From b9024fdda33e5c7a2e61705822ded034dd4f8e3b Mon Sep 17 00:00:00 2001
From: Anthony Towns <aj@erisian.com.au>
Date: Wed, 25 Apr 2018 18:43:31 +1000
Subject: segwit support for createmultisig RPC

---
 src/rpc/misc.cpp | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

(limited to 'src/rpc')

diff --git a/src/rpc/misc.cpp b/src/rpc/misc.cpp
index 4eeb7f29d2..09812bb980 100644
--- a/src/rpc/misc.cpp
+++ b/src/rpc/misc.cpp
@@ -12,6 +12,7 @@
 #include <httpserver.h>
 #include <net.h>
 #include <netbase.h>
+#include <outputtype.h>
 #include <rpc/blockchain.h>
 #include <rpc/server.h>
 #include <rpc/util.h>
@@ -91,9 +92,9 @@ class CWallet;
 
 static UniValue createmultisig(const JSONRPCRequest& request)
 {
-    if (request.fHelp || request.params.size() < 2 || request.params.size() > 2)
+    if (request.fHelp || request.params.size() < 2 || request.params.size() > 3)
     {
-        std::string msg = "createmultisig nrequired [\"key\",...]\n"
+        std::string msg = "createmultisig nrequired [\"key\",...] ( \"address_type\" )\n"
             "\nCreates a multi-signature address with n signature of m keys required.\n"
             "It returns a json object with the address and redeemScript.\n"
             "\nArguments:\n"
@@ -103,6 +104,7 @@ static UniValue createmultisig(const JSONRPCRequest& request)
             "       \"key\"                    (string) The hex-encoded public key\n"
             "       ,...\n"
             "     ]\n"
+            "3. \"address_type\"               (string, optional) The address type to use. Options are \"legacy\", \"p2sh-segwit\", and \"bech32\". Default is legacy.\n"
 
             "\nResult:\n"
             "{\n"
@@ -133,12 +135,21 @@ static UniValue createmultisig(const JSONRPCRequest& request)
         }
     }
 
+    // Get the output type
+    OutputType output_type = OutputType::LEGACY;
+    if (!request.params[2].isNull()) {
+        if (!ParseOutputType(request.params[2].get_str(), output_type)) {
+            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Unknown address type '%s'", request.params[2].get_str()));
+        }
+    }
+
     // Construct using pay-to-script-hash:
-    CScript inner = CreateMultisigRedeemscript(required, pubkeys);
-    CScriptID innerID(inner);
+    const CScript inner = CreateMultisigRedeemscript(required, pubkeys);
+    CBasicKeyStore keystore;
+    const CTxDestination dest = AddAndGetDestinationForScript(keystore, inner, output_type);
 
     UniValue result(UniValue::VOBJ);
-    result.pushKV("address", EncodeDestination(innerID));
+    result.pushKV("address", EncodeDestination(dest));
     result.pushKV("redeemScript", HexStr(inner.begin(), inner.end()));
 
     return result;
-- 
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