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nameclaim.cpp
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nameclaim.cpp
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#include "nameclaim.h"
#include "hash.h"
#include "util.h"
std::vector<unsigned char> uint32_t_to_vch(uint32_t n)
{
std::vector<unsigned char> vchN;
vchN.resize(4);
vchN[0] = n >> 24;
vchN[1] = n >> 16;
vchN[2] = n >> 8;
vchN[3] = n;
return vchN;
}
uint32_t vch_to_uint32_t(std::vector<unsigned char>& vchN)
{
uint32_t n;
static const size_t uint32Size = sizeof(uint32_t);
if (vchN.size() != uint32Size) {
LogPrintf("%s() : a vector<unsigned char> with size other than 4 has been given\n", __func__);
return 0;
}
n = vchN[0] << 24 | vchN[1] << 16 | vchN[2] << 8 | vchN[3];
return n;
}
CScript ClaimNameScript(std::string name, std::string value, bool fakeSuffix)
{
std::vector<unsigned char> vchName(name.begin(), name.end());
std::vector<unsigned char> vchValue(value.begin(), value.end());
auto ret = CScript() << OP_CLAIM_NAME << vchName << vchValue << OP_2DROP << OP_DROP;
if (fakeSuffix) ret.push_back(OP_TRUE);
return ret;
}
CScript SupportClaimScript(std::string name, uint160 claimId, std::string value, bool fakeSuffix)
{
std::vector<unsigned char> vchName(name.begin(), name.end());
std::vector<unsigned char> vchClaimId(claimId.begin(), claimId.end());
CScript ret;
if (value.empty())
ret = CScript() << OP_SUPPORT_CLAIM << vchName << vchClaimId << OP_2DROP << OP_DROP;
else {
std::vector<unsigned char> vchValue(value.begin(), value.end());
ret = CScript() << OP_SUPPORT_CLAIM << vchName << vchClaimId << vchValue << OP_2DROP << OP_2DROP;
}
if (fakeSuffix) ret.push_back(OP_TRUE);
return ret;
}
CScript UpdateClaimScript(std::string name, uint160 claimId, std::string value)
{
std::vector<unsigned char> vchName(name.begin(), name.end());
std::vector<unsigned char> vchClaimId(claimId.begin(), claimId.end());
std::vector<unsigned char> vchValue(value.begin(), value.end());
return CScript() << OP_UPDATE_CLAIM << vchName << vchClaimId << vchValue << OP_2DROP << OP_2DROP << OP_TRUE;
}
bool DecodeClaimScript(const CScript& scriptIn, int& op, std::vector<std::vector<unsigned char> >& vvchParams, bool allowSupportMetadata)
{
CScript::const_iterator pc = scriptIn.begin();
return DecodeClaimScript(scriptIn, op, vvchParams, pc, allowSupportMetadata);
}
bool DecodeClaimScript(const CScript& scriptIn, int& op, std::vector<std::vector<unsigned char> >& vvchParams, CScript::const_iterator& pc, bool allowSupportMetadata)
{
op = -1;
opcodetype opcode;
if (!scriptIn.GetOp(pc, opcode))
{
return false;
}
if (opcode != OP_CLAIM_NAME && opcode != OP_SUPPORT_CLAIM && opcode != OP_UPDATE_CLAIM)
{
return false;
}
op = opcode;
std::vector<unsigned char> vchParam1;
std::vector<unsigned char> vchParam2;
std::vector<unsigned char> vchParam3;
// Valid formats:
// OP_CLAIM_NAME vchName vchValue OP_2DROP OP_DROP pubkeyscript
// OP_UPDATE_CLAIM vchName vchClaimId vchValue OP_2DROP OP_2DROP pubkeyscript
// OP_SUPPORT_CLAIM vchName vchClaimId OP_2DROP OP_DROP pubkeyscript
// OP_SUPPORT_CLAIM vchName vchClaimId vchValue OP_2DROP OP_2DROP pubkeyscript
// All others are invalid.
if (!scriptIn.GetOp(pc, opcode, vchParam1) || opcode < 0 || opcode > OP_PUSHDATA4)
{
return false;
}
if (!scriptIn.GetOp(pc, opcode, vchParam2) || opcode < 0 || opcode > OP_PUSHDATA4)
{
return false;
}
if (op == OP_UPDATE_CLAIM || op == OP_SUPPORT_CLAIM)
{
static const size_t claimIdHashSize = sizeof(uint160);
if (vchParam2.size() != claimIdHashSize) {
return false;
}
}
if (!scriptIn.GetOp(pc, opcode, vchParam3))
{
return false;
}
auto last_drop = OP_DROP;
if (opcode >= 0 && opcode <= OP_PUSHDATA4 && op != OP_CLAIM_NAME)
{
if (!scriptIn.GetOp(pc, opcode))
{
return false;
}
last_drop = OP_2DROP;
}
else if (op == OP_UPDATE_CLAIM)
{
return false;
}
if (opcode != OP_2DROP)
{
return false;
}
if (!scriptIn.GetOp(pc, opcode) || opcode != last_drop)
{
return false;
}
if (op == OP_SUPPORT_CLAIM && last_drop == OP_2DROP && !allowSupportMetadata)
{
return false;
}
vvchParams.push_back(std::move(vchParam1));
vvchParams.push_back(std::move(vchParam2));
if (last_drop == OP_2DROP)
{
vvchParams.push_back(std::move(vchParam3));
}
return true;
}
uint160 ClaimIdHash(const uint256& txhash, uint32_t nOut)
{
std::vector<unsigned char> claimToHash(txhash.begin(), txhash.end());
std::vector<unsigned char> vchnOut = uint32_t_to_vch(nOut);
claimToHash.insert(claimToHash.end(), vchnOut.begin(), vchnOut.end());
return Hash160(claimToHash);
}
CScript StripClaimScriptPrefix(const CScript& scriptIn)
{
int op;
return StripClaimScriptPrefix(scriptIn, op);
}
CScript StripClaimScriptPrefix(const CScript& scriptIn, int& op)
{
std::vector<std::vector<unsigned char> > vvchParams;
CScript::const_iterator pc = scriptIn.begin();
if (!DecodeClaimScript(scriptIn, op, vvchParams, pc))
{
return scriptIn;
}
return CScript(pc, scriptIn.end());
}
size_t ClaimScriptSize(const CScript& scriptIn)
{
CScript strippedScript = StripClaimScriptPrefix(scriptIn);
return scriptIn.size() - strippedScript.size();
}
size_t ClaimNameSize(const CScript& scriptIn)
{
std::vector<std::vector<unsigned char> > vvchParams;
CScript::const_iterator pc = scriptIn.begin();
int op;
if (!DecodeClaimScript(scriptIn, op, vvchParams, pc))
{
return 0;
}
else
{
return vvchParams[0].size();
}
}
CAmount CalcMinClaimTrieFee(const CTransaction& tx, const CAmount &minFeePerNameClaimChar)
{
if (minFeePerNameClaimChar == 0)
{
return 0;
}
CAmount min_fee = 0;
for (const CTxOut& txout: tx.vout)
{
int op;
std::vector<std::vector<unsigned char> > vvchParams;
if (DecodeClaimScript(txout.scriptPubKey, op, vvchParams))
{
if (op == OP_CLAIM_NAME)
{
int claim_name_size = vvchParams[0].size();
min_fee += claim_name_size*minFeePerNameClaimChar;
}
}
}
return min_fee;
}