/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.sshd.server.scp;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
import org.apache.sshd.common.util.ValidateUtils;
import org.apache.sshd.server.Command;
import org.apache.sshd.server.Environment;
import org.apache.sshd.server.ExitCallback;
/**
* Implementation of an unknown command that can be returned by <code>CommandFactory</code>
* when the command is not known, as it is supposed to always
* return a valid <code>Command</code> object.
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class UnknownCommand implements Command, Runnable {
private final String command;
private final String message;
@SuppressWarnings("unused")
private InputStream in;
@SuppressWarnings("unused")
private OutputStream out;
private OutputStream err;
private ExitCallback callback;
public UnknownCommand(String command) {
this.command = ValidateUtils.checkNotNullAndNotEmpty(command, "No command");
this.message = "Unknown command: " + command;
}
public String getCommand() {
return command;
}
public String getMessage() {
return message;
}
@Override
public void setInputStream(InputStream in) {
this.in = in;
}
@Override
public void setOutputStream(OutputStream out) {
this.out = out;
}
@Override
public void setErrorStream(OutputStream err) {
this.err = err;
}
@Override
public void setExitCallback(ExitCallback callback) {
this.callback = callback;
}
@Override
public void run() {
String errorMessage = getMessage();
try {
try {
err.write(errorMessage.getBytes(StandardCharsets.UTF_8));
err.write('\n');
} finally {
err.flush();
}
} catch (IOException e) {
// ignored
}
if (callback != null) {
callback.onExit(1, errorMessage);
}
}
@Override
public void start(Environment env) throws IOException {
Thread thread = new Thread(this);
thread.setDaemon(true);
thread.start();
}
@Override
public void destroy() {
// ignored
}
@Override
public int hashCode() {
return Objects.hashCode(getCommand());
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (obj == this) {
return true;
}
if (getClass() != obj.getClass()) {
return false;
}
return Objects.equals(this.getCommand(), ((UnknownCommand) obj).getCommand());
}
@Override
public String toString() {
return getMessage();
}
}