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Enable analysis and reporting on XML files.
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/*
* SonarQube XML Plugin
* Copyright (C) 2010 SonarSource
* [email protected]
*
* Licensed 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.sonar.plugins.xml.checks;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.xerces.impl.Constants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sonar.api.utils.SonarException;
import org.sonar.check.Cardinality;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.check.RuleProperty;
import org.sonar.plugins.xml.parsers.DetectSchemaParser;
import org.sonar.plugins.xml.parsers.DetectSchemaParser.Doctype;
import org.sonar.plugins.xml.schemas.SchemaResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.SAXParseException;
import javax.xml.XMLConstants;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Perform schema check using xerces parser.
*
* @author Matthijs Galesloot
*/
@Rule(key = "XmlSchemaCheck", priority = Priority.MAJOR,
cardinality = Cardinality.MULTIPLE)
public class XmlSchemaCheck extends AbstractXmlCheck {
/**
* filePattern indicates which files should be checked.
*/
@RuleProperty(key = "filePattern")
private String filePattern;
/**
* schemas may refer to a schema that is provided as a built-in resource, a web resource or a file resource.
*/
@RuleProperty(key = "schemas", defaultValue = "autodetect", type = "TEXT")
private String schemas;
private static final Logger LOG = LoggerFactory.getLogger(XmlSchemaCheck.class);
private static final Map CACHED_SCHEMAS = new HashMap();
/**
* MessageHandler creates violations for errors and warnings. The handler is assigned to {@link Validator} to catch the errors and
* warnings raised by the validator.
*/
private class MessageHandler implements ErrorHandler {
private void createViolation(SAXParseException e) {
XmlSchemaCheck.this.createViolation(e.getLineNumber(), e.getLocalizedMessage());
if (e.getLocalizedMessage().contains(UnrecoverableParseError.FAILUREMESSAGE)) {
throw new UnrecoverableParseError(e);
}
}
public void error(SAXParseException e) throws SAXException {
createViolation(e);
}
public void fatalError(SAXParseException e) throws SAXException {
createViolation(e);
}
public void warning(SAXParseException e) throws SAXException {
createViolation(e);
}
}
/**
* Exception for a parse error from which the parser cannot recover.
*/
private static class UnrecoverableParseError extends RuntimeException {
static final String FAILUREMESSAGE = "The reference to entity \"null\"";
private static final long serialVersionUID = 1L;
public UnrecoverableParseError(SAXParseException e) {
super(e);
}
}
/**
* Create xsd schema for a list of schema's.
*/
private static Schema createSchema(String[] schemaList) {
final String cacheKey = StringUtils.join(schemaList, ",");
// first try to load a cached schema.
Schema schema = CACHED_SCHEMAS.get(cacheKey);
if (schema != null) {
return schema;
}
List schemaSources = new ArrayList();
// load each schema in a StreamSource.
for (String schemaReference : schemaList) {
InputStream input = SchemaResolver.getBuiltinSchema(schemaReference);
if (input == null) {
throw new SonarException("Could not load schema: " + schemaReference);
}
schemaSources.add(new StreamSource(input));
}
// create a schema for the list of StreamSources.
try {
SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
schemaFactory.setResourceResolver(new SchemaResolver());
schema = schemaFactory.newSchema(schemaSources.toArray(new Source[schemaSources.size()]));
CACHED_SCHEMAS.put(cacheKey, schema);
return schema;
} catch (SAXException e) {
throw new SonarException(e);
}
}
private void autodetectSchemaAndValidate() {
final Doctype doctype = detectSchema();
// first try doctype as this is more specific
if (doctype.getDtd() != null) {
InputStream input = SchemaResolver.getBuiltinSchema(doctype.getDtd());
if (input == null) {
LOG.error("Could not validate " + getWebSourceCode().toString() + " for doctype " + doctype.getDtd());
} else {
IOUtils.closeQuietly(input);
validate(new String[]{doctype.getDtd()});
}
}
// try namespace
else if (doctype.getNamespace() != null && !StringUtils.isEmpty(doctype.getNamespace())) {
validate(new String[]{doctype.getNamespace()});
} else {
LOG.info("Could not autodetect schema for " + getWebSourceCode().toString() + ", skip validation.");
}
}
/**
* Checks if a certain message has already been raised. Avoids duplicate messages.
*/
private boolean containsMessage(SAXException e) {
if (e instanceof SAXParseException) {
SAXParseException spe = (SAXParseException) e;
for (XmlIssue i : getWebSourceCode().getXmlIssues()) {
if (i.getLine() == spe.getLineNumber() && i.getMessage().equals(spe.getMessage())) {
return true;
}
}
}
return false;
}
private Doctype detectSchema() {
return new DetectSchemaParser().findDoctype(getWebSourceCode().createInputStream());
}
public String getFilePattern() {
return filePattern;
}
public String getSchemas() {
return schemas;
}
private void setFeature(Validator validator, String feature, boolean value) {
try {
validator.setFeature(feature, value);
} catch (SAXNotRecognizedException e) {
throw new SonarException(e);
} catch (SAXNotSupportedException e) {
throw new SonarException(e);
}
}
public void setFilePattern(String filePattern) {
this.filePattern = filePattern;
}
public void setSchemas(String schemas) {
this.schemas = schemas;
}
private void validate() {
if ("autodetect".equalsIgnoreCase(schemas)) {
autodetectSchemaAndValidate();
} else {
String[] schemaList = StringUtils.split(schemas, " \t\n");
validate(schemaList);
}
}
private void validate(String[] schemaList) {
// Create a new validator
Validator validator = createSchema(schemaList).newValidator();
setFeature(validator, Constants.XERCES_FEATURE_PREFIX + "continue-after-fatal-error", true);
validator.setErrorHandler(new MessageHandler());
validator.setResourceResolver(new SchemaResolver());
// Validate and catch the exceptions. MessageHandler will receive the errors and warnings.
try {
LOG.info("Validate " + getWebSourceCode() + " with schema " + StringUtils.join(schemaList, ","));
validator.validate(new StreamSource(getWebSourceCode().createInputStream()));
} catch (SAXException e) {
if (!containsMessage(e)) {
createViolation(0, e.getMessage());
}
} catch (IOException e) {
throw new SonarException(e);
} catch (UnrecoverableParseError e) {
// ignore, message already reported.
}
}
@Override
public void validate(XmlSourceCode xmlSourceCode) {
setWebSourceCode(xmlSourceCode);
if (schemas != null && isFileIncluded(filePattern)) {
validate();
}
}
}