121 lines
3.5 KiB
TypeScript
121 lines
3.5 KiB
TypeScript
// Copyright 2020-2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { get, throttle } from 'lodash';
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import type { WebAPIType } from './textsecure/WebAPI';
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export type ConfigKeyType =
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| 'desktop.announcementGroup'
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| 'desktop.clientExpiration'
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| 'desktop.disableGV1'
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| 'desktop.groupCalling'
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| 'desktop.gv2'
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| 'desktop.mandatoryProfileSharing'
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| 'desktop.mediaQuality.levels'
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| 'desktop.messageRequests'
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| 'desktop.retryReceiptLifespan'
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| 'desktop.retryRespondMaxAge'
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| 'desktop.screensharing2'
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| 'desktop.senderKey.send'
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| 'desktop.senderKey.retry'
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| 'desktop.sendSenderKey2'
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| 'desktop.storage'
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| 'desktop.storageWrite3'
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| 'desktop.worksAtSignal'
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| 'global.groupsv2.groupSizeHardLimit'
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| 'global.groupsv2.maxGroupSize';
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type ConfigValueType = {
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name: ConfigKeyType;
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enabled: boolean;
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enabledAt?: number;
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value?: unknown;
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};
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export type ConfigMapType = { [key: string]: ConfigValueType };
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type ConfigListenerType = (value: ConfigValueType) => unknown;
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type ConfigListenersMapType = {
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[key: string]: Array<ConfigListenerType>;
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};
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let config: ConfigMapType = {};
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const listeners: ConfigListenersMapType = {};
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export async function initRemoteConfig(server: WebAPIType): Promise<void> {
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config = window.storage.get('remoteConfig') || {};
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await maybeRefreshRemoteConfig(server);
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}
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export function onChange(
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key: ConfigKeyType,
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fn: ConfigListenerType
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): () => void {
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const keyListeners: Array<ConfigListenerType> = get(listeners, key, []);
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keyListeners.push(fn);
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listeners[key] = keyListeners;
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return () => {
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listeners[key] = listeners[key].filter(l => l !== fn);
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};
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}
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export const refreshRemoteConfig = async (
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server: WebAPIType
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): Promise<void> => {
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const now = Date.now();
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const newConfig = await server.getConfig();
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// Process new configuration in light of the old configuration
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// The old configuration is not set as the initial value in reduce because
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// flags may have been deleted
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const oldConfig = config;
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config = newConfig.reduce((acc, { name, enabled, value }) => {
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const previouslyEnabled: boolean = get(oldConfig, [name, 'enabled'], false);
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const previousValue: unknown = get(oldConfig, [name, 'value'], undefined);
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// If a flag was previously not enabled and is now enabled,
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// record the time it was enabled
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const enabledAt: number | undefined =
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previouslyEnabled && enabled ? now : get(oldConfig, [name, 'enabledAt']);
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const configValue = {
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name: name as ConfigKeyType,
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enabled,
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enabledAt,
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value,
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};
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const hasChanged =
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previouslyEnabled !== enabled || previousValue !== configValue.value;
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// If enablement changes at all, notify listeners
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const currentListeners = listeners[name] || [];
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if (hasChanged) {
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window.log.info(`Remote Config: Flag ${name} has changed`);
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currentListeners.forEach(listener => {
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listener(configValue);
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});
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}
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// Return new configuration object
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return {
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...acc,
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[name]: configValue,
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};
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}, {});
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window.storage.put('remoteConfig', config);
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};
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export const maybeRefreshRemoteConfig = throttle(
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refreshRemoteConfig,
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// Only fetch remote configuration if the last fetch was more than two hours ago
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2 * 60 * 60 * 1000,
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{ trailing: false }
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);
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export function isEnabled(name: ConfigKeyType): boolean {
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return get(config, [name, 'enabled'], false);
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}
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export function getValue(name: ConfigKeyType): string | undefined {
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return get(config, [name, 'value'], undefined);
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}
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