//
// Copyright 2018 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_SRC_CORE_XDS_GRPC_XDS_COMMON_TYPES_H
#define GRPC_SRC_CORE_XDS_GRPC_XDS_COMMON_TYPES_H

#include <string>
#include <vector>

#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include "absl/types/variant.h"
#include "envoy/extensions/transport_sockets/tls/v3/tls.upb.h"
#include "google/protobuf/any.upb.h"
#include "google/protobuf/duration.upb.h"

#include <grpc/support/port_platform.h>

#include "src/core/lib/gprpp/time.h"
#include "src/core/lib/gprpp/validation_errors.h"
#include "src/core/lib/matchers/matchers.h"
#include "src/core/util/json/json.h"
#include "src/core/xds/xds_client/xds_resource_type.h"

namespace grpc_core {

Duration ParseDuration(const google_protobuf_Duration* proto_duration,
                       ValidationErrors* errors);

struct CommonTlsContext {
  struct CertificateProviderPluginInstance {
    std::string instance_name;
    std::string certificate_name;

    bool operator==(const CertificateProviderPluginInstance& other) const {
      return instance_name == other.instance_name &&
             certificate_name == other.certificate_name;
    }

    std::string ToString() const;
    bool Empty() const;
  };

  struct CertificateValidationContext {
    CertificateProviderPluginInstance ca_certificate_provider_instance;
    std::vector<StringMatcher> match_subject_alt_names;

    bool operator==(const CertificateValidationContext& other) const {
      return ca_certificate_provider_instance ==
                 other.ca_certificate_provider_instance &&
             match_subject_alt_names == other.match_subject_alt_names;
    }

    std::string ToString() const;
    bool Empty() const;
  };

  CertificateValidationContext certificate_validation_context;
  CertificateProviderPluginInstance tls_certificate_provider_instance;

  bool operator==(const CommonTlsContext& other) const {
    return certificate_validation_context ==
               other.certificate_validation_context &&
           tls_certificate_provider_instance ==
               other.tls_certificate_provider_instance;
  }

  std::string ToString() const;
  bool Empty() const;

  static CommonTlsContext Parse(
      const XdsResourceType::DecodeContext& context,
      const envoy_extensions_transport_sockets_tls_v3_CommonTlsContext*
          common_tls_context_proto,
      ValidationErrors* errors);
};

struct XdsExtension {
  // The type, either from the top level or from inside the TypedStruct.
  absl::string_view type;
  // A Json object for a TypedStruct, or the serialized config otherwise.
  absl::variant<absl::string_view /*serialized_value*/, Json /*typed_struct*/>
      value;
  // Validation fields that need to stay in scope until we're done
  // processing the extension.
  std::vector<ValidationErrors::ScopedField> validation_fields;
};

absl::optional<XdsExtension> ExtractXdsExtension(
    const XdsResourceType::DecodeContext& context,
    const google_protobuf_Any* any, ValidationErrors* errors);

}  // namespace grpc_core

#endif  // GRPC_SRC_CORE_XDS_GRPC_XDS_COMMON_TYPES_H
