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
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include <regex>
#include "mongo/util/uuid.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/platform/random.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/hex.h"
namespace mongo {
namespace {
stdx::mutex uuidGenMutex;
auto uuidGen = SecureRandom::create();
// Regex to match valid version 4 UUIDs with variant bits set
std::regex uuidRegex("[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}",
std::regex::optimize);
} // namespace
StatusWith<UUID> UUID::parse(BSONElement from) {
try {
return UUID{from.uuid()};
} catch (const AssertionException& e) {
return e.toStatus();
}
}
StatusWith<UUID> UUID::parse(const std::string& s) {
if (!isUUIDString(s)) {
return {ErrorCodes::InvalidUUID, "Invalid UUID string: " + s};
}
UUIDStorage uuid;
// 4 Octets - 2 Octets - 2 Octets - 2 Octets - 6 Octets
int j = 0;
for (int i = 0; i < UUID::kNumBytes; i++) {
// Skip hyphens
if (s[j] == '-')
j++;
char high = s[j++];
char low = s[j++];
uuid[i] = ((uassertStatusOK(fromHex(high)) << 4) | uassertStatusOK(fromHex(low)));
}
return UUID{std::move(uuid)};
}
UUID UUID::parse(const BSONObj& obj) {
auto res = parse(obj.getField("uuid"));
uassert(40566, res.getStatus().reason(), res.isOK());
return res.getValue();
}
bool UUID::isUUIDString(const std::string& s) {
return std::regex_match(s, uuidRegex);
}
bool UUID::isRFC4122v4() const {
return (_uuid[6] & ~0x0f) == 0x40 && (_uuid[8] & ~0x3f) == 0x80; // See RFC 4122, section 4.4.
}
UUID UUID::gen() {
int64_t randomWords[2];
{
stdx::lock_guard<stdx::mutex> lk(uuidGenMutex);
// Generate 128 random bits
randomWords[0] = uuidGen->nextInt64();
randomWords[1] = uuidGen->nextInt64();
}
UUIDStorage randomBytes;
memcpy(&randomBytes, randomWords, sizeof(randomBytes));
// Set version in high 4 bits of byte 6 and variant in high 2 bits of byte 8, see RFC 4122,
// section 4.1.1, 4.1.2 and 4.1.3.
randomBytes[6] &= 0x0f;
randomBytes[6] |= 0x40; // v4
randomBytes[8] &= 0x3f;
randomBytes[8] |= 0x80; // Randomly assigned
return UUID{randomBytes};
}
void UUID::appendToBuilder(BSONObjBuilder* builder, StringData name) const {
builder->appendBinData(name, sizeof(UUIDStorage), BinDataType::newUUID, &_uuid);
}
void UUID::appendToArrayBuilder(BSONArrayBuilder* builder) const {
builder->appendBinData(sizeof(UUIDStorage), BinDataType::newUUID, &_uuid);
}
BSONObj UUID::toBSON() const {
BSONObjBuilder builder;
appendToBuilder(&builder, "uuid");
return builder.obj();
}
std::string UUID::toString() const {
StringBuilder ss;
// 4 Octets - 2 Octets - 2 Octets - 2 Octets - 6 Octets
ss << toHexLower(&_uuid[0], 4);
ss << "-";
ss << toHexLower(&_uuid[4], 2);
ss << "-";
ss << toHexLower(&_uuid[6], 2);
ss << "-";
ss << toHexLower(&_uuid[8], 2);
ss << "-";
ss << toHexLower(&_uuid[10], 6);
return ss.str();
}
template <>
BSONObjBuilder& BSONObjBuilderValueStream::operator<<<UUID>(UUID value) {
value.appendToBuilder(_builder, _fieldName);
_fieldName = StringData();
return *_builder;
}
} // namespace mongo
|
