// Returns:
// false - invalid move tx
// true - non-move tx or valid tx
bool IsValid(const CTransaction& tx, Move &outMove)
{
if (!GetNameOfTx(tx, vchName) || !GetValueOfNameTx(tx, vchValue))
return true;
std::string sName = stringFromVch(vchName), sValue = stringFromVch(vchValue);
if (dup.count(sName))
return error("GameStepValidator: duplicate player name %s", sName.c_str());
dup.insert(sName);
Move m;
m.Parse(sName, sValue);
if (!m)
return error("GameStepValidator: cannot parse move %s for player %s", sValue.c_str(), sName.c_str());
if (!m.IsValid(*pstate))
return error("GameStepValidator: invalid move for the game state: move %s for player %s", sValue.c_str(), sName.c_str());
std::string addressLock = m.AddressOperationPermission(*pstate);
if (!addressLock.empty())
{
// If one of inputs has address equal to addressLock, then that input has been signed by the address owner
// and thus authorizes the address change operation
bool found = false;
if (!pTxDB)
{
pTxDB = new CTxDB("r");
fOwnTxDB = true;
}
for (int i = 0; i < tx.vin.size(); i++)
{
COutPoint prevout = tx.vin[i].prevout;
CTransaction txPrev;
CTxIndex txindex;
if (!pTxDB->ReadTxIndex(prevout.hash, txindex) || txindex.pos == CDiskTxPos(1,1,1))
continue;
else if (!txPrev.ReadFromDisk(txindex.pos))
continue;
if (prevout.n >= txPrev.vout.size())
continue;
const CTxOut &vout = txPrev.vout[prevout.n];
std::string address;
if (ExtractDestination(vout.scriptPubKey, address) && address == addressLock)
{
found = true;
break;
}
}
if (!found)
return error("GameStepValidator: address operation permission denied: move %s for player %s", sValue.c_str(), sName.c_str());
}
outMove = m;
return true;
}
// Returns:
// false - invalid move tx
// true - non-move tx or valid tx
bool IsValid(const CTransaction& tx, Move &outMove)
{
if (tx.nVersion != NAMECOIN_TX_VERSION)
return true;
std::vector<vchType> vvchArgs;
int op, nOut;
if (!DecodeNameTx (tx, op, nOut, vvchArgs))
return error ("GameStepValidator: could not decode a name tx");
vchType vchName, vchValue;
switch (op)
{
case OP_NAME_FIRSTUPDATE:
vchName = vvchArgs[0];
vchValue = vvchArgs[2];
break;
case OP_NAME_UPDATE:
vchName = vvchArgs[0];
vchValue = vvchArgs[1];
break;
case OP_NAME_NEW:
return true;
default:
return error ("GameStepValidator: invalid name tx found");
}
const std::string sName = stringFromVch(vchName);
const std::string sValue = stringFromVch(vchValue);
if (dup.count(sName))
return error ("GameStepValidator: duplicate player name %s",
sName.c_str ());
dup.insert(sName);
Move m;
m.Parse(sName, sValue);
if (!m)
return error("GameStepValidator: cannot parse move %s for player %s", sValue.c_str(), sName.c_str());
if (!m.IsValid(*pstate))
return error("GameStepValidator: invalid move for the game state: move %s for player %s", sValue.c_str(), sName.c_str());
/* If this is a spawn move, find out the coin's value and set
the spawned player's value to it. */
if (m.IsSpawn ())
{
if (op != OP_NAME_FIRSTUPDATE)
return error ("GameStepValidator: spawn is not firstupdate");
m.coinAmount = tx.vout[nOut].nValue;
}
else if (op != OP_NAME_UPDATE)
return error ("GameStepValidator: name_firstupdate is not spawn");
std::string addressLock = m.AddressOperationPermission(*pstate);
if (!addressLock.empty())
{
// If one of inputs has address equal to addressLock, then that input has been signed by the address owner
// and thus authorizes the address change operation
bool found = false;
if (!pdbset)
{
pdbset = new DatabaseSet("r");
fOwnDb = true;
}
for (int i = 0; i < tx.vin.size(); i++)
{
COutPoint prevout = tx.vin[i].prevout;
CTransaction txPrev;
CTxIndex txindex;
if (!pdbset->tx ().ReadTxIndex (prevout.hash, txindex)
|| txindex.pos == CDiskTxPos(1,1,1))
continue;
else if (!txPrev.ReadFromDisk(txindex.pos))
continue;
if (prevout.n >= txPrev.vout.size())
continue;
const CTxOut &vout = txPrev.vout[prevout.n];
std::string address;
if (ExtractDestination(vout.scriptPubKey, address) && address == addressLock)
{
found = true;
break;
}
}
if (!found)
return error("GameStepValidator: address operation permission denied: move %s for player %s", sValue.c_str(), sName.c_str());
}
outMove = m;
return true;
}
