1 files changed, 70 insertions, 0 deletions
diff --git a/browser/components/resistfingerprinting/test/mochitest/test_bug1382499_touch_api.html b/browser/components/resistfingerprinting/test/mochitest/test_bug1382499_touch_api.html
new file mode 100644
index 0000000000..c440d37cf2
--- /dev/null
+++ b/browser/components/resistfingerprinting/test/mochitest/test_bug1382499_touch_api.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+<script>
+/* global SimpleTest SpecialPowers synthesizeTouch */
+
+SimpleTest.waitForExplicitFinish();
+
+function promiseEvent(target, eventName) {
+  return new Promise(resolve => {
+    target.addEventListener(eventName, resolve, {once: true});
+  });
+}
+
+function promiseTouchEvent(target, type, offsetX, offsetY, params) {
+  let touchEventPromise = promiseEvent(target, type);
+  params.type = type;
+  synthesizeTouch(target, offsetX, offsetY, params);
+  return touchEventPromise;
+}
+
+document.addEventListener("DOMContentLoaded", async () => {
+  const target0 = document.getElementById("target0");
+  const touchParams = {force: 1.0, angle: 1.0, rx: 2, ry: 3};
+  await SpecialPowers.pushPrefEnv({set: [["dom.w3c_touch_events.enabled", 1]]});
+
+  for (let seq of [0, 1, 2, 3]) {
+    let resist = false;
+    if (seq == 0) {
+      resist = true;
+      await SpecialPowers.pushPrefEnv({set: [["privacy.resistFingerprinting", true]]});
+    } else if (seq == 1) {
+      await SpecialPowers.pushPrefEnv({set: [["privacy.resistFingerprinting", false]]});
+    } else if (seq == 2) {
+      resist = true;
+      await SpecialPowers.pushPrefEnv({set: [
+        ["privacy.fingerprintingProtection", true],
+        ["privacy.fingerprintingProtection.overrides", "+TouchEvents"]
+      ]});
+    } else {
+      await SpecialPowers.pushPrefEnv({set: [
+        ["privacy.fingerprintingProtection", true],
+        ["privacy.fingerprintingProtection.overrides", "-TouchEvents"]
+      ]});
+    }
+
+    info("starting test with fingerprinting resistance " + (resist ? "on" : "off") + " sequence number " + seq);
+    let touchEvent = await promiseTouchEvent(target0, "touchstart", 5, 5, touchParams);
+    info("touch event received");
+    let touch = touchEvent.touches[0];
+
+    if (resist) {
+      is(touch.screenX, touch.clientX, "touch.screenX should be the same as touch.clientX");
+      is(touch.screenY, touch.clientY, "touch.screenY should be the same as touch.clientY");
+      // radiusX/radiusY may differ from the original rx/ry because of AppUnitsPerCSSPixel and AppUnitsPerDevPixel.
+      // So only check if the values are spoofed.
+      is(touch.radiusX, 0, "touch.radiusX");
+      is(touch.radiusY, 0, "touch.radiusY");
+    }
+    is(touch.force, resist ? 0.0 : touchParams.force, "touch.force");
+    is(touch.rotationAngle, resist ? 0 : touchParams.angle, "touch.rotationAngle");
+    await SpecialPowers.popPrefEnv();
+  }
+
+  SimpleTest.finish();
+});
+</script>
+<div id="target0">target 0</div>