Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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;
using TaskProject.Data;
using TaskProject.Services;
using TaskProject.Services.Interfaces;

namespace TaskProject
{
    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)
        {
            
            // Configure Entityframecore with SQL SErver
            services.AddDbContext<ApplicationDbContext>(options =>
            {
                options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection"));
            });

            services.AddIdentity<TaskProject.Models.AppUser, IdentityRole>(options =>
            {
                options.Password.RequireDigit = true;
                options.Password.RequireLowercase = true;
                options.Password.RequiredLength = 5;
            }).AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders();




            services.AddAuthentication(auth =>
            {
                auth.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                auth.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
            }).AddJwtBearer(options =>
            {
                options.TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters
                {
                    ValidateIssuer = true,
                    ValidateAudience = true,
                    ValidAudience = Configuration["AuthSettings:Audience"],
                    ValidIssuer = Configuration["AuthSettings:Issuer"],
                    RequireExpirationTime = true,
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration["AuthSettings:Key"])),
                    ValidateIssuerSigningKey = true
                };
            });

            services.AddControllers();
            services.AddCors(c => c.AddPolicy("AllowOrigin", options => options.WithOrigins("http://localhost:4201").AllowAnyHeader().AllowAnyMethod()));
            





            services.AddScoped<IAuthRepository, AuthRepository>();
            services.AddScoped<IUsersRepository, UsersRepository>();
            //services.AddTransient<IMailService, SendGridMailService>();
            services.AddControllers();
            services.AddRazorPages();
        }

        // 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(options => options.WithOrigins("http://localhost:4201").AllowAnyHeader());
            app.UseAuthentication();
            app.UseAuthorization();

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