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// Copyright (C) 2008 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.httpd.raw;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.gerrit.server.ssh.SshInfo;
import com.google.gwtexpui.server.CacheHeaders;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.jcraft.jsch.HostKey;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet hosting an SSH daemon on another port. During a standard HTTP GET request the servlet
* returns the hostname and port number back to the client in the form <code>${host} ${port}</code>.
*
* <p>Use a Git URL such as <code>ssh://${email}@${host}:${port}/${path}</code>, e.g. {@code
* ssh://sop@google.com@gerrit.com:8010/tools/gerrit.git} to access the SSH daemon itself.
*
* <p>Versions of Git before 1.5.3 may require setting the username and port properties in the
* user's {@code ~/.ssh/config} file, and using a host alias through a URL such as {@code
* gerrit-alias:/tools/gerrit.git}:
*
* <pre>{@code
* Host gerrit-alias
* User sop@google.com
* Hostname gerrit.com
* Port 8010
* }</pre>
*/
@Singleton
public class SshInfoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private final SshInfo sshd;
@Inject
SshInfoServlet(SshInfo daemon) {
sshd = daemon;
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
final List<HostKey> hostKeys = sshd.getHostKeys();
final String out;
if (!hostKeys.isEmpty()) {
String host = hostKeys.get(0).getHost();
String port = "22";
if (host.contains(":")) {
final int p = host.lastIndexOf(':');
port = host.substring(p + 1);
host = host.substring(0, p);
}
if (host.equals("*")) {
host = req.getServerName();
} else if (host.startsWith("[") && host.endsWith("]")) {
host = host.substring(1, host.length() - 1);
}
out = host + " " + port;
} else {
out = "NOT_AVAILABLE";
}
CacheHeaders.setNotCacheable(rsp);
rsp.setCharacterEncoding(UTF_8.name());
rsp.setContentType("text/plain");
try (PrintWriter w = rsp.getWriter()) {
w.write(out);
}
}
}
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