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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.
*/
#pragma once
#include <sstream>
#include <string>
#include "mongo/base/status.h"
#include "mongo/bson/util/builder.h"
#include "mongo/db/auth/restriction_environment.h"
namespace mongo {
// Represents a restriction which may be attached to a user or role.
// A client authenticating as a user with a restriction, or as a user which possesses a role with a
// restriction, must be able to meet it. There are potentially many different 'types' of
// restriction. Their evaluation logic is implemented in child classes which conform to this
// interface.
template <typename S>
class Restriction {
public:
using serialization_type = S;
Restriction() = default;
virtual ~Restriction() = default;
// Returns True if the restriction is met by the RestrictionEnvironment.
// Implemented by child classes.
virtual Status validate(const RestrictionEnvironment& environment) const = 0;
friend std::ostream& operator<<(std::ostream& os, const Restriction& r) {
r.serialize(os);
return os;
}
friend StringBuilder& operator<<(StringBuilder& sb, const Restriction& r) {
return sb << r.toString();
}
std::string toString() const {
std::ostringstream oss;
oss << *this;
return oss.str();
}
virtual void appendToBuilder(typename serialization_type::bson_builder_type* builder) const = 0;
private:
// Stringifies the Restriction.
virtual void serialize(std::ostream& os) const = 0;
};
namespace restriction_detail {
struct NamedRestrictionImpl {
using bson_type = BSONObj;
using bson_builder_type = BSONObjBuilder;
static bson_type finalize(bson_builder_type* builder) {
return builder->obj();
}
};
struct UnnamedRestrictionImpl {
using bson_type = BSONArray;
using bson_builder_type = BSONArrayBuilder;
static bson_type finalize(bson_builder_type* builder) {
return builder->arr();
}
};
} // namespace restriction_detail
using NamedRestriction = Restriction<restriction_detail::NamedRestrictionImpl>;
using UnnamedRestriction = Restriction<restriction_detail::UnnamedRestrictionImpl>;
} // namespace mongo
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