添加项目文件。

TechHelper.Client/HttpInterceptor/HttpInterceptorHandlerService.cs

@@ -0,0 +1,86 @@
+using TechHelper.Client.HttpRepository;
+using Microsoft.AspNetCore.Components;
+using System.Net;
+using System.Net.Http.Headers;
+using MudBlazor;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+
+namespace BlazorProducts.Client.HttpInterceptor
+{
+	public class HttpInterceptorHandlerService : DelegatingHandler
+	{
+		private readonly NavigationManager _navManager;
+
+		private readonly RefreshTokenService _refreshTokenService;
+
+		private readonly ISnackbar _serviceProvider;
+		private ISnackbar toastService = null;
+
+		public HttpInterceptorHandlerService(
+			NavigationManager navManager,
+			RefreshTokenService refreshTokenService,
+			ISnackbar serviceProvider)
+		{
+			_navManager = navManager;
+			_refreshTokenService = refreshTokenService;
+			_serviceProvider = serviceProvider;
+		}
+
+		protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+		{
+			var absolutePath = request.RequestUri?.AbsolutePath;
+
+			_serviceProvider.Add("HELLO");
+			if (absolutePath != null && !absolutePath.Contains("token") && !absolutePath.Contains("account"))
+			{
+				var token = await _refreshTokenService.TryRefreshToken();
+				if (!string.IsNullOrEmpty(token))
+				{
+					request.Headers.Authorization =
+						new AuthenticationHeaderValue("bearer", token);
+				}
+			}
+
+			var response = await base.SendAsync(request, cancellationToken);
+
+			HandleResponse(response);
+
+			return response;
+		}
+
+		private void HandleResponse(HttpResponseMessage response)
+		{
+			if (response is null)
+			{
+				_navManager.NavigateTo("/error");
+				throw new HttpResponseException("Server not available.");
+			}
+
+			var message = "";
+
+			if (!response.IsSuccessStatusCode)
+			{
+				switch (response.StatusCode)
+				{
+					case HttpStatusCode.NotFound:
+						_navManager.NavigateTo("/404");
+						message = "Resource not found.";
+						break;
+					case HttpStatusCode.BadRequest:
+						message = "Invalid request. Please try again.";
+						break;
+					case HttpStatusCode.Unauthorized:
+						_navManager.NavigateTo("/unauthorized");
+						message = "Unauthorized access";
+						break;
+					default:
+						_navManager.NavigateTo("/error");
+						message = "Something went wrong. Please contact the administrator.";
+						break;
+				}
+
+			}
+		}
+	}
+}

TechHelper.Client/HttpInterceptor/HttpResponseException.cs

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+using System;
+using System.Runtime.Serialization;
+
+namespace BlazorProducts.Client.HttpInterceptor
+{
+	[Serializable]
+	internal class HttpResponseException : Exception
+	{
+		public HttpResponseException()
+		{
+		}
+
+		public HttpResponseException(string message) : base(message)
+		{
+		}
+
+		public HttpResponseException(string message, Exception innerException) 
+			: base(message, innerException)
+		{
+		}
+
+		protected HttpResponseException(SerializationInfo info, StreamingContext context) 
+			: base(info, context)
+		{
+		}
+	}
+}