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/*
This file is part of Subsonic.
Subsonic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Subsonic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.backend.controller;
import net.sourceforge.subsonic.backend.dao.RedirectionDao;
import net.sourceforge.subsonic.backend.domain.Redirection;
import static net.sourceforge.subsonic.backend.controller.RedirectionManagementController.RESERVED_REDIRECTS;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.view.RedirectView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Date;
import java.util.Enumeration;
import java.io.UnsupportedEncodingException;
/**
* Redirects vanity URLs (such as http://sindre.subsonic.org).
*
* @author Sindre Mehus
*/
public class RedirectionController implements Controller {
private static final Logger LOG = Logger.getLogger(RedirectionController.class);
private RedirectionDao redirectionDao;
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
String redirectFrom = getRedirectFrom(request);
if (RESERVED_REDIRECTS.containsKey(redirectFrom)) {
LOG.info("Reserved redirection: " + redirectFrom);
return new ModelAndView(new RedirectView(RESERVED_REDIRECTS.get(redirectFrom)));
}
Redirection redirection = redirectFrom == null ? null : redirectionDao.getRedirection(redirectFrom);
if (redirection == null) {
LOG.info("No redirection found: " + redirectFrom);
return new ModelAndView(new RedirectView("http://subsonic.org/pages"));
}
redirection.setLastRead(new Date());
redirection.setReadCount(redirection.getReadCount() + 1);
redirectionDao.updateRedirection(redirection);
// Check for trial expiration (unless called from REST client for which the Subsonic server manages trial expiry).
if (isTrialExpired(redirection) && !isREST(request)) {
LOG.info("Expired redirection: " + redirectFrom);
return new ModelAndView(new RedirectView("http://subsonic.org/pages/redirect-expired.jsp?redirectFrom=" +
redirectFrom + "&expired=" + redirection.getTrialExpires().getTime()));
}
String requestUrl = getFullRequestURL(request);
String to = StringUtils.removeEnd(getRedirectTo(request, redirection), "/");
String redirectTo = requestUrl.replaceFirst("http://" + redirectFrom + "\\.subsonic\\.org", to);
LOG.info("Redirecting from " + requestUrl + " to " + redirectTo);
return new ModelAndView(new RedirectView(redirectTo));
}
private String getRedirectTo(HttpServletRequest request, Redirection redirection) {
// If the request comes from within the same LAN as the destination Subsonic
// server, redirect using the local IP address of the server.
String localRedirectTo = redirection.getLocalRedirectTo();
if (localRedirectTo != null) {
try {
URL url = new URL(redirection.getRedirectTo());
if (url.getHost().equals(request.getRemoteAddr())) {
return localRedirectTo;
}
} catch (Throwable x) {
LOG.error("Malformed local redirect URL.", x);
}
}
return redirection.getRedirectTo();
}
private boolean isTrialExpired(Redirection redirection) {
return redirection.isTrial() && redirection.getTrialExpires() != null && redirection.getTrialExpires().before(new Date());
}
private boolean isREST(HttpServletRequest request) {
return request.getParameter("c") != null;
}
private String getFullRequestURL(HttpServletRequest request) throws UnsupportedEncodingException {
StringBuilder builder = new StringBuilder(request.getRequestURL());
// For backwards compatibility; return query parameters in exact same sequence.
if ("GET".equalsIgnoreCase(request.getMethod())) {
if (request.getQueryString() != null) {
builder.append("?").append(request.getQueryString());
}
return builder.toString();
}
builder.append("?");
Enumeration<?> paramNames = request.getParameterNames();
while (paramNames.hasMoreElements()) {
String paramName = (String) paramNames.nextElement();
String[] paramValues = request.getParameterValues(paramName);
for (String paramValue : paramValues) {
String p = URLEncoder.encode(paramValue, "UTF-8");
builder.append(paramName).append("=").append(p).append("&");
}
}
return builder.toString();
}
private String getRedirectFrom(HttpServletRequest request) throws MalformedURLException {
URL url = new URL(request.getRequestURL().toString());
String host = url.getHost();
String redirectFrom;
if (host.contains(".")) {
redirectFrom = StringUtils.substringBefore(host, ".");
} else {
// For testing.
redirectFrom = request.getParameter("redirectFrom");
}
return StringUtils.lowerCase(redirectFrom);
}
public void setRedirectionDao(RedirectionDao redirectionDao) {
this.redirectionDao = redirectionDao;
}
}
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