c3edd3e25e
* Enable lint rules for Promise handling to discourage misuse of them. Squashed all of Hugh's commits into one. --------- Co-authored-by: Hugh Nimmo-Smith <hughns@element.io>
90 lines
2.7 KiB
TypeScript
90 lines
2.7 KiB
TypeScript
/*
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Copyright 2021-2024 New Vector Ltd.
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SPDX-License-Identifier: AGPL-3.0-only
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Please see LICENSE in the repository root for full details.
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*/
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import { getUrlParams } from "../UrlParams";
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import {
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DEFAULT_CONFIG,
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ConfigOptions,
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ResolvedConfigOptions,
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} from "./ConfigOptions";
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export class Config {
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private static internalInstance: Config | undefined;
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public static get(): ConfigOptions {
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if (!this.internalInstance?.config)
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throw new Error("Config instance read before config got initialized");
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return this.internalInstance.config;
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}
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public static async init(): Promise<void> {
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if (!Config.internalInstance?.initPromise) {
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const internalInstance = new Config();
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Config.internalInstance = internalInstance;
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Config.internalInstance.initPromise = downloadConfig(
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"../config.json",
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).then((config) => {
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internalInstance.config = { ...DEFAULT_CONFIG, ...config };
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});
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}
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return Config.internalInstance.initPromise;
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}
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/**
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* This is a alternative initializer that does not load anything
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* from a hosted config file but instead just initializes the config using the
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* default config.
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*
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* It is supposed to only be used in tests. (It is executed in `vite.setup.js`)
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*/
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public static initDefault(): void {
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Config.internalInstance = new Config();
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Config.internalInstance.config = { ...DEFAULT_CONFIG };
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}
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// Convenience accessors
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public static defaultHomeserverUrl(): string | undefined {
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return (
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getUrlParams().homeserver ??
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Config.get().default_server_config?.["m.homeserver"].base_url
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);
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}
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public static defaultServerName(): string | undefined {
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const homeserver = getUrlParams().homeserver;
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if (homeserver) {
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const url = new URL(homeserver);
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return url.hostname;
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}
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return Config.get().default_server_config?.["m.homeserver"].server_name;
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}
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public config?: ResolvedConfigOptions;
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private initPromise?: Promise<void>;
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}
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async function downloadConfig(
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configJsonFilename: string,
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): Promise<ConfigOptions> {
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const url = new URL(configJsonFilename, window.location.href);
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url.searchParams.set("cachebuster", Date.now().toString());
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const res = await fetch(url, {
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cache: "no-cache",
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method: "GET",
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});
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if (!res.ok || res.status === 404 || res.status === 0) {
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// Lack of a config isn't an error, we should just use the defaults.
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// Also treat a blank config as no config, assuming the status code is 0, because we don't get 404s from file:
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// URIs so this is the only way we can not fail if the file doesn't exist when loading from a file:// URI.
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return DEFAULT_CONFIG;
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}
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return res.json();
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}
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