package types import ( "fmt" "math/big" "regexp" "strings" sdkerrors "github.com/cosmos/cosmos-sdk/types/errors" ) var ( regexChainID = `[a-z]*` regexSeparator = `-{1}` regexEpoch = `[1-9][0-9]*` ethermintChainID = regexp.MustCompile(fmt.Sprintf(`^(%s)%s(%s)$`, regexChainID, regexSeparator, regexEpoch)) ) // IsValidChainID returns false if the given chain identifier is incorrectly formatted. func IsValidChainID(chainID string) bool { if len(chainID) > 48 { return false } return ethermintChainID.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, sdkerrors.Wrapf(ErrInvalidChainID, "chain-id '%s' cannot exceed 48 chars", chainID) } matches := ethermintChainID.FindStringSubmatch(chainID) if matches == nil || len(matches) != 3 || matches[1] == "" { return nil, sdkerrors.Wrap(ErrInvalidChainID, chainID) } // verify that the chain-id entered is a base 10 integer chainIDInt, ok := new(big.Int).SetString(matches[2], 10) if !ok { return nil, sdkerrors.Wrapf(ErrInvalidChainID, "epoch %s must be base-10 integer format", matches[2]) } return chainIDInt, nil }