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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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 UserException& e) {
return exceptionToStatus();
}
}
StatusWith<UUID> UUID::parse(const std::string& s) {
if (!isUUIDString(s)) {
return {ErrorCodes::InvalidUUID, "Invalid uuid string"};
}
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] = ((fromHex(high) << 4) | fromHex(low));
}
return UUID{std::move(uuid)};
}
bool UUID::isUUIDString(const std::string& s) {
return std::regex_match(s, uuidRegex);
}
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);
}
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();
}
} // namespace mongo
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