mirror of https://github.com/poanetwork/gecko.git
72 lines
1.5 KiB
Go
72 lines
1.5 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 formatting
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import (
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"bytes"
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"errors"
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"github.com/mr-tron/base58/base58"
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"github.com/ava-labs/gecko/utils/hashing"
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)
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var (
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errMissingQuotes = errors.New("missing quotes")
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errMissingChecksum = errors.New("input string is smaller than the checksum size")
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errBadChecksum = errors.New("invalid input checksum")
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)
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// CB58 formats bytes in checksummed base-58 encoding
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type CB58 struct{ Bytes []byte }
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// UnmarshalJSON ...
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func (cb58 *CB58) UnmarshalJSON(b []byte) error {
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str := string(b)
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if str == "null" {
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return nil
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}
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if len(str) < 2 {
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return errMissingQuotes
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}
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lastIndex := len(str) - 1
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if str[0] != '"' || str[lastIndex] != '"' {
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return errMissingQuotes
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}
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return cb58.FromString(str[1:lastIndex])
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}
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// MarshalJSON ...
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func (cb58 CB58) MarshalJSON() ([]byte, error) { return []byte("\"" + cb58.String() + "\""), nil }
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// FromString ...
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func (cb58 *CB58) FromString(str string) error {
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b, err := base58.Decode(str)
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if err != nil {
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return err
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}
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if len(b) < 4 {
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return errMissingChecksum
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}
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rawBytes := b[:len(b)-4]
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checksum := b[len(b)-4:]
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if !bytes.Equal(checksum, hashing.Checksum(rawBytes, 4)) {
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return errBadChecksum
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}
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cb58.Bytes = rawBytes
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return nil
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}
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func (cb58 CB58) String() string {
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checked := make([]byte, len(cb58.Bytes)+4)
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copy(checked, cb58.Bytes)
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copy(checked[len(cb58.Bytes):], hashing.Checksum(cb58.Bytes, 4))
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return base58.Encode(checked)
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}
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