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/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const TEST_PATH = getRootDirectory(gTestPath).replace(
"chrome://mochitests/content",
"https://example.com"
);
const TEST_PAGE_NORMAL = TEST_PATH + "empty.html";
const TEST_PAGE_FINGERPRINTER = TEST_PATH + "canvas-fingerprinter.html";
const TELEMETRY_CANVAS_FINGERPRINTING_PER_TAB = "CANVAS_FINGERPRINTING_PER_TAB";
const KEY_UNKNOWN = "unknown";
const KEY_KNOWN_TEXT = "known_text";
async function clearTelemetry() {
Services.telemetry.getSnapshotForHistograms("main", true /* clear */);
Services.telemetry
.getKeyedHistogramById(TELEMETRY_CANVAS_FINGERPRINTING_PER_TAB)
.clear();
}
async function getKeyedHistogram(histogram_id, key, bucket, checkCntFn) {
let histogram;
// Wait until the telemetry probe appears.
await TestUtils.waitForCondition(() => {
let histograms = Services.telemetry.getSnapshotForKeyedHistograms(
"main",
false /* clear */
).parent;
histogram = histograms[histogram_id];
let checkRes = false;
if (histogram && histogram[key]) {
checkRes = checkCntFn ? checkCntFn(histogram[key].values[bucket]) : true;
}
return checkRes;
});
return histogram[key].values[bucket] || 0;
}
async function checkKeyedHistogram(histogram_id, key, bucket, expectedCnt) {
let cnt = await getKeyedHistogram(histogram_id, key, bucket, cnt => {
if (cnt === undefined) {
cnt = 0;
}
return cnt == expectedCnt;
});
is(cnt, expectedCnt, "There should be expected count in keyed telemetry.");
}
add_setup(async function () {
await clearTelemetry();
});
add_task(async function test_canvas_fingerprinting_telemetry() {
let promiseWindowDestroyed = BrowserUtils.promiseObserved(
"window-global-destroyed"
);
// First, we open a page without any canvas fingerprinters
await BrowserTestUtils.withNewTab(TEST_PAGE_NORMAL, async _ => {});
// Make sure the tab was closed properly before checking Telemetry.
await promiseWindowDestroyed;
// Check that the telemetry has been record properly for normal page. The
// telemetry should show there was no known fingerprinting attempt.
await checkKeyedHistogram(
TELEMETRY_CANVAS_FINGERPRINTING_PER_TAB,
KEY_UNKNOWN,
0,
1
);
await clearTelemetry();
});
add_task(async function test_canvas_fingerprinting_telemetry() {
let promiseWindowDestroyed = BrowserUtils.promiseObserved(
"window-global-destroyed"
);
// Now open a page with a canvas fingerprinter
await BrowserTestUtils.withNewTab(TEST_PAGE_FINGERPRINTER, async _ => {});
// Make sure the tab was closed properly before checking Telemetry.
await promiseWindowDestroyed;
// The telemetry should show a a known fingerprinting text and a known
// canvas fingerprinter.
await checkKeyedHistogram(
TELEMETRY_CANVAS_FINGERPRINTING_PER_TAB,
KEY_KNOWN_TEXT,
6, // CanvasFingerprinter::eVariant4
1
);
await clearTelemetry();
});
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