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// Copyright (C) 2015 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.plugins;
import static com.google.gerrit.extensions.api.lfs.LfsDefinitions.CONTENTTYPE_VND_GIT_LFS_JSON;
import static java.nio.charset.StandardCharsets.UTF_8;
import static javax.servlet.http.HttpServletResponse.SC_NOT_IMPLEMENTED;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.httpd.resources.Resource;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.plugins.Plugin;
import com.google.gerrit.server.plugins.ReloadPluginListener;
import com.google.gerrit.server.plugins.StartPluginListener;
import com.google.gerrit.util.http.CacheHeaders;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.servlet.GuiceFilter;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import javax.servlet.FilterChain;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jgit.lib.Config;
@Singleton
public class LfsPluginServlet extends HttpServlet
implements StartPluginListener, ReloadPluginListener {
private static final long serialVersionUID = 1L;
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private static final String MESSAGE_LFS_NOT_CONFIGURED =
"{\"message\":\"No LFS plugin is configured to handle LFS requests.\"}";
private List<Plugin> pending = new ArrayList<>();
private final String pluginName;
private final FilterChain chain;
private AtomicReference<GuiceFilter> filter;
@Inject
LfsPluginServlet(@GerritServerConfig Config cfg) {
this.pluginName = cfg.getString("lfs", null, "plugin");
this.chain =
(req, res) -> Resource.NOT_FOUND.send((HttpServletRequest) req, (HttpServletResponse) res);
this.filter = new AtomicReference<>();
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
if (filter.get() == null) {
responseLfsNotConfigured(res);
return;
}
filter.get().doFilter(req, res, chain);
}
@Override
public synchronized void init(ServletConfig config) throws ServletException {
super.init(config);
for (Plugin plugin : pending) {
install(plugin);
}
pending = null;
}
@Override
public synchronized void onStartPlugin(Plugin plugin) {
if (pending != null) {
pending.add(plugin);
} else {
install(plugin);
}
}
@Override
public void onReloadPlugin(Plugin oldPlugin, Plugin newPlugin) {
install(newPlugin);
}
private void responseLfsNotConfigured(HttpServletResponse res) throws IOException {
CacheHeaders.setNotCacheable(res);
res.setContentType(CONTENTTYPE_VND_GIT_LFS_JSON);
res.setStatus(SC_NOT_IMPLEMENTED);
Writer w = new BufferedWriter(new OutputStreamWriter(res.getOutputStream(), UTF_8));
w.write(MESSAGE_LFS_NOT_CONFIGURED);
w.flush();
}
private void install(Plugin plugin) {
if (!plugin.getName().equals(pluginName)) {
return;
}
final GuiceFilter guiceFilter = load(plugin);
plugin.add(() -> filter.compareAndSet(guiceFilter, null));
filter.set(guiceFilter);
}
@Nullable
private GuiceFilter load(Plugin plugin) {
if (plugin.getHttpInjector() != null) {
final String name = plugin.getName();
final GuiceFilter guiceFilter;
try {
guiceFilter = plugin.getHttpInjector().getInstance(GuiceFilter.class);
} catch (RuntimeException e) {
logger.atWarning().withCause(e).log("Plugin %s cannot load GuiceFilter", name);
return null;
}
try {
ServletContext ctx = PluginServletContext.create(plugin, "/");
guiceFilter.init(new WrappedFilterConfig(ctx));
} catch (ServletException e) {
logger.atWarning().withCause(e).log("Plugin %s failed to initialize HTTP", name);
return null;
}
plugin.add(guiceFilter::destroy);
return guiceFilter;
}
return null;
}
}