claims_digest.h

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the Apache 2.0 License.
#pragma once
 
#include "ccf/crypto/sha256_hash.h"
 
namespace ccf
{
  class ClaimsDigest
  {
  public:
    using Digest = ccf::crypto::Sha256Hash;
 
  private:
    bool is_set = false;
    Digest digest;
 
  public:
    ClaimsDigest() = default;
 
    void set(Digest&& digest_)
    {
      is_set = true;
      digest = std::move(digest_);
    }
 
    void set(Digest::Representation&& r)
    {
      is_set = true;
      digest.set(r);
    }
 
    [[nodiscard]] bool empty() const
    {
      return !is_set;
    }
 
    [[nodiscard]] const Digest& value() const
    {
      return digest;
    }
 
    bool operator==(const ClaimsDigest& other) const
    {
      return (is_set == other.is_set) && (digest == other.digest);
    }
  };
 
  inline void to_json(nlohmann::json& j, const ClaimsDigest& hash)
  {
    j = hash.value();
  }
 
  inline void from_json(const nlohmann::json& j, ClaimsDigest& hash)
  {
    hash.set(j.get<ClaimsDigest::Digest>());
  }
 
  inline std::string schema_name(
    [[maybe_unused]] const ClaimsDigest* claims_digest_type)
  {
    return ds::json::schema_name<ClaimsDigest::Digest>();
  }
 
  inline void fill_json_schema(
    nlohmann::json& schema,
    [[maybe_unused]] const ClaimsDigest* claims_digest_type)
  {
    ds::json::fill_schema<ClaimsDigest::Digest>(schema);
  }
 
  static ClaimsDigest empty_claims()
  {
    ClaimsDigest cd;
    cd.set(ClaimsDigest::Digest::Representation());
    return cd;
  }
}