LT-73 Export selected studies from study list to local

- Query to get metadata of the selected studies to export
- Download and zip the queried dicom files
- Show and update the progress dialog while querying and exporting studies

LesionTracker/.meteor/packages

@@ -51,3 +51,4 @@ check
 aldeed:template-extension@4.0.0
 zuuk:stale-session
 gilbertwat:bootstrap3-daterangepicker
+silentcicero:jszip

LesionTracker/.meteor/versions

@@ -97,6 +97,7 @@ rwatts:uuid@0.0.2
 service-configuration@1.0.5
 session@1.1.1
 sha@1.0.4
+silentcicero:jszip@0.0.4
 spacebars@1.0.7
 spacebars-compiler@1.0.7
 srp@1.0.4

Packages/lesiontracker/client/components/lesionTrackerWorklistContextMenu/lesionTrackerWorklistContextMenu.html

@@ -24,7 +24,9 @@
                 </a>
                 <a class="disabled"><i class="fa fa-trash fa-lg"></i> Delete</a>
                 <a class="disabled"><i class="fa fa-send-o fa-lg"></i> Send</a>
-                <a class="disabled"><i class="fa fa-exchange fa-lg"></i> Export</a>
+                <a id="exportSelectedStudies" type="button"
+                   title="Export Selected Studies">
+                   <i class="fa fa-exchange fa-lg"></i> Export</a>
                 <a class="disabled"><i class="fa fa-download fa-lg"></i> Download</a>
                 <a class="disabled"><i class="fa fa-photo fa-lg"></i> View Series Details</a>
             </li>

Packages/lesiontracker/client/components/lesionTrackerWorklistContextMenu/lesionTrackerWorklistContextMenu.js

@@ -5,6 +5,7 @@ var defaultTemplate = 'studyContextMenu';
 Template.lesionTrackerWorklistContextMenu.replaces(defaultTemplate);
 
 Worklist.functions['removeTimepointAssociations'] = removeTimepointAssociations;
+Worklist.functions['exportSelectedStudies'] = exportSelectedStudies;
 
 /**
  * Removes all present study / timepoint associations from the Clinical Trial
@@ -73,3 +74,37 @@ function removeTimepointAssociations() {
         }
     });
 }
+
+/**
+ * Exports all selected studies on the worklist
+ */
+function exportSelectedStudies() {
+    var selectedStudies = WorklistSelectedStudies.find({}, {
+            sort: {
+                studyDate: 1
+            }
+        }).fetch() || [];
+
+    if (selectedStudies.length < 1) {
+        return;
+    }
+
+    var studiesToExport = [];
+    var numberOfStudiesToQuery = selectedStudies.length;
+
+    progressDialog.show("Querying Studies...", numberOfStudiesToQuery);
+
+    selectedStudies.forEach(function(selectedStudy) {
+        getStudyMetadata(selectedStudy.studyInstanceUid, function(study) {
+            studiesToExport.push(study);
+
+            var numberOfStudiesQueried = studiesToExport.length;
+
+            progressDialog.update(numberOfStudiesQueried);
+
+            if (numberOfStudiesQueried === numberOfStudiesToQuery) {
+                exportStudies(studiesToExport);
+            }
+        });
+    });
+}

Packages/lesiontracker/lib/exportStudies.js

@@ -0,0 +1,97 @@
+/**
+ * Exports requested studies
+ * @param studiesToExport Studies to export
+ */
+exportStudies = function(studiesToExport) {
+    var numberOfFilesToExport = getNumberOfFilesToExport(studiesToExport);
+
+    progressDialog.show("Exporting Studies...", numberOfFilesToExport);
+
+    try {
+        exportStudiesInternal(studiesToExport, numberOfFilesToExport);
+    } catch (err) {
+        progressDialog.close();
+        console.error("Failed to export studies: " + err.message);
+    }
+};
+
+function exportStudiesInternal(studiesToExport, numberOfFilesToExport) {
+    var zip = new JSZip();
+
+    var exportFailed = false;
+    var numberOfFilesExported = 0;
+
+    studiesToExport.forEach(function(study) {
+        sortStudy(study);
+
+        var studyFolder = zip.folder(study.studyInstanceUid);
+
+        study.seriesList.forEach(function(series) {
+            var seriesFolder = studyFolder.folder(series.seriesInstanceUid);
+
+            series.instances.forEach(function(instance) {
+                if (!instance.wadouri) {
+                    return;
+                }
+
+                //  If failed to download a dicom file, skip others
+                if (exportFailed) {
+                    return;
+                }
+
+                //  Download and Zip the dicom file
+                var xhr = new XMLHttpRequest();
+                xhr.open("GET", instance.wadouri, true);
+                xhr.responseType = "arraybuffer";
+
+                //  Downloaded the dicom file completely
+                xhr.onload = function() {
+                    //  If failed to download a dicom file, skip others
+                    if (exportFailed) {
+                        return;
+                    }
+
+                    var responseArrayBuffer = xhr.response;
+                    if (responseArrayBuffer) {
+                        seriesFolder.file(instance.sopInstanceUid + ".dcm", responseArrayBuffer, { binary: true });
+                    }
+
+                    numberOfFilesExported++;
+
+                    if (numberOfFilesExported === numberOfFilesToExport) {
+                        var zipContent = zip.generate({ type: "blob" });
+                        saveAs(zipContent, "studies.zip");
+                    }
+
+                    progressDialog.update(numberOfFilesExported);
+                };
+
+                //  Failed to download the dicom file
+                xhr.onerror = function() {
+                    exportFailed = true;
+
+                    progressDialog.close();
+                    console.error("Failed to export studies!");
+                };
+
+                xhr.send(null);
+            });
+        });
+    });
+}
+
+function getNumberOfFilesToExport(studiesToExport) {
+    var numberOFFilesToExport = 0;
+
+    studiesToExport.forEach(function(study) {
+        study.seriesList.forEach(function(series) {
+            series.instances.forEach(function(instance) {
+                if (instance.wadouri) {
+                    numberOFFilesToExport++;
+                }
+            });
+        });
+    });
+
+    return numberOFFilesToExport;
+}

Packages/lesiontracker/package.js

@@ -169,6 +169,8 @@ Package.onUse(function(api) {
     api.addFiles('lib/handleMeasurementModified.js', 'client');
     api.addFiles('lib/handleMeasurementRemoved.js', 'client');
 
+    api.addFiles('lib/exportStudies.js', 'client');
+
 
     // Export global functions
     api.export('pixelSpacingAutorunCheck', 'client');
@@ -191,6 +193,7 @@ Package.onUse(function(api) {
     api.export('getTrialCriteriaConstraints', 'client');
     api.export('calculateTotalLesionBurden', 'client');
     api.export('convertToNonTarget', 'client');
+    api.export('exportStudies', 'client');
 
     // Export global objects
     api.export('TrialResponseCriteria', 'client');