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/*
* Copyright 2014 gitblit.com.
*
* 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.gitblit.transport.ssh;
import java.text.MessageFormat;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.gitblit.manager.IManager;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.CacheLoader.InvalidCacheLoadException;
import com.google.common.cache.LoadingCache;
/**
* Parent class for ssh public key managers.
*
* @author James Moger
*
*/
public abstract class IPublicKeyManager implements IManager {
protected final Logger log = LoggerFactory.getLogger(getClass());
protected final LoadingCache<String, List<SshKey>> keyCache = CacheBuilder
.newBuilder().
expireAfterAccess(15, TimeUnit.MINUTES).
maximumSize(100)
.build(new CacheLoader<String, List<SshKey>>() {
@Override
public List<SshKey> load(String username) {
List<SshKey> keys = getKeysImpl(username);
if (keys == null) {
return Collections.emptyList();
}
return Collections.unmodifiableList(keys);
}
});
@Override
public abstract IPublicKeyManager start();
public abstract boolean isReady();
@Override
public abstract IPublicKeyManager stop();
public final List<SshKey> getKeys(String username) {
try {
if (isStale(username)) {
keyCache.invalidate(username);
}
return keyCache.get(username);
} catch (InvalidCacheLoadException e) {
if (e.getMessage() == null || !e.getMessage().contains("returned null")) {
log.error(MessageFormat.format("failed to retrieve keys for {0}", username), e);
}
} catch (ExecutionException e) {
log.error(MessageFormat.format("failed to retrieve keys for {0}", username), e);
}
return null;
}
public final void renameUser(String oldName, String newName) {
List<SshKey> keys = getKeys(oldName);
if (keys == null || keys.isEmpty()) {
return;
}
removeAllKeys(oldName);
for (SshKey key : keys) {
addKey(newName, key);
}
}
protected abstract boolean isStale(String username);
protected abstract List<SshKey> getKeysImpl(String username);
public abstract boolean addKey(String username, SshKey key);
public abstract boolean removeKey(String username, SshKey key);
public abstract boolean removeAllKeys(String username);
}
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