TourIAm/TIAMWebApp/Server/Controllers/UserAPIController.cs

using DevExpress.Office.Crypto;
using DevExpress.Xpo.DB;
using DevExpress.XtraPrinting;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json.Linq;
using Microsoft.IdentityModel.Tokens;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Security.Cryptography;
using System.Text.Json;
using TIAMWebApp.Shared.Application.Models;
using TIAMWebApp.Shared.Application.Models.PageModels;
using TIAMWebApp.Server.Models;
using System.Text;
using Microsoft.AspNetCore.Hosting;
using TIAMWebApp.Server.ModelsTIAMWebApp.Shared.Application.Models;

namespace TIAMWebApp.Server.Controllers
{
    [Authorize]
    [ApiController]
    [Route("api/[controller]")]
    public class UserAPIController : ControllerBase
    {
        private readonly IConfiguration _configuration;
        private readonly IWebHostEnvironment _webHostEnvironment;
        PasswordHasher hasher = new PasswordHasher();
        

        private User[] users = new User[]
        {
            new User(new Guid("540271f6-c604-4c16-8160-d5a7cafedf00"), "test@tiam.hu", "+36701234567", "Asdasd123456"),
            new User(new Guid("4cbaed43-2465-4d99-84f1-c8bc6b7025f7"), "adam@tiam.hu", "+36701234567", "Asdasd987654")
            
        };

        private readonly ILogger<UserAPIController> _logger;

        public UserAPIController(ILogger<UserAPIController> logger, IConfiguration configuration, IWebHostEnvironment webHostEnvironment)
        {
            _logger = logger;
            _configuration = configuration;
            _webHostEnvironment = webHostEnvironment;            
        }


        /*[HttpPost]
        [Route("Auth")]
        public async Task<IActionResult> AuthenticateUser([FromBody] JsonElement SerializedLoginModel)
        {
            Console.WriteLine("Auth called");
            Console.WriteLine(SerializedLoginModel.GetRawText());
            if (string.IsNullOrEmpty(SerializedLoginModel.GetRawText()))
            {
                return BadRequest("SerializedLoginModel is required");
            }
            else
            {
                var user = JObject.Parse(SerializedLoginModel.GetRawText()).ToObject<LoginModel>();
                
                Console.WriteLine(user.Email);
                Console.WriteLine(user.Password);

                if (user.Email == "test@tiam.hu" && user.Password == "Asdasd123456")
                {
                    Console.WriteLine("User authenticated");
                    return Ok("yes");
                }
                else
                {
                    Console.WriteLine("User NOT authenticated");
                    return Ok("no");
                }
            }
            
        }*/

        [AllowAnonymous]
        [HttpPost("AuthenticateUser")]
        public async Task<IActionResult> AuthenticateUser([FromBody] JsonElement SerializedLoginModel)
        {
            
            var authenticateUser = JObject.Parse(SerializedLoginModel.GetRawText()).ToObject<LoginModel>();

            //check if user exists
            //var user = await _userManager.FindByNameAsync(authenticateUser.UserName);
            //if (user == null) return Unauthorized();

            //mocking
            var user = users.FirstOrDefault(x => x.Email == authenticateUser.Email);

            //check if password is valid
            //bool isValidUser = await _userManager.CheckPasswordAsync(user, authenticateUser.Password);

            //mocking
            bool isValidUser = false;

            if (user.Password == authenticateUser.Password)
            {
                isValidUser = true;

            }

            if (isValidUser)
            {
                Console.WriteLine("User authenticated, let's start JWT");
                string accessToken = GenerateAccessToken(user);
                Console.WriteLine("Generate refresh token");
                var refreshToken = GenerateRefreshToken();
                user.RefreshToken = refreshToken;
                //Update user with refreshToken!!
                //await _userManager.UpdateAsync(user);

                var response = new MainResponse
                {
                    Content = new AuthenticationResponse
                    {
                        RefreshToken = refreshToken,
                        AccessToken = accessToken
                    },
                    IsSuccess = true,
                    ErrorMessage = ""
                };
                return Ok(response);
            }
            else
            {
                return Unauthorized();
            }

        }

        private string GenerateAccessToken(User user)
        {
            var tokenHandler = new JwtSecurityTokenHandler();
            var token = new JwtSecurityToken();
            Console.WriteLine("----------------------------------------------------------");
            var keyDetail = Encoding.UTF8.GetBytes(_configuration["JWT:Key"]);
            Console.WriteLine(_configuration["JWT:Key"]);

            var claims = new List<Claim>
            {
                new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()),
                new Claim(ClaimTypes.Email, user.Email)                    
            };

            var tokenDescriptor = new SecurityTokenDescriptor
            {
                Audience = _configuration["JWT:Audience"],
                Issuer = _configuration["JWT:Issuer"],
                Expires = DateTime.UtcNow.AddMinutes(30),
                Subject = new ClaimsIdentity(claims),
                SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(keyDetail), SecurityAlgorithms.HmacSha256Signature)
            };
            token = tokenHandler.CreateToken(tokenDescriptor) as JwtSecurityToken;
            string writtenToken = tokenHandler.WriteToken(token);
            Console.WriteLine(writtenToken);
            return writtenToken;
        }

        [AllowAnonymous]
        [HttpPost("RefreshToken")]
        public async Task<IActionResult> RefreshToken(RefreshTokenRequest refreshTokenRequest)
        {
            var response = new MainResponse();
            if (refreshTokenRequest is null)
            {
                response.ErrorMessage = "Invalid  request";
                return BadRequest(response);
            }

            var principal = GetPrincipalFromExpiredToken(refreshTokenRequest.AccessToken);

            if (principal != null)
            {
                var email = principal.Claims.FirstOrDefault(f => f.Type == ClaimTypes.Email);

                //var user = await _userManager.FindByEmailAsync(email?.Value);
                var user = users.FirstOrDefault(x => x.Email == email?.Value);


                if (user is null || user.RefreshToken != refreshTokenRequest.RefreshToken)
                {
                    response.ErrorMessage = "Invalid Request";
                    return BadRequest(response);
                }

                string newAccessToken = GenerateAccessToken(user);
                string refreshToken = GenerateRefreshToken();
                
                //mocking - update user with new refreshToken
                user.RefreshToken = refreshToken;
                //await _userManager.UpdateAsync(user);

                response.IsSuccess = true;
                response.Content = new AuthenticationResponse
                {
                    RefreshToken = refreshToken,
                    AccessToken = newAccessToken
                };
                return Ok(response);
            }
            else
            {
                return NotFound("Invalid Token Found");
            }

        }

        private ClaimsPrincipal GetPrincipalFromExpiredToken(string token)
        {
            var tokenHandler = new JwtSecurityTokenHandler();

            var keyDetail = Encoding.UTF8.GetBytes(_configuration["JWT:Key"]);

            var tokenValidationParameter = new TokenValidationParameters
            {
                ValidateIssuer = false,
                ValidateAudience = false,
                ValidateLifetime = false,
                ValidateIssuerSigningKey = true,
                ValidIssuer = _configuration["JWT:Issuer"],
                ValidAudience = _configuration["JWT:Audience"],
                IssuerSigningKey = new SymmetricSecurityKey(keyDetail),
            };

            SecurityToken securityToken;
            var principal = tokenHandler.ValidateToken(token, tokenValidationParameter, out securityToken);
            var jwtSecurityToken = securityToken as JwtSecurityToken;
            if (jwtSecurityToken == null || !jwtSecurityToken.Header.Alg.Equals(SecurityAlgorithms.HmacSha256, StringComparison.InvariantCultureIgnoreCase))
                throw new SecurityTokenException("Invalid token");
            return principal;
        }

        private string GenerateRefreshToken()
        {

            var randomNumber = new byte[32];
            using (var rng = RandomNumberGenerator.Create())
            {
                rng.GetBytes(randomNumber);
                return Convert.ToBase64String(randomNumber);
            }
        }



        [HttpPost]
        [Route("CreateUser")]
        public async Task<IActionResult> CreateUser([FromBody] JsonElement SerializedRegistrationModel)
        {
            if (string.IsNullOrEmpty(SerializedRegistrationModel.GetRawText()))
            {
                return BadRequest("SerializedLoginModel is required");
            }
            else
            {
                var user = JObject.Parse(SerializedRegistrationModel.GetRawText()).ToObject<RegistrationModel>();

                if (users != null)
                {
                    //add user to users array
                    Array.Resize(ref users, users.Length + 1);
                    users[users.Length - 1] = new User(user.Email, user.PhoneNumber, user.Password);
                    return Ok("yes");
                }
                else
                {
                    return Ok("no");
                }

            }

            
        }

        [HttpPost]
        [Route("Test1")]
        public async Task<IActionResult> TestEndpoint([FromBody] int testParam)
        {            
            return Ok(testParam.ToString());

        }
        [HttpGet]
        [Route("Test2")]
        public string TestEndpoint2(int testParam)
        {
            return testParam.ToString();

        }


        [HttpGet]
        [Route("GetUsers")]
        public IEnumerable<Supplier> GetUsers()
        {
            throw new NotImplementedException();
        }

        private bool VerifyPassword(string password, string hashedPassword)
        {
            bool isPasswordValid = hasher.VerifyPassword(password, hashedPassword);
            return isPasswordValid;
        }

        private string HashPassword(string password)
        {
            var hashedPassword = hasher.HashPassword(password);
            return hashedPassword;
        }
    }
}