/****************************************************************
 * 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.james.protocols.impl;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;

import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.group.ChannelGroup;
import org.jboss.netty.handler.ssl.SslHandler;

/**
 * Abstract base class for {@link ChannelPipeline} implementations which use TLS 
 * 
 *
 */
public abstract class AbstractSSLAwareChannelPipelineFactory extends AbstractChannelPipelineFactory{

    
    private String[] enabledCipherSuites = null;

    public AbstractSSLAwareChannelPipelineFactory(int timeout,
            int maxConnections, int maxConnectsPerIp, ChannelGroup group) {
        super(timeout, maxConnections, maxConnectsPerIp, group);
    }

    public AbstractSSLAwareChannelPipelineFactory(int timeout,
            int maxConnections, int maxConnectsPerIp, ChannelGroup group, String[] enabledCipherSuites) {
        this(timeout, maxConnections, maxConnectsPerIp, group);
        
        // We need to copy the String array becuase of possible security issues.
        // See https://issues.apache.org/jira/browse/PROTOCOLS-18
        this.enabledCipherSuites = new String[enabledCipherSuites.length];
        for (int i = 0; i < enabledCipherSuites.length; i++) {
            this.enabledCipherSuites[i] = new String(enabledCipherSuites[i]);
        }
    }

    
    @Override
    public ChannelPipeline getPipeline() throws Exception {
        ChannelPipeline pipeline =  super.getPipeline();

        if (isSSLSocket()) {
            // We need to set clientMode to false.
            // See https://issues.apache.org/jira/browse/JAMES-1025
            SSLEngine engine = getSSLContext().createSSLEngine();
            engine.setUseClientMode(false);
            if (enabledCipherSuites != null && enabledCipherSuites.length > 0) {
                engine.setEnabledCipherSuites(enabledCipherSuites);
            }
            pipeline.addFirst("sslHandler", new SslHandler(engine));
        }
        return pipeline;
    }

    /**
     * Return if the socket is using SSL/TLS
     * 
     * @return isSSL
     */
    protected abstract boolean isSSLSocket();
    
    /**
     * Return the SSL context
     * 
     * @return context
     */
    protected abstract SSLContext getSSLContext();
}

@@ -2291,16 +2291,63 @@
 COLS-18%0A
+        if (enabledCipherSuites != null) %7B%0A    
         
@@ -2421,16 +2421,20 @@
         
+    
 for (int
@@ -2484,32 +2484,36 @@
 ) %7B%0A            
+ 
+   
 this.enabledCiph
@@ -2562,16 +2562,30 @@
 es%5Bi%5D);%0A
+            %7D%0A
         

Check for null value to prevent NPE