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/* 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/. */
export var WindowsInstallsInfo = {
/**
* Retrieve install paths of this app, based on the values in the TaskBarIDs registry key.
*
* Installs from unarchived packages do not have a TaskBarID registry key and
* therefore won't appear in the result.
*
* @param {Number} [limit] Optional, maximum number of installation paths to count.
Defaults to 1024.
* @param {Set} [exclude] Optional, an Set of paths to exclude from the count.
* @returns {Set} Set of install paths, lower cased.
*/
getInstallPaths(limit = 1024, exclude = new Set()) {
// This is somewhat more complicated than just collecting all values because
// the same install can be listed in both HKCU and HKLM. The strategy is to
// add all paths to a Set to deduplicate.
const lcExclude = new Set();
exclude.forEach(p => lcExclude.add(p.toLowerCase()));
// Add the names of the values under `rootKey\subKey` to `set`.
// All strings are lower cased first, as Windows paths are not case-sensitive.
function collectValues(rootKey, wowFlag, subKey, set) {
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; ++i) {
const path = key.getValueName(i).toLowerCase();
if (!lcExclude.has(path)) {
set.add(path);
}
if (set.size >= limit) {
break;
}
}
} finally {
key.close();
}
}
const subKeyName = `Software\\Mozilla\\${Services.appinfo.name}\\TaskBarIDs`;
const paths = new Set();
// 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
);
if (paths.size >= limit) {
break;
}
}
if (paths.size < limit) {
// 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
);
}
return paths;
},
};
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