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strings.go
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/
strings.go
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package ens
import (
"encoding/hex"
"fmt"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
)
func nameHash(name string) common.Hash {
node := common.Hash{}
if len(name) > 0 {
labels := strings.Split(name, ".")
for i := len(labels) - 1; i >= 0; i-- {
labelSha := crypto.Keccak256Hash([]byte(labels[i]))
node = crypto.Keccak256Hash(node.Bytes(), labelSha.Bytes())
}
}
return node
}
func validateENSUsername(username string) error {
if !strings.HasSuffix(username, ".eth") {
return fmt.Errorf("username must end with .eth")
}
return nil
}
func usernameToLabel(username string) [32]byte {
usernameHashed := crypto.Keccak256([]byte(username))
var label [32]byte
copy(label[:], usernameHashed)
return label
}
func extractCoordinates(pubkey string) ([32]byte, [32]byte) {
x, _ := hex.DecodeString(pubkey[4:68])
y, _ := hex.DecodeString(pubkey[68:132])
var xByte [32]byte
copy(xByte[:], x)
var yByte [32]byte
copy(yByte[:], y)
return xByte, yByte
}