public static void Serialize(AttemptToken token, Stream stream)
{
using (BinaryWriter writer = new BinaryWriter(stream))
{
writer.Write(token.InterviewQuestionID.ToByteArray(), 0, 16);
writer.Write(token.Random);
writer.Write(token.MostRecentAttemptID.ToByteArray(), 0, 16);
}
}
public static void Serialize(AttemptToken token, Stream stream)
{
using (BinaryWriter writer = new BinaryWriter(stream))
{
writer.Write(token.InterviewQuestionID.ToByteArray(), 0, 16);
writer.Write(token.Random);
writer.Write(token.MostRecentAttemptID.ToByteArray(), 0, 16);
}
}
private static void ValidateAttemptToken(DbContext context, Guid interviewQuestionId, AttemptToken attemptToken, InterviewToken interviewToken)
{
if (attemptToken.InterviewQuestionID != interviewQuestionId)
{
throw new Common.Exceptions.ValidationException("Please download the input file again.");
}
Guid mostRecentAttemptId = context.Attempts
.Where(a => a.InterviewQuestionID == interviewQuestionId)
.OrderByDescending(a => a.CreatedDate)
.Select(a => a.ID)
.FirstOrDefault();
if (attemptToken.MostRecentAttemptID != mostRecentAttemptId)
{
throw new Common.Exceptions.ValidationException("Please download the input file again.");
}
}
public CreateAttemptTokenResponse CreateAttemptToken(CreateAttemptTokenRequest request)
{
CreateAttemptTokenResponse response = new CreateAttemptTokenResponse();
try
{
Common.Helpers.ValidationHelper.ValidateRequiredField(request.Token, "Token");
InterviewToken token = InterviewToken.FromBytes(EncryptionHelper.DecryptURL(Convert.FromBase64String(request.Token)));
DbContext context = DataController.CreateDbContext();
long randomizer = Common.Helpers.RandomHelper.RandomLong();
Guid mostRecentAttemptId = context.Attempts
.Where(a => a.InterviewQuestionID == request.QuestionID)
.OrderByDescending(a => a.CreatedDate)
.Select(a => a.ID)
.FirstOrDefault();
AttemptToken attemptToken = new AttemptToken(request.QuestionID, randomizer, mostRecentAttemptId);
response.AttemptToken = Convert.ToBase64String(EncryptionHelper.EncryptToken(attemptToken.AsBytes()));
}
catch (AuthenticationException ex)
{
throw new WebFaultException<string>(ex.Message, System.Net.HttpStatusCode.BadRequest);
}
catch (Common.Exceptions.ValidationException ex)
{
throw new WebFaultException<string>(ex.Message, System.Net.HttpStatusCode.BadRequest);
}
catch (Exception ex)
{
ExceptionHelper.Log(ex, null);
throw new WebFaultException<string>("An unknown error has occurred.", System.Net.HttpStatusCode.InternalServerError);
}
return response;
}
private static E::Attempt CreateAttempt(Guid interviewQuestionId, string code, string output, AttemptToken attemptToken)
{
E::Attempt attempt = new E::Attempt();
attempt.ID = Guid.NewGuid();
attempt.InterviewQuestionID = interviewQuestionId;
attempt.Code = Guid.NewGuid();
attempt.Output = Guid.NewGuid();
attempt.CreatedBy = string.Empty;
attempt.LastUpdatedBy = string.Empty;
attempt.CreatedDate = DateTime.UtcNow;
attempt.LastUpdatedDate = DateTime.UtcNow;
attempt.Randomizer = attemptToken.Random;
DataController.UploadBlob(attempt.Code.ToString(), code);
DataController.UploadBlob(attempt.Output.ToString(), output);
return attempt;
}