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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/. */
/**
* The pivot language is used to pivot between two different language translations
* when there is not a model available to translate directly between the two. In this
* case "en" is common between the various supported models.
*
* For instance given the following two models:
* "fr" -> "en"
* "en" -> "it"
*
* You can accomplish:
* "fr" -> "it"
*
* By doing:
* "fr" -> "en" -> "it"
*/
const PIVOT_LANGUAGE = "en";
const TRANSLATIONS_PERMISSION = "translations";
const ALWAYS_TRANSLATE_LANGS_PREF =
"browser.translations.alwaysTranslateLanguages";
const NEVER_TRANSLATE_LANGS_PREF =
"browser.translations.neverTranslateLanguages";
const lazy = {};
import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
if (AppConstants.ENABLE_WEBDRIVER) {
XPCOMUtils.defineLazyServiceGetter(
lazy,
"Marionette",
"@mozilla.org/remote/marionette;1",
"nsIMarionette"
);
XPCOMUtils.defineLazyServiceGetter(
lazy,
"RemoteAgent",
"@mozilla.org/remote/agent;1",
"nsIRemoteAgent"
);
} else {
lazy.Marionette = { running: false };
lazy.RemoteAgent = { running: false };
}
XPCOMUtils.defineLazyServiceGetters(lazy, {
BrowserHandler: ["@mozilla.org/browser/clh;1", "nsIBrowserHandler"],
});
ChromeUtils.defineESModuleGetters(lazy, {
setTimeout: "resource://gre/modules/Timer.sys.mjs",
TranslationsTelemetry:
"chrome://global/content/translations/TranslationsTelemetry.sys.mjs",
EngineProcess: "chrome://global/content/ml/EngineProcess.sys.mjs",
});
ChromeUtils.defineLazyGetter(lazy, "console", () => {
return console.createInstance({
maxLogLevelPref: "browser.translations.logLevel",
prefix: "Translations",
});
});
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"translationsEnabledPref",
"browser.translations.enable"
);
/**
* Retrieves the most recent target languages that have been requested for translation by the user.
* Inserting into this pref should be managed by the static TranslationsParent class.
*
* @see {TranslationsParent.storeMostRecentTargetLanguage}
*
* There is a linear chain of synchronously dependent observers related to this pref.
*
* When this pref's value is updated, it sends "translations:most-recent-target-language-changed"
* which is observed by the static global TranslationsParent object to know when to clear its cache.
*
* Once the cache has been cleared, the static global TranslationsParent object then sends
* "translations:maybe-update-user-lang-tag" which is observed by every instantiated TranslationsParent
* actor object to consider updating their cached userLangTag.
*
* @see {TranslationsParent} for further descriptions and diagrams.
*/
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"mostRecentTargetLanguages",
"browser.translations.mostRecentTargetLanguages",
/* aDefaultValue */ "",
/* aOnUpdate */ () => {
Services.obs.notifyObservers(
null,
"translations:most-recent-target-language-changed"
);
},
/* aTransform */ rawLangTags =>
rawLangTags ? new Set(rawLangTags.split(",")) : new Set()
);
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"chaosErrorsPref",
"browser.translations.chaos.errors"
);
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"chaosTimeoutMSPref",
"browser.translations.chaos.timeoutMS"
);
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"automaticallyPopupPref",
"browser.translations.automaticallyPopup"
);
/**
* Returns the always-translate language tags as an array.
*/
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"alwaysTranslateLangTags",
ALWAYS_TRANSLATE_LANGS_PREF,
/* aDefaultPrefValue */ "",
/* onUpdate */ () =>
Services.obs.notifyObservers(
null,
"translations:always-translate-languages-changed"
),
/* aTransform */ rawLangTags =>
rawLangTags ? new Set(rawLangTags.split(",")) : new Set()
);
/**
* Returns the never-translate language tags as an array.
*/
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"neverTranslateLangTags",
NEVER_TRANSLATE_LANGS_PREF,
/* aDefaultPrefValue */ "",
/* onUpdate */ () =>
Services.obs.notifyObservers(
null,
"translations:never-translate-languages-changed"
),
/* aTransform */ rawLangTags =>
rawLangTags ? new Set(rawLangTags.split(",")) : new Set()
);
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"simulateUnsupportedEnginePref",
"browser.translations.simulateUnsupportedEngine"
);
// At this time the signatures of the files are not being checked when they are being
// loaded from disk. This signature check involves hitting the network, and translations
// are explicitly an offline-capable feature. See Bug 1827265 for re-enabling this
// check.
const VERIFY_SIGNATURES_FROM_FS = false;
/**
* @typedef {import("../translations").TranslationModelRecord} TranslationModelRecord
* @typedef {import("../translations").RemoteSettingsClient} RemoteSettingsClient
* @typedef {import("../translations").LanguageTranslationModelFiles} LanguageTranslationModelFiles
* @typedef {import("../translations").WasmRecord} WasmRecord
* @typedef {import("../translations").LangTags} LangTags
* @typedef {import("../translations").LanguagePair} LanguagePair
* @typedef {import("../translations").SupportedLanguages} SupportedLanguages
* @typedef {import("../translations").TranslationErrors} TranslationErrors
*/
/**
* @typedef {object} TranslationPair
* @property {string} fromLanguage
* @property {string} toLanguage
* @property {string} [fromDisplayLanguage]
* @property {string} [toDisplayLanguage]
*/
/**
* The state that is stored per a "top" ChromeWindow. This "top" ChromeWindow is the JS
* global associated with a browser window. Some state is unique to a browser window, and
* using the top ChromeWindow is a unique key that ensures the state will be unique to
* that browser window.
*
* See BrowsingContext.webidl for information on the "top"
* See the TranslationsParent JSDoc for more information on the state management.
*/
class StatePerTopChromeWindow {
/**
* The storage backing for the states.
*
* @type {WeakMap<ChromeWindow, StatePerTopChromeWindow>}
*/
static #states = new WeakMap();
/**
* When reloading the page, store the translation pair that needs translating.
*
* @type {null | TranslationPair}
*/
translateOnPageReload = null;
/**
* The page may auto-translate due to user settings. On a page restore, always
* skip the page restore logic.
*
* @type {boolean}
*/
isPageRestored = false;
/**
* Remember the detected languages on a page reload. This will keep the translations
* button from disappearing and reappearing, which causes the button to lose focus.
*
* @type {LangTags | null} previousDetectedLanguages
*/
previousDetectedLanguages = null;
static #id = 0;
/**
* @param {ChromeWindow} topChromeWindow
*/
constructor(topChromeWindow) {
this.id = StatePerTopChromeWindow.#id++;
StatePerTopChromeWindow.#states.set(topChromeWindow, this);
}
/**
* @param {ChromeWindow} topChromeWindow
* @returns {StatePerTopChromeWindow}
*/
static getOrCreate(topChromeWindow) {
let state = StatePerTopChromeWindow.#states.get(topChromeWindow);
if (state) {
return state;
}
state = new StatePerTopChromeWindow(topChromeWindow);
StatePerTopChromeWindow.#states.set(topChromeWindow, state);
return state;
}
}
/**
* The TranslationsParent is used to orchestrate translations in Firefox. It can
* download the Wasm translation engine, and the language models. It manages the life
* cycle for offering and performing translations.
*
* Care must be taken for the life cycle of the state management and data caching. The
* following examples use a fictitious `myState` property to show how state can be stored.
*
* There is only 1 TranslationsParent static class in the parent process. At this
* layer it is safe to store things like translation models and general browser
* configuration as these don't change across browser windows. This is accessed like
* `TranslationsParent.myState`
*
* The next layer down are the top ChromeWindows. These map to the UI and user's conception
* of a browser window, such as what you would get by hitting cmd+n or ctrl+n to get a new
* browser window. State such as whether a page is reloaded or general navigation events
* must be unique per ChromeWindow. State here is stored in the `StatePerTopChromeWindow`
* abstraction, like `this.getWindowState().myState`. This layer also consists of a
* `FullPageTranslationsPanel` instance per top ChromeWindow (at least on Desktop).
*
* The final layer consists of the multiple tabs and navigation history inside of a
* ChromeWindow. Data for this layer is safe to store on the TranslationsParent instance,
* like `this.myState`.
*
* Below is an ascii diagram of this relationship.
*
* ┌─────────────────────────────────────────────────────────────────────────────┐
* │ static TranslationsParent │
* └─────────────────────────────────────────────────────────────────────────────┘
* | |
* v v
* ┌──────────────────────────────────────┐ ┌──────────────────────────────────────┐
* │ top ChromeWindow │ │ top ChromeWindow │
* │ (FullPageTranslationsPanel instance) │ │ (FullPageTranslationsPanel instance) │
* └──────────────────────────────────────┘ └──────────────────────────────────────┘
* | | | | | |
* v v v v v v
* ┌────────────────────┐ ┌─────┐ ┌─────┐ ┌────────────────────┐ ┌─────┐ ┌─────┐
* │ TranslationsParent │ │ ... │ │ ... │ │ TranslationsParent │ │ ... │ │ ... │
* │ (actor instance) │ │ │ │ │ │ (actor instance) │ │ │ │ │
* └────────────────────┘ └─────┘ └─────┘ └────────────────────┘ └─────┘ └─────┘
*/
export class TranslationsParent extends JSWindowActorParent {
/**
* The following constants control the major version for assets downloaded from
* Remote Settings. When a breaking change is introduced, Nightly will have these
* numbers incremented by one, but Beta and Release will still be on the previous
* version. Remote Settings will ship both versions of the records, and the latest
* asset released in that version will be used. For instance, with a major version
* of "1", assets can be downloaded for "1.0", "1.2", "1.3beta", but assets marked
* as "2.0", "2.1", etc will not be downloaded.
*
* Release docs:
*/
static BERGAMOT_MAJOR_VERSION = 1;
static LANGUAGE_MODEL_MAJOR_VERSION = 1;
/**
* Contains the state that would affect UI. Anytime this state is changed, a dispatch
* event is sent so that UI can react to it. The actor is inside of /toolkit and
* needs a way of notifying /browser code (or other users) of when the state changes.
*
* @type {TranslationsLanguageState}
*/
languageState;
/**
* Allows the TranslationsEngineParent to resolve an engine once it is ready.
*
* @type {null | () => TranslationsEngineParent}
*/
resolveEngine = null;
/**
* The cached URI spec where the panel was first ever shown, as determined by the
* browser.translations.panelShown pref.
*
* Holding on to this URI value allows us to show the introductory message in the panel
* when the panel opens, as long as the active panel is open on that particular URI.
*
* @type {string | null}
*/
firstShowUriSpec = null;
/**
* Do not send queries or do work when the actor is already destroyed. This flag needs
* to be checked after calls to `await`.
*/
#isDestroyed = false;
/**
* There is only one static TranslationsParent for all of the top ChromeWindows.
* The top ChromeWindow maps to the user's conception of a window such as when you hit
* cmd+n or ctrl+n.
*
* @returns {StatePerTopChromeWindow}
*/
getWindowState() {
const state = StatePerTopChromeWindow.getOrCreate(
this.browsingContext.top.embedderWindowGlobal
);
return state;
}
actorCreated() {
this.innerWindowId = this.browsingContext.top.embedderElement.innerWindowID;
const windowState = this.getWindowState();
this.languageState = new TranslationsLanguageState(
this,
windowState.previousDetectedLanguages
);
windowState.previousDetectedLanguages = null;
// Attach a closure to this so that we can remove the observer when didDestroy() is called.
this.maybeUpdateUserLangTag = () => {
const langTag = TranslationsParent.getPreferredLanguages({
excludeLangTags: [this.languageState.detectedLanguages?.docLangTag],
})[0];
this.languageState.maybeUpdateUserLangTag(langTag);
};
Services.obs.addObserver(
this.maybeUpdateUserLangTag,
"translations:maybe-update-user-lang-tag"
);
if (windowState.translateOnPageReload) {
// The actor was recreated after a page reload, start the translation.
const { fromLanguage, toLanguage } = windowState.translateOnPageReload;
windowState.translateOnPageReload = null;
lazy.console.log(
`Translating on a page reload from "${fromLanguage}" to "${toLanguage}".`
);
this.translate(
fromLanguage,
toLanguage,
false // reportAsAutoTranslate
);
}
}
/**
* A map of the TranslationModelRecord["id"] to the record of the model in Remote Settings.
* Used to coordinate the downloads.
*
* @type {null | Promise<Map<string, TranslationModelRecord>>}
*/
static #translationModelRecords = null;
/**
* The RemoteSettingsClient that downloads the translation models.
*
* @type {RemoteSettingsClient | null}
*/
static #translationModelsRemoteClient = null;
/**
* The RemoteSettingsClient that downloads the wasm binaries.
*
* @type {RemoteSettingsClient | null}
*/
static #translationsWasmRemoteClient = null;
/**
* Allows the actor's behavior to be changed when the translations engine is mocked via
* a dummy RemoteSettingsClient.
*
* @type {bool}
*/
static #isTranslationsEngineMocked = false;
/**
* @type {null | Promise<boolean>}
*/
static #isTranslationsEngineSupported = null;
/**
* An ordered list of preferred languages based on:
*
* 1. Most recent target languages
* 2. Web requested languages
* 3. App languages
* 4. OS language
*
* This is the composition of #mostRecentTargetLanguages and #userSettingsLanguages
*
* @type {null | string[]}
*/
static #preferredLanguages = null;
/**
* An ordered list of the most recently translated-into target languages.
*
* @type {null | string[]}
*/
static #mostRecentTargetLanguages = null;
/**
* An ordered list of languages specified in the user's settings based on:
*
* 1. Web requested languages
* 2. App languages
* 3. OS languages
*
* @type {null | string[]}
*/
static #userSettingsLanguages = null;
/**
* The value of navigator.languages.
*
* @type {null | Set<string>}
*/
static #webContentLanguages = null;
static #observingLanguages = false;
// On a fast connection, 10 concurrent downloads were measured to be the fastest when
// downloading all of the language files.
static MAX_CONCURRENT_DOWNLOADS = 10;
static MAX_DOWNLOAD_RETRIES = 3;
// The set of hosts that have already been offered for translations.
static #hostsOffered = new Set();
// Enable the translations popup offer in tests.
static testAutomaticPopup = false;
/**
* Gecko preference for always translating a language.
*
* @type {string}
*/
static ALWAYS_TRANSLATE_LANGS_PREF = ALWAYS_TRANSLATE_LANGS_PREF;
/**
* Gecko preference for never translating a language.
*
* @type {string}
*/
static NEVER_TRANSLATE_LANGS_PREF = NEVER_TRANSLATE_LANGS_PREF;
/**
* Telemetry functions for Translations
*
* @returns {TranslationsTelemetry}
*/
static telemetry() {
return lazy.TranslationsTelemetry;
}
/**
* TODO(Bug 1834306) - Cu.isInAutomation doesn't recognize Marionette and RemoteAgent
* tests.
*/
static isInAutomation() {
return (
Cu.isInAutomation || lazy.Marionette.running || lazy.RemoteAgent.running
);
}
/**
* Returns whether the Translations Engine is mocked for testing.
*
* @returns {boolean}
*/
static isTranslationsEngineMocked() {
return TranslationsParent.#isTranslationsEngineMocked;
}
/**
* Offer translations (for instance by automatically opening the popup panel) whenever
* languages are detected, but only do it once per host per session.
*
* @param {LangTags} detectedLanguages
*/
maybeOfferTranslations(detectedLanguages) {
if (!this.browsingContext.currentWindowGlobal) {
return;
}
if (!lazy.automaticallyPopupPref) {
return;
}
// On Android the BrowserHandler is intermittently not available (for unknown reasons).
// Check that the component is available before de-lazifying lazy.BrowserHandler.
if (Cc["@mozilla.org/browser/clh;1"] && lazy.BrowserHandler?.kiosk) {
// Pop-ups should not be shown in kiosk mode.
return;
}
const { documentURI } = this.browsingContext.currentWindowGlobal;
if (
TranslationsParent.isInAutomation() &&
!TranslationsParent.testAutomaticPopup
) {
// Do not offer translations in automation, as many tests do not expect this
// behavior.
lazy.console.log(
"maybeOfferTranslations - Do not offer translations in automation.",
documentURI.spec
);
return;
}
if (
!detectedLanguages.docLangTag ||
!detectedLanguages.userLangTag ||
!detectedLanguages.isDocLangTagSupported
) {
lazy.console.log(
"maybeOfferTranslations - The detected languages were not supported.",
detectedLanguages
);
return;
}
let host;
try {
host = documentURI.host;
} catch {
// nsIURI.host can throw if the URI scheme doesn't have a host. In this case
// do not offer a translation.
return;
}
if (TranslationsParent.#hostsOffered.has(host)) {
// This host was already offered a translation.
lazy.console.log(
"maybeOfferTranslations - Host already offered a translation, so skip.",
documentURI.spec
);
return;
}
const browser = this.browsingContext.top.embedderElement;
if (!browser) {
return;
}
TranslationsParent.#hostsOffered.add(host);
const { CustomEvent } = browser.ownerGlobal;
if (
TranslationsParent.shouldNeverTranslateLanguage(
detectedLanguages.docLangTag
)
) {
lazy.console.log(
`maybeOfferTranslations - Should never translate language. "${detectedLanguages.docLangTag}"`,
documentURI.spec
);
return;
}
if (this.shouldNeverTranslateSite()) {
lazy.console.log(
"maybeOfferTranslations - Should never translate site.",
documentURI.spec
);
return;
}
if (detectedLanguages.docLangTag === detectedLanguages.userLangTag) {
lazy.console.error(
"maybeOfferTranslations - The document and user lang tag are the same, not offering a translation.",
documentURI.spec
);
return;
}
// Only offer the translation if it's still the current page.
let isCurrentPage = false;
if (AppConstants.platform !== "android") {
isCurrentPage =
documentURI.spec ===
this.browsingContext.topChromeWindow.gBrowser.selectedBrowser
.documentURI.spec;
} else {
// In Android, the active window is the active tab.
isCurrentPage = documentURI.spec === browser.documentURI.spec;
}
if (isCurrentPage) {
lazy.console.log(
"maybeOfferTranslations - Offering a translation",
documentURI.spec,
detectedLanguages
);
browser.dispatchEvent(
new CustomEvent("TranslationsParent:OfferTranslation", {
bubbles: true,
})
);
}
}
/**
* This is for testing purposes.
*/
static resetHostsOffered() {
TranslationsParent.#hostsOffered = new Set();
}
/**
* Returns the word count of the text for a given language.
*
* @param {string} langTag - A BCP-47 language tag.
* @param {string} text - The text for which to count words.
*
* @returns {number} - The count of words in the text.
* @throws If a segmenter could not be created for the given language tag.
*/
static countWords(langTag, text) {
const segmenter = new Intl.Segmenter(langTag, { granularity: "word" });
const segments = Array.from(segmenter.segment(text));
return segments.filter(segment => segment.isWordLike).length;
}
/**
* Retrieves the Translations actor from the current browser context.
*
* @param {object} browser - The browser object from which to get the context.
*
* @returns {object} The Translations actor for handling translation actions.
* @throws {Error} Throws an error if the TranslationsParent actor cannot be found.
*/
static getTranslationsActor(browser) {
const actor =
browser.browsingContext.currentWindowGlobal.getActor("Translations");
if (!actor) {
throw new Error("Unable to get the TranslationsParent actor.");
}
return actor;
}
/**
* Detect if Wasm SIMD is supported, and cache the value. It's better to check
* for support before downloading large binary blobs to a user who can't even
* use the feature. This function also respects mocks and simulating unsupported
* engines.
*
* @type {boolean}
*/
static getIsTranslationsEngineSupported() {
if (lazy.simulateUnsupportedEnginePref) {
// Use the non-lazy console.log so that the user is always informed as to why
// the translations engine is not working.
console.log(
"Translations: The translations engine is disabled through the pref " +
'"browser.translations.simulateUnsupportedEngine".'
);
// The user is manually testing unsupported engines.
return false;
}
if (TranslationsParent.#isTranslationsEngineMocked) {
// A mocked translations engine is always supported.
return true;
}
if (TranslationsParent.#isTranslationsEngineSupported === null) {
TranslationsParent.#isTranslationsEngineSupported = detectSimdSupport();
}
return TranslationsParent.#isTranslationsEngineSupported;
}
/**
* Only translate pages that match certain protocols, that way internal pages like
* about:* pages will not be translated. Keep this logic up to date with the "matches"
* array in the `toolkit/modules/ActorManagerParent.sys.mjs` definition.
*
* @param {object} gBrowser
* @returns {boolean}
*/
static isFullPageTranslationsRestrictedForPage(gBrowser) {
const contentType = gBrowser.selectedBrowser.documentContentType;
const scheme = gBrowser.currentURI.scheme;
if (contentType === "application/pdf") {
return true;
}
// Keep this logic up to date with the "matches" array in the
// `toolkit/modules/ActorManagerParent.sys.mjs` definition.
switch (scheme) {
case "https":
case "http":
case "file":
return false;
}
return true;
}
/**
* Invalidates the #mostRecentTargetLanguages portion of #preferredLanguages.
*
* This means that the next time getPreferredLanguages() is called, it will
* need to re-fetch the mostRecentTargetLanguages, but it may still use a
* cached version of userSettingsLanguages.
*
* @see {getPreferredLanguages}
*/
static #invalidateMostRecentTargetLanguages() {
TranslationsParent.#mostRecentTargetLanguages = null;
TranslationsParent.#preferredLanguages = null;
}
/**
* Invalidates the #userSettingsLanguages portion of #preferredLanguages.
*
* This means that the next time getPreferredLanguages() is called, it will
* need to re-fetch the userSettingsLanguages, but it may still use a
* cached version of mostRecentTargetLanguages.
*
* @see {getPreferredLanguages}
*/
static #invalidateUserSettingsLanguages() {
TranslationsParent.#webContentLanguages = null;
TranslationsParent.#userSettingsLanguages = null;
TranslationsParent.#preferredLanguages = null;
}
/**
* Provide a way for tests to override the system locales.
*
* @type {null | string[]}
*/
static mockedSystemLocales = null;
/**
* The "Accept-Language" values that the localizer or user has indicated for
*
* Note that this preference always has English in the fallback chain, even if the
* user doesn't actually speak English, and to other languages they potentially do
* not speak. However, this preference will be used as an indication that a user may
* prefer this language.
*
*/
static getWebContentLanguages() {
if (!TranslationsParent.#webContentLanguages) {
const values = Services.prefs
.getComplexValue("intl.accept_languages", Ci.nsIPrefLocalizedString)
.data.split(/\s*,\s*/g);
TranslationsParent.#webContentLanguages = new Set();
for (const locale of values) {
try {
// Wrap this in a try statement since users can manually edit this pref.
TranslationsParent.#webContentLanguages.add(
new Intl.Locale(locale).language
);
} catch {
// The locale was invalid, discard it.
}
}
if (
!Services.prefs.prefHasUserValue("intl.accept_languages") &&
Services.locale.appLocaleAsBCP47 !== "en" &&
!Services.locale.appLocaleAsBCP47.startsWith("en-")
) {
// The user hasn't customized their accept languages, this means that English
// is always provided as a fallback language, even if it is not available.
TranslationsParent.#webContentLanguages.delete("en");
}
if (TranslationsParent.#webContentLanguages.size === 0) {
// The user has removed all of their web content languages, default to the
// app locale.
TranslationsParent.#webContentLanguages.add(
new Intl.Locale(Services.locale.appLocaleAsBCP47).language
);
}
}
return TranslationsParent.#webContentLanguages;
}
/**
* Retrieves the most recently translated-into target languages.
*
* This will return a cached value unless #invalidateMostRecentTargetLanguages
* has been called.
*
* @see {#invalidateMostRecentTargetLanguages}
*
* @returns {string[]} - An ordered list of the most recent target languages.
*/
static #getMostRecentTargetLanguages() {
if (TranslationsParent.#mostRecentTargetLanguages) {
return TranslationsParent.#mostRecentTargetLanguages;
}
// Store the mostRecentTargetLanguage values in reverse order
// so that the most recently used language is first in the array.
TranslationsParent.#mostRecentTargetLanguages = [
...lazy.mostRecentTargetLanguages,
].reverse();
return TranslationsParent.#mostRecentTargetLanguages;
}
/**
* Retrieves the user's preferred languages from the settings based on:
*
* 1. Web requested languages
* 2. App languages
* 3. OS language
*
* This will return a cached value unless #invalidateUserSettingsLanguages
* has been called.
*
* @see {#invalidateUserSettingsLanguages}
*
* @returns {string[]} - An ordered list of the user's settings languages.
*/
static #getUserSettingsLanguages() {
if (TranslationsParent.#userSettingsLanguages) {
return TranslationsParent.#userSettingsLanguages;
}
// The system language could also be a good option for a language to offer the user.
const osPrefs = Cc["@mozilla.org/intl/ospreferences;1"].getService(
Ci.mozIOSPreferences
);
const systemLocales =
TranslationsParent.mockedSystemLocales ?? osPrefs.systemLocales;
// Combine the locales together.
const userSettingsLocales = new Set([
...TranslationsParent.getWebContentLanguages(),
...Services.locale.appLocalesAsBCP47,
...systemLocales,
]);
// Attempt to convert the locales to lang tags. Do not completely trust the
// values coming from preferences and the OS to have been validated as correct
// BCP 47 locale identifiers.
const userSettingsLangTags = new Set();
for (const locale of userSettingsLocales) {
try {
userSettingsLangTags.add(new Intl.Locale(locale).language);
} catch (_) {
// The locale was invalid, discard it.
}
}
// Convert the Set to an array to indicate that it is an ordered listing of languages.
TranslationsParent.#userSettingsLanguages = [...userSettingsLangTags];
return TranslationsParent.#userSettingsLanguages;
}
/**
* An ordered list of preferred languages based on:
*
* 1. Most recent target languages
* 2. Web requested languages
* 3. App languages
* 4. OS language
*
* @param {object} options
* @param {string[]} [options.excludeLangTags] - BCP-47 language tags to intentionally exclude.
*
* @returns {string[]}
*/
static getPreferredLanguages({ excludeLangTags } = {}) {
if (TranslationsParent.#preferredLanguages) {
return TranslationsParent.#preferredLanguages.filter(
langTag => !excludeLangTags?.includes(langTag)
);
}
if (!TranslationsParent.#observingLanguages) {
Services.obs.addObserver(
TranslationsParent.#invalidateUserSettingsLanguages,
"intl:app-locales-changed"
);
Services.obs.addObserver(() => {
TranslationsParent.#invalidateMostRecentTargetLanguages();
Services.obs.notifyObservers(
null,
"translations:maybe-update-user-lang-tag"
);
}, "translations:most-recent-target-language-changed");
Services.prefs.addObserver(
"intl.accept_languages",
TranslationsParent.#invalidateUserSettingsLanguages
);
TranslationsParent.#observingLanguages = true;
}
const preferredLanguages = new Set([
...TranslationsParent.#getMostRecentTargetLanguages(),
...TranslationsParent.#getUserSettingsLanguages(),
]);
// Convert the Set to an array to indicate that it is an ordered listing of languages.
TranslationsParent.#preferredLanguages = [...preferredLanguages];
return TranslationsParent.#preferredLanguages.filter(
langTag => !excludeLangTags?.includes(langTag)
);
}
/**
* Requests a new translations port.
*
* @param {string} fromLanguage - The BCP-47 from-language tag.
* @param {string} toLanguage - The BCP-47 to-language tag.
* @param {TranslationsParent} [translationsParent] - A TranslationsParent actor instance.
* NOTE: This value should be provided only if your port is associated with Full Page Translations.
* This will associate this translations port with the TranslationsParent actor instance, which will mean that changes
* in the translation state will affect the state of the Full-Page Translations UI, e.g. the URL-bar Translations button.
*
* @returns {Promise<MessagePort | undefined>} The port for communication with the translation engine, or undefined on failure.
*/
static async requestTranslationsPort(
fromLanguage,
toLanguage,
translationsParent
) {
let translationsEngineParent;
try {
translationsEngineParent =
await lazy.EngineProcess.getTranslationsEngineParent();
} catch (error) {
lazy.console.error("Failed to get the translation engine process", error);
return undefined;
}
// The MessageChannel will be used for communicating directly between the content
// process and the engine's process.
const { port1, port2 } = new MessageChannel();
translationsEngineParent.startTranslation(
fromLanguage,
toLanguage,
port1,
translationsParent
);
return port2;
}
async receiveMessage({ name, data }) {
switch (name) {
case "Translations:ReportLangTags": {
const { documentElementLang, href } = data;
const detectedLanguages = await this.getDetectedLanguages(
documentElementLang,
href
).catch(error => {
// Detecting the languages can fail if the page gets destroyed before it
// can be completed. This runs on every page that doesn't have a lang tag,
// so only report the error if you have Translations logging turned on to
// avoid console spam.
lazy.console.log("Failed to get the detected languages.", error);
});
if (!detectedLanguages) {
// The actor was already destroyed, and the detectedLanguages weren't reported
// in time.
return undefined;
}
this.languageState.detectedLanguages = detectedLanguages;
if (this.shouldAutoTranslate(detectedLanguages)) {
this.translate(
detectedLanguages.docLangTag,
detectedLanguages.userLangTag,
true // reportAsAutoTranslate
);
} else {
this.maybeOfferTranslations(detectedLanguages);
}
return undefined;
}
case "Translations:RequestPort": {
const { requestedTranslationPair } = this.languageState;
if (!requestedTranslationPair) {
lazy.console.error(
"A port was requested but no translation pair was previously requested"
);
return undefined;
}
if (this.#isDestroyed) {
// This actor was already destroyed.
return undefined;
}
if (!this.innerWindowId) {
throw new Error(
"The innerWindowId for the TranslationsParent was not available."
);
}
const { fromLanguage, toLanguage } = requestedTranslationPair;
const port = await TranslationsParent.requestTranslationsPort(
fromLanguage,
toLanguage,
this
);
if (!port) {
lazy.console.error(
`Failed to create a translations port for language pair: (${fromLanguage} -> ${toLanguage})`
);
return undefined;
}
this.sendAsyncMessage(
"Translations:AcquirePort",
{ port },
[port] // Mark the port as transferable.
);
return undefined;
}
case "Translations:ReportFirstVisibleChange": {
this.languageState.hasVisibleChange = true;
}
}
return undefined;
}
/**
* @param {string} fromLanguage
* @param {string} toLanguage
*/
static async getTranslationsEnginePayload(fromLanguage, toLanguage) {
const wasmStartTime = Cu.now();
const bergamotWasmArrayBufferPromise =
TranslationsParent.#getBergamotWasmArrayBuffer();
bergamotWasmArrayBufferPromise
.then(() => {
ChromeUtils.addProfilerMarker(
"TranslationsParent",
{ innerWindowId: this.innerWindowId, startTime: wasmStartTime },
"Loading bergamot wasm array buffer"
);
})
.catch(() => {
// Do nothing.
});
const modelStartTime = Cu.now();
let files = await TranslationsParent.getLanguageTranslationModelFiles(
fromLanguage,
toLanguage
);
let languageModelFiles;
if (files) {
languageModelFiles = [files];
} else {
// No matching model was found, try to pivot between English.
const [files1, files2] = await Promise.all([
TranslationsParent.getLanguageTranslationModelFiles(
fromLanguage,
PIVOT_LANGUAGE
),
TranslationsParent.getLanguageTranslationModelFiles(
PIVOT_LANGUAGE,
toLanguage
),
]);
if (!files1 || !files2) {
throw new Error(
`No language models were found for ${fromLanguage} to ${toLanguage}`
);
}
languageModelFiles = [files1, files2];
}
ChromeUtils.addProfilerMarker(
"TranslationsParent",
{ innerWindowId: this.innerWindowId, startTime: modelStartTime },
"Loading translation model files"
);
const bergamotWasmArrayBuffer = await bergamotWasmArrayBufferPromise;
return {
bergamotWasmArrayBuffer,
languageModelFiles,
isMocked: TranslationsParent.#isTranslationsEngineMocked,
};
}
/**
* Returns true if translations should auto-translate from the given
* language, otherwise returns false.
*
* @param {LangTags} langTags
* @returns {boolean}
*/
#maybeAutoTranslate(langTags) {
const windowState = this.getWindowState();
if (windowState.isPageRestored) {
// The user clicked the restore button. Respect it for one page load.
windowState.isPageRestored = false;
// Skip this auto-translation.
return false;
}
return TranslationsParent.shouldAlwaysTranslateLanguage(langTags);
}
/**
* Creates a lookup key that is unique to each fromLanguage-toLanguage pair.
*
* @param {string} fromLanguage
* @param {string} toLanguage
* @returns {string}
*/
static languagePairKey(fromLanguage, toLanguage) {
return `${fromLanguage},${toLanguage}`;
}
/**
* The cached language pairs.
*
* @type {Promise<Array<LanguagePair>> | null}
*/
static #languagePairs = null;
/**
* Clears the cached list of language pairs, notifying observers that the
* available language pairs have changed.
*/
static #clearCachedLanguagePairs() {
TranslationsParent.#languagePairs = null;
Services.obs.notifyObservers(null, "translations:language-pairs-changed");
}
/**
* Get the list of translation pairs supported by the translations engine.
*
* @returns {Promise<Array<LanguagePair>>}
*/
static getLanguagePairs() {
if (!TranslationsParent.#languagePairs) {
TranslationsParent.#languagePairs =
TranslationsParent.#getTranslationModelRecords().then(records => {
const languagePairMap = new Map();
for (const { fromLang, toLang } of records.values()) {
const key = TranslationsParent.languagePairKey(fromLang, toLang);
if (!languagePairMap.has(key)) {
languagePairMap.set(key, { fromLang, toLang });
}
}
return Array.from(languagePairMap.values());
});
TranslationsParent.#languagePairs.catch(() => {
TranslationsParent.#clearCachedLanguagePairs();
});
}
return TranslationsParent.#languagePairs;
}
/**
* Get the list of languages and their display names, sorted by their display names.
* This is more expensive of a call than getLanguagePairs since the display names
* are looked up.
*
* This is all of the information needed to render dropdowns for translation
* language selection.
*
* @returns {Promise<SupportedLanguages>}
*/
static async getSupportedLanguages() {
await chaosMode(1 / 4);
const languagePairs = await TranslationsParent.getLanguagePairs();
/** @type {Set<string>} */
const fromLanguages = new Set();
/** @type {Set<string>} */
const toLanguages = new Set();
for (const { fromLang, toLang } of languagePairs) {
fromLanguages.add(fromLang);
toLanguages.add(toLang);
}
// Build a map of the langTag to the display name.
/** @type {Map<string, string>} */
const displayNames = new Map();
{
const dn = new Services.intl.DisplayNames(undefined, {
type: "language",
});
for (const langTagSet of [fromLanguages, toLanguages]) {
for (const langTag of langTagSet.keys()) {
if (displayNames.has(langTag)) {
continue;
}
displayNames.set(langTag, dn.of(langTag));
}
}
}
const addDisplayName = langTag => ({
langTag,
displayName: displayNames.get(langTag),
});
const sort = (a, b) => a.displayName.localeCompare(b.displayName);
return {
languagePairs,
fromLanguages: Array.from(fromLanguages.keys())
.map(addDisplayName)
.sort(sort),
toLanguages: Array.from(toLanguages.keys())
.map(addDisplayName)
.sort(sort),
};
}
/**
* Create a unique list of languages, sorted by the display name.
*
* @param {object} supportedLanguages
* @returns {Array<{ langTag: string, displayName: string}>}
*/
static getLanguageList(supportedLanguages) {
const displayNames = new Map();
for (const languages of [
supportedLanguages.fromLanguages,
supportedLanguages.toLanguages,
]) {
for (const { langTag, displayName } of languages) {
displayNames.set(langTag, displayName);
}
}
let appLangTag = new Intl.Locale(Services.locale.appLocaleAsBCP47).language;
// Don't offer to download the app's language.
displayNames.delete(appLangTag);
// Sort the list of languages by the display names.
return [...displayNames.entries()]
.map(([langTag, displayName]) => ({
langTag,
displayName,
}))
.sort((a, b) => a.displayName.localeCompare(b.displayName));
}
/**
* Get the display name for the given language Tag.
*
* @param {string} langTag
* @returns {string}
*/
static getLanguageDisplayName(langTag) {
// Services.intl.getLanguageDisplayNames takes a list of language codes and
// returns a list of correspoding display names. Hence the langTag is sent as a list
let displayName = Services.intl.getLanguageDisplayNames(undefined, [
langTag,
]);
return displayName[0];
}
/**
* Handles records that were deleted in a Remote Settings "sync" event by
* attempting to delete any previously downloaded attachments that are
* associated with the deleted records.
*
* @param {RemoteSettingsClient} client
* - The Remote Settings client for which to handle deleted records.
* @param {TranslationModelRecord[]} deletedRecords
* - The list of records that were deleted from the client's database.
*/
static async #handleDeletedRecords(client, deletedRecords) {
// Attempt to delete any downloaded attachments that are associated with deleted records.
const failedDeletions = [];
await Promise.all(
deletedRecords.map(async record => {
try {
if (await client.attachments.isDownloaded(record)) {
await client.attachments.deleteDownloaded(record);
}
} catch (error) {
failedDeletions.push({ record, error });
}
})
);
// Report deletion failures if any occurred.
if (failedDeletions.length) {
lazy.console.warn(
'Remote Settings "sync" event failed to delete attachments for deleted records.'
);
for (const { record, error } of failedDeletions) {
lazy.console.error(
`Failed to delete attachment for deleted record ${record.name}: ${error}`
);
}
}
}
/**
* Handles records that were updated in a Remote Settings "sync" event by
* attempting to delete any previously downloaded attachments that are
* associated with the old record versions, then downloading attachments
* that are associated with the new record versions.
*
* @param {RemoteSettingsClient} client
* - The Remote Settings client for which to handle updated records.
* @param {{old: TranslationModelRecord, new: TranslationModelRecord}[]} updatedRecords
* - The list of records that were updated in the client's database.
*/
static async #handleUpdatedRecords(client, updatedRecords) {
// Gather any updated records whose attachments were previously downloaded.
const recordsWithAttachmentsToReplace = [];
for (const {
old: recordBeforeUpdate,
new: recordAfterUpdate,
} of updatedRecords) {
if (await client.attachments.isDownloaded(recordBeforeUpdate)) {
recordsWithAttachmentsToReplace.push({
recordBeforeUpdate,
recordAfterUpdate,
});
}
}
// Attempt to delete all of the attachments for the old versions of the updated records.
const failedDeletions = [];
await Promise.all(
recordsWithAttachmentsToReplace.map(async ({ recordBeforeUpdate }) => {
try {
await client.attachments.deleteDownloaded(recordBeforeUpdate);
} catch (error) {
failedDeletions.push({ record: recordBeforeUpdate, error });
}
})
);
// Report deletion failures if any occurred.
if (failedDeletions.length) {
lazy.console.warn(
'Remote Settings "sync" event failed to delete old record attachments for updated records.'
);
for (const { record, error } of failedDeletions) {
lazy.console.error(
`Failed to delete old attachment for updated record ${record.name}: ${error.reason}`
);
}
}
// Attempt to download all of the attachments for the new versions of the updated records.
const failedDownloads = [];
await Promise.all(
recordsWithAttachmentsToReplace.map(async ({ recordAfterUpdate }) => {
try {
await client.attachments.download(recordAfterUpdate);
} catch (error) {
failedDownloads.push({ record: recordAfterUpdate, error });
}
})
);
// Report deletion failures if any occurred.
if (failedDownloads.length) {
lazy.console.warn(
'Remote Settings "sync" event failed to download new record attachments for updated records.'
);
for (const { record, error } of failedDeletions) {
lazy.console.error(
`Failed to download new attachment for updated record ${record.name}: ${error.reason}`
);
}
}
}
/**
* Handles the "sync" event for the Translations Models Remote Settings collection.
* This is called whenever models are created, updated, or deleted from the Remote Settings database.
*
* @param {object} event - The sync event.
* @param {object} event.data - The data associated with the sync event.
* @param {TranslationModelRecord[]} event.data.created
* - The list of Remote Settings records that were created in the sync event.
* @param {{old: TranslationModelRecord, new: TranslationModelRecord}[]} event.data.updated
* - The list of Remote Settings records that were updated in the sync event.
* @param {TranslationModelRecord[]} event.data.deleted
* - The list of Remote Settings records that were deleted in the sync event.
*/
static async #handleTranslationsModelsSync({
data: { created, updated, deleted },
}) {
const client = TranslationsParent.#translationModelsRemoteClient;
if (!client) {
lazy.console.error(
"Translations models client was not present when receiving a sync event."
);
return;
}
// Invalidate cached data.
TranslationsParent.#clearCachedLanguagePairs();
TranslationsParent.#translationModelRecords = null;
// Language model attachments will only be downloaded when they are used.
lazy.console.log(
`Remote Settings "sync" event for language-model records`,
{
created,
updated,
deleted,
}
);
if (deleted.length) {
await TranslationsParent.#handleDeletedRecords(client, deleted);
}
if (updated.length) {
await TranslationsParent.#handleUpdatedRecords(client, updated);
}
// There is nothing to do for created records, since they will not have any previously downloaded attachments.
}
/**
* Handles the "sync" event for the Translations WASM Remote Settings collection.
* This is called whenever models are created, updated, or deleted from the Remote Settings database.
*
* @param {object} event - The sync event.
* @param {object} event.data - The data associated with the sync event.
* @param {TranslationModelRecord[]} event.data.created
* - The list of Remote Settings records that were created in the sync event.
* @param {{old: TranslationModelRecord, new: TranslationModelRecord}[]} event.data.updated
* - The list of Remote Settings records that were updated in the sync event.
* @param {TranslationModelRecord[]} event.data.deleted
* - The list of Remote Settings records that were deleted in the sync event.
*/
static async #handleTranslationsWasmSync({
data: { created, updated, deleted },
}) {
const client = TranslationsParent.#translationsWasmRemoteClient;
if (!client) {
lazy.console.error(
"Translations WASM client was not present when receiving a sync event."
);
return;
}
lazy.console.log(`Remote Settings "sync" event for WASM records`, {
created,
updated,
deleted,
});
// Invalidate cached data.
TranslationsParent.#bergamotWasmRecord = null;
if (deleted.length) {
await TranslationsParent.#handleDeletedRecords(client, deleted);
}
if (updated.length) {
await TranslationsParent.#handleUpdatedRecords(client, updated);
}
// There is nothing to do for created records, since they will not have any previously downloaded attachments.
}
/**
* Lazily initializes the RemoteSettingsClient for the language models.
*
* @returns {RemoteSettingsClient}
*/
static #getTranslationModelsRemoteClient() {
if (TranslationsParent.#translationModelsRemoteClient) {
return TranslationsParent.#translationModelsRemoteClient;
}
/** @type {RemoteSettingsClient} */
const client = lazy.RemoteSettings("translations-models");
TranslationsParent.#translationModelsRemoteClient = client;
client.on("sync", TranslationsParent.#handleTranslationsModelsSync);
return client;
}
/**
* Retrieves the maximum major version of each record in the RemoteSettingsClient.
*
* If the client contains two different-version copies of the same record (e.g. 1.0 and 1.1)
* then only the 1.1-version record will be returned in the resulting collection.
*
* @param {RemoteSettingsClient} remoteSettingsClient
* @param {object} [options]
* @param {object} [options.filters={}]
* The filters to apply when retrieving the records from RemoteSettings.
* Filters should correspond to properties on the RemoteSettings records themselves.
* For example, A filter to retrieve only records with a `fromLang` value of "en" and a `toLang` value of "es":
* { filters: { fromLang: "en", toLang: "es" } }
* @param {number} options.majorVersion
* @param {Function} [options.lookupKey=(record => record.name)]
* The function to use to extract a lookup key from each record.
* This function should take a record as input and return a string that represents the lookup key for the record.
* For most record types, the name (default) is sufficient, however if a collection contains records with
* non-unique name values, it may be necessary to provide an alternative function here.
* @returns {Array<TranslationModelRecord | WasmRecord>}
*/
static async getMaxVersionRecords(
remoteSettingsClient,
{ filters = {}, majorVersion, lookupKey = record => record.name } = {}
) {
if (!majorVersion) {
throw new Error("Expected the records to have a major version.");
}
try {
await chaosMode(1 / 4);
} catch (_error) {
// Simulate an error by providing empty records.
return [];
}
const retrievedRecords = await remoteSettingsClient.get({
// Pull the records from the network if empty.
syncIfEmpty: true,
// Do not load the JSON dump if it is newer.
//
// The JSON dump comes from the Prod RemoteSettings channel
// so we shouldn't ever have an issue with the Prod server
// being older than the JSON dump itself (this is good).
//
// However, setting this to true will prevent us from
// testing RemoteSettings on the Dev and Stage
// environments if they happen to be older than the
// most recent JSON dump from Prod.
loadDumpIfNewer: false,
// Don't verify the signature if the client is mocked.
verifySignature: VERIFY_SIGNATURES_FROM_FS,
// Apply any filters for retrieving the records.
filters,
});
// Create a mapping to only the max version of each record discriminated by
// the result of the lookupKey() function.
const keyToRecord = new Map();
for (const record of retrievedRecords) {
const key = lookupKey(record);
const existing = keyToRecord.get(key);
if (!record.version) {
lazy.console.error(record);
throw new Error("Expected the record to have a version.");
}
if (
TranslationsParent.isBetterRecordVersion(
majorVersion,
record.version,
existing?.version
)
) {
keyToRecord.set(key, record);
}
}
return Array.from(keyToRecord.values());
}
/**
* Applies the constraint of matching for the best matching major version.
*
* @param {number} majorVersion
* @param {string} nextVersion
* @param {string} [existingVersion]
*/
static isBetterRecordVersion(majorVersion, nextVersion, existingVersion) {
return (
// Check that this is a major version record we can support.
Services.vc.compare(`${majorVersion}.0a`, nextVersion) <= 0 &&
Services.vc.compare(`${majorVersion + 1}.0a`, nextVersion) > 0 &&
// Check that the new record is bigger version number
(!existingVersion ||
Services.vc.compare(existingVersion, nextVersion) < 0)
);
}
/**
* Lazily initializes the model records, and returns the cached ones if they
* were already retrieved. The key of the returned `Map` is the record id.
*
* @returns {Promise<Map<string, TranslationModelRecord>>}
*/
static async #getTranslationModelRecords() {
if (!TranslationsParent.#translationModelRecords) {
// Place the records into a promise to prevent any races.
TranslationsParent.#translationModelRecords = (async () => {
const records = new Map();
const now = Date.now();
const client = TranslationsParent.#getTranslationModelsRemoteClient();
// Load the models. If no data is present, then there will be an initial sync.
// Rely on Remote Settings for the syncing strategy for receiving updates.
lazy.console.log(`Getting remote language models.`);
/** @type {TranslationModelRecord[]} */
const translationModelRecords =
await TranslationsParent.getMaxVersionRecords(client, {
majorVersion: TranslationsParent.LANGUAGE_MODEL_MAJOR_VERSION,
// Names in this collection are not unique, so we are appending the languagePairKey
// to guarantee uniqueness.
lookupKey: record =>
`${record.name}${TranslationsParent.languagePairKey(
record.fromLang,
record.toLang
)}`,
});
if (translationModelRecords.length === 0) {
throw new Error("Unable to retrieve the translation models.");
}
for (const record of TranslationsParent.ensureLanguagePairsHavePivots(
translationModelRecords
)) {
records.set(record.id, record);
}
const duration = (Date.now() - now) / 1000;
lazy.console.log(
`Remote language models loaded in ${duration} seconds.`,
records
);
return records;
})();
TranslationsParent.#translationModelRecords.catch(() => {
TranslationsParent.#translationModelRecords = null;
});
}
return TranslationsParent.#translationModelRecords;
}
/**
* This implementation assumes that every language pair has access to the
* pivot language. If any languages are added without a pivot language, or the
* pivot language is changed, then this implementation will need a more complicated
* language solver. This means that any UI pickers would need to be updated, and
* the pivot language selection would need a solver.
*
* @param {TranslationModelRecord[] | LanguagePair[]} records
*/
static ensureLanguagePairsHavePivots(records) {
if (!AppConstants.DEBUG) {
// Only run this check on debug builds as it's in the performance critical first
// page load path.
return records;
}
// lang -> pivot
const hasToPivot = new Set();
// pivot -> en
const hasFromPivot = new Set();
const fromLangs = new Set();
const toLangs = new Set();
for (const { fromLang, toLang } of records) {
fromLangs.add(fromLang);
toLangs.add(toLang);
if (toLang === PIVOT_LANGUAGE) {
// lang -> pivot
hasToPivot.add(fromLang);
}
if (fromLang === PIVOT_LANGUAGE) {
// pivot -> en
hasFromPivot.add(toLang);
}
}
const fromLangsToRemove = new Set();
const toLangsToRemove = new Set();
for (const lang of fromLangs) {
if (lang === PIVOT_LANGUAGE) {
continue;
}
// Check for "lang -> pivot"
if (!hasToPivot.has(lang)) {
TranslationsParent.reportError(
new Error(
`The "from" language model "${lang}" is being discarded as it doesn't have a pivot language.`
)
);
fromLangsToRemove.add(lang);
}
}
for (const lang of toLangs) {
if (lang === PIVOT_LANGUAGE) {
continue;
}
// Check for "pivot -> lang"
if (!hasFromPivot.has(lang)) {
TranslationsParent.reportError(
new Error(
`The "to" language model "${lang}" is being discarded as it doesn't have a pivot language.`
)
);
toLangsToRemove.add(lang);
}
}
const after = records.filter(record => {
if (fromLangsToRemove.has(record.fromLang)) {
return false;
}
if (toLangsToRemove.has(record.toLang)) {
return false;
}
return true;
});
return after;
}
/**
* Lazily initializes the RemoteSettingsClient for the downloaded wasm binary data.
*
* @returns {RemoteSettingsClient}
*/
static #getTranslationsWasmRemoteClient() {
if (TranslationsParent.#translationsWasmRemoteClient) {
return TranslationsParent.#translationsWasmRemoteClient;
}
/** @type {RemoteSettingsClient} */
const client = lazy.RemoteSettings("translations-wasm");
TranslationsParent.#translationsWasmRemoteClient = client;
client.on("sync", TranslationsParent.#handleTranslationsWasmSync);
return client;
}
/** @type {Promise<WasmRecord> | null} */
static #bergamotWasmRecord = null;
/** @type {boolean} */
static #lookForLocalWasmBuild = true;
/**
* This is used to load a local copy of the Bergamot translations engine, if it exists.
* From a local build of Firefox:
*
* 1. Run the python script:
* ./toolkit/components/translations/bergamot-translator/build-bergamot.py --debug
*
* 2. Uncomment the .wasm file in: toolkit/components/translations/jar.mn
* 3. Run: ./mach build
* 4. Run: ./mach run
*/
static async #maybeFetchLocalBergamotWasmArrayBuffer() {
if (TranslationsParent.#lookForLocalWasmBuild) {
// Attempt to get a local copy of the translator. Most likely this will be a 404.
try {
const response = await fetch(
);
const arrayBuffer = response.arrayBuffer();
lazy.console.log(`Using a local copy of Bergamot.`);
return arrayBuffer;
} catch {
// Only attempt to fetch once, if it fails don't try again.
TranslationsParent.#lookForLocalWasmBuild = false;
}
}
return null;
}
/**
* Bergamot is the translation engine that has been compiled to wasm. It is shipped
* to the user via Remote Settings.
*
*/
/**
* @returns {Promise<ArrayBuffer>}
*/
static async #getBergamotWasmArrayBuffer() {
const start = Date.now();
const client = TranslationsParent.#getTranslationsWasmRemoteClient();
const localCopy =
await TranslationsParent.#maybeFetchLocalBergamotWasmArrayBuffer();
if (localCopy) {
return localCopy;
}
if (!TranslationsParent.#bergamotWasmRecord) {
// Place the records into a promise to prevent any races.
TranslationsParent.#bergamotWasmRecord = (async () => {
// Load the wasm binary from remote settings, if it hasn't been already.
lazy.console.log(`Getting remote bergamot-translator wasm records.`);
/** @type {WasmRecord[]} */
const wasmRecords = await TranslationsParent.getMaxVersionRecords(
client,
{
filters: { name: "bergamot-translator" },
majorVersion: TranslationsParent.BERGAMOT_MAJOR_VERSION,
}
);
if (wasmRecords.length === 0) {
// The remote settings client provides an empty list of records when there is
// an error.
throw new Error(
"Unable to get the bergamot translator from Remote Settings."
);
}
if (wasmRecords.length > 1) {
TranslationsParent.reportError(
new Error(
"Expected the bergamot-translator to only have 1 record."
),
wasmRecords
);
}
const [record] = wasmRecords;
lazy.console.log(
`Using ${record.name}@${record.release} release version ${record.version} first released on Fx${record.fx_release}`,
record
);
return record;
})();
}
// Unlike the models, greedily download the wasm. It will pull it from a locale
// cache on disk if it's already been downloaded. Do not retain a copy, as
// this will be running in the parent process. It's not worth holding onto
// this much memory, so reload it every time it is needed.
try {
await chaosModeError(1 / 3);
/** @type {{buffer: ArrayBuffer}} */
const { buffer } = await client.attachments.download(
await TranslationsParent.#bergamotWasmRecord
);
const duration = Date.now() - start;
lazy.console.log(
`"bergamot-translator" wasm binary loaded in ${duration / 1000} seconds`
);
return buffer;
} catch (error) {
TranslationsParent.#bergamotWasmRecord = null;
throw error;
}
}
/**
* Deletes language files that match a language.
* Note, this call doesn't have directionality because it is checking and deleting files
* for both sides of the pair that are not involved in a pivot.
*
* @param {string} languageA The BCP 47 language tag.
* @param {string} languageB The BCP 47 language tag.
* @param {boolean} deletePivots When true, the request may delete files that could be used for another language's pivot to complete a translation.
* When false, the request will not delete files that could be used in another language's pivot.
*/
static async deleteLanguageFilesToAndFromPair(
languageA,
languageB,
deletePivots
) {
const client = TranslationsParent.#getTranslationModelsRemoteClient();
return Promise.all(
Array.from(
await TranslationsParent.getRecordsForTranslatingToAndFromPair(
languageA,
languageB,
deletePivots
)
).map(record => {
lazy.console.log("Deleting record", record);
return client.attachments.deleteDownloaded(record);
})
);
}
/**
* Deletes language files that match a language.
* This function operates based on the current app language.
*
* @param {string} language The BCP 47 language tag.
*/
static async deleteLanguageFiles(language) {
const appLanguage = new Intl.Locale(Services.locale.appLocaleAsBCP47)
.language;
return TranslationsParent.deleteLanguageFilesToAndFromPair(
language,
appLanguage,
/* deletePivots */ false
);
}
/**
* Download language files that match a language.
*
* @param {string} language The BCP 47 language tag.
*/
static async downloadLanguageFiles(language) {
const client = TranslationsParent.#getTranslationModelsRemoteClient();
const queue = [];
for (const record of await TranslationsParent.getRecordsForTranslatingToAndFromAppLanguage(
language,
/* includePivotRecords */ true
)) {
const download = () => {
lazy.console.log("Downloading record", record.name, record.id);
return client.attachments.download(record);
};
queue.push({ download });
}
return downloadManager(queue);
}
/**
* Download all files used for translations.
*/
static async downloadAllFiles() {
const client = TranslationsParent.#getTranslationModelsRemoteClient();
const queue = [];
for (const record of (
await TranslationsParent.#getTranslationModelRecords()
).values()) {
queue.push({
// The download may be attempted multiple times.
onFailure: () => {
console.error("Failed to download", record.name);
},
download: () => client.attachments.download(record),
});
}
queue.push({
download: () => TranslationsParent.#getBergamotWasmArrayBuffer(),
});
return downloadManager(queue);
}
/**
* Delete all language model files.
*
* @returns {Promise<string[]>} A list of record IDs.
*/
static async deleteAllLanguageFiles() {
const client = TranslationsParent.#getTranslationModelsRemoteClient();
await chaosMode();
await client.attachments.deleteAll();
return [...(await TranslationsParent.#getTranslationModelRecords()).keys()];
}
/**
* Delete all language model files not a part of a complete language package. Also known as
* the language model "cache" in the UI.
*
* Usage is to clean up language models that may be lingering in the file system and are not
* a part of a downloaded language model package.
*
* For example, this deletes models that were acquired via a translation on-the-fly, not
* the complete package of language models for a language that has both directions.
*
* A complete language package for this function is considered both directions, when available,
* for example, en->es (downloaded) and es->en (downloaded) is complete and nothing will be deleted.
*
* When the language is not symmetric, for example nn->en (downloaded), then this is also considered a
* complete package and not subject to deletion. (Note, in this example, en->nn is not available.)
*
* This will delete a downloaded model set when it is incomplete, for example en->es (downloaded) and es->en
* (not-downloaded) will delete en->es to clear the lingering one-sided package.
*
* @returns {Set<string>} Directional language pairs in the form of "fromLang,toLang" that indicates translation pairs that were deleted.
*/
static async deleteCachedLanguageFiles() {
const languagePairs = await TranslationsParent.getLanguagePairs();
const deletionRequest = [];
let deletedPairs = new Set();
for (const { fromLang, toLang } of languagePairs) {
const { downloadedPairs, nonDownloadedPairs } =
await TranslationsParent.getDownloadedFileStatusToAndFromPair(
fromLang,
toLang
);
if (downloadedPairs.size && nonDownloadedPairs.size) {
// It is possible that additional pairs are listed, but in general,
// this should be parallel with deletion requests.
downloadedPairs.forEach(langPair => deletedPairs.add(langPair));
deletionRequest.push(
TranslationsParent.deleteLanguageFilesToAndFromPair(
fromLang,
toLang,
/* deletePivots */ false
)
);
}
}
await Promise.all(deletionRequest);
return deletedPairs;
}
/**
* Contains information about what files are downloaded between a language pair.
* Note, this call doesn't have directionality because it is checking both sides of the pair.
*
* @param {string} languageA The BCP 47 language tag.
* @param {string} languageB The BCP 47 language tag.
*
* @returns {object} status The status between the pairs.
* @returns {Set<string>} status.downloadedPairs A set of strings that has directionality about what side
* is downloaded, in the format "fromLang,toLang".
* @returns {Set<string>} status.nonDownloadedPairs A set of strings that has directionality about what side
* is not downloaded, in the format "fromLang,toLang". It is possible to have files both in nonDownloadedFiles
* and downloadedFiles in the case of incomplete downloads.
*/
static async getDownloadedFileStatusToAndFromPair(languageA, languageB) {
const client = TranslationsParent.#getTranslationModelsRemoteClient();
let downloadedPairs = new Set();
let nonDownloadedPairs = new Set();
for (const record of await TranslationsParent.getRecordsForTranslatingToAndFromPair(
languageA,
languageB,
/* includePivotRecords */ true
)) {
let isDownloaded = false;
if (TranslationsParent.isInAutomation()) {
isDownloaded = record.attachment.isDownloaded;
} else {
isDownloaded = await client.attachments.isDownloaded(record);
}
if (isDownloaded) {
downloadedPairs.add(
TranslationsParent.languagePairKey(record.fromLang, record.toLang)
);
} else {
nonDownloadedPairs.add(
TranslationsParent.languagePairKey(record.fromLang, record.toLang)
);
}
}
return { downloadedPairs, nonDownloadedPairs };
}
/**
* Only returns true if all language files are present for a requested language.
* It's possible only half the files exist for a pivot translation into another
* language, or there was a download error, and we're still missing some files.
*
* @param {string} requestedLanguage The BCP 47 language tag.
*/
static async hasAllFilesForLanguage(requestedLanguage) {
const client = TranslationsParent.#getTranslationModelsRemoteClient();
for (const record of await TranslationsParent.getRecordsForTranslatingToAndFromAppLanguage(
requestedLanguage,
/* includePivotRecords */ true
)) {
if (!(await client.attachments.isDownloaded(record))) {
return false;
}
}
return true;
}
/**
* Get the necessary files for translating between two given languages.
* This may require the files for a pivot language translation
* if there is no language model for a direct translation.
* Note, this call doesn't have directionality because it is checking both sides of the pair.
*
* @param {string} languageA The BCP 47 language tag.
* @param {string} languageB The BCP 47 language tag.
* @param {boolean} includePivotRecords - When true, this will include a list of records with any required pivots.
* An example using true would be to determine which files to download to complete a translation.
* When false, this will not include the list of pivot records to achieve a translations.
* An example using false would be to determine which records to delete, but wanting to be
* cautions to avoid deleting model files used by another language.
* @returns {Set<TranslationModelRecord>}
*/
static async getRecordsForTranslatingToAndFromPair(
languageA,
languageB,
includePivotRecords
) {
const records = await TranslationsParent.#getTranslationModelRecords();
let matchedRecords = new Set();
if (languageA === languageB) {
// There are no records if the requested language and app language are the same.
return matchedRecords;
}
const addLanguagePair = (fromLang, toLang) => {
let matchFound = false;
for (const record of records.values()) {
if (record.fromLang === fromLang && record.toLang === toLang) {
matchedRecords.add(record);
matchFound = true;
}
}
return matchFound;
};
if (
// Is there a direct translation?
!addLanguagePair(languageA, languageB)
) {
// This is no direct translation, get the pivot files.
addLanguagePair(languageA, PIVOT_LANGUAGE);
// These files may be required for other pivot translations, so don't list
// them if we are deleting records.
if (includePivotRecords) {
addLanguagePair(PIVOT_LANGUAGE, languageB);
}
}
if (
// Is there a direct translation?
!addLanguagePair(languageB, languageA)
) {
// This is no direct translation, get the pivot files.
addLanguagePair(PIVOT_LANGUAGE, languageA);
// These files may be required for other pivot translations, so don't list
// them if we are deleting records.
if (includePivotRecords) {
addLanguagePair(languageB, PIVOT_LANGUAGE);
}
}
return matchedRecords;
}
/**
* Get the necessary files for translating to and from the app language and a
* requested language. This may require the files for a pivot language translation
* if there is no language model for a direct translation.
*
* @param {string} requestedLanguage The BCP 47 language tag.
* @param {boolean} includePivotRecords - When true, this will include a list of records with any required pivots.
* An example using true would be to determine which files to download to complete a translation.
* When false, this will not include the list of pivot records to achieve a translations.
* An example using false would be to determine which records to delete, but wanting to be
* cautions to avoid deleting model files used by another language.
* @returns {Set<TranslationModelRecord>}
*/
static async getRecordsForTranslatingToAndFromAppLanguage(
requestedLanguage,
includePivotRecords
) {
const appLanguage = new Intl.Locale(Services.locale.appLocaleAsBCP47)
.language;
return TranslationsParent.getRecordsForTranslatingToAndFromPair(
requestedLanguage,
appLanguage,
includePivotRecords
);
}
/**
* Gets the language model files in an array buffer by downloading attachments from
* Remote Settings, or retrieving them from the local cache. Each translation
* requires multiple files.
*
* Results are only returned if the model is found.
*
* @param {string} fromLanguage
* @param {string} toLanguage
* @param {boolean} withQualityEstimation
* @returns {null | LanguageTranslationModelFiles}
*/
static async getLanguageTranslationModelFiles(
fromLanguage,
toLanguage,
withQualityEstimation = false
) {
const client = TranslationsParent.#getTranslationModelsRemoteClient();
lazy.console.log(
`Beginning model downloads: "${fromLanguage}" to "${toLanguage}"`
);
const records = [
...(await TranslationsParent.#getTranslationModelRecords()).values(),
];
/** @type {LanguageTranslationModelFiles} */
let results;
// Use Promise.all to download (or retrieve from cache) the model files in parallel.
await Promise.all(
records.map(async record => {
if (record.fileType === "qualityModel" && !withQualityEstimation) {
// Do not include the quality models if they aren't needed.
return;
}
if (record.fromLang !== fromLanguage || record.toLang !== toLanguage) {
// Only use models that match.
return;
}
if (!results) {
results = {};
}
const start = Date.now();
// Download or retrieve from the local cache:
await chaosMode(1 / 3);
/** @type {{buffer: ArrayBuffer }} */
const { buffer } = await client.attachments.download(record);
results[record.fileType] = {
buffer,
record,
};
const duration = Date.now() - start;
lazy.console.log(
`Translation model fetched in ${duration / 1000} seconds:`,
record.fromLang,
record.toLang,
record.fileType,
record.version
);
})
);
if (!results) {
// No model files were found, pivoting will be required.
return null;
}
// Validate that all of the files we expected were actually available and
// downloaded.
if (!results.model) {
throw new Error(
`No model file was found for "${fromLanguage}" to "${toLanguage}."`
);
}
if (!results.lex) {
throw new Error(
`No lex file was found for "${fromLanguage}" to "${toLanguage}."`
);
}
if (withQualityEstimation && !results.qualityModel) {
throw new Error(
`No quality file was found for "${fromLanguage}" to "${toLanguage}."`
);
}
if (results.vocab) {
if (results.srcvocab) {
throw new Error(
`A srcvocab and vocab file were both included for "${fromLanguage}" to "${toLanguage}." Only one is needed.`
);
}
if (results.trgvocab) {
throw new Error(
`A trgvocab and vocab file were both included for "${fromLanguage}" to "${toLanguage}." Only one is needed.`
);
}
} else if (!results.srcvocab || !results.srcvocab) {
throw new Error(
`No vocab files were provided for "${fromLanguage}" to "${toLanguage}."`
);
}
return results;
}
static async getLanguageSize(language) {
const records = [
...(await TranslationsParent.#getTranslationModelRecords()).values(),
];
let downloadSize = 0;
await Promise.all(
records.map(async record => {
if (record.fromLang !== language && record.toLang !== language) {
return;
}
downloadSize += parseInt(record.attachment.size);
})
);
return downloadSize;
}
/**
* Gets the expected download size that will occur (if any) if translate is called on two given languages for display purposes.
*
* @param {string} fromLanguage
* @param {string} toLanguage
* @param {boolean} withQualityEstimation
* @returns {Promise<long>} Size in bytes of the expected download. A result of 0 indicates no download is expected for the request.
*/
static async getExpectedTranslationDownloadSize(
fromLanguage,
toLanguage,
withQualityEstimation = false
) {
const directSize = await this.#getModelDownloadSize(
fromLanguage,
toLanguage,
withQualityEstimation
);
// If a direct model is not found, then check pivots.
if (directSize.downloadSize == 0 && !directSize.modelFound) {
const indirectFrom = await TranslationsParent.#getModelDownloadSize(
fromLanguage,
PIVOT_LANGUAGE,
withQualityEstimation
);
const indirectTo = await TranslationsParent.#getModelDownloadSize(
PIVOT_LANGUAGE,
toLanguage,
withQualityEstimation
);
// Note, will also return 0 due to the models not being available as well.
return (
parseInt(indirectFrom.downloadSize) + parseInt(indirectTo.downloadSize)
);
}
return directSize.downloadSize;
}
/**
* Determines the language model download size for a specified translation for display purposes.
*
* @param {string} fromLanguage
* @param {string} toLanguage
* @param {boolean} withQualityEstimation
* @returns {Promise<{downloadSize: long, modelFound: boolean}>} Download size is the
* size in bytes of the estimated download for display purposes. Model found indicates
* a model was found. e.g., a result of {size: 0, modelFound: false} indicates no
* bytes to download, because a model wasn't located.
*/
static async #getModelDownloadSize(
fromLanguage,
toLanguage,
withQualityEstimation = false
) {
const client = TranslationsParent.#getTranslationModelsRemoteClient();
const records = [
...(await TranslationsParent.#getTranslationModelRecords()).values(),
];
let downloadSize = 0;
let modelFound = false;
await Promise.all(
records.map(async record => {
if (record.fileType === "qualityModel" && !withQualityEstimation) {
return;
}
if (record.fromLang !== fromLanguage || record.toLang !== toLanguage) {
return;
}
modelFound = true;
const isDownloaded = await client.attachments.isDownloaded(record);
if (!isDownloaded) {
downloadSize += parseInt(record.attachment.size);
}
})
);
return { downloadSize, modelFound };
}
/**
* Applies testing mocks to the TranslationsParent class.
*
* @param {object} options
* @param {boolean} [options.useMockedTranslator=true] - Whether to use a mocked translator.
* @param {RemoteSettingsClient} options.translationModelsRemoteClient - The remote client for translation models.
* @param {RemoteSettingsClient} options.translationsWasmRemoteClient - The remote client for translations WASM.
*/
static applyTestingMocks({
useMockedTranslator = true,
translationModelsRemoteClient,
translationsWasmRemoteClient,
}) {
lazy.console.log("Mocking RemoteSettings for the translations engine.");
TranslationsParent.#translationModelsRemoteClient =
translationModelsRemoteClient;
TranslationsParent.#translationsWasmRemoteClient =
translationsWasmRemoteClient;
TranslationsParent.#isTranslationsEngineMocked = useMockedTranslator;
translationModelsRemoteClient.on(
"sync",
TranslationsParent.#handleTranslationsModelsSync
);
translationsWasmRemoteClient.on(
"sync",
TranslationsParent.#handleTranslationsWasmSync
);
}
/**
* Most values are cached for performance, in tests we want to be able to clear them.
*/
static clearCache() {
// Records.
TranslationsParent.#bergamotWasmRecord = null;
TranslationsParent.#translationModelRecords = null;
// Clients.
TranslationsParent.#translationModelsRemoteClient = null;
TranslationsParent.#translationsWasmRemoteClient = null;
// Derived data.
TranslationsParent.#clearCachedLanguagePairs();
TranslationsParent.#mostRecentTargetLanguages = null;
TranslationsParent.#userSettingsLanguages = null;
TranslationsParent.#preferredLanguages = null;
TranslationsParent.#isTranslationsEngineSupported = null;
}
/**
* Remove the mocks for the translations engine, make sure and call clearCache after
* to remove the cached values.
*/
static removeTestingMocks() {
lazy.console.log(
"Removing RemoteSettings mock for the translations engine."
);
TranslationsParent.#translationModelsRemoteClient.off(
"sync",
TranslationsParent.#handleTranslationsModelsSync
);
TranslationsParent.#translationsWasmRemoteClient.off(
"sync",
TranslationsParent.#handleTranslationsWasmSync
);
TranslationsParent.#isTranslationsEngineMocked = false;
}
/**
* Report an error. Having this as a method allows tests to check that an error
* was properly reported.
*
* @param {Error} error - Providing an Error object makes sure the stack is properly
* reported.
* @param {any[]} args - Any args to pass on to console.error.
*/
static reportError(error, ...args) {
lazy.console.log(error, ...args);
}
/**
* @param {string} fromLanguage
* @param {string} toLanguage
* @param {boolean} reportAsAutoTranslate - In telemetry, report this as
* an auto-translate.
*/
async translate(fromLanguage, toLanguage, reportAsAutoTranslate) {
if (fromLanguage === toLanguage) {
lazy.console.error(
"A translation was requested where the from and to language match.",
{ fromLanguage, toLanguage, reportAsAutoTranslate }
);
return;
}
if (!fromLanguage || !toLanguage) {
lazy.console.error(
"A translation was requested but the fromLanguage or toLanguage was not set.",
{ fromLanguage, toLanguage, reportAsAutoTranslate }
);
return;
}
if (this.languageState.requestedTranslationPair) {
// This page has already been translated, restore it and translate it
// again once the actor has been recreated.
const windowState = this.getWindowState();
windowState.translateOnPageReload = { fromLanguage, toLanguage };
this.restorePage(fromLanguage);
} else {
const { docLangTag } = this.languageState.detectedLanguages;
if (!this.innerWindowId) {
throw new Error(
"The innerWindowId for the TranslationsParent was not available."
);
}
// The MessageChannel will be used for communicating directly between the content
// process and the engine's process.
const port = await TranslationsParent.requestTranslationsPort(
fromLanguage,
toLanguage,
this
);
if (!port) {
lazy.console.error(
`Failed to create a translations port for language pair: (${fromLanguage} -> ${toLanguage})`
);
return;
}
this.languageState.requestedTranslationPair = {
fromLanguage,
toLanguage,
};
const preferredLanguages = TranslationsParent.getPreferredLanguages();
const topPreferredLanguage =
preferredLanguages && preferredLanguages.length
? preferredLanguages[0]
: null;
TranslationsParent.telemetry().onTranslate({
docLangTag,
fromLanguage,
toLanguage,
topPreferredLanguage,
autoTranslate: reportAsAutoTranslate,
requestTarget: "full_page",
});
TranslationsParent.storeMostRecentTargetLanguage(toLanguage);
this.sendAsyncMessage(
"Translations:TranslatePage",
{
fromLanguage,
toLanguage,
port,
},
// Mark the MessageChannel port as transferable.
[port]
);
}
}
/**
* Restore the page to the original language by doing a hard reload.
*/
restorePage() {
TranslationsParent.telemetry().onRestorePage();
// Skip auto-translate for one page load.
const windowState = this.getWindowState();
windowState.isPageRestored = true;
this.languageState.hasVisibleChange = false;
this.languageState.requestedTranslationPair = null;
windowState.previousDetectedLanguages =
this.languageState.detectedLanguages;
const browser = this.browsingContext.embedderElement;
browser.reload();
}
static onLocationChange(browser) {
if (!lazy.translationsEnabledPref) {
// The pref isn't enabled, so don't attempt to get the actor.
return;
}
let actor;
try {
actor =
browser.browsingContext.currentWindowGlobal.getActor("Translations");
} catch {
// The actor may not be supported on this page, which throws an error.
}
actor?.languageState.locationChanged();
}
async queryIdentifyLanguage() {
if (
TranslationsParent.isInAutomation() &&
!TranslationsParent.#isTranslationsEngineMocked
) {
return null;
}
return this.sendQuery("Translations:IdentifyLanguage").catch(error => {
if (this.#isDestroyed) {
// The actor was destroyed while this message was still being resolved.
return null;
}
return Promise.reject(error);
});
}
/**
* Returns the language from the document element.
*
* @returns {Promise<string>}
*/
queryDocumentElementLang() {
return this.sendQuery("Translations:GetDocumentElementLang");
}
/**
* @param {LangTags} langTags
*/
shouldAutoTranslate(langTags) {
if (
langTags.docLangTag &&
langTags.userLangTag &&
langTags.isDocLangTagSupported &&
this.#maybeAutoTranslate(langTags) &&
!TranslationsParent.shouldNeverTranslateLanguage(langTags.docLangTag) &&
!this.shouldNeverTranslateSite()
) {
return true;
}
return false;
}
/**
* Checks if a given language tag is supported for translation
* when translating from this language into other languages.
*
* @param {string} langTag - A BCP-47 language tag.
* @returns {Promise<boolean>}
*/
static async isSupportedAsFromLang(langTag) {
if (!langTag) {
return false;
}
let languagePairs = await TranslationsParent.getLanguagePairs();
return Boolean(languagePairs.find(({ fromLang }) => fromLang === langTag));
}
/**
* Checks if a given language tag is supported for translation
* when translating from other languages into this language.
*
* @param {string} langTag - A BCP-47 language tag.
* @returns {Promise<boolean>}
*/
static async isSupportedAsToLang(langTag) {
if (!langTag) {
return false;
}
let languagePairs = await TranslationsParent.getLanguagePairs();
return Boolean(languagePairs.find(({ toLang }) => toLang === langTag));
}
/**
* Retrieves the top preferred user language for which translation
* is supported when translating to that language.
*
* @param {object} options
* @param {string[]} [options.excludeLangTags] - BCP-47 language tags to intentionally exclude.
*/
static async getTopPreferredSupportedToLang({ excludeLangTags } = {}) {
const preferredLanguages = TranslationsParent.getPreferredLanguages({
excludeLangTags,
});
for (const langTag of preferredLanguages) {
if (await TranslationsParent.isSupportedAsToLang(langTag)) {
return langTag;
}
}
return PIVOT_LANGUAGE;
}
/**
* Returns the lang tags that should be offered for translation. This is in the parent
* rather than the child to remove the per-content process memory allocation amount.
*
* @param {string} [documentElementLang]
* @param {string} [href]
* @returns {Promise<LangTags | null>} - Returns null if the actor was destroyed before
* the result could be resolved.
*/
async getDetectedLanguages(documentElementLang, href) {
if (this.languageState.detectedLanguages) {
return this.languageState.detectedLanguages;
}
const langTags = {
docLangTag: null,
userLangTag: null,
isDocLangTagSupported: false,
};
if (!TranslationsParent.getIsTranslationsEngineSupported()) {
return null;
}
if (documentElementLang === undefined) {
documentElementLang = await this.queryDocumentElementLang();
if (this.#isDestroyed) {
return null;
}
}
let languagePairs = await TranslationsParent.getLanguagePairs();
if (this.#isDestroyed) {
return null;
}
const determineIsDocLangTagSupported = () =>
Boolean(
languagePairs.find(({ fromLang }) => fromLang === langTags.docLangTag)
);
// First try to get the langTag from the document's markup.
try {
const docLocale = new Intl.Locale(documentElementLang);
langTags.docLangTag = docLocale.language;
langTags.isDocLangTagSupported = determineIsDocLangTagSupported();
} catch (error) {}
if (langTags.docLangTag) {
// If it's not supported, try it again with a canonicalized version.
if (!langTags.isDocLangTagSupported) {
langTags.docLangTag = Intl.getCanonicalLocales(langTags.docLangTag)[0];
langTags.isDocLangTagSupported = determineIsDocLangTagSupported();
}
// If it's still not supported, map macro language codes to specific ones.
if (!langTags.isDocLangTagSupported) {
// If more macro language codes are needed, this logic can be expanded.
if (langTags.docLangTag === "no") {
// Choose "Norwegian Bokmål" over "Norwegian Nynorsk" as it is more widely used.
//
//
// > A 2005 poll indicates that 86.3% use primarily Bokmål as their daily
// > written language, 5.5% use both Bokmål and Nynorsk, and 7.5% use
// > primarily Nynorsk.
langTags.docLangTag = "nb";
langTags.isDocLangTagSupported = determineIsDocLangTagSupported();
}
}
} else {
// If the document's markup had no specified langTag, attempt to identify the page's language.
langTags.docLangTag = await this.queryIdentifyLanguage();
if (this.#isDestroyed) {
return null;
}
langTags.isDocLangTagSupported = determineIsDocLangTagSupported();
}
if (!langTags.docLangTag) {
const message = "No valid language detected.";
ChromeUtils.addProfilerMarker(
"TranslationsParent",
{ innerWindowId: this.innerWindowId },
message
);
lazy.console.log(message, href);
const langTag = await TranslationsParent.getTopPreferredSupportedToLang();
if (this.#isDestroyed) {
return null;
}
if (langTag) {
langTags.userLangTag = langTag;
}
return langTags;
}
if (TranslationsParent.getWebContentLanguages().has(langTags.docLangTag)) {
// The doc language has been marked as a known language by the user, do not
// offer a translation.
const message =
"The app and document languages match, so not translating.";
ChromeUtils.addProfilerMarker(
"TranslationsParent",
{ innerWindowId: this.innerWindowId },
message
);
lazy.console.log(message, href);
// The docLangTag will be set, while the userLangTag will be null.
return langTags;
}
const langTag = await TranslationsParent.getTopPreferredSupportedToLang({
excludeLangTags: [langTags.docLangTag],
});
if (this.#isDestroyed) {
return null;
}
if (langTag) {
langTags.userLangTag = langTag;
}
if (!langTags.userLangTag) {
// No language pairs match.
const message = `No matching translation pairs were found for translating from "${langTags.docLangTag}".`;
ChromeUtils.addProfilerMarker(
"TranslationsParent",
{ innerWindowId: this.innerWindowId },
message
);
lazy.console.log(message, languagePairs);
}
return langTags;
}
/**
* The pref for if we can always offer a translation when it's available.
*/
static shouldAlwaysOfferTranslations() {
return lazy.automaticallyPopupPref;
}
/**
* Returns true if the given language tag is present in the always-translate
* languages preference, otherwise false.
*
* @param {LangTags} langTags
* @returns {boolean}
*/
static shouldAlwaysTranslateLanguage(langTags) {
const { docLangTag, userLangTag } = langTags;
if (docLangTag === userLangTag || !userLangTag) {
// Do not auto-translate when the docLangTag matches the userLangTag, or when
// the userLangTag is not set. The "always translate" is exposed via about:confg.
// In case of users putting in non-sensical things here, we don't want to break
// the experience. This behavior can lead to a "language degradation machine"
// where we go from a source language -> pivot language -> source language.
return false;
}
return lazy.alwaysTranslateLangTags.has(docLangTag);
}
/**
* Returns true if the given language tag is present in the never-translate
* languages preference, otherwise false.
*
* @param {string} langTag - A BCP-47 language tag
* @returns {boolean}
*/
static shouldNeverTranslateLanguage(langTag) {
return lazy.neverTranslateLangTags.has(langTag);
}
/**
* Returns true if the current site is denied permissions to translate,
* otherwise returns false.
*
* @returns {Promise<boolean>}
*/
shouldNeverTranslateSite() {
const perms = Services.perms;
const permission = perms.getPermissionObject(
this.browsingContext.currentWindowGlobal.documentPrincipal,
TRANSLATIONS_PERMISSION,
/* exactHost */ false
);
return permission?.capability === perms.DENY_ACTION;
}
/**
* Removes the given language tag from the given preference.
*
* @param {string} langTag - A BCP-47 language tag
* @param {string} prefName - The pref name
*/
static removeLangTagFromPref(langTag, prefName) {
const langTags =
prefName === ALWAYS_TRANSLATE_LANGS_PREF
? lazy.alwaysTranslateLangTags
: lazy.neverTranslateLangTags;
const newLangTags = [...langTags].filter(tag => tag !== langTag);
Services.prefs.setCharPref(prefName, [...newLangTags].join(","));
}
/**
* Adds the given language tag to the given preference.
*
* @param {string} langTag - A BCP-47 language tag
* @param {string} prefName - The pref name
*/
static addLangTagToPref(langTag, prefName) {
const langTags =
prefName === ALWAYS_TRANSLATE_LANGS_PREF
? lazy.alwaysTranslateLangTags
: lazy.neverTranslateLangTags;
if (!langTags.has(langTag)) {
langTags.add(langTag);
}
Services.prefs.setCharPref(prefName, [...langTags].join(","));
}
/**
* Stores the given langTag as the most recent target language in the
* browser.translations.mostRecentTargetLanguage pref.
*
* @param {string} langTag - A BCP-47 language tag.
*/
static storeMostRecentTargetLanguage(langTag) {
// The pref's language tags are managed by this function as a unique-item
// sliding window with a max size.
//
// Examples with MAX_SIZE = 3:
//
// Add a new item to an empty window:
// [ ] + a => [a]
//
// Add a new item to a non-full window:
// [a] + b => [a, b]
//
// [a, b] + c => [a, b, c]
//
// Add a new item to a full window:
// [a, b, c] + z => [b, c, z]
//
// Add an item that is already within a window:
// [b, c, z] + z => [b, c, z]
//
// [b, c, z] + c => [b, z, c]
//
// [b, z, c] + b => [z, c, b]
const MAX_SIZE = 3;
const mostRecentTargetLanguages = lazy.mostRecentTargetLanguages;
if (mostRecentTargetLanguages.has(langTag)) {
// The language tag is already present, so delete it to ensure that its order is updated when it gets re-added.
mostRecentTargetLanguages.delete(langTag);
} else if (mostRecentTargetLanguages.size === MAX_SIZE) {
// We only store MAX_SIZE lang tags, so remove the oldest language tag to make room for the new language tag.
const oldestLangTag = mostRecentTargetLanguages.keys().next().value;
mostRecentTargetLanguages.delete(oldestLangTag);
}
mostRecentTargetLanguages.add(langTag);
Services.prefs.setCharPref(
"browser.translations.mostRecentTargetLanguages",
[...mostRecentTargetLanguages].join(",")
);
}
/**
* Toggles the always-translate language preference by adding the language
* to the pref list if it is not present, or removing it if it is present.
*
* @param {LangTags} langTags
* @returns {boolean}
* True if always-translate was enabled for this language.
* False if always-translate was disabled for this language.
*/
static toggleAlwaysTranslateLanguagePref(langTags) {
const { docLangTag, appLangTag } = langTags;
if (appLangTag === docLangTag) {
// In case somehow the user attempts to toggle this when the app and doc language
// are the same, just remove the lang tag.
this.removeLangTagFromPref(appLangTag, ALWAYS_TRANSLATE_LANGS_PREF);
return false;
}
if (TranslationsParent.shouldAlwaysTranslateLanguage(langTags)) {
// The pref was toggled off for this langTag
this.removeLangTagFromPref(docLangTag, ALWAYS_TRANSLATE_LANGS_PREF);
return false;
}
// The pref was toggled on for this langTag
this.addLangTagToPref(docLangTag, ALWAYS_TRANSLATE_LANGS_PREF);
this.removeLangTagFromPref(docLangTag, NEVER_TRANSLATE_LANGS_PREF);
return true;
}
static getAlwaysTranslateLanguages() {
return lazy.alwaysTranslateLangTags;
}
static getNeverTranslateLanguages() {
return lazy.neverTranslateLangTags;
}
/**
* Toggle the automatically popup pref, which will either
* enable or disable translations being offered to the user.
*
* @returns {boolean}
* True if offering translations was enabled by this call.
* False if offering translations was disabled by this call.
*/
static toggleAutomaticallyPopupPref() {
const prefValueBeforeToggle = lazy.automaticallyPopupPref;
Services.prefs.setBoolPref(
"browser.translations.automaticallyPopup",
!prefValueBeforeToggle
);
return !prefValueBeforeToggle;
}
/**
* Toggles the never-translate language preference by adding the language
* to the pref list if it is not present, or removing it if it is present.
*
* @param {string} langTag - A BCP-47 language tag
* @returns {boolean} Whether the pref was toggled on or off for this langTag.
* True if never-translate was enabled for this language.
* False if never-translate was disabled for this language.
*/
static toggleNeverTranslateLanguagePref(langTag) {
if (TranslationsParent.shouldNeverTranslateLanguage(langTag)) {
// The pref was toggled off for this langTag
this.removeLangTagFromPref(langTag, NEVER_TRANSLATE_LANGS_PREF);
return false;
}
// The pref was toggled on for this langTag
this.addLangTagToPref(langTag, NEVER_TRANSLATE_LANGS_PREF);
this.removeLangTagFromPref(langTag, ALWAYS_TRANSLATE_LANGS_PREF);
return true;
}
/**
* Toggles the never-translate site permissions by adding DENY_ACTION to
* the site principal if it is not present, or removing it if it is present.
*
* @returns {boolean}
* True if never-translate was enabled for this site.
* False if never-translate was disabled for this site.
*/
toggleNeverTranslateSitePermissions() {
if (this.shouldNeverTranslateSite()) {
return this.setNeverTranslateSitePermissions(false);
}
return this.setNeverTranslateSitePermissions(true);
}
/**
* Sets the never-translate site permissions by adding DENY_ACTION to
* the site principal.
*
* @param {string} neverTranslate - The never translate setting.
* @returns {boolean}
* True if never-translate was enabled for this site.
* False if never-translate was disabled for this site.
*/
setNeverTranslateSitePermissions(neverTranslate) {
const { documentPrincipal } = this.browsingContext.currentWindowGlobal;
return TranslationsParent.#setNeverTranslateSiteByPrincipal(
neverTranslate,
documentPrincipal
);
}
/**
* Sets the never-translate site permissions by creating a principal from the URL origin
* and setting or unsetting the DENY_ACTION on the permission.
*
* @param {string} neverTranslate - The never translate setting to use.
* @param {string} urlOrigin - The url origin to set the permission for.
* @returns {boolean}
* True if never-translate was enabled for this origin.
* False if never-translate was disabled for this origin.
*/
static setNeverTranslateSiteByOrigin(neverTranslate, urlOrigin) {
const principal =
Services.scriptSecurityManager.createContentPrincipalFromOrigin(
urlOrigin
);
return TranslationsParent.#setNeverTranslateSiteByPrincipal(
neverTranslate,
principal
);
}
/**
* Sets the never-translate site permissions by adding DENY_ACTION to
* the specified site principal.
*
* @param {string} neverTranslate - The never translate setting.
* @param {string} principal - The principal that should have the permission attached.
* @returns {boolean}
* True if never-translate was enabled for this principal.
* False if never-translate was disabled for this principal.
*/
static #setNeverTranslateSiteByPrincipal(neverTranslate, principal) {
const perms = Services.perms;
if (!neverTranslate) {
perms.removeFromPrincipal(principal, TRANSLATIONS_PERMISSION);
return false;
}
perms.addFromPrincipal(
principal,
TRANSLATIONS_PERMISSION,
perms.DENY_ACTION
);
return true;
}
/**
* Creates a list of URLs that have a translations permission set on the resource.
* These are the sites to never translate.
*
* @returns {Array<string>} String array with the URL of the sites that have the never translate permission.
*/
static listNeverTranslateSites() {
const neverTranslateSites = [];
for (const perm of Services.perms.getAllByTypes([
TRANSLATIONS_PERMISSION,
])) {
if (perm.capability === Services.perms.DENY_ACTION) {
neverTranslateSites.push(perm.principal.origin);
}
}
let stripProtocol = s => s?.replace(/^\w+:/, "") || "";
return neverTranslateSites.sort((a, b) => {
return stripProtocol(a).localeCompare(stripProtocol(b));
});
}
/**
* Ensure that the translations are always destroyed, even if the content translations
* are misbehaving.
*/
#ensureTranslationsDiscarded() {
if (!lazy.EngineProcess.translationsEngineParent) {
return;
}
lazy.EngineProcess.translationsEngineParent
// If the engine fails to load, ignore it since we are ending translations.
.catch(() => null)
.then(actor => {
if (actor && this.languageState.requestedTranslationPair) {
actor.discardTranslations(this.innerWindowId);
}
})
// This error will be one from the endTranslation code, which we need to
// surface.
.catch(error => lazy.console.error(error));
}
didDestroy() {
if (!this.innerWindowId) {
throw new Error(
"The innerWindowId for the TranslationsParent was not available."
);
}
Services.obs.removeObserver(
this.maybeUpdateUserLangTag,
"translations:maybe-update-user-lang-tag"
);
this.#ensureTranslationsDiscarded();
this.#isDestroyed = true;
}
}
/**
* Validate some simple Wasm that uses a SIMD operation.
*/
function detectSimdSupport() {
try {
return WebAssembly.validate(
new Uint8Array(
// ```
// ;; Detect SIMD support.
// ;; Compile by running: wat2wasm --enable-all simd-detect.wat
//
// (module
// (func (result v128)
// i32.const 0
// i8x16.splat
// i8x16.popcnt
// )
// )
// ```
// prettier-ignore
[
0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, 0x01, 0x05, 0x01, 0x60, 0x00,
0x01, 0x7b, 0x03, 0x02, 0x01, 0x00, 0x0a, 0x0a, 0x01, 0x08, 0x00, 0x41, 0x00,
0xfd, 0x0f, 0xfd, 0x62, 0x0b
]
)
);
} catch {
return false;
}
}
/**
* State that affects the UI. Any of the state that gets set triggers a dispatch to update
* the UI.
*/
class TranslationsLanguageState {
/**
* @param {TranslationsParent} actor
* @param {LangTags | null} previousDetectedLanguages
*/
constructor(actor, previousDetectedLanguages = null) {
this.#actor = actor;
this.#detectedLanguages = previousDetectedLanguages;
}
/**
* The data members for TranslationsLanguageState, see the getters for their
* documentation.
*/
/** @type {TranslationsParent} */
#actor;
/** @type {TranslationPair | null} */
#requestedTranslationPair = null;
/** @type {LangTags | null} */
#detectedLanguages = null;
/** @type {boolean} */
#hasVisibleChange = false;
/** @type {null | TranslationErrors} */
#error = null;
#isEngineReady = false;
/**
* Dispatch anytime the language details change, so that any UI can react to it.
*/
dispatch({ reason } = {}) {
const browser = this.#actor.browsingContext.top.embedderElement;
if (!browser) {
return;
}
const { CustomEvent } = browser.ownerGlobal;
browser.dispatchEvent(
new CustomEvent("TranslationsParent:LanguageState", {
bubbles: true,
detail: {
actor: this.#actor,
reason,
},
})
);
}
/**
* When a translation is requested, this contains the translation pair. This means
* that the TranslationsChild should be creating a TranslationsDocument and keep
* the page updated with the target language.
*
* @returns {TranslationPair | null}
*/
get requestedTranslationPair() {
return this.#requestedTranslationPair;
}
set requestedTranslationPair(requestedTranslationPair) {
if (this.#requestedTranslationPair === requestedTranslationPair) {
return;
}
this.#error = null;
this.#isEngineReady = false;
this.#requestedTranslationPair = requestedTranslationPair;
this.dispatch({ reason: "requestedTranslationPair" });
}
/**
* The stored results for the detected languages.
*
* @returns {LangTags | null}
*/
get detectedLanguages() {
return this.#detectedLanguages;
}
set detectedLanguages(detectedLanguages) {
if (this.#detectedLanguages === detectedLanguages) {
return;
}
this.#detectedLanguages = detectedLanguages;
this.dispatch({ reason: "detectedLanguages" });
}
/**
* A visual translation change occurred on the DOM.
*
* @returns {boolean}
*/
get hasVisibleChange() {
return this.#hasVisibleChange;
}
set hasVisibleChange(hasVisibleChange) {
if (this.#hasVisibleChange === hasVisibleChange) {
return;
}
this.#hasVisibleChange = hasVisibleChange;
this.dispatch({ reason: "hasVisibleChange" });
}
/**
* When the location changes remove the previous error and dispatch a change event
* so that any browser chrome UI that needs to be updated can get the latest state.
*/
locationChanged() {
this.#error = null;
this.dispatch({ reason: "locationChanged" });
}
/**
* Makes a determination about whether to update the cached userLangTag with the given langTag.
*/
maybeUpdateUserLangTag(langTag) {
const currentUserLangTag = this.#detectedLanguages?.userLangTag;
if (!currentUserLangTag) {
// The userLangTag is not present in the detectedLanguages cache.
// This is intentional and we should not update it in this case,
// otherwise we may end up showing the Translations URL-bar button
// on a page where it is currently hidden.
return;
}
this.#detectedLanguages.userLangTag = langTag;
// There is no need to call this.dispatch() in this function.
//
// Updating the userLangTag will affect which language is offered the next time
// a panel is opened, or which language is auto-translated into when a page loads,
// but this information should not eagerly affect the visual states of Translations
// content across the browser. Relevant consumers will fetch the updated langTag from
// the cache when they need it.
//
// In theory, calling this.dispatch() should be fine to do since the LanguageState event
// guards itself against irrelevant changes, but that would ultimately cause unneeded noise.
}
/**
* The last error that occurred during translation.
*/
get error() {
return this.#error;
}
set error(error) {
if (this.#error === error) {
return;
}
this.#error = error;
// Setting an error invalidates the requested translation pair.
this.#requestedTranslationPair = null;
this.#isEngineReady = false;
this.dispatch({ reason: "error" });
}
/**
* Stores when the translations engine is ready. The wasm and language files must
* be downloaded, which can take some time.
*/
get isEngineReady() {
return this.#isEngineReady;
}
set isEngineReady(isEngineReady) {
if (this.#isEngineReady === isEngineReady) {
return;
}
this.#isEngineReady = isEngineReady;
this.dispatch({ reason: "isEngineReady" });
}
}
/**
* @typedef {object} QueueItem
* @property {Function} download
* @property {Function} [onSuccess]
* @property {Function} [onFailure]
* @property {number} [retriesLeft]
*/
/**
* Manage the download of the files by providing a maximum number of concurrent files
* and the ability to retry a file download in case of an error.
*
* @param {QueueItem[]} queue
*/
async function downloadManager(queue) {
const NOOP = () => {};
const pendingDownloadAttempts = new Set();
let failCount = 0;
let index = 0;
const start = Date.now();
const originalQueueLength = queue.length;
while (index < queue.length || pendingDownloadAttempts.size > 0) {
// Start new downloads up to the maximum limit
while (
index < queue.length &&
pendingDownloadAttempts.size < TranslationsParent.MAX_CONCURRENT_DOWNLOADS
) {
lazy.console.log(`Starting download ${index + 1} of ${queue.length}`);
const {
download,
onSuccess = NOOP,
onFailure = NOOP,
retriesLeft = TranslationsParent.MAX_DOWNLOAD_RETRIES,
} = queue[index];
const handleFailedDownload = error => {
// The download failed. Either retry it, or report the failure.
TranslationsParent.reportError(
new Error("Failed to download file."),
error
);
const newRetriesLeft = retriesLeft - 1;
if (retriesLeft > 0) {
lazy.console.log(
`Queueing another attempt. ${newRetriesLeft} attempts left.`
);
queue.push({
download,
retriesLeft: newRetriesLeft,
onSuccess,
onFailure,
});
} else {
// Give up on this download.
failCount++;
onFailure();
}
};
const afterDownloadAttempt = () => {
pendingDownloadAttempts.delete(downloadAttempt);
};
// Kick off the download. If it fails, retry it a certain number of attempts.
// This is done asynchronously from the rest of the for loop.
const downloadAttempt = download()
.then(onSuccess, handleFailedDownload)
.then(afterDownloadAttempt);
pendingDownloadAttempts.add(downloadAttempt);
index++;
}
// Wait for any active downloads to complete.
await Promise.race(pendingDownloadAttempts);
}
const duration = ((Date.now() - start) / 1000).toFixed(3);
if (failCount > 0) {
const message = `Finished downloads in ${duration} seconds, but ${failCount} download(s) failed.`;
lazy.console.log(
`Finished downloads in ${duration} seconds, but ${failCount} download(s) failed.`
);
throw new Error(message);
}
lazy.console.log(
`Finished ${originalQueueLength} downloads in ${duration} seconds.`
);
}
/**
* The translations code has lots of async code and fallible network requests. To test
* this manually while using the feature, enable chaos mode by setting "errors" to true
* and "timeoutMS" to a positive number of milliseconds.
* prefs to true:
*
* - browser.translations.chaos.timeoutMS
* - browser.translations.chaos.errors
*/
async function chaosMode(probability = 0.5) {
await chaosModeTimer();
await chaosModeError(probability);
}
/**
* The translations code has lots of async code that relies on the network. To test
* this manually while using the feature, enable chaos mode by setting the following pref
* to a positive number of milliseconds.
*
* - browser.translations.chaos.timeoutMS
*/
async function chaosModeTimer() {
if (lazy.chaosTimeoutMSPref) {
const timeout = Math.random() * lazy.chaosTimeoutMSPref;
lazy.console.log(
`Chaos mode timer started for ${(timeout / 1000).toFixed(1)} seconds.`
);
await new Promise(resolve => lazy.setTimeout(resolve, timeout));
}
}
/**
* The translations code has lots of async code that is fallible. To test this manually
* while using the feature, enable chaos mode by setting the following pref to true.
*
* - browser.translations.chaos.errors
*/
async function chaosModeError(probability = 0.5) {
if (lazy.chaosErrorsPref && Math.random() < probability) {
lazy.console.trace(`Chaos mode error generated.`);
throw new Error(
`Chaos Mode error from the pref "browser.translations.chaos.errors".`
);
}
}