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comparison: mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/entity/LaxContentLengthStrategy.java

mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/entity/LaxContentLengthStrategy.java

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1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27
28 package ch.boye.httpclientandroidlib.impl.entity;
29
30 import ch.boye.httpclientandroidlib.Header;
31 import ch.boye.httpclientandroidlib.HeaderElement;
32 import ch.boye.httpclientandroidlib.HttpException;
33 import ch.boye.httpclientandroidlib.HttpMessage;
34 import ch.boye.httpclientandroidlib.ParseException;
35 import ch.boye.httpclientandroidlib.ProtocolException;
36 import ch.boye.httpclientandroidlib.entity.ContentLengthStrategy;
37 import ch.boye.httpclientandroidlib.params.HttpParams;
38 import ch.boye.httpclientandroidlib.params.CoreProtocolPNames;
39 import ch.boye.httpclientandroidlib.protocol.HTTP;
40
41 /**
42 * The lax implementation of the content length strategy. This class will ignore
43 * unrecognized transfer encodings and malformed <code>Content-Length</code>
44 * header values if the {@link CoreProtocolPNames#STRICT_TRANSFER_ENCODING}
45 * parameter of the given message is not set or set to <code>false</code>.
46 * <p>
47 * This class recognizes "chunked" and "identitiy" transfer-coding only.
48 * <p>
49 * The following parameters can be used to customize the behavior of this class:
50 * <ul>
51 * <li>{@link ch.boye.httpclientandroidlib.params.CoreProtocolPNames#STRICT_TRANSFER_ENCODING}</li>
52 * </ul>
53 *
54 * @since 4.0
55 */
56 public class LaxContentLengthStrategy implements ContentLengthStrategy {
57
58 public LaxContentLengthStrategy() {
59 super();
60 }
61
62 public long determineLength(final HttpMessage message) throws HttpException {
63 if (message == null) {
64 throw new IllegalArgumentException("HTTP message may not be null");
65 }
66
67 HttpParams params = message.getParams();
68 boolean strict = params.isParameterTrue(CoreProtocolPNames.STRICT_TRANSFER_ENCODING);
69
70 Header transferEncodingHeader = message.getFirstHeader(HTTP.TRANSFER_ENCODING);
71 Header contentLengthHeader = message.getFirstHeader(HTTP.CONTENT_LEN);
72 // We use Transfer-Encoding if present and ignore Content-Length.
73 // RFC2616, 4.4 item number 3
74 if (transferEncodingHeader != null) {
75 HeaderElement[] encodings = null;
76 try {
77 encodings = transferEncodingHeader.getElements();
78 } catch (ParseException px) {
79 throw new ProtocolException
80 ("Invalid Transfer-Encoding header value: " +
81 transferEncodingHeader, px);
82 }
83 if (strict) {
84 // Currently only chunk and identity are supported
85 for (int i = 0; i < encodings.length; i++) {
86 String encoding = encodings[i].getName();
87 if (encoding != null && encoding.length() > 0
88 && !encoding.equalsIgnoreCase(HTTP.CHUNK_CODING)
89 && !encoding.equalsIgnoreCase(HTTP.IDENTITY_CODING)) {
90 throw new ProtocolException("Unsupported transfer encoding: " + encoding);
91 }
92 }
93 }
94 // The chunked encoding must be the last one applied RFC2616, 14.41
95 int len = encodings.length;
96 if (HTTP.IDENTITY_CODING.equalsIgnoreCase(transferEncodingHeader.getValue())) {
97 return IDENTITY;
98 } else if ((len > 0) && (HTTP.CHUNK_CODING.equalsIgnoreCase(
99 encodings[len - 1].getName()))) {
100 return CHUNKED;
101 } else {
102 if (strict) {
103 throw new ProtocolException("Chunk-encoding must be the last one applied");
104 }
105 return IDENTITY;
106 }
107 } else if (contentLengthHeader != null) {
108 long contentlen = -1;
109 Header[] headers = message.getHeaders(HTTP.CONTENT_LEN);
110 if (strict && headers.length > 1) {
111 throw new ProtocolException("Multiple content length headers");
112 }
113 for (int i = headers.length - 1; i >= 0; i--) {
114 Header header = headers[i];
115 try {
116 contentlen = Long.parseLong(header.getValue());
117 break;
118 } catch (NumberFormatException e) {
119 if (strict) {
120 throw new ProtocolException("Invalid content length: " + header.getValue());
121 }
122 }
123 // See if we can have better luck with another header, if present
124 }
125 if (contentlen >= 0) {
126 return contentlen;
127 } else {
128 return IDENTITY;
129 }
130 } else {
131 return IDENTITY;
132 }
133 }
134
135 }

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