20
Web-push Notification using React and Node js
public/custom-sw.js
console.log("Service Worker Loaded...");
self.addEventListener('push', event => {
const data = event.data.json()
console.log('New notification', data)
event.waitUntil(
self.registration.showNotification(data.title, {
body:data.description,
icon:data.icon
})
);
})src/serviceWorker.js
// This optional code is used to register a service worker.
// register() is not called by default.
// This lets the app load faster on subsequent visits in production, and gives
// it offline capabilities. However, it also means that developers (and users)
// will only see deployed updates on subsequent visits to a page, after all the
// existing tabs open on the page have been closed, since previously cached
// resources are updated in the background.
// To learn more about the benefits of this model and instructions on how to
// opt-in, read https://bit.ly/CRA-PWA
const isLocalhost = Boolean(
window.location.hostname === 'localhost' ||
// [::1] is the IPv6 localhost address.
window.location.hostname === '[::1]' ||
// 127.0.0.1/8 is considered localhost for IPv4.
window.location.hostname.match(
/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
)
);
export function register(config) {
if ('serviceWorker' in navigator) {
// The URL constructor is available in all browsers that support SW.
const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
if (publicUrl.origin !== window.location.origin) {
// Our service worker won't work if PUBLIC_URL is on a different origin
// from what our page is served on. This might happen if a CDN is used to
// serve assets; see https://github.com/facebook/create-react-app/issues/2374
return;
}
window.addEventListener('load', () => {
const swFileName = process.env.NODE_ENV === 'production' ? 'service-worker.js' : 'custom-sw.js'
const swUrl = `${process.env.PUBLIC_URL}/${swFileName}`;
if (isLocalhost) {
// This is running on localhost. Let's check if a service worker still exists or not.
checkValidServiceWorker(swUrl, config);
// Add some additional logging to localhost, pointing developers to the
// service worker/PWA documentation.
navigator.serviceWorker.ready.then(() => {
console.log(
'This web app is being served cache-first by a service ' +
'worker. To learn more, visit https://bit.ly/CRA-PWA'
);
});
} else {
// Is not localhost. Just register service worker
registerValidSW(swUrl, config);
}
});
}
}
function registerValidSW(swUrl, config) {
navigator.serviceWorker
.register(swUrl)
.then(registration => {
registration.onupdatefound = () => {
const installingWorker = registration.installing;
if (installingWorker == null) {
return;
}
installingWorker.onstatechange = () => {
if (installingWorker.state === 'installed') {
if (navigator.serviceWorker.controller) {
// At this point, the updated precached content has been fetched,
// but the previous service worker will still serve the older
// content until all client tabs are closed.
console.log(
'New content is available and will be used when all ' +
'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
);
// Execute callback
if (config && config.onUpdate) {
config.onUpdate(registration);
}
} else {
// At this point, everything has been precached.
// It's the perfect time to display a
// "Content is cached for offline use." message.
console.log('Content is cached for offline use.');
// Execute callback
if (config && config.onSuccess) {
config.onSuccess(registration);
}
}
}
};
};
})
.catch(error => {
console.error('Error during service worker registration:', error);
});
}
function checkValidServiceWorker(swUrl, config) {
// Check if the service worker can be found. If it can't reload the page.
fetch(swUrl)
.then(response => {
// Ensure service worker exists, and that we really are getting a JS file.
const contentType = response.headers.get('content-type');
if (
response.status === 404 ||
(contentType != null && contentType.indexOf('javascript') === -1)
) {
// No service worker found. Probably a different app. Reload the page.
navigator.serviceWorker.ready.then(registration => {
registration.unregister().then(() => {
window.location.reload();
});
});
} else {
// Service worker found. Proceed as normal.
registerValidSW(swUrl, config);
}
})
.catch(() => {
console.log(
'No internet connection found. App is running in offline mode.'
);
});
}
export function unregister() {
if ('serviceWorker' in navigator) {
navigator.serviceWorker.ready.then(registration => {
registration.unregister();
});
}
}src/subscription.js
const convertedVapidKey = urlBase64ToUint8Array("YOUR_PUBLIC VAPID_KEY")
function urlBase64ToUint8Array(base64String) {
const padding = "=".repeat((4 - base64String.length % 4) % 4)
// eslint-disable-next-line
const base64 = (base64String + padding).replace(/\-/g, "+").replace(/_/g, "/")
const rawData = window.atob(base64)
const outputArray = new Uint8Array(rawData.length)
for (let i = 0; i < rawData.length; ++i) {
outputArray[i] = rawData.charCodeAt(i)
}
return outputArray
}
function sendSubscription(subscription) {
return fetch(`/notifications/subscribe`, {
method: 'POST',
body: JSON.stringify({
subscription:subscription,
title:"Notified by Precision Ordance",
description:"someone buy a product",
icon:"https://ichef.bbci.co.uk/news/976/cpsprodpb/9A50/production/_118740593_gettyimages-1231144196.jpg"
}),
headers: {
'Content-Type': 'application/json'
}
})
}
//conditional render
let clicked = true
export function subscribeUser() {
if(clicked) {
if ('serviceWorker' in navigator) {
navigator.serviceWorker.ready.then(function(registration) {
if (!registration.pushManager) {
console.log('Push manager unavailable.')
return
}
registration.pushManager.getSubscription().then(function(existedSubscription) {
if (existedSubscription === null) {
console.log('No subscription detected, make a request.')
registration.pushManager.subscribe({
applicationServerKey: convertedVapidKey,
userVisibleOnly: true,
}).then(function(newSubscription) {
console.log('New subscription added.',newSubscription)
sendSubscription(newSubscription)
}).catch(function(e) {
if (Notification.permission !== 'granted') {
console.log('Permission was not granted.')
} else {
console.error('An error ocurred during the subscription process.', e)
}
})
} else {
console.log('Existed subscription detected.')
sendSubscription(existedSubscription)
}
})
})
.catch(function(e) {
console.error('An error ocurred during Service Worker registration.', e)
})
}
}else{
console.log('Can not reachable to the service worker');
}}src/App.JS
import './App.css';
import { subscribeUser } from './subscription';
function App() {
return (
<div className="App">
<header className="App-header">
<button onClick={subscribeUser}>Click Here</button>
<p>
Edit <code>src/App.js</code> and save to reload.
</p>
<a
className="App-link"
href="https://reactjs.org"
target="_blank"
rel="noopener noreferrer"
>
Learn React
</a>
</header>
</div>
);
}
export default App;src/index.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import './index.css';
import * as serviceWorker from './serviceWorker';
import { subscribeUser } from './subscription';
ReactDOM.render(<App />, document.getElementById('root'));
serviceWorker.register();
subscribeUser()src/package.json()
just install one package-->npm i cra-append-sw
"dependencies": {
"@testing-library/jest-dom": "^5.15.0",
"@testing-library/react": "^11.2.7",
"@testing-library/user-event": "^12.8.3",
"cra-append-sw": "^2.7.0",
"react": "^17.0.2",
"react-dom": "^17.0.2",
"react-scripts": "4.0.3",
"web-vitals": "^1.1.2"
},index.js
const express = require('express')
const dotenv = require('dotenv')
const bodyParser = require('body-parser')
const cors = require('cors')
const webpush = require('web-push')
const app = express()
dotenv.config()
app.use(cors())
app.use(bodyParser.json())
###You can generate VAPID keys using the command:
**./node_modules/.bin/web-push generate-vapid-keys**
webpush.setVapidDetails("mailto: `YOUR EMAIL OR WEBSITE ADDRESS`", "YOUR-PUBLIC-VAPID-KEY", "YOUR-PRIVATE-VAPID-KEY")
app.get('/', (req, res) => {
res.send('Hello world!')
})
app.post('/notifications/subscribe', (req, res) => {
console.log(req.body);
const payload = JSON.stringify({
title:req.body.title,
description:req.body.description,
icon:req.body.icon
})
// console.log(req.body.subscription);
webpush.sendNotification(req.body.subscription, payload)
.then(result => console.log())
.catch(e => console.log(e.stack))
res.status(200).json({'success': true})
});
app.listen(8000, () => console.log('The server has been started on the port 8000'))20