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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/. */
+
+/*
+ * This file defines the add-on sync functionality.
+ *
+ * There are currently a number of known limitations:
+ * - We only sync XPI extensions and themes available from addons.mozilla.org.
+ * We hope to expand support for other add-ons eventually.
+ * - We only attempt syncing of add-ons between applications of the same type.
+ * This means add-ons will not synchronize between Firefox desktop and
+ * Firefox mobile, for example. This is because of significant add-on
+ * incompatibility between application types.
+ *
+ * Add-on records exist for each known {add-on, app-id} pair in the Sync client
+ * set. Each record has a randomly chosen GUID. The records then contain
+ * basic metadata about the add-on.
+ *
+ * We currently synchronize:
+ *
+ * - Installations
+ * - Uninstallations
+ * - User enabling and disabling
+ *
+ * Synchronization is influenced by the following preferences:
+ *
+ * - services.sync.addons.ignoreUserEnabledChanges
+ * - services.sync.addons.trustedSourceHostnames
+ *
+ * and also influenced by whether addons have repository caching enabled and
+ * whether they allow installation of addons from insecure options (both of
+ * which are themselves influenced by the "extensions." pref branch)
+ *
+ * See the documentation in all.js for the behavior of these prefs.
+ */
+
+import { AddonUtils } from "resource://services-sync/addonutils.sys.mjs";
+import { AddonsReconciler } from "resource://services-sync/addonsreconciler.sys.mjs";
+import {
+ Store,
+ SyncEngine,
+ LegacyTracker,
+} 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 { CollectionValidator } from "resource://services-sync/collection_validator.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+ AddonManager: "resource://gre/modules/AddonManager.sys.mjs",
+ AddonRepository: "resource://gre/modules/addons/AddonRepository.sys.mjs",
+});
+
+// 7 days in milliseconds.
+const PRUNE_ADDON_CHANGES_THRESHOLD = 60 * 60 * 24 * 7 * 1000;
+
+/**
+ * AddonRecord represents the state of an add-on in an application.
+ *
+ * Each add-on has its own record for each application ID it is installed
+ * on.
+ *
+ * The ID of add-on records is a randomly-generated GUID. It is random instead
+ * of deterministic so the URIs of the records cannot be guessed and so
+ * compromised server credentials won't result in disclosure of the specific
+ * add-ons present in a Sync account.
+ *
+ * The record contains the following fields:
+ *
+ * addonID
+ * ID of the add-on. This correlates to the "id" property on an Addon type.
+ *
+ * applicationID
+ * The application ID this record is associated with.
+ *
+ * enabled
+ * Boolean stating whether add-on is enabled or disabled by the user.
+ *
+ * source
+ * String indicating where an add-on is from. Currently, we only support
+ * the value "amo" which indicates that the add-on came from the official
+ * add-ons repository, addons.mozilla.org. In the future, we may support
+ * installing add-ons from other sources. This provides a future-compatible
+ * mechanism for clients to only apply records they know how to handle.
+ */
+function AddonRecord(collection, id) {
+ CryptoWrapper.call(this, collection, id);
+}
+AddonRecord.prototype = {
+ _logName: "Record.Addon",
+};
+Object.setPrototypeOf(AddonRecord.prototype, CryptoWrapper.prototype);
+
+Utils.deferGetSet(AddonRecord, "cleartext", [
+ "addonID",
+ "applicationID",
+ "enabled",
+ "source",
+]);
+
+/**
+ * The AddonsEngine handles synchronization of add-ons between clients.
+ *
+ * The engine maintains an instance of an AddonsReconciler, which is the entity
+ * maintaining state for add-ons. It provides the history and tracking APIs
+ * that AddonManager doesn't.
+ *
+ * The engine instance overrides a handful of functions on the base class. The
+ * rationale for each is documented by that function.
+ */
+export function AddonsEngine(service) {
+ SyncEngine.call(this, "Addons", service);
+
+ this._reconciler = new AddonsReconciler(this._tracker.asyncObserver);
+}
+
+AddonsEngine.prototype = {
+ _storeObj: AddonsStore,
+ _trackerObj: AddonsTracker,
+ _recordObj: AddonRecord,
+ version: 1,
+
+ syncPriority: 5,
+
+ _reconciler: null,
+
+ async initialize() {
+ await SyncEngine.prototype.initialize.call(this);
+ await this._reconciler.ensureStateLoaded();
+ },
+
+ /**
+ * Override parent method to find add-ons by their public ID, not Sync GUID.
+ */
+ async _findDupe(item) {
+ let id = item.addonID;
+
+ // The reconciler should have been updated at the top of the sync, so we
+ // can assume it is up to date when this function is called.
+ let addons = this._reconciler.addons;
+ if (!(id in addons)) {
+ return null;
+ }
+
+ let addon = addons[id];
+ if (addon.guid != item.id) {
+ return addon.guid;
+ }
+
+ return null;
+ },
+
+ /**
+ * Override getChangedIDs to pull in tracker changes plus changes from the
+ * reconciler log.
+ */
+ async getChangedIDs() {
+ let changes = {};
+ const changedIDs = await this._tracker.getChangedIDs();
+ for (let [id, modified] of Object.entries(changedIDs)) {
+ changes[id] = modified;
+ }
+
+ let lastSync = await this.getLastSync();
+ let lastSyncDate = new Date(lastSync * 1000);
+
+ // The reconciler should have been refreshed at the beginning of a sync and
+ // we assume this function is only called from within a sync.
+ let reconcilerChanges = this._reconciler.getChangesSinceDate(lastSyncDate);
+ let addons = this._reconciler.addons;
+ for (let change of reconcilerChanges) {
+ let changeTime = change[0];
+ let id = change[2];
+
+ if (!(id in addons)) {
+ continue;
+ }
+
+ // Keep newest modified time.
+ if (id in changes && changeTime < changes[id]) {
+ continue;
+ }
+
+ if (!(await this.isAddonSyncable(addons[id]))) {
+ continue;
+ }
+
+ this._log.debug("Adding changed add-on from changes log: " + id);
+ let addon = addons[id];
+ changes[addon.guid] = changeTime.getTime() / 1000;
+ }
+
+ return changes;
+ },
+
+ /**
+ * Override start of sync function to refresh reconciler.
+ *
+ * Many functions in this class assume the reconciler is refreshed at the
+ * top of a sync. If this ever changes, those functions should be revisited.
+ *
+ * Technically speaking, we don't need to refresh the reconciler on every
+ * sync since it is installed as an AddonManager listener. However, add-ons
+ * are complicated and we force a full refresh, just in case the listeners
+ * missed something.
+ */
+ async _syncStartup() {
+ // We refresh state before calling parent because syncStartup in the parent
+ // looks for changed IDs, which is dependent on add-on state being up to
+ // date.
+ await this._refreshReconcilerState();
+ return SyncEngine.prototype._syncStartup.call(this);
+ },
+
+ /**
+ * Override end of sync to perform a little housekeeping on the reconciler.
+ *
+ * We prune changes to prevent the reconciler state from growing without
+ * bound. Even if it grows unbounded, there would have to be many add-on
+ * changes (thousands) for it to slow things down significantly. This is
+ * highly unlikely to occur. Still, we exercise defense just in case.
+ */
+ async _syncCleanup() {
+ let lastSync = await this.getLastSync();
+ let ms = 1000 * lastSync - PRUNE_ADDON_CHANGES_THRESHOLD;
+ this._reconciler.pruneChangesBeforeDate(new Date(ms));
+ return SyncEngine.prototype._syncCleanup.call(this);
+ },
+
+ /**
+ * Helper function to ensure reconciler is up to date.
+ *
+ * This will load the reconciler's state from the file
+ * system (if needed) and refresh the state of the reconciler.
+ */
+ async _refreshReconcilerState() {
+ this._log.debug("Refreshing reconciler state");
+ return this._reconciler.refreshGlobalState();
+ },
+
+ // Returns a promise
+ isAddonSyncable(addon, ignoreRepoCheck) {
+ return this._store.isAddonSyncable(addon, ignoreRepoCheck);
+ },
+};
+Object.setPrototypeOf(AddonsEngine.prototype, SyncEngine.prototype);
+
+/**
+ * This is the primary interface between Sync and the Addons Manager.
+ *
+ * In addition to the core store APIs, we provide convenience functions to wrap
+ * Add-on Manager APIs with Sync-specific semantics.
+ */
+function AddonsStore(name, engine) {
+ Store.call(this, name, engine);
+}
+AddonsStore.prototype = {
+ // Define the add-on types (.type) that we support.
+ _syncableTypes: ["extension", "theme"],
+
+ _extensionsPrefs: Services.prefs.getBranch("extensions."),
+
+ get reconciler() {
+ return this.engine._reconciler;
+ },
+
+ /**
+ * Override applyIncoming to filter out records we can't handle.
+ */
+ async applyIncoming(record) {
+ // The fields we look at aren't present when the record is deleted.
+ if (!record.deleted) {
+ // Ignore records not belonging to our application ID because that is the
+ // current policy.
+ if (record.applicationID != Services.appinfo.ID) {
+ this._log.info(
+ "Ignoring incoming record from other App ID: " + record.id
+ );
+ return;
+ }
+
+ // Ignore records that aren't from the official add-on repository, as that
+ // is our current policy.
+ if (record.source != "amo") {
+ this._log.info(
+ "Ignoring unknown add-on source (" +
+ record.source +
+ ")" +
+ " for " +
+ record.id
+ );
+ return;
+ }
+ }
+
+ // Ignore incoming records for which an existing non-syncable addon
+ // exists. Note that we do not insist that the addon manager already have
+ // metadata for this addon - it's possible our reconciler previously saw the
+ // addon but the addon-manager cache no longer has it - which is fine for a
+ // new incoming addon.
+ // (Note that most other cases where the addon-manager cache is invalid
+ // doesn't get this treatment because that cache self-repairs after some
+ // time - but it only re-populates addons which are currently installed.)
+ let existingMeta = this.reconciler.addons[record.addonID];
+ if (
+ existingMeta &&
+ !(await this.isAddonSyncable(existingMeta, /* ignoreRepoCheck */ true))
+ ) {
+ this._log.info(
+ "Ignoring incoming record for an existing but non-syncable addon",
+ record.addonID
+ );
+ return;
+ }
+
+ await Store.prototype.applyIncoming.call(this, record);
+ },
+
+ /**
+ * Provides core Store API to create/install an add-on from a record.
+ */
+ async create(record) {
+ // This will throw if there was an error. This will get caught by the sync
+ // engine and the record will try to be applied later.
+ const results = await AddonUtils.installAddons([
+ {
+ id: record.addonID,
+ syncGUID: record.id,
+ enabled: record.enabled,
+ requireSecureURI: this._extensionsPrefs.getBoolPref(
+ "install.requireSecureOrigin",
+ true
+ ),
+ },
+ ]);
+
+ if (results.skipped.includes(record.addonID)) {
+ this._log.info("Add-on skipped: " + record.addonID);
+ // Just early-return for skipped addons - we don't want to arrange to
+ // try again next time because the condition that caused up to skip
+ // will remain true for this addon forever.
+ return;
+ }
+
+ let addon;
+ for (let a of results.addons) {
+ if (a.id == record.addonID) {
+ addon = a;
+ break;
+ }
+ }
+
+ // This should never happen, but is present as a fail-safe.
+ if (!addon) {
+ throw new Error("Add-on not found after install: " + record.addonID);
+ }
+
+ this._log.info("Add-on installed: " + record.addonID);
+ },
+
+ /**
+ * Provides core Store API to remove/uninstall an add-on from a record.
+ */
+ async remove(record) {
+ // If this is called, the payload is empty, so we have to find by GUID.
+ let addon = await this.getAddonByGUID(record.id);
+ if (!addon) {
+ // We don't throw because if the add-on could not be found then we assume
+ // it has already been uninstalled and there is nothing for this function
+ // to do.
+ return;
+ }
+
+ this._log.info("Uninstalling add-on: " + addon.id);
+ await AddonUtils.uninstallAddon(addon);
+ },
+
+ /**
+ * Provides core Store API to update an add-on from a record.
+ */
+ async update(record) {
+ let addon = await this.getAddonByID(record.addonID);
+
+ // update() is called if !this.itemExists. And, since itemExists consults
+ // the reconciler only, we need to take care of some corner cases.
+ //
+ // First, the reconciler could know about an add-on that was uninstalled
+ // and no longer present in the add-ons manager.
+ if (!addon) {
+ await this.create(record);
+ return;
+ }
+
+ // It's also possible that the add-on is non-restartless and has pending
+ // install/uninstall activity.
+ //
+ // We wouldn't get here if the incoming record was for a deletion. So,
+ // check for pending uninstall and cancel if necessary.
+ if (addon.pendingOperations & lazy.AddonManager.PENDING_UNINSTALL) {
+ addon.cancelUninstall();
+
+ // We continue with processing because there could be state or ID change.
+ }
+
+ await this.updateUserDisabled(addon, !record.enabled);
+ },
+
+ /**
+ * Provide core Store API to determine if a record exists.
+ */
+ async itemExists(guid) {
+ let addon = this.reconciler.getAddonStateFromSyncGUID(guid);
+
+ return !!addon;
+ },
+
+ /**
+ * Create an add-on record from its GUID.
+ *
+ * @param guid
+ * Add-on GUID (from extensions DB)
+ * @param collection
+ * Collection to add record to.
+ *
+ * @return AddonRecord instance
+ */
+ async createRecord(guid, collection) {
+ let record = new AddonRecord(collection, guid);
+ record.applicationID = Services.appinfo.ID;
+
+ let addon = this.reconciler.getAddonStateFromSyncGUID(guid);
+
+ // If we don't know about this GUID or if it has been uninstalled, we mark
+ // the record as deleted.
+ if (!addon || !addon.installed) {
+ record.deleted = true;
+ return record;
+ }
+
+ record.modified = addon.modified.getTime() / 1000;
+
+ record.addonID = addon.id;
+ record.enabled = addon.enabled;
+
+ // This needs to be dynamic when add-ons don't come from AddonRepository.
+ record.source = "amo";
+
+ return record;
+ },
+
+ /**
+ * Changes the id of an add-on.
+ *
+ * This implements a core API of the store.
+ */
+ async changeItemID(oldID, newID) {
+ // We always update the GUID in the reconciler because it will be
+ // referenced later in the sync process.
+ let state = this.reconciler.getAddonStateFromSyncGUID(oldID);
+ if (state) {
+ state.guid = newID;
+ await this.reconciler.saveState();
+ }
+
+ let addon = await this.getAddonByGUID(oldID);
+ if (!addon) {
+ this._log.debug(
+ "Cannot change item ID (" +
+ oldID +
+ ") in Add-on " +
+ "Manager because old add-on not present: " +
+ oldID
+ );
+ return;
+ }
+
+ addon.syncGUID = newID;
+ },
+
+ /**
+ * Obtain the set of all syncable add-on Sync GUIDs.
+ *
+ * This implements a core Store API.
+ */
+ async getAllIDs() {
+ let ids = {};
+
+ let addons = this.reconciler.addons;
+ for (let id in addons) {
+ let addon = addons[id];
+ if (await this.isAddonSyncable(addon)) {
+ ids[addon.guid] = true;
+ }
+ }
+
+ return ids;
+ },
+
+ /**
+ * Wipe engine data.
+ *
+ * This uninstalls all syncable addons from the application. In case of
+ * error, it logs the error and keeps trying with other add-ons.
+ */
+ async wipe() {
+ this._log.info("Processing wipe.");
+
+ await this.engine._refreshReconcilerState();
+
+ // We only wipe syncable add-ons. Wipe is a Sync feature not a security
+ // feature.
+ let ids = await this.getAllIDs();
+ for (let guid in ids) {
+ let addon = await this.getAddonByGUID(guid);
+ if (!addon) {
+ this._log.debug(
+ "Ignoring add-on because it couldn't be obtained: " + guid
+ );
+ continue;
+ }
+
+ this._log.info("Uninstalling add-on as part of wipe: " + addon.id);
+ await Utils.catch.call(this, () => addon.uninstall())();
+ }
+ },
+
+ /** *************************************************************************
+ * Functions below are unique to this store and not part of the Store API *
+ ***************************************************************************/
+
+ /**
+ * Obtain an add-on from its public ID.
+ *
+ * @param id
+ * Add-on ID
+ * @return Addon or undefined if not found
+ */
+ async getAddonByID(id) {
+ return lazy.AddonManager.getAddonByID(id);
+ },
+
+ /**
+ * Obtain an add-on from its Sync GUID.
+ *
+ * @param guid
+ * Add-on Sync GUID
+ * @return DBAddonInternal or null
+ */
+ async getAddonByGUID(guid) {
+ return lazy.AddonManager.getAddonBySyncGUID(guid);
+ },
+
+ /**
+ * Determines whether an add-on is suitable for Sync.
+ *
+ * @param addon
+ * Addon instance
+ * @param ignoreRepoCheck
+ * Should we skip checking the Addons repository (primarially useful
+ * for testing and validation).
+ * @return Boolean indicating whether it is appropriate for Sync
+ */
+ async isAddonSyncable(addon, ignoreRepoCheck = false) {
+ // Currently, we limit syncable add-ons to those that are:
+ // 1) In a well-defined set of types
+ // 2) Installed in the current profile
+ // 3) Not installed by a foreign entity (i.e. installed by the app)
+ // since they act like global extensions.
+ // 4) Is not a hotfix.
+ // 5) The addons XPIProvider doesn't veto it (i.e not being installed in
+ // the profile directory, or any other reasons it says the addon can't
+ // be synced)
+ // 6) Are installed from AMO
+
+ // We could represent the test as a complex boolean expression. We go the
+ // verbose route so the failure reason is logged.
+ if (!addon) {
+ this._log.debug("Null object passed to isAddonSyncable.");
+ return false;
+ }
+
+ if (!this._syncableTypes.includes(addon.type)) {
+ this._log.debug(
+ addon.id + " not syncable: type not in allowed list: " + addon.type
+ );
+ return false;
+ }
+
+ if (!(addon.scope & lazy.AddonManager.SCOPE_PROFILE)) {
+ this._log.debug(addon.id + " not syncable: not installed in profile.");
+ return false;
+ }
+
+ // If the addon manager says it's not syncable, we skip it.
+ if (!addon.isSyncable) {
+ this._log.debug(addon.id + " not syncable: vetoed by the addon manager.");
+ return false;
+ }
+
+ // This may be too aggressive. If an add-on is downloaded from AMO and
+ // manually placed in the profile directory, foreignInstall will be set.
+ // Arguably, that add-on should be syncable.
+ // TODO Address the edge case and come up with more robust heuristics.
+ if (addon.foreignInstall) {
+ this._log.debug(addon.id + " not syncable: is foreign install.");
+ return false;
+ }
+
+ // If the AddonRepository's cache isn't enabled (which it typically isn't
+ // in tests), getCachedAddonByID always returns null - so skip the check
+ // in that case. We also provide a way to specifically opt-out of the check
+ // even if the cache is enabled, which is used by the validators.
+ if (ignoreRepoCheck || !lazy.AddonRepository.cacheEnabled) {
+ return true;
+ }
+
+ let result = await new Promise(res => {
+ lazy.AddonRepository.getCachedAddonByID(addon.id, res);
+ });
+
+ if (!result) {
+ this._log.debug(
+ addon.id + " not syncable: add-on not found in add-on repository."
+ );
+ return false;
+ }
+
+ return this.isSourceURITrusted(result.sourceURI);
+ },
+
+ /**
+ * Determine whether an add-on's sourceURI field is trusted and the add-on
+ * can be installed.
+ *
+ * This function should only ever be called from isAddonSyncable(). It is
+ * exposed as a separate function to make testing easier.
+ *
+ * @param uri
+ * nsIURI instance to validate
+ * @return bool
+ */
+ isSourceURITrusted: function isSourceURITrusted(uri) {
+ // For security reasons, we currently limit synced add-ons to those
+ // installed from trusted hostname(s). We additionally require TLS with
+ // the add-ons site to help prevent forgeries.
+ let trustedHostnames = Svc.PrefBranch.getStringPref(
+ "addons.trustedSourceHostnames",
+ ""
+ ).split(",");
+
+ if (!uri) {
+ this._log.debug("Undefined argument to isSourceURITrusted().");
+ return false;
+ }
+
+ // Scheme is validated before the hostname because uri.host may not be
+ // populated for certain schemes. It appears to always be populated for
+ // https, so we avoid the potential NS_ERROR_FAILURE on field access.
+ if (uri.scheme != "https") {
+ this._log.debug("Source URI not HTTPS: " + uri.spec);
+ return false;
+ }
+
+ if (!trustedHostnames.includes(uri.host)) {
+ this._log.debug("Source hostname not trusted: " + uri.host);
+ return false;
+ }
+
+ return true;
+ },
+
+ /**
+ * Update the userDisabled flag on an add-on.
+ *
+ * This will enable or disable an add-on. It has no return value and does
+ * not catch or handle exceptions thrown by the addon manager. If no action
+ * is needed it will return immediately.
+ *
+ * @param addon
+ * Addon instance to manipulate.
+ * @param value
+ * Boolean to which to set userDisabled on the passed Addon.
+ */
+ async updateUserDisabled(addon, value) {
+ if (addon.userDisabled == value) {
+ return;
+ }
+
+ // A pref allows changes to the enabled flag to be ignored.
+ if (Svc.PrefBranch.getBoolPref("addons.ignoreUserEnabledChanges", false)) {
+ this._log.info(
+ "Ignoring enabled state change due to preference: " + addon.id
+ );
+ return;
+ }
+
+ AddonUtils.updateUserDisabled(addon, value);
+ // updating this flag doesn't send a notification for appDisabled addons,
+ // meaning the reconciler will not update its state and may resync the
+ // addon - so explicitly rectify the state (bug 1366994)
+ if (addon.appDisabled) {
+ await this.reconciler.rectifyStateFromAddon(addon);
+ }
+ },
+};
+
+Object.setPrototypeOf(AddonsStore.prototype, Store.prototype);
+
+/**
+ * The add-ons tracker keeps track of real-time changes to add-ons.
+ *
+ * It hooks up to the reconciler and receives notifications directly from it.
+ */
+function AddonsTracker(name, engine) {
+ LegacyTracker.call(this, name, engine);
+}
+AddonsTracker.prototype = {
+ get reconciler() {
+ return this.engine._reconciler;
+ },
+
+ get store() {
+ return this.engine._store;
+ },
+
+ /**
+ * This callback is executed whenever the AddonsReconciler sends out a change
+ * notification. See AddonsReconciler.addChangeListener().
+ */
+ async changeListener(date, change, addon) {
+ this._log.debug("changeListener invoked: " + change + " " + addon.id);
+ // Ignore changes that occur during sync.
+ if (this.ignoreAll) {
+ return;
+ }
+
+ if (!(await this.store.isAddonSyncable(addon))) {
+ this._log.debug(
+ "Ignoring change because add-on isn't syncable: " + addon.id
+ );
+ return;
+ }
+
+ const added = await this.addChangedID(addon.guid, date.getTime() / 1000);
+ if (added) {
+ this.score += SCORE_INCREMENT_XLARGE;
+ }
+ },
+
+ onStart() {
+ this.reconciler.startListening();
+ this.reconciler.addChangeListener(this);
+ },
+
+ onStop() {
+ this.reconciler.removeChangeListener(this);
+ this.reconciler.stopListening();
+ },
+};
+
+Object.setPrototypeOf(AddonsTracker.prototype, LegacyTracker.prototype);
+
+export class AddonValidator extends CollectionValidator {
+ constructor(engine = null) {
+ super("addons", "id", ["addonID", "enabled", "applicationID", "source"]);
+ this.engine = engine;
+ }
+
+ async getClientItems() {
+ return lazy.AddonManager.getAllAddons();
+ }
+
+ normalizeClientItem(item) {
+ let enabled = !item.userDisabled;
+ if (item.pendingOperations & lazy.AddonManager.PENDING_ENABLE) {
+ enabled = true;
+ } else if (item.pendingOperations & lazy.AddonManager.PENDING_DISABLE) {
+ enabled = false;
+ }
+ return {
+ enabled,
+ id: item.syncGUID,
+ addonID: item.id,
+ applicationID: Services.appinfo.ID,
+ source: "amo", // check item.foreignInstall?
+ original: item,
+ };
+ }
+
+ async normalizeServerItem(item) {
+ let guid = await this.engine._findDupe(item);
+ if (guid) {
+ item.id = guid;
+ }
+ return item;
+ }
+
+ clientUnderstands(item) {
+ return item.applicationID === Services.appinfo.ID;
+ }
+
+ async syncedByClient(item) {
+ return (
+ !item.original.hidden &&
+ !item.original.isSystem &&
+ !(
+ item.original.pendingOperations & lazy.AddonManager.PENDING_UNINSTALL
+ ) &&
+ // No need to await the returned promise explicitely:
+ // |expr1 && expr2| evaluates to expr2 if expr1 is true.
+ this.engine.isAddonSyncable(item.original, true)
+ );
+ }
+}