model.hpp

#ifndef OC_ISSUER_MODEL_HPP
#define OC_ISSUER_MODEL_HPP
 
#include <chrono>
#include <memory>
#include <optional>
#include <string>
 
#include "crow/json.h"
 
#include "tl/expected.hpp"
#include "big_int.hpp"
 
struct PublicKey {
  BigInt modulus; //: "daaa63ddda38c189b8c49020c8276adbe0a695685a...",
  BigInt public_exponent;//: 65537,
 
    [[nodiscard]] crow::json::wvalue to_json() const;
};
 
struct WeightedUrl {
  uint32_t weight;
  std::string url;
 
    [[nodiscard]] crow::json::wvalue to_json() const;
};
 
struct CDD {
 
  std::string additional_info;
  time_t cdd_expiry_date;    
  std::string cdd_location;  
  size_t cdd_serial;         
  time_t cdd_signing_date;   
  size_t currency_divisor;   
  std::string currency_name; 
  std::vector<unsigned>
      denominations; 
  BigInt id;         
 
  std::vector<WeightedUrl> info_service;
  /* eCipherSuite*/
  std::string issuer_cipher_suite; 
  PublicKey issuer_public_master_key; 
  std::vector<WeightedUrl> mint_service;
  std::string protocol_version; // e.g. https://opencoin.org/1.0
  std::vector<WeightedUrl> redeem_service;
  std::vector<WeightedUrl> renew_service;
 
  [[nodiscard]] crow::json::wvalue to_json() const;
};
 
struct CDDC {
  CDD cdd;
  std::string signature;
 
    [[nodiscard]] crow::json::wvalue to_json() const;
};
 
struct MintKey {
  unsigned int cdd_serial;
  std::string coins_expiry_date; //": "2023-10-30T15:45:53.164685",
  unsigned int denomination; //": 1,
  BigInt id;   // "1ceb977bb531c65f133ab8b0d60862b17369d96",
  BigInt issuer_id; //": "23ed956e629ba35f0002eaf833ea436aea7db5c2",
  PublicKey public_mint_key;
 
  std::string sign_coins_not_after;
  std::string sign_coins_not_before;
  //    "type": "mint key"
  [[nodiscard]] crow::json::wvalue to_json() const;
};
 
struct MintKeyCert {
  MintKey mint_key;
  std::string signature;
 
    [[nodiscard]] crow::json::wvalue to_json() const;
};
 
enum class eError {
  JSON_PARSE_ERROR,
  JSON_MISSING_KEY,
  JSON_WRONG_REQUEST_TYPE,
  JSON_WRONG_VALUE_TYPE,
  JSON_ERROR,
  NOT_IMPLEMENTED
};
 
struct Response {
  unsigned int message_reference;
  unsigned int status_code;
  std::string status_description;
 
    [[nodiscard]] virtual crow::json::wvalue to_json() const=0;
};
 
struct RequestCDDCSerial {
  unsigned int message_reference; 
  static tl::expected<RequestCDDCSerial, eError>
  from_string(const std::string &str);
};
 
struct ResponseCDDCSerial : Response {
  unsigned int cdd_serial{0U};
 
    [[nodiscard]] crow::json::wvalue to_json() const override;
};
 
struct RequestCDDC {
  unsigned int cdd_serial;        
  unsigned int message_reference; 
  static tl::expected<RequestCDDC, eError> from_string(const std::string &str);
};
 
struct ResponseCDDC : Response {
  CDDC cddc;
 
    [[nodiscard]] crow::json::wvalue to_json() const override;
};
 
struct RequestMKCs {
  std::vector<unsigned int> denominations;
  unsigned int message_reference; 
  std::vector<BigInt> mint_key_ids;
  //  "type": "request mint key certificates"
  static tl::expected<RequestMKCs, eError> from_string(const std::string &str);
};
 
struct ResponseMKCs : Response {
  std::vector<MintKeyCert> keys;
 
    [[nodiscard]] crow::json::wvalue to_json() const override;
};
 
struct Blind {
  BigInt blinded_payload_hash; //bigint
  BigInt mint_key_id; //bigint
  std::string reference;
    [[nodiscard]] crow::json::wvalue to_json() const;
  static tl::expected<Blind, eError> from_json(const crow::json::rvalue &json);
};
 
struct BlindSignature {
  BigInt blind_signature;
  std::string reference;
    [[nodiscard]] crow::json::wvalue to_json() const;
};
 
struct RequestMint {
  unsigned int message_reference; 
  BigInt transaction_reference; 
  std::vector<Blind> blinds;
  //  "type": "request mint"
  static tl::expected<RequestMint, eError> from_string(const std::string &str);
};
 
struct ResponseMint : Response {
  std::vector<BlindSignature> blind_signatures;
 
    [[nodiscard]] crow::json::wvalue to_json() const override;
};
 
struct Coin {
  struct Payload {
    std::string cdd_location;
    unsigned int denomination;
    BigInt issuer_id;
    BigInt mint_key_id;
    std::string protocol_version;
    BigInt serial;
 
      [[nodiscard]] crow::json::wvalue to_json() const;
    static tl::expected<Payload,eError> from_json(const crow::json::rvalue& json);
  };
 
  Payload payload;
  std::string signature;
 
    [[nodiscard]] crow::json::wvalue to_json() const;
  static tl::expected<Coin, eError> from_json(const crow::json::rvalue &json);
};
 
struct CoinStack {
  std::vector<Coin> coins;
  std::string subject;
  //  "type": "coinstack"
  [[nodiscard]]  crow::json::wvalue to_json() const;
};
 
struct RequestRenew {
  std::vector<Blind> blinds;
  std::vector<Coin> coins;
  unsigned int message_reference; 
  std::string transaction_reference;
  //  "type": "request renew"
  static tl::expected<RequestRenew, eError> from_string(const std::string &str);
};
 
struct ResponseDelay : Response {
    [[nodiscard]] crow::json::wvalue to_json() const override;
};
 
struct RequestResume {
  unsigned int message_reference; 
  BigInt transaction_reference; 
  //  "type": "request resume"
  static tl::expected<RequestResume, eError>
  from_string(const std::string &str);
};
 
struct RequestRedeem {
  std::vector<Coin> coins;
  unsigned int message_reference; 
  //  "type": "request redeem"
  static tl::expected<RequestRedeem, eError>
  from_string(const std::string &str);
};
 
struct ResponseRedeem : Response {
    [[nodiscard]] crow::json::wvalue to_json() const override;
};
 
class Model {
public:
  virtual ~Model()=default;
 
  virtual tl::expected<CDDC *, bool> get_cddc(unsigned int cdd_serial) = 0;
virtual tl::expected<CDDC *, bool> get_current_cddc() = 0;
 
  virtual std::vector<MintKeyCert>
  getMKCs(const std::vector<unsigned int> &denominations,
          const std::vector<BigInt> &mint_key_ids) = 0;
 
 
  virtual std::vector<BlindSignature>
  mint(std::string const& transaction_reference,
       const std::vector<Blind> &blinds) = 0;
 
  virtual bool redeem(const std::vector<Coin> &coins) = 0;
 
  static std::unique_ptr<Model> get_model(const std::string &backend_name);
 
private:
};
 
#endif // #ifndef OC_ISSUER_MODEL_HPP