save OHIFVIewer length as SR

stowSR.js

// This can be pasted into the wip-add-dcmjs branch of git@github.com:ohif/Viewers
// to store current length measurements back to the source DICOMweb server.

function parametersFromImageId(imageId) {
  const decodedImageId = decodeURIComponent(imageId);
  return(new URLSearchParams(decodedImageId));
}

function parametersFromToolState() {
  const imageToolState = cornerstoneTools.globalImageIdSpecificToolStateManager.saveToolState();

  const imageId0 = Object.keys(imageToolState)[0];
  return parametersFromImageId(imageId0);
}

function srFromToolState() {

  const parameters = parametersFromToolState();

  // TODO: figure out what is needed to make a dcmjs dataset from
  // information available in the viewer.  Apparently the raw dicom is not available
  // directly.
  const derivationSourceDataset = {
    StudyInstanceUID: parameters.get('studyUID'),
    SeriesInstanceUID: parameters.get('seriesUID'),
    SOPInstanceUID: parameters.get('objectUID'),
    SOPClassUID: dcmjs.data.DicomMetaDictionary.sopClassUIDsByName["CTImage"], // TODO: so everything is a CT for now...
  };
  report = new dcmjs.derivations.StructuredReport([derivationSourceDataset]);
  dataset = report.dataset;

  // TODO: what is the correct metaheader
  // http://dicom.nema.org/medical/Dicom/current/output/chtml/part10/chapter_7.html
  // TODO: move meta creation to dcmjs
  const fileMetaInformationVersionArray = new Uint16Array(1);
  fileMetaInformationVersionArray[0] = 1;
  report.dataset._meta = {
    FileMetaInformationVersion: fileMetaInformationVersionArray.buffer,
    MediaStorageSOPClassUID: dataset.SOPClassUID,
    MediaStorageSOPInstanceUID: dataset.SOPInstanceUID,
    TransferSyntaxUID: "1.2.840.10008.1.2.1", // Explicit little endian (always for dcmjs?)
    ImplementationClassUID: dcmjs.data.DicomMetaDictionary.uid(), // TODO: could be git hash or other valid id
    ImplementationVersionName: "OHIFViewer",
  };

  // TODO: factor out a lot of this back into dcmjs for use in both
  // the example and in the Viewer
  var measurementGroupContentSequence = [];

  // TODO: make a TID1550 derivation as an SR subclass
  dataset.ConceptNameCodeSequence = {
    CodeValue: '126000',
    CodingSchemeDesignator: 'DCM',
    CodeMeaning: 'Imaging Measurement Report',
  };
  dataset.ContinuityOfContent = 'SEPARATE';
  dataset.PerformedProcedureCodeSequence = [];
  dataset.CompletionFlag = 'COMPLETE';
  dataset.VerificationFlag = 'UNVERIFIED';
  dataset.ReferencedPerformedProcedureStepSequence = [];
  dataset.InstanceNumber = 1;
  dataset.CurrentRequestedProcedureEvidenceSequence = {
    StudyInstanceUID: dataset.StudyInstanceUID,
    ReferencedSeriesSequence: {
      SeriesInstanceUID: dataset.SeriesInstanceUID,
      ReferencedSOPSequence: {
        ReferencedSOPClassUID: derivationSourceDataset.SOPClassUID,
        ReferencedSOPInstanceUID: derivationSourceDataset.SOPInstanceUID,
      },
    },
  };
  dataset.CodingSchemeIdentificationSequence = {
    CodingSchemeDesignator: "99dcmjs",
    CodingSchemeName: "Codes used for dcmjs",
    CodingSchemeVersion: "0",
    CodingSchemeResponsibleOrganization: "https://github.com/pieper/dcmjs",
  };

  dataset.ContentTemplateSequence = {
    MappingResource: 'DCMR',
    TemplateIdentifier: '1500',
  };

  dataset.ContentSequence = [
    {
      RelationshipType: 'HAS CONCEPT MOD',
      ValueType: 'CODE',
      ConceptNameCodeSequence: {
        CodeValue: '121049',
        CodingSchemeDesignator: 'DCM',
        CodeMeaning: 'Language of Content Item and Descendants',
      },
      ConceptCodeSequence: {
        CodeValue: 'eng',
        CodingSchemeDesignator: 'RFC3066',
        CodeMeaning: 'English',
      },
      ContentSequence: {
        RelationshipType: 'HAS CONCEPT MOD',
        ValueType: 'CODE',
        ConceptNameCodeSequence: {
          CodeValue: '121046',
          CodingSchemeDesignator: 'DCM',
          CodeMeaning: 'Country of Language',
        },
        ConceptCodeSequence: {
          CodeValue: 'US',
          CodingSchemeDesignator: 'ISO3166_1',
          CodeMeaning: 'United States',
        },
      },
    },
    {
      RelationshipType: 'HAS OBS CONTEXT',
      ValueType: 'PNAME',
      ConceptNameCodeSequence: {
        CodeValue: '121008',
        CodingSchemeDesignator: 'DCM',
        CodeMeaning: 'Person Observer Name',
      },
      PersonName: 'user^web', // TODO: these can be options argument for constructor
    },
    {
      RelationshipType: 'HAS OBS CONTEXT',
      ValueType: 'TEXT',
      ConceptNameCodeSequence: {
        CodeValue: 'RP-100006',
        CodingSchemeDesignator: '99dcmjs',
        CodeMeaning: "Person Observer's Login Name",
      },
      TextValue: 'user',
    },
    {
      RelationshipType: 'HAS CONCEPT MOD',
      ValueType: 'CODE',
      ConceptNameCodeSequence: {
        CodeValue: '121058',
        CodingSchemeDesignator: 'DCM',
        CodeMeaning: 'Procedure reported',
      },
      ConceptCodeSequence: {
        CodeValue: '1',
        CodingSchemeDesignator: '99dcmjs',
        CodeMeaning: 'Unknown procedure',
      },
    },
    {
      RelationshipType: 'CONTAINS',
      ValueType: 'CONTAINER',
      ConceptNameCodeSequence: {
        CodeValue: '111028',
        CodingSchemeDesignator: 'DCM',
        CodeMeaning: 'Image Library',
      },
      ContinuityOfContent: 'SEPARATE',
      ContentSequence: {
        RelationshipType: 'CONTAINS',
        ValueType: 'CONTAINER',
        ConceptNameCodeSequence: {
          CodeValue: '126200',
          CodingSchemeDesignator: 'DCM',
          CodeMeaning: 'Image Library Group',
        },
        ContinuityOfContent: 'SEPARATE',
        ContentSequence: {
          RelationshipType: 'CONTAINS',
          ValueType: 'IMAGE',
          ReferencedSOPSequence: {
            // TODO: this should refer to the UIDs extracted from the toolState / instance info
            ReferencedSOPClassUID: dataset.SOPClassUID,
            ReferencedSOPInstanceUID: dataset.SOPInstanceUID,
          },
        },
      },
    },
    {
      RelationshipType: 'CONTAINS',
      ValueType: 'CONTAINER',
      ConceptNameCodeSequence: {
        CodeValue: '126010',
        CodingSchemeDesignator: 'DCM',
        CodeMeaning: 'Imaging Measurements',  // TODO: would be nice to abstract the code sequences (in a dictionary? a service?)
      },
      ContinuityOfContent: 'SEPARATE',
      ContentSequence: {
        RelationshipType: 'CONTAINS',
        ValueType: 'CONTAINER',
        ConceptNameCodeSequence: {
          CodeValue: '125007',
          CodingSchemeDesignator: 'DCM',
          CodeMeaning: 'Measurement Group',
        },
        ContinuityOfContent: 'SEPARATE',
        ContentSequence: measurementGroupContentSequence,
      },
    },
  ];

  var measurementGroupContentItem = function(ReferencedSOPInstanceUID, handles, distance, frame) {
    return ([
      {
        RelationshipType: 'HAS OBS CONTEXT',
        ValueType: 'TEXT',
        ConceptNameCodeSequence: {
          CodeValue: '112039',
          CodingSchemeDesignator: 'DCM',
          CodeMeaning: 'Tracking Identifier',
        },
        TextValue: 'web annotation',
      },
      {
        RelationshipType: 'HAS OBS CONTEXT',
        ValueType: 'UIDREF',
        ConceptNameCodeSequence: {
          CodeValue: '112040',
          CodingSchemeDesignator: 'DCM',
          CodeMeaning: 'Tracking Unique Identifier',
        },
        UID: dcmjs.data.DicomMetaDictionary.uid(),
      },
      {
        RelationshipType: 'CONTAINS',
        ValueType: 'CODE',
        ConceptNameCodeSequence: {
          CodeValue: '121071',
          CodingSchemeDesignator: 'DCM',
          CodeMeaning: 'Finding',
        },
        ConceptCodeSequence: {
          CodeValue: 'SAMPLEFINDING',
          CodingSchemeDesignator: '99dcmjs',
          CodeMeaning: 'Sample Finding',
        },
      },
      {
        RelationshipType: 'CONTAINS',
        ValueType: 'NUM',
        ConceptNameCodeSequence: {
          CodeValue: 'G-D7FE',
          CodingSchemeDesignator: 'SRT',
          CodeMeaning: 'Length',
        },
        MeasuredValueSequence: {
          MeasurementUnitsCodeSequence: {
            CodeValue: 'mm',
            CodingSchemeDesignator: 'UCUM',
            CodingSchemeVersion: '1.4',
            CodeMeaning: 'millimeter',
          },
          NumericValue: distance,
        },
        ContentSequence: {
          RelationshipType: 'INFERRED FROM',
          ValueType: 'SCOORD',
          GraphicType: 'POLYLINE',
          GraphicData: [ handles.start.x, handles.start.y, handles.end.x, handles.end.y ],
          ContentSequence: {
            RelationshipType: 'SELECTED FROM',
            ValueType: 'IMAGE',
            ReferencedSOPSequence: {
              ReferencedSOPClassUID: derivationSourceDataset.SOPClassUID,
              ReferencedSOPInstanceUID: ReferencedSOPInstanceUID,
              ReferencedFrameNumber: frame,
            }
          },
        },
      },
    ]);
  }

  const imageToolState = cornerstoneTools.globalImageIdSpecificToolStateManager.saveToolState();
  Object.keys(imageToolState).forEach(function(imageId) {
    if (imageToolState[imageId]) {
      imageToolState[imageId].length.data.forEach(function(length) {

        let handles = length.handles;
        //let frame = Number(imageId.slice(imageId.lastIndexOf('frame')).split('=')[1]); // TODO: frame is explicit somewhere?

        imageParameters = parametersFromImageId(imageId);
        let ReferencedInstanceUID = imageParameters.get('objectUID');
        let frame = imageParameters.get('frame');

        // extend list in place
        measurementGroupContentSequence.push.apply(measurementGroupContentSequence, measurementGroupContentItem(ReferencedInstanceUID, handles, length.length, frame));
      });
    }
  });

  return(dataset);
}

//
// return a post-able multipart encoded dicom from the blob
//
function multipartEncode(dataset, boundary) {

  const denaturalizedMetaheader = dcmjs.data.DicomMetaDictionary.denaturalizeDataset(dataset._meta);
  const dicomDict = new dcmjs.data.DicomDict(denaturalizedMetaheader);

  dicomDict.dict = dcmjs.data.DicomMetaDictionary.denaturalizeDataset(dataset);

  const part10Buffer = dicomDict.write();

  const header = `\r\n--${boundary}\r\nContent-Type: application/dicom\r\n\r\n`;
  const footer = `\r\n--${boundary}--`;

  const stringToArray = (string) => Uint8Array.from(Array.from(string).map(letter => letter.charCodeAt(0)));

  headerArray = stringToArray(header);
  contentArray = new Uint8Array(part10Buffer);
  footerArray = stringToArray(footer);

  const multipartArray = new Uint8Array(headerArray.length + contentArray.length + footerArray.length);

  multipartArray.set(headerArray, 0);
  multipartArray.set(contentArray, headerArray.length);
  multipartArray.set(footerArray, headerArray.length + contentArray.length);

  return(multipartArray.buffer);
}

function stowSR() {
  const reportDataset = srFromToolState();
  
  console.log(reportDataset);

  const parameters = parametersFromToolState();

  const wadoProxyURLPrefix = "dicomweb:/__wado_proxy?url";
  const wadoURL = parameters.get(wadoProxyURLPrefix);
  const serverId = parameters.get('serverId');
  const aetURLPrefix = wadoURL.slice(0, wadoURL.search('/wado'));
  const stowURL = `${aetURLPrefix}/rs/studies`;

  const boundary = dcmjs.data.DicomMetaDictionary.uid();
  const multipartBuffer = multipartEncode(reportDataset, boundary);

  const wadoProxyURL = `/__wado_proxy?url=${stowURL}&serverId=${serverId}`;

  const stowRequest = new XMLHttpRequest();
  stowRequest.open("POST", wadoProxyURL);
  stowRequest.onload = console.log;
  stowRequest.setRequestHeader(
                'Content-Type',
                `multipart/related; type=application/dicom; boundary=${boundary}`
  );
  stowRequest.send(multipartBuffer);
}

stowSR();