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 import org.apache.http.util.Args;
39
40 /**
41 * The strict implementation of the content length strategy. This class
42 * will throw {@link ProtocolException} if it encounters an unsupported
43 * transfer encoding or a malformed <code>Content-Length</code> header
44 * value.
45 * <p>
46 * This class recognizes "chunked" and "identitiy" transfer-coding only.
47 *
48 * @since 4.0
49 */
50 @Immutable
51 public class StrictContentLengthStrategy implements ContentLengthStrategy {
52
53 public static final StrictContentLengthStrategy INSTANCE = new StrictContentLengthStrategy();
54
55 private final int implicitLen;
56
57 /**
58 * Creates <tt>StrictContentLengthStrategy</tt> instance with the given length used per default
59 * when content length is not explicitly specified in the message.
60 *
61 * @param implicitLen implicit content length.
62 *
63 * @since 4.2
64 */
65 public StrictContentLengthStrategy(final int implicitLen) {
66 super();
67 this.implicitLen = implicitLen;
68 }
69
70 /**
71 * Creates <tt>StrictContentLengthStrategy</tt> instance. {@link ContentLengthStrategy#IDENTITY}
72 * is used per default when content length is not explicitly specified in the message.
73 */
74 public StrictContentLengthStrategy() {
75 this(IDENTITY);
76 }
77
78 public long determineLength(final HttpMessage message) throws HttpException {
79 Args.notNull(message, "HTTP message");
80 // Although Transfer-Encoding is specified as a list, in practice
81 // it is either missing or has the single value "chunked". So we
82 // treat it as a single-valued header here.
83 final Header transferEncodingHeader = message.getFirstHeader(HTTP.TRANSFER_ENCODING);
84 if (transferEncodingHeader != null) {
85 final String s = transferEncodingHeader.getValue();
86 if (HTTP.CHUNK_CODING.equalsIgnoreCase(s)) {
87 if (message.getProtocolVersion().lessEquals(HttpVersion.HTTP_1_0)) {
88 throw new ProtocolException(
89 "Chunked transfer encoding not allowed for " +
90 message.getProtocolVersion());
91 }
92 return CHUNKED;
93 } else if (HTTP.IDENTITY_CODING.equalsIgnoreCase(s)) {
94 return IDENTITY;
95 } else {
96 throw new ProtocolException(
97 "Unsupported transfer encoding: " + s);
98 }
99 }
100 final Header contentLengthHeader = message.getFirstHeader(HTTP.CONTENT_LEN);
101 if (contentLengthHeader != null) {
102 final String s = contentLengthHeader.getValue();
103 try {
104 final long len = Long.parseLong(s);
105 if (len < 0) {
106 throw new ProtocolException("Negative content length: " + s);
107 }
108 return len;
109 } catch (final NumberFormatException e) {
110 throw new ProtocolException("Invalid content length: " + s);
111 }
112 }
113 return this.implicitLen;
114 }
115
116 }