org.eclipse.jetty.rewrite.handler.RewriteRegexRule Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.rewrite.handler;
import java.io.IOException;
import java.util.regex.Matcher;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.HttpURI;
import org.eclipse.jetty.server.Request;
/**
* Rewrite the URI by matching with a regular expression.
* The replacement string may use $n" to replace the nth capture group.
* If the replacement string contains ? character, then it is split into a path
* and query string component. The replacement query string may also contain $Q, which
* is replaced with the original query string.
* The returned target contains only the path.
*/
public class RewriteRegexRule extends RegexRule implements Rule.ApplyURI
{
private String _replacement;
private String _query;
private boolean _queryGroup;
/* ------------------------------------------------------------ */
public RewriteRegexRule()
{
_handling = false;
_terminating = false;
}
/* ------------------------------------------------------------ */
/**
* Whenever a match is found, it replaces with this value.
*
* @param replacement the replacement string.
*/
public void setReplacement(String replacement)
{
String[] split=replacement.split("\\?",2);
_replacement = split[0];
_query=split.length==2?split[1]:null;
_queryGroup=_query!=null && _query.contains("$Q");
}
/* ------------------------------------------------------------ */
/* (non-Javadoc)
* @see org.eclipse.jetty.server.handler.rules.RegexRule#apply(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.util.regex.Matcher)
*/
public String apply(String target, HttpServletRequest request, HttpServletResponse response, Matcher matcher) throws IOException
{
target=_replacement;
String query=_query;
for (int g=1;g<=matcher.groupCount();g++)
{
String group=matcher.group(g);
if (group==null)
group="";
else
group = Matcher.quoteReplacement(group);
target=target.replaceAll("\\$"+g,group);
if (query!=null)
query=query.replaceAll("\\$"+g,group);
}
if (query!=null)
{
if (_queryGroup)
query=query.replace("$Q",request.getQueryString()==null?"":request.getQueryString());
request.setAttribute("org.eclipse.jetty.rewrite.handler.RewriteRegexRule.Q",query);
}
return target;
}
/* ------------------------------------------------------------ */
public void applyURI(Request request, String oldTarget, String newTarget) throws IOException
{
if (_query==null)
{
request.setRequestURI(newTarget);
}
else
{
String query=(String)request.getAttribute("org.eclipse.jetty.rewrite.handler.RewriteRegexRule.Q");
if (!_queryGroup && request.getQueryString()!=null)
query=request.getQueryString()+"&"+query;
HttpURI uri=new HttpURI(newTarget+"?"+query);
request.setUri(uri);
request.setRequestURI(newTarget);
request.setQueryString(query);
}
}
/* ------------------------------------------------------------ */
/**
* Returns the replacement string.
*/
public String toString()
{
return super.toString()+"["+_replacement+"]";
}
}
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