Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using r2bw.Data;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using AspNetCore.RouteAnalyzer;
using SendGrid;
using SendGrid.Helpers.Mail;
using Microsoft.AspNetCore.Identity.UI.Services;
using r2bw.Services;

namespace r2bw
{
    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)
        {
            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });

            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(
                    Configuration.GetConnectionString("DefaultConnection")));

            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

            services.AddIdentity<User, IdentityRole>(
                config => config.SignIn.RequireConfirmedEmail = true
            )
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders()
                .AddDefaultUI();

            services.AddTransient<UserManager<User>>();
            services.AddTransient<RoleManager<IdentityRole>>();

            services.AddTransient<IEmailSender, EmailSender>();

            services.AddRouteAnalyzer();

            services.AddAuthorization(options =>
            {
                options.AddPolicy("RequireAdministratorRole",
                    policy => policy.RequireRole("Administrator"));
            });

            services.AddScoped<SignInManager<User>, Managers.R2bwSignInManager<User>>();

            services.Configure<IdentityOptions>(options =>
            {
                options.Password.RequireDigit = false;
                options.Password.RequireLowercase = false;
                options.Password.RequireNonAlphanumeric = false;
                options.Password.RequireUppercase = false;
                options.Password.RequiredLength = 8;
                options.Password.RequiredUniqueChars = 1;
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider serviceProvider)
        {
            if (env.IsDevelopment())
            {
                app.UseDatabaseErrorPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                app.UseHsts();
            }

            app.UseDeveloperExceptionPage();

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseCookiePolicy();
            app.UseAuthentication();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
                routes.MapRouteAnalyzer("/routes");
            });

            CreateRoles(serviceProvider).Wait();
        }

        private async Task CreateRoles(IServiceProvider serviceProvider)
        {
            var RoleManager = serviceProvider.GetRequiredService<RoleManager<IdentityRole>>();
            var UserManager = serviceProvider.GetRequiredService<UserManager<User>>();
            string[] roleNames = { "Administrator", "Group-Leader", "User" };

            foreach (var roleName in roleNames)
            {
                //creating the roles and seeding them to the database
                if (!(await RoleManager.RoleExistsAsync(roleName)))
                {
                    await RoleManager.CreateAsync(new IdentityRole(roleName));
                }
            }

            // Create the Administrator
            var poweruser = new User
            {
                UserName = Configuration["AdminEmail"],
                Email = Configuration["AdminEmail"],
                FirstName = "Zach",
                LastName = "Johnston",
                Active = true,
                EmailConfirmed = true,
                LockoutEnabled = false,
                Size = "L",
                Sex = "Male",
                DateOfBirth = new DateTime(1992, 5, 12),
                WaiverSignedOn = DateTimeOffset.Now
            };

            string UserPassword = Configuration["AdminPassword"];
            var user = await UserManager.FindByEmailAsync(Configuration["AdminEmail"]);

            if(user == null)
            {
                var createPowerUser = await UserManager.CreateAsync(poweruser, UserPassword);
                if (createPowerUser.Succeeded)
                {
                    await UserManager.AddToRoleAsync(poweruser, "Administrator");
                }
            }
        }
    }
}