BookOffers.hpp

#pragma once
 
#include "data/AmendmentCenterInterface.hpp"
#include "data/BackendInterface.hpp"
#include "rpc/Errors.hpp"
#include "rpc/JS.hpp"
#include "rpc/common/MetaProcessors.hpp"
#include "rpc/common/Modifiers.hpp"
#include "rpc/common/Specs.hpp"
#include "rpc/common/Types.hpp"
#include "rpc/common/Validators.hpp"
 
#include <boost/json/array.hpp>
#include <boost/json/conversion.hpp>
#include <boost/json/object.hpp>
#include <boost/json/value.hpp>
#include <xrpl/protocol/AccountID.h>
#include <xrpl/protocol/ErrorCodes.h>
#include <xrpl/protocol/UintTypes.h>
#include <xrpl/protocol/jss.h>
 
#include <cstdint>
#include <memory>
#include <optional>
#include <string>
 
namespace rpc {

class BookOffersHandler {
    std::shared_ptr<BackendInterface> sharedPtrBackend_;
    std::shared_ptr<data::AmendmentCenterInterface const> amendmentCenter_;
 
public:
    static constexpr auto kLIMIT_MIN = 1;
    static constexpr auto kLIMIT_MAX = 100;
    static constexpr auto kLIMIT_DEFAULT = 60;

    struct Output {
        std::string ledgerHash;
        uint32_t ledgerIndex;
        boost::json::array offers;
        bool validated = true;
    };

    struct Input {
        std::optional<std::string> ledgerHash;
        std::optional<uint32_t> ledgerIndex;
        uint32_t limit = kLIMIT_DEFAULT;
        std::optional<ripple::AccountID> taker;
        ripple::Currency paysCurrency;
        ripple::Currency getsCurrency;
        // accountID will be filled by input converter, if no issuer is given, will use XRP issuer
        ripple::AccountID paysID = ripple::xrpAccount();
        ripple::AccountID getsID = ripple::xrpAccount();
        std::optional<std::string> domain;
    };
 
    using Result = HandlerReturnType<Output>;

    BookOffersHandler(
        std::shared_ptr<BackendInterface> sharedPtrBackend,
        std::shared_ptr<data::AmendmentCenterInterface const> const& amendmentCenter
    )
        : sharedPtrBackend_(std::move(sharedPtrBackend)), amendmentCenter_{amendmentCenter}
    {
    }

    static RpcSpecConstRef
    spec([[maybe_unused]] uint32_t apiVersion)
    {
        static auto const kRPC_SPEC = RpcSpec{
            {JS(taker_gets),
             validation::Required{},
             validation::Type<boost::json::object>{},
             meta::Section{
                 {JS(currency),
                  validation::Required{},
                  meta::WithCustomError{
                      validation::CustomValidators::currencyValidator,
                      Status(RippledError::rpcDST_AMT_MALFORMED)
                  }},
                 {JS(issuer),
                  meta::WithCustomError{
                      validation::CustomValidators::issuerValidator,
                      Status(RippledError::rpcDST_ISR_MALFORMED)
                  }}
             }},
            {JS(taker_pays),
             validation::Required{},
             validation::Type<boost::json::object>{},
             meta::Section{
                 {JS(currency),
                  validation::Required{},
                  meta::WithCustomError{
                      validation::CustomValidators::currencyValidator,
                      Status(RippledError::rpcSRC_CUR_MALFORMED)
                  }},
                 {JS(issuer),
                  meta::WithCustomError{
                      validation::CustomValidators::issuerValidator,
                      Status(RippledError::rpcSRC_ISR_MALFORMED)
                  }}
             }},
            // return INVALID_PARAMS if account format is wrong for "taker"
            {JS(taker),
             meta::WithCustomError{
                 validation::CustomValidators::accountValidator,
                 Status(RippledError::rpcINVALID_PARAMS, "Invalid field 'taker'.")
             }},
            {JS(domain),
             meta::WithCustomError{
                 validation::Type<std::string>{},
                 Status(RippledError::rpcDOMAIN_MALFORMED, "Unable to parse domain.")
             },
             meta::WithCustomError{
                 validation::CustomValidators::uint256HexStringValidator,
                 Status(RippledError::rpcDOMAIN_MALFORMED, "Unable to parse domain.")
             }},
            {JS(limit),
             validation::Type<uint32_t>{},
             validation::Min(1u),
             modifiers::Clamp<int32_t>{kLIMIT_MIN, kLIMIT_MAX}},
            {JS(ledger_hash), validation::CustomValidators::uint256HexStringValidator},
            {JS(ledger_index), validation::CustomValidators::ledgerIndexValidator},
        };
 
        return kRPC_SPEC;
    }

    Result
    process(Input const& input, Context const& ctx) const;
 
private:
    friend void
    tag_invoke(boost::json::value_from_tag, boost::json::value& jv, Output const& output);

    friend Input
    tag_invoke(boost::json::value_to_tag<Input>, boost::json::value const& jv);
};
}  // namespace rpc