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/**
* @license
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {appContext} from '../../../services/app-context';
import {importHref} from '../../../scripts/import-href';
import {
PLUGIN_LOADING_TIMEOUT_MS,
PRELOADED_PROTOCOL,
getPluginNameFromUrl,
} from './gr-api-utils';
import {Plugin} from './gr-public-js-api';
import {getBaseUrl} from '../../../utils/url-util';
import {getPluginEndpoints} from './gr-plugin-endpoints';
import {PluginApi} from '../../plugins/gr-plugin-types';
import {ReportingService} from '../../../services/gr-reporting/gr-reporting';
import {hasOwnProperty} from '../../../utils/common-util';
enum PluginState {
/** State that indicates the plugin is pending to be loaded. */
PENDING = 'PENDING',
/** State that indicates the plugin is already loaded. */
LOADED = 'LOADED',
/** State that indicates the plugin failed to load. */
LOAD_FAILED = 'LOAD_FAILED',
}
interface PluginObject {
name: string;
url: string;
state: PluginState;
plugin: PluginApi | null;
}
interface PluginOption {
sync?: boolean;
}
export interface PluginOptionMap {
[path: string]: PluginOption;
}
type GerritScriptElement = HTMLScriptElement & {
__importElement: HTMLScriptElement;
};
type PluginCallback = (plugin: PluginApi) => void;
interface PluginCallbackMap {
[name: string]: PluginCallback;
}
interface GerritGlobal {
_preloadedPlugins?: PluginCallbackMap;
}
// Prefix for any unrecognized plugin urls.
// Url should match following patterns:
// /plugins/PLUGINNAME/static/SCRIPTNAME.(html|js)
// /plugins/PLUGINNAME.(js|html)
const UNKNOWN_PLUGIN_PREFIX = '__$$__';
// Current API version for Plugin,
// plugins with incompatible version will not be laoded.
const API_VERSION = '0.1';
/**
* PluginLoader, responsible for:
*
* Loading all plugins and handling errors etc.
* Recording plugin state.
* Reporting on plugin loading status.
* Retrieve plugin.
* Check plugin status and if all plugins loaded.
*/
export class PluginLoader {
_pluginListLoaded = false;
_plugins = new Map<string, PluginObject>();
_reporting: ReportingService | null = null;
// Promise that resolves when all plugins loaded
_loadingPromise: Promise<void> | null = null;
// Resolver to resolve _loadingPromise once all plugins loaded
_loadingResolver: (() => void) | null = null;
_getReporting() {
if (!this._reporting) {
this._reporting = appContext.reportingService;
}
return this._reporting;
}
/**
* Use the plugin name or use the full url if not recognized.
*/
_getPluginKeyFromUrl(url: string) {
return getPluginNameFromUrl(url) || `${UNKNOWN_PLUGIN_PREFIX}${url}`;
}
/**
* Load multiple plugins with certain options.
*/
loadPlugins(plugins: string[] = [], opts: PluginOptionMap = {}) {
this._pluginListLoaded = true;
plugins.forEach(path => {
const url = this._urlFor(path, window.ASSETS_PATH);
// Skip if preloaded, for bundling.
if (this.isPluginPreloaded(url)) return;
const pluginKey = this._getPluginKeyFromUrl(url);
// Skip if already installed.
if (this._plugins.has(pluginKey)) return;
this._plugins.set(pluginKey, {
name: pluginKey,
url,
state: PluginState.PENDING,
plugin: null,
});
if (this._isPathEndsWith(url, '.html')) {
this._importHtmlPlugin(path, opts && opts[path]);
} else if (this._isPathEndsWith(url, '.js')) {
this._loadJsPlugin(path);
} else {
this._failToLoad(`Unrecognized plugin path ${path}`, path);
}
});
this.awaitPluginsLoaded().then(() => {
console.info('Plugins loaded');
this._getReporting().pluginsLoaded(this._getAllInstalledPluginNames());
});
}
_isPathEndsWith(url: string | URL, suffix: string) {
if (!(url instanceof URL)) {
try {
url = new URL(url);
} catch (e) {
console.warn(e);
return false;
}
}
return url.pathname && url.pathname.endsWith(suffix);
}
_getAllInstalledPluginNames() {
const installedPlugins = [];
for (const plugin of this._plugins.values()) {
if (plugin.state === PluginState.LOADED) {
installedPlugins.push(plugin.name);
}
}
return installedPlugins;
}
install(
callback: (plugin: PluginApi) => void,
version?: string,
src?: string
) {
// HTML import polyfill adds __importElement pointing to the import tag.
const gerritScript = document.currentScript as GerritScriptElement | null;
const script = gerritScript?.__importElement ?? gerritScript;
if (!src && script && script.src) {
src = script.src;
}
if ((!src || src.startsWith('data:')) && script && script.baseURI) {
src = script && script.baseURI;
}
if (!src) {
this._failToLoad('Failed to determine src.');
return;
}
if (version && version !== API_VERSION) {
this._failToLoad(
`Plugin ${src} install error: only version ${API_VERSION} is supported in PolyGerrit. ${version} was given.`,
src
);
return;
}
const url = this._urlFor(src);
const pluginObject = this.getPlugin(url);
let plugin = pluginObject && pluginObject.plugin;
if (!plugin) {
plugin = new Plugin(url);
}
try {
callback(plugin);
this._pluginInstalled(url, plugin);
} catch (e) {
this._failToLoad(`${e.name}: ${e.message}`, src);
}
}
// The polygerrit uses version of sinon where you can't stub getter,
// declare it as a function here
arePluginsLoaded() {
// As the size of plugins is relatively small,
// so the performance of this check should be reasonable
if (!this._pluginListLoaded) return false;
for (const plugin of this._plugins.values()) {
if (plugin.state === PluginState.PENDING) return false;
}
return true;
}
_checkIfCompleted() {
if (this.arePluginsLoaded()) {
getPluginEndpoints().setPluginsReady();
if (this._loadingResolver) {
this._loadingResolver();
this._loadingResolver = null;
this._loadingPromise = null;
}
}
}
_timeout() {
const pendingPlugins = [];
for (const plugin of this._plugins.values()) {
if (plugin.state === PluginState.PENDING) {
this._updatePluginState(plugin.url, PluginState.LOAD_FAILED);
this._checkIfCompleted();
pendingPlugins.push(plugin.url);
}
}
return `Timeout when loading plugins: ${pendingPlugins.join(',')}`;
}
_failToLoad(message: string, pluginUrl?: string) {
// Show an alert with the error
document.dispatchEvent(
new CustomEvent('show-alert', {
detail: {
message: `Plugin install error: ${message} from ${pluginUrl}`,
},
})
);
if (pluginUrl) this._updatePluginState(pluginUrl, PluginState.LOAD_FAILED);
this._checkIfCompleted();
}
_updatePluginState(pluginUrl: string, state: PluginState): PluginObject {
const key = this._getPluginKeyFromUrl(pluginUrl);
if (this._plugins.has(key)) {
this._plugins.get(key)!.state = state;
} else {
// Plugin is not recorded for some reason.
console.info(`Plugin loaded separately: ${pluginUrl}`);
this._plugins.set(key, {
name: key,
url: pluginUrl,
state,
plugin: null,
});
}
return this._plugins.get(key)!;
}
_pluginInstalled(url: string, plugin: PluginApi) {
const pluginObj = this._updatePluginState(url, PluginState.LOADED);
pluginObj.plugin = plugin;
this._getReporting().pluginLoaded(plugin.getPluginName() || url);
console.info(`Plugin ${plugin.getPluginName() || url} installed.`);
this._checkIfCompleted();
}
installPreloadedPlugins() {
const Gerrit = window.Gerrit as GerritGlobal;
if (!Gerrit || !Gerrit._preloadedPlugins) {
return;
}
for (const name of Object.keys(Gerrit._preloadedPlugins)) {
const callback = Gerrit._preloadedPlugins[name];
this.install(callback, API_VERSION, PRELOADED_PROTOCOL + name);
}
}
isPluginPreloaded(pathOrUrl: string) {
const url = this._urlFor(pathOrUrl);
const name = getPluginNameFromUrl(url);
const Gerrit = window.Gerrit as GerritGlobal;
if (name && Gerrit?._preloadedPlugins) {
return hasOwnProperty(Gerrit._preloadedPlugins, name);
} else {
return false;
}
}
/**
* Checks if given plugin path/url is enabled or not.
*/
isPluginEnabled(pathOrUrl: string) {
const url = this._urlFor(pathOrUrl);
if (this.isPluginPreloaded(url)) return true;
const key = this._getPluginKeyFromUrl(url);
return this._plugins.has(key);
}
/**
* Returns the plugin object with a given url.
*/
getPlugin(pathOrUrl: string) {
const url = this._urlFor(pathOrUrl);
const key = this._getPluginKeyFromUrl(url);
return this._plugins.get(key);
}
/**
* Checks if given plugin path/url is loaded or not.
*/
isPluginLoaded(pathOrUrl: string): boolean {
const url = this._urlFor(pathOrUrl);
const key = this._getPluginKeyFromUrl(url);
return this._plugins.has(key)
? this._plugins.get(key)!.state === PluginState.LOADED
: false;
}
_importHtmlPlugin(pluginUrl: string, opts: PluginOption = {}) {
const urlWithAP = this._urlFor(pluginUrl, window.ASSETS_PATH);
const urlWithoutAP = this._urlFor(pluginUrl);
let onerror = undefined;
if (urlWithAP !== urlWithoutAP) {
onerror = () => this._loadHtmlPlugin(urlWithoutAP, opts.sync);
}
this._loadHtmlPlugin(urlWithAP, opts.sync, onerror);
}
_loadHtmlPlugin(url: string, sync?: boolean, onerror?: (e: Event) => void) {
if (!onerror) {
onerror = () => {
this._failToLoad(`${url} import error`, url);
};
}
importHref(url, () => {}, onerror, !sync);
}
_loadJsPlugin(pluginUrl: string) {
const urlWithAP = this._urlFor(pluginUrl, window.ASSETS_PATH);
const urlWithoutAP = this._urlFor(pluginUrl);
let onerror = undefined;
if (urlWithAP !== urlWithoutAP) {
onerror = () => this._createScriptTag(urlWithoutAP);
}
this._createScriptTag(urlWithAP, onerror);
}
_createScriptTag(url: string, onerror?: OnErrorEventHandler) {
if (!onerror) {
onerror = () => this._failToLoad(`${url} load error`, url);
}
const el = document.createElement('script');
el.defer = true;
el.setAttribute('src', url);
// no credentials to send when fetch plugin js
// and this will help provide more meaningful error than
// 'Script error.'
el.setAttribute('crossorigin', 'anonymous');
el.onerror = onerror;
return document.body.appendChild(el);
}
_urlFor(pathOrUrl: string, assetsPath?: string): string {
// theme is per host, should always load from assetsPath
const isThemeFile =
pathOrUrl.endsWith('static/gerrit-theme.html') ||
pathOrUrl.endsWith('static/gerrit-theme.js');
const shouldTryLoadFromAssetsPathFirst = !isThemeFile && assetsPath;
if (
pathOrUrl.startsWith(PRELOADED_PROTOCOL) ||
pathOrUrl.startsWith('http')
) {
// Plugins are loaded from another domain or preloaded.
if (
pathOrUrl.includes(location.host) &&
shouldTryLoadFromAssetsPathFirst &&
assetsPath
) {
// if is loading from host server, try replace with cdn when assetsPath provided
return pathOrUrl.replace(location.origin, assetsPath);
}
return pathOrUrl;
}
if (!pathOrUrl.startsWith('/')) {
pathOrUrl = '/' + pathOrUrl;
}
if (shouldTryLoadFromAssetsPathFirst && assetsPath) {
return assetsPath + pathOrUrl;
}
return window.location.origin + getBaseUrl() + pathOrUrl;
}
awaitPluginsLoaded() {
// Resolve if completed.
this._checkIfCompleted();
if (this.arePluginsLoaded()) {
return Promise.resolve();
}
if (!this._loadingPromise) {
// TODO(TS): Should be a number, but TS thinks that is must be some weird
// NodeJS.Timeout object.
let timerId: any;
this._loadingPromise = Promise.race([
new Promise(resolve => (this._loadingResolver = resolve)),
new Promise(
(_, reject) =>
(timerId = setTimeout(() => {
reject(new Error(this._timeout()));
}, PLUGIN_LOADING_TIMEOUT_MS))
),
]).finally(() => {
if (timerId) clearTimeout(timerId);
}) as Promise<void>;
}
return this._loadingPromise;
}
}
// TODO(dmfilippov): Convert to service and add to appContext
let pluginLoader = new PluginLoader();
export function _testOnly_resetPluginLoader() {
pluginLoader = new PluginLoader();
return pluginLoader;
}
export function getPluginLoader() {
return pluginLoader;
}