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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
}