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/**
* Copyright (C) 2022-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 "mongo/crypto/fle_crypto.h"
#include "mongo/db/pipeline/expression_context.h"
namespace mongo {
class FLETagQueryInterface;
namespace fle {
enum class EncryptedCollScanMode {
// Always use high cardinality filters, used by tests
kForceAlways,
// Use high cardinality mode if $in rewrites do not fit in the
// internalQueryFLERewriteMemoryLimit memory limit
kUseIfNeeded,
// Do not rewrite into high cardinality filter, throw exceptions instead
// Some contexts like upsert do not support $expr
kDisallow,
};
/**
* Low Selectivity rewrites use $expr which is not supported in all commands such as upserts.
*/
enum class EncryptedCollScanModeAllowed {
kAllow,
kDisallow,
};
/**
* Pure virtual class that allows encrypted predicate rewrites to be unit tested independently from
* the actual server rewrite.
*/
class QueryRewriterInterface {
public:
virtual ~QueryRewriterInterface() {}
virtual FLETagQueryInterface* getTagQueryInterface() const = 0;
virtual const NamespaceString& getESCNss() const = 0;
virtual EncryptedCollScanMode getEncryptedCollScanMode() const = 0;
virtual ExpressionContext* getExpressionContext() const = 0;
};
} // namespace fle
} // namespace mongo
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