wallet-rpc: watch-only and cold wallet features added

- unsigned_txset, signed_txset in transfer / submit_transfer / sign_transfer
- export_outputs, import_outputs

Squashed commits:
[f4d9f3d4] wallet-rpc: do_not_relay removed from submit_transfer
[5b16a86f] wallet-rpc: review-fix - method signature changes, renaming
[b7fbb10a] wallet-rpc: naming fixes (unsigned vs signed), consts renamed
[8c7d2727] wallet-rpc: sign_transfer added
[481d024a] wallet2: sign_tx splitted to work with strings and structs, more granular
[2a474db9] wallet-rpc: wallet2::load_unsigned_tx split to load from str, file
[b1e3a018] wallet-rpc: review fix, load_tx_from_str variable rename
[1f6373be] wallet-rpc: review fix: save_tx_to_{str,file}
[2a08eafc] wallet-rpc: review comments fixes
- redundant this removed from wallet2.cpp
- load_tx_from_str, load_tx_from_file
[43498052] wallet-rpc: submit_transfer added
[9c45d1ad] wallet-rpc: watch_only check, return unsigned_txset
[62831396] wallet2: added string variants to load_tx, save_tx

- analogously to save_multisig_tx
- required for monero-wallet-rpc to support watch-only wallet

src/simplewallet/simplewallet.cpp

@@ -90,8 +90,6 @@ typedef cryptonote::simple_wallet sw;
 
 #define MIN_RING_SIZE 7 // Used to inform user about min ring size -- does not track actual protocol
 
-#define OUTPUT_EXPORT_FILE_MAGIC "Monero output export\003"
-
 #define LOCK_IDLE_SCOPE() \
   bool auto_refresh_enabled = m_auto_refresh_enabled.load(std::memory_order_relaxed); \
   m_auto_refresh_enabled.store(false, std::memory_order_relaxed); \
@@ -7182,19 +7180,8 @@ bool simple_wallet::export_outputs(const std::vector<std::string> &args)
   LOCK_IDLE_SCOPE();
   try
   {
-    std::vector<tools::wallet2::transfer_details> outs = m_wallet->export_outputs();
-
-    std::stringstream oss;
-    boost::archive::portable_binary_oarchive ar(oss);
-    ar << outs;
-
-    std::string magic(OUTPUT_EXPORT_FILE_MAGIC, strlen(OUTPUT_EXPORT_FILE_MAGIC));
-    const cryptonote::account_public_address &keys = m_wallet->get_account().get_keys().m_account_address;
-    std::string header;
-    header += std::string((const char *)&keys.m_spend_public_key, sizeof(crypto::public_key));
-    header += std::string((const char *)&keys.m_view_public_key, sizeof(crypto::public_key));
-    std::string ciphertext = m_wallet->encrypt_with_view_secret_key(header + oss.str());
-    bool r = epee::file_io_utils::save_string_to_file(filename, magic + ciphertext);
+    std::string data = m_wallet->export_outputs_to_str();
+    bool r = epee::file_io_utils::save_string_to_file(filename, data);
     if (!r)
     {
       fail_msg_writer() << tr("failed to save file ") << filename;
@@ -7233,63 +7220,16 @@ bool simple_wallet::import_outputs(const std::vector<std::string> &args)
     fail_msg_writer() << tr("failed to read file ") << filename;
     return true;
   }
-  const size_t magiclen = strlen(OUTPUT_EXPORT_FILE_MAGIC);
-  if (data.size() < magiclen || memcmp(data.data(), OUTPUT_EXPORT_FILE_MAGIC, magiclen))
-  {
-    fail_msg_writer() << "Bad output export file magic in " << filename;
-    return true;
-  }
-
-  try
-  {
-    data = m_wallet->decrypt_with_view_secret_key(std::string(data, magiclen));
-  }
-  catch (const std::exception &e)
-  {
-    fail_msg_writer() << "Failed to decrypt " << filename << ": " << e.what();
-    return true;
-  }
-
-  const size_t headerlen = 2 * sizeof(crypto::public_key);
-  if (data.size() < headerlen)
-  {
-    fail_msg_writer() << "Bad data size from file " << filename;
-    return true;
-  }
-  const crypto::public_key &public_spend_key = *(const crypto::public_key*)&data[0];
-  const crypto::public_key &public_view_key = *(const crypto::public_key*)&data[sizeof(crypto::public_key)];
-  const cryptonote::account_public_address &keys = m_wallet->get_account().get_keys().m_account_address;
-  if (public_spend_key != keys.m_spend_public_key || public_view_key != keys.m_view_public_key)
-  {
-    fail_msg_writer() << "Outputs from " << filename << " are for a different account";
-    return true;
-  }
 
   try
   {
-    std::string body(data, headerlen);
-    std::stringstream iss;
-    iss << body;
-    std::vector<tools::wallet2::transfer_details> outputs;
-    try
-    {
-      boost::archive::portable_binary_iarchive ar(iss);
-      ar >> outputs;
-    }
-    catch (...)
-    {
-      iss.str("");
-      iss << body;
-      boost::archive::binary_iarchive ar(iss);
-      ar >> outputs;
-    }
     LOCK_IDLE_SCOPE();
-    size_t n_outputs = m_wallet->import_outputs(outputs);
+    size_t n_outputs = m_wallet->import_outputs_from_str(data);
     success_msg_writer() << boost::lexical_cast<std::string>(n_outputs) << " outputs imported";
   }
   catch (const std::exception &e)
   {
-    fail_msg_writer() << "Failed to import outputs: " << e.what();
+    fail_msg_writer() << "Failed to import outputs " << filename << ": " << e.what();
     return true;
   }
 

src/wallet/wallet2.cpp

@@ -110,6 +110,8 @@ using namespace cryptonote;
 
 #define MULTISIG_EXPORT_FILE_MAGIC "Monero multisig export\001"
 
+#define OUTPUT_EXPORT_FILE_MAGIC "Monero output export\003"
+
 #define SEGREGATION_FORK_HEIGHT 1546000
 #define TESTNET_SEGREGATION_FORK_HEIGHT 1000000
 #define STAGENET_SEGREGATION_FORK_HEIGHT 1000000
@@ -4659,6 +4661,15 @@ void wallet2::commit_tx(std::vector<pending_tx>& ptx_vector)
 }
 //----------------------------------------------------------------------------------------------------
 bool wallet2::save_tx(const std::vector<pending_tx>& ptx_vector, const std::string &filename) const
+{
+  LOG_PRINT_L0("saving " << ptx_vector.size() << " transactions");
+  std::string ciphertext = dump_tx_to_str(ptx_vector);
+  if (ciphertext.empty())
+    return false;
+  return epee::file_io_utils::save_string_to_file(filename, ciphertext);
+}
+//----------------------------------------------------------------------------------------------------
+std::string wallet2::dump_tx_to_str(const std::vector<pending_tx> &ptx_vector) const
 {
   LOG_PRINT_L0("saving " << ptx_vector.size() << " transactions");
   unsigned_tx_set txs;
@@ -4680,11 +4691,11 @@ bool wallet2::save_tx(const std::vector<pending_tx>& ptx_vector, const std::stri
   }
   catch (...)
   {
-    return false;
+    return std::string();
   }
   LOG_PRINT_L2("Saving unsigned tx data: " << oss.str());
   std::string ciphertext = encrypt_with_view_secret_key(oss.str());
-  return epee::file_io_utils::save_string_to_file(filename, std::string(UNSIGNED_TX_PREFIX) + ciphertext);
+  return std::string(UNSIGNED_TX_PREFIX) + ciphertext;
 }
 //----------------------------------------------------------------------------------------------------
 bool wallet2::load_unsigned_tx(const std::string &unsigned_filename, unsigned_tx_set &exported_txs) const
@@ -4702,10 +4713,17 @@ bool wallet2::load_unsigned_tx(const std::string &unsigned_filename, unsigned_tx
     LOG_PRINT_L0("Failed to load from " << unsigned_filename);
     return false;
   }
+
+  return parse_unsigned_tx_from_str(s, exported_txs);
+}
+//----------------------------------------------------------------------------------------------------
+bool wallet2::parse_unsigned_tx_from_str(const std::string &unsigned_tx_st, unsigned_tx_set &exported_txs) const
+{
+  std::string s = unsigned_tx_st;
   const size_t magiclen = strlen(UNSIGNED_TX_PREFIX) - 1;
   if (strncmp(s.c_str(), UNSIGNED_TX_PREFIX, magiclen))
   {
-    LOG_PRINT_L0("Bad magic from " << unsigned_filename);
+    LOG_PRINT_L0("Bad magic from unsigned tx");
     return false;
   }
   s = s.substr(magiclen);
@@ -4721,7 +4739,7 @@ bool wallet2::load_unsigned_tx(const std::string &unsigned_filename, unsigned_tx
     }
     catch (...)
     {
-      LOG_PRINT_L0("Failed to parse data from " << unsigned_filename);
+      LOG_PRINT_L0("Failed to parse data from unsigned tx");
       return false;
     }
   }
@@ -4738,19 +4756,19 @@ bool wallet2::load_unsigned_tx(const std::string &unsigned_filename, unsigned_tx
       }
       catch (...)
       {
-        LOG_PRINT_L0("Failed to parse data from " << unsigned_filename);
+        LOG_PRINT_L0("Failed to parse data from unsigned tx");
         return false;
       }
     }
     catch (const std::exception &e)
     {
-      LOG_PRINT_L0("Failed to decrypt " << unsigned_filename << ": " << e.what());
+      LOG_PRINT_L0("Failed to decrypt unsigned tx: " << e.what());
       return false;
     }
   }
   else
   {
-    LOG_PRINT_L0("Unsupported version in " << unsigned_filename);
+    LOG_PRINT_L0("Unsupported version in unsigned tx");
     return false;
   }
   LOG_PRINT_L1("Loaded tx unsigned data from binary: " << exported_txs.txes.size() << " transactions");
@@ -4771,14 +4789,12 @@ bool wallet2::sign_tx(const std::string &unsigned_filename, const std::string &s
   }
   return sign_tx(exported_txs, signed_filename, txs, export_raw);
 }
-
 //----------------------------------------------------------------------------------------------------
-bool wallet2::sign_tx(unsigned_tx_set &exported_txs, const std::string &signed_filename, std::vector<wallet2::pending_tx> &txs, bool export_raw)
+bool wallet2::sign_tx(unsigned_tx_set &exported_txs, std::vector<wallet2::pending_tx> &txs, signed_tx_set &signed_txes)
 {
   import_outputs(exported_txs.transfers);
 
   // sign the transactions
-  signed_tx_set signed_txes;
   for (size_t n = 0; n < exported_txs.txes.size(); ++n)
   {
     tools::wallet2::tx_construction_data &sd = exported_txs.txes[n];
@@ -4840,19 +4856,20 @@ bool wallet2::sign_tx(unsigned_tx_set &exported_txs, const std::string &signed_f
     signed_txes.key_images[i] = m_transfers[i].m_key_image;
   }
 
-  // save as binary
-  std::ostringstream oss;
-  boost::archive::portable_binary_oarchive ar(oss);
-  try
-  {
-    ar << signed_txes;
-  }
-  catch(...)
+  return true;
+}
+//----------------------------------------------------------------------------------------------------
+bool wallet2::sign_tx(unsigned_tx_set &exported_txs, const std::string &signed_filename, std::vector<wallet2::pending_tx> &txs, bool export_raw)
+{
+  // sign the transactions
+  signed_tx_set signed_txes;
+  std::string ciphertext = sign_tx_dump_to_str(exported_txs, txs, signed_txes);
+  if (ciphertext.empty())
   {
+    LOG_PRINT_L0("Failed to sign unsigned_tx_set");
     return false;
   }
-  LOG_PRINT_L3("Saving signed tx data (with encryption): " << oss.str());
-  std::string ciphertext = encrypt_with_view_secret_key(oss.str());
+
   if (!epee::file_io_utils::save_string_to_file(signed_filename, std::string(SIGNED_TX_PREFIX) + ciphertext))
   {
     LOG_PRINT_L0("Failed to save file to " << signed_filename);
@@ -4875,6 +4892,32 @@ bool wallet2::sign_tx(unsigned_tx_set &exported_txs, const std::string &signed_f
   return true;
 }
 //----------------------------------------------------------------------------------------------------
+std::string wallet2::sign_tx_dump_to_str(unsigned_tx_set &exported_txs, std::vector<wallet2::pending_tx> &ptx, signed_tx_set &signed_txes)
+{
+  // sign the transactions
+  bool r = sign_tx(exported_txs, ptx, signed_txes);
+  if (!r)
+  {
+    LOG_PRINT_L0("Failed to sign unsigned_tx_set");
+    return std::string();
+  }
+
+  // save as binary
+  std::ostringstream oss;
+  boost::archive::portable_binary_oarchive ar(oss);
+  try
+  {
+    ar << signed_txes;
+  }
+  catch(...)
+  {
+    return std::string();
+  }
+  LOG_PRINT_L3("Saving signed tx data (with encryption): " << oss.str());
+  std::string ciphertext = encrypt_with_view_secret_key(oss.str());
+  return std::string(SIGNED_TX_PREFIX) + ciphertext;
+}
+//----------------------------------------------------------------------------------------------------
 bool wallet2::load_tx(const std::string &signed_filename, std::vector<tools::wallet2::pending_tx> &ptx, std::function<bool(const signed_tx_set&)> accept_func)
 {
   std::string s;
@@ -4892,10 +4935,20 @@ bool wallet2::load_tx(const std::string &signed_filename, std::vector<tools::wal
     LOG_PRINT_L0("Failed to load from " << signed_filename);
     return false;
   }
+
+  return parse_tx_from_str(s, ptx, accept_func);
+}
+//----------------------------------------------------------------------------------------------------
+bool wallet2::parse_tx_from_str(const std::string &signed_tx_st, std::vector<tools::wallet2::pending_tx> &ptx, std::function<bool(const signed_tx_set &)> accept_func)
+{
+  std::string s = signed_tx_st;
+  boost::system::error_code errcode;
+  signed_tx_set signed_txs;
+
   const size_t magiclen = strlen(SIGNED_TX_PREFIX) - 1;
   if (strncmp(s.c_str(), SIGNED_TX_PREFIX, magiclen))
   {
-    LOG_PRINT_L0("Bad magic from " << signed_filename);
+    LOG_PRINT_L0("Bad magic from signed transaction");
     return false;
   }
   s = s.substr(magiclen);
@@ -4911,7 +4964,7 @@ bool wallet2::load_tx(const std::string &signed_filename, std::vector<tools::wal
     }
     catch (...)
     {
-      LOG_PRINT_L0("Failed to parse data from " << signed_filename);
+      LOG_PRINT_L0("Failed to parse data from signed transaction");
       return false;
     }
   }
@@ -4928,23 +4981,23 @@ bool wallet2::load_tx(const std::string &signed_filename, std::vector<tools::wal
       }
       catch (...)
       {
-        LOG_PRINT_L0("Failed to parse decrypted data from " << signed_filename);
+        LOG_PRINT_L0("Failed to parse decrypted data from signed transaction");
         return false;
       }
     }
     catch (const std::exception &e)
     {
-      LOG_PRINT_L0("Failed to decrypt " << signed_filename << ": " << e.what());
+      LOG_PRINT_L0("Failed to decrypt signed transaction: " << e.what());
       return false;
     }
   }
   else
   {
-    LOG_PRINT_L0("Unsupported version in " << signed_filename);
+    LOG_PRINT_L0("Unsupported version in signed transaction");
     return false;
   }
   LOG_PRINT_L0("Loaded signed tx data from binary: " << signed_txs.ptx.size() << " transactions");
-  for (auto &ptx: signed_txs.ptx) LOG_PRINT_L0(cryptonote::obj_to_json_str(ptx.tx));
+  for (auto &c_ptx: signed_txs.ptx) LOG_PRINT_L0(cryptonote::obj_to_json_str(c_ptx.tx));
 
   if (accept_func && !accept_func(signed_txs))
   {
@@ -9772,6 +9825,23 @@ std::vector<tools::wallet2::transfer_details> wallet2::export_outputs() const
   return outs;
 }
 //----------------------------------------------------------------------------------------------------
+std::string wallet2::export_outputs_to_str() const
+{
+  std::vector<tools::wallet2::transfer_details> outs = export_outputs();
+
+  std::stringstream oss;
+  boost::archive::portable_binary_oarchive ar(oss);
+  ar << outs;
+
+  std::string magic(OUTPUT_EXPORT_FILE_MAGIC, strlen(OUTPUT_EXPORT_FILE_MAGIC));
+  const cryptonote::account_public_address &keys = get_account().get_keys().m_account_address;
+  std::string header;
+  header += std::string((const char *)&keys.m_spend_public_key, sizeof(crypto::public_key));
+  header += std::string((const char *)&keys.m_view_public_key, sizeof(crypto::public_key));
+  std::string ciphertext = encrypt_with_view_secret_key(header + oss.str());
+  return magic + ciphertext;
+}
+//----------------------------------------------------------------------------------------------------
 size_t wallet2::import_outputs(const std::vector<tools::wallet2::transfer_details> &outputs)
 {
   m_transfers.clear();
@@ -9804,6 +9874,67 @@ size_t wallet2::import_outputs(const std::vector<tools::wallet2::transfer_detail
   return m_transfers.size();
 }
 //----------------------------------------------------------------------------------------------------
+size_t wallet2::import_outputs_from_str(const std::string &outputs_st)
+{
+  std::string data = outputs_st;
+  const size_t magiclen = strlen(OUTPUT_EXPORT_FILE_MAGIC);
+  if (data.size() < magiclen || memcmp(data.data(), OUTPUT_EXPORT_FILE_MAGIC, magiclen))
+  {
+    THROW_WALLET_EXCEPTION(error::wallet_internal_error, std::string("Bad magic from outputs"));
+  }
+
+  try
+  {
+    data = decrypt_with_view_secret_key(std::string(data, magiclen));
+  }
+  catch (const std::exception &e)
+  {
+    THROW_WALLET_EXCEPTION(error::wallet_internal_error, std::string("Failed to decrypt outputs: ") + e.what());
+  }
+
+  const size_t headerlen = 2 * sizeof(crypto::public_key);
+  if (data.size() < headerlen)
+  {
+    THROW_WALLET_EXCEPTION(error::wallet_internal_error, std::string("Bad data size for outputs"));
+  }
+  const crypto::public_key &public_spend_key = *(const crypto::public_key*)&data[0];
+  const crypto::public_key &public_view_key = *(const crypto::public_key*)&data[sizeof(crypto::public_key)];
+  const cryptonote::account_public_address &keys = get_account().get_keys().m_account_address;
+  if (public_spend_key != keys.m_spend_public_key || public_view_key != keys.m_view_public_key)
+  {
+    THROW_WALLET_EXCEPTION(error::wallet_internal_error, std::string("Outputs from are for a different account"));
+  }
+
+  size_t imported_outputs = 0;
+  try
+  {
+    std::string body(data, headerlen);
+    std::stringstream iss;
+    iss << body;
+    std::vector<tools::wallet2::transfer_details> outputs;
+    try
+    {
+      boost::archive::portable_binary_iarchive ar(iss);
+      ar >> outputs;
+    }
+    catch (...)
+    {
+      iss.str("");
+      iss << body;
+      boost::archive::binary_iarchive ar(iss);
+      ar >> outputs;
+    }
+
+    imported_outputs = import_outputs(outputs);
+  }
+  catch (const std::exception &e)
+  {
+    THROW_WALLET_EXCEPTION(error::wallet_internal_error, std::string("Failed to import outputs") + e.what());
+  }
+
+  return imported_outputs;
+}
+//----------------------------------------------------------------------------------------------------
 crypto::public_key wallet2::get_multisig_signer_public_key(const crypto::secret_key &spend_skey) const
 {
   crypto::public_key pkey;

src/wallet/wallet2.h

@@ -684,6 +684,7 @@ namespace tools
     void commit_tx(pending_tx& ptx_vector);
     void commit_tx(std::vector<pending_tx>& ptx_vector);
     bool save_tx(const std::vector<pending_tx>& ptx_vector, const std::string &filename) const;
+    std::string dump_tx_to_str(const std::vector<pending_tx> &ptx_vector) const;
     std::string save_multisig_tx(multisig_tx_set txs);
     bool save_multisig_tx(const multisig_tx_set &txs, const std::string &filename);
     std::string save_multisig_tx(const std::vector<pending_tx>& ptx_vector);
@@ -692,9 +693,13 @@ namespace tools
     bool sign_tx(const std::string &unsigned_filename, const std::string &signed_filename, std::vector<wallet2::pending_tx> &ptx, std::function<bool(const unsigned_tx_set&)> accept_func = NULL, bool export_raw = false);
     // sign unsigned tx. Takes unsigned_tx_set as argument. Used by GUI
     bool sign_tx(unsigned_tx_set &exported_txs, const std::string &signed_filename, std::vector<wallet2::pending_tx> &ptx, bool export_raw = false);
+    bool sign_tx(unsigned_tx_set &exported_txs, std::vector<wallet2::pending_tx> &ptx, signed_tx_set &signed_txs);
+    std::string sign_tx_dump_to_str(unsigned_tx_set &exported_txs, std::vector<wallet2::pending_tx> &ptx, signed_tx_set &signed_txes);
     // load unsigned_tx_set from file. 
     bool load_unsigned_tx(const std::string &unsigned_filename, unsigned_tx_set &exported_txs) const;
+    bool parse_unsigned_tx_from_str(const std::string &unsigned_tx_st, unsigned_tx_set &exported_txs) const;
     bool load_tx(const std::string &signed_filename, std::vector<tools::wallet2::pending_tx> &ptx, std::function<bool(const signed_tx_set&)> accept_func = NULL);
+    bool parse_tx_from_str(const std::string &signed_tx_st, std::vector<tools::wallet2::pending_tx> &ptx, std::function<bool(const signed_tx_set &)> accept_func);
     std::vector<pending_tx> create_transactions(std::vector<cryptonote::tx_destination_entry> dsts, const size_t fake_outs_count, const uint64_t unlock_time, uint32_t priority, const std::vector<uint8_t>& extra, bool trusted_daemon);
     std::vector<wallet2::pending_tx> create_transactions_2(std::vector<cryptonote::tx_destination_entry> dsts, const size_t fake_outs_count, const uint64_t unlock_time, uint32_t priority, const std::vector<uint8_t>& extra, uint32_t subaddr_account, std::set<uint32_t> subaddr_indices, bool trusted_daemon);     // pass subaddr_indices by value on purpose
     std::vector<wallet2::pending_tx> create_transactions_all(uint64_t below, const cryptonote::account_public_address &address, bool is_subaddress, const size_t fake_outs_count, const uint64_t unlock_time, uint32_t priority, const std::vector<uint8_t>& extra, uint32_t subaddr_account, std::set<uint32_t> subaddr_indices, bool trusted_daemon);
@@ -970,7 +975,9 @@ namespace tools
 
     // Import/Export wallet data
     std::vector<tools::wallet2::transfer_details> export_outputs() const;
+    std::string export_outputs_to_str() const;
     size_t import_outputs(const std::vector<tools::wallet2::transfer_details> &outputs);
+    size_t import_outputs_from_str(const std::string &outputs_st);
     payment_container export_payments() const;
     void import_payments(const payment_container &payments);
     void import_payments_out(const std::list<std::pair<crypto::hash,wallet2::confirmed_transfer_details>> &confirmed_payments);

src/wallet/wallet_rpc_server.cpp

@@ -712,7 +712,7 @@ namespace tools
   //------------------------------------------------------------------------------------------------------------------------------
   template<typename Ts, typename Tu>
   bool wallet_rpc_server::fill_response(std::vector<tools::wallet2::pending_tx> &ptx_vector,
-      bool get_tx_key, Ts& tx_key, Tu &amount, Tu &fee, std::string &multisig_txset, bool do_not_relay,
+      bool get_tx_key, Ts& tx_key, Tu &amount, Tu &fee, std::string &multisig_txset, std::string &unsigned_txset, bool do_not_relay,
       Ts &tx_hash, bool get_tx_hex, Ts &tx_blob, bool get_tx_metadata, Ts &tx_metadata, epee::json_rpc::error &er)
   {
     for (const auto & ptx : ptx_vector)
@@ -741,7 +741,16 @@ namespace tools
     }
     else
     {
-      if (!do_not_relay)
+      if (m_wallet->watch_only()){
+        unsigned_txset = epee::string_tools::buff_to_hex_nodelimer(m_wallet->dump_tx_to_str(ptx_vector));
+        if (unsigned_txset.empty())
+        {
+          er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
+          er.message = "Failed to save unsigned tx set after creation";
+          return false;
+        }
+      }
+      else if (!do_not_relay)
         m_wallet->commit_tx(ptx_vector);
 
       // populate response with tx hashes
@@ -811,7 +820,7 @@ namespace tools
         return false;
       }
 
-      return fill_response(ptx_vector, req.get_tx_key, res.tx_key, res.amount, res.fee, res.multisig_txset, req.do_not_relay,
+      return fill_response(ptx_vector, req.get_tx_key, res.tx_key, res.amount, res.fee, res.multisig_txset, res.unsigned_txset, req.do_not_relay,
           res.tx_hash, req.get_tx_hex, res.tx_blob, req.get_tx_metadata, res.tx_metadata, er);
     }
     catch (const std::exception& e)
@@ -858,7 +867,7 @@ namespace tools
       std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_2(dsts, mixin, req.unlock_time, priority, extra, req.account_index, req.subaddr_indices, m_trusted_daemon);
       LOG_PRINT_L2("on_transfer_split called create_transactions_2");
 
-      return fill_response(ptx_vector, req.get_tx_keys, res.tx_key_list, res.amount_list, res.fee_list, res.multisig_txset, req.do_not_relay,
+      return fill_response(ptx_vector, req.get_tx_keys, res.tx_key_list, res.amount_list, res.fee_list, res.multisig_txset, res.unsigned_txset, req.do_not_relay,
           res.tx_hash_list, req.get_tx_hex, res.tx_blob_list, req.get_tx_metadata, res.tx_metadata_list, er);
     }
     catch (const std::exception& e)
@@ -869,6 +878,141 @@ namespace tools
     return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------
+  bool wallet_rpc_server::on_sign_transfer(const wallet_rpc::COMMAND_RPC_SIGN_TRANSFER::request& req, wallet_rpc::COMMAND_RPC_SIGN_TRANSFER::response& res, epee::json_rpc::error& er)
+  {
+    if (!m_wallet) return not_open(er);
+    if (m_wallet->restricted())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_DENIED;
+      er.message = "Command unavailable in restricted mode.";
+      return false;
+    }
+    if (m_wallet->key_on_device())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
+      er.message = "command not supported by HW wallet";
+      return false;
+    }
+    if(m_wallet->watch_only())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_WATCH_ONLY;
+      er.message = "command not supported by watch-only wallet";
+      return false;
+    }
+
+    cryptonote::blobdata blob;
+    if (!epee::string_tools::parse_hexstr_to_binbuff(req.unsigned_txset, blob))
+    {
+      er.code = WALLET_RPC_ERROR_CODE_BAD_HEX;
+      er.message = "Failed to parse hex.";
+      return false;
+    }
+
+    tools::wallet2::unsigned_tx_set exported_txs;
+    if(!m_wallet->parse_unsigned_tx_from_str(blob, exported_txs))
+    {
+      er.code = WALLET_RPC_ERROR_CODE_BAD_UNSIGNED_TX_DATA;
+      er.message = "cannot load unsigned_txset";
+      return false;
+    }
+
+    std::vector<tools::wallet2::pending_tx> ptxs;
+    try
+    {
+      tools::wallet2::signed_tx_set signed_txs;
+      std::string ciphertext = m_wallet->sign_tx_dump_to_str(exported_txs, ptxs, signed_txs);
+      if (ciphertext.empty())
+      {
+        er.code = WALLET_RPC_ERROR_CODE_SIGN_UNSIGNED;
+        er.message = "Failed to sign unsigned tx";
+        return false;
+      }
+
+      res.signed_txset = epee::string_tools::buff_to_hex_nodelimer(ciphertext);
+    }
+    catch (const std::exception &e)
+    {
+      er.code = WALLET_RPC_ERROR_CODE_SIGN_UNSIGNED;
+      er.message = std::string("Failed to sign unsigned tx: ") + e.what();
+      return false;
+    }
+
+    for (auto &ptx: ptxs)
+    {
+      res.tx_hash_list.push_back(epee::string_tools::pod_to_hex(cryptonote::get_transaction_hash(ptx.tx)));
+    }
+
+    if (req.export_raw)
+    {
+      for (auto &ptx: ptxs)
+      {
+        res.tx_raw_list.push_back(epee::string_tools::buff_to_hex_nodelimer(cryptonote::tx_to_blob(ptx.tx)));
+      }
+    }
+
+    return true;
+  }
+  //------------------------------------------------------------------------------------------------------------------------------
+  bool wallet_rpc_server::on_submit_transfer(const wallet_rpc::COMMAND_RPC_SUBMIT_TRANSFER::request& req, wallet_rpc::COMMAND_RPC_SUBMIT_TRANSFER::response& res, epee::json_rpc::error& er)
+  {
+    if (!m_wallet) return not_open(er);
+    if (m_wallet->restricted())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_DENIED;
+      er.message = "Command unavailable in restricted mode.";
+      return false;
+    }
+    if (m_wallet->key_on_device())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
+      er.message = "command not supported by HW wallet";
+      return false;
+    }
+
+    cryptonote::blobdata blob;
+    if (!epee::string_tools::parse_hexstr_to_binbuff(req.tx_data_hex, blob))
+    {
+      er.code = WALLET_RPC_ERROR_CODE_BAD_HEX;
+      er.message = "Failed to parse hex.";
+      return false;
+    }
+
+    std::vector<tools::wallet2::pending_tx> ptx_vector;
+    try
+    {
+      bool r = m_wallet->parse_tx_from_str(blob, ptx_vector, NULL);
+      if (!r)
+      {
+        er.code = WALLET_RPC_ERROR_CODE_BAD_SIGNED_TX_DATA;
+        er.message = "Failed to parse signed tx data.";
+        return false;
+      }
+    }
+    catch (const std::exception &e)
+    {
+      er.code = WALLET_RPC_ERROR_CODE_BAD_SIGNED_TX_DATA;
+      er.message = std::string("Failed to parse signed tx: ") + e.what();
+      return false;
+    }
+
+    try
+    {
+      for (auto &ptx: ptx_vector)
+      {
+        m_wallet->commit_tx(ptx);
+        res.tx_hash_list.push_back(epee::string_tools::pod_to_hex(cryptonote::get_transaction_hash(ptx.tx)));
+      }
+    }
+    catch (const std::exception &e)
+    {
+      er.code = WALLET_RPC_ERROR_CODE_SIGNED_SUBMISSION;
+      er.message = std::string("Failed to submit signed tx: ") + e.what();
+      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) return not_open(er);
@@ -883,7 +1027,7 @@ namespace tools
     {
       std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_unmixable_sweep_transactions(m_trusted_daemon);
 
-      return fill_response(ptx_vector, req.get_tx_keys, res.tx_key_list, res.amount_list, res.fee_list, res.multisig_txset, req.do_not_relay,
+      return fill_response(ptx_vector, req.get_tx_keys, res.tx_key_list, res.amount_list, res.fee_list, res.multisig_txset, res.unsigned_txset, req.do_not_relay,
           res.tx_hash_list, req.get_tx_hex, res.tx_blob_list, req.get_tx_metadata, res.tx_metadata_list, er);
     }
     catch (const std::exception& e)
@@ -931,7 +1075,7 @@ namespace tools
       uint32_t priority = m_wallet->adjust_priority(req.priority);
       std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_all(req.below_amount, dsts[0].addr, dsts[0].is_subaddress, mixin, req.unlock_time, priority, extra, req.account_index, req.subaddr_indices, m_trusted_daemon);
 
-      return fill_response(ptx_vector, req.get_tx_keys, res.tx_key_list, res.amount_list, res.fee_list, res.multisig_txset, req.do_not_relay,
+      return fill_response(ptx_vector, req.get_tx_keys, res.tx_key_list, res.amount_list, res.fee_list, res.multisig_txset, res.unsigned_txset, req.do_not_relay,
           res.tx_hash_list, req.get_tx_hex, res.tx_blob_list, req.get_tx_metadata, res.tx_metadata_list, er);
     }
     catch (const std::exception& e)
@@ -1007,7 +1151,7 @@ namespace tools
         return false;
       }
 
-      return fill_response(ptx_vector, req.get_tx_key, res.tx_key, res.amount, res.fee, res.multisig_txset, req.do_not_relay,
+      return fill_response(ptx_vector, req.get_tx_key, res.tx_key, res.amount, res.fee, res.multisig_txset, res.unsigned_txset, req.do_not_relay,
           res.tx_hash, req.get_tx_hex, res.tx_blob, req.get_tx_metadata, res.tx_metadata, er);
     }
     catch (const std::exception& e)
@@ -1974,6 +2118,72 @@ namespace tools
     return false;
   }
   //------------------------------------------------------------------------------------------------------------------------------
+  bool wallet_rpc_server::on_export_outputs(const wallet_rpc::COMMAND_RPC_EXPORT_OUTPUTS::request& req, wallet_rpc::COMMAND_RPC_EXPORT_OUTPUTS::response& res, epee::json_rpc::error& er)
+  {
+    if (!m_wallet) return not_open(er);
+    if (m_wallet->restricted())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_DENIED;
+      er.message = "Command unavailable in restricted mode.";
+      return false;
+    }
+    if (m_wallet->key_on_device())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
+      er.message = "command not supported by HW wallet";
+      return false;
+    }
+
+    try
+    {
+      res.outputs_data_hex = epee::string_tools::buff_to_hex_nodelimer(m_wallet->export_outputs_to_str());
+    }
+    catch (const std::exception &e)
+    {
+      handle_rpc_exception(std::current_exception(), er, WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR);
+      return false;
+    }
+
+    return true;
+  }
+  //------------------------------------------------------------------------------------------------------------------------------
+  bool wallet_rpc_server::on_import_outputs(const wallet_rpc::COMMAND_RPC_IMPORT_OUTPUTS::request& req, wallet_rpc::COMMAND_RPC_IMPORT_OUTPUTS::response& res, epee::json_rpc::error& er)
+  {
+    if (!m_wallet) return not_open(er);
+    if (m_wallet->restricted())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_DENIED;
+      er.message = "Command unavailable in restricted mode.";
+      return false;
+    }
+    if (m_wallet->key_on_device())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
+      er.message = "command not supported by HW wallet";
+      return false;
+    }
+
+    cryptonote::blobdata blob;
+    if (!epee::string_tools::parse_hexstr_to_binbuff(req.outputs_data_hex, blob))
+    {
+      er.code = WALLET_RPC_ERROR_CODE_BAD_HEX;
+      er.message = "Failed to parse hex.";
+      return false;
+    }
+
+    try
+    {
+      res.num_imported = m_wallet->import_outputs_from_str(blob);
+    }
+    catch (const std::exception &e)
+    {
+      handle_rpc_exception(std::current_exception(), er, WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR);
+      return false;
+    }
+
+    return true;
+  }
+  //------------------------------------------------------------------------------------------------------------------------------
   bool wallet_rpc_server::on_export_key_images(const wallet_rpc::COMMAND_RPC_EXPORT_KEY_IMAGES::request& req, wallet_rpc::COMMAND_RPC_EXPORT_KEY_IMAGES::response& res, epee::json_rpc::error& er)
   {
     if (!m_wallet) return not_open(er);

src/wallet/wallet_rpc_server.h

@@ -84,6 +84,8 @@ namespace tools
         MAP_JON_RPC_WE("getheight",          on_getheight,          wallet_rpc::COMMAND_RPC_GET_HEIGHT)
         MAP_JON_RPC_WE("transfer",           on_transfer,           wallet_rpc::COMMAND_RPC_TRANSFER)
         MAP_JON_RPC_WE("transfer_split",     on_transfer_split,     wallet_rpc::COMMAND_RPC_TRANSFER_SPLIT)
+        MAP_JON_RPC_WE("sign_transfer",      on_sign_transfer,      wallet_rpc::COMMAND_RPC_SIGN_TRANSFER)
+        MAP_JON_RPC_WE("submit_transfer",    on_submit_transfer,    wallet_rpc::COMMAND_RPC_SUBMIT_TRANSFER)
         MAP_JON_RPC_WE("sweep_dust",         on_sweep_dust,         wallet_rpc::COMMAND_RPC_SWEEP_DUST)
         MAP_JON_RPC_WE("sweep_unmixable",    on_sweep_dust,         wallet_rpc::COMMAND_RPC_SWEEP_DUST)
         MAP_JON_RPC_WE("sweep_all",          on_sweep_all,          wallet_rpc::COMMAND_RPC_SWEEP_ALL)
@@ -114,6 +116,8 @@ namespace tools
         MAP_JON_RPC_WE("get_transfer_by_txid", on_get_transfer_by_txid, wallet_rpc::COMMAND_RPC_GET_TRANSFER_BY_TXID)
         MAP_JON_RPC_WE("sign",               on_sign,               wallet_rpc::COMMAND_RPC_SIGN)
         MAP_JON_RPC_WE("verify",             on_verify,             wallet_rpc::COMMAND_RPC_VERIFY)
+        MAP_JON_RPC_WE("export_outputs",     on_export_outputs,     wallet_rpc::COMMAND_RPC_EXPORT_OUTPUTS)
+        MAP_JON_RPC_WE("import_outputs",     on_import_outputs,     wallet_rpc::COMMAND_RPC_IMPORT_OUTPUTS)
         MAP_JON_RPC_WE("export_key_images",  on_export_key_images,  wallet_rpc::COMMAND_RPC_EXPORT_KEY_IMAGES)
         MAP_JON_RPC_WE("import_key_images",  on_import_key_images,  wallet_rpc::COMMAND_RPC_IMPORT_KEY_IMAGES)
         MAP_JON_RPC_WE("make_uri",           on_make_uri,           wallet_rpc::COMMAND_RPC_MAKE_URI)
@@ -154,6 +158,8 @@ namespace tools
       bool validate_transfer(const std::list<wallet_rpc::transfer_destination>& destinations, const std::string& payment_id, std::vector<cryptonote::tx_destination_entry>& dsts, std::vector<uint8_t>& extra, bool at_least_one_destination, epee::json_rpc::error& er);
       bool on_transfer(const wallet_rpc::COMMAND_RPC_TRANSFER::request& req, wallet_rpc::COMMAND_RPC_TRANSFER::response& res, epee::json_rpc::error& er);
       bool 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);
+      bool on_sign_transfer(const wallet_rpc::COMMAND_RPC_SIGN_TRANSFER::request& req, wallet_rpc::COMMAND_RPC_SIGN_TRANSFER::response& res, epee::json_rpc::error& er);
+      bool on_submit_transfer(const wallet_rpc::COMMAND_RPC_SUBMIT_TRANSFER::request& req, wallet_rpc::COMMAND_RPC_SUBMIT_TRANSFER::response& res, epee::json_rpc::error& er);
       bool 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);
       bool on_sweep_all(const wallet_rpc::COMMAND_RPC_SWEEP_ALL::request& req, wallet_rpc::COMMAND_RPC_SWEEP_ALL::response& res, epee::json_rpc::error& er);
       bool on_sweep_single(const wallet_rpc::COMMAND_RPC_SWEEP_SINGLE::request& req, wallet_rpc::COMMAND_RPC_SWEEP_SINGLE::response& res, epee::json_rpc::error& er);
@@ -182,6 +188,8 @@ namespace tools
       bool on_get_transfer_by_txid(const wallet_rpc::COMMAND_RPC_GET_TRANSFER_BY_TXID::request& req, wallet_rpc::COMMAND_RPC_GET_TRANSFER_BY_TXID::response& res, epee::json_rpc::error& er);
       bool on_sign(const wallet_rpc::COMMAND_RPC_SIGN::request& req, wallet_rpc::COMMAND_RPC_SIGN::response& res, epee::json_rpc::error& er);
       bool on_verify(const wallet_rpc::COMMAND_RPC_VERIFY::request& req, wallet_rpc::COMMAND_RPC_VERIFY::response& res, epee::json_rpc::error& er);
+      bool on_export_outputs(const wallet_rpc::COMMAND_RPC_EXPORT_OUTPUTS::request& req, wallet_rpc::COMMAND_RPC_EXPORT_OUTPUTS::response& res, epee::json_rpc::error& er);
+      bool on_import_outputs(const wallet_rpc::COMMAND_RPC_IMPORT_OUTPUTS::request& req, wallet_rpc::COMMAND_RPC_IMPORT_OUTPUTS::response& res, epee::json_rpc::error& er);
       bool on_export_key_images(const wallet_rpc::COMMAND_RPC_EXPORT_KEY_IMAGES::request& req, wallet_rpc::COMMAND_RPC_EXPORT_KEY_IMAGES::response& res, epee::json_rpc::error& er);
       bool on_import_key_images(const wallet_rpc::COMMAND_RPC_IMPORT_KEY_IMAGES::request& req, wallet_rpc::COMMAND_RPC_IMPORT_KEY_IMAGES::response& res, epee::json_rpc::error& er);
       bool on_make_uri(const wallet_rpc::COMMAND_RPC_MAKE_URI::request& req, wallet_rpc::COMMAND_RPC_MAKE_URI::response& res, epee::json_rpc::error& er);
@@ -217,7 +225,7 @@ namespace tools
 
       template<typename Ts, typename Tu>
       bool fill_response(std::vector<tools::wallet2::pending_tx> &ptx_vector,
-          bool get_tx_key, Ts& tx_key, Tu &amount, Tu &fee, std::string &multisig_txset, bool do_not_relay,
+          bool get_tx_key, Ts& tx_key, Tu &amount, Tu &fee, std::string &multisig_txset, std::string &unsigned_txset, bool do_not_relay,
           Ts &tx_hash, bool get_tx_hex, Ts &tx_blob, bool get_tx_metadata, Ts &tx_metadata, epee::json_rpc::error &er);
 
       wallet2 *m_wallet;

src/wallet/wallet_rpc_server_commands_defs.h

@@ -419,6 +419,7 @@ namespace wallet_rpc
       std::string tx_blob;
       std::string tx_metadata;
       std::string multisig_txset;
+      std::string unsigned_txset;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(tx_hash)
@@ -429,6 +430,7 @@ namespace wallet_rpc
         KV_SERIALIZE(tx_blob)
         KV_SERIALIZE(tx_metadata)
         KV_SERIALIZE(multisig_txset)
+        KV_SERIALIZE(unsigned_txset)
       END_KV_SERIALIZE_MAP()
     };
   };
@@ -484,6 +486,7 @@ namespace wallet_rpc
       std::list<std::string> tx_blob_list;
       std::list<std::string> tx_metadata_list;
       std::string multisig_txset;
+      std::string unsigned_txset;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(tx_hash_list)
@@ -493,6 +496,55 @@ namespace wallet_rpc
         KV_SERIALIZE(tx_blob_list)
         KV_SERIALIZE(tx_metadata_list)
         KV_SERIALIZE(multisig_txset)
+        KV_SERIALIZE(unsigned_txset)
+      END_KV_SERIALIZE_MAP()
+    };
+  };
+
+  struct COMMAND_RPC_SIGN_TRANSFER
+  {
+    struct request
+    {
+      std::string unsigned_txset;
+      bool export_raw;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(unsigned_txset)
+        KV_SERIALIZE_OPT(export_raw, false)
+      END_KV_SERIALIZE_MAP()
+    };
+
+    struct response
+    {
+      std::string signed_txset;
+      std::list<std::string> tx_hash_list;
+      std::list<std::string> tx_raw_list;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(signed_txset)
+        KV_SERIALIZE(tx_hash_list)
+        KV_SERIALIZE(tx_raw_list)
+      END_KV_SERIALIZE_MAP()
+    };
+  };
+
+  struct COMMAND_RPC_SUBMIT_TRANSFER
+  {
+    struct request
+    {
+      std::string tx_data_hex;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(tx_data_hex)
+      END_KV_SERIALIZE_MAP()
+    };
+
+    struct response
+    {
+      std::list<std::string> tx_hash_list;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(tx_hash_list)
       END_KV_SERIALIZE_MAP()
     };
   };
@@ -532,6 +584,7 @@ namespace wallet_rpc
       std::list<std::string> tx_blob_list;
       std::list<std::string> tx_metadata_list;
       std::string multisig_txset;
+      std::string unsigned_txset;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(tx_hash_list)
@@ -541,6 +594,7 @@ namespace wallet_rpc
         KV_SERIALIZE(tx_blob_list)
         KV_SERIALIZE(tx_metadata_list)
         KV_SERIALIZE(multisig_txset)
+        KV_SERIALIZE(unsigned_txset)
       END_KV_SERIALIZE_MAP()
     };
   };
@@ -598,6 +652,7 @@ namespace wallet_rpc
       std::list<std::string> tx_blob_list;
       std::list<std::string> tx_metadata_list;
       std::string multisig_txset;
+      std::string unsigned_txset;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(tx_hash_list)
@@ -607,6 +662,7 @@ namespace wallet_rpc
         KV_SERIALIZE(tx_blob_list)
         KV_SERIALIZE(tx_metadata_list)
         KV_SERIALIZE(multisig_txset)
+        KV_SERIALIZE(unsigned_txset)
       END_KV_SERIALIZE_MAP()
     };
   };
@@ -651,6 +707,7 @@ namespace wallet_rpc
       std::string tx_blob;
       std::string tx_metadata;
       std::string multisig_txset;
+      std::string unsigned_txset;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(tx_hash)
@@ -660,6 +717,7 @@ namespace wallet_rpc
         KV_SERIALIZE(tx_blob)
         KV_SERIALIZE(tx_metadata)
         KV_SERIALIZE(multisig_txset)
+        KV_SERIALIZE(unsigned_txset)
       END_KV_SERIALIZE_MAP()
     };
   };
@@ -1364,6 +1422,45 @@ namespace wallet_rpc
     };
   };
 
+  struct COMMAND_RPC_EXPORT_OUTPUTS
+  {
+    struct request
+    {
+      BEGIN_KV_SERIALIZE_MAP()
+      END_KV_SERIALIZE_MAP()
+    };
+
+    struct response
+    {
+      std::string outputs_data_hex;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(outputs_data_hex);
+      END_KV_SERIALIZE_MAP()
+    };
+  };
+
+  struct COMMAND_RPC_IMPORT_OUTPUTS
+  {
+    struct request
+    {
+      std::string outputs_data_hex;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(outputs_data_hex);
+      END_KV_SERIALIZE_MAP()
+    };
+
+    struct response
+    {
+      uint64_t num_imported;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(num_imported);
+      END_KV_SERIALIZE_MAP()
+    };
+  };
+
   struct COMMAND_RPC_EXPORT_KEY_IMAGES
   {
     struct request

src/wallet/wallet_rpc_server_error_codes.h

@@ -69,3 +69,7 @@
 #define WALLET_RPC_ERROR_CODE_MULTISIG_SUBMISSION    -36
 #define WALLET_RPC_ERROR_CODE_NOT_ENOUGH_UNLOCKED_MONEY -37
 #define WALLET_RPC_ERROR_CODE_NO_DAEMON_CONNECTION   -38
+#define WALLET_RPC_ERROR_CODE_BAD_UNSIGNED_TX_DATA   -39
+#define WALLET_RPC_ERROR_CODE_BAD_SIGNED_TX_DATA     -40
+#define WALLET_RPC_ERROR_CODE_SIGNED_SUBMISSION      -41
+#define WALLET_RPC_ERROR_CODE_SIGN_UNSIGNED          -42