ECE366 - Lesson 8
More React and Authentication
Instructor: Professor Hong
## Adding React to Docker Compose
Dockerfile
```
# pull official base image
FROM node:20
# set working directory
WORKDIR /app
# add `/app/node_modules/.bin` to $PATH
ENV PATH /app/node_modules/.bin:$PATH
# install app dependencies
COPY package.json ./
COPY package-lock.json ./
RUN npm install --silent
RUN npm install react-scripts@3.4.1 -g --silent
# add app
COPY . ./
# start app
CMD npm start
```
## Docker-Compose
docker-compose.yaml
```
services:
ui:
build: .
ports:
- 3000:3000
```
## React Forms
useRef - a hook that is going to reach out to some UI element and get its value, doesn't re-render; synchronous
```
import "./App.css";
import { useRef } from "react";
function App() {
const txtTitle = useRef();
const hexColor = useRef();
const submit = (e) => {
e.preventDefault();
const title = txtTitle.current.value;
const color = hexColor.current.value;
alert(`${title}, ${color}`);
txtTitle.current.value = "";
hexColor.current.value = "";
};
return (
<form onSubmit={submit}>
<input
ref={txtTitle}
type="text"
placeholder="color title..."
/>
<input ref={hexColor} type="color" />
<button>ADD</button>
</form>
);
}
export default App;
```
## React Forms with useState
useState - managing component state, re-renders at the end, asynchronous
```
import "./App.css";
import { useState } from "react";
function App() {
const [title, setTitle] = useState("");
const [color, setColor] = useState("#000000");
const submit = (e) => {
e.preventDefault();
alert(`${title}, ${color}`);
setTitle("");
setColor("#000000");
};
return (
<form onSubmit={submit}>
<input
value={title}
onChange={(event) =>
setTitle(event.target.value)
}
type="text"
placeholder="color title..."
/>
<input
value={color}
type="color"
onChange={(event) =>
setColor(event.target.value)
}
/>
<button>ADD</button>
</form>
);
}
export default App;
```
## Form Libraries
- formik
- react hook forms
## React Router
To install:
```
npm install --save react-router-dom
```
## Configuring the Router
App.js
```
import "./App.css";
function Home() {
return (
<div>
<h1>My Website</h1>
</div>
);
}
export function About() {
return (
<div>
<h1>About Us</h1>
</div>
);
}
export function Contact() {
return (
<div>
<h1>Contact Us</h1>
</div>
);
}
export function App() {
return <Home />;
}
```
## Configuring the Router
index.js
```
import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import { App, About, Contact } from "./App";
import {
BrowserRouter,
Routes,
Route
} from "react-router-dom";
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
<BrowserRouter>
<Routes>
<Route path="/" element={<App />} />
<Route path="/about" element={<About />} />
<Route
path="/contact"
element={<Contact />}
/>
</Routes>
</BrowserRouter>,
);
```
## Adding Links to the Router
App.js
```
import "./App.css";
import { Link } from "react-router-dom";
function Home() {
return (
<div>
<nav>
<Link to="/">Home</Link>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
</nav>
<h1>My Website</h1>
</div>
);
}
export function About() {
return (
<div>
<nav>
<Link to="/">Home</Link>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
</nav>
<h1>About Us</h1>
</div>
);
}
export function Contact() {
return (
<div>
<nav>
<Link to="/">Home</Link>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
</nav>
<h1>Contact Us</h1>
</div>
);
}
export function App() {
return <Home />;
}
```
## What is Axios?
Installation
```
npm install --save axios
```
- Another HTTP Client
## App.js with fetch
```
import "./App.css";
import { Link } from "react-router-dom";
import { useState, useEffect } from "react";
function Home() {
const [data, setData] = useState(null);
useEffect(() => {
fetch(
`http://localhost:8080/api/getUsers`
)
.then((response) => response.json())
.then(setData);
}, []);
if (data)
return (
<>
<h1>RPS</h1>
<nav>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
</nav>
<pre>{JSON.stringify(data, null, 2)}</pre>
</>
);
return <h1>Data</h1>;
}
export function About() {
return (
<div>
<nav>
<Link to="/">Home</Link>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
</nav>
<h1>About Us</h1>
</div>
);
}
export function Contact() {
return (
<div>
<nav>
<Link to="/">Home</Link>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
</nav>
<h1>Contact Us</h1>
</div>
);
}
export function App() {
return <Home />;
}
```
## App.js with Axios
```
function Home() {
const [data, setData] = useState(null);
useEffect(() => {
const loadUsers = async () => {
const response = await axios.get(`http://localhost:8080/api/getUsers`);
setData(response.data)
}
loadUsers();
}, []);
if (data)
return (
<>
<h1>RPS</h1>
<nav>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
</nav>
<pre>{JSON.stringify(data, null, 2)}</pre>
</>
);
return <h1>Data</h1>;
}
```
## Firebase
Installation
```
npm install --save firebase
```
## Setup Firebase
- Go to [https://console.firebase.google.com/](https://console.firebase.google.com/)
- Create a new project
- No need to select Google analytics
- Add firebase to your web app by clicking Web
- Insert public keys to index.js
- Get Started w/ Authentication
- Enable Email/Password and save
- Add a sample user
## Firebase Configuration
index.js
```
import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import { App, About, Contact } from "./App";
import {
BrowserRouter,
Routes,
Route
} from "react-router-dom";
// Import the functions you need from the SDKs you need
import { initializeApp } from "firebase/app";
import LoginPage from "./pages/LoginPage";
import CreateAccountPage from "./pages/CreateAccountPage";
// TODO: Add SDKs for Firebase products that you want to use
// https://firebase.google.com/docs/web/setup#available-libraries
// Your web app's Firebase configuration
const firebaseConfig = {
apiKey: "YOUR INFO HERE"
};
// Initialize Firebase
const app = initializeApp(firebaseConfig);
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
<BrowserRouter>
<Routes>
<Route path="/" element={<App />} />
<Route path="/about" element={<About />} />
<Route
path="/contact"
element={<Contact />}
/>
<Route path="/login" element={<LoginPage />} />
<Route path="/create-account" element={<CreateAccountPage />} />
</Routes>
</BrowserRouter>,
);
```
## Login Page
pages/LoginPage.js
```
import {useState} from "react";
import {Link, useNavigate} from "react-router-dom";
import {getAuth, signInWithEmailAndPassword} from 'firebase/auth';
const LoginPage = () => {
const [email, setEmail] = useState("");
const [password, setPassword] = useState("");
const [error, setError] = useState("");
const navigate = useNavigate();
const logIn = async () => {
try {
await signInWithEmailAndPassword(getAuth(), email, password);
navigate('/');
} catch (e) {
setError(e.message);
}
};
return (
<>
<h1>Log In</h1>
{error && <p className="error">{error}</p>}
<input
placeholder="Your email address"
value={email}
onChange={e=>setEmail(e.target.value)}
/>
<input
type="password"
placeholder="Your password"
value={password}
onChange={e=>setPassword(e.target.value)}
/>
<button onClick={logIn}>Log In</button>
<Link to="/create-account">Don't have an account? Create one here</Link>
</>
);
}
export default LoginPage;
```
- Calling firebase to log in and receive a token for authentication
## Create Account Page
pages/CreateAccountPage.js
```
import {useState} from "react";
import {Link, useNavigate} from "react-router-dom";
import {getAuth, createUserWithEmailAndPassword} from "firebase/auth";
const CreateAccountPage = () => {
const [email, setEmail] = useState("");
const [password, setPassword] = useState("");
const [confirmPassword, setConfirmPassword] = useState("");
const [error, setError] = useState("");
const navigate = useNavigate();
const createAccount = async () => {
try {
if (password !== confirmPassword) {
setError("Password and confirm password do not match");
return;
}
await createUserWithEmailAndPassword(getAuth(), email, password);
navigate("/");
} catch(e) {
setError(e.message);
}
};
return (
<>
<h1>Create Account</h1>
{error && <p className="error">{error}</p>}
<input
placeholder="Your email address"
value={email}
onChange={e=>setEmail(e.target.value)}
/>
<input
type="password"
placeholder="Your password"
value={password}
onChange={e=>setPassword(e.target.value)}
/>
<input
type="password"
placeholder="Re-enter your password"
value={confirmPassword}
onChange={e=>setConfirmPassword(e.target.value)}
/>
<button onClick={createAccount}>Log In</button>
<Link to="/login">Already have an account? Log in here.</Link>
</>
);
}
export default CreateAccountPage;
```
- Similar to log in, but with a different function
## useUser Hook
hooks/useUser.js
```
// custom hook
import {useState, useEffect} from "react";
import { getAuth, onAuthStateChanged} from "firebase/auth";
const useUser = () => {
const [user, setUser] = useState(null);
const [isLoading, setIsLoading] = useState(true);
useEffect(() => {
const unsubscribe = onAuthStateChanged(getAuth(), user => {
setUser(user);
setIsLoading(false);
});
return unsubscribe; // if user navigates away, removes hook
}, []); // only calls this when auth; only once
return {user, isLoading};
};
export default useUser;
```
- This gets the user info and checks if the screen is still loading
## Restrict User from Viewing Info
App.js
```
import useUser from "./hooks/useUser";
function Home() {
const [data, setData] = useState(null);
const {user, isLoading} = useUser();
useEffect(() => {
const loadUsers = async () => {
const response = await axios.get(`http://localhost:8080/api/getUsers`);
setData(response.data)
}
loadUsers();
}, [isLoading, user]);
if (data)
return (
<>
<h1>RPS</h1>
<nav>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
<Link to="/login">Login</Link>
</nav>
{user
? <pre>{JSON.stringify(data, null, 2)}</pre>
: <p>Log in to view sensitive info!</p>
}
</>
);
return <h1>Data</h1>;
}
```
- Note the conditional for the display of data
## Logging Out
```
import { Link, useNavigate } from "react-router-dom";
import {getAuth, signOut} from 'firebase/auth';
import useUser from "./hooks/useUser";
function Home() {
const [data, setData] = useState(null);
const {user, isLoading} = useUser();
const navigate = useNavigate();
useEffect(() => {
const loadUsers = async () => {
const response = await axios.get(`http://localhost:8080/api/getUsers`);
setData(response.data)
}
loadUsers();
}, [isLoading, user]);
if (data)
return (
<>
<h1>RPS</h1>
<nav>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
<Link to="/login">Login</Link>
{user
? <button onClick={() => {
signOut(getAuth());
}}>Log Out</button>
: <button onClick={() => {
navigate('/login')
}}>Log In</button>
}
</nav>
{user
? <pre>{JSON.stringify(data, null, 2)}</pre>
: <p>Log in to view sensitive info!</p>
}
</>
);
return <h1>Data</h1>;
}
```
## Authentication in Spring Boot
## Add Dependencies
```
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
```
resources/application.properties
```
spring.security.oauth2.resourceserver.jwt.jwk-set-uri=https://www.googleapis.com/service_accounts/v1/jwk/securetoken%40system.gserviceaccount.com
```
## WebSecurityConfiguration
config/WebSecurityConfiguration.java
```
package com.cooperps.rps.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.web.SecurityFilterChain;
import static org.springframework.security.config.Customizer.withDefaults;
@Configuration
public class WebSecurityConfiguration {
@Bean
public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
http
.authorizeHttpRequests((authz) -> authz
.anyRequest().authenticated()
)
.httpBasic(withDefaults());
http.oauth2ResourceServer()
.jwt();
return http.build();
}
}
```
## Add AppController to test
web/AppController.java
```
package com.cooperps.rps.web;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.security.Principal;
@RestController
@RequestMapping("/app")
public class AppController {
@GetMapping(path = "/test")
public String test(Principal principal) {
return principal.getName();
}
}
```
## Pass token to Server
```
function Home() {
const [data, setData] = useState(null);
const {user, isLoading} = useUser();
const navigate = useNavigate();
useEffect(() => {
const loadUsers = async () => {
const token = user && await user.getIdToken();
console.log(token);
const headers = token ? {Authorization: `Bearer ${token}`} : {};
const response = await axios.get(`http://localhost:8080/api/getUsers`, {headers});
setData(response.data)
}
if(!isLoading) {
loadUsers();
}
}, [isLoading, user]);
if (data)
return (
<>
<h1>RPS</h1>
<nav>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
<Link to="/login">Login</Link>
{user
? <button onClick={() => {
signOut(getAuth());
}}>Log Out</button>
: <button onClick={() => {
navigate('/login')
}}>Log In</button>
}
</nav>
{user
? <pre>{JSON.stringify(data, null, 2)}</pre>
: <p>Log in to view sensitive info!</p>
}
</>
);
return (
<>
<h1>RPS</h1>
<nav>
<Link to="/about">About</Link>
<Link to="/contact">Contact</Link>
<Link to="/login">Login</Link>
{user
? <button onClick={() => {
signOut(getAuth());
}}>Log Out</button>
: <button onClick={() => {
navigate('/login')
}}>Log In</button>
}
</nav>;
</>
);
}
```
## CORS again
package.json
```
"proxy": "http://localhost:8080/",
```
and restart with
```
npm start
```
## Putting it all together
## Initializing database
Dockerfile
```
FROM postgres
# Copy the SQL files to the container
COPY init.sql /docker-entrypoint-initdb.d/0_init.sql
COPY users.sql /docker-entrypoint-initdb.d/1_users.sql
COPY game.sql /docker-entrypoint-initdb.d/2_game.sql
```
## Spring Boot Service
```
FROM maven:3.9.6-eclipse-temurin-21 AS build
ADD . /project
WORKDIR /project
RUN mvn -e -Dmaven.test.skip package
FROM eclipse-temurin:latest
COPY --from=build /project/target/rpsjpa-0.0.1-SNAPSHOT.jar /app/rps.jar
ENTRYPOINT java -jar /app/rps.jar
```
## Update Proxy
package.json, main part of json
```
"proxy": "http://app:8080/",
```
## React UI
Dockerfile
```
# pull official base image
FROM node:20
# set working directory
WORKDIR /app
# add `/app/node_modules/.bin` to $PATH
ENV PATH /app/node_modules/.bin:$PATH
# install app dependencies
COPY package.json ./
COPY package-lock.json ./
RUN npm install --silent
RUN npm install react-scripts@3.4.1 -g --silent
# add app
COPY . ./
# start app
CMD npm start
```
## Docker-Compose
docker-compose.yaml
```
services:
db:
image: postgres
build:
context: db
environment:
- POSTGRES_DB=postgres
- POSTGRES_PASSWORD=password
expose:
- 5432:5432
ports:
- 5432:5432
restart: always
app:
build: server/rps
expose:
- 8080:8080
ports:
- 8080:8080
environment:
- POSTGRES_DB=postgres
- POSTGRES_PASSWORD=password
depends_on:
- db
ui:
build: client
ports:
- 3000:3000
depends_on:
- app
```
## RPS Game Logic
- Add server side logic
- Add UI to communicate with server
## STOMP
- Simple/Streaming Text Oriented Message Protocol
- Allows you to create an interactive web application
- The web is the STOMP client
- The service is the message broker
- Example from [https://spring.io/guides/gs/messaging-stomp-websocket/](https://spring.io/guides/gs/messaging-stomp-websocket/)
## Pre-initialized Spring Initializr
[Pre-initialized Initializr](https://start.spring.io/#!type=maven-project&groupId=com.example&artifactId=messaging-stomp-websocket&name=messaging-stomp-websocket&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.messaging-stomp-websocket&dependencies=websocket)
Additional pom.xml dependencies
```
<dependency>
<groupId>org.webjars</groupId>
<artifactId>webjars-locator-core</artifactId>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>sockjs-client</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>stomp-websocket</artifactId>
<version>2.3.3</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.7</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.1.1-1</version>
</dependency>
```
## HelloMessage Class
HelloMessage.java
```
package com.example.messagingstompwebsocket;
public class HelloMessage {
private String name;
public HelloMessage() {
}
public HelloMessage(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
```
## Greeting Class
Greeting.java
```
package com.example.messagingstompwebsocket;
public class Greeting {
private String content;
public Greeting() {
}
public Greeting(String content) {
this.content = content;
}
public String getContent() {
return content;
}
}
```
## GreetingController Class
GreetingController.java
```
package com.example.messagingstompwebsocket;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;
import org.springframework.web.util.HtmlUtils;
@Controller
public class GreetingController {
@MessageMapping("/hello")
@SendTo("/topic/greetings")
public Greeting greeting(HelloMessage message) throws Exception {
Thread.sleep(1000); // simulated delay
return new Greeting("Hello, " + HtmlUtils.htmlEscape(message.getName()) + "!");
}
}
```
## WebSocketConfig Class
WebSocketConfig.java
```
package com.example.messagingstompwebsocket;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/app");
}
@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/gs-guide-websocket").withSockJS();
}
}
```
## Index.html
src/main/resources/static/index.html
```
<!DOCTYPE html>
<html>
<head>
<title>Hello WebSocket</title>
<link href="/webjars/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<link href="/main.css" rel="stylesheet">
<script src="/webjars/jquery/jquery.min.js"></script>
<script src="/webjars/sockjs-client/sockjs.min.js"></script>
<script src="/webjars/stomp-websocket/stomp.min.js"></script>
<script src="/app.js"></script>
</head>
<body>
<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websocket relies on Javascript being
enabled. Please enable
Javascript and reload this page!</h2></noscript>
<div id="main-content" class="container">
<div class="row">
<div class="col-md-6">
<form class="form-inline">
<div class="form-group">
<label for="connect">WebSocket connection:</label>
<button id="connect" class="btn btn-default" type="submit">Connect</button>
<button id="disconnect" class="btn btn-default" type="submit" disabled="disabled">Disconnect
</button>
</div>
</form>
</div>
<div class="col-md-6">
<form class="form-inline">
<div class="form-group">
<label for="name">What is your name?</label>
<input type="text" id="name" class="form-control" placeholder="Your name here...">
</div>
<button id="send" class="btn btn-default" type="submit">Send</button>
</form>
</div>
</div>
<div class="row">
<div class="col-md-12">
<table id="conversation" class="table table-striped">
<thead>
<tr>
<th>Greetings</th>
</tr>
</thead>
<tbody id="greetings">
</tbody>
</table>
</div>
</div>
</div>
</body>
</html>
```
## app.js
src/main/resources/static/app.html
```
var stompClient = null;
function setConnected(connected) {
$("#connect").prop("disabled", connected);
$("#disconnect").prop("disabled", !connected);
if (connected) {
$("#conversation").show();
}
else {
$("#conversation").hide();
}
$("#greetings").html("");
}
function connect() {
var socket = new SockJS('/gs-guide-websocket');
stompClient = Stomp.over(socket);
stompClient.connect({}, function (frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe('/topic/greetings', function (greeting) {
showGreeting(JSON.parse(greeting.body).content);
});
});
}
function disconnect() {
if (stompClient !== null) {
stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}
function sendName() {
stompClient.send("/app/hello", {}, JSON.stringify({'name': $("#name").val()}));
}
function showGreeting(message) {
$("#greetings").append("| " + message + " |
");
}
$(function () {
$("form").on('submit', function (e) {
e.preventDefault();
});
$( "#connect" ).click(function() { connect(); });
$( "#disconnect" ).click(function() { disconnect(); });
$( "#send" ).click(function() { sendName(); });
});
```