/// <summary>
/// Delete the score from the consumer database.
/// </summary>
/// <param name="lisResultSourcedId">The SourcedId of the score to delete.</param>
/// <returns>True if the score is deleted.</returns>
protected override bool DeleteResult(string lisResultSourcedId)
{
// Only valid SourcedId values are "1", "2", and "3" (see Lti1Controller)
if (lisResultSourcedId.Equals("1") || lisResultSourcedId.Equals("2") || lisResultSourcedId.Equals("3"))
{
_lisResult = null;
return true;
}
return false;
}
/// <summary>
/// Store the score in the consumer database.
/// </summary>
/// <param name="result">The LisResult to store.</param>
/// <returns>True if the score is saved.</returns>
protected override bool ReplaceResult(LisResult result)
{
if (_lisResult == null)
{
_lisResult = new LisResult();
}
_lisResult.IsValid = true;
_lisResult.Score = result.Score;
_lisResult.SourcedId = result.SourcedId;
return true;
}
/// <summary>
/// Store the score in the consumer database.
/// </summary>
/// <param name="result">The LisResult to store.</param>
/// <returns>True if the score is saved.</returns>
protected override bool ReplaceResult(LisResult result)
{
// Only valid SourcedId values are "1", "2", and "3" (see Lti1Controller)
if (result.SourcedId.Equals("1") || result.SourcedId.Equals("2") || result.SourcedId.Equals("3"))
{
if (_lisResult == null)
{
_lisResult = new LisResult();
}
_lisResult.IsValid = true;
_lisResult.Score = result.Score;
_lisResult.SourcedId = result.SourcedId;
return true;
}
return false;
}
/// <summary>
/// Delete the score from the consumer database.
/// </summary>
/// <param name="lisResultSourcedId">The SourcedId of the score to delete.</param>
/// <returns>True if the score is deleted.</returns>
protected override bool DeleteResult(string lisResultSourcedId)
{
_lisResult = null;
return true;
}
/// <summary> /// Save or update the result (grade, score, outcome) in the consumer. /// </summary> /// <param name="result">The result to save or update.</param> /// <returns>True if the result was saved or updated.</returns> protected abstract bool ReplaceResult(LisResult result);
/// <summary>
/// Convert the ResultRecordType into the Result type.
/// </summary>
/// <param name="resultRecord">The ResultRecordType which
/// specifies the assignment and score.</param>
/// <returns>The corresponding Result</returns>
private static LisResult GetResult(ResultRecordType resultRecord)
{
var result = new LisResult { SourcedId = resultRecord.sourcedGUID.sourcedId };
if (resultRecord.result != null)
{
// The LTI 1.1 specification states in 6.1.1. that the score in replaceResult should
// always be formatted using “en” formatting
// (http://www.imsglobal.org/LTI/v1p1p1/ltiIMGv1p1p1.html#_Toc330273034).
const NumberStyles style = NumberStyles.Number | NumberStyles.AllowDecimalPoint;
var culture = CultureInfo.CreateSpecificCulture(LtiConstants.ScoreLanguage);
double value;
if (double.TryParse(resultRecord.result.resultScore.textString, style, culture, out value))
{
if (value >= 0 && value <= 1)
{
result.Score = value;
}
}
}
return result;
}
/// <summary>
/// Fill the Result with corresponding Score data.
/// </summary>
/// <param name="lisResultSourcedId">The sourcedId of the LisResult to read.</param>
/// <returns>True if the Score was found and the Result is valid.</returns>
protected override LisResult ReadResult(string lisResultSourcedId)
{
var score = GetScore(lisResultSourcedId);
var result = new LisResult();
if (score.IsValid)
{
result.IsValid = true;
result.Score = score.Score == null ? default(double?) : score.Score.DoubleValue;
result.SourcedId = lisResultSourcedId;
}
else
{
result.IsValid = false;
}
return result;
}
/// <summary>
/// Create a new Score based on the Result that was sent.
/// </summary>
/// <param name="result">The result record that was sent in the request.</param>
/// <returns>The Score based on the result.</returns>
private static Score CreateScore(LisResult result)
{
var sourcedId = JsonConvert.DeserializeObject<LisResultSourcedId>(result.SourcedId);
return new Score
{
AssignmentId = sourcedId.AssignmentId,
UserId = sourcedId.UserId
};
}
/// <summary>
/// Create or update a Score with the LTI result.
/// </summary>
/// <param name="result">The LTI result.</param>
/// <returns>True if the Score was created or updated.</returns>
protected override bool ReplaceResult(LisResult result)
{
var score = GetScore(result.SourcedId);
if (score.IsValid)
{
if (score.Score == null)
{
score.Score = CreateScore(result);
ConsumerContext.Scores.Add(score.Score);
}
if (result.Score.HasValue)
{
score.Score.DoubleValue = result.Score.Value;
}
ConsumerContext.SaveChanges();
return true;
}
return false;
}
