implemented new download resource (Issue #76)

src/main/java/org/imixs/application/admin/ConnectionController.java

@@ -15,7 +15,7 @@
 import org.imixs.workflow.ItemCollection;
 
 import jakarta.enterprise.context.Conversation;
-import jakarta.enterprise.context.ConversationScoped;
+import jakarta.enterprise.context.SessionScoped;
 import jakarta.faces.context.FacesContext;
 import jakarta.inject.Inject;
 import jakarta.inject.Named;
@@ -39,7 +39,8 @@
  *
  */
 @Named
-@ConversationScoped
+// @ConversationScoped
+@SessionScoped
 public class ConnectionController implements Serializable {
 
     private static final long serialVersionUID = 7027147503119012594L;

src/main/java/org/imixs/application/admin/DocumentController.java

@@ -146,17 +146,17 @@ public void delete(String id) {
      * in the browser.
      */
     public void downloadDocument(String id, String filename) {
+        FacesContext facesContext = FacesContext.getCurrentInstance();
+        HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
         try {
             // load report
             WorkflowClient workflowClient = connectionController.getWorkflowClient();
             ItemCollection downloadDocument = workflowClient.getDocument(id);
             XMLDocument xmlDocument = XMLDocumentAdapter.getDocument(downloadDocument);
 
             // set Content-Type and Header for Download
-            FacesContext facesContext = FacesContext.getCurrentInstance();
-            HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
             response.setContentType("application/octet-stream");
-            response.setHeader("Content-Disposition", "attachment;filename=" + filename);
+            response.setHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
 
             // marshal xmlObject...
             JAXBContext jaxbContext = JAXBContext.newInstance(xmlDocument.getClass());
@@ -175,7 +175,21 @@ public void downloadDocument(String id, String filename) {
             facesContext.responseComplete();
         } catch (IOException | JAXBException | RestAPIException e) {
             e.printStackTrace();
+        } finally {
+            // Ensure the output stream is closed
+            try {
+                if (response.getOutputStream() != null) {
+                    response.getOutputStream().close();
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
         }
     }
 
+    public String getDownloadUrl(String id, String filename) {
+        // Beispiel: Erstellen Sie die REST-URL für den Download
+        return "/api/download?fileId=" + id + "&filename=" + filename;
+    }
+
 }

src/main/java/org/imixs/application/admin/DownloadResource.java

@@ -0,0 +1,79 @@
+package org.imixs.application.admin;
+
+import org.imixs.melman.RestAPIException;
+import org.imixs.melman.WorkflowClient;
+import org.imixs.workflow.ItemCollection;
+import org.imixs.workflow.xml.XMLDocument;
+import org.imixs.workflow.xml.XMLDocumentAdapter;
+
+import jakarta.inject.Inject;
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.QueryParam;
+import jakarta.ws.rs.core.Response;
+import jakarta.ws.rs.core.StreamingOutput;
+import jakarta.xml.bind.JAXBContext;
+import jakarta.xml.bind.JAXBException;
+import jakarta.xml.bind.Marshaller;
+
+/**
+ * Rest API Endpoint to load a xml document from the remote instance This
+ * endpoint is used for download links
+ *
+ */
+@Path("/download")
+public class DownloadResource {
+
+    @Inject
+    ConnectionController connectionController;
+
+    @GET
+    public Response downloadFile(@QueryParam("fileId") String fileId, @QueryParam("filename") String filename) {
+        try {
+            // Holen Sie sich das XML-Dokument
+            XMLDocument xmlDocument = getXmlDocument(fileId);
+
+            // Erstellen Sie einen StreamingOutput, um die Datei zu schreiben
+            StreamingOutput streamingOutput = output -> {
+                JAXBContext jaxbContext;
+                try {
+                    jaxbContext = JAXBContext.newInstance(XMLDocument.class);
+                    Marshaller marshaller = jaxbContext.createMarshaller();
+                    marshaller.marshal(xmlDocument, output);
+                } catch (JAXBException e) {
+                    // TODO Auto-generated catch block
+                    e.printStackTrace();
+                }
+            };
+
+            // Setzen Sie die HTTP-Header für den Download
+            return Response.ok(streamingOutput)
+                    .header("Content-Disposition", "attachment; filename=\"" + filename + "\"").type("application/xml")
+                    .build();
+        } catch (Exception e) {
+            e.printStackTrace();
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR)
+                    .entity("Fehler beim Generieren der Datei: " + e.getMessage()).build();
+        }
+    }
+
+    /**
+     * This method loads a document by its UniqueID and initialzes a download
+     * stream. Used in the search view and in reports.xhtml to download a Document
+     * objects as an XML file. The filename is the name the download will be shown
+     * in the browser.
+     */
+    public XMLDocument getXmlDocument(String id) {
+        XMLDocument xmlDocument = null;
+        try {
+            // load document
+            WorkflowClient workflowClient = connectionController.getWorkflowClient();
+            ItemCollection downloadDocument = workflowClient.getDocument(id);
+            xmlDocument = XMLDocumentAdapter.getDocument(downloadDocument);
+        } catch (RestAPIException e) {
+            e.printStackTrace();
+        }
+        return xmlDocument;
+    }
+
+}

src/main/webapp/reports.xhtml

@@ -36,38 +36,32 @@
 											disabled="#{!connectionController.connected}">
 										</h:commandLink>
 									</td>
-
 									<td>#{report.item['contenttype']}</td>
-
 									<td>#{report.item['encoding']}</td>
-
 									<td>#{report.item['$modified']}</td>
 
 									<!-- download/delete -->
 									<td>
 										<ui:param name="downloadName"
-											value="#{report.getItemValueString('txtname').concat('.xml')}" />
-										<h:commandLink value="" title="#{downloadName}"
-											action="#{documentController.downloadDocument(report.item['$uniqueid'],downloadName)}">
+											value="#{report.getItemValueString('txtname').concat('.imixs-report')}" />
+										<h:outputLink value="#{documentController.getDownloadUrl(report.item['$uniqueid'], downloadName)}"
+													title="#{downloadName}">
 											<span class="typcn typcn-download"></span>
-										</h:commandLink>
+										</h:outputLink>
 										<h:commandLink
 											actionListener="#{reportController.deleteReport(report.item['$uniqueid'])}"
 											disabled="#{!connectionController.connected}"
 											onclick="return (confirm('Delete Report #{report.item['txtname']} ?'))">
 											<span class="typcn typcn-trash error"></span>
-										</h:commandLink>
+										</h:commandLink>										
 									</td>
-
-
 								</tr>
 							</ui:repeat>
 						</tbody>
 					</table>
 
 					<h:commandButton actionListener="#{reportController.createReport()}" value="Create new Report"
 						disabled="#{!connectionController.connected}" action="report">
-
 					</h:commandButton>
 
 					<div class="imixs-form-section">
@@ -82,9 +76,6 @@
 						</dl>
 					</div>
 
-
-
-
 				</div>
 			</h:form>
 		</f:view>