// Copyright (C) 2009 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.sshd;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.sshd.args4j.SubcommandHandler;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.assistedinject.Assisted;
import org.apache.sshd.server.Command;
import org.apache.sshd.server.Environment;
import org.kohsuke.args4j.Argument;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Command that dispatches to a subcommand from its command table.
*/
final class DispatchCommand extends BaseCommand {
interface Factory {
DispatchCommand create(String prefix, Map<String, Provider<Command>> map);
}
private final Provider<CurrentUser> currentUser;
private final String prefix;
private final Map<String, Provider<Command>> commands;
private Command cmd;
@Argument(index = 0, required = true, metaVar = "COMMAND", handler = SubcommandHandler.class)
private String commandName;
@Argument(index = 1, multiValued = true, metaVar = "ARG")
private List<String> args = new ArrayList<String>();
@Inject
DispatchCommand(final Provider<CurrentUser> cu, @Assisted final String pfx,
@Assisted final Map<String, Provider<Command>> all) {
currentUser = cu;
prefix = pfx;
commands = all;
}
@Override
public void start(final Environment env) throws IOException {
try {
parseCommandLine();
final Provider<Command> p = commands.get(commandName);
if (p == null) {
String msg =
(prefix.isEmpty() ? "Gerrit Code Review" : prefix) + ": "
+ commandName + ": not found";
throw new UnloggedFailure(1, msg);
}
final Command cmd = p.get();
if (isAdminCommand(cmd) && !currentUser.get().isAdministrator()) {
final String msg = "fatal: Not a Gerrit administrator";
throw new UnloggedFailure(BaseCommand.STATUS_NOT_ADMIN, msg);
}
if (cmd instanceof BaseCommand) {
final BaseCommand bc = (BaseCommand) cmd;
if (prefix.isEmpty())
bc.setName(commandName);
else
bc.setName(prefix + " " + commandName);
bc.setArguments(args.toArray(new String[args.size()]));
} else if (!args.isEmpty()) {
throw new UnloggedFailure(1, commandName + " does not take arguments");
}
provideStateTo(cmd);
synchronized (this) {
this.cmd = cmd;
}
cmd.start(env);
} catch (UnloggedFailure e) {
String msg = e.getMessage();
if (!msg.endsWith("\n")) {
msg += "\n";
}
err.write(msg.getBytes(ENC));
err.flush();
onExit(e.exitCode);
}
}
private boolean isAdminCommand(final Command cmd) {
return cmd.getClass().getAnnotation(AdminCommand.class) != null;
}
@Override
public void destroy() {
synchronized (this) {
if (cmd != null) {
cmd.destroy();
cmd = null;
}
}
}
@Override
protected String usage() {
final StringBuilder usage = new StringBuilder();
usage.append("Available commands");
if (!prefix.isEmpty()) {
usage.append(" of ");
usage.append(prefix);
}
usage.append(" are:\n");
usage.append("\n");
for (Map.Entry<String, Provider<Command>> e : commands.entrySet()) {
usage.append(" ");
usage.append(e.getKey());
usage.append("\n");
}
usage.append("\n");
usage.append("See '");
if (prefix.indexOf(' ') < 0) {
usage.append(prefix);
usage.append(' ');
}
usage.append("COMMAND --help' for more information.\n");
usage.append("\n");
return usage.toString();
}
}