wallet: only return tx keys via RPC if requested

To get the tx keys returned via RPC, set the "get_tx_key" or
"get_tx_keys" request field to true (defaults to false).

src/cryptonote_core/cryptonote_format_utils.cpp

@@ -408,7 +408,7 @@ namespace cryptonote
     return encrypt_payment_id(payment_id, public_key, secret_key);
   }
   //---------------------------------------------------------------
-  bool construct_tx(const account_keys& sender_account_keys, const std::vector<tx_source_entry>& sources, const std::vector<tx_destination_entry>& destinations, std::vector<uint8_t> extra, transaction& tx, uint64_t unlock_time, crypto::secret_key &tx_key)
+  bool construct_tx_and_get_tx_key(const account_keys& sender_account_keys, const std::vector<tx_source_entry>& sources, const std::vector<tx_destination_entry>& destinations, std::vector<uint8_t> extra, transaction& tx, uint64_t unlock_time, crypto::secret_key &tx_key)
   {
     tx.vin.clear();
     tx.vout.clear();
@@ -578,6 +578,12 @@ namespace cryptonote
     return true;
   }
   //---------------------------------------------------------------
+  bool construct_tx(const account_keys& sender_account_keys, const std::vector<tx_source_entry>& sources, const std::vector<tx_destination_entry>& destinations, std::vector<uint8_t> extra, transaction& tx, uint64_t unlock_time)
+  {
+     crypto::secret_key tx_key;
+     return construct_tx_and_get_tx_key(sender_account_keys, sources, destinations, extra, tx, unlock_time, tx_key);
+  }
+  //---------------------------------------------------------------
   bool get_inputs_money_amount(const transaction& tx, uint64_t& money)
   {
     money = 0;

src/cryptonote_core/cryptonote_format_utils.h

@@ -69,7 +69,8 @@ namespace cryptonote
   };
 
   //---------------------------------------------------------------
-  bool construct_tx(const account_keys& sender_account_keys, const std::vector<tx_source_entry>& sources, const std::vector<tx_destination_entry>& destinations, std::vector<uint8_t> extra, transaction& tx, uint64_t unlock_time, crypto::secret_key &txkey);
+  bool construct_tx(const account_keys& sender_account_keys, const std::vector<tx_source_entry>& sources, const std::vector<tx_destination_entry>& destinations, std::vector<uint8_t> extra, transaction& tx, uint64_t unlock_time);
+  bool construct_tx_and_get_tx_key(const account_keys& sender_account_keys, const std::vector<tx_source_entry>& sources, const std::vector<tx_destination_entry>& destinations, std::vector<uint8_t> extra, transaction& tx, uint64_t unlock_time, crypto::secret_key &txkey);
 
   template<typename T>
   bool find_tx_extra_field_by_type(const std::vector<tx_extra_field>& tx_extra_fields, T& field)

src/wallet/wallet2.cpp

@@ -540,6 +540,9 @@ bool wallet2::store_keys(const std::string& keys_file_name, const std::string& p
   value2.SetInt(m_always_confirm_transfers ? 1 :0);
   json.AddMember("always_confirm_transfers", value2, json.GetAllocator());
 
+  value2.SetInt(m_store_tx_keys ? 1 :0);
+  json.AddMember("store_tx_keys", value2, json.GetAllocator());
+
   // Serialize the JSON object
   rapidjson::StringBuffer buffer;
   rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
@@ -620,6 +623,7 @@ void wallet2::load_keys(const std::string& keys_file_name, const std::string& pa
       m_watch_only = false;
     }
     m_always_confirm_transfers = json.HasMember("always_confirm_transfers") && (json["always_confirm_transfers"].GetInt() != 0);
+    m_store_tx_keys = json.HasMember("store_tx_keys") && (json["store_tx_keys"].GetInt() != 0);
   }
 
   const cryptonote::account_keys& keys = m_account.get_keys();
@@ -1325,7 +1329,8 @@ void wallet2::commit_tx(pending_tx& ptx)
 
   txid = get_transaction_hash(ptx.tx);
   add_unconfirmed_tx(ptx.tx, ptx.change_dts.amount);
-  m_tx_keys.insert(std::make_pair(txid, ptx.tx_key));
+  if (store_tx_keys())
+    m_tx_keys.insert(std::make_pair(txid, ptx.tx_key));
 
   LOG_PRINT_L2("transaction " << txid << " generated ok and sent to daemon, key_images: [" << ptx.key_images << "]");
 
@@ -1578,7 +1583,7 @@ void wallet2::transfer_selected(const std::vector<cryptonote::tx_destination_ent
   }
 
   crypto::secret_key tx_key;
-  bool r = cryptonote::construct_tx(m_account.get_keys(), sources, splitted_dsts, extra, tx, unlock_time, tx_key);
+  bool r = cryptonote::construct_tx_and_get_tx_key(m_account.get_keys(), sources, splitted_dsts, extra, tx, unlock_time, tx_key);
   THROW_WALLET_EXCEPTION_IF(!r, error::tx_not_constructed, sources, splitted_dsts, unlock_time, m_testnet);
   THROW_WALLET_EXCEPTION_IF(m_upper_transaction_size_limit <= get_object_blobsize(tx), error::tx_too_big, tx, m_upper_transaction_size_limit);
 
@@ -1925,7 +1930,7 @@ void wallet2::transfer_dust(size_t num_outputs, uint64_t unlock_time, uint64_t n
     std::to_string(dust) + ", dust_threshold = " + std::to_string(dust_policy.dust_threshold));
 
   crypto::secret_key tx_key;
-  bool r = cryptonote::construct_tx(m_account.get_keys(), sources, splitted_dsts, extra, tx, unlock_time, tx_key);
+  bool r = cryptonote::construct_tx_and_get_tx_key(m_account.get_keys(), sources, splitted_dsts, extra, tx, unlock_time, tx_key);
   THROW_WALLET_EXCEPTION_IF(!r, error::tx_not_constructed, sources, splitted_dsts, unlock_time, m_testnet);
   THROW_WALLET_EXCEPTION_IF(m_upper_transaction_size_limit <= get_object_blobsize(tx), error::tx_too_big, tx, m_upper_transaction_size_limit);
 

src/wallet/wallet2.h

@@ -80,9 +80,9 @@ namespace tools
 
   class wallet2
   {
-    wallet2(const wallet2&) : m_run(true), m_callback(0), m_testnet(false), m_always_confirm_transfers (false) {};
+    wallet2(const wallet2&) : m_run(true), m_callback(0), m_testnet(false), m_always_confirm_transfers (false), m_store_tx_keys(false) {};
   public:
-    wallet2(bool testnet = false, bool restricted = false) : m_run(true), m_callback(0), m_testnet(testnet), m_restricted(restricted), is_old_file_format(false) {};
+    wallet2(bool testnet = false, bool restricted = false) : m_run(true), m_callback(0), m_testnet(testnet), m_restricted(restricted), is_old_file_format(false), m_store_tx_keys(false) {};
     struct transfer_details
     {
       uint64_t m_block_height;
@@ -292,6 +292,8 @@ namespace tools
 
     bool always_confirm_transfers() const { return m_always_confirm_transfers; }
     void always_confirm_transfers(bool always) { m_always_confirm_transfers = always; }
+    bool store_tx_keys() const { return m_store_tx_keys; }
+    void store_tx_keys(bool store) { m_store_tx_keys = store; }
 
     bool get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key) const;
 
@@ -351,6 +353,7 @@ namespace tools
     bool is_old_file_format; /*!< Whether the wallet file is of an old file format */
     bool m_watch_only; /*!< no spend key */
     bool m_always_confirm_transfers;
+    bool m_store_tx_keys; /*!< request txkey to be returned in RPC, and store in the wallet cache file */
   };
 }
 BOOST_CLASS_VERSION(tools::wallet2, 8)
@@ -585,7 +588,7 @@ namespace tools
     }
 
     crypto::secret_key tx_key;
-    bool r = cryptonote::construct_tx(m_account.get_keys(), sources, splitted_dsts, extra, tx, unlock_time, tx_key);
+    bool r = cryptonote::construct_tx_and_get_tx_key(m_account.get_keys(), sources, splitted_dsts, extra, tx, unlock_time, tx_key);
     THROW_WALLET_EXCEPTION_IF(!r, error::tx_not_constructed, sources, splitted_dsts, unlock_time, m_testnet);
     THROW_WALLET_EXCEPTION_IF(m_upper_transaction_size_limit <= get_object_blobsize(tx), error::tx_too_big, tx, m_upper_transaction_size_limit);
 

src/wallet/wallet_rpc_server.cpp

@@ -218,7 +218,8 @@ namespace tools
 
       // populate response with tx hash
       res.tx_hash = boost::lexical_cast<std::string>(cryptonote::get_transaction_hash(ptx_vector.back().tx));
-      res.tx_key = boost::lexical_cast<std::string>(ptx_vector.back().tx_key);
+      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)
@@ -275,7 +276,8 @@ namespace tools
       for (auto & ptx : ptx_vector)
       {
         res.tx_hash_list.push_back(boost::lexical_cast<std::string>(cryptonote::get_transaction_hash(ptx.tx)));
-        res.tx_key_list.push_back(boost::lexical_cast<std::string>(ptx.tx_key));
+        if (req.get_tx_keys)
+          res.tx_key_list.push_back(boost::lexical_cast<std::string>(ptx.tx_key));
       }
 
       return true;
@@ -320,7 +322,8 @@ namespace tools
       for (auto & ptx : ptx_vector)
       {
         res.tx_hash_list.push_back(boost::lexical_cast<std::string>(cryptonote::get_transaction_hash(ptx.tx)));
-        res.tx_key_list.push_back(boost::lexical_cast<std::string>(ptx.tx_key));
+        if (req.get_tx_keys)
+          res.tx_key_list.push_back(boost::lexical_cast<std::string>(ptx.tx_key));
       }
 
       return true;

src/wallet/wallet_rpc_server_commands_defs.h

@@ -97,6 +97,7 @@ namespace wallet_rpc
       uint64_t mixin;
       uint64_t unlock_time;
       std::string payment_id;
+      bool get_tx_key;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(destinations)
@@ -104,6 +105,7 @@ namespace wallet_rpc
         KV_SERIALIZE(mixin)
         KV_SERIALIZE(unlock_time)
         KV_SERIALIZE(payment_id)
+        KV_SERIALIZE(get_tx_key)
       END_KV_SERIALIZE_MAP()
     };
 
@@ -129,6 +131,7 @@ namespace wallet_rpc
       uint64_t unlock_time;
       std::string payment_id;
       bool new_algorithm;
+      bool get_tx_keys;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(destinations)
@@ -137,6 +140,7 @@ namespace wallet_rpc
         KV_SERIALIZE(unlock_time)
         KV_SERIALIZE(payment_id)
         KV_SERIALIZE(new_algorithm)
+        KV_SERIALIZE(get_tx_keys)
       END_KV_SERIALIZE_MAP()
     };
 
@@ -156,7 +160,10 @@ namespace wallet_rpc
   {
     struct request
     {
+      bool get_tx_keys;
+
       BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(get_tx_keys)
       END_KV_SERIALIZE_MAP()
     };