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script.go
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script.go
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package lbrycrd
import (
"encoding/binary"
"encoding/hex"
"github.com/lbryio/chainquery/util"
"github.com/lbryio/chainquery/global"
"github.com/lbryio/lbry.go/extras/errors"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcutil"
log "github.com/sirupsen/logrus"
)
const (
//lbrycrd //btcd
opClaimName = 0xb5 //OP_NOP6 = 181
opSupportClaim = 0xb6 //OP_NOP7 = 182
opUpdateClaim = 0xb7 //OP_NOP8 = 183
opDup = 0x76 //opDup = 118
opChecksig = 0xac //opChecksig = 172
opEqualverify = 0x88 //opEqualverify = 136
opHash160 = 0xa9 //opHash160 = 169
opPushdata1 = 0x4c //opPushdata1 = 76
opPushdata2 = 0x4d //opPushdata2 = 77
opPushdata4 = 0x4e //opPushdata4 = 78
// Types of vOut scripts
p2SH = "scripthash" // Pay to Script Hash
p2PK = "pubkey" // Pay to Public Key
p2PKH = "pubkeyhash" // Pay to Public Key Hash
// NonStandard is a transaction type, usually used for a claim.
NonStandard = "nonstandard" // Non Standard - Used for Claims in LBRY
lbrycrdMainPubkeyPrefix = byte(85)
lbrycrdMainScriptPrefix = byte(122)
lbrycrdTestnetPubkeyPrefix = byte(111)
lbrycrdTestnetScriptPrefix = byte(196)
lbrycrdRegtestPubkeyPrefix = byte(111)
lbrycrdRegtestScriptPrefix = byte(196)
lbrycrdMain = "lbrycrd_main"
lbrycrdTestnet = "lbrycrd_testnet"
lbrycrdRegtest = "lbrycrd_regtest"
)
var mainNetParams = chaincfg.Params{
PubKeyHashAddrID: lbrycrdMainPubkeyPrefix,
ScriptHashAddrID: lbrycrdMainScriptPrefix,
PrivateKeyID: 0x1c,
}
var testNetParams = chaincfg.Params{
PubKeyHashAddrID: lbrycrdTestnetPubkeyPrefix,
ScriptHashAddrID: lbrycrdTestnetScriptPrefix,
PrivateKeyID: 0x1c,
}
var regTestNetParams = chaincfg.Params{
PubKeyHashAddrID: lbrycrdRegtestPubkeyPrefix,
ScriptHashAddrID: lbrycrdRegtestScriptPrefix,
PrivateKeyID: 0x1c,
}
var paramsMap = map[string]chaincfg.Params{lbrycrdMain: mainNetParams, lbrycrdTestnet: testNetParams, lbrycrdRegtest: regTestNetParams}
//GetChainParams returns the currently set blockchain name as the chain parameters. Set in the config.
func GetChainParams() (*chaincfg.Params, error) {
chainParams, ok := paramsMap[global.BlockChainName]
if !ok {
return nil, errors.Err("unknown chain name %s", global.BlockChainName)
}
return &chainParams, nil
}
// IsClaimScript return true if the script for the vout contains the right opt codes pertaining to a claim.
func IsClaimScript(script []byte) bool {
return script[0] == opSupportClaim ||
script[0] == opClaimName ||
script[0] == opUpdateClaim
}
// IsClaimNameScript returns true if the script for the vout contains the OP_CLAIM_NAME code.
func IsClaimNameScript(script []byte) bool {
if len(script) > 0 {
return script[0] == opClaimName
}
log.Error("script is nil or length 0!")
return false
}
// IsClaimSupportScript returns true if the script for the vout contains the OP_CLAIM_SUPPORT code.
func IsClaimSupportScript(script []byte) bool {
if len(script) > 0 {
return script[0] == opSupportClaim
}
return false
}
// IsClaimUpdateScript returns true if the script for the vout contains the OP_CLAIM_UPDATE code.
func IsClaimUpdateScript(script []byte) bool {
if len(script) > 0 {
return script[0] == opUpdateClaim
}
return false
}
// ParseClaimNameScript parses a script for the claim of a name.
func ParseClaimNameScript(script []byte) (name string, value []byte, pubkeyscript []byte, err error) {
// Already validated by blockchain so can be assumed
// opClaimName Name Value OP_2DROP OP_DROP pubkeyscript
nameBytesToRead := int(script[1])
nameStart := 2
if nameBytesToRead == opPushdata1 {
nameBytesToRead = int(script[2])
nameStart = 3
} else if nameBytesToRead > opPushdata1 {
panic(errors.Base("Bytes to read is more than next byte! "))
}
nameEnd := nameStart + nameBytesToRead
name = string(script[nameStart:nameEnd])
dataPushType := int(script[nameEnd])
valueBytesToRead := int(script[nameEnd])
valueStart := nameEnd + 1
if dataPushType == opPushdata1 {
valueBytesToRead = int(script[nameEnd+1])
valueStart = nameEnd + 2
} else if dataPushType == opPushdata2 {
valueStart = nameEnd + 3
valueBytesToRead = int(binary.LittleEndian.Uint16(script[nameEnd+1 : valueStart]))
} else if dataPushType == opPushdata4 {
valueStart = nameEnd + 5
valueBytesToRead = int(binary.LittleEndian.Uint32(script[nameEnd+2 : valueStart]))
}
valueEnd := valueStart + valueBytesToRead
value = script[valueStart:valueEnd]
pksStart := valueEnd + 2 // +2 to ignore OP_2DROP and OP_DROP
pubkeyscript = script[pksStart:] //Remainder is always pubkeyscript
return name, value, pubkeyscript, err
}
// ParseClaimSupportScript parses a script for a support of a claim.
func ParseClaimSupportScript(script []byte) (name string, claimid string, pubkeyscript []byte, err error) {
// Already validated by blockchain so can be assumed
// opSupportClaim vchName vchClaimId OP_2DROP OP_DROP pubkeyscript
//Name
nameBytesToRead := int(script[1])
nameStart := 2
if nameBytesToRead == opPushdata1 {
nameBytesToRead = int(script[2])
nameStart = 3
} else if nameBytesToRead > opPushdata1 {
panic(errors.Base("Bytes to read is more than next byte! "))
}
nameEnd := nameStart + nameBytesToRead
name = string(script[nameStart:nameEnd])
//ClaimID
claimidBytesToRead := int(script[nameEnd])
claimidStart := nameEnd + 1
claimidEnd := claimidStart + claimidBytesToRead
bytes := util.ReverseBytes(script[claimidStart:claimidEnd])
claimid = hex.EncodeToString(bytes)
//PubKeyScript
pksStart := claimidEnd + 2 // +2 to ignore OP_2DROP and OP_DROP
pubkeyscript = script[pksStart:] //Remainder is always pubkeyscript
return
}
// ParseClaimUpdateScript parses a script for an update of a claim.
func ParseClaimUpdateScript(script []byte) (name string, claimid string, value []byte, pubkeyscript []byte, err error) {
// opUpdateClaim Name ClaimID Value OP_2DROP OP_2DROP pubkeyscript
//Name
nameBytesToRead := int(script[1])
nameStart := 2
if nameBytesToRead == opPushdata1 {
nameBytesToRead = int(script[2])
nameStart = 3
} else if nameBytesToRead > opPushdata1 {
panic(errors.Base("Bytes to read is more than next byte! "))
}
nameEnd := nameStart + nameBytesToRead
name = string(script[nameStart:nameEnd])
//ClaimID
claimidBytesToRead := int(script[nameEnd])
claimidStart := nameEnd + 1
claimidEnd := claimidStart + claimidBytesToRead
bytes := util.ReverseBytes(script[claimidStart:claimidEnd])
claimid = hex.EncodeToString(bytes)
//Value
dataPushType := int(script[claimidEnd])
valueBytesToRead := int(script[claimidEnd])
valueStart := claimidEnd + 1
if dataPushType == opPushdata1 {
valueBytesToRead = int(script[claimidEnd+1])
valueStart = claimidEnd + 2
} else if dataPushType == opPushdata2 {
valueStart = claimidEnd + 3
valueBytesToRead = int(binary.LittleEndian.Uint16(script[claimidEnd+1 : valueStart]))
} else if dataPushType == opPushdata4 {
valueStart = claimidEnd + 5
valueBytesToRead = int(binary.LittleEndian.Uint32(script[claimidEnd+2 : valueStart]))
}
valueEnd := valueStart + valueBytesToRead
value = script[valueStart:valueEnd]
//PublicKeyScript
pksStart := valueEnd + 2 // +2 to ignore OP_2DROP and OP_DROP
pubkeyscript = script[pksStart:] //Remainder is always pubkeyscript
return name, claimid, value, pubkeyscript, err
}
// GetPubKeyScriptFromClaimPKS gets the public key script at the end of a claim script.
func GetPubKeyScriptFromClaimPKS(script []byte) (pubkeyscript []byte, err error) {
if IsClaimScript(script) {
if IsClaimNameScript(script) {
_, _, pubkeyscript, err = ParseClaimNameScript(script)
if err != nil {
return
}
return pubkeyscript, nil
} else if IsClaimUpdateScript(script) {
_, _, _, pubkeyscript, err = ParseClaimUpdateScript(script)
if err != nil {
return
}
return
} else if IsClaimSupportScript(script) {
_, _, pubkeyscript, err = ParseClaimSupportScript(script)
if err != nil {
return
}
return
}
} else {
err = errors.Base("Script is not a claim script!")
}
return
}
// GetAddressFromPublicKeyScript returns the address associated with a public key script.
func GetAddressFromPublicKeyScript(script []byte) (address string) {
spkType := getPublicKeyScriptType(script)
var err error
switch spkType {
case p2PK:
// <pubkey> opChecksig
//log.Debug("sig p2PK ", hex.EncodeToString(script[0:len(script)-1]))
address, err = getAddressFromP2PK(hex.EncodeToString(script[0 : len(script)-1]))
case p2PKH:
// opDup opHash160 <bytes2read> <PubKeyHash> opEqualverify opChecksig
//log.Debug("sig p2PKH ", hex.EncodeToString(script[3:len(script)-2]))
address, err = getAddressFromP2PKH(hex.EncodeToString(script[3 : len(script)-2]))
case p2SH:
// opHash160 <bytes2read> <Hash160(redeemScript)> OP_EQUAL
//log.Debug("sig p2SH ", hex.EncodeToString(script[2:len(script)-1]))
address, err = getAddressFromP2SH(hex.EncodeToString(script[2 : len(script)-1]))
case NonStandard:
address = "UNKNOWN"
}
if err != nil {
panic(err)
}
return address
}
func getPublicKeyScriptType(script []byte) string {
if isPayToPublicKey(script) {
return p2PK
} else if isPayToPublicKeyHashScript(script) {
return p2PKH
} else if isPayToScriptHashScript(script) {
return p2SH
}
return NonStandard
}
func isPayToScriptHashScript(script []byte) bool {
if len(script) > 0 {
return script[0] == opUpdateClaim
}
return false
}
func isPayToPublicKey(script []byte) bool {
return script[len(script)-1] == opChecksig &&
script[len(script)-2] == opEqualverify &&
script[0] != opDup
}
func isPayToPublicKeyHashScript(script []byte) bool {
return len(script) > 0 &&
script[0] == opDup &&
script[1] == opHash160
}
func getAddressFromP2PK(hexstring string) (string, error) {
hexstringBytes, err := hex.DecodeString(hexstring)
if err != nil {
return "", err
}
chainParams, err := GetChainParams()
if err != nil {
return "", errors.Err(err)
}
addr, err := btcutil.NewAddressPubKey(hexstringBytes, chainParams)
if err != nil {
return "", err
}
address := addr.EncodeAddress()
return address, nil
}
func getAddressFromP2PKH(hexstring string) (string, error) {
hexstringBytes, err := hex.DecodeString(hexstring)
if err != nil {
return "", err
}
chainParams, err := GetChainParams()
if err != nil {
return "", errors.Err(err)
}
addr, err := btcutil.NewAddressPubKeyHash(hexstringBytes, chainParams)
if err != nil {
return "", err
}
address := addr.EncodeAddress()
return address, nil
}
func getAddressFromP2SH(hexstring string) (string, error) {
hexstringBytes, err := hex.DecodeString(hexstring)
if err != nil {
return "", err
}
chainParams, err := GetChainParams()
if err != nil {
return "", errors.Err(err)
}
addr, err := btcutil.NewAddressScriptHashFromHash(hexstringBytes, chainParams)
if err != nil {
return "", err
}
address := addr.EncodeAddress()
return address, nil
}