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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.
*/
#pragma once
#include <string>
#include "mongo/base/string_data.h"
#include "mongo/bson/bsonelement.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/auth/role_name.h"
#include "mongo/db/auth/user_name.h"
#include "mongo/stdx/variant.h"
namespace mongo {
namespace auth {
/**
* Wraps the usersInfo and rolesInfo command args.
*
* These commands accept the following formats:
* {....sInfo: 1} // All users on the current DB.
* {usersInfo: {forAllDBs: 1}} // All users on all DBs. (usersInfo only)
*
* {....sInfo: 'alice'} // Specific user on current DB.
* {....sInfo: {db: 'test', user: 'alice'} // Specific user on specific DB.
* {....sInfo: [stringOrDoc]} // Set of users (using above two formats)
*
* Use isAllOnCurrentDB(), isAllForAllDBs(), and isExact() to determine format.
* Then use getElements(dbname) for isExact() form to get list of T names.
*/
template <typename T, bool enableForAllDBs>
class UMCInfoCommandArg {
public:
UMCInfoCommandArg() : UMCInfoCommandArg(AllOnCurrentDB{}) {}
static_assert(std::is_same<UserName, T>::value || std::is_same<RoleName, T>::value,
"UMCInfoCommandArg only valid with T = UserName | RoleName");
static UMCInfoCommandArg parseFromBSON(const BSONElement& elem) {
if (elem.numberInt() == 1) {
return UMCInfoCommandArg(AllOnCurrentDB{});
}
if (enableForAllDBs && (elem.type() == Object) && (elem.Obj()[kForAllDBs].trueValue())) {
return UMCInfoCommandArg(AllForAllDBs{});
}
if (elem.type() == Array) {
Multiple values;
for (const auto& v : elem.Obj()) {
values.push_back(parseNamedElement(v));
}
return UMCInfoCommandArg(std::move(values));
}
return UMCInfoCommandArg(parseNamedElement(elem));
}
void serializeToBSON(StringData fieldName, BSONObjBuilder* bob) const {
if (stdx::holds_alternative<AllOnCurrentDB>(_value)) {
bob->append(fieldName, 1);
} else if (stdx::holds_alternative<AllForAllDBs>(_value)) {
bob->append(fieldName, BSON(kForAllDBs << 1));
} else if (stdx::holds_alternative<Single>(_value)) {
serializeSingle(fieldName, bob, stdx::get<Single>(_value));
} else {
invariant(stdx::holds_alternative<Multiple>(_value));
const auto& elems = stdx::get<Multiple>(_value);
BSONArrayBuilder setBuilder(bob->subarrayStart(fieldName));
for (const auto& elem : elems) {
serializeSingle(&setBuilder, elem);
}
setBuilder.doneFast();
}
}
void serializeToBSON(BSONArrayBuilder* bob) const {
// Minimize code duplication by using object serialization path.
// In practice, we don't use this API, it only exists for IDL completeness.
BSONObjBuilder tmp;
serializeToBSON("", &tmp);
auto elem = tmp.obj();
bob->append(elem.firstElement());
}
/**
* {usersInfo: 1}
*/
bool isAllOnCurrentDB() const {
return stdx::holds_alternative<AllOnCurrentDB>(_value);
}
/**
* {usersInfo: {forrAllDBs: 1}}
*/
bool isAllForAllDBs() const {
return stdx::holds_alternative<AllForAllDBs>(_value);
}
/**
* {usersInfo: 'string' | {db,user|role} | [...] }
*/
bool isExact() const {
return stdx::holds_alternative<Single>(_value) || stdx::holds_alternative<Multiple>(_value);
}
/**
* For isExact() commands, returns a set of T with unspecified DB names resolved with $dbname.
*/
std::vector<T> getElements(StringData dbname) const {
if (!isExact()) {
dassert(false);
uasserted(ErrorCodes::InternalError, "Unable to get exact match for wildcard query");
}
if (stdx::holds_alternative<Single>(_value)) {
return {getElement(stdx::get<Single>(_value), dbname)};
} else {
invariant(stdx::holds_alternative<Multiple>(_value));
const auto& values = stdx::get<Multiple>(_value);
std::vector<T> ret;
std::transform(values.cbegin(),
values.cend(),
std::back_inserter(ret),
[dbname](const auto& value) { return getElement(value, dbname); });
return ret;
}
}
private:
static constexpr StringData kForAllDBs = "forAllDBs"_sd;
struct AllOnCurrentDB {};
struct AllForAllDBs {};
using Single = stdx::variant<T, std::string>;
using Multiple = std::vector<Single>;
explicit UMCInfoCommandArg(AllOnCurrentDB opt) : _value(std::move(opt)) {}
explicit UMCInfoCommandArg(AllForAllDBs opt) : _value(std::move(opt)) {}
explicit UMCInfoCommandArg(Single value) : _value(std::move(value)) {}
explicit UMCInfoCommandArg(Multiple values) : _value(std::move(values)) {}
static Single parseNamedElement(const BSONElement& elem) {
if (elem.type() == String) {
return elem.String();
}
return T::parseFromBSON(elem);
}
static void serializeSingle(StringData fieldName, BSONObjBuilder* builder, Single elem) {
if (stdx::holds_alternative<T>(elem)) {
builder->append(fieldName, stdx::get<T>(elem).toBSON());
} else {
invariant(stdx::holds_alternative<std::string>(elem));
builder->append(fieldName, stdx::get<std::string>(elem));
}
}
static void serializeSingle(BSONArrayBuilder* builder, Single elem) {
if (stdx::holds_alternative<T>(elem)) {
builder->append(stdx::get<T>(elem).toBSON());
} else {
invariant(stdx::holds_alternative<std::string>(elem));
builder->append(stdx::get<std::string>(elem));
}
}
static T getElement(Single elem, StringData dbname) {
if (stdx::holds_alternative<T>(elem)) {
return stdx::get<T>(elem);
} else {
invariant(stdx::holds_alternative<std::string>(elem));
return T(stdx::get<std::string>(elem), dbname);
}
}
// Single is stored as a distinct type from Multiple
// to ensure that reserialization maintains the same level of nesting.
stdx::variant<AllOnCurrentDB, AllForAllDBs, Single, Multiple> _value;
};
using UsersInfoCommandArg = UMCInfoCommandArg<UserName, true>;
using RolesInfoCommandArg = UMCInfoCommandArg<RoleName, false>;
} // namespace auth
} // namespace mongo
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