51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
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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sdkerrors "github.com/cosmos/cosmos-sdk/types/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)$`, regexChainID, regexEIP155Separator, regexEIP155, regexEpochSeparator, 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, sdkerrors.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, sdkerrors.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, sdkerrors.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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