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.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using AutoMapper;
using PresentationCreatorWeb.Data;
using PresentationCreatorWeb.Data.Repositories;
using PresentationCreatorWeb.Helpers;

namespace PresentationCreatorWeb
{
    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.AddControllers();
            services.AddEntityFrameworkNpgsql()
               .AddDbContext<ApplicationContext>()
               .BuildServiceProvider();
            services.AddAutoMapper(typeof(Startup));
            services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
                .AddJwtBearer(options => {
                    options.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuerSigningKey = true,
                        IssuerSigningKey = new SymmetricSecurityKey(System.Text.Encoding.ASCII
                            .GetBytes(Configuration.GetSection("Security:TokenSecretKey").Value)),
                        ValidateIssuer = false,
                        ValidateAudience = false
                    };
                });
            services.AddCors(options =>
            {
                options.AddPolicy("default", policy =>
                {
                    policy
                        .AllowAnyOrigin()
                        .AllowAnyHeader()
                        .AllowAnyMethod();
                });
            });
            services.AddScoped<IAuthRepository, AuthRepository>();
        }

        // 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("default");

            app.UseAuthentication();

            app.UseAuthorization();

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