/*
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* Copyright 2014 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.gitblit.transport.ssh;
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import java.text.MessageFormat;
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import java.util.Collections;
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import java.util.List;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.TimeUnit;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.gitblit.manager.IManager;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.CacheLoader.InvalidCacheLoadException;
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import com.google.common.cache.LoadingCache;
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/**
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* Parent class for ssh public key managers.
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*
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* @author James Moger
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*
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*/
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public abstract class IPublicKeyManager implements IManager {
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protected final Logger log = LoggerFactory.getLogger(getClass());
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protected final LoadingCache<String, List<SshKey>> keyCache = CacheBuilder
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.newBuilder().
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expireAfterAccess(15, TimeUnit.MINUTES).
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maximumSize(100)
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.build(new CacheLoader<String, List<SshKey>>() {
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@Override
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public List<SshKey> load(String username) {
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List<SshKey> keys = getKeysImpl(username);
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if (keys == null) {
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return Collections.emptyList();
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}
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return Collections.unmodifiableList(keys);
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}
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});
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@Override
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public abstract IPublicKeyManager start();
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public abstract boolean isReady();
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@Override
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public abstract IPublicKeyManager stop();
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public final List<SshKey> getKeys(String username) {
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try {
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if (isStale(username)) {
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keyCache.invalidate(username);
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}
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return keyCache.get(username);
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} catch (InvalidCacheLoadException e) {
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if (e.getMessage() == null || !e.getMessage().contains("returned null")) {
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log.error(MessageFormat.format("failed to retrieve keys for {0}", username), e);
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}
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} catch (ExecutionException e) {
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log.error(MessageFormat.format("failed to retrieve keys for {0}", username), e);
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}
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return null;
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}
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public final void renameUser(String oldName, String newName) {
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List<SshKey> keys = getKeys(oldName);
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if (keys == null || keys.isEmpty()) {
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return;
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}
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removeAllKeys(oldName);
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for (SshKey key : keys) {
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addKey(newName, key);
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}
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}
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protected abstract boolean isStale(String username);
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protected abstract List<SshKey> getKeysImpl(String username);
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public abstract boolean addKey(String username, SshKey key);
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public abstract boolean removeKey(String username, SshKey key);
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public abstract boolean removeAllKeys(String username);
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}
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