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/**
* 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 "mongo/db/pipeline/variables.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
constexpr Variables::Id Variables::kRootId;
constexpr Variables::Id Variables::kRemoveId;
const StringMap<Variables::Id> Variables::kBuiltinVarNameToId = {{"ROOT", kRootId},
{"REMOVE", kRemoveId}};
void Variables::uassertValidNameForUserWrite(StringData varName) {
// System variables users allowed to write to (currently just one)
if (varName == "CURRENT") {
return;
}
uassert(16866, "empty variable names are not allowed", !varName.empty());
const bool firstCharIsValid =
(varName[0] >= 'a' && varName[0] <= 'z') || (varName[0] & '\x80') // non-ascii
;
uassert(16867,
str::stream() << "'" << varName
<< "' starts with an invalid character for a user variable name",
firstCharIsValid);
for (size_t i = 1; i < varName.size(); i++) {
const bool charIsValid = (varName[i] >= 'a' && varName[i] <= 'z') ||
(varName[i] >= 'A' && varName[i] <= 'Z') || (varName[i] >= '0' && varName[i] <= '9') ||
(varName[i] == '_') || (varName[i] & '\x80') // non-ascii
;
uassert(16868,
str::stream() << "'" << varName << "' contains an invalid character "
<< "for a variable name: '"
<< varName[i]
<< "'",
charIsValid);
}
}
void Variables::uassertValidNameForUserRead(StringData varName) {
uassert(16869, "empty variable names are not allowed", !varName.empty());
const bool firstCharIsValid = (varName[0] >= 'a' && varName[0] <= 'z') ||
(varName[0] >= 'A' && varName[0] <= 'Z') || (varName[0] & '\x80') // non-ascii
;
uassert(16870,
str::stream() << "'" << varName
<< "' starts with an invalid character for a variable name",
firstCharIsValid);
for (size_t i = 1; i < varName.size(); i++) {
const bool charIsValid = (varName[i] >= 'a' && varName[i] <= 'z') ||
(varName[i] >= 'A' && varName[i] <= 'Z') || (varName[i] >= '0' && varName[i] <= '9') ||
(varName[i] == '_') || (varName[i] & '\x80') // non-ascii
;
uassert(16871,
str::stream() << "'" << varName << "' contains an invalid character "
<< "for a variable name: '"
<< varName[i]
<< "'",
charIsValid);
}
}
void Variables::setValue(Id id, const Value& value, bool isConstant) {
uassert(17199, "can't use Variables::setValue to set a reserved builtin variable", id >= 0);
const auto idAsSizeT = static_cast<size_t>(id);
if (idAsSizeT >= _valueList.size()) {
_valueList.resize(idAsSizeT + 1);
} else {
// If a value has already been set for 'id', and that value was marked as constant, then it
// is illegal to modify.
invariant(!_valueList[idAsSizeT].isConstant);
}
_valueList[idAsSizeT] = ValueAndState(value, isConstant);
}
void Variables::setValue(Variables::Id id, const Value& value) {
const bool isConstant = false;
setValue(id, value, isConstant);
}
void Variables::setConstantValue(Variables::Id id, const Value& value) {
const bool isConstant = true;
setValue(id, value, isConstant);
}
Value Variables::getUserDefinedValue(Variables::Id id) const {
invariant(isUserDefinedVariable(id));
uassert(40434,
str::stream() << "Requesting Variables::getValue with an out of range id: " << id,
static_cast<size_t>(id) < _valueList.size());
return _valueList[id].value;
}
Value Variables::getValue(Id id, const Document& root) const {
if (id < 0) {
// This is a reserved id for a builtin variable.
switch (id) {
case Variables::kRootId:
return Value(root);
case Variables::kRemoveId:
return Value();
default:
MONGO_UNREACHABLE;
}
}
return getUserDefinedValue(id);
}
Document Variables::getDocument(Id id, const Document& root) const {
if (id == Variables::kRootId) {
// For the common case of ROOT, avoid round-tripping through Value.
return root;
}
const Value var = getValue(id, root);
if (var.getType() == Object)
return var.getDocument();
return Document();
}
Variables::Id VariablesParseState::defineVariable(StringData name) {
// Caller should have validated before hand by using Variables::uassertValidNameForUserWrite.
massert(17275,
"Can't redefine a non-user-writable variable",
Variables::kBuiltinVarNameToId.find(name) == Variables::kBuiltinVarNameToId.end());
Variables::Id id = _idGenerator->generateId();
invariant(id > _lastSeen);
_variables[name] = _lastSeen = id;
return id;
}
Variables::Id VariablesParseState::getVariable(StringData name) const {
auto it = _variables.find(name);
if (it != _variables.end()) {
// Found a user-defined variable.
return it->second;
}
it = Variables::kBuiltinVarNameToId.find(name);
if (it != Variables::kBuiltinVarNameToId.end()) {
// This is a builtin variable.
return it->second;
}
// If we didn't find either a user-defined or builtin variable, then we reject everything other
// than CURRENT. If this is CURRENT, then we treat it as equivalent to ROOT.
uassert(17276, str::stream() << "Use of undefined variable: " << name, name == "CURRENT");
return Variables::kRootId;
}
std::set<Variables::Id> VariablesParseState::getDefinedVariableIDs() const {
std::set<Variables::Id> ids;
for (auto&& keyId : _variables) {
ids.insert(keyId.second);
}
return ids;
}
}
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