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