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Update frontend build (#5258)
Co-authored-by: GitHub Action <action@github.com>
This commit is contained in:
Swifty
383
frontend/build/web/flutter.js
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383
frontend/build/web/flutter.js
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@@ -0,0 +1,383 @@
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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if (!_flutter) {
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var _flutter = {};
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}
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_flutter.loader = null;
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(function () {
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"use strict";
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const baseUri = ensureTrailingSlash(getBaseURI());
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function getBaseURI() {
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const base = document.querySelector("base");
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return (base && base.getAttribute("href")) || "";
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}
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function ensureTrailingSlash(uri) {
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if (uri == "") {
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return uri;
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}
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return uri.endsWith("/") ? uri : `${uri}/`;
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}
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/**
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* Wraps `promise` in a timeout of the given `duration` in ms.
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*
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* Resolves/rejects with whatever the original `promises` does, or rejects
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* if `promise` takes longer to complete than `duration`. In that case,
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* `debugName` is used to compose a legible error message.
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*
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* If `duration` is < 0, the original `promise` is returned unchanged.
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* @param {Promise} promise
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* @param {number} duration
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* @param {string} debugName
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* @returns {Promise} a wrapped promise.
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*/
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async function timeout(promise, duration, debugName) {
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if (duration < 0) {
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return promise;
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}
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let timeoutId;
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const _clock = new Promise((_, reject) => {
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timeoutId = setTimeout(() => {
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reject(
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new Error(
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`${debugName} took more than ${duration}ms to resolve. Moving on.`,
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{
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cause: timeout,
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}
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)
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);
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}, duration);
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});
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return Promise.race([promise, _clock]).finally(() => {
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clearTimeout(timeoutId);
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});
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}
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/**
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* Handles the creation of a TrustedTypes `policy` that validates URLs based
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* on an (optional) incoming array of RegExes.
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*/
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class FlutterTrustedTypesPolicy {
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/**
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* Constructs the policy.
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* @param {[RegExp]} validPatterns the patterns to test URLs
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* @param {String} policyName the policy name (optional)
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*/
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constructor(validPatterns, policyName = "flutter-js") {
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const patterns = validPatterns || [
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/\.js$/,
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];
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if (window.trustedTypes) {
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this.policy = trustedTypes.createPolicy(policyName, {
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createScriptURL: function(url) {
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const parsed = new URL(url, window.location);
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const file = parsed.pathname.split("/").pop();
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const matches = patterns.some((pattern) => pattern.test(file));
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if (matches) {
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return parsed.toString();
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}
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console.error(
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"URL rejected by TrustedTypes policy",
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policyName, ":", url, "(download prevented)");
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}
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});
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}
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}
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}
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/**
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* Handles loading/reloading Flutter's service worker, if configured.
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*
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* @see: https://developers.google.com/web/fundamentals/primers/service-workers
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*/
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class FlutterServiceWorkerLoader {
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/**
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* Injects a TrustedTypesPolicy (or undefined if the feature is not supported).
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* @param {TrustedTypesPolicy | undefined} policy
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*/
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setTrustedTypesPolicy(policy) {
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this._ttPolicy = policy;
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}
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/**
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* Returns a Promise that resolves when the latest Flutter service worker,
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* configured by `settings` has been loaded and activated.
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*
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* Otherwise, the promise is rejected with an error message.
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* @param {*} settings Service worker settings
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* @returns {Promise} that resolves when the latest serviceWorker is ready.
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*/
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loadServiceWorker(settings) {
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if (settings == null) {
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// In the future, settings = null -> uninstall service worker?
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console.debug("Null serviceWorker configuration. Skipping.");
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return Promise.resolve();
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}
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if (!("serviceWorker" in navigator)) {
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let errorMessage = "Service Worker API unavailable.";
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if (!window.isSecureContext) {
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errorMessage += "\nThe current context is NOT secure."
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errorMessage += "\nRead more: https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts";
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}
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return Promise.reject(
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new Error(errorMessage)
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);
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}
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const {
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serviceWorkerVersion,
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serviceWorkerUrl = `${baseUri}flutter_service_worker.js?v=${serviceWorkerVersion}`,
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timeoutMillis = 4000,
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} = settings;
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// Apply the TrustedTypes policy, if present.
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let url = serviceWorkerUrl;
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if (this._ttPolicy != null) {
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url = this._ttPolicy.createScriptURL(url);
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}
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const serviceWorkerActivation = navigator.serviceWorker
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.register(url)
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.then(this._getNewServiceWorker)
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.then(this._waitForServiceWorkerActivation);
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// Timeout race promise
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return timeout(
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serviceWorkerActivation,
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timeoutMillis,
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"prepareServiceWorker"
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);
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}
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/**
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* Returns the latest service worker for the given `serviceWorkerRegistrationPromise`.
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*
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* This might return the current service worker, if there's no new service worker
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* awaiting to be installed/updated.
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*
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* @param {Promise<ServiceWorkerRegistration>} serviceWorkerRegistrationPromise
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* @returns {Promise<ServiceWorker>}
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*/
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async _getNewServiceWorker(serviceWorkerRegistrationPromise) {
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const reg = await serviceWorkerRegistrationPromise;
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if (!reg.active && (reg.installing || reg.waiting)) {
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// No active web worker and we have installed or are installing
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// one for the first time. Simply wait for it to activate.
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console.debug("Installing/Activating first service worker.");
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return reg.installing || reg.waiting;
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} else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
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// When the app updates the serviceWorkerVersion changes, so we
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// need to ask the service worker to update.
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return reg.update().then((newReg) => {
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console.debug("Updating service worker.");
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return newReg.installing || newReg.waiting || newReg.active;
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});
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} else {
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console.debug("Loading from existing service worker.");
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return reg.active;
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}
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}
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/**
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* Returns a Promise that resolves when the `latestServiceWorker` changes its
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* state to "activated".
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*
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* @param {Promise<ServiceWorker>} latestServiceWorkerPromise
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* @returns {Promise<void>}
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*/
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async _waitForServiceWorkerActivation(latestServiceWorkerPromise) {
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const serviceWorker = await latestServiceWorkerPromise;
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if (!serviceWorker || serviceWorker.state == "activated") {
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if (!serviceWorker) {
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return Promise.reject(
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new Error("Cannot activate a null service worker!")
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);
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} else {
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console.debug("Service worker already active.");
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return Promise.resolve();
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}
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}
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return new Promise((resolve, _) => {
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serviceWorker.addEventListener("statechange", () => {
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if (serviceWorker.state == "activated") {
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console.debug("Activated new service worker.");
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resolve();
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}
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});
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});
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}
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}
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/**
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* Handles injecting the main Flutter web entrypoint (main.dart.js), and notifying
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* the user when Flutter is ready, through `didCreateEngineInitializer`.
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*
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* @see https://docs.flutter.dev/development/platform-integration/web/initialization
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*/
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class FlutterEntrypointLoader {
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/**
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* Creates a FlutterEntrypointLoader.
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*/
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constructor() {
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// Watchdog to prevent injecting the main entrypoint multiple times.
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this._scriptLoaded = false;
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}
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/**
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* Injects a TrustedTypesPolicy (or undefined if the feature is not supported).
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* @param {TrustedTypesPolicy | undefined} policy
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*/
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setTrustedTypesPolicy(policy) {
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this._ttPolicy = policy;
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}
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/**
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* Loads flutter main entrypoint, specified by `entrypointUrl`, and calls a
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* user-specified `onEntrypointLoaded` callback with an EngineInitializer
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* object when it's done.
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*
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* @param {*} options
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* @returns {Promise | undefined} that will eventually resolve with an
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* EngineInitializer, or will be rejected with the error caused by the loader.
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* Returns undefined when an `onEntrypointLoaded` callback is supplied in `options`.
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*/
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async loadEntrypoint(options) {
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const { entrypointUrl = `${baseUri}main.dart.js`, onEntrypointLoaded } =
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options || {};
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return this._loadEntrypoint(entrypointUrl, onEntrypointLoaded);
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}
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/**
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* Resolves the promise created by loadEntrypoint, and calls the `onEntrypointLoaded`
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* function supplied by the user (if needed).
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*
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* Called by Flutter through `_flutter.loader.didCreateEngineInitializer` method,
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* which is bound to the correct instance of the FlutterEntrypointLoader by
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* the FlutterLoader object.
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*
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* @param {Function} engineInitializer @see https://github.com/flutter/engine/blob/main/lib/web_ui/lib/src/engine/js_interop/js_loader.dart#L42
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*/
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didCreateEngineInitializer(engineInitializer) {
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if (typeof this._didCreateEngineInitializerResolve === "function") {
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this._didCreateEngineInitializerResolve(engineInitializer);
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// Remove the resolver after the first time, so Flutter Web can hot restart.
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this._didCreateEngineInitializerResolve = null;
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// Make the engine revert to "auto" initialization on hot restart.
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delete _flutter.loader.didCreateEngineInitializer;
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}
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if (typeof this._onEntrypointLoaded === "function") {
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this._onEntrypointLoaded(engineInitializer);
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}
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}
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/**
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* Injects a script tag into the DOM, and configures this loader to be able to
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* handle the "entrypoint loaded" notifications received from Flutter web.
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*
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* @param {string} entrypointUrl the URL of the script that will initialize
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* Flutter.
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* @param {Function} onEntrypointLoaded a callback that will be called when
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* Flutter web notifies this object that the entrypoint is
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* loaded.
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* @returns {Promise | undefined} a Promise that resolves when the entrypoint
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* is loaded, or undefined if `onEntrypointLoaded`
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* is a function.
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*/
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_loadEntrypoint(entrypointUrl, onEntrypointLoaded) {
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const useCallback = typeof onEntrypointLoaded === "function";
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if (!this._scriptLoaded) {
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this._scriptLoaded = true;
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const scriptTag = this._createScriptTag(entrypointUrl);
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if (useCallback) {
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// Just inject the script tag, and return nothing; Flutter will call
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// `didCreateEngineInitializer` when it's done.
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console.debug("Injecting <script> tag. Using callback.");
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this._onEntrypointLoaded = onEntrypointLoaded;
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document.body.append(scriptTag);
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} else {
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// Inject the script tag and return a promise that will get resolved
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// with the EngineInitializer object from Flutter when it calls
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// `didCreateEngineInitializer` later.
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return new Promise((resolve, reject) => {
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console.debug(
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"Injecting <script> tag. Using Promises. Use the callback approach instead!"
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);
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this._didCreateEngineInitializerResolve = resolve;
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scriptTag.addEventListener("error", reject);
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document.body.append(scriptTag);
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});
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}
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}
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}
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/**
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* Creates a script tag for the given URL.
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* @param {string} url
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* @returns {HTMLScriptElement}
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*/
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_createScriptTag(url) {
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const scriptTag = document.createElement("script");
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scriptTag.type = "application/javascript";
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// Apply TrustedTypes validation, if available.
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let trustedUrl = url;
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if (this._ttPolicy != null) {
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trustedUrl = this._ttPolicy.createScriptURL(url);
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}
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scriptTag.src = trustedUrl;
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return scriptTag;
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}
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}
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/**
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* The public interface of _flutter.loader. Exposes two methods:
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* * loadEntrypoint (which coordinates the default Flutter web loading procedure)
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* * didCreateEngineInitializer (which is called by Flutter to notify that its
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* Engine is ready to be initialized)
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*/
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class FlutterLoader {
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/**
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* Initializes the Flutter web app.
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* @param {*} options
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* @returns {Promise?} a (Deprecated) Promise that will eventually resolve
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* with an EngineInitializer, or will be rejected with
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* any error caused by the loader. Or Null, if the user
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* supplies an `onEntrypointLoaded` Function as an option.
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*/
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async loadEntrypoint(options) {
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const { serviceWorker, ...entrypoint } = options || {};
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// A Trusted Types policy that is going to be used by the loader.
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const flutterTT = new FlutterTrustedTypesPolicy();
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// The FlutterServiceWorkerLoader instance could be injected as a dependency
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// (and dynamically imported from a module if not present).
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const serviceWorkerLoader = new FlutterServiceWorkerLoader();
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serviceWorkerLoader.setTrustedTypesPolicy(flutterTT.policy);
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await serviceWorkerLoader.loadServiceWorker(serviceWorker).catch(e => {
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// Regardless of what happens with the injection of the SW, the show must go on
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console.warn("Exception while loading service worker:", e);
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});
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// The FlutterEntrypointLoader instance could be injected as a dependency
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// (and dynamically imported from a module if not present).
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const entrypointLoader = new FlutterEntrypointLoader();
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entrypointLoader.setTrustedTypesPolicy(flutterTT.policy);
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// Install the `didCreateEngineInitializer` listener where Flutter web expects it to be.
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this.didCreateEngineInitializer =
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entrypointLoader.didCreateEngineInitializer.bind(entrypointLoader);
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return entrypointLoader.loadEntrypoint(entrypoint);
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}
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}
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_flutter.loader = new FlutterLoader();
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})();
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