Source code
Revision control
Copy as Markdown
Other Tools
Test Info: Errors
- This test failed 1 times in the preceding 30 days. quicksearch this test
- Manifest: toolkit/components/resistfingerprinting/tests/browser/browser.toml
/* 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
/**
*/
const emptyPage =
getRootDirectory(gTestPath).replace(
) + "empty.html";
function getImageData(tab, isOffscreen, method) {
const extractCanvas = function (isOffscreen, method) {
const canvas = isOffscreen
? new OffscreenCanvas(3, 1)
: document.createElement("canvas");
const ctx = canvas.getContext("2d");
if (!isOffscreen) {
canvas.width = 3;
canvas.height = 1;
}
ctx.fillStyle = "rgb(255, 0, 0)";
ctx.fillRect(0, 0, 1, 1);
ctx.fillStyle = "rgb(0, 255, 0)";
ctx.fillRect(1, 0, 1, 1);
ctx.fillStyle = "rgb(0, 0, 255)";
ctx.fillRect(2, 0, 1, 1);
if (method === "getImageData") {
return ctx.getImageData(0, 0, 3, 1).data.join(",");
} else if (method === "toDataURL") {
return canvas.toDataURL("image/png", 1);
} else if (method === "toBlob") {
return new Promise((resolve, reject) => {
if (isOffscreen) {
canvas.toBlob().then(resolve, reject);
} else {
canvas.toBlob(resolve, "image/png", 1);
}
}).then(blob => {
const reader = new FileReader();
reader.readAsDataURL(blob);
const { promise, resolve, reject } = Promise.withResolvers();
reader.onload = () => resolve(reader.result);
reader.onerror = reject;
return promise;
});
} else if (method === "convertToBlob") {
return canvas.convertToBlob().then(blob => {
const reader = new FileReader();
reader.readAsDataURL(blob);
const { promise, resolve, reject } = Promise.withResolvers();
reader.onload = () => resolve(reader.result);
reader.onerror = reject;
return promise;
});
}
throw new Error("Unknown method");
};
const extractCanvasExpr = `(${extractCanvas.toString()})(${isOffscreen}, "${method}");`;
return SpecialPowers.spawn(
tab.linkedBrowser,
[extractCanvasExpr],
async funccode => content.eval(funccode)
);
}
// Test cases: [isOffscreen, method, true value]
const TEST_CASES = [
// HTMLCanvasElement
[false, "getImageData", null],
[false, "toDataURL", null],
[false, "toBlob", null],
// OffscreenCanvas
[true, "getImageData", null],
[true, "toBlob", null],
[true, "convertToBlob", null],
];
add_setup(async function setup() {
await SpecialPowers.pushPrefEnv({
set: [
["test.wait300msAfterTabSwitch", true],
["privacy.resistFingerprinting", false],
["privacy.fingerprintingProtection", false],
],
});
const tab = await BrowserTestUtils.openNewForegroundTab({
gBrowser,
opening: emptyPage,
forceNewProcess: true,
});
for (let i = 0; i < TEST_CASES.length; i++) {
const test_case = TEST_CASES[i];
const [isOffscreen, method] = test_case;
const readback = await getImageData(tab, isOffscreen, method);
if (readback == null || !readback.length) {
throw new Error(
`Failed to get the initial readback for ${
isOffscreen ? "Offscreen Canvas" : "HTML Canvas"
} ${method} got ${readback}`
);
}
test_case[2] = readback;
}
BrowserTestUtils.removeTab(tab);
await SpecialPowers.popPrefEnv();
});
async function runTest(permissionGranted, isRFP) {
await SpecialPowers.pushPrefEnv({
set: [
["privacy.resistFingerprinting", isRFP],
["privacy.fingerprintingProtection", !isRFP],
[
"privacy.fingerprintingProtection.overrides",
"-AllTargets,+CanvasRandomization,+CanvasImageExtractionPrompt",
],
],
});
const tab = await BrowserTestUtils.openNewForegroundTab({
gBrowser,
opening: emptyPage,
forceNewProcess: true,
});
if (permissionGranted) {
await SpecialPowers.pushPermissions([
{
type: "canvas",
allow: true,
context: emptyPage,
},
]);
}
for (let i = 0; i < TEST_CASES.length; i++) {
const test_case = TEST_CASES[i];
const [isOffscreen, method, trueValue] = test_case;
const readback = await getImageData(tab, isOffscreen, method);
const message = `PermissionGranted: ${permissionGranted}; Method: ${method}; Offscreen: ${isOffscreen}; Image should be ${
permissionGranted ? "the same" : "different"
}`;
permissionGranted
? is(readback, trueValue, message)
: isnot(readback, trueValue, message);
}
if (permissionGranted) {
await SpecialPowers.popPermissions();
}
BrowserTestUtils.removeTab(tab);
await SpecialPowers.popPrefEnv();
}
add_task(async function test_rfp_no_permission() {
await runTest(false, true);
});
add_task(async function test_rfp_permission() {
await runTest(true, true);
});
add_task(async function test_fpp_no_permission() {
await runTest(false, false);
});
add_task(async function test_fpp_permission() {
await runTest(true, false);
});