evaluator_core.h

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// Copyright 2020 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#ifndef GRPC_CORE_LIB_SECURITY_AUTHORIZATION_MOCK_CEL_EVALUATOR_CORE_H
#define GRPC_CORE_LIB_SECURITY_AUTHORIZATION_MOCK_CEL_EVALUATOR_CORE_H
 
#include <grpc/support/port_platform.h>
 
#include <set>
#include <string>
 
#include "absl/status/statusor.h"
#include "google/api/expr/v1alpha1/syntax.upb.h"
 
#include "src/core/lib/security/authorization/mock_cel/activation.h"
#include "src/core/lib/security/authorization/mock_cel/cel_expression.h"
#include "src/core/lib/security/authorization/mock_cel/cel_value.h"
 
namespace grpc_core {
namespace mock_cel {
 
// This is a temporary stub implementation of CEL APIs.
// Once gRPC imports the CEL library, this file will be removed.
 
class ExecutionPath {
 public:
  ExecutionPath() = default;
};
 
// Implementation of the CelExpression that utilizes flattening
// of the expression tree.
class CelExpressionFlatImpl : public CelExpression {
  // Constructs CelExpressionFlatImpl instance.
  // path is flat execution path that is based upon
  // flattened AST tree. Max iterations dictates the maximum number of
  // iterations in the comprehension expressions (use 0 to disable the upper
  // bound).
 public:
  CelExpressionFlatImpl(const google_api_expr_v1alpha1_Expr* root_expr,
                        ExecutionPath path, int max_iterations,
                        std::set<std::string> iter_variable_names,
                        bool enable_unknowns = false,
                        bool enable_unknown_function_results = false) {}
 
  // Implementation of CelExpression evaluate method.
  absl::StatusOr<CelValue> Evaluate(
      const BaseActivation& activation) const override {
    return CelValue::CreateNull();
  }
};
 
}  // namespace mock_cel
}  // namespace grpc_core
 
#endif  // GRPC_CORE_LIB_SECURITY_AUTHORIZATION_MOCK_CEL_EVALUATOR_CORE_H