validator.go

package bananogo

import (
	"golang.org/x/crypto/blake2b"
	"regexp"
	"strings"
)

// AddressIsValid checks if the wallet address is valid,
// address: the wallet address to check,
// returns true if the wallet address is valid, false otherwise.
func AddressIsValid(address string) bool {
	if address == "" {
		return false
	}

	if len(address) != 64 {
		return false
	}

	pattern := `^(ban)_[13]{1}[13456789abcdefghijkmnopqrstuwxyz]{59}$`
	re := regexp.MustCompile(pattern)

	if !re.MatchString(address) {
		return false
	}

	pubKey, err := AddressToPublicKey(address)

	if err != nil {
		return false
	}

	withoutPrefix := strings.ReplaceAll(address, "ban_", "")
	origSum := withoutPrefix[len(withoutPrefix)-8 : len(withoutPrefix)]
	h, err := blake2b.New(5, nil)

	if err != nil {
		return false
	}

	h.Write(pubKey[:])

	sumBytes := h.Sum(nil)
	sum := base32Encode(revertBytes(sumBytes[:5]))

	return sum == origSum[len(origSum)-len(sum):]
}