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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.
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/*
* {{{ header & license
* Copyright (c) 2004, 2005 Who?
*
* This program 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 program 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 program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* }}}
*/
package com.openhtmltopdf.resource;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.logging.Level;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.sax.SAXSource;
import com.openhtmltopdf.util.*;
import org.w3c.dom.Document;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
/**
* @author Patrick Wright
*/
public class XMLResource extends AbstractResource {
private Document document;
private static final XMLResourceBuilder XML_RESOURCE_BUILDER;
static {
XML_RESOURCE_BUILDER = new XMLResourceBuilder();
}
private XMLResource(InputStream stream) {
super(stream);
}
private XMLResource(InputSource source) {
super(source);
}
public static XMLResource load(InputStream stream) {
try (XMLResource resource = new XMLResource(stream)) {
return XML_RESOURCE_BUILDER.createXMLResource(resource);
} catch (IOException e) {
// Thrown on close failure.
return null;
}
}
public static XMLResource load(InputSource source) {
try (XMLResource resource = new XMLResource(source)) {
return XML_RESOURCE_BUILDER.createXMLResource(resource);
} catch (IOException e) {
// Thrown on close failure.
return null;
}
}
public static XMLResource load(Reader reader) {
try (XMLResource resource = new XMLResource(new InputSource(reader))) {
return XML_RESOURCE_BUILDER.createXMLResource(resource);
} catch (IOException e) {
// Thrown on close failure.
return null;
}
}
public Document getDocument() {
return document;
}
/*package*/ void setDocument(Document document) {
this.document = document;
}
public static final XMLReader newXMLReader() {
XMLReader xmlReader = null;
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
setSaxParserRequestedFeatures(factory);
SAXParser parser = factory.newSAXParser();
xmlReader = parser.getXMLReader();
} catch (Exception ex) {
XRLog.log(Level.INFO, LogMessageId.LogMessageId1Param.GENERAL_MESSAGE, ex.getMessage());
}
if (xmlReader == null) {
throw new XRRuntimeException("Could not instantiate any SAX 2 parser, including JDK default. " +
"The name of the class to use may have been read from the 'javax.xml.parsers.SAXParserFactory' System " +
"property, which is set to: " + System.getProperty("javax.xml.parsers.SAXParserFactory"));
}
XRLog.log(Level.INFO, LogMessageId.LogMessageId1Param.LOAD_SAX_XMLREADER_IN_USE, xmlReader.getClass().getName());
return xmlReader;
}
@FunctionalInterface
interface SetFeature {
void setFeature(String feature, T set) throws Exception;
}
private static boolean trySetFeature(
String feature,
T value,
SetFeature tryer) {
try {
tryer.setFeature(feature, value);
return true;
} catch (Exception e) {
XRLog.log(Level.WARNING, LogMessageId.LogMessageId2Param.XML_FEATURE_NOT_ABLE_TO_SET, feature, value, e);
return false;
}
}
private static void setSaxParserRequestedFeatures(SAXParserFactory factory) {
factory.setValidating(false);
factory.setNamespaceAware(true);
boolean b = true;
b &= trySetFeature("http://apache.org/xml/features/disallow-doctype-decl", false, factory::setFeature);
b &= trySetFeature("http://xml.org/sax/features/external-general-entities", false, factory::setFeature);
b &= trySetFeature("http://xml.org/sax/features/external-parameter-entities", false, factory::setFeature);
b &= trySetFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", true, factory::setFeature);
b &= trySetFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true, factory::setFeature);
if (!b) {
XRLog.log(Level.SEVERE, LogMessageId.LogMessageId0Param.LOAD_UNABLE_TO_DISABLE_XML_EXTERNAL_ENTITIES);
}
}
private static class XMLResourceBuilder {
private void setXmlReaderSecurityFeatures(XMLReader xmlReader) {
boolean b = true;
// VERY IMPORTANT: Without these lines, users can pull in arbitary files from the system using XXE.
// DO NOT REMOVE!
b &= trySetFeature("http://apache.org/xml/features/disallow-doctype-decl", false, xmlReader::setFeature);
b &= trySetFeature("http://xml.org/sax/features/external-general-entities", false, xmlReader::setFeature);
b &= trySetFeature("http://xml.org/sax/features/external-parameter-entities", false, xmlReader::setFeature);
b &= trySetFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", true, xmlReader::setFeature);
b &= trySetFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true, xmlReader::setFeature);
if (!b) {
XRLog.log(Level.SEVERE, LogMessageId.LogMessageId0Param.LOAD_UNABLE_TO_DISABLE_XML_EXTERNAL_ENTITIES);
}
}
private void setDocumentBuilderSecurityFeatures(DocumentBuilderFactory dbf) {
boolean b = true;
// VERY IMPORTANT: Without these lines, users can pull in arbitary files from the system using XXE.
// DO NOT REMOVE!
b &= trySetFeature("http://apache.org/xml/features/disallow-doctype-decl", false, dbf::setFeature);
b &= trySetFeature("http://xml.org/sax/features/external-general-entities", false, dbf::setFeature);
b &= trySetFeature("http://xml.org/sax/features/external-parameter-entities", false, dbf::setFeature);
b &= trySetFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false, dbf::setFeature);
b &= trySetFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true, dbf::setFeature);
if (!b) {
XRLog.log(Level.SEVERE, LogMessageId.LogMessageId0Param.LOAD_UNABLE_TO_DISABLE_XML_EXTERNAL_ENTITIES);
}
}
private void setTranformerFactorySecurityFeatures(TransformerFactory xformFactory) {
boolean b = true;
b &= trySetFeature(XMLConstants.ACCESS_EXTERNAL_DTD, "", xformFactory::setAttribute);
b &= trySetFeature(XMLConstants.ACCESS_EXTERNAL_STYLESHEET, "", xformFactory::setAttribute);
if (!b) {
XRLog.log(Level.SEVERE, LogMessageId.LogMessageId0Param.LOAD_UNABLE_TO_DISABLE_XML_EXTERNAL_ENTITIES);
}
}
private TransformerFactory loadPreferredTransformerFactory(String preferredImpl) {
try {
return TransformerFactory.newInstance(preferredImpl, null);
} catch (TransformerFactoryConfigurationError e) {
XRLog.log(Level.SEVERE, LogMessageId.LogMessageId1Param.LOAD_COULD_NOT_LOAD_PREFERRED_XML, "transformer");
return TransformerFactory.newInstance();
}
}
private DocumentBuilderFactory loadPreferredDocumentBuilderFactory(String preferredImpl) {
try {
return preferredImpl == null ? DocumentBuilderFactory.newInstance() : DocumentBuilderFactory.newInstance(preferredImpl, null);
} catch (FactoryConfigurationError e) {
XRLog.log(Level.SEVERE, LogMessageId.LogMessageId1Param.LOAD_COULD_NOT_LOAD_PREFERRED_XML, "document builder");
return DocumentBuilderFactory.newInstance();
}
}
private XMLResource createXMLResource(XMLResource target) {
Source input = null;
DOMResult output = null;
TransformerFactory xformFactory = null;
Transformer idTransform = null;
XMLReader xmlReader = null;
long st = 0L;
xmlReader = XMLResource.newXMLReader();
setXmlReaderSecurityFeatures(xmlReader);
addHandlers(xmlReader);
setParserFeatures(xmlReader);
st = System.currentTimeMillis();
try {
input = new SAXSource(xmlReader, target.getResourceInputSource());
String preferredDocumentBuilderFactory = ThreadCtx.get().sharedContext()._preferredDocumentBuilderFactoryImplementationClass;
DocumentBuilderFactory dbf = loadPreferredDocumentBuilderFactory(preferredDocumentBuilderFactory);
setDocumentBuilderSecurityFeatures(dbf);
dbf.setNamespaceAware(true);
dbf.setValidating(false); // validation is the root of all evil in xml - tobe
output = new DOMResult(dbf.newDocumentBuilder().newDocument());
String preferredTransformerFactory = ThreadCtx.get().sharedContext()._preferredTransformerFactoryImplementationClass;
if (preferredTransformerFactory == null) {
xformFactory = TransformerFactory.newInstance();
} else {
xformFactory = loadPreferredTransformerFactory(preferredTransformerFactory);
}
setTranformerFactorySecurityFeatures(xformFactory);
idTransform = xformFactory.newTransformer();
} catch (Exception ex) {
throw new XRRuntimeException(
"Failed on configuring SAX to DOM transformer.", ex);
}
try {
idTransform.transform(input, output);
} catch (Exception ex) {
throw new XRRuntimeException(
"Can't load the XML resource (using TRaX transformer). " + ex.getMessage(), ex);
}
long end = System.currentTimeMillis();
target.setElapsedLoadTime(end - st);
XRLog.log(Level.INFO, LogMessageId.LogMessageId1Param.LOAD_LOADED_DOCUMENT_TIME, target.getElapsedLoadTime());
target.setDocument((Document) output.getNode());
return target;
}
/**
* Adds the default EntityResolved and ErrorHandler for the SAX parser.
*/
private void addHandlers(XMLReader xmlReader) {
try {
// add our own entity resolver
xmlReader.setEntityResolver(FSEntityResolver.instance());
xmlReader.setErrorHandler(new ErrorHandler() {
public void error(SAXParseException ex) {
XRLog.log(Level.INFO, LogMessageId.LogMessageId1Param.LOAD_EXCEPTION_MESSAGE, ex.getMessage());
}
public void fatalError(SAXParseException ex) {
XRLog.log(Level.INFO, LogMessageId.LogMessageId1Param.LOAD_EXCEPTION_MESSAGE, ex.getMessage());
}
public void warning(SAXParseException ex) {
XRLog.log(Level.INFO, LogMessageId.LogMessageId1Param.LOAD_EXCEPTION_MESSAGE, ex.getMessage());
}
});
} catch (Exception ex) {
throw new XRRuntimeException("Failed on configuring SAX parser/XMLReader.", ex);
}
}
/**
* Sets all standard features for SAX parser.
*/
private void setParserFeatures(XMLReader xmlReader) {
boolean b = true;
b &= trySetFeature("http://xml.org/sax/features/validation", false, xmlReader::setFeature);
b &= trySetFeature("http://xml.org/sax/features/namespaces", true, xmlReader::setFeature);
if (!b) {
// nothing to do--some parsers will not allow setting features
XRLog.log(Level.WARNING, LogMessageId.LogMessageId0Param.LOAD_COULD_NOT_SET_VALIDATION_NAMESPACE_FEATURES_FOR_XML_PARSER);
}
}
}
}