浅谈React-router v6 实现登录验证流程

此示例演示了一个包含三个页面的简单登录流程：公共页面、受保护页面和登录页面。 为了查看受保护的页面，你必须先登录。
首先，访问公共页面。 然后，访问受保护的页面。 你尚未登录，因此你将被重定向到登录页面。 登录后，你将被重定向回受保护的页面。

封装 context 包裹容器

首先封装authprovider组件，利用context特性共享那些对于一个组件树而言是“全局”的数据。
全局定义user、signin、signout数据和方法，signin、signout使用了高阶函数，也方便后续扩展和修改。

context主要应用场景在于很多不同层级的组件需要访问同样一些的数据。请谨慎使用，因为这会使得组件的复用性变差。
如果你只是想避免层层传递一些属性，组件组合（component composition）有时候是一个比 context更好的解决方案。

import { reactnode, createcontext, usestate } from "react";

export interface authcontexttype {
  user: any;
  signin: (user: string, callback: voidfunction) => void;
  signout: (callback: voidfunction) => void;
}

export let authcontext = createcontext<authcontexttype | null>(null);

const fakeauthprovider = {
  isauthenticated: false,
  signin(callback: voidfunction) {
    this.isauthenticated = true;
    settimeout(callback, 100);
  },
  signout(callback: voidfunction) {
    this.isauthenticated = false;
    settimeout(callback, 100);
  },
};

const authprovider = ({ children }: { children: reactnode }) => {
  const [user, setuser] = usestate<any>(null);

  let signin = (newuser: string, callback: voidfunction) => {
    return fakeauthprovider.signin(() => {
      setuser(newuser);
      callback();
    });
  };

  let signout = (callback: voidfunction) => {
    return fakeauthprovider.signout(() => {
      setuser(null);
      callback();
    });
  };

  return (
    <authcontext.provider value={{ user, signin, signout }}>
      {children}
    </authcontext.provider>
  );
};

export default authprovider;

封装 layout 父级容器

layout组件主要是针对登录状态进行校验，然后做相应处理。利用react-router v6中<outlet />组件显示嵌套路由，相比于v5版本v6实现嵌套路由更加方便，省略了很多冗余的判断代码。

import { usecontext } from "react";
import { usenavigate, link, outlet } from "react-router-dom";
import { authcontext, authcontexttype } from "../authprovider";

const useauth = () => usecontext(authcontext);

const authstatus = () => {
  let auth = useauth();
  let { user, signout } = auth as authcontexttype;
  let navigate = usenavigate();

  if (!user) return <p>没有登录</p>;
  return (
    <>
      <p>你好 {user}! </p>
      <button onclick={() => signout(() => navigate("/"))}>退出</button>
    </>
  );
};

const layout = () => {
  return (
    <div>
      <authstatus />
      <ul>
        <li>
          <link to="/">公共页面</link>
        </li>
        <li>
          <link to="/protected">受保护页面</link>
        </li>
      </ul>
      <outlet />
    </div>
  );
};

export default layout;

开发 login 模块

import { usecontext, formevent } from "react";
import { usenavigate, uselocation, location } from "react-router-dom";
import { authcontext, authcontexttype } from "../authprovider";

interface state extends omit<location, "state"> {
  state: {
    from: {
      pathname: string;
    };
  };
}

const useauth = () => usecontext(authcontext);

const login = () => {
  let auth = useauth();
  let { signin } = auth as authcontexttype;
  const { state } = uselocation() as state;
  let from = state.from.pathname || "/";
  let navigate = usenavigate();

  const handlesubmit = (event: formevent<htmlformelement>) => {
    event.preventdefault();

    let formdata = new formdata(event.currenttarget);
    let username = formdata.get("username") as string;

    signin(username, () => navigate(from, { replace: true }));
  };

  return (
    <div>
      <p>您必须登录才能查看该页面 {from}</p>

      <form onsubmit={handlesubmit}>
        <label>
          用户名: <input name="username" type="text" />
        </label>
        <button type="submit">登录</button>
      </form>
    </div>
  );
};

export default login;

开发 protected 包裹容器

主要就是对登录状态进行校验，成功则渲染子组件，否则跳转回登录页面

import { usecontext } from "react";
import { uselocation, navigate } from "react-router-dom";
import { authcontext, authcontexttype } from "../authprovider";

const useauth = () => usecontext(authcontext);

const requireauth = ({ children }: { children: jsx.element }) => {
  let auth = useauth();
  let { user } = auth as authcontexttype;
  let location = uselocation();

  if (!user) return <navigate to="/login" state={{ from: location }} replace />;

  return children;
};

export default requireauth;

app 入口文件

入口文件没有对路由进行懒加载优化，因为是小应用，所以实际开发还是要考虑性能优化的。

import { routes, route } from "react-router-dom";

import authprovider from "src/views/authprovider";
import layout from "src/views/auth/layout";
import loginpage from "src/views/auth/login";
import publicpage from "src/views/auth/publicpage";
import requireauth from "src/views/auth/requireauth";
import protectedpage from "src/views/auth/protectedpage";

const app = () => {
  return (
    <authprovider>
      <routes>
        <route element={<layout />}>
          <route path="/" element={<publicpage />} />
          <route path="/login" element={<loginpage />} />
          <route
            path="/protected"
            element={
              <requireauth>
                <protectedpage />
              </requireauth>
            }
          />
        </route>
      </routes>
    </authprovider>
  );
};

export default app;

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