Add adal token renewal to App startup

gistfile1.txt

export default Vue.extend({
  name: 'app',
  created: function() {
    // Add an utility method to check token on startup
    // because the necessary renewal when expired etc isn't handled for now by vue-adal package.
    // (see a comment in https://github.com/survirtual/vue-adal/issues/2).
    const resource = AuthenticationContext.config.clientId
    AuthenticationContext.acquireToken(resource, (err: any, token: any) => {
      if (err) {
        let errCode = err.split(':')[0]
        switch (errCode) {
          case 'AADSTS50058': // Need to prompt for user sign in
            AuthenticationContext.login()
            break
          case 'AADSTS65001': // Token is invalid; grab a new one
            AuthenticationContext.acquireTokenRedirect(resource)
            break
          case 'AADSTS16000': // No Access
          default:
            // Need a pop-up forcing a login
            AuthenticationContext.login()
            break
        }
      }
    })
  },
  computed: {
    isAuthenticated(): boolean {
      return this.$adal.isAuthenticated()
    }
  },
  methods: {
    logOut() {
      this.$adal.logout()
    }
  }
})