Startup.cs

using System;
using System.Text;
using Admin.Database;
using Admin.Helpers;
using Admin.Services;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.IdentityModel.Tokens;
using Newtonsoft.Json;
using Pomelo.EntityFrameworkCore.MySql.Infrastructure;

namespace Admin
{
    public class Startup
    {
        public IConfiguration Configuration;
        
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }
        
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers().AddNewtonsoftJson(options => 
                options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore);

            services.AddScoped<IModService, ModService>();
            
            const string con = "Server=localhost;Database=master;User=root;";

            services.AddDbContext<ApplicationContext>(options => 
                options.UseLazyLoadingProxies().UseMySql(con,
                    mysqloptions => mysqloptions.ServerVersion
                        (new Version(10,5,5), ServerType.MariaDb)));

            var appSettings = Configuration.GetSection("AppSettings");
            services.Configure<AppSettings>(appSettings);

            var appSettingsData = appSettings.Get<AppSettings>();
            var key = Encoding.ASCII.GetBytes(appSettingsData.Secret);
            
            services.AddAuthentication(x =>
                {
                    x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                    x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
                })
                .AddJwtBearer(x =>
                {
                    x.RequireHttpsMetadata = false;
                    x.SaveToken = true;
                    x.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuerSigningKey = true,
                        IssuerSigningKey = new SymmetricSecurityKey(key),
                        ValidateIssuer = false,
                        ValidateAudience = false
                    };
                });
            
            services.AddControllers();

            services.AddControllersWithViews();
        }
        
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseHsts();

            app.UseRouting();

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

            app.UseHttpsRedirection();
            app.UseCors(options => options.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader());

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