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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.
*/
#pragma once
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/expression_dependencies.h"
namespace mongo {
class DocumentSourceRedact final : public DocumentSource {
public:
static constexpr StringData kStageName = "$redact"_sd;
const char* getSourceName() const final;
boost::intrusive_ptr<DocumentSource> optimize() final;
StageConstraints constraints(Pipeline::SplitState pipeState) const final {
return {StreamType::kStreaming,
PositionRequirement::kNone,
HostTypeRequirement::kNone,
DiskUseRequirement::kNoDiskUse,
FacetRequirement::kAllowed,
TransactionRequirement::kAllowed,
LookupRequirement::kAllowed,
UnionRequirement::kAllowed,
ChangeStreamRequirement::kAllowlist};
}
boost::optional<DistributedPlanLogic> distributedPlanLogic() final {
return boost::none;
}
/**
* Attempts to duplicate the redact-safe portion of a subsequent $match before the $redact
* stage.
*/
Pipeline::SourceContainer::iterator doOptimizeAt(Pipeline::SourceContainer::iterator itr,
Pipeline::SourceContainer* container) final;
static boost::intrusive_ptr<DocumentSource> createFromBson(
BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& expCtx);
Value serialize(SerializationOptions opts = SerializationOptions()) const final override;
boost::intrusive_ptr<Expression> getExpression() {
return _expression;
}
void addVariableRefs(std::set<Variables::Id>* refs) const final {
expression::addVariableRefs(_expression.get(), refs);
}
private:
DocumentSourceRedact(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const boost::intrusive_ptr<Expression>& previsit);
GetNextResult doGetNext() final;
// These both work over pExpCtx->variables.
boost::optional<Document> redactObject(const Document& root); // redacts CURRENT
Value redactValue(const Value& in, const Document& root);
Variables::Id _currentId;
boost::intrusive_ptr<Expression> _expression;
};
} // namespace mongo
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