public static async Task<BasicResult> DeleteScoreAsync(string serviceUrl, string consumerKey, string consumerSecret, string lisResultSourcedId) { var imsxEnvelope = new imsx_POXEnvelopeType { imsx_POXHeader = new imsx_POXHeaderType {Item = new imsx_RequestHeaderInfoType()}, imsx_POXBody = new imsx_POXBodyType {Item = new deleteResultRequest()} }; var imsxHeader = (imsx_RequestHeaderInfoType) imsxEnvelope.imsx_POXHeader.Item; imsxHeader.imsx_version = imsx_GWSVersionValueType.V10; imsxHeader.imsx_messageIdentifier = Guid.NewGuid().ToString(); var imsxBody = (deleteResultRequest) imsxEnvelope.imsx_POXBody.Item; imsxBody.resultRecord = new ResultRecordType { sourcedGUID = new SourcedGUIDType {sourcedId = lisResultSourcedId} }; try { var webRequest = CreateLtiOutcomesRequest( imsxEnvelope, serviceUrl, consumerKey, consumerSecret); var webResponse = await webRequest.GetResponseAsync(); return ParseDeleteResultResponse(webResponse); } catch (Exception ex) { return new BasicResult(false, ex.ToString()); } }
public static async Task <BasicResult> PostScoreAsync(string serviceUrl, string consumerKey, string consumerSecret, string lisResultSourcedId, double?score) { var imsxEnvelope = new imsx_POXEnvelopeType { imsx_POXHeader = new imsx_POXHeaderType { Item = new imsx_RequestHeaderInfoType() }, imsx_POXBody = new imsx_POXBodyType { Item = new replaceResultRequest() } }; var imsxHeader = (imsx_RequestHeaderInfoType)imsxEnvelope.imsx_POXHeader.Item; imsxHeader.imsx_version = imsx_GWSVersionValueType.V10; imsxHeader.imsx_messageIdentifier = Guid.NewGuid().ToString(); var imsxBody = (replaceResultRequest)imsxEnvelope.imsx_POXBody.Item; imsxBody.resultRecord = new ResultRecordType { sourcedGUID = new SourcedGUIDType { sourcedId = lisResultSourcedId }, result = new ResultType { resultScore = new TextType { language = LtiConstants.ScoreLanguage, textString = score?.ToString(new CultureInfo(LtiConstants.ScoreLanguage)) } } }; // 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). try { var webRequest = CreateLtiOutcomesRequest( imsxEnvelope, serviceUrl, consumerKey, consumerSecret); using (var webResponse = await webRequest.GetResponseAsync()) { return(ParsePostResultResponse(webResponse)); } } catch (Exception ex) { return(new BasicResult(false, ex.ToString())); } }
private static HttpWebRequest CreateLtiOutcomesRequest(imsx_POXEnvelopeType imsxEnvelope, string url, string consumerKey, string consumerSecret) { var webRequest = (HttpWebRequest)WebRequest.Create(url); webRequest.Method = "POST"; webRequest.ContentType = "application/xml"; var parameters = new NameValueCollection(); parameters.AddParameter(OAuthConstants.ConsumerKeyParameter, consumerKey); parameters.AddParameter(OAuthConstants.NonceParameter, Guid.NewGuid().ToString()); parameters.AddParameter(OAuthConstants.SignatureMethodParameter, OAuthConstants.SignatureMethodHmacSha1); parameters.AddParameter(OAuthConstants.VersionParameter, OAuthConstants.Version10); // Calculate the timestamp var ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0); var timestamp = Convert.ToInt64(ts.TotalSeconds); parameters.AddParameter(OAuthConstants.TimestampParameter, timestamp); // Calculate the body hash using (var ms = new MemoryStream()) using (var sha1 = new SHA1CryptoServiceProvider()) { ImsxRequestSerializer.Serialize(ms, imsxEnvelope); ms.Position = 0; ms.CopyTo(webRequest.GetRequestStream()); var hash = sha1.ComputeHash(ms.ToArray()); var hash64 = Convert.ToBase64String(hash); parameters.AddParameter(OAuthConstants.BodyHashParameter, hash64); } // Calculate the signature var signature = OAuthUtility.GenerateSignature(webRequest.Method, webRequest.RequestUri, parameters, consumerSecret); parameters.AddParameter(OAuthConstants.SignatureParameter, signature); // Build the Authorization header var authorization = new StringBuilder(OAuthConstants.AuthScheme).Append(" "); foreach (var key in parameters.AllKeys) { authorization.AppendFormat("{0}=\"{1}\",", key, WebUtility.UrlEncode(parameters[key])); } webRequest.Headers["Authorization"] = authorization.ToString(0, authorization.Length - 1); return(webRequest); }
public static LisResult ReadScore(string serviceUrl, string consumerKey, string consumerSecret, string lisResultSourcedId) { var imsxEnvelope = new imsx_POXEnvelopeType { imsx_POXHeader = new imsx_POXHeaderType { Item = new imsx_RequestHeaderInfoType() }, imsx_POXBody = new imsx_POXBodyType { Item = new readResultRequest() } }; var imsxHeader = (imsx_RequestHeaderInfoType)imsxEnvelope.imsx_POXHeader.Item; imsxHeader.imsx_version = imsx_GWSVersionValueType.V10; imsxHeader.imsx_messageIdentifier = Guid.NewGuid().ToString(); var imsxBody = (readResultRequest)imsxEnvelope.imsx_POXBody.Item; imsxBody.resultRecord = new ResultRecordType { sourcedGUID = new SourcedGUIDType { sourcedId = lisResultSourcedId } }; try { var webRequest = CreateLtiOutcomesRequest( imsxEnvelope, serviceUrl, consumerKey, consumerSecret); var webResponse = webRequest.GetResponse() as HttpWebResponse; return(ParseReadResultResponse(webResponse)); } catch (Exception ex) { return(new LisResult { IsValid = false, Message = ex.ToString() }); } }