/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.services.document.impl;
import org.apache.jempbox.xmp.XMPMetadata;
import org.apache.jempbox.xmp.XMPSchemaBasic;
import org.apache.jempbox.xmp.XMPSchemaDublinCore;
import org.apache.pdfbox.exceptions.InvalidPasswordException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDDocumentCatalog;
import org.apache.pdfbox.pdmodel.PDDocumentInformation;
import org.apache.pdfbox.pdmodel.common.PDMetadata;
import org.apache.pdfbox.util.PDFTextStripper;
import org.exoplatform.services.document.DCMetaData;
import org.exoplatform.services.document.DocumentReadException;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.util.Calendar;
import java.util.List;
import java.util.Properties;
/**
* Created by The eXo Platform SAS A parser of Adobe PDF files.
*
* @author Phung Hai Nam
* @author Gennady Azarenkov
* @version Oct 19, 2005
*/
public class PDFDocumentReader extends BaseDocumentReader
{
protected static Log log = ExoLogger.getLogger("exo.core.component.document.PDFDocumentReader");
/**
* Get the application/pdf mime type.
*
* @return The application/pdf mime type.
*/
public String[] getMimeTypes()
{
return new String[]{"application/pdf"};
}
/**
* Returns only a text from pdf file content.
*
* @param is an input stream with .pdf file content.
* @return The string only with text from file content.
*/
public String getContentAsText(final InputStream is) throws IOException, DocumentReadException
{
if (is == null)
{
throw new NullPointerException("InputStream is null.");
}
PDDocument pdDocument = null;
StringWriter sw = new StringWriter();
try
{
if (is.available() == 0)
return "";
try
{
pdDocument = PDDocument.load(is);
}
catch (IOException e)
{
throw new DocumentReadException("Can not load PDF document.", e);
}
PDFTextStripper stripper = new PDFTextStripper();
stripper.setStartPage(1);
stripper.setEndPage(Integer.MAX_VALUE);
stripper.writeText(pdDocument, sw);
}
finally
{
if (pdDocument != null)
try
{
pdDocument.close();
}
catch (IOException e)
{
}
if (is != null)
try
{
is.close();
}
catch (IOException e)
{
}
}
return sw.toString();
}
public String getContentAsText(InputStream is, String encoding) throws IOException, DocumentReadException
{
// Ignore encoding
return getContentAsText(is);
}
/*
* (non-Javadoc)
*
* @see org.exoplatform.services.document.DocumentReader#getProperties(java.io.
* InputStream)
*/
public Properties getProperties(InputStream is) throws IOException, DocumentReadException
{
PDDocument pdDocument = PDDocument.load(is);
Properties props = new Properties();
try
{
if (pdDocument.isEncrypted())
{
try
{
pdDocument.decrypt("");
}
catch (InvalidPasswordException e)
{
throw new DocumentReadException("The pdf document is encrypted.", e);
}
catch (org.apache.pdfbox.exceptions.CryptographyException e)
{
throw new DocumentReadException(e.getMessage(), e);
}
}
PDDocumentCatalog catalog = pdDocument.getDocumentCatalog();
PDMetadata meta = catalog.getMetadata();
if (meta != null)
{
XMPMetadata metadata = meta.exportXMPMetadata();
XMPSchemaDublinCore dc = metadata.getDublinCoreSchema();
if (dc != null)
{
try
{
if (dc.getTitle() != null)
props.put(DCMetaData.TITLE, fixEncoding(dc.getTitle()));
}
catch (Exception e)
{
log.warn("getTitle failed: " + e);
}
try
{
if (dc.getDescription() != null)
props.put(DCMetaData.SUBJECT, fixEncoding(dc.getDescription()));
}
catch (Exception e)
{
log.warn("getSubject failed: " + e);
}
try
{
if (dc.getCreators() != null)
{
List<String> list = dc.getCreators();
for (String creator : list)
{
props.put(DCMetaData.CREATOR, fixEncoding(creator));
}
}
}
catch (Exception e)
{
log.warn("getCreator failed: " + e);
}
try
{
if (dc.getDates() != null)
{
List<Calendar> list = dc.getDates();
for (Calendar date : list)
{
props.put(DCMetaData.DATE, date);
}
}
}
catch (Exception e)
{
log.warn("getDate failed: " + e);
}
}
XMPSchemaBasic basic = metadata.getBasicSchema();
if (basic != null)
{
try
{
if (basic.getCreateDate() != null)
props.put(DCMetaData.DATE, basic.getCreateDate());
}
catch (Exception e)
{
log.warn("getCreationDate failed: " + e);
}
try
{
if (basic.getModifyDate() != null)
props.put(DCMetaData.DATE, basic.getModifyDate());
}
catch (Exception e)
{
log.warn("getModificationDate failed: " + e);
}
}
}
if (props.isEmpty())
{
// The pdf doesn't contain any XMP metadata or XMP metadata do not contains any
// usefull data, try to use the document information instead
PDDocumentInformation docInfo = pdDocument.getDocumentInformation();
if (docInfo != null)
{
try
{
if (docInfo.getCreationDate() != null)
props.put(DCMetaData.DATE, docInfo.getCreationDate());
}
catch (Exception e)
{
log.warn("getCreationDate failed: " + e);
}
try
{
if (docInfo.getCreator() != null)
props.put(DCMetaData.CREATOR, docInfo.getCreator());
}
catch (Exception e)
{
log.warn("getCreator failed: " + e);
}
try
{
if (docInfo.getKeywords() != null)
props.put(DCMetaData.SUBJECT, docInfo.getKeywords());
}
catch (Exception e)
{
log.warn("getKeywords failed: " + e);
}
try
{
if (docInfo.getModificationDate() != null)
props.put(DCMetaData.DATE, docInfo.getModificationDate());
}
catch (Exception e)
{
log.warn("getModificationDate failed: " + e);
}
try
{
if (docInfo.getSubject() != null)
props.put(DCMetaData.DESCRIPTION, docInfo.getSubject());
}
catch (Exception e)
{
log.warn("getSubject failed: " + e);
}
try
{
if (docInfo.getTitle() != null)
props.put(DCMetaData.TITLE, docInfo.getTitle());
}
catch (Exception e)
{
log.warn("getTitle failed: " + e);
}
}
}
}
finally
{
if (pdDocument != null)
{
pdDocument.close();
}
}
return props;
}
private String fixEncoding(String str) throws DocumentReadException
{
try
{
String encoding = null;
int orderMaskOffset = 0;
if (str.startsWith("\\000\\000\\376\\377"))
{
encoding = "UTF-32BE";
orderMaskOffset = 16;
}
else if (str.startsWith("\\377\\376\\000\\000"))
{
encoding = "UTF-32LE";
orderMaskOffset = 16;
}
else if (str.startsWith("\\376\\377"))
{
encoding = "UTF-16BE";
orderMaskOffset = 8;
}
else if (str.startsWith("\\377\\376"))
{
encoding = "UTF-16LE";
orderMaskOffset = 8;
}
if (encoding == null)
{
// return default
return str;
}
else
{
int i = orderMaskOffset, len = str.length();
char c;
StringBuilder sb = new StringBuilder(len);
while (i < len)
{
c = str.charAt(i++);
if (c == '\\')
{
if (i + 3 <= len)
{
//extract octal-code
try
{
c = (char)Integer.parseInt(str.substring(i, i + 3), 8);
i += 3;
}
catch (NumberFormatException e)
{
if (log.isDebugEnabled())
{
log.debug(
"PDF metadata exctraction warning: can not decode octal code - "
+ str.substring(i - 1, i + 3) + ".", e);
}
}
}
else
{
if (log.isDebugEnabled())
{
log.debug("PDF metadata exctraction warning: octal code is not complete - "
+ str.substring(i - 1, len));
}
}
}
sb.append(c);
}
byte[] bytes = sb.toString().getBytes();
return new String(bytes, encoding);
}
}
catch (UnsupportedEncodingException e)
{
throw new DocumentReadException(e.getMessage(), e);
}
}
}