vue2模擬vue-element-admin手寫角色許可權的實現

//地址：store/modules/permission
import { routes as constantRoutes } from '@/router'
​
// 根據meta.roles去判斷該角色是否有路由許可權
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return route.meta.roles.some(val => val === roles)
  }
  return true
}
​
/**
 * 遞迴動態路由
 * @param routes 動態路由
 * @param roles 角色
 */
export function filterAsyncRoutes(routes, roles) {
  const res = []
  routes.forEach(route => {
    const tmp = { ...route }
    if (hasPermission(roles, tmp)) {
      if (tmp.children) {
        //後臺傳來的路由字串，轉換為元件物件
        //       let a = `../views/${route.component}`;
        //       route.component = () => import(a); // 匯入元件
        tmp.children = filterAsyncRoutes(tmp.children, roles)
      }
      res.push(tmp)
    }
  })
​
  return res
}
​
//模擬後端傳過來的路由
export const asyncRoutes = [
  {
    path: '/',
    name: 'home',
    redirect: '/PickupTask',
    meta: {
      title: '首頁',
      //純前端去做動態路由
      roles: ['admin']
    },
    component: () => import('@/views/HomeView.vue'),
    children: [
      {
        path: 'PickupTask',
        name: 'PickupTask',
        meta: {
          title: 'PickupTask',
        },
        component: () => import('@/views/Sd/PickupTask.vue'),
      },
      {
        path: 'access',
        hidden: true,
        component: () => import('@/views/demo/Access.vue'),
        meta: {
          title: 'access',
          roles: ['admin'],
          //按鈕許可權標識
          button: {
            'btn:access:createUser': 'hidden',
            'btn:access:editUser': 'disable'
          },
        },
      },
    ],
  }
]
​
const permisssion = {
  // namespaced: true, -> store.dispatch('permisssion/generateRoutes', 'admin');
  state: {
    //靜態路由+動態路由
    routes: [],
    //動態路由
    addRoutes: []
  },
  mutations: {
    SET_ROUTES: (state, routes) => {
      state.addRoutes = routes
      state.routes = constantRoutes.concat(routes)
    }
  },
  actions: {
    generateRoutes({ commit }, roles) {
      return new Promise(resolve => {
        let accessedRoutes = filterAsyncRoutes(asyncRoutes, roles)
        commit('SET_ROUTES', accessedRoutes)
        resolve(accessedRoutes)
      })
    }
  }
}
​
export default permisssion

//地址：router/index
import Vue from 'vue';
import VueRouter, { RouteConfig } from 'vue-router';
import store from '@/store';
​
Vue.use(VueRouter);
​
const isProd = process.env.NODE_ENV === 'production';
const routerContext = require.context('./', true, /index.js$/);
//靜態路由
export let routes: any = [];
​
routerContext.keys().forEach((route) => {
  // route就是路徑
  // 如果是根目錄的index不做處理
  if (route.startsWith('./index')) {
    return;
  }
  const routerModule = routerContext(route);
  routes = [...routes, ...(routerModule.default || routerModule)];
});
​
// 建立 router 範例，然後傳 `routes` 設定
const router = new VueRouter({
  mode: 'history',
  base: isProd ? '/vue-demo/' : process.env.BASE_URL,
  routes,
  scrollBehavior(to, from, savedPosition) {
    if (to.hash) {
      return {
        selector: to.hash,
      };
    }
  },
});
​
let registerRouteFresh = true;
/**
 * 全域性全域性前置守衛
 * to : 將要進入的目標路由物件
 * from : 即將離開的目標路由物件
 */
router.beforeEach(async (to: any, from, next) => {
  //設定當前頁的title
  document.title = to.meta.title;
  if (to.path === '/login' && localStorage.getItem('token')) {
    next('/');
  }
  console.log(registerRouteFresh);
  //如果首次或者重新整理介面，next(...to, replace: true)會迴圈遍歷路由，
  //如果to找不到對應的路由那麼他會再執行一次beforeEach((to, from, next))直到找到對應的路由，
  //我們的問題在於頁面重新整理以後非同步獲取資料，直接執行next()感覺路由新增了但是在next()之後執行的，
  //所以我們沒法導航到相應的介面。這裡使用變數registerRouteFresh變數做記錄，直到找到相應的路由以後，把值設定為false然後走else執行next(),整個流程就走完了，路由也就新增完了。
  if (registerRouteFresh) {
    //設定路由
    const accessRoutes = await store.dispatch('generateRoutes', 'admin');
    let errorPage = {
      path: '*',
      name: '404',
      component: () => import('../views/404.vue'),
    };
    // 將404新增進去
    // 現在才新增的原因是：作為一級路由，當重新整理，動態路由還未載入，路由就已經做了匹配，找不到就跳到了404
    router.addRoute({ ...errorPage });
    accessRoutes.forEach((item: RouteConfig) => {
      router.addRoute(item);
    });
    //獲取路由設定
    console.log(router.getRoutes());
    //通過next({...to, replace})解決重新整理後路由失效的問題
    next({ ...to, replace: true });
    registerRouteFresh = false;
  } else {
    next();
  }
  next();
});
​
export default router;

//地址：store/modules/user
import {
  userInfo,
} from '@/api'
​
const user = {
  state: {
    role: 'admin',
    mockButton: {
      'btn:access:createUser': 'show',
      'btn:access:editUser': 'show'
    }
  },
  //更改 Vuex 的 store 中的狀態的唯一方法是提交 mutation
  mutations: {
    change_role: (state, data) => {
      state.role = data.role
    },
    change_btn: (state, data) => {
      state.mockButton = data.mockButton
    }
  },
}
​
export default user

//地址：directive/permission/index
import permission from './permissionBtn'
​
const install = function(Vue) {
  Vue.directive('permission', permission)
}
​
if (window.Vue) {
  window['permission'] = permission
  Vue.use(install); // eslint-disable-line
}
​
permission.install = install
export default permission

//地址：directive/permission/permissionBtn
import store from '@/store'
​
function checkPermission(el, binding) {
  const { value } = binding
  const roles = store.getters && store.getters.role
  // 獲取模擬許可權按鈕標識
  const mockButton = store.getters && store.getters.mockButton
  // 設定按鈕屬性
  if (mockButton[value] === 'disabled') {
    el.disabled = true
    el.setAttribute('disabled', true)
  }
​
  if (mockButton[value] === 'hidden') {
    el.style.display = 'none'
  }
  if (mockButton[value] === 'show') {
    el.style.display = 'block'
    el.disabled = false
  }
  // throw new Error(`need roles! Like v-permission="['admin','editor']"`)
}
​
export default {
  inserted(el, binding) {
    checkPermission(el, binding)
  },
  update(el, binding) {
    checkPermission(el, binding)
  }
}

<template>
  <div>
    <a-button @click="changeRole">切換角色</a-button>
    <span>當前角色：{{ role }}</span>
    <!-- 注意一定要加disabled屬性，才能設定它的disabled值 -->
    <a-button :disabled="false" v-permission="'btn:access:createUser'">
      新建使用者
    </a-button>
    <a-button :disabled="false" v-permission="'btn:access:editUser'">
      編輯使用者
    </a-button>
  </div>
</template>
​
<script lang='ts'>
import { Vue, Component, Watch } from "vue-property-decorator";
import permission from "@/directive/permission/index.js"; // 許可權判斷指令
// import checkPermission from '@/utils/permission' // 許可權判斷函數
@Component({
  directives: {
    permission,
  },
  computed: {
    role() {
      return this.$store.getters.role;
    },
  },
})
export default class Access extends Vue {
  get role() {
    return this.$store.getters.role;
  }
​
  changeRole() {
    //設定按鈕許可權
    this.$store.commit("change_btn", {
      mockButton:
        this.role === "admin"
          ? {
              "btn:access:createUser": "hidden",
              "btn:access:editUser": "disabled",
            }
          : {
              "btn:access:createUser": "show",
              "btn:access:editUser": "show",
            },
    });
    //設定角色
    this.$store.commit("change_role", {
      role: this.role === "admin" ? "edit" : "admin",
    });
  }
}
</script>

/**
 * @param {Array} value
 * @returns {Boolean}
 * @example see @/views/permission/directive.vue
 * 除了使用指令，也可以使用函數
 */
export default function checkPermission(value) {
  if (value && value instanceof Array && value.length > 0) {
    const roles = store.getters && store.getters.roles
    const permissionRoles = value
​
    const hasPermission = roles.some(role => {
      return permissionRoles.includes(role)
    })
    return hasPermission
  }
    console.error(`need roles! Like v-permission="['admin','editor']"`)
    return false
​
}

<template>
  <div>
    <a-button
      v-if="hasPerms('btn:access:createUser')"
      :disable="hasPerms('btn:access:createUser')"
    >
      新建使用者
    </a-button>
    <a-button
      v-if="hasPerms('btn:access:editUser')"
      :disable="hasPerms('btn:access:editUser')"
    >
      編輯使用者
    </a-button>
  </div>
</template>
​
<script lang='ts'>
import { Vue, Component, Watch } from "vue-property-decorator";
import checkPermission from "@/utils/permission"; // 許可權判斷函數
@Component
export default class Access extends Vue {
  hasPerms(params) {
    return checkPermission(params);
  }
}
</script>