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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/. */
/**
* Firefox Accounts Profile helper.
*
* This class abstracts interaction with the profile server for an account.
* It will handle things like fetching profile data, listening for updates to
* the user's profile in open browser tabs, and cacheing/invalidating profile data.
*/
import {
ON_PROFILE_CHANGE_NOTIFICATION,
log,
} from "resource://gre/modules/FxAccountsCommon.sys.mjs";
import { getFxAccountsSingleton } from "resource://gre/modules/FxAccounts.sys.mjs";
const fxAccounts = getFxAccountsSingleton();
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
FxAccountsProfileClient:
"resource://gre/modules/FxAccountsProfileClient.sys.mjs",
});
export var FxAccountsProfile = function (options = {}) {
this._currentFetchPromise = null;
this._cachedAt = 0; // when we saved the cached version.
this._isNotifying = false; // are we sending a notification?
this.fxai = options.fxai || fxAccounts._internal;
this.client =
options.profileClient ||
new lazy.FxAccountsProfileClient({
fxai: this.fxai,
serverURL: options.profileServerUrl,
});
// An observer to invalidate our _cachedAt optimization. We use a weak-ref
// just incase this.tearDown isn't called in some cases.
Services.obs.addObserver(this, ON_PROFILE_CHANGE_NOTIFICATION, true);
// for testing
if (options.channel) {
this.channel = options.channel;
}
};
FxAccountsProfile.prototype = {
// If we get subsequent requests for a profile within this period, don't bother
// making another request to determine if it is fresh or not.
PROFILE_FRESHNESS_THRESHOLD: 120000, // 2 minutes
observe(subject, topic, data) {
// If we get a profile change notification from our webchannel it means
// the user has just changed their profile via the web, so we want to
// ignore our "freshness threshold"
if (topic == ON_PROFILE_CHANGE_NOTIFICATION && !this._isNotifying) {
log.debug("FxAccountsProfile observed profile change");
this._cachedAt = 0;
}
},
tearDown() {
this.fxai = null;
this.client = null;
Services.obs.removeObserver(this, ON_PROFILE_CHANGE_NOTIFICATION);
},
_notifyProfileChange(uid) {
this._isNotifying = true;
Services.obs.notifyObservers(null, ON_PROFILE_CHANGE_NOTIFICATION, uid);
this._isNotifying = false;
},
// Cache fetched data and send out a notification so that UI can update.
_cacheProfile(response) {
return this.fxai.withCurrentAccountState(async state => {
const profile = response.body;
const userData = await state.getUserAccountData();
if (profile.uid != userData.uid) {
throw new Error(
"The fetched profile does not correspond with the current account."
);
}
let profileCache = {
profile,
etag: response.etag,
};
await state.updateUserAccountData({ profileCache });
if (profile.email != userData.email) {
await this.fxai._handleEmailUpdated(profile.email);
}
log.debug("notifying profile changed for user ${uid}", userData);
this._notifyProfileChange(userData.uid);
return profile;
});
},
async _getProfileCache() {
let data = await this.fxai.currentAccountState.getUserAccountData([
"profileCache",
]);
return data ? data.profileCache : null;
},
async _fetchAndCacheProfileInternal() {
try {
const profileCache = await this._getProfileCache();
const etag = profileCache ? profileCache.etag : null;
let response;
try {
response = await this.client.fetchProfile(etag);
} catch (err) {
await this.fxai._handleTokenError(err);
// _handleTokenError always re-throws.
throw new Error("not reached!");
}
// response may be null if the profile was not modified (same ETag).
if (!response) {
return null;
}
return await this._cacheProfile(response);
} finally {
this._cachedAt = Date.now();
this._currentFetchPromise = null;
}
},
_fetchAndCacheProfile() {
if (!this._currentFetchPromise) {
this._currentFetchPromise = this._fetchAndCacheProfileInternal();
}
return this._currentFetchPromise;
},
// Returns cached data right away if available, otherwise returns null - if
// it returns null, or if the profile is possibly stale, it attempts to
// fetch the latest profile data in the background. After data is fetched a
// notification will be sent out if the profile has changed.
async getProfile() {
const profileCache = await this._getProfileCache();
if (!profileCache) {
// fetch and cache it in the background.
this._fetchAndCacheProfile().catch(err => {
log.error("Background refresh of initial profile failed", err);
});
return null;
}
if (Date.now() > this._cachedAt + this.PROFILE_FRESHNESS_THRESHOLD) {
// Note that _fetchAndCacheProfile isn't returned, so continues
// in the background.
this._fetchAndCacheProfile().catch(err => {
log.error("Background refresh of profile failed", err);
});
} else {
log.trace("not checking freshness of profile as it remains recent");
}
return profileCache.profile;
},
// Get the user's profile data, fetching from the network if necessary.
// Most callers should instead use `getProfile()`; this methods exists to support
// callers who need to await the underlying network request.
async ensureProfile({ staleOk = false, forceFresh = false } = {}) {
if (staleOk && forceFresh) {
throw new Error("contradictory options specified");
}
const profileCache = await this._getProfileCache();
if (
forceFresh ||
!profileCache ||
(Date.now() > this._cachedAt + this.PROFILE_FRESHNESS_THRESHOLD &&
!staleOk)
) {
const profile = await this._fetchAndCacheProfile().catch(err => {
log.error("Background refresh of profile failed", err);
});
if (profile) {
return profile;
}
}
log.trace("not checking freshness of profile as it remains recent");
return profileCache ? profileCache.profile : null;
},
QueryInterface: ChromeUtils.generateQI([
"nsIObserver",
"nsISupportsWeakReference",
]),
};
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