import React from 'react'
import {connect} from 'react-redux';

function requireAuthentication(Component) {
 // 組件有已登陸的模塊 直接返回 (防止從新渲染)
 if (Component.AuthenticatedComponent) {
 return Component.AuthenticatedComponent
 }

 // 創建驗證組件
 class AuthenticatedComponent extends React.Component {
 static contextTypes = {
 router: React.PropTypes.object.isRequired,
 }

 state = {
 login: true,
 }

 componentWillMount() {
 this.checkAuth();
 }

 componentWillReceiveProps(nextProps) {
 this.checkAuth();
 }

 checkAuth() {

 // 判斷登陸
 const token = this.props.token;
 const login = token ? token.login : null;


 // 未登陸重定向到登陸頁面
 if (!login) {
 let redirect = this.props.location.pathname + this.props.location.search;
 this.context.router.push('/login?message=401&redirect_uri=' + encodeURIComponent(redirect));
 return;
 }

 this.setState({login});
 }

 render() {
 if (this.state.login) {
 return <Component {...this.props}/>
 }
 return ''
 }
 }

 // 不使用 react-redux 的話直接返回
 // Component.AuthenticatedComponent = AuthenticatedComponent
 // return Component.AuthenticatedComponent


 function mapStateToProps(state) {
 return {
 token: state.token,
 };
 }

 function mapDispatchToProps(dispatch) {
 return {};
 }
 Component.AuthenticatedComponent = connect(mapStateToProps, mapDispatchToProps)(AuthenticatedComponent);
 return Component.AuthenticatedComponent
}

<Router history={browserHistory}>
 <Route path="/admin" component={requireAuthentication(AdminComponent)} />
</Router>