How to Manage Authentication in React Router 4?

Managing Authentication in React Router 4

In React Router version 4, the implementation of authenticated routes requires a different approach compared to previous versions.

Original Approach

Previously, you could use multiple Route components with children, but this is now discouraged.

<Route exact path="/&quot; component={Index} />
<Route path="/auth" component={UnauthenticatedWrapper}>
    <Route path="/auth/login" component={LoginBotBot} />
</Route>
<Route path="/domains" component={AuthenticatedWrapper}>
    <Route exact path="/domains" component={DomainsIndex} />
</Route>

Correct Implementation

To implement authenticated routes, one option is to use a custom component that extends Route and checks for authentication before rendering the component.

import React, {PropTypes} from "react";
import {Route} from "react-router-dom";

export default class AuthenticatedRoute extends React.Component {
  render() {
    if (!this.props.isLoggedIn) {
      this.props.redirectToLogin()
      return null
    }
    return <Route {...this.props} />
  }
}

AuthenticatedRoute.propTypes = {
  isLoggedIn: PropTypes.bool.isRequired,
  component: PropTypes.element,
  redirectToLogin: PropTypes.func.isRequired
}

Alternative Approach

Another approach is to use the Redirect component, which allows you to redirect users based on an authed property.

function PrivateRoute ({component: Component, authed, ...rest}) {
  return (
    <Route
      {...rest}
      render={(props) => authed === true
        ? <Component {...props} />
        : <Redirect to={{pathname: '/login', state: {from: props.location}}} />}
    />
  )
}

You can then use the PrivateRoute component in your routes:

<Route path='/' exact component={Home} />
<Route path='/login' component={Login} />
<Route path='/register' component={Register} />
<PrivateRoute authed={this.state.authed} path='/dashboard' component={Dashboard} />

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