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src/permission.js

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+import router from './router'
+import store from './store'
+import { Message } from 'element-ui'
+import NProgress from 'nprogress' // progress bar
+import 'nprogress/nprogress.css' // progress bar style
+import { getToken } from '@/utils/auth' // get token from cookie
+import getPageTitle from '@/utils/get-page-title'
+
+NProgress.configure({ showSpinner: false }) // NProgress Configuration
+
+const whiteList = ['/login', '/auth-redirect'] // no redirect whitelist
+
+router.beforeEach(async(to, from, next) => {
+  // start progress bar
+  NProgress.start()
+
+  // set page title
+  document.title = getPageTitle(to.meta.title)
+
+  // determine whether the user has logged in
+  const hasToken = getToken()
+
+  if (hasToken) {
+    if (to.path === '/login') {
+      // if is logged in, redirect to the home page
+      next({ path: '/' })
+      NProgress.done()
+    } else {
+      // determine whether the user has obtained his permission roles through getInfo
+      const hasRoles = store.getters.roles && store.getters.roles.length > 0
+      if (hasRoles) {
+        next()
+      } else {
+        try {
+          // get user info
+          // note: roles must be a object array! such as: ['admin'] or ,['developer','editor']
+          const { roles } = await store.dispatch('user/getInfo')
+
+          // generate accessible routes map based on roles
+          const accessRoutes = await store.dispatch('permission/generateRoutes', roles)
+
+          // dynamically add accessible routes
+          router.addRoutes(accessRoutes)
+
+          // hack method to ensure that addRoutes is complete
+          // set the replace: true, so the navigation will not leave a history record
+          next({ ...to, replace: true })
+        } catch (error) {
+          // remove token and go to login page to re-login
+          // await store.dispatch('user/resetToken')
+          Message.error(error || 'Has Error')
+          next(`/login?redirect=${to.path}`)
+          NProgress.done()
+        }
+      }
+    }
+  } else {
+    /* has no token*/
+
+    if (whiteList.indexOf(to.path) !== -1) {
+      // in the free login whitelist, go directly
+      next()
+    } else {
+      // other pages that do not have permission to access are redirected to the login page.
+      next(`/login?redirect=${to.path}`)
+      NProgress.done()
+    }
+  }
+})
+
+router.afterEach(() => {
+  // finish progress bar
+  NProgress.done()
+})