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