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115 lines
4.2 KiB
115 lines
4.2 KiB
/*
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This file is part of Libresonic.
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Libresonic is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Libresonic is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Libresonic. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2016 (C) Libresonic Authors
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Based upon Subsonic, Copyright 2009 (C) Sindre Mehus
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*/
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package org.libresonic.player.filter;
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import org.libresonic.player.Logger;
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import org.libresonic.player.service.SettingsService;
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import javax.servlet.*;
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import javax.servlet.http.HttpServletRequest;
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import java.io.File;
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import java.io.IOException;
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import java.util.concurrent.atomic.AtomicBoolean;
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/**
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* This filter is executed very early in the filter chain. It verifies that
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* the Libresonic home directory (c:\libresonic or /var/libresonic) exists and
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* is writable. If not, a proper error message is given to the user.
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* <p/>
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* (The Libresonic home directory is usually created automatically, but a common
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* problem on Linux is that the Tomcat user does not have the necessary
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* privileges).
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*
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* @author Sindre Mehus
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*/
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public class BootstrapVerificationFilter implements Filter {
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private static final Logger LOG = Logger.getLogger(BootstrapVerificationFilter.class);
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private boolean libresonicHomeVerified = false;
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private final AtomicBoolean serverInfoLogged = new AtomicBoolean();
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public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
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throws IOException, ServletException {
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// Already verified?
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if (libresonicHomeVerified) {
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chain.doFilter(req, res);
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return;
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}
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File home = SettingsService.getLibresonicHome();
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if (!directoryExists(home)) {
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error(res, "<p>The directory <b>" + home + "</b> does not exist. Please create it and make it writable, " +
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"then restart the servlet container.</p>" +
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"<p>(You can override the directory location by specifying -Dlibresonic.home=... when " +
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"starting the servlet container.)</p>");
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} else if (!directoryWritable(home)) {
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error(res, "<p>The directory <b>" + home + "</b> is not writable. Please change file permissions, " +
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"then restart the servlet container.</p>" +
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"<p>(You can override the directory location by specifying -Dlibresonic.home=... when " +
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"starting the servlet container.)</p>");
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} else {
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libresonicHomeVerified = true;
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logServerInfo(req);
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chain.doFilter(req, res);
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}
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}
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private void logServerInfo(ServletRequest req) {
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if (!serverInfoLogged.getAndSet(true) && req instanceof HttpServletRequest) {
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String serverInfo = ((HttpServletRequest) req).getSession().getServletContext().getServerInfo();
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LOG.info("Servlet container: " + serverInfo);
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}
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}
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private boolean directoryExists(File dir) {
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return dir.exists() && dir.isDirectory();
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}
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private boolean directoryWritable(File dir) {
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try {
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File tempFile = File.createTempFile("test", null, dir);
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tempFile.delete();
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return true;
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} catch (IOException x) {
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return false;
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}
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}
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private void error(ServletResponse res, String error) throws IOException {
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ServletOutputStream out = res.getOutputStream();
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out.println("<html>" +
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"<head><title>Libresonic Error</title></head>" +
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"<body>" +
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"<h2>Libresonic Error</h2>" +
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error +
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"</body>" +
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"</html>");
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}
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public void init(FilterConfig filterConfig) {
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}
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public void destroy() {
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}
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}
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