150 lines
4.2 KiB
C#
150 lines
4.2 KiB
C#
using Prism.Commands;
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using Prism.Services.Dialogs;
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using Store.Management.Api.Transport;
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using Store.Management.Framework.Controls;
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using Store.Management.Framework.Services;
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using Store.Management.Framework.ViewModels;
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using System.ComponentModel;
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using System.ComponentModel.DataAnnotations;
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using System.Security.Cryptography;
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using System.Text;
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using System.Windows.Input;
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namespace Store.Management.ViewModels;
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public enum EEE
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{
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[Description("管理员")]
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Admin,
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[Description("用户")]
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User
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}
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/// <summary>登录校验、认证请求和窗口生命周期内的请求取消。</summary>
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public sealed class LoginViewModel(ILoginService loginService) : ConfirmDialogViewModel, IDisposable
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{
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private EEE _ee;
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public EEE ee
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{
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get => _ee;
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set => SetProperty(ref _ee, value);
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}
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private readonly CancellationTokenSource _lifetime = new();
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private string _userName = "";
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private string _passwordHash = "";
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private bool _disposed;
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private bool _authenticated;
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public const int InputMaxLength = 250;
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public LoadingStatus LoadingStatus { get; } = new();
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public string UserName { get => _userName; set => SetProperty(ref _userName, value); }
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public bool CanEdit => !LoadingStatus.IsLoading && !_disposed && !_authenticated;
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public string LoginButtonText => LoadingStatus.IsLoading ? "正在登录…" : "登录";
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public event EventHandler? ClearPasswordRequested;
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/// <summary>仅由密码控件桥接调用，不保存明文密码。</summary>
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public void UpdatePassword(string password)
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{
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if (!CanEdit)
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{
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return;
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}
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// 服务端要求 UTF-8 密码的 32 位大写 MD5，保留首尾空格。
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_passwordHash = string.IsNullOrEmpty(password)
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? "" : Convert.ToHexString(MD5.HashData(Encoding.UTF8.GetBytes(password)));
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}
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public override ICommand ConfirmCommand => LoginCommand;
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public override void OnDialogOpened(IDialogParameters parameters)
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{
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Title = "门店管理 · 登录";
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}
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public override void OnDialogClosed() => Dispose();
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public AsyncDelegateCommand LoginCommand => field ??= new AsyncDelegateCommand(LoginAsync, () => CanEdit);
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private async Task LoginAsync()
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{
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if (!CanEdit)
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{
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return;
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}
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if (string.IsNullOrWhiteSpace(UserName))
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{
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LoadingStatus.Error("请输入用户名。");
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return;
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}
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if (string.IsNullOrEmpty(_passwordHash))
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{
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LoadingStatus.Error("请输入密码。");
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return;
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}
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LoadingStatus.Initialize("正在验证账号，请稍候…");
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NotifyStateChanged();
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try
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{
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await loginService.LoginAsync(UserName, _passwordHash, _lifetime.Token);
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if (!_disposed)
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{
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_authenticated = true;
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OnRequestClose(new DialogResult(ButtonResult.OK));
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}
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}
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catch (OperationCanceledException) when (_disposed)
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{
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// 关闭窗口产生的取消无需提示。
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}
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catch (ApiException ex)
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{
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if (!_disposed)
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{
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LoadingStatus.Error(ex.Message);
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}
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}
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catch (OperationCanceledException)
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{
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LoadingStatus.Error("登录已取消，请重试。");
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}
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catch (Exception)
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{
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if (!_disposed)
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{
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LoadingStatus.Error("登录失败，请稍后重试。");
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}
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}
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finally
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{
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_passwordHash = "";
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if (!_disposed)
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{
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LoadingStatus.Done();
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ClearPasswordRequested?.Invoke(this, EventArgs.Empty);
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NotifyStateChanged();
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}
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}
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}
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private void NotifyStateChanged()
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{
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RaisePropertyChanged(nameof(CanEdit));
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RaisePropertyChanged(nameof(LoginButtonText));
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LoginCommand.RaiseCanExecuteChanged();
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}
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public void Dispose()
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{
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if (_disposed)
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{
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return;
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}
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_disposed = true;
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_passwordHash = "";
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_lifetime.Cancel();
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_lifetime.Dispose();
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}
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}
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