ConvertPdf spams "Unsupported format" Exceptions

[hgschwibbe]

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.

I placed some conversion.pdf files in the repository and everything works fine:

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");
    }
}