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/*
* 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.tomcat.util.descriptor.tld;
import java.io.IOException;
import java.io.InputStream;
import java.security.AccessController;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.descriptor.Constants;
import org.apache.tomcat.util.descriptor.DigesterFactory;
import org.apache.tomcat.util.descriptor.XmlErrorHandler;
import org.apache.tomcat.util.digester.Digester;
import org.apache.tomcat.util.digester.RuleSet;
import org.apache.tomcat.util.security.PrivilegedGetTccl;
import org.apache.tomcat.util.security.PrivilegedSetTccl;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* Parses a Tag Library Descriptor.
*/
public class TldParser {
private final Log log = LogFactory.getLog(TldParser.class); // must not be static
private final Digester digester;
public TldParser(boolean namespaceAware, boolean validation,
boolean blockExternal) {
this(namespaceAware, validation, new TldRuleSet(), blockExternal);
}
public TldParser(boolean namespaceAware, boolean validation, RuleSet ruleSet,
boolean blockExternal) {
digester = DigesterFactory.newDigester(
validation, namespaceAware, ruleSet, blockExternal);
}
public TaglibXml parse(TldResourcePath path) throws IOException, SAXException {
ClassLoader original;
if (Constants.IS_SECURITY_ENABLED) {
PrivilegedGetTccl pa = new PrivilegedGetTccl();
original = AccessController.doPrivileged(pa);
} else {
original = Thread.currentThread().getContextClassLoader();
}
try (InputStream is = path.openStream()) {
if (Constants.IS_SECURITY_ENABLED) {
PrivilegedSetTccl pa = new PrivilegedSetTccl(TldParser.class.getClassLoader());
AccessController.doPrivileged(pa);
} else {
Thread.currentThread().setContextClassLoader(TldParser.class.getClassLoader());
}
XmlErrorHandler handler = new XmlErrorHandler();
digester.setErrorHandler(handler);
TaglibXml taglibXml = new TaglibXml();
digester.push(taglibXml);
InputSource source = new InputSource(path.toExternalForm());
source.setByteStream(is);
digester.parse(source);
if (!handler.getWarnings().isEmpty() || !handler.getErrors().isEmpty()) {
handler.logFindings(log, source.getSystemId());
if (!handler.getErrors().isEmpty()) {
// throw the first to indicate there was an error during processing
throw handler.getErrors().iterator().next();
}
}
return taglibXml;
} finally {
digester.reset();
if (Constants.IS_SECURITY_ENABLED) {
PrivilegedSetTccl pa = new PrivilegedSetTccl(original);
AccessController.doPrivileged(pa);
} else {
Thread.currentThread().setContextClassLoader(original);
}
}
}
public void setClassLoader(ClassLoader classLoader) {
digester.setClassLoader(classLoader);
}
}
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