Startup.cs

using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using SantafeApi.Infraestrucutre.Data;
using SantafeApi.Installers;
using SantafeApi.Utils;

namespace SantafeApi
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;

        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            InstallerExtensions.InstallServicesInAssembly(services, Configuration);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(
            IApplicationBuilder app,
            IWebHostEnvironment env,
            IServiceProvider serviceProvider
            )
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseSwagger();
                app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "SantafeApi v1"));
            }

            // app.UseHttpsRedirection();

            app.UseRouting();
            app.UseCors(builder => builder
                        .AllowAnyOrigin()
                        .AllowAnyMethod()
                        .AllowAnyHeader());
            app.UseAuthentication();
            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
            CreateRoles(serviceProvider).Wait();

        }
        private async Task CreateRoles(IServiceProvider serviceProvider)
        {
            //adding customs roles : Question 1
            var RoleManager = serviceProvider.GetRequiredService<RoleManager<IdentityRole>>();
            var UserManager = serviceProvider.GetRequiredService<UserManager<SantafeApiUser>>();
            string[] roleNames = { "Admin", "Customer", };
            IdentityResult roleResult;

            foreach (var roleName in roleNames)
            {
                var roleExist = await RoleManager.RoleExistsAsync(roleName);
                if (!roleExist)
                {
                    //create the roles and seed them to the database: Question 2
                    roleResult = await RoleManager.CreateAsync(new IdentityRole(roleName));
                }
            }

            //Here you could create a super user who will maintain the web app
            var poweruser = new SantafeApiUser
            {
                UserName = Configuration.GetSection("SuperUser:Email").ToString(),
                Email = Configuration.GetSection("SuperUser:Email").ToString(),
            };

            string userPWD = Configuration.GetSection("SuperUser:Password").ToString();
            var _user = await UserManager.FindByEmailAsync(Configuration.GetSection("SuperUser:Email").ToString());

            if (_user == null)
            {
                var createPowerUser = await UserManager.CreateAsync(poweruser, userPWD);
                if (createPowerUser.Succeeded)
                {
                    //here we tie the new user to the role : Question 3
                    await UserManager.AddToRoleAsync(poweruser, "Admin");

                }
            }
        }
    }
}