Add OP_RETURN support in createrawtransaction RPC call, add tests.

src/rpcrawtransaction.cpp

@@ -318,8 +318,9 @@ UniValue createrawtransaction(const UniValue& params, bool fHelp)
 {
     if (fHelp || params.size() != 2)
         throw runtime_error(
-            "createrawtransaction [{\"txid\":\"id\",\"vout\":n},...] {\"address\":amount,...}\n"
+            "createrawtransaction [{\"txid\":\"id\",\"vout\":n},...] {\"address\":amount,\"data\":\"hex\",...}\n"
-            "\nCreate a transaction spending the given inputs and sending to the given addresses.\n"
+            "\nCreate a transaction spending the given inputs and creating new outputs.\n"
+            "Outputs can be addresses or data.\n"
             "Returns hex-encoded raw transaction.\n"
             "Note that the transaction's inputs are not signed, and\n"
             "it is not stored in the wallet or transmitted to the network.\n"
@@ -333,18 +334,20 @@ UniValue createrawtransaction(const UniValue& params, bool fHelp)
             "       }\n"
             "       ,...\n"
             "     ]\n"
-            "2. \"addresses\"           (string, required) a json object with addresses as keys and amounts as values\n"
+            "2. \"outputs\"             (string, required) a json object with outputs\n"
             "    {\n"
             "      \"address\": x.xxx   (numeric, required) The key is the bitcoin address, the value is the " + CURRENCY_UNIT + " amount\n"
-            "      ,...\n"
+            "      \"data\": \"hex\",     (string, required) The key is \"data\", the value is hex encoded data\n"
+            "      ...\n"
             "    }\n"
-
             "\nResult:\n"
             "\"transaction\"            (string) hex string of the transaction\n"
 
             "\nExamples\n"
             + HelpExampleCli("createrawtransaction", "\"[{\\\"txid\\\":\\\"myid\\\",\\\"vout\\\":0}]\" \"{\\\"address\\\":0.01}\"")
+            + HelpExampleCli("createrawtransaction", "\"[{\\\"txid\\\":\\\"myid\\\",\\\"vout\\\":0}]\" \"{\\\"data\\\":\\\"00010203\\\"}\"")
             + HelpExampleRpc("createrawtransaction", "\"[{\\\"txid\\\":\\\"myid\\\",\\\"vout\\\":0}]\", \"{\\\"address\\\":0.01}\"")
+            + HelpExampleRpc("createrawtransaction", "\"[{\\\"txid\\\":\\\"myid\\\",\\\"vout\\\":0}]\", \"{\\\"data\\\":\\\"00010203\\\"}\"")
         );
 
     LOCK(cs_main);
@@ -375,6 +378,13 @@ UniValue createrawtransaction(const UniValue& params, bool fHelp)
     set<CBitcoinAddress> setAddress;
     vector<string> addrList = sendTo.getKeys();
     BOOST_FOREACH(const string& name_, addrList) {
+
+        if (name_ == "data") {
+            std::vector<unsigned char> data = ParseHexV(sendTo[name_].getValStr(),"Data");
+
+            CTxOut out(0, CScript() << OP_RETURN << data);
+            rawTx.vout.push_back(out);
+        } else {
             CBitcoinAddress address(name_);
             if (!address.IsValid())
                 throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, string("Invalid Bitcoin address: ")+name_);
@@ -389,6 +399,7 @@ UniValue createrawtransaction(const UniValue& params, bool fHelp)
             CTxOut out(nAmount, scriptPubKey);
             rawTx.vout.push_back(out);
         }
+    }
 
     return EncodeHexTx(rawTx);
 }

src/test/rpc_tests.cpp

@@ -110,6 +110,24 @@ BOOST_AUTO_TEST_CASE(rpc_rawsign)
     BOOST_CHECK(find_value(r.get_obj(), "complete").get_bool() == true);
 }
 
+BOOST_AUTO_TEST_CASE(rpc_createraw_op_return)
+{
+    BOOST_CHECK_NO_THROW(CallRPC("createrawtransaction [{\"txid\":\"a3b807410df0b60fcb9736768df5823938b2f838694939ba45f3c0a1bff150ed\",\"vout\":0}] {\"data\":\"68656c6c6f776f726c64\"}"));
+
+    // Allow more than one data transaction output
+    BOOST_CHECK_NO_THROW(CallRPC("createrawtransaction [{\"txid\":\"a3b807410df0b60fcb9736768df5823938b2f838694939ba45f3c0a1bff150ed\",\"vout\":0}] {\"data\":\"68656c6c6f776f726c64\",\"data\":\"68656c6c6f776f726c64\"}"));
+
+    // Key not "data" (bad address)
+    BOOST_CHECK_THROW(CallRPC("createrawtransaction [{\"txid\":\"a3b807410df0b60fcb9736768df5823938b2f838694939ba45f3c0a1bff150ed\",\"vout\":0}] {\"somedata\":\"68656c6c6f776f726c64\"}"), runtime_error);
+
+    // Bad hex encoding of data output
+    BOOST_CHECK_THROW(CallRPC("createrawtransaction [{\"txid\":\"a3b807410df0b60fcb9736768df5823938b2f838694939ba45f3c0a1bff150ed\",\"vout\":0}] {\"data\":\"12345\"}"), runtime_error);
+    BOOST_CHECK_THROW(CallRPC("createrawtransaction [{\"txid\":\"a3b807410df0b60fcb9736768df5823938b2f838694939ba45f3c0a1bff150ed\",\"vout\":0}] {\"data\":\"12345g\"}"), runtime_error);
+
+    // Data 81 bytes long
+    BOOST_CHECK_NO_THROW(CallRPC("createrawtransaction [{\"txid\":\"a3b807410df0b60fcb9736768df5823938b2f838694939ba45f3c0a1bff150ed\",\"vout\":0}] {\"data\":\"010203040506070809101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081\"}"));
+}
+
 BOOST_AUTO_TEST_CASE(rpc_format_monetary_values)
 {
     BOOST_CHECK(ValueFromAmount(0LL).write() == "0.00000000");