Auto merge of #1566 - daira:1557.make-v2-txns-standard, r=ageis

1557.make v2 txns standard

Make v2 transactions standard. This also corrects a rule about admitting large orphan transactions into the mempool, to account for v2-specific fields. ref #1557

src/test/transaction_tests.cpp

@@ -590,4 +590,55 @@ BOOST_AUTO_TEST_CASE(test_IsStandard)
     BOOST_CHECK(!IsStandardTx(t, reason));
 }
 
+BOOST_AUTO_TEST_CASE(test_IsStandardV2)
+{
+    LOCK(cs_main);
+    CBasicKeyStore keystore;
+    CCoinsView coinsDummy;
+    CCoinsViewCache coins(&coinsDummy);
+    std::vector<CMutableTransaction> dummyTransactions = SetupDummyInputs(keystore, coins);
+
+    CMutableTransaction t;
+    t.vin.resize(1);
+    t.vin[0].prevout.hash = dummyTransactions[0].GetHash();
+    t.vin[0].prevout.n = 1;
+    t.vin[0].scriptSig << std::vector<unsigned char>(65, 0);
+    t.vout.resize(1);
+    t.vout[0].nValue = 90*CENT;
+    CKey key;
+    key.MakeNewKey(true);
+    t.vout[0].scriptPubKey = GetScriptForDestination(key.GetPubKey().GetID());
+
+    string reason;
+    // A v2 transaction with no JoinSplits is still standard.
+    t.nVersion = 2;
+    BOOST_CHECK(IsStandardTx(t, reason));
+
+    // ... and with one JoinSplit.
+    t.vjoinsplit.push_back(JSDescription());
+    BOOST_CHECK(IsStandardTx(t, reason));
+
+    // ... and when that JoinSplit takes from a transparent input.
+    JSDescription *jsdesc = &t.vjoinsplit[0];
+    jsdesc->vpub_old = 10*CENT;
+    t.vout[0].nValue -= 10*CENT;
+    BOOST_CHECK(IsStandardTx(t, reason));
+
+    // A v2 transaction with JoinSplits but no transparent inputs is standard.
+    jsdesc->vpub_old = 0;
+    jsdesc->vpub_new = 100*CENT;
+    t.vout[0].nValue = 90*CENT;
+    t.vin.resize(0);
+    BOOST_CHECK(IsStandardTx(t, reason));
+
+    // v2 transactions can still be non-standard for the same reasons as v1.
+    t.vout[0].nValue = 501; // dust
+    BOOST_CHECK(!IsStandardTx(t, reason));
+
+    // v3 is not standard.
+    t.nVersion = 3;
+    t.vout[0].nValue = 90*CENT;
+    BOOST_CHECK(!IsStandardTx(t, reason));
+}
+
 BOOST_AUTO_TEST_SUITE_END()