/* 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/. */
// Prefs which start with this prefix are our "control" prefs - they indicate
// which preferences should be synced.
const PREF_SYNC_PREFS_PREFIX = "services.sync.prefs.sync.";
// Prefs which have a default value are usually not synced - however, if the
// preference exists under this prefix and the value is:
// * `true`, then we do sync default values.
// * `false`, then as soon as we ever sync a non-default value out, or sync
// any value in, then we toggle the value to `true`.
//
// We never explicitly set this pref back to false, so it's one-shot.
// Some preferences which are known to have a different default value on
// different platforms have this preference with a default value of `false`,
// so they don't sync until one device changes to the non-default value, then
// that value forever syncs, even if it gets reset back to the default.
// Note that preferences handled this way *must also* have the "normal"
// control pref set.
// A possible future enhancement would be to sync these prefs so that
// other distributions can flag them if they change the default, but that
// doesn't seem worthwhile until we can be confident they'd actually create
// this special control pref at the same time they flip the default.
const PREF_SYNC_SEEN_PREFIX = "services.sync.prefs.sync-seen.";
import {
Store,
SyncEngine,
Tracker,
} from "resource://services-sync/engines.sys.mjs";
import { CryptoWrapper } from "resource://services-sync/record.sys.mjs";
import { Svc, Utils } from "resource://services-sync/util.sys.mjs";
import { SCORE_INCREMENT_XLARGE } from "resource://services-sync/constants.sys.mjs";
import { CommonUtils } from "resource://services-common/utils.sys.mjs";
const lazy = {};
ChromeUtils.defineLazyGetter(lazy, "PREFS_GUID", () =>
CommonUtils.encodeBase64URL(Services.appinfo.ID)
);
ChromeUtils.defineESModuleGetters(lazy, {
AddonManager: "resource://gre/modules/AddonManager.sys.mjs",
});
// In bug 1538015, we decided that it isn't always safe to allow all "incoming"
// preferences to be applied locally. So we introduced another preference to control
// this for backward compatibility. We removed that capability in bug 1854698, but in the
// interests of working well between different versions of Firefox, we still forever
// want to prevent this preference from syncing.
// This was the name of the "control" pref.
const PREF_SYNC_PREFS_ARBITRARY =
"services.sync.prefs.dangerously_allow_arbitrary";
// Check for a local control pref or PREF_SYNC_PREFS_ARBITRARY
function isAllowedPrefName(prefName) {
if (prefName == PREF_SYNC_PREFS_ARBITRARY) {
return false; // never allow this.
}
// The pref must already have a control pref set, although it doesn't matter
// here whether that value is true or false. We can't use prefHasUserValue
// here because we also want to check prefs still with default values.
try {
Services.prefs.getBoolPref(PREF_SYNC_PREFS_PREFIX + prefName);
// pref exists!
return true;
} catch (_) {
return false;
}
}
export function PrefRec(collection, id) {
CryptoWrapper.call(this, collection, id);
}
PrefRec.prototype = {
_logName: "Sync.Record.Pref",
};
Object.setPrototypeOf(PrefRec.prototype, CryptoWrapper.prototype);
Utils.deferGetSet(PrefRec, "cleartext", ["value"]);
export function PrefsEngine(service) {
SyncEngine.call(this, "Prefs", service);
}
PrefsEngine.prototype = {
_storeObj: PrefStore,
_trackerObj: PrefTracker,
_recordObj: PrefRec,
version: 2,
syncPriority: 1,
allowSkippedRecord: false,
async getChangedIDs() {
// No need for a proper timestamp (no conflict resolution needed).
let changedIDs = {};
if (this._tracker.modified) {
changedIDs[lazy.PREFS_GUID] = 0;
}
return changedIDs;
},
async _wipeClient() {
await SyncEngine.prototype._wipeClient.call(this);
this.justWiped = true;
},
async _reconcile(item) {
// Apply the incoming item if we don't care about the local data
if (this.justWiped) {
this.justWiped = false;
return true;
}
return SyncEngine.prototype._reconcile.call(this, item);
},
async _uploadOutgoing() {
try {
await SyncEngine.prototype._uploadOutgoing.call(this);
} finally {
this._store._incomingPrefs = null;
}
},
async trackRemainingChanges() {
if (this._modified.count() > 0) {
this._tracker.modified = true;
}
},
};
Object.setPrototypeOf(PrefsEngine.prototype, SyncEngine.prototype);
// We don't use services.sync.engine.tabs.filteredSchemes since it includes
// about: pages and the like, which we want to be syncable in preferences.
// Blob, moz-extension, data and file uris are never safe to sync,
// so we limit our check to those.
const UNSYNCABLE_URL_REGEXP = /^(moz-extension|blob|data|file):/i;
function isUnsyncableURLPref(prefName) {
if (Services.prefs.getPrefType(prefName) != Ci.nsIPrefBranch.PREF_STRING) {
return false;
}
const prefValue = Services.prefs.getStringPref(prefName, "");
return UNSYNCABLE_URL_REGEXP.test(prefValue);
}
function PrefStore(name, engine) {
Store.call(this, name, engine);
Svc.Obs.add(
"profile-before-change",
function () {
this.__prefs = null;
},
this
);
}
PrefStore.prototype = {
__prefs: null,
// used just for logging so we can work out why we chose to re-upload
_incomingPrefs: null,
get _prefs() {
if (!this.__prefs) {
this.__prefs = Services.prefs.getBranch("");
}
return this.__prefs;
},
_getSyncPrefs() {
let syncPrefs = Services.prefs
.getBranch(PREF_SYNC_PREFS_PREFIX)
.getChildList("")
.filter(pref => isAllowedPrefName(pref) && !isUnsyncableURLPref(pref));
// Also sync preferences that determine which prefs get synced.
let controlPrefs = syncPrefs.map(pref => PREF_SYNC_PREFS_PREFIX + pref);
return controlPrefs.concat(syncPrefs);
},
_isSynced(pref) {
if (pref.startsWith(PREF_SYNC_PREFS_PREFIX)) {
// this is an incoming control pref, which is ignored if there's not already
// a local control pref for the preference.
let controlledPref = pref.slice(PREF_SYNC_PREFS_PREFIX.length);
return isAllowedPrefName(controlledPref);
}
// This is the pref itself - it must be both allowed, and have a control
// pref which is true.
if (!this._prefs.getBoolPref(PREF_SYNC_PREFS_PREFIX + pref, false)) {
return false;
}
return isAllowedPrefName(pref);
},
// Given a preference name, returns either a string, bool, number or null.
_getPrefValue(pref) {
switch (this._prefs.getPrefType(pref)) {
case Ci.nsIPrefBranch.PREF_STRING:
return this._prefs.getStringPref(pref);
case Ci.nsIPrefBranch.PREF_INT:
return this._prefs.getIntPref(pref);
case Ci.nsIPrefBranch.PREF_BOOL:
return this._prefs.getBoolPref(pref);
// case Ci.nsIPrefBranch.PREF_INVALID: handled by the fallthrough
}
return null;
},
_getAllPrefs() {
let values = {};
for (let pref of this._getSyncPrefs()) {
// Note: _isSynced doesn't call isUnsyncableURLPref since it would cause
// us not to apply (syncable) changes to preferences that are set locally
// which have unsyncable urls.
if (this._isSynced(pref) && !isUnsyncableURLPref(pref)) {
let isSet = this._prefs.prefHasUserValue(pref);
// Missing and default prefs get the null value, unless that `seen`
// pref is set, in which case it always gets the value.
let forceValue = this._prefs.getBoolPref(
PREF_SYNC_SEEN_PREFIX + pref,
false
);
if (isSet || forceValue) {
values[pref] = this._getPrefValue(pref);
} else {
values[pref] = null;
}
// If incoming and outgoing don't match then either the user toggled a
// pref that doesn't match an incoming non-default value for that pref
// during a sync (unlikely!) or it refused to stick and is behaving oddly.
if (this._incomingPrefs) {
let inValue = this._incomingPrefs[pref];
let outValue = values[pref];
if (inValue != null && outValue != null && inValue != outValue) {
this._log.debug(`Incoming pref '${pref}' refused to stick?`);
this._log.trace(`Incoming: '${inValue}', outgoing: '${outValue}'`);
}
}
// If this is a special "sync-seen" pref, and it's not the default value,
// set the seen pref to true.
if (
isSet &&
this._prefs.getBoolPref(PREF_SYNC_SEEN_PREFIX + pref, false) === false
) {
this._log.trace(`toggling sync-seen pref for '${pref}' to true`);
this._prefs.setBoolPref(PREF_SYNC_SEEN_PREFIX + pref, true);
}
}
}
return values;
},
_maybeLogPrefChange(pref, incomingValue, existingValue) {
if (incomingValue != existingValue) {
this._log.debug(`Adjusting preference "${pref}" to the incoming value`);
// values are PII, so must only be logged at trace.
this._log.trace(`Existing: ${existingValue}. Incoming: ${incomingValue}`);
}
},
_setAllPrefs(values) {
const selectedThemeIDPref = "extensions.activeThemeID";
let selectedThemeIDBefore = this._prefs.getStringPref(
selectedThemeIDPref,
null
);
let selectedThemeIDAfter = selectedThemeIDBefore;
// Update 'services.sync.prefs.sync.foo.pref' before 'foo.pref', otherwise
// _isSynced returns false when 'foo.pref' doesn't exist (e.g., on a new device).
let prefs = Object.keys(values).sort(
a => -a.indexOf(PREF_SYNC_PREFS_PREFIX)
);
for (let pref of prefs) {
let value = values[pref];
if (!this._isSynced(pref)) {
// It's unusual for us to find an incoming preference (ie, a pref some other
// instance thinks is syncable) which we don't think is syncable.
this._log.trace(`Ignoring incoming unsyncable preference "${pref}"`);
continue;
}
if (typeof value == "string" && UNSYNCABLE_URL_REGEXP.test(value)) {
this._log.trace(`Skipping incoming unsyncable url for pref: ${pref}`);
continue;
}
switch (pref) {
// Some special prefs we don't want to set directly.
case selectedThemeIDPref:
selectedThemeIDAfter = value;
break;
// default is to just set the pref
default:
if (value == null) {
// Pref has gone missing. The best we can do is reset it.
if (this._prefs.prefHasUserValue(pref)) {
this._log.debug(`Clearing existing local preference "${pref}"`);
this._log.trace(
`Existing local value for preference: ${this._getPrefValue(
pref
)}`
);
}
this._prefs.clearUserPref(pref);
} else {
try {
switch (typeof value) {
case "string":
this._maybeLogPrefChange(
pref,
value,
this._prefs.getStringPref(pref, undefined)
);
this._prefs.setStringPref(pref, value);
break;
case "number":
this._maybeLogPrefChange(
pref,
value,
this._prefs.getIntPref(pref, undefined)
);
this._prefs.setIntPref(pref, value);
break;
case "boolean":
this._maybeLogPrefChange(
pref,
value,
this._prefs.getBoolPref(pref, undefined)
);
this._prefs.setBoolPref(pref, value);
break;
}
} catch (ex) {
this._log.trace(`Failed to set pref: ${pref}`, ex);
}
}
// If there's a "sync-seen" pref for this it gets toggled to true
// regardless of the value.
let seenPref = PREF_SYNC_SEEN_PREFIX + pref;
if (
this._prefs.getPrefType(seenPref) != Ci.nsIPrefBranch.PREF_INVALID
) {
this._prefs.setBoolPref(PREF_SYNC_SEEN_PREFIX + pref, true);
}
}
}
// Themes are a little messy. Themes which have been installed are handled
// by the addons engine - but default themes aren't seen by that engine.
// So if there's a new default theme ID and that ID corresponds to a
// system addon, then we arrange to enable that addon here.
if (selectedThemeIDBefore != selectedThemeIDAfter) {
this._maybeEnableBuiltinTheme(selectedThemeIDAfter).catch(e => {
this._log.error("Failed to maybe update the default theme", e);
});
}
},
async _maybeEnableBuiltinTheme(themeId) {
let addon = null;
try {
addon = await lazy.AddonManager.getAddonByID(themeId);
} catch (ex) {
this._log.trace(
`There's no addon with ID '${themeId} - it can't be a builtin theme`
);
return;
}
if (addon && addon.isBuiltin && addon.type == "theme") {
this._log.trace(`Enabling builtin theme '${themeId}'`);
await addon.enable();
} else {
this._log.trace(
`Have incoming theme ID of '${themeId}' but it's not a builtin theme`
);
}
},
async getAllIDs() {
/* We store all prefs in just one WBO, with just one GUID */
let allprefs = {};
allprefs[lazy.PREFS_GUID] = true;
return allprefs;
},
async changeItemID() {
this._log.trace("PrefStore GUID is constant!");
},
async itemExists(id) {
return id === lazy.PREFS_GUID;
},
async createRecord(id, collection) {
let record = new PrefRec(collection, id);
if (id == lazy.PREFS_GUID) {
record.value = this._getAllPrefs();
} else {
record.deleted = true;
}
return record;
},
async create() {
this._log.trace("Ignoring create request");
},
async remove() {
this._log.trace("Ignoring remove request");
},
async update(record) {
// Silently ignore pref updates that are for other apps.
if (record.id != lazy.PREFS_GUID) {
return;
}
this._log.trace("Received pref updates, applying...");
this._incomingPrefs = record.value;
this._setAllPrefs(record.value);
},
async wipe() {
this._log.trace("Ignoring wipe request");
},
};
Object.setPrototypeOf(PrefStore.prototype, Store.prototype);
function PrefTracker(name, engine) {
Tracker.call(this, name, engine);
this._ignoreAll = false;
Svc.Obs.add("profile-before-change", this.asyncObserver);
}
PrefTracker.prototype = {
get ignoreAll() {
return this._ignoreAll;
},
set ignoreAll(value) {
this._ignoreAll = value;
},
get modified() {
return Svc.PrefBranch.getBoolPref("engine.prefs.modified", false);
},
set modified(value) {
Svc.PrefBranch.setBoolPref("engine.prefs.modified", value);
},
clearChangedIDs: function clearChangedIDs() {
this.modified = false;
},
__prefs: null,
get _prefs() {
if (!this.__prefs) {
this.__prefs = Services.prefs.getBranch("");
}
return this.__prefs;
},
onStart() {
Services.prefs.addObserver("", this.asyncObserver);
},
onStop() {
this.__prefs = null;
Services.prefs.removeObserver("", this.asyncObserver);
},
async observe(subject, topic, data) {
switch (topic) {
case "profile-before-change":
await this.stop();
break;
case "nsPref:changed":
if (this.ignoreAll) {
break;
}
// Trigger a sync for MULTI-DEVICE for a change that determines
// which prefs are synced or a regular pref change.
if (
data.indexOf(PREF_SYNC_PREFS_PREFIX) == 0 ||
this._prefs.getBoolPref(PREF_SYNC_PREFS_PREFIX + data, false)
) {
this.score += SCORE_INCREMENT_XLARGE;
this.modified = true;
this._log.trace("Preference " + data + " changed");
}
break;
}
},
};
Object.setPrototypeOf(PrefTracker.prototype, Tracker.prototype);
export function getPrefsGUIDForTest() {
return lazy.PREFS_GUID;
}
