/*
This file is part of Airsonic.
Airsonic 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.
Airsonic 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 Airsonic. If not, see .
Copyright 2016 (C) Airsonic Authors
Based upon Subsonic, Copyright 2009 (C) Sindre Mehus
*/
package org.airsonic.player.filter;
import org.airsonic.player.service.SettingsService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* This filter is executed very early in the filter chain. It verifies that
* the Airsonic home directory (c:\airsonic or /var/airsonic) exists and
* is writable. If not, a proper error message is given to the user.
*
* (The Airsonic home directory is usually created automatically, but a common
* problem on Linux is that the Tomcat user does not have the necessary
* privileges).
*
* @author Sindre Mehus
*/
public class BootstrapVerificationFilter implements Filter {
private static final Logger LOG = LoggerFactory.getLogger(BootstrapVerificationFilter.class);
private boolean airsonicHomeVerified = false;
private final AtomicBoolean serverInfoLogged = new AtomicBoolean();
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
// Already verified?
if (airsonicHomeVerified) {
chain.doFilter(req, res);
return;
}
File home = SettingsService.getAirsonicHome();
if (!directoryExists(home)) {
error(res, "The directory " + home + " does not exist. Please create it and make it writable, " +
"then restart the servlet container.
" +
"(You can override the directory location by specifying -Dairsonic.home=... when " +
"starting the servlet container.)
");
} else if (!directoryWritable(home)) {
error(res, "The directory " + home + " is not writable. Please change file permissions, " +
"then restart the servlet container.
" +
"(You can override the directory location by specifying -Dairsonic.home=... when " +
"starting the servlet container.)
");
} else {
airsonicHomeVerified = true;
logServerInfo(req);
chain.doFilter(req, res);
}
}
private void logServerInfo(ServletRequest req) {
if (!serverInfoLogged.getAndSet(true) && req instanceof HttpServletRequest) {
String serverInfo = ((HttpServletRequest) req).getSession().getServletContext().getServerInfo();
LOG.info("Servlet container: " + serverInfo);
}
}
private boolean directoryExists(File dir) {
return dir.exists() && dir.isDirectory();
}
private boolean directoryWritable(File dir) {
try {
File tempFile = File.createTempFile("test", null, dir);
return tempFile.delete();
} catch (IOException x) {
return false;
}
}
private void error(ServletResponse res, String error) throws IOException {
ServletOutputStream out = res.getOutputStream();
out.println("" +
"Airsonic Error" +
"" +
"Airsonic Error
" +
error +
"" +
"");
}
public void init(FilterConfig filterConfig) {
}
public void destroy() {
}
}