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

1 files changed, 97 insertions, 0 deletions

diff --git a/src/wallet/wallet_rpc_server_commands_defs.h b/src/wallet/wallet_rpc_server_commands_defs.h
index a0f43c9b9..11f852d6f 100644
--- a/src/wallet/wallet_rpc_server_commands_defs.h
+++ b/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