/*
* 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.jetty;
import static java.lang.String.format ;
import java.io.* ;
import javax.servlet.http.HttpServletRequest ;
import javax.servlet.http.HttpServletResponse ;
import org.apache.jena.atlas.io.IO ;
import org.apache.jena.fuseki.Fuseki ;
import org.apache.jena.fuseki.servlets.ServletOps ;
import org.apache.jena.web.HttpSC ;
import org.eclipse.jetty.http.HttpMethod ;
import org.eclipse.jetty.http.MimeTypes ;
import org.eclipse.jetty.server.Request ;
import org.eclipse.jetty.server.Response ;
import org.eclipse.jetty.server.handler.ErrorHandler ;
/** The usual Fuseki error handler.
* Outputs a plain text message.
*/
public class FusekiErrorHandler extends ErrorHandler
{
public FusekiErrorHandler() {}
@Override
public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException
{
String method = request.getMethod();
if ( !method.equals(HttpMethod.GET.asString())
&& !method.equals(HttpMethod.POST.asString())
&& !method.equals(HttpMethod.HEAD.asString()) )
return ;
response.setContentType(MimeTypes.Type.TEXT_PLAIN_UTF_8.asString()) ;
ServletOps.setNoCache(response) ;
ByteArrayOutputStream bytes = new ByteArrayOutputStream(1024) ;
try ( Writer writer = IO.asUTF8(bytes) ) {
String reason=(response instanceof Response)?((Response)response).getReason():null;
handleErrorPage(request, writer, response.getStatus(), reason) ;
if ( ! Fuseki.VERSION.equalsIgnoreCase("development") &&
! Fuseki.VERSION.equals("${project.version}") )
{
writer.write("\n") ;
writer.write("\n") ;
writer.write(format("Fuseki - version %s (Build date: %s)\n", Fuseki.VERSION, Fuseki.BUILD_DATE)) ;
}
writer.flush();
response.setContentLength(bytes.size()) ;
// Copy :-(
response.getOutputStream().write(bytes.toByteArray()) ;
}
}
@Override
protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message)
throws IOException
{
if ( message == null )
message = HttpSC.getMessage(code) ;
writer.write(format("Error %d: %s\n", code, message)) ;
Throwable th = (Throwable)request.getAttribute("javax.servlet.error.exception");
while(th!=null)
{
writer.write("\n");
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
th.printStackTrace(pw);
pw.flush();
writer.write(sw.getBuffer().toString());
writer.write("\n");
th = th.getCause();
}
}
}