1 files changed, 98 insertions, 0 deletions
diff --git a/toolkit/modules/OsEnvironment.sys.mjs b/toolkit/modules/OsEnvironment.sys.mjs
new file mode 100644
index 0000000000..6af5d9db0c
--- /dev/null
+++ b/toolkit/modules/OsEnvironment.sys.mjs
@@ -0,0 +1,98 @@
+/* -*- js-indent-level: 2; indent-tabs-mode: nil -*- */
+/* 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/. */
+
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  WindowsRegistry: "resource://gre/modules/WindowsRegistry.sys.mjs",
+});
+
+XPCOMUtils.defineLazyModuleGetters(lazy, {
+  WindowsVersionInfo:
+    "resource://gre/modules/components-utils/WindowsVersionInfo.jsm",
+});
+
+export let OsEnvironment = {
+  /**
+   * This is a policy object used to override behavior for testing.
+   */
+  Policy: {
+    getAllowedAppSources: () =>
+      lazy.WindowsRegistry.readRegKey(
+        Ci.nsIWindowsRegKey.ROOT_KEY_LOCAL_MACHINE,
+        "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer",
+        "AicEnabled"
+      ),
+    windowsVersionHasAppSourcesFeature: () => {
+      let windowsVersion = parseFloat(Services.sysinfo.getProperty("version"));
+      if (isNaN(windowsVersion)) {
+        throw new Error("Unable to parse Windows version");
+      }
+      if (windowsVersion < 10) {
+        return false;
+      }
+
+      // The App Sources feature was added in Windows 10, build 15063.
+      const { buildNumber } = lazy.WindowsVersionInfo.get();
+      return buildNumber >= 15063;
+    },
+  },
+
+  reportAllowedAppSources() {
+    if (AppConstants.platform != "win") {
+      // This is currently a windows-only feature.
+      return;
+    }
+
+    const appSourceScalar = "os.environment.allowed_app_sources";
+
+    let haveAppSourcesFeature;
+    try {
+      haveAppSourcesFeature = OsEnvironment.Policy.windowsVersionHasAppSourcesFeature();
+    } catch (ex) {
+      Cu.reportError(ex);
+      Services.telemetry.scalarSet(appSourceScalar, "Error");
+      return;
+    }
+    if (!haveAppSourcesFeature) {
+      Services.telemetry.scalarSet(appSourceScalar, "NoSuchFeature");
+      return;
+    }
+
+    let allowedAppSources;
+    try {
+      allowedAppSources = OsEnvironment.Policy.getAllowedAppSources();
+    } catch (ex) {
+      Cu.reportError(ex);
+      Services.telemetry.scalarSet(appSourceScalar, "Error");
+      return;
+    }
+    if (allowedAppSources === undefined) {
+      // A return value of undefined means that the registry value didn't
+      // exist. Windows treats a missing registry entry the same as if the
+      // value is "Anywhere". Make sure to differentiate a missing registry
+      // entry from one containing an empty string, since it is unclear how
+      // Windows would treat such a setting, but it may not be the same as
+      // if the value is missing.
+      allowedAppSources = "Anywhere";
+    }
+
+    const expectedValues = [
+      "Anywhere",
+      "Recommendations",
+      "PreferStore",
+      "StoreOnly",
+    ];
+    if (!expectedValues.includes(allowedAppSources)) {
+      allowedAppSources = "Error";
+    }
+
+    Services.telemetry.scalarSet(appSourceScalar, allowedAppSources);
+  },
+};