Last modified: 2024-09-14

Helper functions

There are some functions that don't quite fit into another topic. They will be referenced as helper.X in other topics

Retrieving the Owner ID

If you have the public key of a wallet you can determine the ownerID

Libraries

"github.com/nspcc-dev/neofs-sdk-go/owner"

func OwnerIDFromPrivateKey(key *ecdsa.PrivateKey) (*owner.ID, error) {
    return OwnerIDFromPublicKey(&key.PublicKey)
}

func OwnerIDFromPublicKey(key *ecdsa.PublicKey) (*owner.ID, error) {
    return owner.NewIDFromPublicKey(key), nil
}

Convert String to Uin160

Convert a string format Neo (3) address into a uint160 . This is the format required for making transfers

// StringToUint160 attempts to decode the given NEO address string
// into an Uint160.
const NEO3Prefix byte = 0x35
func StringToUint160(s string) (u util.Uint160, err error) {
    b, err := base58.CheckDecode(s)
    if err != nil {
        return u, err
    }
    if b[0] != NEO3Prefix {
        return u, errors.New("wrong address prefix")
    }
    return util.Uint160DecodeBytesBE(b[1:21])
}

Get credentials from path

This returns the private key, which anything can be derived from, with regards to a wallet

// GetCredentialsFromPath retrieves the private key from a wallet file 
func GetCredentialsFromPath(path, address, password string) (*ecdsa.PrivateKey, error) {
w, err := wallet.NewWalletFromFile(path)
if err != nil {
    return nil, fmt.Errorf("can't read the wallet: %walletPath", err)
}

var (
    err  error
)
addr := w.GetChangeAddress() //default address

acc := w.GetAccount(addr)
if acc == nil {
    return nil, fmt.Errorf("invalid wallet address %s: %w", addrStr, err)
}

if err := acc.Decrypt(password, keys.NEP2ScryptParams()); err != nil {
    return nil, errors.New("[decrypt] invalid password - " + err.Error())
}

return &acc.PrivateKey().PrivateKey, nil

}

Calculate Epochs

This is a very simple estimation of calculating the total amount of epochs at at some point in the future

func CalculateEpochsForTime(currentEpoch uint64, durationInSeconds , msPerEpoch int64) uint64 {
    durationInEpochs := durationInSeconds/(msPerEpoch/1000) //in seconds
    return currentEpoch + uint64(durationInEpochs) // (estimate)
}