Login.js

import React from 'react';
import { RedirectIfLoggedIn } from '../common/auth';
import ReactAbstractComponent from '../lib/ReactAbstractComponent';


class Login extends ReactAbstractComponent {
    handleLoginSubmitted = (user) => {
        const {login} = this.context.actions;

        login(user);
    }

    render() {
        // ... some content
    }
};


export default RedirectIfLoggedIn(Login);

RedirectIfLoggedIn.js

import React, {PropTypes} from 'react';


const RedirectIfLoggedIn = (Component) => class extends ReactAbstractComponent {
    checkCurrentUser = () => {
        const currentUser = this.getCurrentUser();
        if (currentUser) this.context.router.transitionTo('/');
    }

    componentWillMount() {
        this.checkCurrentUser();
    }

    componentWillUpdate() {
        this.checkCurrentUser();
    }

    render() {
        return <Component {...this.props} {...this.state}/>;
    }
};



export default RedirectIfLoggedIn;