public async Task <User> RegisterUser(User user)
{
// password validation
if (string.IsNullOrWhiteSpace(user.Password) || user.Password.Length < 8)
{
throw new Exception("The password provided is not valid.");
}
// username validation
Regex userNameRegex = new Regex("[a-zA-Z0-9]+");
if (string.IsNullOrWhiteSpace(user.Username) || !userNameRegex.IsMatch(user.Username))
{
throw new Exception("Username is not valid, it should only contain alphanumeric characters.");
}
// email validation
Regex emailRegex = new Regex(@"[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", RegexOptions.IgnoreCase);
if (string.IsNullOrWhiteSpace(user.Email) || !emailRegex.IsMatch(user.Email))
{
throw new Exception("Please provide a valid email address.");
}
if (_timeTrackerContext.Users.Count() > 0)
{
User sameUser = null;
// find if a user exists with the same user name
sameUser = await _timeTrackerContext.Users.FirstOrDefaultAsync(x => x.Username == user.Username);
if (sameUser != null)
{
throw new Exception("A user with the same username already exists.");
}
// find if a user exists with the same email
sameUser = await _timeTrackerContext.Users.FirstOrDefaultAsync(x => x.Email == user.Email);
if (sameUser != null)
{
throw new Exception("A user with the same email already exists.");
}
}
// password hash generation
user.PasswordKey = GeneratePasswordKey();
// password hash
user.Password = HashPassword(user.Password, user.PasswordKey);
// save the user
var addedUser = await _timeTrackerContext.AddAsync(user);
await _timeTrackerContext.SaveChangesAsync();
addedUser.Entity.Password = null;
addedUser.Entity.PasswordKey = null;
// return the user
return(addedUser.Entity);
}