Question

我使用代码验证jwt是否已过期（来自angular2-jwt）。但是如果用户在localStorage中更改令牌的值，则ex： id_token =＆gt; “123”，它显示错误并停止应用程序。但是，我想在Guard中处理这个错误。

//错误：

var PreDefinedTasks = ["1", "2", "3", "4"]

// MARK: - Table view data source

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)

    if let cell = tableView.cellForRow(at: indexPath as IndexPath) {
        if cell.accessoryType == .checkmark{
            cell.accessoryType = .none
        }
        else{
            cell.accessoryType = .checkmark
        }
    }
}

override func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return PreDefinedTasks.count
}


override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "List1", for: indexPath)

    cell.textLabel?.text = PreDefinedTasks[indexPath.row]

    return cell
}

如果抛出throw会如何在Guard中处理此错误？

// Guard.ts：

core.es5.js:1020 ERROR Error: Uncaught (in promise): Error: JWT must have 3 parts
Error: JWT must have 3 parts

//其中一项功能：

 canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean>|boolean
 {

          if (this.tokenService.isTokenExpired(token)) {
              this.auth.loggedIn = false;
              this.loginService.logout();
              this.notifications.success = false;
              this.notifications.status = 401;
              this.notifications.state = 'alertFail';
              this.notifications.message = 'Token Expirado! Faça o login novamente.';
              this.notifications.arrayError = [];
              this.notifications2.setNotifications(this.notifications);
              this.router.navigate(['/login']);
              return false;
          }

      return true;
      }

Answer 1

你正在尝试使用try / catch块：

    canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean>|boolean
     {
         try {
              if (this.tokenService.isTokenExpired(token)) {
                  this.auth.loggedIn = false;
                  this.loginService.logout();
                  this.notifications.success = false;
                  this.notifications.status = 401;
                  this.notifications.state = 'alertFail';
                  this.notifications.message = 'Token Expirado! Faça o login novamente.';
                  this.notifications.arrayError = [];
                  this.notifications2.setNotifications(this.notifications);
                  this.router.navigate(['/login']);
                  return false;
              }
            }
          catch (e) {
             return false;
          }
          return true;
 }

处理Angular 2/4中正常功能的错误

1 个答案: