Merge #11178: Add iswitness parameter to decode- and fundrawtransaction RPCs

6f39ac0 Add test for decoderawtransaction bool (MeshCollider)
bbdbe80 Add iswitness parameter to decode- and fundrawtransaction RPCs (MeshCollider)

Pull request description:

  Suggested in https://github.com/bitcoin/bitcoin/pull/10481#issuecomment-325244946, this adds the option to explicitly choose whether a serialized transaction should be decoded as a witness or non-witness transaction rather than relying on the heuristic checks in #10481. The parameter defaults to relying on #10481 if not included, but it overrides that if included.

Tree-SHA512: d4846a5bb7d64dc19c516445488b00af329fc1f4181d9dfdf9f2382a086568edc98250a4ac7594e24a1bc231dfdee53c699b12c8380c355b920a67cc6770b7a9

2 files changed, 13 insertions, 5 deletions

diff --git a/src/rpc/client.cpp b/src/rpc/client.cpp
index f2fa114313..e641493e1e 100644
--- a/src/rpc/client.cpp
+++ b/src/rpc/client.cpp
@@ -91,11 +91,13 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "createrawtransaction", 1, "outputs" },
     { "createrawtransaction", 2, "locktime" },
     { "createrawtransaction", 3, "replaceable" },
+    { "decoderawtransaction", 1, "iswitness" },
     { "signrawtransaction", 1, "prevtxs" },
     { "signrawtransaction", 2, "privkeys" },
     { "sendrawtransaction", 1, "allowhighfees" },
     { "combinerawtransaction", 0, "txs" },
     { "fundrawtransaction", 1, "options" },
+    { "fundrawtransaction", 2, "iswitness" },
     { "gettxout", 1, "n" },
     { "gettxout", 2, "include_mempool" },
     { "gettxoutproof", 0, "txids" },
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index fbebdf44d4..1049131d5e 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -441,13 +441,15 @@ UniValue createrawtransaction(const JSONRPCRequest& request)
 
 UniValue decoderawtransaction(const JSONRPCRequest& request)
 {
-    if (request.fHelp || request.params.size() != 1)
+    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
         throw std::runtime_error(
-            "decoderawtransaction \"hexstring\"\n"
+            "decoderawtransaction \"hexstring\" ( iswitness )\n"
             "\nReturn a JSON object representing the serialized, hex-encoded transaction.\n"
 
             "\nArguments:\n"
             "1. \"hexstring\"      (string, required) The transaction hex string\n"
+            "2. iswitness          (boolean, optional) Whether the transaction hex is a serialized witness transaction\n"
+            "                         If iswitness is not present, heuristic tests will be used in decoding\n"
 
             "\nResult:\n"
             "{\n"
@@ -495,12 +497,16 @@ UniValue decoderawtransaction(const JSONRPCRequest& request)
         );
 
     LOCK(cs_main);
-    RPCTypeCheck(request.params, {UniValue::VSTR});
+    RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VBOOL});
 
     CMutableTransaction mtx;
 
-    if (!DecodeHexTx(mtx, request.params[0].get_str(), true))
+    bool try_witness = request.params[1].isNull() ? true : request.params[1].get_bool();
+    bool try_no_witness = request.params[1].isNull() ? true : !request.params[1].get_bool();
+
+    if (!DecodeHexTx(mtx, request.params[0].get_str(), try_no_witness, try_witness)) {
         throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed");
+    }
 
     UniValue result(UniValue::VOBJ);
     TxToUniv(CTransaction(std::move(mtx)), uint256(), result, false);
@@ -1016,7 +1022,7 @@ static const CRPCCommand commands[] =
   //  --------------------- ------------------------  -----------------------  ----------
     { "rawtransactions",    "getrawtransaction",      &getrawtransaction,      {"txid","verbose","blockhash"} },
     { "rawtransactions",    "createrawtransaction",   &createrawtransaction,   {"inputs","outputs","locktime","replaceable"} },
-    { "rawtransactions",    "decoderawtransaction",   &decoderawtransaction,   {"hexstring"} },
+    { "rawtransactions",    "decoderawtransaction",   &decoderawtransaction,   {"hexstring","iswitness"} },
     { "rawtransactions",    "decodescript",           &decodescript,           {"hexstring"} },
     { "rawtransactions",    "sendrawtransaction",     &sendrawtransaction,     {"hexstring","allowhighfees"} },
     { "rawtransactions",    "combinerawtransaction",  &combinerawtransaction,  {"txs"} },