mirror of https://github.com/poanetwork/gecko.git
116 lines
3.1 KiB
Go
116 lines
3.1 KiB
Go
// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package spchainvm
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/ava-labs/gecko/ids"
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"github.com/ava-labs/gecko/snow"
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"github.com/ava-labs/gecko/utils/crypto"
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"github.com/ava-labs/gecko/utils/formatting"
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)
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var (
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errUnknownAccount = errors.New("unknown account")
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)
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// Keychain is a collection of keys that can be used to spend utxos
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type Keychain struct {
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factory crypto.FactorySECP256K1R
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networkID uint32
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chainID ids.ID
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// Key: The id of a private key (namely, [privKey].PublicKey().Address().Key())
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// Value: The index in Keys of that private key
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keyMap map[[20]byte]int
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// Each element is an address controlled by a key in [Keys]
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// This can be used to iterate over. It should not be modified externally.
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Addrs ids.ShortSet
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// List of keys this keychain manages
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// This can be used to iterate over. It should not be modified externally.
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Keys []*crypto.PrivateKeySECP256K1R
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}
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// NewKeychain creates a new keychain for a chain
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func NewKeychain(networkID uint32, chainID ids.ID) *Keychain {
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return &Keychain{
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networkID: networkID,
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chainID: chainID,
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keyMap: make(map[[20]byte]int),
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}
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}
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// New returns a newly generated private key
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func (kc *Keychain) New() (*crypto.PrivateKeySECP256K1R, error) {
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skGen, err := kc.factory.NewPrivateKey()
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if err != nil {
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return nil, err
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}
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sk := skGen.(*crypto.PrivateKeySECP256K1R)
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kc.Add(sk)
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return sk, nil
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}
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// Add a new key to the key chain
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func (kc *Keychain) Add(key *crypto.PrivateKeySECP256K1R) {
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addr := key.PublicKey().Address()
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addrHash := addr.Key()
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if _, ok := kc.keyMap[addrHash]; !ok {
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kc.keyMap[addrHash] = len(kc.Keys)
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kc.Keys = append(kc.Keys, key)
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kc.Addrs.Add(addr)
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}
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}
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// Get a key from the keychain. If the key is unknown, the
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func (kc *Keychain) Get(id ids.ShortID) (*crypto.PrivateKeySECP256K1R, bool) {
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if i, ok := kc.keyMap[id.Key()]; ok {
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return kc.Keys[i], true
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}
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return &crypto.PrivateKeySECP256K1R{}, false
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}
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// Addresses returns a list of addresses this keychain manages
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func (kc *Keychain) Addresses() ids.ShortSet { return kc.Addrs }
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// Spend attempts to create a new transaction
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func (kc *Keychain) Spend(account Account, amount uint64, destination ids.ShortID) (*Tx, Account, error) {
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key, exists := kc.Get(account.ID())
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if !exists {
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return nil, Account{}, errUnknownAccount
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}
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ctx := snow.DefaultContextTest()
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ctx.NetworkID = kc.networkID
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ctx.ChainID = kc.chainID
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return account.CreateTx(amount, destination, ctx, key)
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}
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// PrefixedString returns a string representation of this keychain with each
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// line prepended with [prefix]
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func (kc *Keychain) PrefixedString(prefix string) string {
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s := strings.Builder{}
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format := fmt.Sprintf("%%sKey[%s]: Key: %%s Address: %%s\n",
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formatting.IntFormat(len(kc.Keys)-1))
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for i, key := range kc.Keys {
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s.WriteString(fmt.Sprintf(format,
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prefix,
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i,
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formatting.CB58{Bytes: key.Bytes()},
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key.PublicKey().Address()))
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}
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return strings.TrimSuffix(s.String(), "\n")
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}
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func (kc *Keychain) String() string {
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return kc.PrefixedString("")
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}
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