Core.Inventory.Service/Core.Inventory.External/ClientConfiguration/RegisterClientConfiguration.cs

using Core.Inventory.External.Clients;
using Core.Inventory.External.GatewayConfigurations;
using Core.Inventory.External.Helpers;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Refit;

namespace Core.Inventory.External.ClientConfiguration
{
    public static class RegisterClientConfiguration
    {
        public static IServiceCollection RegisterExternalLayer(this IServiceCollection services, IConfiguration configuration)
        {
            var gatewayConfiguration = new GatewayConfiguration();
            var gatewaySettingsConfiguration = new GatewaySettingsConfigurations(configuration);

            // Register GatewayConfiguration as a singleton
            services.AddSingleton(gatewayConfiguration);

            // Register IHttpContextAccessor
            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

            // Register ITokenProvider
            services.AddSingleton<ITokenProvider, HttpContextTokenProvider>();

            // Register the custom AuthenticatedHttpClientHandler
            services.AddTransient(provider =>
            {
                var tokenProvider = provider.GetRequiredService<ITokenProvider>();
                var handler = new AuthenticatedHttpClientHandler(tokenProvider)
                {
                    InnerHandler = new HttpClientHandler()
                };
                return handler;
            });

            var inventoryServiceApiUrl = GatewaySettingsConfigurations.GetInventoryServiceAPIEndpoint().Endpoint.Url;

            // Register IInventoryServiceClient with the manually created HttpClient
            services.AddScoped<IInventoryServiceClient>(provider =>
            {
                var handler = provider.GetRequiredService<AuthenticatedHttpClientHandler>();
                var httpClient = new HttpClient(handler)
                {
                    BaseAddress = new Uri(inventoryServiceApiUrl),
                    Timeout = TimeSpan.FromMinutes(1)
                };
                return RestService.For<IInventoryServiceClient>(httpClient);
            });

            services.AddScoped<IAuthenticationService, AuthenticationService>();

            return services;
        }
    }
}