Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using APITest.Domain.Repositories;
using APITest.Domain.Services;
using APITest.Presistence.Contexts;
using APITest.Presistence.Repositories;
using APITest.Services;
using APITest.Domain.Models;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using Microsoft.IdentityModel.Tokens;
using System;

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

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {

            services.AddMvc(options => options.EnableEndpointRouting = false).SetCompatibilityVersion(CompatibilityVersion.Latest);

            services.AddDbContext<AppDbContext>(options =>{
                options.UseInMemoryDatabase("apitest-in-memory");
            });

            services.AddControllers();

            
            services.AddScoped<IUserRepository, UserRepository>();
            services.AddScoped<IFileRepository, FileRepository>();

            services.AddSingleton<ITokenHandler, APITest.Services.TokenHandler>();

            services.AddScoped<IUserService, UserService>();
            services.AddScoped<IFileService, FileService>();
            services.AddScoped<IAuthenticationService, AuthenticationService>();

            services.Configure<TokenOptions>(Configuration.GetSection("TokenOptions"));
			var tokenOptions = Configuration.GetSection("TokenOptions").Get<TokenOptions>();

            if(tokenOptions == null){
                Console.WriteLine("бля");
            }

            var signingConfigurations = new SigningConfigurations(tokenOptions.Secret);
			services.AddSingleton(signingConfigurations);

            
            services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
				.AddJwtBearer(jwtBearerOptions =>
				{
					jwtBearerOptions.TokenValidationParameters = new TokenValidationParameters()
					{
						ValidateAudience = true,
						ValidateLifetime = true,
						ValidateIssuerSigningKey = true,
						ValidIssuer = tokenOptions.Issuer,
						ValidAudience = tokenOptions.Audience,
						IssuerSigningKey = signingConfigurations.SecurityKey,
						ClockSkew = TimeSpan.Zero
					};
				});


            
        }

        // 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();
            } else {
                app.UseHsts();
            }

            app.UseAuthentication();

            app.UseHttpsRedirection();

            app.UseMvc();
        }
    }
}