public string Authenticate(LoginRequest request)
{
var appUser = _users.SingleOrDefault(x => x.Username == request.Username && x.Password == request.Password);
//return null if user is not available
if (appUser == null)
{
return(null);
}
//generate jwt token
var token = _jwtProvider.generateJwtToken(appUser.UserRole);
return(token);
}