71 lines
2.3 KiB
Go
71 lines
2.3 KiB
Go
// Copyright 2021 Evmos Foundation
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// This file is part of Evmos' Ethermint library.
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//
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// The Ethermint library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The Ethermint library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the Ethermint library. If not, see https://github.com/evmos/ethermint/blob/main/LICENSE
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package types
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import (
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"fmt"
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"math/big"
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"regexp"
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"strings"
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errorsmod "cosmossdk.io/errors"
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)
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var (
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regexChainID = `[a-z]{1,}`
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regexEIP155Separator = `_{1}`
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regexEIP155 = `[1-9][0-9]*`
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regexEpochSeparator = `-{1}`
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regexEpoch = `[1-9][0-9]*`
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ethermintChainID = regexp.MustCompile(fmt.Sprintf(`^(%s)%s(%s)%s(%s)$`,
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regexChainID,
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regexEIP155Separator,
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regexEIP155,
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regexEpochSeparator,
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regexEpoch))
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)
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// IsValidChainID returns false if the given chain identifier is incorrectly formatted.
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func IsValidChainID(chainID string) bool {
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if len(chainID) > 48 {
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return false
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}
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return ethermintChainID.MatchString(chainID)
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}
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// ParseChainID parses a string chain identifier's epoch to an Ethereum-compatible
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// chain-id in *big.Int format. The function returns an error if the chain-id has an invalid format
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func ParseChainID(chainID string) (*big.Int, error) {
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chainID = strings.TrimSpace(chainID)
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if len(chainID) > 48 {
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return nil, errorsmod.Wrapf(ErrInvalidChainID, "chain-id '%s' cannot exceed 48 chars", chainID)
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}
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matches := ethermintChainID.FindStringSubmatch(chainID)
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if matches == nil || len(matches) != 4 || matches[1] == "" {
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return nil, errorsmod.Wrapf(ErrInvalidChainID, "%s: %v", chainID, matches)
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}
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// verify that the chain-id entered is a base 10 integer
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chainIDInt, ok := new(big.Int).SetString(matches[2], 10)
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if !ok {
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return nil, errorsmod.Wrapf(ErrInvalidChainID, "epoch %s must be base-10 integer format", matches[2])
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}
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return chainIDInt, nil
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}
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