ExamEdit&Check

TechHelper.Client/HttpRepository/RefreshTokenService2.cs

@@ -0,0 +1,46 @@
+using Microsoft.AspNetCore.Components.Authorization;
+
+namespace TechHelper.Client.HttpRepository
+{
+	public class RefreshTokenService2
+	{
+		private readonly Lazy<AuthenticationStateProvider> _authenticationStateProvider;
+		private readonly Lazy<IAuthenticationClientService> _authenticationClientService;
+
+		public RefreshTokenService2(IServiceProvider serviceProvider)
+		{
+			_authenticationStateProvider = new Lazy<AuthenticationStateProvider>(
+				() => serviceProvider.GetRequiredService<AuthenticationStateProvider>());
+
+			_authenticationClientService = new Lazy<IAuthenticationClientService>(
+				() => serviceProvider.GetRequiredService<IAuthenticationClientService>());
+		}
+
+		public async Task<string> TryRefreshToken()
+		{
+			var authState = await _authenticationStateProvider.Value.GetAuthenticationStateAsync();
+			var user = authState.User;
+
+			if (user?.Identity == null || !user.Identity.IsAuthenticated)
+			{
+				return string.Empty;
+			}
+
+			var expClaim = user.FindFirst(c => c.Type.Equals("exp"))?.Value; 
+			if (string.IsNullOrEmpty(expClaim))
+			{
+				return string.Empty; 
+			}
+
+			var expTime = DateTimeOffset.FromUnixTimeSeconds(
+				Convert.ToInt64(expClaim));
+
+			var diff = expTime - DateTime.UtcNow;
+
+			if (diff.TotalMinutes <= 2)
+				return await _authenticationClientService.Value.RefreshTokenAsync(); 
+
+			return string.Empty;
+		}
+	}
+}