1 /*
2 * Copyright 2014 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License, version 2.0 (the
5 * "License"); you may not use this file except in compliance with the License. You may obtain a
6 * copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software distributed under the License
11 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
12 * or implied. See the License for the specific language governing permissions and limitations under
13 * the License.
14 */
15
16 package io.netty.handler.codec.http2;
17
18 import io.netty.buffer.ByteBuf;
19 import io.netty.util.internal.UnstableApi;
20
21 /**
22 * Encodes {@link Http2Headers} into HPACK-encoded headers blocks.
23 */
24 @UnstableApi
25 public interface Http2HeadersEncoder {
26 /**
27 * Configuration related elements for the {@link Http2HeadersEncoder} interface
28 */
29 interface Configuration {
30 /**
31 * Represents the value for
32 * <a href="https://tools.ietf.org/html/rfc7540#section-6.5.2">SETTINGS_HEADER_TABLE_SIZE</a>.
33 * This method should only be called by Netty (not users) as a result of a receiving a {@code SETTINGS} frame.
34 */
35 void maxHeaderTableSize(long max) throws Http2Exception;
36
37 /**
38 * Represents the value for
39 * <a href="https://tools.ietf.org/html/rfc7540#section-6.5.2">SETTINGS_HEADER_TABLE_SIZE</a>.
40 * The initial value returned by this method must be {@link Http2CodecUtil#DEFAULT_HEADER_TABLE_SIZE}.
41 */
42 long maxHeaderTableSize();
43
44 /**
45 * Represents the value for
46 * <a href="https://tools.ietf.org/html/rfc7540#section-6.5.2">SETTINGS_MAX_HEADER_LIST_SIZE</a>.
47 * This method should only be called by Netty (not users) as a result of a receiving a {@code SETTINGS} frame.
48 */
49 void maxHeaderListSize(long max) throws Http2Exception;
50
51 /**
52 * Represents the value for
53 * <a href="https://tools.ietf.org/html/rfc7540#section-6.5.2">SETTINGS_MAX_HEADER_LIST_SIZE</a>.
54 */
55 long maxHeaderListSize();
56 }
57
58 /**
59 * Determine if a header name/value pair is treated as
60 * <a href="https://tools.ietf.org/html/rfc7541#section-7.1.3">sensitive</a>.
61 * If the object can be dynamically modified and shared across multiple connections it may need to be thread safe.
62 */
63 interface SensitivityDetector {
64 /**
65 * Determine if a header {@code name}/{@code value} pair should be treated as
66 * <a href="https://tools.ietf.org/html/rfc7541#section-7.1.3">sensitive</a>.
67 *
68 * @param name The name for the header.
69 * @param value The value of the header.
70 * @return {@code true} if a header {@code name}/{@code value} pair should be treated as
71 * <a href="https://tools.ietf.org/html/rfc7541#section-7.1.3">sensitive</a>.
72 * {@code false} otherwise.
73 */
74 boolean isSensitive(CharSequence name, CharSequence value);
75 }
76
77 /**
78 * Encodes the given headers and writes the output headers block to the given output buffer.
79 *
80 * @param streamId the identifier of the stream for which the headers are encoded.
81 * @param headers the headers to be encoded.
82 * @param buffer the buffer to receive the encoded headers.
83 */
84 void encodeHeaders(int streamId, Http2Headers headers, ByteBuf buffer) throws Http2Exception;
85
86 /**
87 * Get the {@link Configuration} for this {@link Http2HeadersEncoder}
88 */
89 Configuration configuration();
90
91 /**
92 * Always return {@code false} for {@link SensitivityDetector#isSensitive(CharSequence, CharSequence)}.
93 */
94 SensitivityDetector NEVER_SENSITIVE = new SensitivityDetector() {
95 @Override
96 public boolean isSensitive(CharSequence name, CharSequence value) {
97 return false;
98 }
99 };
100
101 /**
102 * Always return {@code true} for {@link SensitivityDetector#isSensitive(CharSequence, CharSequence)}.
103 */
104 SensitivityDetector ALWAYS_SENSITIVE = new SensitivityDetector() {
105 @Override
106 public boolean isSensitive(CharSequence name, CharSequence value) {
107 return true;
108 }
109 };
110 }
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