1 /*
2 * Copyright 2015 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a 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
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty5.handler.codec.http.cookie;
17
18 import java.util.ArrayList;
19 import java.util.Collection;
20 import java.util.Collections;
21 import java.util.List;
22 import java.util.Set;
23 import java.util.TreeSet;
24
25 import static java.util.Objects.requireNonNull;
26
27 /**
28 * A <a href="https://tools.ietf.org/html/rfc6265">RFC6265</a> compliant cookie decoder to be used server side.
29 *
30 * Only name and value fields are expected, so old fields are not populated (path, domain, etc).
31 *
32 * Old <a href="https://tools.ietf.org/html/rfc2965">RFC2965</a> cookies are still supported,
33 * old fields will simply be ignored.
34 *
35 * @see ServerCookieEncoder
36 */
37 public final class ServerCookieDecoder extends CookieDecoder {
38
39 private static final String RFC2965_VERSION = "$Version";
40
41 private static final String RFC2965_PATH = "$" + CookieHeaderNames.PATH;
42
43 private static final String RFC2965_DOMAIN = "$" + CookieHeaderNames.DOMAIN;
44
45 private static final String RFC2965_PORT = "$Port";
46
47 /**
48 * Strict encoder that validates that name and value chars are in the valid scope
49 * defined in RFC6265
50 */
51 public static final ServerCookieDecoder STRICT = new ServerCookieDecoder(true);
52
53 /**
54 * Lax instance that doesn't validate name and value
55 */
56 public static final ServerCookieDecoder LAX = new ServerCookieDecoder(false);
57
58 private ServerCookieDecoder(boolean strict) {
59 super(strict);
60 }
61
62 /**
63 * Decodes the specified {@code Cookie} HTTP header value into a {@link Cookie}. Unlike {@link #decode(String)},
64 * this includes all cookie values present, even if they have the same name.
65 *
66 * @return the decoded {@link Cookie}
67 */
68 public List<Cookie> decodeAll(String header) {
69 List<Cookie> cookies = new ArrayList<>();
70 decode(cookies, header);
71 return Collections.unmodifiableList(cookies);
72 }
73
74 /**
75 * Decodes the specified {@code Cookie} HTTP header value into a {@link Cookie}.
76 *
77 * @return the decoded {@link Cookie}
78 */
79 public Set<Cookie> decode(String header) {
80 Set<Cookie> cookies = new TreeSet<>();
81 decode(cookies, header);
82 return cookies;
83 }
84
85 /**
86 * Decodes the specified {@code Cookie} HTTP header value into a {@link Cookie}.
87 */
88 private void decode(Collection<? super Cookie> cookies, String header) {
89 final int headerLen = requireNonNull(header, "header").length();
90
91 if (headerLen == 0) {
92 return;
93 }
94
95 int i = 0;
96
97 boolean rfc2965Style = false;
98 if (header.regionMatches(true, 0, RFC2965_VERSION, 0, RFC2965_VERSION.length())) {
99 // RFC 2965 style cookie, move to after version value
100 i = header.indexOf(';') + 1;
101 rfc2965Style = true;
102 }
103
104 loop: for (;;) {
105
106 // Skip spaces and separators.
107 for (;;) {
108 if (i == headerLen) {
109 break loop;
110 }
111 char c = header.charAt(i);
112 if (c == '\t' || c == '\n' || c == 0x0b || c == '\f'
113 || c == '\r' || c == ' ' || c == ',' || c == ';') {
114 i++;
115 continue;
116 }
117 break;
118 }
119
120 int nameBegin = i;
121 int nameEnd;
122 int valueBegin;
123 int valueEnd;
124
125 for (;;) {
126
127 char curChar = header.charAt(i);
128 if (curChar == ';') {
129 // NAME; (no value till ';')
130 nameEnd = i;
131 valueBegin = valueEnd = -1;
132 break;
133
134 } else if (curChar == '=') {
135 // NAME=VALUE
136 nameEnd = i;
137 i++;
138 if (i == headerLen) {
139 // NAME= (empty value, i.e. nothing after '=')
140 valueBegin = valueEnd = 0;
141 break;
142 }
143
144 valueBegin = i;
145 // NAME=VALUE;
146 int semiPos = header.indexOf(';', i);
147 valueEnd = i = semiPos > 0 ? semiPos : headerLen;
148 break;
149 } else {
150 i++;
151 }
152
153 if (i == headerLen) {
154 // NAME (no value till the end of string)
155 nameEnd = headerLen;
156 valueBegin = valueEnd = -1;
157 break;
158 }
159 }
160
161 if (rfc2965Style && (header.regionMatches(nameBegin, RFC2965_PATH, 0, RFC2965_PATH.length()) ||
162 header.regionMatches(nameBegin, RFC2965_DOMAIN, 0, RFC2965_DOMAIN.length()) ||
163 header.regionMatches(nameBegin, RFC2965_PORT, 0, RFC2965_PORT.length()))) {
164
165 // skip obsolete RFC2965 fields
166 continue;
167 }
168
169 DefaultCookie cookie = initCookie(header, nameBegin, nameEnd, valueBegin, valueEnd);
170 if (cookie != null) {
171 cookies.add(cookie);
172 }
173 }
174 }
175 }