neoneo-go/pkg/core/transaction/signer.go

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package transaction
import (
"errors"
"math/big"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// The maximum number of AllowedContracts or AllowedGroups.
const maxSubitems = 16
// Signer implements a Transaction signer.
type Signer struct {
Account util.Uint160 `json:"account"`
Scopes WitnessScope `json:"scopes"`
AllowedContracts []util.Uint160 `json:"allowedcontracts,omitempty"`
AllowedGroups []*keys.PublicKey `json:"allowedgroups,omitempty"`
Rules []WitnessRule `json:"rules,omitempty"`
}
// EncodeBinary implements the Serializable interface.
func (c *Signer) EncodeBinary(bw *io.BinWriter) {
bw.WriteBytes(c.Account[:])
bw.WriteB(byte(c.Scopes))
if c.Scopes&CustomContracts != 0 {
bw.WriteArray(c.AllowedContracts)
}
if c.Scopes&CustomGroups != 0 {
bw.WriteArray(c.AllowedGroups)
}
if c.Scopes&Rules != 0 {
bw.WriteArray(c.Rules)
}
}
// DecodeBinary implements the Serializable interface.
func (c *Signer) DecodeBinary(br *io.BinReader) {
br.ReadBytes(c.Account[:])
c.Scopes = WitnessScope(br.ReadB())
if c.Scopes & ^(Global|CalledByEntry|CustomContracts|CustomGroups|Rules|None) != 0 {
br.Err = errors.New("unknown witness scope")
return
}
if c.Scopes&Global != 0 && c.Scopes != Global {
br.Err = errors.New("global scope can not be combined with other scopes")
return
}
if c.Scopes&CustomContracts != 0 {
br.ReadArray(&c.AllowedContracts, maxSubitems)
}
if c.Scopes&CustomGroups != 0 {
br.ReadArray(&c.AllowedGroups, maxSubitems)
}
if c.Scopes&Rules != 0 {
br.ReadArray(&c.Rules, maxSubitems)
}
}
// SignersToStackItem converts transaction.Signers to stackitem.Item.
func SignersToStackItem(signers []Signer) stackitem.Item {
res := make([]stackitem.Item, len(signers))
for i, s := range signers {
contracts := make([]stackitem.Item, len(s.AllowedContracts))
for j, c := range s.AllowedContracts {
contracts[j] = stackitem.NewByteArray(c.BytesBE())
}
groups := make([]stackitem.Item, len(s.AllowedGroups))
for j, g := range s.AllowedGroups {
groups[j] = stackitem.NewByteArray(g.Bytes())
}
rules := make([]stackitem.Item, len(s.Rules))
for j, r := range s.Rules {
rules[j] = r.ToStackItem()
}
res[i] = stackitem.NewArray([]stackitem.Item{
stackitem.NewByteArray(s.Account.BytesBE()),
stackitem.NewBigInteger(big.NewInt(int64(s.Scopes))),
stackitem.NewArray(contracts),
stackitem.NewArray(groups),
stackitem.NewArray(rules),
})
}
return stackitem.NewArray(res)
}
// Copy creates a deep copy of the Signer.
func (c *Signer) Copy() *Signer {
if c == nil {
return nil
}
cp := *c
if c.AllowedContracts != nil {
cp.AllowedContracts = make([]util.Uint160, len(c.AllowedContracts))
copy(cp.AllowedContracts, c.AllowedContracts)
}
cp.AllowedGroups = keys.PublicKeys(c.AllowedGroups).Copy()
if c.Rules != nil {
cp.Rules = make([]WitnessRule, len(c.Rules))
for i, rule := range c.Rules {
cp.Rules[i] = *rule.Copy()
}
}
return &cp
}