adding react firebase example

CodeExamples/Week5/React-Firebase-Auth/.gitignore

+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

CodeExamples/Week5/React-Firebase-Auth/README.md

+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.<br />
+Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
+
+The page will reload if you make edits.<br />
+You will also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.<br />
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.<br />
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.<br />
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can’t go back!**
+
+If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
+
+You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting
+
+### Analyzing the Bundle Size
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size
+
+### Making a Progressive Web App
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app
+
+### Advanced Configuration
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration
+
+### Deployment
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/deployment
+
+### `npm run build` fails to minify
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify

CodeExamples/Week5/React-Firebase-Auth/package.json

+{
+  "name": "firebase-react-auth",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^4.2.4",
+    "@testing-library/react": "^9.5.0",
+    "@testing-library/user-event": "^7.2.1",
+    "bootstrap": "^4.5.2",
+    "firebase": "^7.20.0",
+    "react": "^16.13.1",
+    "react-bootstrap": "^1.3.0",
+    "react-dom": "^16.13.1",
+    "react-router-dom": "^5.2.0",
+    "react-scripts": "3.4.3"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}

CodeExamples/Week5/React-Firebase-Auth/public/index.html

+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

CodeExamples/Week5/React-Firebase-Auth/public/manifest.json

+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

CodeExamples/Week5/React-Firebase-Auth/public/robots.txt

+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

CodeExamples/Week5/React-Firebase-Auth/src/components/App.js

+import React from "react"
+import Signup from "./Signup"
+import { Container } from "react-bootstrap"
+import { AuthProvider } from "../contexts/AuthContext"
+import { BrowserRouter as Router, Switch, Route } from "react-router-dom"
+import Dashboard from "./Dashboard"
+import Login from "./Login"
+import PrivateRoute from "./PrivateRoute"
+import ForgotPassword from "./ForgotPassword"
+import UpdateProfile from "./UpdateProfile"
+
+function App() {
+  return (
+    <Container
+      className="d-flex align-items-center justify-content-center"
+      style={{ minHeight: "100vh" }}
+    >
+      <div className="w-100" style={{ maxWidth: "400px" }}>
+        <Router>
+          <AuthProvider>
+            <Switch>
+              <PrivateRoute exact path="/" component={Dashboard} />
+              <PrivateRoute path="/update-profile" component={UpdateProfile} />
+              <Route path="/signup" component={Signup} />
+              <Route path="/login" component={Login} />
+              <Route path="/forgot-password" component={ForgotPassword} />
+            </Switch>
+          </AuthProvider>
+        </Router>
+      </div>
+    </Container>
+  )
+}
+
+export default App

CodeExamples/Week5/React-Firebase-Auth/src/components/Dashboard.js

+import React, { useState } from "react"
+import { Card, Button, Alert } from "react-bootstrap"
+import { useAuth } from "../contexts/AuthContext"
+import { Link, useHistory } from "react-router-dom"
+
+export default function Dashboard() {
+  const [error, setError] = useState("")
+  const { currentUser, logout } = useAuth()
+  const history = useHistory()
+
+  async function handleLogout() {
+    setError("")
+
+    try {
+      await logout()
+      history.push("/login")
+    } catch {
+      setError("Failed to log out")
+    }
+  }
+
+  return (
+    <>
+      <Card>
+        <Card.Body>
+          <h2 className="text-center mb-4">Profile</h2>
+          {error && <Alert variant="danger">{error}</Alert>}
+          <strong>Email:</strong> {currentUser.email}
+          <Link to="/update-profile" className="btn btn-primary w-100 mt-3">
+            Update Profile
+          </Link>
+        </Card.Body>
+      </Card>
+      <div className="w-100 text-center mt-2">
+        <Button variant="link" onClick={handleLogout}>
+          Log Out
+        </Button>
+      </div>
+    </>
+  )
+}

CodeExamples/Week5/React-Firebase-Auth/src/components/ForgotPassword.js

+import React, { useRef, useState } from "react"
+import { Form, Button, Card, Alert } from "react-bootstrap"
+import { useAuth } from "../contexts/AuthContext"
+import { Link } from "react-router-dom"
+
+export default function ForgotPassword() {
+  const emailRef = useRef()
+  const { resetPassword } = useAuth()
+  const [error, setError] = useState("")
+  const [message, setMessage] = useState("")
+  const [loading, setLoading] = useState(false)
+
+  async function handleSubmit(e) {
+    e.preventDefault()
+
+    try {
+      setMessage("")
+      setError("")
+      setLoading(true)
+      await resetPassword(emailRef.current.value)
+      setMessage("Check your inbox for further instructions")
+    } catch {
+      setError("Failed to reset password")
+    }
+
+    setLoading(false)
+  }
+
+  return (
+    <>
+      <Card>
+        <Card.Body>
+          <h2 className="text-center mb-4">Password Reset</h2>
+          {error && <Alert variant="danger">{error}</Alert>}
+          {message && <Alert variant="success">{message}</Alert>}
+          <Form onSubmit={handleSubmit}>
+            <Form.Group id="email">
+              <Form.Label>Email</Form.Label>
+              <Form.Control type="email" ref={emailRef} required />
+            </Form.Group>
+            <Button disabled={loading} className="w-100" type="submit">
+              Reset Password
+            </Button>
+          </Form>
+          <div className="w-100 text-center mt-3">
+            <Link to="/login">Login</Link>
+          </div>
+        </Card.Body>
+      </Card>
+      <div className="w-100 text-center mt-2">
+        Need an account? <Link to="/signup">Sign Up</Link>
+      </div>
+    </>
+  )
+}

CodeExamples/Week5/React-Firebase-Auth/src/components/Login.js

+import React, { useRef, useState } from "react"
+import { Form, Button, Card, Alert } from "react-bootstrap"
+import { useAuth } from "../contexts/AuthContext"
+import { Link, useHistory } from "react-router-dom"
+
+export default function Login() {
+  const emailRef = useRef()
+  const passwordRef = useRef()
+  const { login } = useAuth()
+  const [error, setError] = useState("")
+  const [loading, setLoading] = useState(false)
+  const history = useHistory()
+
+  async function handleSubmit(e) {
+    e.preventDefault()
+
+    try {
+      setError("")
+      setLoading(true)
+      await login(emailRef.current.value, passwordRef.current.value)
+      history.push("/")
+    } catch {
+      setError("Failed to log in")
+    }
+
+    setLoading(false)
+  }
+
+  return (
+    <>
+      <Card>
+        <Card.Body>
+          <h2 className="text-center mb-4">Log In</h2>
+          {error && <Alert variant="danger">{error}</Alert>}
+          <Form onSubmit={handleSubmit}>
+            <Form.Group id="email">
+              <Form.Label>Email</Form.Label>
+              <Form.Control type="email" ref={emailRef} required />
+            </Form.Group>
+            <Form.Group id="password">
+              <Form.Label>Password</Form.Label>
+              <Form.Control type="password" ref={passwordRef} required />
+            </Form.Group>
+            <Button disabled={loading} className="w-100" type="submit">
+              Log In
+            </Button>
+          </Form>
+          <div className="w-100 text-center mt-3">
+            <Link to="/forgot-password">Forgot Password?</Link>
+          </div>
+        </Card.Body>
+      </Card>
+      <div className="w-100 text-center mt-2">
+        Need an account? <Link to="/signup">Sign Up</Link>
+      </div>
+    </>
+  )
+}

CodeExamples/Week5/React-Firebase-Auth/src/components/PrivateRoute.js

+import React from "react"
+import { Route, Redirect } from "react-router-dom"
+import { useAuth } from "../contexts/AuthContext"
+
+export default function PrivateRoute({ component: Component, ...rest }) {
+  const { currentUser } = useAuth()
+
+  return (
+    <Route
+      {...rest}
+      render={props => {
+        return currentUser ? <Component {...props} /> : <Redirect to="/login" />
+      }}
+    ></Route>
+  )
+}

CodeExamples/Week5/React-Firebase-Auth/src/components/Signup.js

+import React, { useRef, useState } from "react"
+import { Form, Button, Card, Alert } from "react-bootstrap"
+import { useAuth } from "../contexts/AuthContext"
+import { Link, useHistory } from "react-router-dom"
+
+export default function Signup() {
+  const emailRef = useRef()
+  const passwordRef = useRef()
+  const passwordConfirmRef = useRef()
+  const { signup } = useAuth()
+  const [error, setError] = useState("")
+  const [loading, setLoading] = useState(false)
+  const history = useHistory()
+
+  async function handleSubmit(e) {
+    e.preventDefault()
+
+    if (passwordRef.current.value !== passwordConfirmRef.current.value) {
+      return setError("Passwords do not match")
+    }
+
+    try {
+      setError("")
+      setLoading(true)
+      await signup(emailRef.current.value, passwordRef.current.value)
+      history.push("/")
+    } catch {
+      setError("Failed to create an account")
+    }
+
+    setLoading(false)
+  }
+
+  return (
+    <>
+      <Card>
+        <Card.Body>
+          <h2 className="text-center mb-4">Sign Up</h2>
+          {error && <Alert variant="danger">{error}</Alert>}
+          <Form onSubmit={handleSubmit}>
+            <Form.Group id="email">
+              <Form.Label>Email</Form.Label>
+              <Form.Control type="email" ref={emailRef} required />
+            </Form.Group>
+            <Form.Group id="password">
+              <Form.Label>Password</Form.Label>
+              <Form.Control type="password" ref={passwordRef} required />
+            </Form.Group>
+            <Form.Group id="password-confirm">
+              <Form.Label>Password Confirmation</Form.Label>
+              <Form.Control type="password" ref={passwordConfirmRef} required />
+            </Form.Group>
+            <Button disabled={loading} className="w-100" type="submit">
+              Sign Up
+            </Button>
+          </Form>
+        </Card.Body>
+      </Card>
+      <div className="w-100 text-center mt-2">
+        Already have an account? <Link to="/login">Log In</Link>
+      </div>
+    </>
+  )
+}

CodeExamples/Week5/React-Firebase-Auth/src/components/UpdateProfile.js

+import React, { useRef, useState } from "react"
+import { Form, Button, Card, Alert } from "react-bootstrap"
+import { useAuth } from "../contexts/AuthContext"
+import { Link, useHistory } from "react-router-dom"
+
+export default function UpdateProfile() {
+  const emailRef = useRef()
+  const passwordRef = useRef()
+  const passwordConfirmRef = useRef()
+  const { currentUser, updatePassword, updateEmail } = useAuth()
+  const [error, setError] = useState("")
+  const [loading, setLoading] = useState(false)
+  const history = useHistory()
+
+  function handleSubmit(e) {
+    e.preventDefault()
+    if (passwordRef.current.value !== passwordConfirmRef.current.value) {
+      return setError("Passwords do not match")
+    }
+
+    const promises = []
+    setLoading(true)
+    setError("")
+
+    if (emailRef.current.value !== currentUser.email) {
+      promises.push(updateEmail(emailRef.current.value))
+    }
+    if (passwordRef.current.value) {
+      promises.push(updatePassword(passwordRef.current.value))
+    }
+
+    Promise.all(promises)
+      .then(() => {
+        history.push("/")
+      })
+      .catch(() => {
+        setError("Failed to update account")
+      })
+      .finally(() => {
+        setLoading(false)
+      })
+  }
+
+  return (
+    <>
+      <Card>
+        <Card.Body>
+          <h2 className="text-center mb-4">Update Profile</h2>
+          {error && <Alert variant="danger">{error}</Alert>}
+          <Form onSubmit={handleSubmit}>
+            <Form.Group id="email">
+              <Form.Label>Email</Form.Label>
+              <Form.Control
+                type="email"
+                ref={emailRef}
+                required
+                defaultValue={currentUser.email}
+              />
+            </Form.Group>
+            <Form.Group id="password">
+              <Form.Label>Password</Form.Label>
+              <Form.Control
+                type="password"
+                ref={passwordRef}
+                placeholder="Leave blank to keep the same"
+              />
+            </Form.Group>
+            <Form.Group id="password-confirm">
+              <Form.Label>Password Confirmation</Form.Label>
+              <Form.Control
+                type="password"
+                ref={passwordConfirmRef}
+                placeholder="Leave blank to keep the same"
+              />
+            </Form.Group>
+            <Button disabled={loading} className="w-100" type="submit">
+              Update
+            </Button>
+          </Form>
+        </Card.Body>
+      </Card>
+      <div className="w-100 text-center mt-2">
+        <Link to="/">Cancel</Link>
+      </div>
+    </>
+  )
+}

CodeExamples/Week5/React-Firebase-Auth/src/contexts/AuthContext.js

+import React, { useContext, useState, useEffect } from "react"
+import { auth } from "../firebase"
+
+const AuthContext = React.createContext()
+
+export function useAuth() {
+  return useContext(AuthContext)
+}
+
+export function AuthProvider({ children }) {
+  const [currentUser, setCurrentUser] = useState()
+  const [loading, setLoading] = useState(true)
+
+  function signup(email, password) {
+    return auth.createUserWithEmailAndPassword(email, password)
+  }
+
+  function login(email, password) {
+    return auth.signInWithEmailAndPassword(email, password)
+  }
+
+  function logout() {
+    return auth.signOut()
+  }
+
+  function resetPassword(email) {
+    return auth.sendPasswordResetEmail(email)
+  }
+
+  function updateEmail(email) {
+    return currentUser.updateEmail(email)
+  }
+
+  function updatePassword(password) {
+    return currentUser.updatePassword(password)
+  }
+
+  useEffect(() => {
+    const unsubscribe = auth.onAuthStateChanged(user => {
+      setCurrentUser(user)
+      setLoading(false)
+    })
+
+    return unsubscribe
+  }, [])
+
+  const value = {
+    currentUser,
+    login,
+    signup,
+    logout,
+    resetPassword,
+    updateEmail,
+    updatePassword
+  }
+
+  return (
+    <AuthContext.Provider value={value}>
+      {!loading && children}
+    </AuthContext.Provider>
+  )
+}

CodeExamples/Week5/React-Firebase-Auth/src/firebase.js

+import firebase from "firebase/app"
+import "firebase/auth"
+
+const app = firebase.initializeApp({
+  apiKey: process.env.REACT_APP_FIREBASE_API_KEY,
+  authDomain: process.env.REACT_APP_FIREBASE_AUTH_DOMAIN,
+  projectId: process.env.REACT_APP_FIREBASE_PROJECT_ID,
+  storageBucket: process.env.REACT_APP_FIREBASE_STORAGE_BUCKET,
+  messagingSenderId: process.env.REACT_APP_FIREBASE_MESSAGING_SENDER_ID,
+  appId: process.env.REACT_APP_FIREBASE_APP_ID
+})
+
+export const auth = app.auth()
+export default app

CodeExamples/Week5/React-Firebase-Auth/src/index.js

+import React from "react"
+import ReactDOM from "react-dom"
+import App from "./components/App"
+import "bootstrap/dist/css/bootstrap.min.css"
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+  document.getElementById("root")
+)