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address.go
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address.go
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package types
import (
"encoding/hex"
"fmt"
"math/big"
"github.com/spacemeshos/go-spacemesh/common/util"
"github.com/spacemeshos/go-spacemesh/crypto/sha3"
"github.com/spacemeshos/go-spacemesh/log"
)
const (
// AddressLength is the expected length of the address.
AddressLength = 20
)
// Address represents the 20 byte address of an spacemesh account.
type Address [AddressLength]byte
// BytesToAddress returns Address with value b.
// If b is larger than len(h), b will be cropped from the left.
func BytesToAddress(b []byte) Address {
var a Address
a.SetBytes(b)
return a
}
// BigToAddress returns Address with byte values of b.
// If b is larger than len(h), b will be cropped from the left.
func BigToAddress(b *big.Int) Address { return BytesToAddress(b.Bytes()) }
// HexToAddress returns Address with byte values of s.
// If s is larger than len(h), s will be cropped from the left.
func HexToAddress(s string) Address { return BytesToAddress(util.FromHex(s)) }
// StringToAddress returns Address with byte values of s.
// If s is larger than len(h), s will be cropped from the left.
// It is identical to HexToAddress, except decoding errors are returned instead of swallowed.
func StringToAddress(s string) (Address, error) {
if len(s) > 1 {
if s[0:2] == "0x" || s[0:2] == "0X" {
s = s[2:]
}
}
if len(s)%2 == 1 {
s = "0" + s
}
bt, err := hex.DecodeString(s)
if err != nil {
return Address{}, fmt.Errorf("decode hex string: %w", err)
}
return BytesToAddress(bt), nil
}
// Bytes gets the string representation of the underlying address.
func (a Address) Bytes() []byte { return a[:] }
// Big converts an address to a big integer.
func (a Address) Big() *big.Int { return new(big.Int).SetBytes(a[:]) }
// Hash converts an address to a hash by left-padding it with zeros.
func (a Address) Hash() Hash32 { return CalcHash32(a[:]) }
// Hex returns an EIP55-compliant hex string representation of the address.
func (a Address) Hex() string {
unchecksummed := hex.EncodeToString(a[:])
sha := sha3.NewKeccak256()
sha.Write([]byte(unchecksummed))
hash := sha.Sum(nil)
result := []byte(unchecksummed)
for i := 0; i < len(result); i++ {
hashByte := hash[i/2]
if i%2 == 0 {
hashByte = hashByte >> 4
} else {
hashByte &= 0xf
}
if result[i] > '9' && hashByte > 7 {
result[i] -= 32
}
}
return "0x" + string(result)
}
// String implements fmt.Stringer.
func (a Address) String() string {
return a.Hex()
}
// Field returns a log field. Implements the LoggableField interface.
func (a Address) Field() log.Field { return log.String("address", a.String()) }
// Short returns the first 7 characters of the address hex representation (incl. "0x"), for logging purposes.
func (a Address) Short() string {
hx := a.Hex()
return hx[:util.Min(7, len(hx))]
}
// Format implements fmt.Formatter, forcing the byte slice to be formatted as is,
// without going through the stringer interface used for logging.
func (a Address) Format(s fmt.State, c rune) {
_, _ = fmt.Fprintf(s, "%"+string(c), a[:])
}
// SetBytes sets the address to the value of b.
// If b is larger than len(a) it will panic.
func (a *Address) SetBytes(b []byte) {
if len(b) > len(a) {
b = b[len(b)-AddressLength:]
}
copy(a[AddressLength-len(b):], b)
}