Check if Logged in - React Router App ES6

Question

I am writing a React.js application (v15.3) using react-router (v2.8.1) and ES6 syntax. I cannot get the router code to intercept all transitions between pages to check if the user needs to login first.

My top level render method is very simple (the app is trivial as well):

 render()
   {
      return (
         <Router history={hashHistory}>
            <Route path="/" component={AppMain}>
               <Route path="login" component={Login}/>
               <Route path="logout" component={Logout}/>
               <Route path="subject" component={SubjectPanel}/>
               <Route path="all" component={NotesPanel}/>
            </Route>
         </Router>
      );
   }

All the samples on the web use ES5 code or older versions of react-router (older than version 2), and my various attempts with mixins (deprecated) and willTransitionTo (never gets called) have failed.

How can I set up a global 'interceptor function' to force users to authenticate before landing on the page they request?

Answer 1

Every route has an onEnter hook which is called before the route transition happens. Handle the onEnter hook with a custom requireAuth function.

<Route path="/search" component={Search} onEnter={requireAuth} /> 

A sample requireAuth is shown below. If the user is authenticated, transition via next(). Else replace the pathname with /login and transition via next(). The login is also passed the current pathname so that after login completes, the user is redirected to the path originally requested for.

function requireAuth(nextState, replace, next) {   if (!authenticated) {     replace({       pathname: "/login",       state: {nextPathname: nextState.location.pathname}     });   }   next(); } 

Answer 2

In v4 you just create a route component that checks if uses is authenticated and return the next components and of course next component can be other routes.

import React, { Component } from 'react';
import PropTypes from 'prop-types';

import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
import { Route, Redirect } from 'react-router-dom';

import AuthMiddleware from 'modules/middlewares/AuthMiddleware';

class PrivateRoute extends Component {
  static propTypes = {
    component: PropTypes.func.isRequired,
    isAuthenticated: PropTypes.bool,
    isLoggedIn: PropTypes.func.isRequired,
    isError: PropTypes.bool.isRequired
  };

  static defaultProps = {
    isAuthenticated: false
  };

  constructor(props) {
    super(props);
    if (!props.isAuthenticated) {
      setTimeout(() => {
        props.isLoggedIn();
      }, 5);
    }
  }

  componentWillMount() {
    if (this.props.isAuthenticated) {
      console.log('authenticated');
    } else {
      console.log('not authenticated');
    }
  }
  componentWillUnmount() {}

  render() {
    const { isAuthenticated, component, isError, ...rest } = this.props;
    if (isAuthenticated !== null) {
      return (
        <Route
          {...rest}
          render={props => (
            isAuthenticated ? (
              React.createElement(component, props)
            ) : (
              <Redirect
                to={{
                  pathname: isError ? '/login' : '/welcome',
                  state: { from: props.location }
                }}
              />
            )
          )}
        />
      );
    } return null;
  }

}

const mapStateToProps = (state) => {
  return {
    isAuthenticated: state.auth.isAuthenticated,
    isError: state.auth.isError
  };
};

const mapDispatchToProps = (dispatch) => {
  return bindActionCreators({
    isLoggedIn: () => AuthMiddleware.isLoggedIn()
  }, dispatch);
};

export default connect(mapStateToProps, mapDispatchToProps)(PrivateRoute);