Move `createmultisig` from rpcwallet to rpcmisc

Enables it in --disable-wallet compiles.

1 files changed, 101 insertions, 0 deletions

diff --git a/src/rpcmisc.cpp b/src/rpcmisc.cpp
index 240bd68ba4..df68bdf337 100644
--- a/src/rpcmisc.cpp
+++ b/src/rpcmisc.cpp
@@ -171,4 +171,105 @@ Value validateaddress(const Array& params, bool fHelp)
     return ret;
 }
 
+//
+// Used by addmultisigaddress / createmultisig:
+//
+CScript _createmultisig(const Array& params)
+{
+    int nRequired = params[0].get_int();
+    const Array& keys = params[1].get_array();
+
+    // Gather public keys
+    if (nRequired < 1)
+        throw runtime_error("a multisignature address must require at least one key to redeem");
+    if ((int)keys.size() < nRequired)
+        throw runtime_error(
+            strprintf("not enough keys supplied "
+                      "(got %"PRIszu" keys, but need at least %d to redeem)", keys.size(), nRequired));
+    std::vector<CPubKey> pubkeys;
+    pubkeys.resize(keys.size());
+    for (unsigned int i = 0; i < keys.size(); i++)
+    {
+        const std::string& ks = keys[i].get_str();
+#ifdef ENABLE_WALLET
+        // Case 1: Bitcoin address and we have full public key:
+        CBitcoinAddress address(ks);
+        if (pwalletMain && address.IsValid())
+        {
+            CKeyID keyID;
+            if (!address.GetKeyID(keyID))
+                throw runtime_error(
+                    strprintf("%s does not refer to a key",ks.c_str()));
+            CPubKey vchPubKey;
+            if (!pwalletMain->GetPubKey(keyID, vchPubKey))
+                throw runtime_error(
+                    strprintf("no full public key for address %s",ks.c_str()));
+            if (!vchPubKey.IsFullyValid())
+                throw runtime_error(" Invalid public key: "+ks);
+            pubkeys[i] = vchPubKey;
+        }
+
+        // Case 2: hex public key
+        else
+#endif
+        if (IsHex(ks))
+        {
+            CPubKey vchPubKey(ParseHex(ks));
+            if (!vchPubKey.IsFullyValid())
+                throw runtime_error(" Invalid public key: "+ks);
+            pubkeys[i] = vchPubKey;
+        }
+        else
+        {
+            throw runtime_error(" Invalid public key: "+ks);
+        }
+    }
+    CScript result;
+    result.SetMultisig(nRequired, pubkeys);
+    return result;
+}
+
+Value createmultisig(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 2 || params.size() > 2)
+    {
+        string msg = "createmultisig nrequired [\"key\",...]\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"
+            "1. nrequired      (numeric, required) The number of required signatures out of the n keys or addresses.\n"
+            "2. \"keys\"       (string, required) A json array of keys which are bitcoin addresses or hex-encoded public keys\n"
+            "     [\n"
+            "       \"key\"    (string) bitcoin address or hex-encoded public key\n"
+            "       ,...\n"
+            "     ]\n"
+
+            "\nResult:\n"
+            "{\n"
+            "  \"address\":\"multisigaddress\",  (string) The value of the new multisig address.\n"
+            "  \"redeemScript\":\"script\"       (string) The string value of the hex-encoded redemption script.\n"
+            "}\n"
+
+            "\nExamples:\n"
+            "\nCreate a multisig address from 2 addresses\n"
+            + HelpExampleCli("createmultisig", "2 \"[\\\"16sSauSf5pF2UkUwvKGq4qjNRzBZYqgEL5\\\",\\\"171sgjn4YtPu27adkKGrdDwzRTxnRkBfKV\\\"]\"") +
+            "\nAs a json rpc call\n"
+            + HelpExampleRpc("icreatemultisig", "2, \"[\\\"16sSauSf5pF2UkUwvKGq4qjNRzBZYqgEL5\\\",\\\"171sgjn4YtPu27adkKGrdDwzRTxnRkBfKV\\\"]\"")
+        ;
+        throw runtime_error(msg);
+    }
+
+    // Construct using pay-to-script-hash:
+    CScript inner = _createmultisig(params);
+    CScriptID innerID = inner.GetID();
+    CBitcoinAddress address(innerID);
+
+    Object result;
+    result.push_back(Pair("address", address.ToString()));
+    result.push_back(Pair("redeemScript", HexStr(inner.begin(), inner.end())));
+
+    return result;
+}
+