Golang Record.GetAuthor方法代码示例

func verify(ps peer.Peerstore, r *dhtpb.Record) error {
	v := make(record.Validator)
	v["pk"] = record.PublicKeyValidator
	p := peer.ID(r.GetAuthor())
	pk := ps.PubKey(p)
	if pk == nil {
		return fmt.Errorf("do not have public key for %s", p)
	}
	if err := record.CheckRecordSig(r, pk); err != nil {
		return err
	}
	if err := v.VerifyRecord(r); err != nil {
		return err
	}
	return nil
}

// verifyRecordLocally attempts to verify a record. if we do not have the public
// key, we fail. we do not search the dht.
func (dht *IpfsDHT) verifyRecordLocally(r *pb.Record) error {

	if len(r.Signature) > 0 {
		// First, validate the signature
		p := peer.ID(r.GetAuthor())
		pk := dht.peerstore.PubKey(p)
		if pk == nil {
			return fmt.Errorf("do not have public key for %s", p)
		}

		if err := record.CheckRecordSig(r, pk); err != nil {
			return err
		}
	}

	return dht.Validator.VerifyRecord(r)
}

// verifyRecordOnline verifies a record, searching the DHT for the public key
// if necessary. The reason there is a distinction in the functions is that
// retrieving arbitrary public keys from the DHT as a result of passively
// receiving records (e.g. through a PUT_VALUE or ADD_PROVIDER) can cause a
// massive amplification attack on the dht. Use with care.
func (dht *IpfsDHT) verifyRecordOnline(ctx context.Context, r *pb.Record) error {

	if len(r.Signature) > 0 {
		// get the public key, search for it if necessary.
		p := peer.ID(r.GetAuthor())
		pk, err := dht.GetPublicKey(ctx, p)
		if err != nil {
			return err
		}

		err = record.CheckRecordSig(r, pk)
		if err != nil {
			return err
		}
	}

	return dht.Validator.VerifyRecord(r)
}

// RecordBlobForSig returns the blob protected by the record signature
func RecordBlobForSig(r *pb.Record) []byte {
	k := []byte(r.GetKey())
	v := []byte(r.GetValue())
	a := []byte(r.GetAuthor())
	return bytes.Join([][]byte{k, v, a}, []byte{})
}

func (dht *IpfsDHT) checkLocalDatastore(k key.Key) (*pb.Record, error) {
	log.Debugf("%s handleGetValue looking into ds", dht.self)
	dskey := k.DsKey()
	iVal, err := dht.datastore.Get(dskey)
	log.Debugf("%s handleGetValue looking into ds GOT %v", dht.self, iVal)

	if err == ds.ErrNotFound {
		return nil, nil
	}

	// if we got an unexpected error, bail.
	if err != nil {
		return nil, err
	}

	// if we have the value, send it back
	log.Debugf("%s handleGetValue success!", dht.self)

	byts, ok := iVal.([]byte)
	if !ok {
		return nil, fmt.Errorf("datastore had non byte-slice value for %v", dskey)
	}

	rec := new(pb.Record)
	err = proto.Unmarshal(byts, rec)
	if err != nil {
		log.Debug("Failed to unmarshal dht record from datastore")
		return nil, err
	}

	// if its our record, dont bother checking the times on it
	if peer.ID(rec.GetAuthor()) == dht.self {
		return rec, nil
	}

	var recordIsBad bool
	recvtime, err := u.ParseRFC3339(rec.GetTimeReceived())
	if err != nil {
		log.Info("either no receive time set on record, or it was invalid: ", err)
		recordIsBad = true
	}

	if time.Now().Sub(recvtime) > MaxRecordAge {
		log.Debug("old record found, tossing.")
		recordIsBad = true
	}

	// NOTE: we do not verify the record here beyond checking these timestamps.
	// we put the burden of checking the records on the requester as checking a record
	// may be computationally expensive

	if recordIsBad {
		err := dht.datastore.Delete(dskey)
		if err != nil {
			log.Error("Failed to delete bad record from datastore: ", err)
		}

		return nil, nil // can treat this as not having the record at all
	}

	return rec, nil
}