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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.mina.http;
21  
22  import java.nio.ByteBuffer;
23  import java.nio.charset.CharsetEncoder;
24  import java.nio.charset.StandardCharsets;
25  import java.util.Map;
26  
27  import org.apache.mina.core.buffer.IoBuffer;
28  import org.apache.mina.core.session.IoSession;
29  import org.apache.mina.filter.codec.ProtocolEncoder;
30  import org.apache.mina.filter.codec.ProtocolEncoderOutput;
31  import org.apache.mina.http.api.HttpEndOfContent;
32  import org.apache.mina.http.api.HttpResponse;
33  import org.slf4j.Logger;
34  import org.slf4j.LoggerFactory;
35  
36  /**
37   * An encoder for the HTTP server
38   * 
39   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
40   */
41  public class HttpServerEncoder implements ProtocolEncoder {
42      private static final Logger LOG = LoggerFactory.getLogger(HttpServerCodec.class);
43      private static final CharsetEncoder ENCODER = StandardCharsets.UTF_8.newEncoder();
44  
45      /**
46       * {@inheritDoc}
47       */
48      @Override
49      public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception {
50          LOG.debug("encode {}", message.getClass().getCanonicalName());
51      
52          if (message instanceof HttpResponse) {
53              LOG.debug("HttpResponse");
54              HttpResponse msg = (HttpResponse) message;
55              StringBuilder sb = new StringBuilder(msg.getStatus().line());
56  
57              for (Map.Entry<String, String> header : msg.getHeaders().entrySet()) {
58                  sb.append(header.getKey());
59                  sb.append(": ");
60                  sb.append(header.getValue());
61                  sb.append("\r\n");
62              }
63              
64              sb.append("\r\n");
65              IoBuffer buf = IoBuffer.allocate(sb.length()).setAutoExpand(true);
66              buf.putString(sb.toString(), ENCODER);
67              buf.flip();
68              out.write(buf);
69          } else if (message instanceof ByteBuffer) {
70              LOG.debug("Body {}", message);
71              out.write(message);
72          } else if (message instanceof HttpEndOfContent) {
73              LOG.debug("End of Content");
74              // end of HTTP content
75              // keep alive ?
76          }
77      }
78  
79      /**
80       * {@inheritDoc}
81       */
82      @Override
83      public void dispose(IoSession session) throws Exception {
84          // TODO Auto-generated method stub
85      }
86  }