I've written a servlet to generate Document of Record PDFs for our forms. After some work, I've gotten it to output PDFs, but the PDFs are always damaged.
Viewing the PDFs in a text editor doesn't reveal anything obviously wrong. Using an online PDF repair tool shows the following errors:
0x8041010B - E - The 'xref' keyword was not found or the xref table is malformed.
- File: 20185000044 (4).pdf
Recover XREF table.
0x8A117FFD - E - Error in Flate stream: data error.
- Object No.: 12
- File: 20185000044 (4).pdf
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 10
- File: 20185000044 (4).pdf
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 11
- File: 20185000044 (4).pdf
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 3
- File: 20185000044 (4).pdf
0x8A117FFD - E - Error in Flate stream: data error.
- Object No.: 4
- File: 20185000044 (4).pdf
Analyze Objects.
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 3
- File: 20185000044 (4).pdf
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 3
- File: 20185000044 (4).pdf
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 10
- File: 20185000044 (4).pdf
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 10
- File: 20185000044 (4).pdf
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 11
- File: 20185000044 (4).pdf
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 11
- File: 20185000044 (4).pdf
Analyze Outlines.
Analyze Pages.
0x80410402 - E - The page or page tree node has a missing or invalid "Type" key.
- Object No.: 5
- File: 20185000044 (4).pdf
0x80410113 - E - The file is corrupt and cannot be repaired. Some of the contents can possibly be recovered.
- File: 20185000044 (4).pdf
Recover Pages.
Save output file.
0x80410306 - E - The "Length" key of the stream object is wrong.
- Object No.: 11
- Page No.: 1
- File: 20185000044 (4).pdf
0x8A117FFD - E - Error in Flate stream: data error.
- Object No.: 11
- Page No.: 1
- File: 20185000044 (4).pdf
0x0A09C006 - W - Invalid content of XMP packet header attribute 'begin': '?'.
- XPath: /xpacket
- File: C:\Windows\TEMP\osa\4939-524cbfb612d843ebb66d6ecf364c7ef0repair.tmp
Close file.
I tried outputting a PostScript file instead. Inspecting that file showed that it was attempting to render the template with the given data, but I was also unable to open that file.
I've tried reducing the template to a bare minimum and massaging the data every which way, but I haven't managed to make OutputService give me a single good file. Code follows.
private void renderDOR(String id, SlingHttpServletRequest request, SlingHttpServletResponse response) {
Document templateDocument;
Document xmlXdpDocument;
Document pdfDocument;
PDFOutputOptions pdfOptions;
FormMetadata formMetadata;
BinaryData formData;
try {
formMetadata = formsDatabase.getMetadata(id);
formData = formsDatabase.getFormData(formMetadata.getUserdataID());
} catch (SQLException e) {
log.error("Failed to retrieve form metadata for id " + id, e);
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
if (formData == null) {
log.error("No formData found for form ID {}", id);
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
return;
}
log.debug(formData.getDataAsString());
templateDocument = getTemplateDocument(formMetadata, request.getResourceResolver());
xmlXdpDocument = getXmlXdpDocument(formDataToDocument(formData.getDataAsStream()));
pdfOptions = new PDFOutputOptions();
pdfOptions.setAcrobatVersion(com.adobe.fd.output.api.AcrobatVersion.Acrobat_11);
pdfOptions.setLinearizedPDF(true);
try {
pdfDocument = outputService.generatePDFOutput(templateDocument, xmlXdpDocument, pdfOptions);
} catch (OutputServiceException e) {
log.error("Error generating PDF output", e);
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
try {
// Write PDF to response
InputStream in = pdfDocument.getInputStream();
Writer out = response.getWriter();
IOUtils.copy(in, out, StandardCharsets.UTF_8.name());
setHeaders(response, id);
} catch (MalformedURLException e) {
log.error("Failed to generate PDF", e);
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
} catch (IOException e) {
log.error("Failed to write PDF to response", e);
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
}
private Document getTemplateDocument(FormMetadata formMetadata, ResourceResolver resourceResolver) {
String formPath = DEFAULT_FORM_PATH;
if (StringUtils.isNotBlank(formMetadata.getFormPath())) {
formPath = formMetadata.getFormPath();
}
Resource resource = resourceResolver.getResource(formPath + FORM_METADATA_PATH);
if (resource == null) {
log.error("Metadata for form {} not found", formPath);
return null;
}
String templateXdpPath = resource.getValueMap().get(FormsPortalConstants.STR_DOR_TEMPLATE_REF)
+ DOR_TEMPLATE_SUBPATH;
log.debug("Using template {}", templateXdpPath);
return new Document(templateXdpPath);
}
private Document getXmlXdpDocument(org.w3c.dom.Document afXmlDocument) {
// Adaptive Form data has additional structure.
// Get just the XDP data and load into Adobe Document object
try {
String xmlDataXDP = XMLUtils.getUnboundDataXmlPart(afXmlDocument);
log.debug("XMLDataXDP: {}", xmlDataXDP);
InputStream inStreamXDPXML = IOUtils.toInputStream(xmlDataXDP, "UTF-8");
return new Document(inStreamXDPXML);
} catch (IOException e) {
log.error("Failed to create XML XDP document", e);
}
return null;
}
private org.w3c.dom.Document formDataToDocument(InputStream data) {
try {
Reader reader = new InputStreamReader(data, StandardCharsets.UTF_8.name());
InputSource source = new InputSource(reader);
source.setEncoding(StandardCharsets.UTF_8.name());
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
docFactory.setNamespaceAware(true);
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
org.w3c.dom.Document document = docBuilder.parse(source);
document.getDocumentElement().normalize();
return document;
} catch (ParserConfigurationException e) {
log.warn("Failed to initialize DocumentBuilder", e);
} catch (SAXException | IOException e) {
log.warn("Failed to parse form data", e);
}
return null;
}
private void setHeaders(SlingHttpServletResponse response, String filename) {
response.setContentType(Constants.ContentType.PDF);
response.setCharacterEncoding(StandardCharsets.UTF_8.name());
response.setHeader("Content-Disposition", "attachment; filename=\""
+ filename + ".pdf\"");
}
What could I be doing wrong here?
