Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using BookStore.API.Data;
using BookStore.API.Models;
using BookStore.API.Repository;
using Microsoft.AspNetCore.Authentication.JwtBearer;
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.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.IdentityModel.Tokens;

namespace BookStore.API
{
    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.AddDbContext<BookStoreContext>(
                options => options.UseSqlServer(Configuration.GetConnectionString("BookStoreDB")));

            services.AddIdentity<ApplicationUser, IdentityRole>()
                .AddEntityFrameworkStores<BookStoreContext>()
                .AddDefaultTokenProviders();

            services.AddAuthentication(option =>
            {
                option.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                option.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
                option.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
            })
                .AddJwtBearer(option =>
                {
                    option.SaveToken = true;
                    option.RequireHttpsMetadata = false;
                    option.TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters()
                    {
                        ValidateIssuer = true,
                        ValidateAudience = true,
                        ValidAudience = Configuration["JWT:ValidAudience"],
                        ValidIssuer = Configuration["JWT:ValidIssuer"],
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration["JWT:Secret"]))
                    };
                });

            services.AddControllers().AddNewtonsoftJson();
            services.AddTransient<IBookRepository, BookRepository>();
            services.AddTransient<IAccountRepository, AccountRepository>();
            services.AddAutoMapper(typeof(Startup));

            services.AddCors(option=>
            {
                option.AddDefaultPolicy(builder =>
                {
                    builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod();
                });
            });
        }

        // 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();
            }

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseCors();

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

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