Create utility RPCs for PSBT

decodepsbt takes a PSBT and decodes it to JSON

combinepsbt takes multiple PSBTs for the same tx and combines them.

finalizepsbt takes a PSBT and finalizes the inputs. If all inputs
are final, it extracts the network serialized transaction and returns
that instead of a PSBT unless instructed otherwise.

createpsbt is like createrawtransaction but for PSBTs instead of
raw transactions.

convertpsbt takes a network serialized transaction and converts it
into a psbt. The resulting psbt will lose all signature data and
an explicit flag must be set to allow transactions with signature
data to be converted.

1 files changed, 23 insertions, 0 deletions

diff --git a/src/core_write.cpp b/src/core_write.cpp
index ee6737201b..1272266235 100644
--- a/src/core_write.cpp
+++ b/src/core_write.cpp
@@ -70,6 +70,13 @@ const std::map<unsigned char, std::string> mapSigHashTypes = {
     {static_cast<unsigned char>(SIGHASH_SINGLE|SIGHASH_ANYONECANPAY), std::string("SINGLE|ANYONECANPAY")},
 };
 
+std::string SighashToStr(unsigned char sighash_type)
+{
+    const auto& it = mapSigHashTypes.find(sighash_type);
+    if (it == mapSigHashTypes.end()) return "";
+    return it->second;
+}
+
 /**
  * Create the assembly string representation of a CScript object.
  * @param[in] script    CScript object to convert into the asm string representation.
@@ -128,6 +135,22 @@ std::string EncodeHexTx(const CTransaction& tx, const int serializeFlags)
     return HexStr(ssTx.begin(), ssTx.end());
 }
 
+void ScriptToUniv(const CScript& script, UniValue& out, bool include_address)
+{
+    out.pushKV("asm", ScriptToAsmStr(script));
+    out.pushKV("hex", HexStr(script.begin(), script.end()));
+
+    std::vector<std::vector<unsigned char>> solns;
+    txnouttype type;
+    Solver(script, type, solns);
+    out.pushKV("type", GetTxnOutputType(type));
+
+    CTxDestination address;
+    if (include_address && ExtractDestination(script, address)) {
+        out.pushKV("address", EncodeDestination(address));
+    }
+}
+
 void ScriptPubKeyToUniv(const CScript& scriptPubKey,
                         UniValue& out, bool fIncludeHex)
 {