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/* -*- 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/. */
"use strict";
ChromeUtils.import("resource://gre/modules/Services.jsm", this);
var EXPORTED_SYMBOLS = ["UninstallPing"];
/**
* The Windows-only "uninstall" ping, which is saved to disk for the uninstaller to find.
* The ping is actually assembled by TelemetryControllerParent.saveUninstallPing().
*/
var UninstallPing = {
/**
* Maximum number of other installs to count (see
* toolkit/components/telemetry/docs/data/uninstall-ping.rst for motivation)
*/
MAX_OTHER_INSTALLS: 11,
/**
* Count other installs of this app, based on the values in the TaskBarIDs registry key.
*
*/
getOtherInstallsCount(rootKey) {
// This is somewhat more complicated than just counting the number of values on the key:
// 1) the same install can be listed in both HKCU and HKLM
// 2) the current path may not be listed
//
// The strategy is to add all paths to a Set (to deduplicate) and use that size.
// Add the names of the values under `rootKey\subKey` to `set`, until the set has `maxCount`.
// All strings are lower cased first, as Windows paths are not case-sensitive.
function collectValues(rootKey, wowFlag, subKey, set, maxCount) {
if (set.size >= maxCount) {
return;
}
const key = Cc["@mozilla.org/windows-registry-key;1"].createInstance(
Ci.nsIWindowsRegKey
);
try {
key.open(rootKey, subKey, key.ACCESS_READ | wowFlag);
} catch (_e) {
// The key may not exist, ignore.
// (nsWindowsRegKey::Open doesn't provide detailed error codes)
return;
}
const valueCount = key.valueCount;
try {
for (let i = 0; i < valueCount && set.size < maxCount; ++i) {
set.add(key.getValueName(i).toLowerCase());
}
} finally {
key.close();
}
}
const subKeyName = `Software\\Mozilla\\${Services.appinfo.name}\\TaskBarIDs`;
const paths = new Set();
// The current install path may not have a value in TaskBarIDs. It is simpler to
// pre-add it and always include it in the total, than to check for it everywhere and
// sometimes include it.
paths.add(Services.dirsvc.get("GreBinD", Ci.nsIFile).path.toLowerCase());
const initialPathsCount = paths.size;
const maxPathsCount = initialPathsCount + this.MAX_OTHER_INSTALLS;
// First collect from HKLM for both 32-bit and 64-bit installs regardless of the architecture
// of the current application.
for (const wowFlag of [
Ci.nsIWindowsRegKey.WOW64_32,
Ci.nsIWindowsRegKey.WOW64_64,
]) {
collectValues(
Ci.nsIWindowsRegKey.ROOT_KEY_LOCAL_MACHINE,
wowFlag,
subKeyName,
paths,
maxPathsCount
);
}
// Then collect from HKCU.
// HKCU\Software is shared between 32 and 64 so nothing special is needed for WOW64,
// ref https://docs.microsoft.com/en-us/windows/win32/winprog64/shared-registry-keys
collectValues(
Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
0 /* wowFlag */,
subKeyName,
paths,
maxPathsCount
);
// Subtract our pre-added path, which is not an "other" install.
return paths.size - initialPathsCount;
},
};
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