/*
* 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.client.auth.pubkey;
import java.io.IOException;
import java.nio.channels.Channel;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.stream.Stream;
import org.apache.sshd.agent.SshAgent;
import org.apache.sshd.agent.SshAgentFactory;
import org.apache.sshd.client.session.ClientSession;
import org.apache.sshd.common.FactoryManager;
import org.apache.sshd.common.keyprovider.KeyIdentityProvider;
import org.apache.sshd.common.signature.SignatureFactoriesManager;
import org.apache.sshd.common.util.GenericUtils;
/**
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class UserAuthPublicKeyIterator extends AbstractKeyPairIterator<PublicKeyIdentity> implements Channel {
private final AtomicBoolean open = new AtomicBoolean(true);
private Iterator<? extends PublicKeyIdentity> current;
private SshAgent agent;
public UserAuthPublicKeyIterator(ClientSession session, SignatureFactoriesManager signatureFactories) throws Exception {
super(session);
Collection<Stream<? extends PublicKeyIdentity>> identities = new LinkedList<>();
FactoryManager manager = Objects.requireNonNull(session.getFactoryManager(), "No session factory manager");
SshAgentFactory factory = manager.getAgentFactory();
if (factory != null) {
try {
agent = Objects.requireNonNull(factory.createClient(manager), "No agent created");
identities.add(agent.getIdentities().stream()
.map(kp -> new KeyAgentIdentity(agent, kp.getFirst(), kp.getSecond())));
} catch (Exception e) {
try {
closeAgent();
} catch (Exception err) {
e.addSuppressed(err);
}
throw e;
}
}
identities.add(Stream.of(KeyIdentityProvider.providerOf(session))
.map(KeyIdentityProvider::loadKeys)
.flatMap(GenericUtils::stream)
.map(kp -> new KeyPairIdentity(signatureFactories, session, kp)));
current = identities.stream().flatMap(r -> r).iterator();
}
@Override
public boolean hasNext() {
if (!isOpen()) {
return false;
}
return current.hasNext();
}
@Override
public PublicKeyIdentity next() {
if (!isOpen()) {
throw new NoSuchElementException("Iterator is closed");
}
return current.next();
}
@Override
public boolean isOpen() {
return open.get();
}
@Override
public void close() throws IOException {
if (open.getAndSet(false)) {
closeAgent();
}
}
protected void closeAgent() throws IOException {
if (agent != null) {
try {
agent.close();
} finally {
agent = null;
}
}
}
}