Firebase在iOS上删除帐户以及数据库和存储

Question

我试图实现一个功能来删除当前用户的帐户上iOS。帐户删除工作正常，但问题是删除帐户时，我无法从数据库和存储中删除帐户的数据。

“currentUser.delete”删除该帐户，但我认为没有身份验证可以从数据库和存储中删除其数据。日志中将显示“权限被拒绝”消息。运行此功能后，我看到Firebase控制台验证页面中的帐户已消失，但来自数据库和存储的数据仍然存在。

这是删除帐户的正确方法吗？

在删除帐户之前，我试图从数据库和存储中删除数据。但是，如果会话超过5分钟，Firebase会要求重新验证。在再次执行帐户删除之前，重新登录会向用户显示空数据，因此这会产生误导，并且非常令人困惑。

请告诉我删除帐户时如何删除数据。

private func deleteAccount() {
  guard let currentUser = Auth.auth().currentUser else {
    return print("user not logged in")
  }

  currentUser.delete { error in
    if error == nil {
      // 1. Delete currentUser's data from Database. Permission denied
      // 2. Delete currentUser's data from Storage. Permission denied
      // present login screen (welcome page)
      self.presentLoginScreen()
    } else {
      guard let errorCode = AuthErrorCode(rawValue: error!._code) else { return }

      if errorCode == AuthErrorCode.requiresRecentLogin {
        self.showMessage("Please re-authenticate to delete your account.", type: .error)

        do {
          try Auth.auth().signOut()
          self.presentLoginScreen()
        } catch {
          print("There was a problem logging out")
        }
      }
    }
  }
}

Answer 1

要解决您提到的问题（在删除实际用户之前删除数据，并可能获得authrorcode.requiresRecentLogin错误），您可以使用DispatchGroup并检查LastSignendate，如下所示（只需调用deleteUserProcess（））：

let deleteDataGroup = DispatchGroup()

func deleteUserProcess() {
    guard let currentUser = Auth.auth().currentUser else { return }
    deleteUserData(user: currentUser)
    // Call deleteUser only when all data has been deleted
    deleteDataGroup.notify(queue: .main) {
        self.deleteUser(user: currentUser)
    }
}
/// Remove data from Database & Storage
func deleteUserData(user currentUser: User) {
    // Check if `currentUser.delete()` won't require re-authentication
    if let lastSignInDate = currentUser.metadata.lastSignInDate,
        lastSignInDate.minutes(from: Date()) >= -5 {
        deleteDataGroup.enter()
        Database.database().reference().child(userId).removeValue { error, _ in
            if let error = error { print(error) }
            self.deleteDataGroup.leave()
        }
        // Delete folders from Storage isn't possible,
        // so list and run over all files to delete each one independently
        deleteDataGroup.enter()
        Storage.storage().reference().child(userId).listAll { list, error in
            if let error = error { print(error) }
            list.items.forEach({ file in
                self.deleteDataGroup.enter()
                file.delete { error in
                    if let error = error { print(error) }
                    self.deleteDataGroup.leave()
                }
            })
            deleteDataGroup.leave()
        }
    }
}

/// Delete user
func deleteUser(user currentUser: User) {
    currentUser.delete { error in
        if let error = error {
            if AuthErrorCode(rawValue: error._code) == .requiresRecentLogin {
                reauthenticate()
            } else {
                // Another error occurred
            }
            return
        }

        // Logout properly
        try? Auth.auth().signOut()
        GIDSignIn.sharedInstance.signOut()
        LoginManager().logOut()

        // The user has been deleted successfully
        // TODO: Redirect to the login UI
    }
}

func reauthenticate() {
    // TODO: Display some UI to get credential from the user
    let credential = ... // Complete from https://stackoverflow.com/a/38253448/8157190
    Auth.auth().currentUser?.reauthenticate(with: credential) { _, error in
        if let error = error {
            print(error)
            return
        }

        // Reload user (to update metadata.lastSignInDate)
        Auth.auth().currentUser?.reload { error in
            if let error = error {
                print(error)
                return
            }
            // TODO: Dismiss UI
            // Call `deleteUserProcess()` again, this time it will delete the user
            deleteUserProcess()
        }
    }
}

小步舞曲功能可以添加到日期的扩展中（感谢Leo Dabus）：

extension Date {
    /// Returns the amount of minutes from another date
    func minutes(from date: Date) -> Int {
        return Calendar.current.dateComponents([.minute], from: date, to: self).minute ?? 0
    }
}

Answer 2

您可以首先通过UID删除特定用户及其值，然后删除用户，并在删除后将其带到根视图控制器或登录屏幕。

// removing user data from firebase and its specific user id 
         let user = Auth.auth().currentUser
        user?.delete { error in
          if let error = error {
            // An error happened.
            print(error.localizedDescription)
          } else {
            Database.database().reference().child("users").child(user?.uid ?? "").removeValue()
            self.navigationController?.popToRootViewController(animated: true)
            // Account deleted and logout user
//            do {
//                try Auth.auth().signOut()
                // take you to root
//                self.navigationController?.popToRootViewController(animated: true)


        }