CODEWITHSUNDEEP
javascriptreactjsfirebasereact-routerfirebase-authentication
Hyrule
Hyrule

Reputation: 645

Why Firebase user is not authenticated anymore when refreshing?

A very simple App. At the / path I want to render Home when logged in and Introduction if not signed in. Logging in on the Login page works, if i console.log(firebase.auth().currentUser) it shows all the data and on / it renders Home correctly. So, while still being at the / path, something weird happens; when i refresh page we are not logged in anymore and it renders Introduction. But when I click on the link <li><Link to='/'>Home</Link></li> the Home component renders correctly and we are logged in again. Why is this happening?

import React, { Component } from 'react';
import {BrowserRouter as Router, Route, Switch, Link, Redirect} from 'react-router-dom';
import firebase from './firebase'

import Home from './containers/home'
import Login from './containers/login'
import Register from './containers/register'
import Dashboard from './containers/dashboard'

const Protected = ({component: Component, ...rest}) => (
  <Route {...rest} render={(props) => {
    if(firebase.auth().currentUser) 
      return <Component {...props} />
     else 
      return <Redirect to='/register' />

  }} />
)

const Introduction = props => ( <h1>hello</h1>)

class App extends Component {


  render() {
    return (
      <Router>
        <React.Fragment>
          <ul>
            <li><Link to='/'>Home</Link></li>
            <li><Link to='/register'>Register</Link></li>
            <li><Link to='/login'>login</Link></li>
            <li><Link to='/dashboard'>dashboard</Link></li>
          </ul>
          <Switch>
            <Route path='/' exact render={(props) => {
              if(firebase.auth().currentUser) 
                return <Home {...props} />
              else
                return <Introduction {...props} />
              }
            } />
            <Route path='/register' exact component={Register} />
            <Route path='/login' component={Login} />
            <Protected path='/dashboard' component={Dashboard} />
          </Switch>
        </React.Fragment>
      </Router>
    );
  }
}

export default App;

Upvotes: 1

Views: 1009

Answers (1)

kingdaro
kingdaro

Reputation: 12028

Here's what happens:

  • Webpage loads
  • Firebase starts a request to check whether the user is authenticated
  • The app renders, currentUser is null
  • The authentication state changes, but the app doesn't re-render

The app needs to listen to changes in the authentication state and perform a re-render accordingly. https://firebase.google.com/docs/reference/js/firebase.auth.Auth#onAuthStateChanged

class App extends React.Component {
  state = {
    currentUser: null
  }

  componentDidMount() {
    this.unsubscribe = firebase.auth().onAuthStateChanged(currentUser => {
      this.setState({ currentUser })
    })
  }

  componentWillUnmount() {
    this.unsubscribe()
  }

  render() {
    // use this.state.currentUser
  }
}

Upvotes: 1

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