From be066fad7d2a8f95d50667262f255ce67f49b51a Mon Sep 17 00:00:00 2001
From: Peter Todd <pete@petertodd.org>
Date: Mon, 15 Jul 2013 01:22:10 -0400
Subject: [PATCH] Add RPC call decodescript

---
 src/bitcoinrpc.cpp        |  1 +
 src/bitcoinrpc.h          |  1 +
 src/rpcblockchain.cpp     |  4 ++--
 src/rpcrawtransaction.cpp | 30 +++++++++++++++++++++++++++---
 4 files changed, 31 insertions(+), 5 deletions(-)

diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index 4e303526b..d1082c7ec 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -280,6 +280,7 @@ static const CRPCCommand vRPCCommands[] =
     { "getrawtransaction",      &getrawtransaction,      false,     false },
     { "createrawtransaction",   &createrawtransaction,   false,     false },
     { "decoderawtransaction",   &decoderawtransaction,   false,     false },
+    { "decodescript",           &decodescript,           false,     false },
     { "signrawtransaction",     &signrawtransaction,     false,     false },
     { "sendrawtransaction",     &sendrawtransaction,     false,     false },
     { "gettxoutsetinfo",        &gettxoutsetinfo,        true,      false },
diff --git a/src/bitcoinrpc.h b/src/bitcoinrpc.h
index 96c9fa1c6..ab0a0bc96 100644
--- a/src/bitcoinrpc.h
+++ b/src/bitcoinrpc.h
@@ -207,6 +207,7 @@ extern json_spirit::Value lockunspent(const json_spirit::Array& params, bool fHe
 extern json_spirit::Value listlockunspent(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value createrawtransaction(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value decoderawtransaction(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value decodescript(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value signrawtransaction(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value sendrawtransaction(const json_spirit::Array& params, bool fHelp);
 
diff --git a/src/rpcblockchain.cpp b/src/rpcblockchain.cpp
index adff708a0..398f33605 100644
--- a/src/rpcblockchain.cpp
+++ b/src/rpcblockchain.cpp
@@ -9,7 +9,7 @@
 using namespace json_spirit;
 using namespace std;
 
-void ScriptPubKeyToJSON(const CScript& scriptPubKey, Object& out);
+void ScriptPubKeyToJSON(const CScript& scriptPubKey, Object& out, bool fIncludeHex);
 
 double GetDifficulty(const CBlockIndex* blockindex)
 {
@@ -245,7 +245,7 @@ Value gettxout(const Array& params, bool fHelp)
         ret.push_back(Pair("confirmations", pcoinsTip->GetBestBlock()->nHeight - coins.nHeight + 1));
     ret.push_back(Pair("value", ValueFromAmount(coins.vout[n].nValue)));
     Object o;
-    ScriptPubKeyToJSON(coins.vout[n].scriptPubKey, o);
+    ScriptPubKeyToJSON(coins.vout[n].scriptPubKey, o, true);
     ret.push_back(Pair("scriptPubKey", o));
     ret.push_back(Pair("version", coins.nVersion));
     ret.push_back(Pair("coinbase", coins.fCoinBase));
diff --git a/src/rpcrawtransaction.cpp b/src/rpcrawtransaction.cpp
index f08598f10..5f33849f7 100644
--- a/src/rpcrawtransaction.cpp
+++ b/src/rpcrawtransaction.cpp
@@ -17,14 +17,15 @@ using namespace boost;
 using namespace boost::assign;
 using namespace json_spirit;
 
-void ScriptPubKeyToJSON(const CScript& scriptPubKey, Object& out)
+void ScriptPubKeyToJSON(const CScript& scriptPubKey, Object& out, bool fIncludeHex)
 {
     txnouttype type;
     vector<CTxDestination> addresses;
     int nRequired;
 
     out.push_back(Pair("asm", scriptPubKey.ToString()));
-    out.push_back(Pair("hex", HexStr(scriptPubKey.begin(), scriptPubKey.end())));
+    if (fIncludeHex)
+        out.push_back(Pair("hex", HexStr(scriptPubKey.begin(), scriptPubKey.end())));
 
     if (!ExtractDestinations(scriptPubKey, type, addresses, nRequired))
     {
@@ -73,7 +74,7 @@ void TxToJSON(const CTransaction& tx, const uint256 hashBlock, Object& entry)
         out.push_back(Pair("value", ValueFromAmount(txout.nValue)));
         out.push_back(Pair("n", (boost::int64_t)i));
         Object o;
-        ScriptPubKeyToJSON(txout.scriptPubKey, o);
+        ScriptPubKeyToJSON(txout.scriptPubKey, o, false);
         out.push_back(Pair("scriptPubKey", o));
         vout.push_back(out);
     }
@@ -301,6 +302,29 @@ Value decoderawtransaction(const Array& params, bool fHelp)
     return result;
 }
 
+Value decodescript(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() != 1)
+        throw runtime_error(
+            "decodescript <hex string>\n"
+            "Decode a hex-encoded script.");
+
+    RPCTypeCheck(params, list_of(str_type));
+
+    Object r;
+    CScript script;
+    if (params[0].get_str().size() > 0){
+        vector<unsigned char> scriptData(ParseHexV(params[0], "argument"));
+        script = CScript(scriptData.begin(), scriptData.end());
+    } else {
+        // Empty scripts are valid
+    }
+    ScriptPubKeyToJSON(script, r, false);
+
+    r.push_back(Pair("p2sh", CBitcoinAddress(script.GetID()).ToString()));
+    return r;
+}
+
 Value signrawtransaction(const Array& params, bool fHelp)
 {
     if (fHelp || params.size() < 1 || params.size() > 4)