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 javax.mail.internet;
21
22 import java.io.IOException;
23 import java.io.InputStream;
24 import java.io.OutputStream;
25 import java.net.UnknownServiceException;
26 import javax.activation.DataSource;
27 import javax.mail.MessageAware;
28 import javax.mail.MessageContext;
29 import javax.mail.MessagingException;
30
31 /**
32 * @version $Rev: 689126 $ $Date: 2008-08-26 12:17:53 -0400 (Tue, 26 Aug 2008) $
33 */
34 public class MimePartDataSource implements DataSource, MessageAware {
35 // the part that provides the data form this data source.
36 protected MimePart part;
37
38 public MimePartDataSource(MimePart part) {
39 this.part = part;
40 }
41
42 public InputStream getInputStream() throws IOException {
43 try {
44 InputStream stream;
45 if (part instanceof MimeMessage) {
46 // this never gets encoded, so we can skip other steps
47 return ((MimeMessage) part).getContentStream();
48 } else if (part instanceof MimeBodyPart) {
49 stream = ((MimeBodyPart) part).getContentStream();
50 } else {
51 throw new MessagingException("Unknown part");
52 }
53 return checkPartEncoding(part, stream);
54 } catch (MessagingException e) {
55 throw (IOException) new IOException(e.getMessage()).initCause(e);
56 }
57 }
58
59
60 /**
61 * For a given part, decide it the data stream requires
62 * wrappering with a stream for decoding a particular
63 * encoding.
64 *
65 * @param part The part we're extracting.
66 * @param stream The raw input stream for the part.
67 *
68 * @return An input stream configured for reading the
69 * source part and decoding it into raw bytes.
70 */
71 private InputStream checkPartEncoding(MimePart part, InputStream stream) throws MessagingException {
72 String encoding = part.getEncoding();
73 // if nothing is specified, there's nothing to do
74 if (encoding == null) {
75 return stream;
76 }
77 // now screen out the ones that never need decoding
78 encoding = encoding.toLowerCase();
79 if (encoding.equals("7bit") || encoding.equals("8bit") || encoding.equals("binary")) {
80 return stream;
81 }
82 // now we need to check the content type to prevent
83 // MultiPart types from getting decoded, since the part is just an envelope around other
84 // parts
85 String contentType = part.getContentType();
86 if (contentType != null) {
87 try {
88 ContentType type = new ContentType(contentType);
89 // no decoding done here
90 if (type.match("multipart/*")) {
91 return stream;
92 }
93 } catch (ParseException e) {
94 // ignored....bad content type means we handle as a normal part
95 }
96 }
97 // ok, wrap this is a decoding stream if required
98 return MimeUtility.decode(stream, encoding);
99 }
100
101
102 public OutputStream getOutputStream() throws IOException {
103 throw new UnknownServiceException();
104 }
105
106 public String getContentType() {
107 try {
108 return part.getContentType();
109 } catch (MessagingException e) {
110 return null;
111 }
112 }
113
114 public String getName() {
115 return "";
116 }
117
118 public synchronized MessageContext getMessageContext() {
119 return new MessageContext(part);
120 }
121 }