/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.core.query.pdf;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDDocumentInformation;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.PagedText;
import org.apache.tika.metadata.Property;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
/**
* PDF parser.
* <p>
* This parser can process also encrypted PDF documents if the required
* password is given as a part of the input metadata associated with a
* document. If no password is given, then this parser will try decrypting
* the document using the empty password that's often used with PDFs.
*/
public class PDFParser implements Parser {
/** Serial version UID */
private static final long serialVersionUID = -752276948656079347L;
/**
* Metadata key for giving the document password to the parser.
*
* @since Apache Tika 0.5
*/
public static final String PASSWORD = "org.apache.tika.parser.pdf.password";
private static final Set<MediaType> SUPPORTED_TYPES =
Collections.singleton(MediaType.application("pdf"));
public Set<MediaType> getSupportedTypes(ParseContext context) {
return SUPPORTED_TYPES;
}
public void parse(
InputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context)
throws IOException, SAXException, TikaException {
PDDocument pdfDocument = PDDocument.load(stream, true);
try {
if (pdfDocument.isEncrypted()
&& !pdfDocument.getCurrentAccessPermission().canExtractContent()) {
try {
String password = metadata.get(PASSWORD);
if (password == null) {
password = "";
}
pdfDocument.decrypt(password);
} catch (Exception e) {
// Ignore
}
}
metadata.set(Metadata.CONTENT_TYPE, "application/pdf");
extractMetadata(pdfDocument, metadata);
PDF2XHTML.process(pdfDocument, handler, metadata);
} finally {
pdfDocument.close();
}
}
/**
* @deprecated This method will be removed in Apache Tika 1.0.
*/
public void parse(
InputStream stream, ContentHandler handler, Metadata metadata)
throws IOException, SAXException, TikaException {
parse(stream, handler, metadata, new ParseContext());
}
private void extractMetadata(PDDocument document, Metadata metadata)
throws TikaException {
PDDocumentInformation info = document.getDocumentInformation();
metadata.set(PagedText.N_PAGES, document.getNumberOfPages());
addMetadata(metadata, Metadata.TITLE, info.getTitle());
addMetadata(metadata, Metadata.AUTHOR, info.getAuthor());
addMetadata(metadata, Metadata.CREATOR, info.getCreator());
addMetadata(metadata, Metadata.KEYWORDS, info.getKeywords());
addMetadata(metadata, "producer", info.getProducer());
addMetadata(metadata, Metadata.SUBJECT, info.getSubject());
addMetadata(metadata, "trapped", info.getTrapped());
try {
addMetadata(metadata, "created", info.getCreationDate());
addMetadata(metadata, Metadata.CREATION_DATE, info.getCreationDate());
} catch (IOException e) {
// Invalid date format, just ignore
}
try {
Calendar modified = info.getModificationDate();
addMetadata(metadata, Metadata.LAST_MODIFIED, modified);
} catch (IOException e) {
// Invalid date format, just ignore
}
// All remaining metadata is custom
// Copy this over as-is
List<String> handledMetadata = Arrays.asList(new String[] {
"Author", "Creator", "CreationDate", "ModDate",
"Keywords", "Producer", "Subject", "Title", "Trapped"
});
for(COSName key : info.getDictionary().keySet()) {
String name = key.getName();
if(! handledMetadata.contains(name)) {
addMetadata(metadata, name, info.getDictionary().getDictionaryObject(key));
}
}
}
private void addMetadata(Metadata metadata, String name, String value) {
if (value != null) {
metadata.add(name, value);
}
}
private void addMetadata(Metadata metadata, String name, Calendar value) {
if (value != null) {
metadata.set(name, value.getTime().toString());
}
}
private void addMetadata(Metadata metadata, Property property, Calendar value) {
if (value != null) {
metadata.set(property, value.getTime());
}
}
/**
* Used when processing custom metadata entries, as PDFBox won't do
* the conversion for us in the way it does for the standard ones
*/
private void addMetadata(Metadata metadata, String name, COSBase value) {
if(value instanceof COSArray) {
for(COSBase v : ((COSArray)value).toList()) {
addMetadata(metadata, name, v);
}
} else if(value instanceof COSString) {
addMetadata(metadata, name, ((COSString)value).getString());
} else {
addMetadata(metadata, name, value.toString());
}
}
}