TechHelper/TechHelper.Client/HttpInterceptor/HttpInterceptorHandlerService.cs

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;

			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;
				}

			}
		}
	}
}