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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
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 * or more contributor license agreements.  See the NOTICE file
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 * distributed with this work for additional information
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 * regarding copyright ownership.  The ASF licenses this file
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 * to you under the Apache License, Version 2.0 (the
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 * "License"); you may not use this file except in compliance
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 * with the License.  You may obtain a copy of 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,
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 * software distributed under the License is distributed on an
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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 * KIND, either express or implied.  See the License for the
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 * specific language governing permissions and limitations
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 * under the License.
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 */
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package org.apache.sshd.server.auth;
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import java.security.PublicKey;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import org.apache.sshd.common.Session;
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import org.apache.sshd.common.SessionListener;
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import org.apache.sshd.server.PublickeyAuthenticator;
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import org.apache.sshd.server.session.ServerSession;
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/**
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 * TODO Add javadoc
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 *
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 * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
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 */
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public class CachingPublicKeyAuthenticator implements PublickeyAuthenticator, SessionListener {
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    protected final PublickeyAuthenticator authenticator;
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    protected final Map<ServerSession, Map<PublicKey, Boolean>> cache = new ConcurrentHashMap<ServerSession, Map<PublicKey, Boolean>>();
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    public CachingPublicKeyAuthenticator(PublickeyAuthenticator authenticator) {
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        this.authenticator = authenticator;
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    }
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    public boolean authenticate(String username, PublicKey key, ServerSession session) {
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        Map<PublicKey, Boolean> map = cache.get(session);
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        if (map == null) {
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            map = new HashMap<PublicKey, Boolean>();
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            cache.put(session, map);
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            session.addListener(this);
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        }
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        if (map.containsKey(key)) {
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            return map.get(key);
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        }
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        boolean result = authenticator.authenticate(username, key, session);
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        map.put(key, result);
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        return result;
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    }
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    public void sessionCreated(Session session) {
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    }
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    public void sessionEvent(Session session, Event event) {
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    }
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    public void sessionClosed(Session session) {
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        cache.remove(session);
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    }
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}