backend/Controllers/AuthController.cs

using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;
using Microsoft.AspNetCore.Mvc;
using Microsoft.IdentityModel.Tokens;

namespace backend.Controllers;

[ApiController]
[Route("[controller]")]
public class AuthController : ControllerBase
{
    public IConfiguration _configuration;
    public AuthController(IConfiguration configuration)
    {
        _configuration = configuration;
    }
    
    [HttpPost("login")]
    public async Task<IActionResult> Login(string username, string password)
    {
        if (username == "" || password == "")
        {
            return BadRequest("Invalid username or password");
        }

        if (username == "test" && password == "test")
        {
            var secretKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_configuration["Jwt:secret"]));
            var signinCredentials = new SigningCredentials(secretKey, SecurityAlgorithms.HmacSha256);

            var tokeOptions = new JwtSecurityToken(
                issuer: _configuration["Jwt:Issuer"],
                audience: _configuration["Jwt:Audience"],
                claims: new List<Claim>(),
                expires: DateTime.Now.AddDays(1),
                signingCredentials: signinCredentials
            );

            var tokenString = new JwtSecurityTokenHandler().WriteToken(tokeOptions);
            return Ok(new { Token = tokenString });
        }

        return BadRequest("Invalid username or password");
    }
}