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chain_id.go
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chain_id.go
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// Copyright 2022 Evmos Foundation
// This file is part of the Evmos Network packages.
//
// Evmos is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Evmos packages are distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Evmos packages. If not, see https://github.com/evmos/evmos/blob/main/LICENSE
package types
import (
"fmt"
"math/big"
"regexp"
"strings"
errorsmod "cosmossdk.io/errors"
)
var (
regexChainID = `[a-z]{1,}`
regexEIP155Separator = `_{1}`
regexEIP155 = `[1-9][0-9]*`
regexEpochSeparator = `-{1}`
regexEpoch = `[1-9][0-9]*`
qomChainID = regexp.MustCompile(fmt.Sprintf(`^(%s)%s(%s)%s(%s)$`,
regexChainID,
regexEIP155Separator,
regexEIP155,
regexEpochSeparator,
regexEpoch))
)
// IsValidChainID returns false if the given chain identifier is incorrectly formatted.
func IsValidChainID(chainID string) bool {
if len(chainID) > 48 {
return false
}
return qomChainID.MatchString(chainID)
}
// ParseChainID parses a string chain identifier's epoch to an Ethereum-compatible
// chain-id in *big.Int format. The function returns an error if the chain-id has an invalid format
func ParseChainID(chainID string) (*big.Int, error) {
chainID = strings.TrimSpace(chainID)
if len(chainID) > 48 {
return nil, errorsmod.Wrapf(ErrInvalidChainID, "chain-id '%s' cannot exceed 48 chars", chainID)
}
matches := qomChainID.FindStringSubmatch(chainID)
if matches == nil || len(matches) != 4 || matches[1] == "" {
return nil, errorsmod.Wrapf(ErrInvalidChainID, "%s: %v", chainID, matches)
}
// verify that the chain-id entered is a base 10 integer
chainIDInt, ok := new(big.Int).SetString(matches[2], 10)
if !ok {
return nil, errorsmod.Wrapf(ErrInvalidChainID, "epoch %s must be base-10 integer format", matches[2])
}
return chainIDInt, nil
}