Invalid data structure - but Download works fine

[florianrhomberg]

Hello, if I try to open a PDF I get using CMIS with Apache chemistry with a Stream Resource handler I get the mentioned error. However if I open the PDF using the EmbeddedPDf viewer it works excepted usind Edge. However downloading the PDF file works fine and I can open the downloaded file with any pdf viewer.

1. Getting the PDF using Apache Chemistry and writing it into a FileRecord: ` public static FileRecord getDocumentAsFileRecord(CmisClient client, String objectId) throws IOException { Document document = getDocument(client, objectId); if(document != null) {

       InputStream stream = document.getContentStream().getStream();
       byte[] byteEncoded = Base64.getEncoder().encode(IOUtils.toByteArray(stream));
   
       FileRecord record = new FileRecord();
       record.setFile(byteEncoded);
       record.setFilename(document.getName());
       record.setFiletyp(document.getContentStream().getMimeType());
       record.setDeleted(false);
       record.setCreationDate(Date.from(document.getCreationDate().toZonedDateTime().toInstant()));
       record.setSize(document.getContentStream().getStream().readAllBytes().length);
       record.setCmisId(objectId);
       return record;
   }
   return null;

   } `

2. Create the Stream resource of the file record: ` public static StreamResource getStream(final FileRecord record) { InputStreamFactory factory = new InputStreamFactory() { @Override public InputStream createInputStream() { return new ByteArrayInputStream(record.getFile()); } };

   StreamResource resource = new StreamResource(record.getFilename(), factory);
   resource.setContentType(record.getFiletyp());
   return resource;

   } `

3. Combining both methods and creating an instance of the PdfViewer: ` private void createPdfViewer() { this.removeAll();

   //
   // This is working:
   //
   EmbeddedPdfDocument pdf = new EmbeddedPdfDocument(StreamResourceHandler.getStream(record));
   pdf.setSizeFull();
   //this.add(pdf);
   
   //
   // This fails with "Invalid Data structure
   //
   PdfViewer viewer = new PdfViewer();
   viewer.setSrc(StreamResourceHandler.getStream(record));
   viewer.setSizeFull();
   this.add(viewer);

   } `

The PDF is not displayed. Hopefully somone can help me, thanks, Florian

[probert94]

I am facing a similar issue and was able to find the reason for it. The pdf-viewer stops working, as soon as you have a path with at least one segment, which ends with a "/". So if you access the pdf-viewer with localhost:8080/test it works, if you access it with localhost:8080/test/ it gives the error "Invalid PDF structure". Checking the network tab you can see, that without the trailing "/", it requests the pdf at "http://localhost:8080/VAADIN/dynamic/resource/5/e5b03283-446d-4ef4-8f78-b2f0338008bf/example.pdf", while with trailing "/" it uses "http://localhost:8080/test/VAADIN/dynamic/resource/6/855dcd49-f3c7-4432-ae36-7131119418ff/example.pdf". In my case I have a route with URL-Parameters, so I always have at least one path segment and the pdf-viewer therefor never works in my case.

[probert94]

My current workaround is to register a custom RequestHandler which checks if the current URI contains the dynamic resource prefix and if thats the case, it searches for the specific dynamic resource. I the resource is the one the PdfViewer should show, it will handle it using the StreamResourceHandler.

return (VaadinSession session, VaadinRequest request, VaadinResponse response) -> {
  String pathInfo = request.getPathInfo();
  int idx = Strings.indexOfIgnoreCase(pathInfo, StreamRequestHandler.DYN_RES_PREFIX);
  if (idx > 0) {
    String resourcePath = pathInfo.substring(idx);
    session.lock();
    try {
      if (getPathUri(resourcePath)
        .flatMap(session.getResourceRegistry()::getResource)
        .filter(resource -> resource == src)
        .isPresent())
      {
        new StreamResourceHandler().handleRequest(session, request, response, src);
        return true;
      }
    }
    finally {
      session.unlock();
    }
  }
  return false;
};

[paodb]

Could you give it a try with latest version 2.0.2?

[probert94]

Seems to work with 2.0.2, thank you