package types import ( "fmt" "time" "github.com/tendermint/tendermint/crypto/tmhash" tmtime "github.com/tendermint/tendermint/types/time" ) // ValidateTime does a basic time validation ensuring time does not drift too // much: +/- one year. // TODO: reduce this to eg 1 day // NOTE: DO NOT USE in ValidateBasic methods in this package. This function // can only be used for real time validation, like on proposals and votes // in the consensus. If consensus is stuck, and rounds increase for more than a day, // having only a 1-day band here could break things... // Can't use for validating blocks because we may be syncing years worth of history. func ValidateTime(t time.Time) error { var ( now = tmtime.Now() oneYear = 8766 * time.Hour ) if t.Before(now.Add(-oneYear)) || t.After(now.Add(oneYear)) { return fmt.Errorf("time drifted too much. Expected: -1 < %v < 1 year", now) } return nil } // ValidateHash returns an error if the hash is not empty, but its // size != tmhash.Size. func ValidateHash(h []byte) error { if len(h) > 0 && len(h) != tmhash.Size { return fmt.Errorf("expected size to be %d bytes, got %d bytes", tmhash.Size, len(h), ) } return nil }