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The gateway server implementation.
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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.knox.gateway;
import org.apache.knox.gateway.audit.api.ActionOutcome;
import org.apache.knox.gateway.audit.api.AuditService;
import org.apache.knox.gateway.audit.api.AuditServiceFactory;
import org.apache.knox.gateway.audit.api.Auditor;
import org.apache.knox.gateway.audit.api.ResourceType;
import org.apache.knox.gateway.audit.log4j.audit.AuditConstants;
import org.apache.knox.gateway.i18n.resources.ResourcesFactory;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class GatewayForwardingServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
private static final String AUDIT_ACTION = "forward";
private static final GatewayResources RES = ResourcesFactory.get( GatewayResources.class );
private static AuditService auditService = AuditServiceFactory.getAuditService();
private static Auditor auditor = AuditServiceFactory.getAuditService()
.getAuditor( AuditConstants.DEFAULT_AUDITOR_NAME,
AuditConstants.KNOX_SERVICE_NAME, AuditConstants.KNOX_COMPONENT_NAME );
private String redirectToContext;
@Override
protected void doHead(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
@Override
protected void doPut(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
@Override
protected void doDelete(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
@Override
protected void doOptions(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
redirectToContext = config.getInitParameter("redirectTo");
}
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
String origPath = getRequestPath( request );
try {
auditService.createContext();
String origRequest = getRequestLine( request );
auditor.audit(
AUDIT_ACTION, origPath, ResourceType.URI,
ActionOutcome.UNAVAILABLE, RES.forwardToDefaultTopology( request.getMethod(), redirectToContext ) );
// Perform cross context dispatch to the configured topology context
ServletContext ctx = getServletContext().getContext(redirectToContext);
RequestDispatcher dispatcher = ctx.getRequestDispatcher(origRequest);
dispatcher.forward(request, response);
auditor.audit(
AUDIT_ACTION, origPath, ResourceType.URI,
ActionOutcome.SUCCESS, RES.responseStatus( response.getStatus() ) );
} catch( ServletException | IOException | RuntimeException e ) {
auditor.audit(
AUDIT_ACTION, origPath, ResourceType.URI,
ActionOutcome.FAILURE );
throw e;
} catch( Throwable e ) {
auditor.audit(
AUDIT_ACTION, origPath, ResourceType.URI,
ActionOutcome.FAILURE );
throw new ServletException(e);
} finally {
auditService.detachContext();
}
}
private static String getRequestPath( final HttpServletRequest request ) {
final String path = request.getPathInfo();
if( path == null ) {
return "";
} else {
return path;
}
}
private static String getRequestLine( final HttpServletRequest request ) {
final String path = getRequestPath( request );
final String query = request.getQueryString();
if( query == null ) {
return path;
} else {
return path + "?" + query;
}
}
}
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