
["screen.left", 0],
["screen.top", 0],
["screen.availLeft", 0],
["screen.availTop", 0],
["screen.width", "innerWidth"],
["screen.height", "innerHeight"],
["screen.orientation.type", "'landscape-primary'"],
["screen.orientation.angle", 0],
["screen.mozOrientation", "'landscape-primary'"],
["devicePixelRatio", 1]
];
// checkPair: tests if members of pair [a, b] are equal when evaluated.
let checkPair = function (a, b) {
is(eval(a), eval(b), a + " should be equal to " + b);
};
// Returns generator object that iterates through pref values.
let prefVals = (for (prefVal of [false, true]) prefVal);
// The main test function, runs until all pref values are exhausted.
let nextTest = function () {
let {value : prefValue, done} = prefVals.next();
if (done) {
SimpleTest.finish();
return;
}
SpecialPowers.pushPrefEnv({set : [["privacy.resistFingerprinting", prefValue]]},
function () {
// We will be resisting fingerprinting if the pref is enabled,
// and we are in a content script (not chrome).
let resisting = prefValue && isContent;
// Check each of the pairs.
pairs.map(function ([item, onVal]) {
if (resisting) {
checkPair("window." + item, onVal);
} else {
if (!item.startsWith("moz")) {
checkPair("window." + item, "chromeWindow." + item);
}
}
});
if (!resisting) {
// Hard to predict these values, but we can enforce constraints:
ok(window.mozInnerScreenX >= chromeWindow.mozInnerScreenX,
"mozInnerScreenX");
ok(window.mozInnerScreenY >= chromeWindow.mozInnerScreenY,
"mozInnerScreenY");
}
nextTest();
});
}
nextTest();
}
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