Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.Extensions.Hosting;
using Microsoft.IdentityModel.Tokens;
using System.Text;
using Microsoft.Extensions.Logging;
using RailTimesApi.Data;

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

        public IConfiguration Configuration { get; }
        readonly string AllowFrontEndCors = "AllowFrontEndAppAccessCors";

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            services.AddHttpClient();

            services.AddCors(options =>
            {
                options.AddPolicy(AllowFrontEndCors,
                builder =>
                {
                    builder
                        .WithOrigins("http://localhost:3000", "https://localhost:3000")
                        .AllowAnyHeader()
                        .AllowAnyMethod();
                });
            });

            services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("MsSqlDockerConn")));
            services.AddIdentity<ApplicationUser, IdentityRole>(options => 
                {
                    options.Password.RequiredLength = 4;
                    options.Password.RequireLowercase = false;
                    options.Password.RequireUppercase = false;
                    options.Password.RequireNonAlphanumeric = false;
                    options.Password.RequireDigit = false;
                })
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders();
            
            services.AddAuthentication(options =>
            {
                options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
            })
            .AddJwtBearer(options =>
            {
                options.SaveToken = true;
                options.RequireHttpsMetadata = false;
                options.TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters()
                {
                    ValidateIssuer = true,
                    ValidateAudience = true,
                    ValidAudience = "willthiswork",
                    ValidIssuer = "willthiswork",
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("secret key for noahs super awesome project"))
                };
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            SeedDB.Initialize(app.ApplicationServices.GetRequiredService<IServiceScopeFactory>().CreateScope().ServiceProvider);

            app.UseCors(AllowFrontEndCors); 

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthentication();
            app.UseAuthorization();

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