1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/quic/core/spdy_utils.h"
#include <memory>
#include <vector>
#include "net/quic/platform/api/quic_flag_utils.h"
#include "net/quic/platform/api/quic_flags.h"
#include "net/quic/platform/api/quic_logging.h"
#include "net/quic/platform/api/quic_map_util.h"
#include "net/quic/platform/api/quic_string_piece.h"
#include "net/quic/platform/api/quic_text_utils.h"
#include "net/quic/platform/api/quic_url_utils.h"
#include "net/spdy/chromium/spdy_flags.h"
#include "net/spdy/core/spdy_frame_builder.h"
#include "net/spdy/core/spdy_framer.h"
#include "net/spdy/core/spdy_protocol.h"
using std::string;
namespace net {
// static
string SpdyUtils::SerializeUncompressedHeaders(const SpdyHeaderBlock& headers) {
size_t length = SpdyFramer::GetUncompressedSerializedLength(headers);
SpdyFrameBuilder builder(length);
SpdyFramer framer(SpdyFramer::DISABLE_COMPRESSION);
framer.SerializeHeaderBlockWithoutCompression(&builder, headers);
SpdySerializedFrame block(builder.take());
return string(block.data(), length);
}
// static
bool SpdyUtils::ExtractContentLengthFromHeaders(int64_t* content_length,
SpdyHeaderBlock* headers) {
auto it = headers->find("content-length");
if (it == headers->end()) {
return false;
} else {
// Check whether multiple values are consistent.
QuicStringPiece content_length_header = it->second;
std::vector<QuicStringPiece> values =
QuicTextUtils::Split(content_length_header, '\0');
for (const QuicStringPiece& value : values) {
uint64_t new_value;
if (!QuicTextUtils::StringToUint64(value, &new_value)) {
QUIC_DLOG(ERROR)
<< "Content length was either unparseable or negative.";
return false;
}
if (*content_length < 0) {
*content_length = new_value;
continue;
}
if (new_value != static_cast<uint64_t>(*content_length)) {
QUIC_DLOG(ERROR)
<< "Parsed content length " << new_value << " is "
<< "inconsistent with previously detected content length "
<< *content_length;
return false;
}
}
return true;
}
}
bool SpdyUtils::CopyAndValidateHeaders(const QuicHeaderList& header_list,
int64_t* content_length,
SpdyHeaderBlock* headers) {
for (const auto& p : header_list) {
const string& name = p.first;
if (name.empty()) {
QUIC_DLOG(ERROR) << "Header name must not be empty.";
return false;
}
if (QuicTextUtils::ContainsUpperCase(name)) {
QUIC_DLOG(ERROR) << "Malformed header: Header name " << name
<< " contains upper-case characters.";
return false;
}
headers->AppendValueOrAddHeader(name, p.second);
}
if (QuicContainsKey(*headers, "content-length") &&
!ExtractContentLengthFromHeaders(content_length, headers)) {
return false;
}
QUIC_DVLOG(1) << "Successfully parsed headers: " << headers->DebugString();
return true;
}
bool SpdyUtils::CopyAndValidateTrailers(const QuicHeaderList& header_list,
size_t* final_byte_offset,
SpdyHeaderBlock* trailers) {
const bool handle_duplicate_trailers =
FLAGS_quic_reloadable_flag_quic_handle_duplicate_trailers;
bool found_final_byte_offset = false;
for (const auto& p : header_list) {
const string& name = p.first;
// Pull out the final offset pseudo header which indicates the number of
// response body bytes expected.
if (!found_final_byte_offset && name == kFinalOffsetHeaderKey &&
QuicTextUtils::StringToSizeT(p.second, final_byte_offset)) {
found_final_byte_offset = true;
continue;
}
if (name.empty() || name[0] == ':') {
QUIC_DLOG(ERROR)
<< "Trailers must not be empty, and must not contain pseudo-"
<< "headers. Found: '" << name << "'";
return false;
}
if (QuicTextUtils::ContainsUpperCase(name)) {
QUIC_DLOG(ERROR) << "Malformed header: Header name " << name
<< " contains upper-case characters.";
return false;
}
if (handle_duplicate_trailers) {
QUIC_FLAG_COUNT_N(quic_reloadable_flag_quic_handle_duplicate_trailers, 1,
3);
trailers->AppendValueOrAddHeader(name, p.second);
} else {
QUIC_FLAG_COUNT_N(quic_reloadable_flag_quic_handle_duplicate_trailers, 2,
3);
if (trailers->find(name) != trailers->end()) {
QUIC_FLAG_COUNT_N(quic_reloadable_flag_quic_handle_duplicate_trailers,
3, 3);
QUIC_DLOG(ERROR) << "Duplicate header '" << name
<< "' found in trailers.";
return false;
}
(*trailers)[name] = p.second;
}
}
if (!found_final_byte_offset) {
QUIC_DLOG(ERROR) << "Required key '" << kFinalOffsetHeaderKey
<< "' not present";
return false;
}
// TODO(rjshade): Check for other forbidden keys, following the HTTP/2 spec.
QUIC_DVLOG(1) << "Successfully parsed Trailers: " << trailers->DebugString();
return true;
}
// static
string SpdyUtils::GetUrlFromHeaderBlock(const SpdyHeaderBlock& headers) {
SpdyHeaderBlock::const_iterator it = headers.find(":scheme");
if (it == headers.end()) {
return "";
}
std::string url = it->second.as_string();
url.append("://");
it = headers.find(":authority");
if (it == headers.end()) {
return "";
}
url.append(it->second.as_string());
it = headers.find(":path");
if (it == headers.end()) {
return "";
}
url.append(it->second.as_string());
return url;
}
// static
string SpdyUtils::GetHostNameFromHeaderBlock(const SpdyHeaderBlock& headers) {
// TODO(fayang): Consider just checking out the value of the ":authority" key
// in headers.
return QuicUrlUtils::HostName(GetUrlFromHeaderBlock(headers));
}
// static
bool SpdyUtils::UrlIsValid(const SpdyHeaderBlock& headers) {
string url(GetUrlFromHeaderBlock(headers));
return url != "" && QuicUrlUtils::IsValidUrl(url);
}
// static
bool SpdyUtils::PopulateHeaderBlockFromUrl(const string url,
SpdyHeaderBlock* headers) {
(*headers)[":method"] = "GET";
size_t pos = url.find("://");
if (pos == string::npos) {
return false;
}
(*headers)[":scheme"] = url.substr(0, pos);
size_t start = pos + 3;
pos = url.find("/", start);
if (pos == string::npos) {
(*headers)[":authority"] = url.substr(start);
(*headers)[":path"] = "/";
return true;
}
(*headers)[":authority"] = url.substr(start, pos - start);
(*headers)[":path"] = url.substr(pos);
return true;
}
} // namespace net
|
