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https://github.com/nspcc-dev/neo-go.git
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fa09b9af7b
Follow missed change from neo-project/neo#1816 . `None` may be used for any signer. Currently it is used for sender to only pay fees, or to sign tx attributes.
106 lines
3.1 KiB
Go
106 lines
3.1 KiB
Go
package transaction
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//go:generate stringer -type=WitnessScope -output=witness_scope_string.go
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import (
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"encoding/json"
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"fmt"
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"strings"
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)
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// WitnessScope represents set of witness flags for Transaction signer.
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type WitnessScope byte
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const (
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// None specifies that no contract was witnessed. Only sign the transaction.
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None WitnessScope = 0
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// CalledByEntry means that this condition must hold: EntryScriptHash == CallingScriptHash.
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// No params is needed, as the witness/permission/signature given on first invocation will
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// automatically expire if entering deeper internal invokes. This can be default safe
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// choice for native NEO/GAS (previously used on Neo 2 as "attach" mode).
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CalledByEntry WitnessScope = 0x01
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// CustomContracts define custom hash for contract-specific.
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CustomContracts WitnessScope = 0x10
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// CustomGroups define custom pubkey for group members.
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CustomGroups WitnessScope = 0x20
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// Global allows this witness in all contexts (default Neo2 behavior).
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// This cannot be combined with other flags.
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Global WitnessScope = 0x80
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)
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// ScopesFromString converts string of comma-separated scopes to a set of scopes
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// (case-sensitive). String can combine several scopes, e.g. be any of: 'Global',
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// 'CalledByEntry,CustomGroups' etc. In case of an empty string an error will be
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// returned.
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func ScopesFromString(s string) (WitnessScope, error) {
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var result WitnessScope
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scopes := strings.Split(s, ",")
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for i, scope := range scopes {
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scopes[i] = strings.TrimSpace(scope)
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}
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dict := map[string]WitnessScope{
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Global.String(): Global,
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CalledByEntry.String(): CalledByEntry,
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CustomContracts.String(): CustomContracts,
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CustomGroups.String(): CustomGroups,
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None.String(): None,
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}
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var isGlobal bool
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for _, scopeStr := range scopes {
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scope, ok := dict[scopeStr]
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if !ok {
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return result, fmt.Errorf("invalid witness scope: %v", scopeStr)
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}
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if isGlobal && !(scope == Global) {
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return result, fmt.Errorf("Global scope can not be combined with other scopes")
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}
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result |= scope
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if scope == Global {
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isGlobal = true
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}
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}
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return result, nil
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}
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// scopesToString converts witness scope to it's string representation. It uses
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// `, ` to separate scope names.
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func scopesToString(scopes WitnessScope) string {
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if scopes&Global != 0 || scopes == None {
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return scopes.String()
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}
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var res string
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if scopes&CalledByEntry != 0 {
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res = CalledByEntry.String()
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}
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if scopes&CustomContracts != 0 {
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if len(res) != 0 {
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res += ", "
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}
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res += CustomContracts.String()
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}
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if scopes&CustomGroups != 0 {
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if len(res) != 0 {
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res += ", "
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}
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res += CustomGroups.String()
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}
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return res
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}
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// MarshalJSON implements json.Marshaler interface.
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func (s WitnessScope) MarshalJSON() ([]byte, error) {
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return []byte(`"` + scopesToString(s) + `"`), nil
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}
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// UnmarshalJSON implements json.Unmarshaler interface.
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func (s *WitnessScope) UnmarshalJSON(data []byte) error {
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var js string
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if err := json.Unmarshal(data, &js); err != nil {
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return err
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}
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scopes, err := ScopesFromString(js)
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if err != nil {
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return err
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}
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*s = scopes
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return nil
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}
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