From 47bacfd5c5d22470340e0823c4ad37b45914b68e Mon Sep 17 00:00:00 2001
From: Rasmus Dahlberg <rasmus.dahlberg@kau.se>
Date: Sun, 6 Jun 2021 15:59:35 +0200
Subject: started using the refactored packages in siglog server

---
 sth.go | 143 -----------------------------------------------------------------
 1 file changed, 143 deletions(-)
 delete mode 100644 sth.go

(limited to 'sth.go')

diff --git a/sth.go b/sth.go
deleted file mode 100644
index 1399241..0000000
--- a/sth.go
+++ /dev/null
@@ -1,143 +0,0 @@
-package stfe
-
-import (
-	"context"
-	"crypto/ed25519"
-	"fmt"
-	"reflect"
-	"sync"
-
-	"github.com/golang/glog"
-	"github.com/google/certificate-transparency-go/schedule"
-	"github.com/google/trillian"
-	ttypes "github.com/google/trillian/types"
-	"github.com/system-transparency/stfe/types"
-)
-
-// SthSource provides access to the log's (co)signed tree heads
-type SthSource interface {
-	Latest(context.Context) (*types.SignedTreeHead, error)
-	Stable(context.Context) (*types.SignedTreeHead, error)
-	Cosigned(context.Context) (*types.SignedTreeHead, error)
-	AddCosignature(context.Context, ed25519.PublicKey, *[types.SignatureSize]byte) error
-	Run(context.Context)
-}
-
-// ActiveSthSource implements the SthSource interface for an STFE instance that
-// accepts new logging requests, i.e., the log is running in read+write mode.
-type ActiveSthSource struct {
-	client        trillian.TrillianLogClient
-	logParameters *LogParameters
-	sync.RWMutex
-
-	// cosigned is the current cosigned tree head that is served
-	cosigned types.SignedTreeHead
-
-	// tosign is the current tree head that is being cosigned
-	tosign types.SignedTreeHead
-
-	// cosignature keeps track of all collected cosignatures for tosign
-	cosignature map[[types.HashSize]byte]*types.SigIdent
-}
-
-func NewActiveSthSource(cli trillian.TrillianLogClient, lp *LogParameters) (*ActiveSthSource, error) {
-	s := ActiveSthSource{
-		client:        cli,
-		logParameters: lp,
-	}
-
-	ctx, _ := context.WithTimeout(context.Background(), lp.Deadline)
-	sth, err := s.Latest(ctx)
-	if err != nil {
-		return nil, fmt.Errorf("Latest: %v", err)
-	}
-
-	s.cosigned = *sth
-	s.tosign = *sth
-	s.cosignature = make(map[[types.HashSize]byte]*types.SigIdent)
-	return &s, nil
-}
-
-func (s *ActiveSthSource) Run(ctx context.Context) {
-	schedule.Every(ctx, s.logParameters.Interval, func(ctx context.Context) {
-		// get the next stable sth
-		ictx, _ := context.WithTimeout(ctx, s.logParameters.Deadline)
-		sth, err := s.Latest(ictx)
-		if err != nil {
-			glog.Warningf("cannot rotate without new sth: Latest: %v", err)
-			return
-		}
-		// rotate
-		s.Lock()
-		defer s.Unlock()
-		s.rotate(sth)
-	})
-}
-
-func (s *ActiveSthSource) Latest(ctx context.Context) (*types.SignedTreeHead, error) {
-	trsp, err := s.client.GetLatestSignedLogRoot(ctx, &trillian.GetLatestSignedLogRootRequest{
-		LogId: s.logParameters.TreeId,
-	})
-	var lr ttypes.LogRootV1
-	if errInner := checkGetLatestSignedLogRoot(s.logParameters, trsp, err, &lr); errInner != nil {
-		return nil, fmt.Errorf("invalid signed log root response: %v", errInner)
-	}
-	return s.logParameters.Sign(NewTreeHeadFromLogRoot(&lr))
-}
-
-func (s *ActiveSthSource) Stable(_ context.Context) (*types.SignedTreeHead, error) {
-	s.RLock()
-	defer s.RUnlock()
-	return &s.tosign, nil
-}
-
-func (s *ActiveSthSource) Cosigned(_ context.Context) (*types.SignedTreeHead, error) {
-	s.RLock()
-	defer s.RUnlock()
-	return &s.cosigned, nil
-}
-
-func (s *ActiveSthSource) AddCosignature(_ context.Context, vk ed25519.PublicKey, sig *[types.SignatureSize]byte) error {
-	s.Lock()
-	defer s.Unlock()
-
-	if msg := s.tosign.TreeHead.Marshal(); !ed25519.Verify(vk, msg, sig[:]) {
-		return fmt.Errorf("Invalid signature for tree head with timestamp: %d", s.tosign.TreeHead.Timestamp)
-	}
-	witness := types.Hash(vk[:])
-	if _, ok := s.cosignature[*witness]; ok {
-		glog.V(3).Infof("received cosignature again (duplicate)")
-		return nil // duplicate
-	}
-	s.cosignature[*witness] = &types.SigIdent{
-		Signature: sig,
-		KeyHash:   witness,
-	}
-	glog.V(3).Infof("accepted new cosignature")
-	return nil
-}
-
-// rotate rotates the log's cosigned and stable STH.  The caller must aquire the
-// source's read-write lock if there are concurrent reads and/or writes.
-func (s *ActiveSthSource) rotate(next *types.SignedTreeHead) {
-	if reflect.DeepEqual(s.cosigned.TreeHead, s.tosign.TreeHead) {
-		for _, sigident := range s.cosigned.SigIdent[1:] { // skip log sigident
-			if _, ok := s.cosignature[*sigident.KeyHash]; !ok {
-				s.cosignature[*sigident.KeyHash] = sigident
-			}
-		}
-	}
-	var cosignatures []*types.SigIdent
-	for _, sigident := range s.cosignature {
-		cosignatures = append(cosignatures, sigident)
-	} // cosignatures contains all cosignatures, even if repeated tree head
-
-	// Update cosigned tree head
-	s.cosigned.TreeHead = s.tosign.TreeHead
-	s.cosigned.SigIdent = append(s.tosign.SigIdent, cosignatures...)
-
-	// Update to-sign tree head
-	s.tosign = *next
-	s.cosignature = make(map[[types.HashSize]byte]*types.SigIdent)
-	glog.V(3).Infof("rotated sth")
-}
-- 
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