From a77524ffe650a95287776b4c2e921b57ddc20c85 Mon Sep 17 00:00:00 2001
From: Alejandro Ranchal-Pedrosa <a.ranchalpedrosa@gmail.com>
Date: Thu, 16 Jan 2025 14:20:49 +0100
Subject: [PATCH] Finish implementation with one signer only

---
 consensus/system_contract/consensus.go       |  8 +++++---
 consensus/system_contract/system_contract.go | 11 ++++-------
 2 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/consensus/system_contract/consensus.go b/consensus/system_contract/consensus.go
index bffb2c17d1b3..bf22467f89f4 100644
--- a/consensus/system_contract/consensus.go
+++ b/consensus/system_contract/consensus.go
@@ -252,10 +252,13 @@ func (s *SystemContract) Seal(chain consensus.ChainHeaderReader, block *types.Bl
 	// Don't hold the signer fields for the entire sealing procedure
 	s.lock.RLock()
 	signer, signFn := s.signer, s.signFn
+	signerAddressL1 := s.signerAddressL1
 	s.lock.RUnlock()
 
 	// Bail out if we're unauthorized to sign a block
-	// todo
+	if signer != signerAddressL1 {
+		return errors.New("local node is not authorized to sign this block")
+	}
 
 	// Sweet, the protocol permits us to sign the block, wait for our time
 	delay := time.Unix(int64(header.Time), 0).Sub(time.Now()) // nolint: gosimple
@@ -300,7 +303,6 @@ func SealHash(header *types.Header) (hash common.Hash) {
 	return hash
 }
 
-
 // ecrecover extracts the Ethereum account address from a signed header.
 func ecrecover(header *types.Header) (common.Address, error) {
 	signature := header.Extra[0:]
@@ -368,4 +370,4 @@ func encodeSigHeader(w io.Writer, header *types.Header) {
 	if err := rlp.Encode(w, enc); err != nil {
 		panic("can't encode: " + err.Error())
 	}
-}
\ No newline at end of file
+}
diff --git a/consensus/system_contract/system_contract.go b/consensus/system_contract/system_contract.go
index c7919fc466af..124ab5cd87f5 100644
--- a/consensus/system_contract/system_contract.go
+++ b/consensus/system_contract/system_contract.go
@@ -2,7 +2,6 @@ package system_contract
 
 import (
 	"context"
-	"math/big"
 	"sync"
 	"time"
 
@@ -13,7 +12,7 @@ import (
 )
 
 const (
-	defaultSyncInterval = 10
+	defaultSyncInterval = 10 * time.Second
 )
 
 // SystemContract
@@ -34,9 +33,8 @@ type SystemContract struct {
 // New creates a SystemContract consensus engine with the initial
 // signers set to the ones provided by the user.
 func New(ctx context.Context, config *params.SystemContractConfig, client sync_service.EthClient) *SystemContract {
-	blockNumber := big.NewInt(-1) // todo: get block number from L1BlocksContract (l1 block hash relay) or other source (depending on exact design)
 	ctx, cancel := context.WithCancel(ctx)
-	address, err := client.StorageAt(ctx, config.SystemContractAddress, config.SystemContractSlot, blockNumber)
+	address, err := client.StorageAt(ctx, config.SystemContractAddress, config.SystemContractSlot, nil)
 	if err != nil {
 		log.Error("failed to get signer address from L1 System Contract", "err", err)
 	}
@@ -77,8 +75,7 @@ func (s *SystemContract) Start() {
 			case <-s.ctx.Done():
 				return
 			case <-syncTicker.C:
-				blockNumber := big.NewInt(-1) // todo: get block number from L1BlocksContract (l1 block hash relay) or other source (depending on exact design)
-				address, err := s.client.StorageAt(s.ctx, s.config.SystemContractAddress, s.config.SystemContractSlot, blockNumber)
+				address, err := s.client.StorageAt(s.ctx, s.config.SystemContractAddress, s.config.SystemContractSlot, nil)
 				if err != nil {
 					log.Error("failed to get signer address from L1 System Contract", "err", err)
 				}
@@ -94,4 +91,4 @@ func (s *SystemContract) Start() {
 func (s *SystemContract) Close() error {
 	s.cancel()
 	return nil
-}
\ No newline at end of file
+}