eshop/Eshop/Eshop.Infrastructure/DependencyInjection.cs

using Eshop.Application.Auth;
using Eshop.Infrastructure.Identity;
using Eshop.Infrastructure.Persistence;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace Eshop.Infrastructure;

public static class DependencyInjection
{
    public static IServiceCollection AddInfrastructure(this IServiceCollection services) =>
        AddApplicationServices(services);

    public static IServiceCollection AddInfrastructure(
        this IServiceCollection services,
        IConfiguration configuration)
    {
        var connectionString = configuration.GetConnectionString("DefaultConnection")
            ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");

        services.AddDbContext<AppDbContext>(options =>
            options.UseNpgsql(connectionString));

        var pwSection = configuration.GetSection("Identity:Password");
        services.AddIdentity<UserEntity, IdentityRole>(options =>
            {
                options.Password.RequiredLength = pwSection.GetValue<int>("RequiredLength", 6);
                options.Password.RequireDigit = pwSection.GetValue<bool>("RequireDigit", true);
                options.Password.RequireLowercase = pwSection.GetValue<bool>("RequireLowercase", true);
                options.Password.RequireUppercase = pwSection.GetValue<bool>("RequireUppercase", true);
                options.Password.RequireNonAlphanumeric = pwSection.GetValue<bool>("RequireNonAlphanumeric", false);
                options.Password.RequiredUniqueChars = pwSection.GetValue<int>("RequiredUniqueChars", 1);
            })
            .AddEntityFrameworkStores<AppDbContext>()
            .AddDefaultTokenProviders();

        services.ConfigureApplicationCookie(options =>
        {
            options.LoginPath = "/Auth/Login";
            options.AccessDeniedPath = "/Auth/AccessDenied";
            options.ExpireTimeSpan = TimeSpan.FromHours(2);
        });

        return AddApplicationServices(services);
    }

    private static IServiceCollection AddApplicationServices(IServiceCollection services)
    {
        services.AddScoped<IAuthenticationService, AspNetIdentityAuthenticationService>();
        services.AddScoped<IUserAccountService, AspNetIdentityUserAccountService>();
        services.AddScoped<IUserAdministrationService, AspNetIdentityUserAdministrationService>();
        return services;
    }
}