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.hc.core5.http.impl;
29
30 import org.apache.hc.core5.annotation.Contract;
31 import org.apache.hc.core5.annotation.ThreadingBehavior;
32 import org.apache.hc.core5.http.ContentLengthStrategy;
33 import org.apache.hc.core5.http.Header;
34 import org.apache.hc.core5.http.HeaderElements;
35 import org.apache.hc.core5.http.HttpException;
36 import org.apache.hc.core5.http.HttpHeaders;
37 import org.apache.hc.core5.http.HttpMessage;
38 import org.apache.hc.core5.http.NotImplementedException;
39 import org.apache.hc.core5.http.ProtocolException;
40 import org.apache.hc.core5.util.Args;
41
42 /**
43 * The default implementation of the content length strategy. This class
44 * will throw {@link ProtocolException} if it encounters an unsupported
45 * transfer encoding, multiple {@code Content-Length} header
46 * values or a malformed {@code Content-Length} header value.
47 * <p>
48 * This class recognizes "chunked" transfer-coding only.
49 *
50 * @since 5.0
51 */
52 @Contract(threading = ThreadingBehavior.IMMUTABLE)
53 public class DefaultContentLengthStrategy implements ContentLengthStrategy {
54
55 public static final DefaultContentLengthStrategyngthStrategy.html#DefaultContentLengthStrategy">DefaultContentLengthStrategy INSTANCE = new DefaultContentLengthStrategy();
56
57 /**
58 * Creates {@code DefaultContentLengthStrategy} instance. {@link ContentLengthStrategy#UNDEFINED}
59 * is used per default when content length is not explicitly specified in the message.
60 */
61 public DefaultContentLengthStrategy() {
62 }
63
64 @Override
65 public long determineLength(final HttpMessage message) throws HttpException {
66 Args.notNull(message, "HTTP message");
67 // Although Transfer-Encoding is specified as a list, in practice
68 // it is either missing or has the single value "chunked". So we
69 // treat it as a single-valued header here.
70 final Header transferEncodingHeader = message.getFirstHeader(HttpHeaders.TRANSFER_ENCODING);
71 if (transferEncodingHeader != null) {
72 final String headerValue = transferEncodingHeader.getValue();
73 if (HeaderElements.CHUNKED_ENCODING.equalsIgnoreCase(headerValue)) {
74 return CHUNKED;
75 }
76 throw new NotImplementedException("Unsupported transfer encoding: " + headerValue);
77 }
78 if (message.countHeaders(HttpHeaders.CONTENT_LENGTH) > 1) {
79 throw new ProtocolException("Multiple Content-Length headers");
80 }
81 final Header contentLengthHeader = message.getFirstHeader(HttpHeaders.CONTENT_LENGTH);
82 if (contentLengthHeader != null) {
83 final String s = contentLengthHeader.getValue();
84 try {
85 final long len = Long.parseLong(s);
86 if (len < 0) {
87 throw new ProtocolException("Negative content length: " + s);
88 }
89 return len;
90 } catch (final NumberFormatException e) {
91 throw new ProtocolException("Invalid content length: " + s);
92 }
93 }
94 return UNDEFINED;
95 }
96
97 }