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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package apply
import (
"errors"
"fmt"
"github.com/algorand/go-algorand/crypto"
"github.com/algorand/go-algorand/data/basics"
"github.com/algorand/go-algorand/data/transactions"
)
var errKeyregGoingOnlineExpiredParticipationKey = errors.New("transaction tries to mark an account as online with last voting round in the past")
var errKeyregGoingOnlineFirstVotingInFuture = errors.New("transaction tries to mark an account as online with first voting round beyond the next voting round")
// Keyreg applies a KeyRegistration transaction using the Balances interface.
func Keyreg(keyreg transactions.KeyregTxnFields, header transactions.Header, balances Balances, spec transactions.SpecialAddresses, ad *transactions.ApplyData, round basics.Round) error {
if header.Sender == spec.FeeSink {
return fmt.Errorf("cannot register participation key for fee sink's address %v ", header.Sender)
}
// Get the user's balance entry
record, err := balances.Get(header.Sender, false)
if err != nil {
return err
}
// non-participatory accounts cannot be brought online (or offline)
if record.Status == basics.NotParticipating {
return fmt.Errorf("cannot change online/offline status of non-participating account %v", header.Sender)
}
params := balances.ConsensusParams()
// Update the registered keys and mark account as online
// (or, if the voting or selection keys are zero, offline/not-participating)
record.VoteID = keyreg.VotePK
record.SelectionID = keyreg.SelectionPK
if params.EnableStateProofKeyregCheck {
record.StateProofID = keyreg.StateProofPK
}
if (keyreg.VotePK == crypto.OneTimeSignatureVerifier{} || keyreg.SelectionPK == crypto.VRFVerifier{}) {
if keyreg.Nonparticipation {
if params.SupportBecomeNonParticipatingTransactions {
record.Status = basics.NotParticipating
} else {
return fmt.Errorf("transaction tries to mark an account as nonparticipating, but that transaction is not supported")
}
} else {
record.Status = basics.Offline
}
record.VoteFirstValid = 0
record.VoteLastValid = 0
record.VoteKeyDilution = 0
} else {
if params.EnableKeyregCoherencyCheck {
if keyreg.VoteLast <= round {
return errKeyregGoingOnlineExpiredParticipationKey
}
if keyreg.VoteFirst > round+1 {
return errKeyregGoingOnlineFirstVotingInFuture
}
}
record.Status = basics.Online
record.VoteFirstValid = keyreg.VoteFirst
record.VoteLastValid = keyreg.VoteLast
record.VoteKeyDilution = keyreg.VoteKeyDilution
}
// Write the updated entry
err = balances.Put(header.Sender, record)
if err != nil {
return err
}
return nil
}
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