/*
* 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.util.test;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import org.apache.sshd.common.Factory;
import org.apache.sshd.common.channel.BufferedIoOutputStream;
import org.apache.sshd.common.channel.Window;
import org.apache.sshd.common.io.IoInputStream;
import org.apache.sshd.common.io.IoOutputStream;
import org.apache.sshd.common.session.Session;
import org.apache.sshd.common.util.buffer.ByteArrayBuffer;
import org.apache.sshd.server.AsyncCommand;
import org.apache.sshd.server.ChannelSessionAware;
import org.apache.sshd.server.Command;
import org.apache.sshd.server.Environment;
import org.apache.sshd.server.ExitCallback;
import org.apache.sshd.server.channel.ChannelDataReceiver;
import org.apache.sshd.server.channel.ChannelSession;
/**
* TODO Add javadoc
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class AsyncEchoShellFactory implements Factory<Command> {
@Override
public Command create() {
return new EchoShell();
}
public static class EchoShell implements AsyncCommand, ChannelDataReceiver, ChannelSessionAware {
private IoOutputStream out;
private IoOutputStream err;
private ExitCallback callback;
private Environment environment;
private ChannelSession session;
private StringBuilder buffer = new StringBuilder();
public IoOutputStream getOut() {
return out;
}
public IoOutputStream getErr() {
return err;
}
public Environment getEnvironment() {
return environment;
}
@Override
public void setInputStream(InputStream in) {
// ignored
}
@Override
public void setOutputStream(OutputStream out) {
// ignored
}
@Override
public void setErrorStream(OutputStream err) {
// ignored
}
@Override
public void setIoInputStream(IoInputStream in) {
// ignored
}
@Override
public void setIoOutputStream(IoOutputStream out) {
this.out = new BufferedIoOutputStream(out);
}
@Override
public void setIoErrorStream(IoOutputStream err) {
this.err = new BufferedIoOutputStream(err);
}
@Override
public void setExitCallback(ExitCallback callback) {
this.callback = callback;
}
@Override
public void setChannelSession(ChannelSession session) {
this.session = session;
}
@Override
public void start(Environment env) throws IOException {
environment = env;
session.setDataReceiver(this);
}
@Override
public void close() throws IOException {
out.close(false).addListener(future -> callback.onExit(0));
}
@Override
public void destroy() {
// ignored
}
@Override
public int data(final ChannelSession channel, byte[] buf, int start, int len) throws IOException {
buffer.append(new String(buf, start, len, StandardCharsets.UTF_8));
for (int i = 0; i < buffer.length(); i++) {
if (buffer.charAt(i) == '\n') {
final String s = buffer.substring(0, i + 1);
final byte[] bytes = s.getBytes(StandardCharsets.UTF_8);
out.write(new ByteArrayBuffer(bytes)).addListener(future -> {
Session session1 = channel.getSession();
if (future.isWritten()) {
try {
Window wLocal = channel.getLocalWindow();
wLocal.consumeAndCheck(bytes.length);
} catch (IOException e) {
session1.exceptionCaught(e);
}
} else {
Throwable t = future.getException();
session1.exceptionCaught(t);
}
});
buffer = new StringBuilder(buffer.substring(i + 1));
i = 0;
}
}
return 0;
}
}
}