FrontOffice/src/FrontOffice.Main/ConfigureServices.cs

using Blazored.LocalStorage;
using Grpc.Core;
using Grpc.Net.Client.Web;
using Grpc.Net.Client;
using MudBlazor.Services;
using System.Text.Json;
using System.Text.Json.Serialization;
using FrontOffice.BFF.Package.Protobuf.Protos.Package;
using FrontOffice.BFF.User.Protobuf.Protos.User;
using FrontOffice.BFF.UserAddress.Protobuf.Protos.UserAddress;
using FrontOffice.BFF.UserOrder.Protobuf.Protos.UserOrder;

namespace Microsoft.Extensions.DependencyInjection;

public static class ConfigureServices
{
    public static IServiceCollection AddCommonServices(this IServiceCollection services)
    {
        services.AddMudServices();
        services.AddBlazoredLocalStorage(config =>
        {
            config.JsonSerializerOptions.DictionaryKeyPolicy = JsonNamingPolicy.CamelCase;
            config.JsonSerializerOptions.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
            config.JsonSerializerOptions.IgnoreReadOnlyProperties = true;
            config.JsonSerializerOptions.PropertyNameCaseInsensitive = true;
            config.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
            config.JsonSerializerOptions.ReadCommentHandling = JsonCommentHandling.Skip;
            config.JsonSerializerOptions.WriteIndented = false;
        });
        return services;
    }

    public static IServiceCollection AddGrpcServices(this IServiceCollection services, IConfiguration configuration)
    {
        var baseUrl = configuration["GwUrl"];
        var httpClient = new HttpClient(new GrpcWebHandler(GrpcWebMode.GrpcWeb, new HttpClientHandler()));
        httpClient.Timeout = TimeSpan.FromMinutes(10); // TODO Check Timeout
        var serviceProvider = services.BuildServiceProvider();
        var channel = CreateAuthenticatedChannel(baseUrl, httpClient, serviceProvider);

        services.AddSingleton(sp => new PackageContract.PackageContractClient(channel));
        services.AddSingleton(sp => new UserContract.UserContractClient(channel));
        services.AddSingleton(sp => new UserAddressContract.UserAddressContractClient(channel));
        services.AddSingleton(sp => new UserOrderContract.UserOrderContractClient(channel));

        return services;
    }

    private static GrpcChannel CreateAuthenticatedChannel(string address, HttpClient httpClient, IServiceProvider serviceProvider)
    {
        var credentials = CallCredentials.FromInterceptor(async (context, metadata) =>
        {
            // Get token from local storage if available
            var localStorage = serviceProvider.GetService(typeof(ILocalStorageService)) as ILocalStorageService;
            if (localStorage != null)
            {
                var token = await localStorage.GetItemAsync<string>("auth:token");
                if (!string.IsNullOrWhiteSpace(token))
                {
                    metadata.Add("Authorization", $"Bearer {token}");
                }
            }
        });

        // SslCredentials is used here because this channel is using TLS.
        // CallCredentials can't be used with ChannelCredentials.Insecure on non-TLS channels.
        var channel = GrpcChannel.ForAddress(address, new GrpcChannelOptions
        {
            UnsafeUseInsecureChannelCallCredentials = true,
            Credentials = ChannelCredentials.Create(new SslCredentials(), credentials),
            HttpClient = httpClient,
            MaxReceiveMessageSize = 1000 * 1024 * 1024, // 1 GB
            MaxSendMessageSize = 1000 * 1024 * 1024 // 1 GB
        });
        return channel;
    }
}