/*
* 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.tika.parser.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.io.RandomAccess;
import org.apache.pdfbox.io.RandomAccessBuffer;
import org.apache.pdfbox.io.RandomAccessFile;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDDocumentInformation;
import org.apache.tika.exception.TikaException;
import org.apache.tika.extractor.EmbeddedDocumentExtractor;
import org.apache.tika.io.CloseShieldInputStream;
import org.apache.tika.io.TemporaryResources;
import org.apache.tika.io.TikaInputStream;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.PagedText;
import org.apache.tika.metadata.Property;
import org.apache.tika.metadata.TikaCoreProperties;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AbstractParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.PasswordProvider;
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. If
* the PDF contains any embedded documents (for example as part of a PDF
* package) then this parser will use the {@link EmbeddedDocumentExtractor}
* to handle them.
*/
public class PDFParser extends AbstractParser {
/** Serial version UID */
private static final long serialVersionUID = -752276948656079347L;
private PDFParserConfig defaultConfig = new PDFParserConfig();
/**
* Metadata key for giving the document password to the parser.
*
* @since Apache Tika 0.5
* @deprecated Supply a {@link PasswordProvider} on the {@link ParseContext} instead
*/
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 = null;
TemporaryResources tmp = new TemporaryResources();
//config from context, or default if not set via context
PDFParserConfig localConfig = context.get(PDFParserConfig.class, defaultConfig);
try {
// PDFBox can process entirely in memory, or can use a temp file
// for unpacked / processed resources
// Decide which to do based on if we're reading from a file or not already
TikaInputStream tstream = TikaInputStream.cast(stream);
if (tstream != null && tstream.hasFile()) {
// File based, take that as a cue to use a temporary file
RandomAccess scratchFile = new RandomAccessFile(tmp.createTemporaryFile(), "rw");
if (localConfig.getUseNonSequentialParser() == true){
pdfDocument = PDDocument.loadNonSeq(new CloseShieldInputStream(stream), scratchFile);
} else {
pdfDocument = PDDocument.load(new CloseShieldInputStream(stream), scratchFile, true);
}
} else {
// Go for the normal, stream based in-memory parsing
if (localConfig.getUseNonSequentialParser() == true){
pdfDocument = PDDocument.loadNonSeq(new CloseShieldInputStream(stream), new RandomAccessBuffer());
} else {
pdfDocument = PDDocument.load(new CloseShieldInputStream(stream), true);
}
}
if (pdfDocument.isEncrypted()) {
String password = null;
// Did they supply a new style Password Provider?
PasswordProvider passwordProvider = context.get(PasswordProvider.class);
if (passwordProvider != null) {
password = passwordProvider.getPassword(metadata);
}
// Fall back on the old style metadata if set
if (password == null && metadata.get(PASSWORD) != null) {
password = metadata.get(PASSWORD);
}
// If no password is given, use an empty string as the default
if (password == null) {
password = "";
}
try {
pdfDocument.decrypt(password);
} catch (Exception e) {
// Ignore
}
}
metadata.set(Metadata.CONTENT_TYPE, "application/pdf");
extractMetadata(pdfDocument, metadata);
PDF2XHTML.process(pdfDocument, handler, context, metadata, localConfig);
} finally {
if (pdfDocument != null) {
pdfDocument.close();
}
tmp.dispose();
}
handler.endDocument();
}
private void extractMetadata(PDDocument document, Metadata metadata)
throws TikaException {
PDDocumentInformation info = document.getDocumentInformation();
metadata.set(PagedText.N_PAGES, document.getNumberOfPages());
addMetadata(metadata, TikaCoreProperties.TITLE, info.getTitle());
addMetadata(metadata, TikaCoreProperties.CREATOR, info.getAuthor());
addMetadata(metadata, TikaCoreProperties.CREATOR_TOOL, info.getCreator());
addMetadata(metadata, TikaCoreProperties.KEYWORDS, info.getKeywords());
addMetadata(metadata, "producer", info.getProducer());
// TODO: Move to description in Tika 2.0
addMetadata(metadata, TikaCoreProperties.TRANSITION_SUBJECT_TO_OO_SUBJECT, info.getSubject());
addMetadata(metadata, "trapped", info.getTrapped());
try {
// TODO Remove these in Tika 2.0
addMetadata(metadata, "created", info.getCreationDate());
addMetadata(metadata, TikaCoreProperties.CREATED, info.getCreationDate());
} catch (IOException e) {
// Invalid date format, just ignore
}
try {
Calendar modified = info.getModificationDate();
addMetadata(metadata, Metadata.LAST_MODIFIED, modified);
addMetadata(metadata, TikaCoreProperties.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, Property property, String value) {
if (value != null) {
metadata.add(property, value);
}
}
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(Object v : ((COSArray)value).toList()) {
addMetadata(metadata, name, ((COSBase) v));
}
} else if(value instanceof COSString) {
addMetadata(metadata, name, ((COSString)value).getString());
} else if (value != null){
addMetadata(metadata, name, value.toString());
}
}
public void setPDFParserConfig(PDFParserConfig config){
this.defaultConfig = config;
}
public PDFParserConfig getPDFParserConfig(){
return defaultConfig;
}
/**
* If true, the parser will use the NonSequentialParser. This may
* be faster than the full doc parser.
* If false (default), this will use the full doc parser.
*
* @deprecated use {@link #setPDFParserConfig(PDFParserConfig)}
*/
public void setUseNonSequentialParser(boolean v){
defaultConfig.setUseNonSequentialParser(v);
}
/**
* @see #setUseNonSequentialParser(boolean)
* @deprecated use {@link #getPDFParserConfig()}
*/
public boolean getUseNonSequentialParser(){
return defaultConfig.getUseNonSequentialParser();
}
/**
* If true (the default), the parser should estimate
* where spaces should be inserted between words. For
* many PDFs this is necessary as they do not include
* explicit whitespace characters.
*
* @deprecated use {@link #setPDFParserConfig(PDFParserConfig)}
*/
public void setEnableAutoSpace(boolean v) {
defaultConfig.setEnableAutoSpace(v);
}
/**
* @see #setEnableAutoSpace.
* @deprecated use {@link #getPDFParserConfig()}
*/
public boolean getEnableAutoSpace() {
return defaultConfig.getEnableAutoSpace();
}
/**
* If true (the default), text in annotations will be
* extracted.
* @deprecated use {@link #setPDFParserConfig(PDFParserConfig)}
*/
public void setExtractAnnotationText(boolean v) {
defaultConfig.setExtractAnnotationText(v);
}
/**
* If true, text in annotations will be extracted.
*
* @deprecated use {@link #getPDFParserConfig()}
*/
public boolean getExtractAnnotationText() {
return defaultConfig.getExtractAnnotationText();
}
/**
* If true, the parser should try to remove duplicated
* text over the same region. This is needed for some
* PDFs that achieve bolding by re-writing the same
* text in the same area. Note that this can
* slow down extraction substantially (PDFBOX-956) and
* sometimes remove characters that were not in fact
* duplicated (PDFBOX-1155). By default this is disabled.
*
* @deprecated use {@link #setPDFParserConfig(PDFParserConfig)}
*/
public void setSuppressDuplicateOverlappingText(boolean v) {
defaultConfig.setSuppressDuplicateOverlappingText(v);
}
/**
* @see #setSuppressDuplicateOverlappingText.
*
* @deprecated use {@link #getPDFParserConfig()}
*/
public boolean getSuppressDuplicateOverlappingText() {
return defaultConfig.getSuppressDuplicateOverlappingText();
}
/**
* If true, sort text tokens by their x/y position
* before extracting text. This may be necessary for
* some PDFs (if the text tokens are not rendered "in
* order"), while for other PDFs it can produce the
* wrong result (for example if there are 2 columns,
* the text will be interleaved). Default is false.
*
* @deprecated use {@link #setPDFParserConfig(PDFParserConfig)}
*/
public void setSortByPosition(boolean v) {
defaultConfig.setSortByPosition(v);
}
/**
* @see #setSortByPosition.
*
* @deprecated use {@link #getPDFParserConfig()}
*/
public boolean getSortByPosition() {
return defaultConfig.getSortByPosition();
}
}