// ========================================================================
// $Id$
// Copyright (c) 2004-2009 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 javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.HandlerWrapper;
/* ------------------------------------------------------------ */
/**
*<p> Rewrite handler is responsible for managing the rules. Its capabilities
* is not only limited for URL rewrites such as RewritePatternRule or RewriteRegexRule.
* There is also handling for cookies, headers, redirection, setting status or error codes
* whenever the rule finds a match.
*
* <p> The rules can be matched by the either: pattern matching of PathMap
* (eg {@link PatternRule}), regular expressions (eg {@link RegexRule}) or certain conditions set
* (eg {@link MsieSslRule} - the requests must be in SSL mode).
*
* <p> The rules can be grouped into rule containers (class {@link RuleContainer}), and will only
* be applied if the request matches the conditions for their container
* (e.g., by virtual host name)
*
* <p>The list of predefined rules is:
* <ul>
* <li> {@link CookiePatternRule} - adds a new cookie in response. </li>
* <li> {@link HeaderPatternRule} - adds/modifies the HTTP headers in response. </li>
* <li> {@link RedirectPatternRule} - sets the redirect location. </li>
* <li> {@link ResponsePatternRule} - sets the status/error codes. </li>
* <li> {@link RewritePatternRule} - rewrites the requested URI. </li>
* <li> {@link RewriteRegexRule} - rewrites the requested URI using regular expression for pattern matching. </li>
* <li> {@link ProxyRule} - proxies the requested URI to the host defined in proxyTo. </li>
* <li> {@link MsieSslRule} - disables the keep alive on SSL for IE5 and IE6. </li>
* <li> {@link LegacyRule} - the old version of rewrite. </li>
* <li> {@link ForwardedSchemeHeaderRule} - set the scheme according to the headers present. </li>
* <li> {@link VirtualHostRuleContainer} - checks whether the request matches one of a set of virtual host names.</li>
* </ul>
*
*
* Here is a typical jetty.xml configuration would be: <pre>
*
* <New id="RewriteHandler" class="org.eclipse.jetty.rewrite.handler.RewriteHandler">
* <Set name="rules">
* <Array type="org.eclipse.jetty.rewrite.handler.Rule">
*
* <Item>
* <New id="rewrite" class="org.eclipse.jetty.rewrite.handler.RewritePatternRule">
* <Set name="pattern">/*</Set>
* <Set name="replacement">/test</Set>
* </New>
* </Item>
*
* <Item>
* <New id="rewrite" class="org.eclipse.jetty.rewrite.handler.ProxyRule">
* <Set name="pattern">/*</Set>
* <Set name="proxyTo">http://webtide.com:8080</Set>
* </New>
* </Item>
*
* <Item>
* <New id="response" class="org.eclipse.jetty.rewrite.handler.ResponsePatternRule">
* <Set name="pattern">/session/</Set>
* <Set name="code">400</Set>
* <Set name="reason">Setting error code 400</Set>
* </New>
* </Item>
*
* <Item>
* <New id="header" class="org.eclipse.jetty.rewrite.handler.HeaderPatternRule">
* <Set name="pattern">*.jsp</Set>
* <Set name="name">server</Set>
* <Set name="value">dexter webserver</Set>
* </New>
* </Item>
*
* <Item>
* <New id="header" class="org.eclipse.jetty.rewrite.handler.HeaderPatternRule">
* <Set name="pattern">*.jsp</Set>
* <Set name="name">title</Set>
* <Set name="value">driven header purpose</Set>
* </New>
* </Item>
*
* <Item>
* <New id="redirect" class="org.eclipse.jetty.rewrite.handler.RedirectPatternRule">
* <Set name="pattern">/test/dispatch</Set>
* <Set name="location">http://jetty.eclipse.org</Set>
* </New>
* </Item>
*
* <Item>
* <New id="regexRewrite" class="org.eclipse.jetty.rewrite.handler.RewriteRegexRule">
* <Set name="regex">/test-jaas/$</Set>
* <Set name="replacement">/demo</Set>
* </New>
* </Item>
*
* <Item>
* <New id="forwardedHttps" class="org.eclipse.jetty.rewrite.handler.ForwardedSchemeHeaderRule">
* <Set name="header">X-Forwarded-Scheme</Set>
* <Set name="headerValue">https</Set>
* <Set name="scheme">https</Set>
* </New>
* </Item>
*
* <Item>
* <New id="virtualHost" class="org.eclipse.jetty.rewrite.handler.VirtualHostRuleContainer">
*
* <Set name="virtualHosts">
* <Array type="java.lang.String">
* <Item>eclipse.com</Item>
* <Item>www.eclipse.com</Item>
* <Item>eclipse.org</Item>
* <Item>www.eclipse.org</Item>
* </Array>
* </Set>
*
* <Call name="addRule">
* <Arg>
* <New class="org.eclipse.jetty.rewrite.handler.CookiePatternRule">
* <Set name="pattern">/*</Set>
* <Set name="name">CookiePatternRule</Set>
* <Set name="value">1</Set>
* </New>
* </Arg>
* </Call>
*
* </New>
* </Item>
*
* </Array>
* </Set>
* </New>
*
* <Set name="handler">
* <New id="Handlers" class="org.eclipse.jetty.server.handler.HandlerCollection">
* <Set name="handlers">
* <Array type="org.eclipse.jetty.server.Handler">
* <Item>
* <Ref id="RewriteHandler"/>
* </Item>
* <Item>
* <New id="Contexts" class="org.eclipse.jetty.server.handler.ContextHandlerCollection"/>
* </Item>
* <Item>
* <New id="DefaultHandler" class="org.eclipse.jetty.server.handler.DefaultHandler"/>
* </Item>
* <Item>
* <New id="RequestLog" class="org.eclipse.jetty.server.handler.RequestLogHandler"/>
* </Item>
* </Array>
* </Set>
* </New>
* </Set>
* </pre>
*
*/
public class RewriteHandler extends HandlerWrapper
{
private RuleContainer _rules;
/* ------------------------------------------------------------ */
public RewriteHandler()
{
_rules = new RuleContainer();
}
/* ------------------------------------------------------------ */
/**
* To enable configuration from jetty.xml on rewriteRequestURI, rewritePathInfo and
* originalPathAttribute
*
* @param legacyRule old style rewrite rule
*/
@Deprecated
public void setLegacyRule(LegacyRule legacyRule)
{
_rules.setLegacyRule(legacyRule);
}
/* ------------------------------------------------------------ */
/**
* Returns the list of rules.
* @return an array of {@link Rule}.
*/
public Rule[] getRules()
{
return _rules.getRules();
}
/* ------------------------------------------------------------ */
/**
* Assigns the rules to process.
* @param rules an array of {@link Rule}.
*/
public void setRules(Rule[] rules)
{
_rules.setRules(rules);
}
/*------------------------------------------------------------ */
/**
* Assigns the rules to process.
* @param rules a {@link RuleContainer} containing other rules to process
*/
public void setRules(RuleContainer rules)
{
_rules = rules;
}
/* ------------------------------------------------------------ */
/**
* Add a Rule
* @param rule The rule to add to the end of the rules array
*/
public void addRule(Rule rule)
{
_rules.addRule(rule);
}
/* ------------------------------------------------------------ */
/**
* @return the rewriteRequestURI If true, this handler will rewrite the value
* returned by {@link HttpServletRequest#getRequestURI()}.
*/
public boolean isRewriteRequestURI()
{
return _rules.isRewriteRequestURI();
}
/* ------------------------------------------------------------ */
/**
* @param rewriteRequestURI true if this handler will rewrite the value
* returned by {@link HttpServletRequest#getRequestURI()}.
*/
public void setRewriteRequestURI(boolean rewriteRequestURI)
{
_rules.setRewriteRequestURI(rewriteRequestURI);
}
/* ------------------------------------------------------------ */
/**
* @return true if this handler will rewrite the value
* returned by {@link HttpServletRequest#getPathInfo()}.
*/
public boolean isRewritePathInfo()
{
return _rules.isRewritePathInfo();
}
/* ------------------------------------------------------------ */
/**
* @param rewritePathInfo true if this handler will rewrite the value
* returned by {@link HttpServletRequest#getPathInfo()}.
*/
public void setRewritePathInfo(boolean rewritePathInfo)
{
_rules.setRewritePathInfo(rewritePathInfo);
}
/* ------------------------------------------------------------ */
/**
* @return the originalPathAttribte. If non null, this string will be used
* as the attribute name to store the original request path.
*/
public String getOriginalPathAttribute()
{
return _rules.getOriginalPathAttribute();
}
/* ------------------------------------------------------------ */
/**
* @param originalPathAttribute If non null, this string will be used
* as the attribute name to store the original request path.
*/
public void setOriginalPathAttribute(String originalPathAttribute)
{
_rules.setOriginalPathAttribute(originalPathAttribute);
}
/* ------------------------------------------------------------ */
/* (non-Javadoc)
* @see org.eclipse.jetty.server.handler.HandlerWrapper#handle(java.lang.String, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
*/
@Override
public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
if (isStarted())
{
String returned = _rules.matchAndApply(target, request, response);
target = (returned == null) ? target : returned;
if (!baseRequest.isHandled())
super.handle(target, baseRequest, request, response);
}
}
}