[lbry] txscript: introduce claim script
Co-authored-by: Brannon King <countprimes@gmail.com>
This commit is contained in:
Roy Lee
parent
185cb711b5
commit
6d80d906a8
2 changed files with 296 additions and 0 deletions
216
txscript/claimscript.go
Normal file
216
txscript/claimscript.go
Normal file
|
|
@ -0,0 +1,216 @@
|
|||
package txscript
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"unicode/utf8"
|
||||
)
|
||||
|
||||
const (
|
||||
// MaxClaimScriptSize is the max claim script size in bytes, not including the script pubkey part of the script.
|
||||
MaxClaimScriptSize = 8192
|
||||
|
||||
// MaxClaimNameSize is the max claim name size in bytes, for all claim trie transactions.
|
||||
MaxClaimNameSize = 255
|
||||
|
||||
ClaimIDLength = 160 / 8
|
||||
|
||||
claimScriptVersion = 0
|
||||
)
|
||||
|
||||
// These constants are used to identify a specific claim script Error.
|
||||
// The error code starts from 200, which leaves enough room between the rest
|
||||
// of script error codes (numErrorCodes)
|
||||
const (
|
||||
// ErrNotClaimScript is returned when the script does not have a ClaimScript Opcode.
|
||||
ErrNotClaimScript ErrorCode = iota + 200
|
||||
|
||||
// ErrInvalidClaimNameScript is returned a claim name script does not conform to the format.
|
||||
ErrInvalidClaimNameScript
|
||||
|
||||
// ErrInvalidClaimSupportScript is returned a claim support script does not conform to the format.
|
||||
ErrInvalidClaimSupportScript
|
||||
|
||||
// ErrInvalidClaimUpdateScript is returned a claim update script does not conform to the format.
|
||||
ErrInvalidClaimUpdateScript
|
||||
)
|
||||
|
||||
func claimScriptError(c ErrorCode, desc string) Error {
|
||||
return Error{ErrorCode: c, Description: desc}
|
||||
}
|
||||
|
||||
// ClaimNameScript creates a claim name script.
|
||||
func ClaimNameScript(name string, value string) ([]byte, error) {
|
||||
return NewScriptBuilder().AddOp(OP_CLAIMNAME).AddData([]byte(name)).AddData([]byte(value)).
|
||||
AddOp(OP_2DROP).AddOp(OP_DROP).AddOp(OP_TRUE).Script()
|
||||
}
|
||||
|
||||
// ClaimSupportScript creates a support claim script.
|
||||
func ClaimSupportScript(name string, claimID []byte, value []byte) ([]byte, error) {
|
||||
builder := NewScriptBuilder().AddOp(OP_SUPPORTCLAIM).AddData([]byte(name)).AddData(claimID)
|
||||
if len(value) > 0 {
|
||||
return builder.addData(value).AddOp(OP_2DROP).AddOp(OP_2DROP).AddOp(OP_TRUE).Script()
|
||||
}
|
||||
return builder.AddOp(OP_2DROP).AddOp(OP_DROP).AddOp(OP_TRUE).Script()
|
||||
}
|
||||
|
||||
// ClaimUpdateScript creates an update claim script.
|
||||
func ClaimUpdateScript(name string, claimID []byte, value string) ([]byte, error) {
|
||||
return NewScriptBuilder().AddOp(OP_UPDATECLAIM).AddData([]byte(name)).AddData(claimID).AddData([]byte(value)).
|
||||
AddOp(OP_2DROP).AddOp(OP_2DROP).AddOp(OP_TRUE).Script()
|
||||
}
|
||||
|
||||
// ClaimScript represents of one of the ClaimNameScript, ClaimSupportScript, and ClaimUpdateScript.
|
||||
type ClaimScript struct {
|
||||
Opcode byte
|
||||
Name []byte
|
||||
ClaimID []byte
|
||||
Value []byte
|
||||
Size int
|
||||
}
|
||||
|
||||
// ExtractClaimScript exctracts the claim script from the script if it has one.
|
||||
// The returned ClaimScript is invalidated if the given script is modified.
|
||||
func ExtractClaimScript(script []byte) (*ClaimScript, error) {
|
||||
|
||||
var cs ClaimScript
|
||||
|
||||
tokenizer := MakeScriptTokenizer(claimScriptVersion, script)
|
||||
if !tokenizer.Next() {
|
||||
return nil, claimScriptError(ErrNotClaimScript, "not a claim script opcode")
|
||||
}
|
||||
|
||||
cs.Opcode = tokenizer.Opcode()
|
||||
|
||||
switch tokenizer.Opcode() {
|
||||
case OP_CLAIMNAME:
|
||||
// OP_CLAIMNAME <Name> <Value> OP_2DROP OP_DROP <P2PKH>
|
||||
if !tokenizer.Next() || len(tokenizer.Data()) > MaxClaimNameSize {
|
||||
str := fmt.Sprintf("name size %d exceeds limit %d", len(tokenizer.data), MaxClaimNameSize)
|
||||
return nil, claimScriptError(ErrInvalidClaimNameScript, str)
|
||||
}
|
||||
cs.Name = tokenizer.data
|
||||
|
||||
if !tokenizer.Next() {
|
||||
return nil, claimScriptError(ErrInvalidClaimNameScript, "expect value")
|
||||
}
|
||||
cs.Value = tokenizer.Data()
|
||||
|
||||
if !tokenizer.Next() || tokenizer.Opcode() != OP_2DROP ||
|
||||
!tokenizer.Next() || tokenizer.Opcode() != OP_DROP {
|
||||
str := fmt.Sprintf("expect OP_2DROP OP_DROP")
|
||||
return nil, claimScriptError(ErrInvalidClaimNameScript, str)
|
||||
}
|
||||
|
||||
cs.Size = int(tokenizer.ByteIndex())
|
||||
return &cs, nil
|
||||
|
||||
case OP_SUPPORTCLAIM:
|
||||
// OP_SUPPORTCLAIM <Name> <ClaimID> OP_2DROP OP_DROP <P2PKH>
|
||||
// OP_SUPPORTCLAIM <Name> <ClaimID> <Value> OP_2DROP OP_2DROP <P2PKH>
|
||||
if !tokenizer.Next() || len(tokenizer.Data()) > MaxClaimNameSize {
|
||||
str := fmt.Sprintf("name size %d exceeds limit %d", len(tokenizer.data), MaxClaimNameSize)
|
||||
return nil, claimScriptError(ErrInvalidClaimSupportScript, str)
|
||||
}
|
||||
cs.Name = tokenizer.data
|
||||
|
||||
if !tokenizer.Next() || len(tokenizer.Data()) != ClaimIDLength {
|
||||
str := fmt.Sprintf("expect claim id length %d, instead of %d", ClaimIDLength, len(tokenizer.data))
|
||||
return nil, claimScriptError(ErrInvalidClaimSupportScript, str)
|
||||
}
|
||||
cs.ClaimID = tokenizer.Data()
|
||||
|
||||
if !tokenizer.Next() {
|
||||
return nil, claimScriptError(ErrInvalidClaimSupportScript, "incomplete script")
|
||||
}
|
||||
|
||||
switch {
|
||||
case tokenizer.Opcode() == OP_2DROP:
|
||||
// Case 1: OP_SUPPORTCLAIM <Name> <ClaimID> OP_2DROP OP_DROP <P2PKH>
|
||||
if !tokenizer.Next() || tokenizer.Opcode() != OP_DROP {
|
||||
str := fmt.Sprintf("expect OP_2DROP OP_DROP")
|
||||
return nil, claimScriptError(ErrInvalidClaimSupportScript, str)
|
||||
}
|
||||
|
||||
case len(tokenizer.Data()) != 0:
|
||||
// Case 2: OP_SUPPORTCLAIM <Name> <ClaimID> <Dummy Value> OP_2DROP OP_2DROP <P2PKH>
|
||||
// (old bug: non-length size dummy value?)
|
||||
cs.Value = tokenizer.Data()
|
||||
if !tokenizer.Next() || tokenizer.Opcode() != OP_2DROP ||
|
||||
!tokenizer.Next() || tokenizer.Opcode() != OP_2DROP {
|
||||
str := fmt.Sprintf("expect OP_2DROP OP_2DROP")
|
||||
return nil, claimScriptError(ErrInvalidClaimSupportScript, str)
|
||||
}
|
||||
default:
|
||||
str := fmt.Sprintf("expect OP_2DROP OP_DROP")
|
||||
return nil, claimScriptError(ErrInvalidClaimSupportScript, str)
|
||||
}
|
||||
|
||||
cs.Size = int(tokenizer.ByteIndex())
|
||||
return &cs, nil
|
||||
|
||||
case OP_UPDATECLAIM:
|
||||
|
||||
// OP_UPDATECLAIM <Name> <ClaimID> <Value> OP_2DROP OP_2DROP <P2PKH>
|
||||
if !tokenizer.Next() || len(tokenizer.Data()) > MaxClaimNameSize {
|
||||
str := fmt.Sprintf("name size %d exceeds limit %d", len(tokenizer.data), MaxClaimNameSize)
|
||||
return nil, claimScriptError(ErrInvalidClaimUpdateScript, str)
|
||||
}
|
||||
cs.Name = tokenizer.data
|
||||
|
||||
if !tokenizer.Next() || len(tokenizer.Data()) != ClaimIDLength {
|
||||
str := fmt.Sprintf("expect claim id length %d, instead of %d", ClaimIDLength, len(tokenizer.data))
|
||||
return nil, claimScriptError(ErrInvalidClaimUpdateScript, str)
|
||||
}
|
||||
cs.ClaimID = tokenizer.Data()
|
||||
|
||||
if !tokenizer.Next() {
|
||||
str := fmt.Sprintf("expect value")
|
||||
return nil, claimScriptError(ErrInvalidClaimUpdateScript, str)
|
||||
}
|
||||
cs.Value = tokenizer.Data()
|
||||
|
||||
if !tokenizer.Next() || tokenizer.Opcode() != OP_2DROP ||
|
||||
!tokenizer.Next() || tokenizer.Opcode() != OP_2DROP {
|
||||
str := fmt.Sprintf("expect OP_2DROP OP_2DROP")
|
||||
return nil, claimScriptError(ErrInvalidClaimUpdateScript, str)
|
||||
}
|
||||
|
||||
cs.Size = int(tokenizer.ByteIndex())
|
||||
return &cs, nil
|
||||
|
||||
default:
|
||||
return nil, claimScriptError(ErrNotClaimScript, "")
|
||||
}
|
||||
}
|
||||
|
||||
// StripClaimScriptPrefix strips prefixed claim script, if any.
|
||||
func StripClaimScriptPrefix(script []byte) []byte {
|
||||
cs, err := ExtractClaimScript(script)
|
||||
if err != nil {
|
||||
return script
|
||||
}
|
||||
return script[cs.Size:]
|
||||
}
|
||||
|
||||
const illegalChars = "=&#:*$%?/;\\\b\n\t\r\x00"
|
||||
|
||||
func AllClaimsAreSane(script []byte, enforceSoftFork bool) error {
|
||||
cs, err := ExtractClaimScript(script)
|
||||
if IsErrorCode(err, ErrNotClaimScript) {
|
||||
return nil
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if enforceSoftFork {
|
||||
if !utf8.Valid(cs.Name) {
|
||||
return fmt.Errorf("claim name is not valid UTF-8")
|
||||
}
|
||||
if bytes.ContainsAny(cs.Name, illegalChars) {
|
||||
return fmt.Errorf("claim name has illegal chars; it should not contain any of these: %s", illegalChars)
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
80
txscript/claimscript_test.go
Normal file
80
txscript/claimscript_test.go
Normal file
|
|
@ -0,0 +1,80 @@
|
|||
package txscript
|
||||
|
||||
import (
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
||||
|
||||
func TestCreationParseLoopClaim(t *testing.T) {
|
||||
|
||||
r := require.New(t)
|
||||
|
||||
// OP_CLAIMNAME <Name> <Value> OP_2DROP OP_DROP <P2PKH>
|
||||
script, err := ClaimNameScript("tester", "value")
|
||||
r.NoError(err)
|
||||
cs, err := ExtractClaimScript(script)
|
||||
r.NoError(err)
|
||||
r.Equal(byte(OP_CLAIMNAME), cs.Opcode)
|
||||
r.Equal([]byte("tester"), cs.Name)
|
||||
r.Equal([]byte("value"), cs.Value)
|
||||
}
|
||||
|
||||
func TestCreationParseLoopUpdate(t *testing.T) {
|
||||
|
||||
r := require.New(t)
|
||||
|
||||
claimID := []byte("12345123451234512345")
|
||||
claim, err := ClaimUpdateScript("tester", claimID, "value")
|
||||
r.NoError(err)
|
||||
cs, err := ExtractClaimScript(claim)
|
||||
r.NoError(err)
|
||||
r.Equal(byte(OP_UPDATECLAIM), cs.Opcode)
|
||||
r.Equal([]byte("tester"), cs.Name)
|
||||
r.Equal(claimID, cs.ClaimID)
|
||||
r.Equal([]byte("value"), cs.Value)
|
||||
}
|
||||
|
||||
func TestCreationParseLoopSupport(t *testing.T) {
|
||||
|
||||
r := require.New(t)
|
||||
|
||||
claimID := []byte("12345123451234512345")
|
||||
|
||||
// case 1: OP_SUPPORTCLAIM <Name> <ClaimID> OP_2DROP OP_DROP <P2PKH>
|
||||
script, err := ClaimSupportScript("tester", claimID, nil)
|
||||
r.NoError(err)
|
||||
cs, err := ExtractClaimScript(script)
|
||||
r.NoError(err)
|
||||
|
||||
r.Equal(byte(OP_SUPPORTCLAIM), cs.Opcode)
|
||||
r.Equal([]byte("tester"), cs.Name)
|
||||
r.Equal(claimID, cs.ClaimID)
|
||||
r.Nil(cs.Value)
|
||||
|
||||
// case 2: OP_SUPPORTCLAIM <Name> <ClaimID> <Value> OP_2DROP OP_2DROP <P2PKH>
|
||||
script, err = ClaimSupportScript("tester", claimID, []byte("value"))
|
||||
r.NoError(err)
|
||||
cs, err = ExtractClaimScript(script)
|
||||
r.NoError(err)
|
||||
|
||||
r.Equal(byte(OP_SUPPORTCLAIM), cs.Opcode)
|
||||
r.Equal([]byte("tester"), cs.Name)
|
||||
r.Equal(claimID, cs.ClaimID)
|
||||
r.Equal([]byte("value"), cs.Value)
|
||||
|
||||
}
|
||||
|
||||
func TestInvalidChars(t *testing.T) {
|
||||
r := require.New(t)
|
||||
|
||||
script, err := ClaimNameScript("tester", "value")
|
||||
r.NoError(err)
|
||||
r.NoError(AllClaimsAreSane(script, true))
|
||||
|
||||
for i := range []byte(illegalChars) {
|
||||
script, err := ClaimNameScript("a"+illegalChars[i:i+1], "value")
|
||||
r.NoError(err)
|
||||
r.Error(AllClaimsAreSane(script, true))
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue