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package com.sun.enterprise.web;
import java.io.IOException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.net.URL;
import java.net.MalformedURLException;
import java.util.concurrent.ConcurrentLinkedQueue;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.Request;
import org.apache.catalina.Response;
import org.apache.catalina.core.StandardPipeline;
import org.apache.catalina.util.StringManager;
import org.apache.tomcat.util.buf.UEncoder;
import org.apache.tomcat.util.buf.CharChunk;
import com.sun.logging.LogDomains;
/**
* Pipeline associated with a virtual server.
*
* This pipeline inherits the state (off/disabled) of its associated
* virtual server, and will abort execution and return an appropriate response
* error code if its associated virtual server is off or disabled.
*/
public class VirtualServerPipeline extends StandardPipeline {
private static final StringManager sm =
StringManager.getManager("com.sun.enterprise.web");
private static final Logger logger =
LogDomains.getLogger(LogDomains.WEB_LOGGER);
private VirtualServer vs;
private boolean isOff;
private boolean isDisabled;
private ArrayList<RedirectParameters> redirects;
private ConcurrentLinkedQueue<CharChunk> locations;
private ConcurrentLinkedQueue<UEncoder> urlEncoders;
/**
* Constructor.
*
* @param vs Virtual server with which this VirtualServerPipeline is being
* associated
*/
public VirtualServerPipeline(VirtualServer vs) {
super(vs);
this.vs = vs;
locations = new ConcurrentLinkedQueue<CharChunk>();
urlEncoders = new ConcurrentLinkedQueue<UEncoder>();
}
/**
* Processes the specified request, and produces the appropriate
* response, by invoking the first valve (if any) of this pipeline, or
* the pipeline's basic valve.
*
* @param request The request to process
* @param response The response to return
*/
public void invoke(Request request, Response response)
throws IOException, ServletException {
if (isOff) {
String msg = sm.getString("virtualServerValve.vsOff",
vs.getName());
if (logger.isLoggable(Level.FINE)) {
logger.fine(msg);
}
((HttpServletResponse) response.getResponse()).sendError(
HttpServletResponse.SC_NOT_FOUND,
msg);
} else if (isDisabled) {
String msg = sm.getString("virtualServerValve.vsDisabled",
vs.getName());
if (logger.isLoggable(Level.FINE)) {
logger.fine(msg);
}
((HttpServletResponse) response.getResponse()).sendError(
HttpServletResponse.SC_FORBIDDEN,
msg);
} else {
boolean redirect = false;
if (redirects != null) {
redirect = redirectIfNecessary(request, response);
}
if (!redirect) {
doInvoke(request, response);
}
}
}
/**
* Sets the <code>disabled</code> state of this VirtualServerPipeline.
*
* @param isDisabled true if the associated virtual server has been
* disabled, false otherwise
*/
void setIsDisabled(boolean isDisabled) {
this.isDisabled = isDisabled;
}
/**
* Sets the <code>off</code> state of this VirtualServerPipeline.
*
* @param isOff true if the associated virtual server is <code>off</code>,
* false otherwise
*/
void setIsOff(boolean isOff) {
this.isOff = isOff;
}
/**
* Adds the given redirect instruction to this VirtualServerPipeline.
*
* @param from URI prefix to match
* @param url Redirect URL to return to the client
* @param urlPrefix New URL prefix to return to the client
* @param escape true if redirect URL returned to the client is to be
* escaped, false otherwise
*/
void addRedirect(String from, String url, String urlPrefix,
boolean escape) {
if (redirects == null) {
redirects = new ArrayList<RedirectParameters>();
}
redirects.add(new RedirectParameters(from, url, urlPrefix, escape));
}
/**
* @return true if this VirtualServerPipeline has any redirects
* configured, and false otherwise.
*/
boolean hasRedirects() {
return ((redirects != null) && (redirects.size() > 0));
}
/**
* Clears all redirects.
*/
void clearRedirects() {
if (redirects != null) {
redirects.clear();
}
}
/**
* Checks to see if the given request needs to be redirected.
*
* @param request The request to process
* @param response The response to return
*
* @return true if redirect has occurred, false otherwise
*/
private boolean redirectIfNecessary(Request request, Response response)
throws IOException {
if (redirects == null) {
return false;
}
HttpServletRequest hreq = (HttpServletRequest) request.getRequest();
HttpServletResponse hres = (HttpServletResponse) request.getResponse();
String requestURI = hreq.getRequestURI();
RedirectParameters redirectMatch = null;
// Determine the longest 'from' URI prefix match
int size = redirects.size();
for (int i=0; i<size; i++) {
RedirectParameters elem = redirects.get(i);
if (requestURI.startsWith(elem.from)) {
if (redirectMatch != null) {
if (elem.from.length() > redirectMatch.from.length()) {
redirectMatch = elem;
}
} else {
redirectMatch = elem;
}
}
}
if (redirectMatch != null) {
// Redirect prefix match found, need to redirect
String location = null;
String uriSuffix = requestURI.substring(
redirectMatch.from.length());
if ("/".equals(redirectMatch.from)) {
uriSuffix = "/" + uriSuffix;
}
if (redirectMatch.urlPrefix != null) {
// Replace 'from' URI prefix with URL prefix
location = redirectMatch.urlPrefix + uriSuffix;
} else {
// Replace 'from' URI prefix with complete URL
location = redirectMatch.url;
}
String queryString = hreq.getQueryString();
if (queryString != null) {
location += queryString;
}
CharChunk locationCC = null;
UEncoder urlEncoder = null;
if (redirectMatch.isEscape) {
try {
URL url = new URL(location);
locationCC = locations.poll();
if (locationCC == null) {
locationCC = new CharChunk();
}
locationCC.append(url.getProtocol());
locationCC.append("://");
locationCC.append(url.getHost());
if (url.getPort() != -1) {
locationCC.append(":");
locationCC.append(String.valueOf(url.getPort()));
}
urlEncoder = urlEncoders.poll();
if (urlEncoder == null){
urlEncoder = new UEncoder();
urlEncoder.addSafeCharacter('/');
}
locationCC.append(urlEncoder.encodeURL(url.getPath()));
location = locationCC.toString();
} catch (MalformedURLException mue) {
logger.log(Level.WARNING,
"virtualServerPipeline.invalidRedirectLocation",
location);
} finally {
if (urlEncoder != null) {
urlEncoders.offer(urlEncoder);
}
if (locationCC != null) {
locationCC.recycle();
locations.offer(locationCC);
}
}
}
hres.sendRedirect(location);
return true;
}
return false;
}
/**
* Class representing redirect parameters
*/
static class RedirectParameters {
private String from;
private String url;
private String urlPrefix;
private boolean isEscape;
RedirectParameters(String from, String url, String urlPrefix,
boolean isEscape) {
this.from = from;
this.url = url;
this.urlPrefix = urlPrefix;
this.isEscape = isEscape;
}
}
}
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