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/**
* Copyright (C) 2020-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/base/error_codes.h"
#include "mongo/util/stacktrace.h"
#include "mongo/util/str.h"
namespace mongo::variableValidation {
namespace {
Status isValidName(StringData varName,
std::function<bool(char)> prefixPred,
std::function<bool(char)> suffixPred,
int prefixLen) {
if (varName.empty()) {
return Status{ErrorCodes::FailedToParse, "empty variable names are not allowed"};
}
for (int i = 0; i < prefixLen; ++i)
if (!prefixPred(varName[i])) {
return Status{ErrorCodes::FailedToParse,
str::stream()
<< "'" << varName
<< "' starts with an invalid character for a user variable name"};
}
for (size_t i = prefixLen; i < varName.size(); i++)
if (!suffixPred(varName[i])) {
return Status{ErrorCodes::FailedToParse,
str::stream() << "'" << varName << "' contains an invalid character "
<< "for a variable name: '" << varName[i] << "'"};
}
return Status::OK();
}
} // namespace
void validateName(StringData varName,
std::function<bool(char)> prefixPred,
std::function<bool(char)> suffixPred,
int prefixLen) {
uassertStatusOK(isValidName(varName, prefixPred, suffixPred, prefixLen));
}
Status isValidNameForUserWrite(StringData varName) {
// System variables users allowed to write to (currently just one)
if (varName == "CURRENT") {
return Status::OK();
}
return isValidName(varName,
[](char ch) -> bool {
return (ch >= 'a' && ch <= 'z') || (ch & '\x80'); // non-ascii
},
[](char ch) -> bool {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
(ch >= '0' && ch <= '9') || (ch == '_') ||
(ch & '\x80'); // non-ascii
},
1);
}
void validateNameForUserWrite(StringData varName) {
uassertStatusOK(isValidNameForUserWrite(varName));
}
void validateNameForUserRead(StringData varName) {
validateName(varName,
[](char ch) -> bool {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
(ch & '\x80'); // non-ascii
},
[](char ch) -> bool {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
(ch >= '0' && ch <= '9') || (ch == '_') || (ch & '\x80'); // non-ascii
},
1);
}
} // namespace mongo::variableValidation
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