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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 network
import (
"encoding/base64"
"fmt"
"github.com/algorand/go-deadlock"
"github.com/algorand/go-algorand/crypto"
"github.com/algorand/go-algorand/data/basics"
"github.com/algorand/go-algorand/protocol"
)
type netPrioStub struct {
addr basics.Address
prio uint64
peers map[basics.Address]uint64
mu deadlock.Mutex
}
type netPrioStubResponse struct {
Nonce string
Addr basics.Address
Prio uint64
}
func (nps *netPrioStub) NewPrioChallenge() string {
var rand [32]byte
crypto.RandBytes(rand[:])
return base64.StdEncoding.EncodeToString(rand[:])
}
func (nps *netPrioStub) MakePrioResponse(challenge string) []byte {
r := netPrioStubResponse{
Nonce: challenge,
Addr: nps.addr,
Prio: nps.prio,
}
return protocol.EncodeReflect(r)
}
func (nps *netPrioStub) VerifyPrioResponse(challenge string, response []byte) (addr basics.Address, err error) {
var r netPrioStubResponse
err = protocol.DecodeReflect(response, &r)
if err != nil {
return
}
if r.Nonce != challenge {
err = fmt.Errorf("nonce mismatch")
return
}
nps.mu.Lock()
defer nps.mu.Unlock()
if nps.peers == nil {
nps.peers = make(map[basics.Address]uint64)
}
nps.peers[r.Addr] = r.Prio
addr = r.Addr
return
}
func (nps *netPrioStub) GetPrioWeight(addr basics.Address) uint64 {
nps.mu.Lock()
defer nps.mu.Unlock()
if nps.peers == nil {
return 0
}
return nps.peers[addr]
}
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