从通过 React Router 设置的路由访问 Redux Store

Question

我想利用 react-router 的 onEnter 处理程序来提示用户在进入受限路由时进行身份验证。

到目前为止，我的 routes.js 文件看起来像这样：

import React from 'react';
import { Route, IndexRoute } from 'react-router';

export default (
    <Route   path="/"         component={App}>
      <IndexRoute             component={Landing} />
      <Route path="learn"     component={Learn} />
      <Route path="about"     component={About} />
      <Route path="downloads" component={Downloads} onEnter={requireAuth} />
    </Route>
)

理想情况下，我希望我的 requireAuth 函数是一个可以访问存储和当前状态的 redux 操作，其工作方式如下：store.dispatch(requireAuth())。

很遗憾，我无权访问此文件中的商店。在这种情况下，我认为我不能真正使用 connect 来访问我想要的相关操作。我也不能只从创建商店的文件中import store，因为这在应用程序首次加载时是未定义的。

Answer 1

完成此操作的最简单方法是将您的商店传递给返回您的路线的函数（而不是直接返回您的路线）。这样你就可以在onEnter和其他react路由方法中访问store了。

所以对于你的路线：

import React from 'react';
import { Route, IndexRoute } from 'react-router';

export const getRoutes = (store) => (
  const authRequired = (nextState, replaceState) => {
    // Now you can access the store object here.
    const state = store.getState();

    if (!state.user.isAuthenticated) {
      // Not authenticated, redirect to login.
      replaceState({ nextPathname: nextState.location.pathname }, '/login');
    }
  };

  return (
    <Route   path="/"         component={App}>
      <IndexRoute             component={Landing} />
      <Route path="learn"     component={Learn} />
      <Route path="about"     component={About} />
      <Route path="downloads" component={Downloads} onEnter={authRequired} />
    </Route>
  );
)

然后更新你的主组件调用getRoutes函数，传入store：

<Provider store={ store }>
  <Router history={ history }>
    { getRoutes(store) }
  </Router>
</Provider>

至于从requireAuth 调度一个动作，你可以这样写你的函数：

const authRequired = (nextState, replaceState, callback) => {
  store.dispatch(requireAuth())  // Assume this action returns a promise
    .then(() => {
      const state = store.getState();

      if (!state.user.isAuthenticated) {
        // Not authenticated, redirect to login.
        replaceState({ nextPathname: nextState.location.pathname }, '/login');
      }

      // All ok
      callback();
    });
};

希望这会有所帮助。

Answer 2

如果你愿意，你可以这样写 route.js：

var requireAuth = (store, nextState, replace) => {
  console.log("store: ", store);
  //now you have access to the store in the onEnter hook!
}

export default (store) => {
  return (
      <Route path="/"           component={App}>
        <IndexRoute             component={Landing} />
        <Route path="learn"     component={Learn} />
        <Route path="about"     component={About} />
        <Route path="downloads" component={Downloads} onEnter={requireAuth.bind(this, store)} />
      </Route>
    );
);

我已经设置了一个示例，您可以在 codepen 中使用它。

不确定触发操作以处理身份验证是否是个好主意。我个人更喜欢以不同的方式处理身份验证：

我没有使用onEnter 钩子，而是使用了一个包装函数。我希望我的博客的管理部分受到保护，因此我将 AdminContainer 组件包装在带有函数 requireAuthentication 的路由中，见下文。

export default (store, history) => {
        return (
            <Router history={history}>
                <Route path="/" component={App}>
                    { /* Home (main) route */ }
                    <IndexRoute component={HomeContainer}/>
                    <Route path="post/:slug" component={PostPage}/>
                    { /* <Route path="*" component={NotFound} status={404} /> */ }
                </Route>

                <Route path="/admin" component={requireAuthentication(AdminContainer)}>
                    <IndexRoute component={PostList}/>
                    <Route path=":slug/edit" component={PostEditor}/>
                    <Route path="add" component={PostEditor}/>
                </Route>
                <Route path="/login" component={Login}/>
            </Router>
        );
    };

requireAuthentication 是一个函数，

• 如果用户通过身份验证，则呈现包装的组件，
• 否则重定向到Login

你可以在下面看到它：

export default function requireAuthentication(Component) {
    class AuthenticatedComponent extends React.Component {

        componentWillMount () {
            this.checkAuth();
        }

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

        checkAuth () {
            if (!this.props.isAuthenticated) {
                let redirectAfterLogin = this.props.location.pathname;
                this.context.router.replace({pathname: '/login', state: {redirectAfterLogin: redirectAfterLogin}});
            }
        }

        render () {
            return (
                <div>
                    {this.props.isAuthenticated === true
                        ? <Component {...this.props}/>
                        : null
                    }
                </div>
            )

        }
    }

    const mapStateToProps = (state) => ({
        isAuthenticated: state.blog.get('isAuthenticated')
    });

    AuthenticatedComponent.contextTypes = {
        router: React.PropTypes.object.isRequired
    };

    return connect(mapStateToProps)(AuthenticatedComponent);
}

另外，requireAuthentication 将保护/admin 下的所有路由。而且你可以在任何你喜欢的地方重复使用它。

Answer 3

随着时间的推移，很多东西都发生了变化。 onEnter 不再存在于react-router-4

以下来自我的真实项目，供大家参考

export const getRoutes = (store) => {
  const PrivateRoute = ({ component: Component, ...rest }) => (
    <Route {...rest} render={props => (
      checkIfAuthed(store) ? (
        <Component {...props}/>
      ) : (
        <Redirect to={{
          pathname: '/login'
        }}/>
      )
    )}/>
  )

  return (
    <Router>
      <div>
        <PrivateRoute exact path="/" component={Home}/>
        <Route path="/login" component={Login} />
      </div>
    </Router>
  )
}

Answer 4

在尝试了上面的一些建议后，我发现使用更新跟踪存储状态的最佳方法是使用 React-Redux 的 useSelector 函数，该函数基本上将功能组件连接到存储。

import * as React from "react";
import {Redirect, Route, Switch} from "react-router";
import {Provider, useSelector} from "react-redux";
import { createBrowserHistory } from "history";

// Your imports
import {IApplicationState,} from "./store/store";
import {Login} from "./routes/login/login.component";
import {getToken} from "./store/helpers/httpHelpers";


function handleRedirect() {
    if(!getToken()) {
        return <Redirect to="/login"/>;
    }
}

const restricted = (Component: _ComponentType, isLoggedIn: boolean) => {
   // Don't redirect here if there is a token in localStorage.
   // This is happening when we are on a restricted route and the user
   // refreshes & the isLoggedIn state hasn't been updated yet.
    return !isLoggedIn ? (
        () => handleRedirect()
    ) : () => <Route component={Component}/>
};

const AuthenticateRoutes = () => {
    const isLoggedIn = useSelector((state: IApplicationState) => state.auth.isLoggedIn);
    return (
        <Switch>
            <Route path="/login" component={Login} />
            <Route path="/downloads" render={restricted(Download, isLoggedIn)} />
        </Switch>
    );
};

export function App() {
    return (
        <Provider store={store}>
            <>
                <Router history={createBrowserHistory()}>
                    <AuthenticateRoutes />
                </Router>
            </>
        </Provider>
    );
}