Startup.cs

using AutoMapper;
using Friendster.Data;
using Friendster.Helpers;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Diagnostics;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SpaServices.AngularCli;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.IdentityModel.Tokens;
using Newtonsoft.Json;
using System.Net;
using System.Text;

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

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<DataContext>(options =>
            {
                options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection"));
            });

            services.AddTransient<Seeder>();

            services.Configure<CloudSettings>(Configuration.GetSection("CloudSettings"));
            services.AddScoped<IAuthRepository, AuthRepository>();
            services.AddScoped<IFriendRepository, FriendRepository>();
            services.AddScoped<LogActivity>();

            services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
                .AddJwtBearer(options =>
                {
                    options.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuerSigningKey = true,
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Configuration.GetSection("AppSettings:Token").Value)),
                        ValidateIssuer = false,
                        ValidateAudience = false
                    };
                });

            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1)
                .AddJsonOptions(options =>
                {
                    options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
                });

            services.AddAutoMapper();
            services.AddCors();
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, Seeder seeder)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler(builder =>
                {
                    builder.Run(async context =>
                    {
                        context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
                        var error = context.Features.Get<IExceptionHandlerFeature>();
                        if (error != null)
                        {
                            context.Response.AddApplicationError(error.Error.Message);
                            await context.Response.WriteAsync(error.Error.Message);
                        }
                    });
                });
            }

            seeder.SeedUsers();

            app.UseCors(config =>
            {
                config.AllowAnyOrigin();
                config.AllowAnyMethod();
                config.AllowAnyHeader();
            });

            app.UseAuthentication();
            app.UseDefaultFiles();
            app.UseStaticFiles();
            app.UseMvc(routes =>
            {
                if (env.IsProduction())
                {
                    routes.MapSpaFallbackRoute(
                    name: "fallback",
                    defaults: new { controller = "Fallback", action = "Index" });
                }
            });

            app.UseSpa(spa =>
            {
                spa.Options.SourcePath = "Client";

                if (env.IsDevelopment())
                {
                    spa.UseAngularCliServer(npmScript: "start");
                }
            });
        }
    }
}