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 org.apache.http.impl.entity;
29
30 import org.apache.http.Header;
31 import org.apache.http.HttpException;
32 import org.apache.http.HttpMessage;
33 import org.apache.http.HttpVersion;
34 import org.apache.http.ProtocolException;
35 import org.apache.http.annotation.Immutable;
36 import org.apache.http.entity.ContentLengthStrategy;
37 import org.apache.http.protocol.HTTP;
38
39 /**
40 * The strict implementation of the content length strategy. This class
41 * will throw {@link ProtocolException} if it encounters an unsupported
42 * transfer encoding or a malformed <code>Content-Length</code> header
43 * value.
44 * <p>
45 * This class recognizes "chunked" and "identitiy" transfer-coding only.
46 *
47 * @since 4.0
48 */
49 @Immutable
50 public class StrictContentLengthStrategy implements ContentLengthStrategy {
51
52 private final int implicitLen;
53
54 /**
55 * Creates <tt>StrictContentLengthStrategy</tt> instance with the given length used per default
56 * when content length is not explicitly specified in the message.
57 *
58 * @param implicitLen implicit content length.
59 *
60 * @since 4.2
61 */
62 public StrictContentLengthStrategy(int implicitLen) {
63 super();
64 this.implicitLen = implicitLen;
65 }
66
67 /**
68 * Creates <tt>StrictContentLengthStrategy</tt> instance. {@link ContentLengthStrategy#IDENTITY}
69 * is used per default when content length is not explicitly specified in the message.
70 */
71 public StrictContentLengthStrategy() {
72 this(IDENTITY);
73 }
74
75 public long determineLength(final HttpMessage message) throws HttpException {
76 if (message == null) {
77 throw new IllegalArgumentException("HTTP message may not be null");
78 }
79 // Although Transfer-Encoding is specified as a list, in practice
80 // it is either missing or has the single value "chunked". So we
81 // treat it as a single-valued header here.
82 Header transferEncodingHeader = message.getFirstHeader(HTTP.TRANSFER_ENCODING);
83 if (transferEncodingHeader != null) {
84 String s = transferEncodingHeader.getValue();
85 if (HTTP.CHUNK_CODING.equalsIgnoreCase(s)) {
86 if (message.getProtocolVersion().lessEquals(HttpVersion.HTTP_1_0)) {
87 throw new ProtocolException(
88 "Chunked transfer encoding not allowed for " +
89 message.getProtocolVersion());
90 }
91 return CHUNKED;
92 } else if (HTTP.IDENTITY_CODING.equalsIgnoreCase(s)) {
93 return IDENTITY;
94 } else {
95 throw new ProtocolException(
96 "Unsupported transfer encoding: " + s);
97 }
98 }
99 Header contentLengthHeader = message.getFirstHeader(HTTP.CONTENT_LEN);
100 if (contentLengthHeader != null) {
101 String s = contentLengthHeader.getValue();
102 try {
103 long len = Long.parseLong(s);
104 if (len < 0) {
105 throw new ProtocolException("Negative content length: " + s);
106 }
107 return len;
108 } catch (NumberFormatException e) {
109 throw new ProtocolException("Invalid content length: " + s);
110 }
111 }
112 return this.implicitLen;
113 }
114
115 }