skantravels/services/AuthorizationService/Application/Users/Commands/LoginUser.cs

using AuthorizationService.Models;
using AuthorizationService.Persistence.Repositories;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using Microsoft.VisualStudio.Web.CodeGenerators.Mvc.Templates.BlazorIdentity.Pages;
using System.Configuration;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;

namespace AuthorizationService.Application.Users.Commands
{
    public class LoginUser
    {
        private readonly IUserRepository _repository;
        private readonly IConfiguration _configuration;

        public LoginUser(IUserRepository repository, IConfiguration configuration)
        {
            _repository = repository;
            _configuration = configuration;
        }

        public async Task<IActionResult> Handle(LoginDTO loginDTO)
        {
            User user = await _repository.QueryUserByEmailAsync(loginDTO.Email);
            if (user == null || !BCrypt.Net.BCrypt.Verify(loginDTO.Password, user.HashedPassword))
            {
                return new UnauthorizedObjectResult(new { message = "Invalid email or password." });
            }
            var token = GenerateJwtToken(user);

            return new OkObjectResult(token);

        }

        private string GenerateJwtToken(User user)
        {
            var claims = new[]
            {
                new Claim(JwtRegisteredClaimNames.Sub, user.Id),
                new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
                new Claim(ClaimTypes.Name, user.Username)
            };

            var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes
            (_configuration["JwtSettings:Key"]));
            var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

            var token = new JwtSecurityToken(
                _configuration["JwtSettings:Issuer"],
                _configuration["JwtSettings:Audience"],
                claims,
                expires: DateTime.Now.AddMinutes(30),
                signingCredentials: creds);

            return new JwtSecurityTokenHandler().WriteToken(token);
        }
    }
}