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* @license
* Copyright 2019 Google LLC
*
* 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 { getKey } from '../util/get-key';
import { AppConfig } from '../interfaces/app-config';
import { IdChangeCallbackFn } from '../functions';
const fidChangeCallbacks: Map<string, Set<IdChangeCallbackFn>> = new Map();
/**
* Calls the onIdChange callbacks with the new FID value, and broadcasts the
* change to other tabs.
*/
export function fidChanged(appConfig: AppConfig, fid: string): void {
const key = getKey(appConfig);
callFidChangeCallbacks(key, fid);
broadcastFidChange(key, fid);
}
export function addCallback(
appConfig: AppConfig,
callback: IdChangeCallbackFn
): void {
// Open the broadcast channel if it's not already open,
// to be able to listen to change events from other tabs.
getBroadcastChannel();
const key = getKey(appConfig);
let callbackSet = fidChangeCallbacks.get(key);
if (!callbackSet) {
callbackSet = new Set();
fidChangeCallbacks.set(key, callbackSet);
}
callbackSet.add(callback);
}
export function removeCallback(
appConfig: AppConfig,
callback: IdChangeCallbackFn
): void {
const key = getKey(appConfig);
const callbackSet = fidChangeCallbacks.get(key);
Iif (!callbackSet) {
return;
}
callbackSet.delete(callback);
Iif (callbackSet.size === 0) {
fidChangeCallbacks.delete(key);
}
// Close broadcast channel if there are no more callbacks.
closeBroadcastChannel();
}
function callFidChangeCallbacks(key: string, fid: string): void {
const callbacks = fidChangeCallbacks.get(key);
if (!callbacks) {
return;
}
for (const callback of callbacks) {
callback(fid);
}
}
function broadcastFidChange(key: string, fid: string): void {
const channel = getBroadcastChannel();
Eif (channel) {
channel.postMessage({ key, fid });
}
closeBroadcastChannel();
}
let broadcastChannel: BroadcastChannel | null = null;
/** Opens and returns a BroadcastChannel if it is supported by the browser. */
function getBroadcastChannel(): BroadcastChannel | null {
if (!broadcastChannel && 'BroadcastChannel' in self) {
broadcastChannel = new BroadcastChannel('[Firebase] FID Change');
broadcastChannel.onmessage = e => {
callFidChangeCallbacks(e.data.key, e.data.fid);
};
}
return broadcastChannel;
}
function closeBroadcastChannel(): void {
if (fidChangeCallbacks.size === 0 && broadcastChannel) {
broadcastChannel.close();
broadcastChannel = null;
}
}
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