/
script.go
170 lines (145 loc) · 5.98 KB
/
script.go
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package lbrycrd
import (
"encoding/binary"
"encoding/hex"
"github.com/lbryio/lbcd/txscript"
"github.com/lbryio/lbcutil"
"github.com/cockroachdb/errors"
)
func GetClaimSupportPayoutScript(name, claimid string, address lbcutil.Address) ([]byte, error) {
//OP_SUPPORT_CLAIM <name> <claimid> OP_2DROP OP_DROP OP_DUP OP_HASH160 <address> OP_EQUALVERIFY OP_CHECKSIG
pkscript, err := txscript.PayToAddrScript(address)
if err != nil {
return nil, errors.WithStack(err)
}
bytes, err := hex.DecodeString(claimid)
if err != nil {
return nil, errors.WithStack(err)
}
return txscript.NewScriptBuilder().
AddOp(txscript.OP_SUPPORTCLAIM). //OP_SUPPORT_CLAIM
AddData([]byte(name)). //<name>
AddData(rev(bytes)). //<claimid>
AddOp(txscript.OP_2DROP). //OP_2DROP
AddOp(txscript.OP_DROP). //OP_DROP
AddOps(pkscript). //OP_DUP OP_HASH160 <address> OP_EQUALVERIFY OP_CHECKSIG
Script()
}
func GetClaimNamePayoutScript(name string, value []byte, address lbcutil.Address) ([]byte, error) {
//OP_CLAIM_NAME <name> <value> OP_2DROP OP_DROP OP_DUP OP_HASH160 <address> OP_EQUALVERIFY OP_CHECKSIG
pkscript, err := txscript.PayToAddrScript(address)
if err != nil {
return nil, errors.WithStack(err)
}
return txscript.NewScriptBuilder().
AddOp(txscript.OP_CLAIMNAME). //OP_CLAIMNAME
AddData([]byte(name)). //<name>
AddData(value). //<value>
AddOp(txscript.OP_2DROP). //OP_2DROP
AddOp(txscript.OP_DROP). //OP_DROP
AddOps(pkscript). //OP_DUP OP_HASH160 <address> OP_EQUALVERIFY OP_CHECKSIG
Script()
}
func GetUpdateClaimPayoutScript(name, claimid string, value []byte, address lbcutil.Address) ([]byte, error) {
//OP_UPDATE_CLAIM <name> <claimid> <value> OP_2DROP OP_DROP OP_DUP OP_HASH160 <address> OP_EQUALVERIFY OP_CHECKSIG
pkscript, err := txscript.PayToAddrScript(address)
if err != nil {
return nil, errors.WithStack(err)
}
bytes, err := hex.DecodeString(claimid)
if err != nil {
return nil, errors.WithStack(err)
}
return txscript.NewScriptBuilder().
AddOp(txscript.OP_UPDATECLAIM). //OP_UPDATE_CLAIM
AddData([]byte(name)). //<name>
AddData(rev(bytes)). //<claimid>
AddData(value). //<value>
AddOp(txscript.OP_2DROP). //OP_2DROP
AddOp(txscript.OP_DROP). //OP_DROP
AddOps(pkscript). //OP_DUP OP_HASH160 <address> OP_EQUALVERIFY OP_CHECKSIG
Script()
}
// IsClaimNameScript returns true if the script for the vout contains the OP_CLAIM_NAME code.
func IsClaimNameScript(script []byte) bool {
return len(script) > 0 && script[0] == txscript.OP_CLAIMNAME
}
// IsClaimUpdateScript returns true if the script for the vout contains the OP_CLAIM_UPDATE code.
func IsClaimUpdateScript(script []byte) bool {
return len(script) > 0 && script[0] == txscript.OP_UPDATECLAIM
}
// 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 == txscript.OP_PUSHDATA1 {
nameBytesToRead = int(script[2])
nameStart = 3
} else if nameBytesToRead > txscript.OP_PUSHDATA1 {
return "", nil, nil, errors.WithStack(errors.New("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 == txscript.OP_PUSHDATA1 {
valueBytesToRead = int(script[nameEnd+1])
valueStart = nameEnd + 2
} else if dataPushType == txscript.OP_PUSHDATA2 {
valueStart = nameEnd + 3
valueBytesToRead = int(binary.LittleEndian.Uint16(script[nameEnd+1 : valueStart]))
} else if dataPushType == txscript.OP_PUSHDATA4 {
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
}
// 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 == txscript.OP_PUSHDATA1 {
nameBytesToRead = int(script[2])
nameStart = 3
} else if nameBytesToRead > txscript.OP_PUSHDATA1 {
err = errors.WithStack(errors.New("ParseClaimUpdateScript: Bytes to read is more than next byte! "))
return
}
nameEnd := nameStart + nameBytesToRead
name = string(script[nameStart:nameEnd])
//ClaimID
claimidBytesToRead := int(script[nameEnd])
claimidStart := nameEnd + 1
claimidEnd := claimidStart + claimidBytesToRead
bytes := rev(script[claimidStart:claimidEnd])
claimid = hex.EncodeToString(bytes)
//Value
dataPushType := int(script[claimidEnd])
valueBytesToRead := int(script[claimidEnd])
valueStart := claimidEnd + 1
if dataPushType == txscript.OP_PUSHDATA1 {
valueBytesToRead = int(script[claimidEnd+1])
valueStart = claimidEnd + 2
} else if dataPushType == txscript.OP_PUSHDATA2 {
valueStart = claimidEnd + 3
valueBytesToRead = int(binary.LittleEndian.Uint16(script[claimidEnd+1 : valueStart]))
} else if dataPushType == txscript.OP_PUSHDATA4 {
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
}