/*
* 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.jena.fuseki.validation;
import java.io.IOException ;
import javax.servlet.ServletOutputStream ;
import javax.servlet.http.HttpServletRequest ;
import javax.servlet.http.HttpServletResponse ;
import org.openjena.atlas.io.IndentedLineBuffer ;
import org.openjena.atlas.io.IndentedWriter ;
import com.hp.hpl.jena.query.Query ;
import com.hp.hpl.jena.query.QueryFactory ;
import com.hp.hpl.jena.query.Syntax ;
import com.hp.hpl.jena.sparql.ARQException ;
import com.hp.hpl.jena.sparql.algebra.Algebra ;
import com.hp.hpl.jena.sparql.algebra.Op ;
import com.hp.hpl.jena.sparql.serializer.SerializationContext ;
public class QueryValidator extends ValidatorBase
{
public QueryValidator()
{ }
static final String paramLineNumbers = "linenumbers" ;
static final String paramFormat = "outputFormat" ;
static final String paramQuery = "query" ;
static final String paramSyntax = "languageSyntax" ;
//static final String paramSyntaxExtended = "extendedSyntax" ;
@Override
protected void execute(HttpServletRequest httpRequest, HttpServletResponse httpResponse)
{
try {
// if ( log.isInfoEnabled() )
// log.info("validation request") ;
String[] args = httpRequest.getParameterValues(paramQuery) ;
if ( args == null || args.length == 0 )
{
httpResponse.sendError(HttpServletResponse.SC_BAD_REQUEST, "No query parameter to validator") ;
return ;
}
if ( args.length > 1 )
{
httpResponse.sendError(HttpServletResponse.SC_BAD_REQUEST, "Too many query parameters") ;
return ;
}
final String queryString = httpRequest.getParameter(paramQuery).replaceAll("(\r|\n| )*$", "") ;
// queryString = queryString.replace("\r\n", "\n") ;
// queryString.replaceAll("(\r|\n| )*$", "") ;
String querySyntax = httpRequest.getParameter(paramSyntax) ;
if ( querySyntax == null || querySyntax.equals("") )
querySyntax = "SPARQL" ;
Syntax language = Syntax.lookup(querySyntax) ;
if ( language == null )
{
httpResponse.sendError(HttpServletResponse.SC_BAD_REQUEST, "Unknown syntax: "+querySyntax) ;
return ;
}
String lineNumbersArg = httpRequest.getParameter(paramLineNumbers) ;
String a[] = httpRequest.getParameterValues(paramFormat) ;
boolean outputSPARQL = false ;
boolean outputPrefix = false ;
boolean outputAlgebra = false ;
boolean outputQuads = false ;
if ( a != null )
{
for ( int i = 0 ; i < a.length ; i++ )
{
if ( a[i].equals("sparql") )
outputSPARQL = true ;
if ( a[i].equals("prefix") )
outputPrefix = true ;
if ( a[i].equals("algebra") )
outputAlgebra = true ;
if ( a[i].equals("quads") )
outputQuads = true ;
}
}
// if ( ! outputSPARQL && ! outputPrefix )
// outputSPARQL = true ;
boolean lineNumbers = true ;
if ( lineNumbersArg != null )
lineNumbers = lineNumbersArg.equalsIgnoreCase("true") || lineNumbersArg.equalsIgnoreCase("yes") ;
// Headers
setHeaders(httpResponse) ;
ServletOutputStream outStream = httpResponse.getOutputStream() ;
outStream.println("<html>") ;
printHead(outStream, "SPARQL Query Validation Report") ;
outStream.println("<body>") ;
outStream.println("<h1>SPARQL Query Validator</h1>") ;
// Print query as received
{
outStream.println("<p>Input:</p>") ;
// Not Java's finest hour.
Content c = new Content(){
@Override
public void print(IndentedWriter out)
{ out.print(queryString) ; }
} ;
output(outStream, c, lineNumbers) ;
}
// Attempt to parse it.
Query q = null ;
try {
q = QueryFactory.create(queryString, "http://example/base/", language) ;
} catch (ARQException ex)
{
// Over generous exception (should be QueryException)
// but this makes the code robust.
outStream.println("<p>Syntax error:</p>") ;
startFixed(outStream) ;
outStream.println(ex.getMessage()) ;
finishFixed(outStream) ;
}
catch (RuntimeException ex)
{
outStream.println("<p>Internal error:</p>") ;
startFixed(outStream) ;
outStream.println(ex.getMessage()) ;
finishFixed(outStream) ;
}
// Because we pass into anon inner classes
final Query query = q ;
// OK? Pretty print
if ( query != null && outputSPARQL )
{
outStream.println("<p>Formatted, parsed query:</p>") ;
Content c = new Content(){
@Override
public void print(IndentedWriter out)
{ query.serialize(out) ; }
} ;
output(outStream, c, lineNumbers) ;
}
if ( query != null && outputAlgebra )
{
outStream.println("<p>Algebra structure:</p>") ;
final Op op = Algebra.compile(query) ; // No optimization
final SerializationContext sCxt = new SerializationContext(query) ;
Content c = new Content(){
@Override
public void print(IndentedWriter out)
{ op.output(out, sCxt) ; }
} ;
output(outStream, c , lineNumbers) ;
}
if ( query != null && outputQuads )
{
outStream.println("<p>Quad structure:</p>") ;
final Op op = Algebra.toQuadForm(Algebra.compile(query)) ;
final SerializationContext sCxt = new SerializationContext(query) ;
Content c = new Content(){
@Override
public void print(IndentedWriter out)
{ op.output(out, sCxt) ; }
} ;
output(outStream, c , lineNumbers) ;
}
outStream.println("</html>") ;
} catch (Exception ex)
{
serviceLog.warn("Exception in doGet",ex) ;
}
}
interface Content { void print(IndentedWriter out) ; }
private void output(ServletOutputStream outStream, Content content, boolean lineNumbers) throws IOException
{
startFixed(outStream) ;
IndentedLineBuffer out = new IndentedLineBuffer(lineNumbers) ;
content.print(out) ;
out.flush() ;
String x = htmlQuote(out.asString()) ;
byte b[] = x.getBytes("UTF-8") ;
outStream.write(b) ;
finishFixed(outStream) ;
}
}