com.google.gerrit.sshd.CommandModule Maven / Gradle / Ivy
// 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.lifecycle.LifecycleModule;
import com.google.gerrit.server.account.AccountAttributeLoader;
import com.google.inject.binder.LinkedBindingBuilder;
import org.apache.sshd.server.command.Command;
/** Module to register commands in the SSH daemon. */
public abstract class CommandModule extends LifecycleModule {
protected final boolean slaveMode;
protected CommandModule(boolean slaveMode) {
this.slaveMode = slaveMode;
}
/**
* Configure a command to be invoked by name.
*
* @param name the name of the command the client will provide in order to call the command.
* @return a binding that must be bound to a non-singleton provider for a {@link Command} object.
*/
protected LinkedBindingBuilder command(String name) {
factory(AccountAttributeLoader.Factory.class);
return bind(Commands.key(name));
}
/**
* Configure a command to be invoked by name.
*
* @param name the name of the command the client will provide in order to call the command.
* @return a binding that must be bound to a non-singleton provider for a {@link Command} object.
*/
protected LinkedBindingBuilder command(CommandName name) {
return bind(Commands.key(name));
}
/**
* Configure a command to be invoked by name.
*
* @param parent context of the parent command, that this command is a subcommand of.
* @param name the name of the command the client will provide in order to call the command.
* @return a binding that must be bound to a non-singleton provider for a {@link Command} object.
*/
protected LinkedBindingBuilder command(CommandName parent, String name) {
return bind(Commands.key(parent, name));
}
/**
* Configure a command to be invoked by name. The command is bound to the passed class.
*
* @param parent context of the parent command, that this command is a subcommand of.
* @param clazz class of the command with {@link CommandMetaData} annotation to retrieve the name
* and the description from
*/
protected void command(CommandName parent, Class clazz) {
CommandMetaData meta = clazz.getAnnotation(CommandMetaData.class);
if (meta == null) {
throw new IllegalStateException("no CommandMetaData annotation found");
}
if (meta.runsAt().isSupported(slaveMode)) {
bind(Commands.key(parent, meta.name(), meta.description())).to(clazz);
}
}
/**
* Alias one command to another. The alias is bound to the passed class.
*
* @param parent context of the parent command, that this command is a subcommand of.
* @param name the name of the command the client will provide in order to call the command.
* @param clazz class of the command with {@link CommandMetaData} annotation to retrieve the
* description from
*/
protected void alias(final CommandName parent, String name, Class clazz) {
CommandMetaData meta = clazz.getAnnotation(CommandMetaData.class);
if (meta == null) {
throw new IllegalStateException("no CommandMetaData annotation found");
}
bind(Commands.key(parent, name, meta.description())).to(clazz);
}
/**
* Alias one command to another.
*
* @param from the new command name that when called will actually delegate to {@code to}'s
* implementation.
* @param to name of an already registered command that will perform the action when {@code from}
* is invoked by a client.
*/
protected void alias(String from, String to) {
bind(Commands.key(from)).to(Commands.key(to));
}
}