public async Task <IResponseEnvelope <UserToken> > AuthenticateAsync(string login, string senha) { if (login == null || senha == null) { return(ResponseEnvelope.CreateErrorResponseEnvelope <UserToken>(ValidationMessageHelper.CreateErrorMessage(ValidationMessages.MISSING_FIELDS))); } var userCredentials = await userTokenRepository.SearchAsync(login); if (userCredentials == null || userCredentials.Password != securityHelper.SHA256(senha)) { return(ResponseEnvelope.CreateErrorResponseEnvelope <UserToken>(ValidationMessageHelper.CreateErrorMessage(ValidationMessages.INVALID_LOGIN))); } var userToken = new UserToken { CreateDate = DateTime.Now, ModifyDate = DateTime.Now, IsValid = true, UserId = userCredentials.Id, Token = securityHelper.GenerateUniqueToken(), Email = userCredentials.Email }; await userTokenRepository.DeleteByEmailAsync(login); await userTokenRepository.InsertToken(userToken); return(ResponseEnvelope.CreateResponseEnvelope(userToken)); }