51 lines
1.8 KiB
C#
51 lines
1.8 KiB
C#
using Microsoft.AspNetCore.Components.Authorization;
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using Microsoft.Extensions.DependencyInjection; // 需要这个命名空间来获取 IServiceProvider
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using System; // 需要这个命名空间来使用 Lazy<T>
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namespace TechHelper.Client.HttpRepository
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{
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public class RefreshTokenService : IRefreshTokenService
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{
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private readonly Lazy<AuthenticationStateProvider> _authenticationStateProvider;
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private readonly Lazy<IAuthenticationClientService> _authenticationClientService;
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public RefreshTokenService(IServiceProvider serviceProvider)
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{
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_authenticationStateProvider = new Lazy<AuthenticationStateProvider>(
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() => serviceProvider.GetRequiredService<AuthenticationStateProvider>());
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_authenticationClientService = new Lazy<IAuthenticationClientService>(
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() => serviceProvider.GetRequiredService<IAuthenticationClientService>());
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}
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public async Task<string> TryRefreshToken()
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{
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var authState = await _authenticationStateProvider.Value.GetAuthenticationStateAsync();
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var user = authState.User;
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// 如果 user 或 claims 为空，表示用户未认证，直接返回空字符串
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if (user?.Identity == null || !user.Identity.IsAuthenticated)
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{
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return string.Empty;
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}
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var expClaim = user.FindFirst(c => c.Type.Equals("exp"))?.Value; // 使用 ?. 防止空引用
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if (string.IsNullOrEmpty(expClaim))
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{
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return string.Empty; // 没有过期时间声明，也直接返回
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}
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var expTime = DateTimeOffset.FromUnixTimeSeconds(
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Convert.ToInt64(expClaim));
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var diff = expTime - DateTime.UtcNow;
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// 只有当令牌即将过期时才尝试刷新
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if (diff.TotalMinutes <= 2)
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return await _authenticationClientService.Value.RefreshTokenAsync(); // 访问 .Value 来调用方法
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return string.Empty;
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}
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}
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} |