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package lite
import (
"bytes"
"github.com/pkg/errors"
cmn "github.com/tendermint/tendermint/libs/common"
lerr "github.com/tendermint/tendermint/lite/errors"
"github.com/tendermint/tendermint/types"
)
var _ Verifier = (*BaseVerifier)(nil)
// BaseVerifier lets us check the validity of SignedHeaders at height or
// later, requiring sufficient votes (> 2/3) from the given valset.
// To verify blocks produced by a blockchain with mutable validator sets,
// use the DynamicVerifier.
// TODO: Handle unbonding time.
type BaseVerifier struct {
chainID string
height int64
valset *types.ValidatorSet
}
// NewBaseVerifier returns a new Verifier initialized with a validator set at
// some height.
func NewBaseVerifier(chainID string, height int64, valset *types.ValidatorSet) *BaseVerifier {
if valset.IsNilOrEmpty() {
panic("NewBaseVerifier requires a valid valset")
}
return &BaseVerifier{
chainID: chainID,
height: height,
valset: valset,
}
}
// Implements Verifier.
func (bv *BaseVerifier) ChainID() string {
return bv.chainID
}
// Implements Verifier.
func (bv *BaseVerifier) Verify(signedHeader types.SignedHeader) error {
// We can't verify commits for a different chain.
if signedHeader.ChainID != bv.chainID {
return cmn.NewError("BaseVerifier chainID is %v, cannot verify chainID %v",
bv.chainID, signedHeader.ChainID)
}
// We can't verify commits older than bv.height.
if signedHeader.Height < bv.height {
return cmn.NewError("BaseVerifier height is %v, cannot verify height %v",
bv.height, signedHeader.Height)
}
// We can't verify with the wrong validator set.
if !bytes.Equal(signedHeader.ValidatorsHash,
bv.valset.Hash()) {
return lerr.ErrUnexpectedValidators(signedHeader.ValidatorsHash, bv.valset.Hash())
}
// Do basic sanity checks.
err := signedHeader.ValidateBasic(bv.chainID)
if err != nil {
return errors.Wrap(err, "in verify")
}
// Check commit signatures.
err = bv.valset.VerifyCommit(
bv.chainID, signedHeader.Commit.BlockID,
signedHeader.Height, signedHeader.Commit)
if err != nil {
return errors.Wrap(err, "in verify")
}
return nil
}