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validation.go
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validation.go
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package eos
import (
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"regexp"
"strings"
"github.com/MixinNetwork/mixin/crypto"
"github.com/gofrs/uuid"
)
var (
EOSChainBase string
EOSChainId crypto.Hash
)
func init() {
EOSChainBase = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d"
EOSChainId = crypto.NewHash([]byte(EOSChainBase))
}
func VerifyAssetKey(assetKey string) error {
parts := strings.Split(assetKey, ":")
if len(parts) != 2 {
return fmt.Errorf("invalid eos asset key %s", assetKey)
}
account, symbol := parts[0], parts[1]
err := VerifyAddress(account)
if err != nil {
return err
}
if len(symbol) > 8 {
return fmt.Errorf("invalid eos asset key %s", assetKey)
}
return nil
}
func VerifyAddress(address string) error {
if strings.TrimSpace(address) != address {
return fmt.Errorf("invalid eos address %s", address)
}
if strings.ToLower(address) != address {
return fmt.Errorf("invalid eos address %s", address)
}
dot := strings.Index(address, ".")
if dot == 0 || dot == len(address)-1 {
return fmt.Errorf("invalid eos address %s", address)
}
if dot > 0 {
address = address[:dot] + address[dot+1:]
}
dot = strings.Index(address, ".")
if dot >= 0 {
return fmt.Errorf("invalid eos address %s", address)
}
if len(address) > 12 {
return fmt.Errorf("invalid eos address %s", address)
}
matched, err := regexp.MatchString("^[a-z1-5]{1,12}$", address)
if err != nil || !matched {
return fmt.Errorf("invalid eos address %s", address)
}
return nil
}
func VerifyTransactionHash(hash string) error {
if len(hash) != 64 {
return fmt.Errorf("invalid eos transaction hash %s", hash)
}
if strings.ToLower(hash) != hash {
return fmt.Errorf("invalid eos transaction hash %s", hash)
}
h, err := hex.DecodeString(hash)
if err != nil {
return fmt.Errorf("invalid eos transaction hash %s %s", hash, err.Error())
}
if len(h) != 32 {
return fmt.Errorf("invalid eos transaction hash %s", hash)
}
return nil
}
func GenerateAssetId(assetKey string) crypto.Hash {
err := VerifyAssetKey(assetKey)
if err != nil {
panic(assetKey)
}
if assetKey == "eosio.token:EOS" {
return EOSChainId
}
h := md5.New()
io.WriteString(h, EOSChainBase)
io.WriteString(h, assetKey)
sum := h.Sum(nil)
sum[6] = (sum[6] & 0x0f) | 0x30
sum[8] = (sum[8] & 0x3f) | 0x80
id := uuid.FromBytesOrNil(sum).String()
return crypto.NewHash([]byte(id))
}