1 files changed, 85 insertions, 0 deletions
diff --git a/toolkit/components/resistfingerprinting/tests/browser/browser_fpiServiceWorkers_fingerprinting.js b/toolkit/components/resistfingerprinting/tests/browser/browser_fpiServiceWorkers_fingerprinting.js
new file mode 100644
index 0000000000..64279ae442
--- /dev/null
+++ b/toolkit/components/resistfingerprinting/tests/browser/browser_fpiServiceWorkers_fingerprinting.js
@@ -0,0 +1,85 @@
+/* import-globals-from testHelpers.js */
+
+// This test ensures that a service worker for an exempted domain is exempted when it is
+// in the first party context, and not exempted when it is in a third party context.
+
+runTestInFirstAndThirdPartyContexts(
+  "ServiceWorkers - Check that RFP correctly is exempted and not exempted when FPI is enabled",
+  async win => {
+    // Quickly unset and reset these prefs so we can get the real navigator.hardwareConcurrency
+    // It can't be set externally and then captured because this function gets stringified and
+    // then evaled in a new scope.
+    await SpecialPowers.pushPrefEnv({
+      set: [
+        ["privacy.firstParty.isolate", false],
+        ["privacy.resistFingerprinting", false],
+      ],
+    });
+
+    var DEFAULT_HARDWARE_CONCURRENCY = navigator.hardwareConcurrency;
+
+    await SpecialPowers.popPrefEnv();
+
+    // Register service worker for the first-party window.
+    if (!win.sw) {
+      win.sw = await registerServiceWorker(win, "serviceWorker.js");
+    }
+
+    // Check navigator HW concurrency from the first-party service worker.
+    let res = await sendAndWaitWorkerMessage(
+      win.sw,
+      win.navigator.serviceWorker,
+      { type: "GetHWConcurrency" }
+    );
+    console.info(
+      "First Party, got: " +
+        res.value +
+        " Expected: " +
+        DEFAULT_HARDWARE_CONCURRENCY
+    );
+    is(
+      res.value,
+      DEFAULT_HARDWARE_CONCURRENCY,
+      "As a first party, HW Concurrency should not be spoofed"
+    );
+  },
+  async win => {
+    let SPOOFED_HW_CONCURRENCY = 2;
+
+    // Register service worker for the third-party window.
+    if (!win.sw) {
+      win.sw = await registerServiceWorker(win, "serviceWorker.js");
+    }
+
+    // Check navigator HW concurrency from the first-party service worker.
+    let res = await sendAndWaitWorkerMessage(
+      win.sw,
+      win.navigator.serviceWorker,
+      { type: "GetHWConcurrency" }
+    );
+    console.info(
+      "Third Party, got: " + res.value + " Expected: " + SPOOFED_HW_CONCURRENCY
+    );
+    is(
+      res.value,
+      SPOOFED_HW_CONCURRENCY,
+      "As a third party, HW Concurrency should be spoofed"
+    );
+  },
+  async _ => {
+    await new Promise(resolve => {
+      Services.clearData.deleteData(Ci.nsIClearDataService.CLEAR_ALL, value =>
+        resolve()
+      );
+    });
+  },
+  [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.ipc.processCount", 1],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true],
+    ["privacy.firstparty.isolate", true],
+    ["privacy.resistFingerprinting", true],
+    ["privacy.resistFingerprinting.exemptedDomains", "example.com"],
+  ]
+);