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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/query/fle/encrypted_predicate.h"
namespace mongo::fle {
/**
* Server-side rewrite for the encrypted equality index. This rewrite expects either a $eq or $in
* expression.
*/
class EqualityPredicate : public EncryptedPredicate {
public:
EqualityPredicate(const QueryRewriterInterface* rewriter) : EncryptedPredicate(rewriter) {}
protected:
std::vector<PrfBlock> generateTags(BSONValue payload) const override;
std::unique_ptr<MatchExpression> rewriteToTagDisjunction(MatchExpression* expr) const override;
std::unique_ptr<Expression> rewriteToTagDisjunction(Expression* expr) const override;
std::unique_ptr<MatchExpression> rewriteToRuntimeComparison(
MatchExpression* expr) const override;
std::unique_ptr<Expression> rewriteToRuntimeComparison(Expression* expr) const override;
bool isDeprecatedPayloadType(EncryptedBinDataType type) const override {
return type == EncryptedBinDataType::kFLE2FindEqualityPayload ||
type == EncryptedBinDataType::kFLE2UnindexedEncryptedValue;
}
private:
EncryptedBinDataType encryptedBinDataType() const override {
return EncryptedBinDataType::kFLE2FindEqualityPayloadV2;
}
boost::optional<std::pair<ExpressionFieldPath*, ExpressionConstant*>>
extractDetailsFromComparison(ExpressionCompare* eqExpr) const;
boost::optional<const ExpressionFieldPath*> validateIn(ExpressionIn* inExpr,
ExpressionArray* inList) const;
};
} // namespace mongo::fle
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