// Copyright (c) 2014-2016, The Monero Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers

#include "include_base_utils.h"
using namespace epee;

#include "wallet_rpc_server.h"
#include "common/command_line.h"
#include "cryptonote_core/cryptonote_format_utils.h"
#include "cryptonote_core/account.h"
#include "wallet_rpc_server_commands_defs.h"
#include "misc_language.h"
#include "string_tools.h"
#include "crypto/hash.h"

namespace tools
{
  //-----------------------------------------------------------------------------------
  const command_line::arg_descriptor<std::string> wallet_rpc_server::arg_rpc_bind_port = {"rpc-bind-port", "Starts wallet as rpc server for wallet operations, sets bind port for server", "", true};
  const command_line::arg_descriptor<std::string> wallet_rpc_server::arg_rpc_bind_ip = {"rpc-bind-ip", "Specify ip to bind rpc server", "127.0.0.1"};

  void wallet_rpc_server::init_options(boost::program_options::options_description& desc)
  {
    command_line::add_arg(desc, arg_rpc_bind_ip);
    command_line::add_arg(desc, arg_rpc_bind_port);
  }
  //------------------------------------------------------------------------------------------------------------------------------
  wallet_rpc_server::wallet_rpc_server(wallet2& w):m_wallet(w)
  {}
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::run()
  {
    m_stop = false;
    m_net_server.add_idle_handler([this](){
      try {
        m_wallet.refresh();
      } catch (const std::exception& ex) {
        LOG_ERROR("Exception at while refreshing, what=" << ex.what());
      }
      return true;
    }, 20000);
    m_net_server.add_idle_handler([this](){
      if (m_stop.load(std::memory_order_relaxed))
      {
        send_stop_signal();
        return false;
      }
      return true;
    }, 500);

    //DO NOT START THIS SERVER IN MORE THEN 1 THREADS WITHOUT REFACTORING
    return epee::http_server_impl_base<wallet_rpc_server, connection_context>::run(1, true);
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::handle_command_line(const boost::program_options::variables_map& vm)
  {
    m_bind_ip = command_line::get_arg(vm, arg_rpc_bind_ip);
    m_port = command_line::get_arg(vm, arg_rpc_bind_port);
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::init(const boost::program_options::variables_map& vm)
  {
    m_net_server.set_threads_prefix("RPC");
    bool r = handle_command_line(vm);
    CHECK_AND_ASSERT_MES(r, false, "Failed to process command line in core_rpc_server");
    return epee::http_server_impl_base<wallet_rpc_server, connection_context>::init(m_port, m_bind_ip);
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_getbalance(const wallet_rpc::COMMAND_RPC_GET_BALANCE::request& req, wallet_rpc::COMMAND_RPC_GET_BALANCE::response& res, epee::json_rpc::error& er)
  {
    try
    {
      res.balance = m_wallet.balance();
      res.unlocked_balance = m_wallet.unlocked_balance();
    }
    catch (std::exception& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = e.what();
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_getaddress(const wallet_rpc::COMMAND_RPC_GET_ADDRESS::request& req, wallet_rpc::COMMAND_RPC_GET_ADDRESS::response& res, epee::json_rpc::error& er)
  {
    try
    {
      res.address = m_wallet.get_account().get_public_address_str(m_wallet.testnet());
    }
    catch (std::exception& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = e.what();
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_getheight(const wallet_rpc::COMMAND_RPC_GET_HEIGHT::request& req, wallet_rpc::COMMAND_RPC_GET_HEIGHT::response& res, epee::json_rpc::error& er)
  {
    try
    {
      res.height = m_wallet.get_blockchain_current_height();
    }
    catch (std::exception& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = e.what();
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::validate_transfer(const std::list<wallet_rpc::transfer_destination> destinations, std::string payment_id, std::vector<cryptonote::tx_destination_entry>& dsts, std::vector<uint8_t>& extra, epee::json_rpc::error& er)
  {
    crypto::hash8 integrated_payment_id = cryptonote::null_hash8;
    std::string extra_nonce;
    for (auto it = destinations.begin(); it != destinations.end(); it++)
    {
      cryptonote::tx_destination_entry de;
      bool has_payment_id;
      crypto::hash8 new_payment_id;
      if(!get_account_integrated_address_from_str(de.addr, has_payment_id, new_payment_id, m_wallet.testnet(), it->address))
      {
        er.code = WALLET_RPC_ERROR_CODE_WRONG_ADDRESS;
        er.message = std::string("WALLET_RPC_ERROR_CODE_WRONG_ADDRESS: ") + it->address;
        return false;
      }
      de.amount = it->amount;
      dsts.push_back(de);

      if (has_payment_id)
      {
        if (!payment_id.empty() || integrated_payment_id != cryptonote::null_hash8)
        {
          er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
          er.message = "A single payment id is allowed per transaction";
          return false;
        }
        integrated_payment_id = new_payment_id;
        cryptonote::set_encrypted_payment_id_to_tx_extra_nonce(extra_nonce, integrated_payment_id);
      }
    }

    if (!payment_id.empty())
    {

      /* Just to clarify */
      const std::string& payment_id_str = payment_id;

      crypto::hash long_payment_id;
      crypto::hash8 short_payment_id;

      /* Parse payment ID */
      if (wallet2::parse_long_payment_id(payment_id_str, long_payment_id)) {
        cryptonote::set_payment_id_to_tx_extra_nonce(extra_nonce, long_payment_id);
      }
      /* or short payment ID */
      else if (!wallet2::parse_short_payment_id(payment_id_str, short_payment_id)) {
        cryptonote::set_encrypted_payment_id_to_tx_extra_nonce(extra_nonce, short_payment_id);
      }
      else {
        er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
        er.message = "Payment id has invalid format: \"" + payment_id_str + "\", expected 16 or 64 character string";
        return false;
      }

      /* Append Payment ID data into extra */
      if (!cryptonote::add_extra_nonce_to_tx_extra(extra, extra_nonce)) {
        er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
        er.message = "Something went wront with payment_id. Please check its format: \"" + payment_id_str + "\", expected 64-character string";
        return false;
      }

    }
    return true;
  }

  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_transfer(const wallet_rpc::COMMAND_RPC_TRANSFER::request& req, wallet_rpc::COMMAND_RPC_TRANSFER::response& res, epee::json_rpc::error& er)
  {

    std::vector<cryptonote::tx_destination_entry> dsts;
    std::vector<uint8_t> extra;

    if (m_wallet.restricted())
    {
      er.code = WALLET_RPC_ERROR_CODE_DENIED;
      er.message = "Command unavailable in restricted mode.";
      return false;
    }

    // validate the transfer requested and populate dsts & extra
    if (!validate_transfer(req.destinations, req.payment_id, dsts, extra, er))
    {
      return false;
    }

    try
    {
      uint64_t mixin = req.mixin;
      if (mixin < 2 && m_wallet.use_fork_rules(2)) {
        LOG_PRINT_L1("Requested mixin " << req.mixin << " too low for hard fork 2, using 2");
        mixin = 2;
      }
      std::vector<wallet2::pending_tx> ptx_vector = m_wallet.create_transactions(dsts, mixin, req.unlock_time, req.fee, extra);

      // reject proposed transactions if there are more than one.  see on_transfer_split below.
      if (ptx_vector.size() != 1)
      {
        er.code = WALLET_RPC_ERROR_CODE_GENERIC_TRANSFER_ERROR;
        er.message = "Transaction would be too large.  try /transfer_split.";
        return false;
      }

      m_wallet.commit_tx(ptx_vector);

      // populate response with tx hash
      res.tx_hash = boost::lexical_cast<std::string>(cryptonote::get_transaction_hash(ptx_vector.back().tx));
      if (req.get_tx_key)
        res.tx_key = boost::lexical_cast<std::string>(ptx_vector.back().tx_key);
      return true;
    }
    catch (const tools::error::daemon_busy& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_DAEMON_IS_BUSY;
      er.message = e.what();
      return false;
    }
    catch (const std::exception& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_GENERIC_TRANSFER_ERROR;
      er.message = e.what();
      return false;
    }
    catch (...)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = "WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR";
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_transfer_split(const wallet_rpc::COMMAND_RPC_TRANSFER_SPLIT::request& req, wallet_rpc::COMMAND_RPC_TRANSFER_SPLIT::response& res, epee::json_rpc::error& er)
  {

    std::vector<cryptonote::tx_destination_entry> dsts;
    std::vector<uint8_t> extra;

    if (m_wallet.restricted())
    {
      er.code = WALLET_RPC_ERROR_CODE_DENIED;
      er.message = "Command unavailable in restricted mode.";
      return false;
    }

    // validate the transfer requested and populate dsts & extra; RPC_TRANSFER::request and RPC_TRANSFER_SPLIT::request are identical types.
    if (!validate_transfer(req.destinations, req.payment_id, dsts, extra, er))
    {
      return false;
    }

    try
    {
      uint64_t mixin = req.mixin;
      if (mixin < 2 && m_wallet.use_fork_rules(2)) {
        LOG_PRINT_L1("Requested mixin " << req.mixin << " too low for hard fork 2, using 2");
        mixin = 2;
      }
      std::vector<wallet2::pending_tx> ptx_vector;
      if (req.new_algorithm)
        ptx_vector = m_wallet.create_transactions_2(dsts, mixin, req.unlock_time, req.fee, extra);
      else
        ptx_vector = m_wallet.create_transactions(dsts, mixin, req.unlock_time, req.fee, extra);

      m_wallet.commit_tx(ptx_vector);

      // populate response with tx hashes
      for (auto & ptx : ptx_vector)
      {
        res.tx_hash_list.push_back(boost::lexical_cast<std::string>(cryptonote::get_transaction_hash(ptx.tx)));
        if (req.get_tx_keys)
          res.tx_key_list.push_back(boost::lexical_cast<std::string>(ptx.tx_key));
      }

      return true;
    }
    catch (const tools::error::daemon_busy& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_DAEMON_IS_BUSY;
      er.message = e.what();
      return false;
    }
    catch (const std::exception& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_GENERIC_TRANSFER_ERROR;
      er.message = e.what();
      return false;
    }
    catch (...)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = "WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR";
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_sweep_dust(const wallet_rpc::COMMAND_RPC_SWEEP_DUST::request& req, wallet_rpc::COMMAND_RPC_SWEEP_DUST::response& res, epee::json_rpc::error& er)
  {
    if (m_wallet.restricted())
    {
      er.code = WALLET_RPC_ERROR_CODE_DENIED;
      er.message = "Command unavailable in restricted mode.";
      return false;
    }

    try
    {
      std::vector<wallet2::pending_tx> ptx_vector = m_wallet.create_dust_sweep_transactions();

      m_wallet.commit_tx(ptx_vector);

      // populate response with tx hashes
      for (auto & ptx : ptx_vector)
      {
        res.tx_hash_list.push_back(boost::lexical_cast<std::string>(cryptonote::get_transaction_hash(ptx.tx)));
        if (req.get_tx_keys)
          res.tx_key_list.push_back(boost::lexical_cast<std::string>(ptx.tx_key));
      }

      return true;
    }
    catch (const tools::error::daemon_busy& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_DAEMON_IS_BUSY;
      er.message = e.what();
      return false;
    }
    catch (const std::exception& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_GENERIC_TRANSFER_ERROR;
      er.message = e.what();
      return false;
    }
    catch (...)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = "WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR";
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_make_integrated_address(const wallet_rpc::COMMAND_RPC_MAKE_INTEGRATED_ADDRESS::request& req, wallet_rpc::COMMAND_RPC_MAKE_INTEGRATED_ADDRESS::response& res, epee::json_rpc::error& er)
  {
    try
    {
      crypto::hash8 payment_id;
      if (req.payment_id.empty())
      {
        payment_id = crypto::rand<crypto::hash8>();
      }
      else
      {
        if (!tools::wallet2::parse_short_payment_id(req.payment_id,payment_id))
        {
          er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
          er.message = "Invalid payment ID";
          return false;
        }
      }

      res.integrated_address = m_wallet.get_account().get_public_integrated_address_str(payment_id, m_wallet.testnet());
      return true;
    }
    catch (std::exception &e)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = e.what();
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_split_integrated_address(const wallet_rpc::COMMAND_RPC_SPLIT_INTEGRATED_ADDRESS::request& req, wallet_rpc::COMMAND_RPC_SPLIT_INTEGRATED_ADDRESS::response& res, epee::json_rpc::error& er)
  {
    try
    {
      cryptonote::account_public_address address;
      crypto::hash8 payment_id;
      bool has_payment_id;

      if(!get_account_integrated_address_from_str(address, has_payment_id, payment_id, m_wallet.testnet(), req.integrated_address))
      {
        er.code = WALLET_RPC_ERROR_CODE_WRONG_ADDRESS;
        er.message = "Invalid address";
        return false;
      }
      if(!has_payment_id)
      {
        er.code = WALLET_RPC_ERROR_CODE_WRONG_ADDRESS;
        er.message = "Address is not an integrated address";
        return false;
      }
      res.standard_address = get_account_address_as_str(m_wallet.testnet(),address);
      res.payment_id = boost::lexical_cast<std::string>(payment_id);
      return true;
    }
    catch (std::exception &e)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = e.what();
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_store(const wallet_rpc::COMMAND_RPC_STORE::request& req, wallet_rpc::COMMAND_RPC_STORE::response& res, epee::json_rpc::error& er)
  {
    if (m_wallet.restricted())
    {
      er.code = WALLET_RPC_ERROR_CODE_DENIED;
      er.message = "Command unavailable in restricted mode.";
      return false;
    }

    try
    {
      m_wallet.store();
    }
    catch (std::exception& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = e.what();
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_get_payments(const wallet_rpc::COMMAND_RPC_GET_PAYMENTS::request& req, wallet_rpc::COMMAND_RPC_GET_PAYMENTS::response& res, epee::json_rpc::error& er)
  {
    crypto::hash payment_id;
    crypto::hash8 payment_id8;
    cryptonote::blobdata payment_id_blob;
    if(!epee::string_tools::parse_hexstr_to_binbuff(req.payment_id, payment_id_blob))
    {
      er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
      er.message = "Payment ID has invald format";
      return false;
    }

      if(sizeof(payment_id) == payment_id_blob.size())
      {
        payment_id = *reinterpret_cast<const crypto::hash*>(payment_id_blob.data());
      }
      else if(sizeof(payment_id8) == payment_id_blob.size())
      {
        payment_id8 = *reinterpret_cast<const crypto::hash8*>(payment_id_blob.data());
        memcpy(payment_id.data, payment_id8.data, 8);
        memset(payment_id.data + 8, 0, 24);
      }
      else
      {
        er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
        er.message = "Payment ID has invalid size: " + req.payment_id;
        return false;
      }

    res.payments.clear();
    std::list<wallet2::payment_details> payment_list;
    m_wallet.get_payments(payment_id, payment_list);
    for (auto & payment : payment_list)
    {
      wallet_rpc::payment_details rpc_payment;
      rpc_payment.payment_id   = req.payment_id;
      rpc_payment.tx_hash      = epee::string_tools::pod_to_hex(payment.m_tx_hash);
      rpc_payment.amount       = payment.m_amount;
      rpc_payment.block_height = payment.m_block_height;
      rpc_payment.unlock_time  = payment.m_unlock_time;
      res.payments.push_back(rpc_payment);
    }

    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_get_bulk_payments(const wallet_rpc::COMMAND_RPC_GET_BULK_PAYMENTS::request& req, wallet_rpc::COMMAND_RPC_GET_BULK_PAYMENTS::response& res, epee::json_rpc::error& er)
  {
    res.payments.clear();

    /* If the payment ID list is empty, we get payments to any payment ID (or lack thereof) */
    if (req.payment_ids.empty())
    {
      std::list<std::pair<crypto::hash,wallet2::payment_details>> payment_list;
      m_wallet.get_payments(payment_list, req.min_block_height);

      for (auto & payment : payment_list)
      {
        wallet_rpc::payment_details rpc_payment;
        rpc_payment.payment_id   = epee::string_tools::pod_to_hex(payment.first);
        rpc_payment.tx_hash      = epee::string_tools::pod_to_hex(payment.second.m_tx_hash);
        rpc_payment.amount       = payment.second.m_amount;
        rpc_payment.block_height = payment.second.m_block_height;
        rpc_payment.unlock_time  = payment.second.m_unlock_time;
        res.payments.push_back(std::move(rpc_payment));
      }

      return true;
    }

    for (auto & payment_id_str : req.payment_ids)
    {
      crypto::hash payment_id;
      crypto::hash8 payment_id8;
      cryptonote::blobdata payment_id_blob;

      // TODO - should the whole thing fail because of one bad id?

      if(!epee::string_tools::parse_hexstr_to_binbuff(payment_id_str, payment_id_blob))
      {
        er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
        er.message = "Payment ID has invalid format: " + payment_id_str;
        return false;
      }

      if(sizeof(payment_id) == payment_id_blob.size())
      {
        payment_id = *reinterpret_cast<const crypto::hash*>(payment_id_blob.data());
      }
      else if(sizeof(payment_id8) == payment_id_blob.size())
      {
        payment_id8 = *reinterpret_cast<const crypto::hash8*>(payment_id_blob.data());
        memcpy(payment_id.data, payment_id8.data, 8);
        memset(payment_id.data + 8, 0, 24);
      }
      else
      {
        er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
        er.message = "Payment ID has invalid size: " + payment_id_str;
        return false;
      }

      std::list<wallet2::payment_details> payment_list;
      m_wallet.get_payments(payment_id, payment_list, req.min_block_height);

      for (auto & payment : payment_list)
      {
        wallet_rpc::payment_details rpc_payment;
        rpc_payment.payment_id   = payment_id_str;
        rpc_payment.tx_hash      = epee::string_tools::pod_to_hex(payment.m_tx_hash);
        rpc_payment.amount       = payment.m_amount;
        rpc_payment.block_height = payment.m_block_height;
        rpc_payment.unlock_time  = payment.m_unlock_time;
        res.payments.push_back(std::move(rpc_payment));
      }
    }

    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_incoming_transfers(const wallet_rpc::COMMAND_RPC_INCOMING_TRANSFERS::request& req, wallet_rpc::COMMAND_RPC_INCOMING_TRANSFERS::response& res, epee::json_rpc::error& er)
  {
    if(req.transfer_type.compare("all") != 0 && req.transfer_type.compare("available") != 0 && req.transfer_type.compare("unavailable") != 0)
    {
      er.code = WALLET_RPC_ERROR_CODE_TRANSFER_TYPE;
      er.message = "Transfer type must be one of: all, available, or unavailable";
      return false;
    }

    bool filter = false;
    bool available = false;
    if (req.transfer_type.compare("available") == 0)
    {
      filter = true;
      available = true;
    }
    else if (req.transfer_type.compare("unavailable") == 0)
    {
      filter = true;
      available = false;
    }

    wallet2::transfer_container transfers;
    m_wallet.get_transfers(transfers);

    bool transfers_found = false;
    for (const auto& td : transfers)
    {
      if (!filter || available != td.m_spent)
      {
        if (!transfers_found)
        {
          transfers_found = true;
        }
        auto txBlob = t_serializable_object_to_blob(td.m_tx);
        wallet_rpc::transfer_details rpc_transfers;
        rpc_transfers.amount       = td.amount();
        rpc_transfers.spent        = td.m_spent;
        rpc_transfers.global_index = td.m_global_output_index;
        rpc_transfers.tx_hash      = boost::lexical_cast<std::string>(cryptonote::get_transaction_hash(td.m_tx));
        rpc_transfers.tx_size      = txBlob.size();
        res.transfers.push_back(rpc_transfers);
      }
    }

    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_query_key(const wallet_rpc::COMMAND_RPC_QUERY_KEY::request& req, wallet_rpc::COMMAND_RPC_QUERY_KEY::response& res, epee::json_rpc::error& er)
  {
      if (m_wallet.restricted())
      {
        er.code = WALLET_RPC_ERROR_CODE_DENIED;
        er.message = "Command unavailable in restricted mode.";
        return false;
      }

      if (req.key_type.compare("mnemonic") == 0)
      {
        if (!m_wallet.get_seed(res.key))
        {
            er.message = "The wallet is non-deterministic. Cannot display seed.";
            return false;
        }
      }
      else if(req.key_type.compare("view_key") == 0)
      {
          res.key = string_tools::pod_to_hex(m_wallet.get_account().get_keys().m_view_secret_key);
      }
      else
      {
          er.message = "key_type " + req.key_type + " not found";
          return false;
      }

      return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_rescan_blockchain(const wallet_rpc::COMMAND_RPC_RESCAN_BLOCKCHAIN::request& req, wallet_rpc::COMMAND_RPC_RESCAN_BLOCKCHAIN::response& res, epee::json_rpc::error& er)
  {
    if (m_wallet.restricted())
    {
      er.code = WALLET_RPC_ERROR_CODE_DENIED;
      er.message = "Command unavailable in restricted mode.";
      return false;
    }

    try
    {
      m_wallet.rescan_blockchain();
    }
    catch (std::exception& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = e.what();
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
  bool wallet_rpc_server::on_stop_wallet(const wallet_rpc::COMMAND_RPC_STOP_WALLET::request& req, wallet_rpc::COMMAND_RPC_STOP_WALLET::response& res, epee::json_rpc::error& er)
  {
    if (m_wallet.restricted())
    {
      er.code = WALLET_RPC_ERROR_CODE_DENIED;
      er.message = "Command unavailable in restricted mode.";
      return false;
    }

    try
    {
      m_wallet.store();
      m_stop.store(true, std::memory_order_relaxed);
    }
    catch (std::exception& e)
    {
      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
      er.message = e.what();
      return false;
    }
    return true;
  }
  //------------------------------------------------------------------------------------------------------------------------------
}