jwt_authcontroller.cs

using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Security.Claims;
using System.Text;
using System.Threading.Tasks;
using aspnetcore_jwt.AuthServer.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.IdentityModel.Tokens;

namespace aspnetcore_jwt.AuthServer.Controllers
{
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class AuthController : Controller
    {
        private IConfiguration _config;
        
        public AuthController( IConfiguration config)
        {
            this._config = config;
        }
        
        [HttpPost]
        public IActionResult Token(LoginViewModel loginViewModel ){
            //return new JwtTokenHandler
            var token = GenerateJSONWebToken(loginViewModel);
            return Ok(new { Token = token});
        }

        private string GenerateJSONWebToken(LoginViewModel userInfo)
        {
            var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_config["Jwt:key"]));
            var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

            var claims = new List<Claim>(){ new Claim(ClaimTypes.Name, userInfo.username),
                new Claim(ClaimTypes.NameIdentifier, userInfo.username)
            };
            var token = new JwtSecurityToken(_config["Jwt:issuer"],
              _config["Jwt:issuer"],
              claims,
              expires: DateTime.Now.AddMinutes(1),
              signingCredentials: credentials);
            
            return new JwtSecurityTokenHandler().WriteToken(token);
        }
    }
}