Previews spam "Unsupported format" Exceptions if the uploaded file is not a PDF file.
I already fixed it and replaced the ConvertPdf in the web.xml with my custom implementation.
My converter also considers existing "[VERSION]-conversion.pdf" files.
So here is my code, you are free to integrate it into logicaldoc, but without warranty:
import static com.logicaldoc.web.util.ServletUtil.downloadDocument;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.logicaldoc.core.document.Document;
import com.logicaldoc.core.document.Version;
import com.logicaldoc.core.document.dao.DocumentDAO;
import com.logicaldoc.core.document.dao.VersionDAO;
import com.logicaldoc.core.store.Storer;
import com.logicaldoc.util.Context;
import com.logicaldoc.web.util.ServletUtil;
/**
* This servlet simply downloads the document PDF.
*/
public class ConvertPdf extends HttpServlet {
private static final String VERSION = "version";
private static final String DOCUMENT_ID = "docId";
private static final long serialVersionUID = 1L;
protected static Logger log = LoggerFactory.getLogger(ConvertPdf.class);
@Override
public void doPost(final HttpServletRequest request, final HttpServletResponse response) {
try {
doGet(request, response);
} catch (Throwable th) {
throw new RuntimeException(th);
}
}
@Override
public void doGet(final HttpServletRequest request, final HttpServletResponse response) {
try {
var session = ServletUtil.validateSession(request);
var docDao = (DocumentDAO) Context.get().getBean(DocumentDAO.class);
var versionDao = (VersionDAO) Context.get().getBean(VersionDAO.class);
var docId = Long.parseLong(request.getParameter(DOCUMENT_ID));
var document = findDocument(docDao, docId);
var version = getDocumentVersion(request, versionDao, docId, document);
var suffix = getConversionSuffix(document);
if (documentResourceExists(docId, version, suffix)) {
downloadDocument(request, response, null, document.getId(), version.getFileVersion(), null, suffix, session.getUser());
} else {
downloadNotAvailablePdf(request, response);
}
} catch (Throwable th) {
log.error(th.getMessage(), th);
downloadNotAvailablePdf(request, response);
}
}
private Document findDocument(DocumentDAO docDao, long docId) {
var document = docDao.findById(docId);
if (document.getDocRef() != null) {
document = docDao.findById(document.getDocRef());
}
return document;
}
private Version getDocumentVersion(final HttpServletRequest request, VersionDAO versionDao, long docId, Document document) {
var ver = document.getVersion();
if (StringUtils.isNotEmpty(request.getParameter(VERSION))) {
ver = request.getParameter(VERSION);
}
return versionDao.findByVersion(docId, ver);
}
private String getConversionSuffix(Document document) {
if (isPdfDocument(document)) {
return null;
} else {
return "conversion.pdf";
}
}
private boolean documentResourceExists(long docId, Version version, String suffix) {
var storer = (Storer) Context.get().getBean(Storer.class);
var resource = storer.getResourceName(docId, version.getFileVersion(), suffix);
return storer.exists(docId, resource);
}
private void downloadNotAvailablePdf(final HttpServletRequest request, final HttpServletResponse response) {
int letter = 0;
try (InputStream is = ConvertPdf.class.getResourceAsStream("/pdf/notavailable.pdf");
OutputStream os = response.getOutputStream();) {
ServletUtil.setContentDisposition(request, response, "notavailable.pdf");
while ((letter = is.read()) != -1) {
os.write(letter);
}
} catch (Throwable e) {
log.warn(e.getMessage());
}
}
private boolean isPdfDocument(Document document) {
return StringUtils.endsWithIgnoreCase(document.getFileName(), ".pdf");
}
}
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