[c][t] Add TTP calls from client

dfssc/cmd/sign.go

@@ -78,13 +78,6 @@ var signCmd = &cobra.Command{
 			os.Exit(1)
 		}
 
-		// Persist evidencies, if any
-		err = manager.PersistSignaturesToFile()
-		if err != nil {
-			fmt.Fprintln(os.Stderr, err)
-			os.Exit(1)
-		}
-
 		fmt.Println("Signature complete! See .proof file for evidences.")
 	},
 }

dfssc/common/sequence_analysis.go

@@ -4,6 +4,11 @@ import (
 	"errors"
 )
 
+// SequenceCoordinate : contains both the sequence id of a signer, and the index of the occurence in the sequence
+type SequenceCoordinate struct {
+	Signer, Index uint32
+}
+
 // FindNextIndex analyses the specified sequence and tries to find the next occurence of id after the specified index (excluded)
 // Therefore to find the first occurence of the id in the sequence, use -1 as the index
 //
@@ -30,8 +35,8 @@ func FindNextIndex(s []uint32, id uint32, index int) (int, error) {
 //
 // If the index is not the one of the specified id in the sequence, the result still holds, but may be incomplete for your needs
 // If the id is not valid for the specified sequence, the result will be the set of ids of the sequence
-func GetPendingSet(s []uint32, id uint32, index int) ([]uint32, error) {
-	res := []uint32{}
+func GetPendingSet(s []uint32, id uint32, index int) ([]SequenceCoordinate, error) {
+	res := []SequenceCoordinate{}
 
 	if index >= len(s) || index < 0 {
 		return res, errors.New("Index out of range")
@@ -44,8 +49,8 @@ func GetPendingSet(s []uint32, id uint32, index int) ([]uint32, error) {
 
 	for curIndex > -1 && s[curIndex] != id {
 		curID := s[curIndex]
-		if !contains(res, curID) {
-			res = append(res, curID)
+		if !containsCoordinate(res, curID) {
+			res = append(res, SequenceCoordinate{Signer: curID, Index: uint32(curIndex)})
 		}
 		curIndex--
 	}
@@ -59,8 +64,8 @@ func GetPendingSet(s []uint32, id uint32, index int) ([]uint32, error) {
 //
 // If the index is not the one of the specified id in the sequence, the result still holds, but may be incomplete for your needs
 // If the id is not valid for the specified sequence, the result will be the set of ids of the sequence
-func GetSendSet(s []uint32, id uint32, index int) ([]uint32, error) {
-	res := []uint32{}
+func GetSendSet(s []uint32, id uint32, index int) ([]SequenceCoordinate, error) {
+	res := []SequenceCoordinate{}
 
 	if index >= len(s) || index < 0 {
 		return res, errors.New("Index out of range")
@@ -73,8 +78,8 @@ func GetSendSet(s []uint32, id uint32, index int) ([]uint32, error) {
 
 	for curIndex < len(s) && s[curIndex] != id {
 		curID := s[curIndex]
-		if !contains(res, curID) {
-			res = append(res, curID)
+		if !containsCoordinate(res, curID) {
+			res = append(res, SequenceCoordinate{Signer: curID, Index: uint32(curIndex)})
 		}
 		curIndex++
 	}
@@ -82,7 +87,17 @@ func GetSendSet(s []uint32, id uint32, index int) ([]uint32, error) {
 	return res, nil
 }
 
-// contains determines if s contains e
+// containsCoordinate: determines if s contains the specified signer sequence id e
+func containsCoordinate(s []SequenceCoordinate, e uint32) bool {
+	for _, a := range s {
+		if a.Signer == e {
+			return true
+		}
+	}
+	return false
+}
+
+// contains : determines if s contains e
 func contains(s []uint32, e uint32) bool {
 	for _, a := range s {
 		if a == e {
@@ -108,7 +123,17 @@ func GetAllButOne(s []uint32, e uint32) []uint32 {
 	return res
 }
 
-// Remove an ID from the sequence
+// RemoveCoordinate : removes the first occurence of an ID from the coordinates array
+func RemoveCoordinate(s []SequenceCoordinate, e uint32) ([]SequenceCoordinate, error) {
+	for i, a := range s {
+		if a.Signer == e {
+			return append(s[:i], s[i+1:]...), nil
+		}
+	}
+	return s, errors.New("ID not in sequence")
+}
+
+// Remove the first occurence of an ID from the ids array
 func Remove(s []uint32, e uint32) ([]uint32, error) {
 	for i, a := range s {
 		if a == e {

dfssc/common/sequence_analysis_test.go

@@ -50,19 +50,24 @@ func TestGetPendingSet(t *testing.T) {
 
 	res, err = GetPendingSet(s, id, 1)
 	assert.Equal(t, len(res), 1)
-	assert.Equal(t, res[0], uint32(0))
+	assert.Equal(t, res[0].Signer, uint32(0))
+	assert.Equal(t, res[0].Index, uint32(0))
 	assert.Equal(t, err, nil)
 
 	res, err = GetPendingSet(s, id, 2)
 	assert.Equal(t, len(res), 2)
-	assert.Equal(t, res[0], uint32(1))
-	assert.Equal(t, res[1], uint32(0))
+	assert.Equal(t, res[0].Signer, uint32(1))
+	assert.Equal(t, res[0].Index, uint32(1))
+	assert.Equal(t, res[1].Signer, uint32(0))
+	assert.Equal(t, res[1].Index, uint32(0))
 	assert.Equal(t, err, nil)
 
 	res, err = GetPendingSet(s, id, 5)
 	assert.Equal(t, len(res), 2)
-	assert.Equal(t, res[0], uint32(1))
-	assert.Equal(t, res[1], uint32(0))
+	assert.Equal(t, res[0].Signer, uint32(1))
+	assert.Equal(t, res[0].Index, uint32(4))
+	assert.Equal(t, res[1].Signer, uint32(0))
+	assert.Equal(t, res[1].Index, uint32(3))
 	assert.Equal(t, err, nil)
 
 	res, err = GetPendingSet(s, id, -1)
@@ -76,11 +81,23 @@ func TestGetPendingSet(t *testing.T) {
 	s = []uint32{0, 1, 0, 2}
 	res, err = GetPendingSet(s, id, 3)
 	assert.Equal(t, len(res), 2)
-	assert.Equal(t, res[0], uint32(0))
-	assert.Equal(t, res[1], uint32(1))
+	assert.Equal(t, res[0].Signer, uint32(0))
+	assert.Equal(t, res[0].Index, uint32(2))
+	assert.Equal(t, res[1].Signer, uint32(1))
+	assert.Equal(t, res[1].Index, uint32(1))
 	assert.Equal(t, err, nil)
 }
 
+func TestContainsCoordinate(t *testing.T) {
+	var s []SequenceCoordinate
+	s = append(s, SequenceCoordinate{Signer: 0, Index: 0})
+	s = append(s, SequenceCoordinate{Signer: 1, Index: 1})
+
+	assert.Equal(t, containsCoordinate(s, 0), true)
+	assert.Equal(t, containsCoordinate(s, 1), true)
+	assert.Equal(t, containsCoordinate(s, 2), false)
+}
+
 func TestContains(t *testing.T) {
 	s := []uint32{0, 1}
 
@@ -95,19 +112,24 @@ func TestGetSendSet(t *testing.T) {
 
 	res, err := GetSendSet(s, id, 3)
 	assert.Equal(t, len(res), 2)
-	assert.Equal(t, res[0], uint32(1))
-	assert.Equal(t, res[1], uint32(2))
+	assert.Equal(t, res[0].Signer, uint32(1))
+	assert.Equal(t, res[0].Index, uint32(4))
+	assert.Equal(t, res[1].Signer, uint32(2))
+	assert.Equal(t, res[1].Index, uint32(5))
 	assert.Equal(t, err, nil)
 
 	res, err = GetSendSet(s, id, 0)
 	assert.Equal(t, len(res), 2)
-	assert.Equal(t, res[0], uint32(1))
-	assert.Equal(t, res[1], uint32(2))
+	assert.Equal(t, res[0].Signer, uint32(1))
+	assert.Equal(t, res[0].Index, uint32(1))
+	assert.Equal(t, res[1].Signer, uint32(2))
+	assert.Equal(t, res[1].Index, uint32(2))
 	assert.Equal(t, err, nil)
 
 	res, err = GetSendSet(s, 1, 4)
 	assert.Equal(t, len(res), 1)
-	assert.Equal(t, res[0], uint32(2))
+	assert.Equal(t, res[0].Signer, uint32(2))
+	assert.Equal(t, res[0].Index, uint32(5))
 	assert.Equal(t, err, nil)
 
 	res, err = GetSendSet(s, 2, 5)
@@ -139,6 +161,46 @@ func TestGetAllButOne(t *testing.T) {
 	assert.Equal(t, res[2], uint32(2))
 }
 
+func TestRemoveCoordinate(t *testing.T) {
+	var s []SequenceCoordinate
+	s = append(s, SequenceCoordinate{Signer: 0, Index: 0})
+	s = append(s, SequenceCoordinate{Signer: 1, Index: 1})
+
+	assert.Equal(t, len(s), 2)
+	assert.Equal(t, containsCoordinate(s, 0), true)
+	assert.Equal(t, containsCoordinate(s, 1), true)
+
+	s2, err := RemoveCoordinate(s, 3)
+	assert.Equal(t, err.Error(), "ID not in sequence")
+	assert.Equal(t, len(s2), 2)
+	assert.Equal(t, containsCoordinate(s2, 0), true)
+	assert.Equal(t, containsCoordinate(s2, 1), true)
+
+	s3, err := RemoveCoordinate(s, 0)
+	assert.Equal(t, err, nil)
+	assert.Equal(t, len(s3), 1)
+	assert.Equal(t, containsCoordinate(s3, 0), false)
+	assert.Equal(t, containsCoordinate(s3, 1), true)
+}
+
+func TestRemove(t *testing.T) {
+	s := []uint32{0, 1}
+
+	assert.Equal(t, len(s), 2)
+
+	s2, err := Remove(s, 3)
+	assert.Equal(t, err.Error(), "ID not in sequence")
+	assert.Equal(t, len(s2), 2)
+	assert.Equal(t, contains(s2, 0), true)
+	assert.Equal(t, contains(s2, 1), true)
+
+	s3, err := Remove(s, 0)
+	assert.Equal(t, err, nil)
+	assert.Equal(t, len(s3), 1)
+	assert.Equal(t, contains(s3, 0), false)
+	assert.Equal(t, contains(s3, 1), true)
+}
+
 func ExampleFindNextIndex() {
 	s := []uint32{0, 1, 2, 0, 1, 2}
 	id := uint32(2)
@@ -153,6 +215,6 @@ func ExampleFindNextIndex() {
 	fmt.Println("Send Set:", sSet)
 	// Output:
 	// First index: 2
-	// Pending Set: [1 0]
-	// Send Set: [0 1]
+	// Pending Set: [{1 1} {0 0}]
+	// Send Set: [{0 3} {1 4}]
 }

dfssc/sign/promises.go

 package sign
 
 import (
+	"encoding/hex"
 	"errors"
 	"time"
 
@@ -14,20 +15,23 @@ func (m *SignatureManager) createContext(from, to uint32) (*cAPI.Context, error)
 	if int(from) >= len(m.keyHash) || int(to) >= len(m.keyHash) {
 		return nil, errors.New("Invalid id for context creation")
 	}
+
+	h, _ := hex.DecodeString(m.contract.File.Hash)
+
 	return &cAPI.Context{
 		RecipientKeyHash:     m.keyHash[to],
 		SenderKeyHash:        m.keyHash[from],
 		Sequence:             m.sequence,
 		Signers:              m.keyHash,
-		ContractDocumentHash: []byte(m.contract.File.Hash),
+		ContractDocumentHash: h,
 		SignatureUUID:        m.uuid,
 		Seal:                 m.seal,
 	}, nil
 }
 
 // CreatePromise creates a promise from 'from' to 'to', in the context of the SignatureManager
-// provided the specified sequence indexes are valid
-func (m *SignatureManager) CreatePromise(from, to uint32) (*cAPI.Promise, error) {
+// provided that the specified sequence indexes are valid
+func (m *SignatureManager) CreatePromise(from, to, at uint32) (*cAPI.Promise, error) {
 	context, err := m.createContext(from, to)
 	if err != nil {
 		return nil, err
@@ -38,7 +42,7 @@ func (m *SignatureManager) CreatePromise(from, to uint32) (*cAPI.Promise, error)
 	}
 
 	return &cAPI.Promise{
-		Index:   uint32(m.currentIndex),
+		Index:   at,
 		Context: context,
 		Payload: []byte{0x41},
 	}, nil
@@ -69,7 +73,6 @@ func (m *SignatureManager) SendEvidence(promise *cAPI.Promise, signature *cAPI.S
 		m.archives.mutex.Lock()
 		if promise != nil {
 			dAPI.DLog("sent promise to " + mail)
-			m.archives.sentPromises = append(m.archives.sentPromises, promise)
 		} else {
 			dAPI.DLog("sent signature to " + mail)
 			m.archives.sentSignatures = append(m.archives.sentSignatures, signature)

dfssc/sign/protocol.go

@@ -2,12 +2,19 @@
 package sign
 
 import (
+	"bytes"
+	"errors"
 	"fmt"
+	"io/ioutil"
 	"time"
 
 	cAPI "dfss/dfssc/api"
 	"dfss/dfssc/common"
 	dAPI "dfss/dfssd/api"
+	tAPI "dfss/dfsst/api"
+	"dfss/net"
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
 )
 
 // Sign performs all the message exchanges for the contract to be signed
@@ -24,7 +31,7 @@ func (m *SignatureManager) Sign() error {
 		m.closeConnections()
 	}()
 
-	myID, nextIndex, err := m.Initialize()
+	nextIndex, err := m.Initialize()
 	if err != nil {
 		return err
 	}
@@ -45,24 +52,27 @@ func (m *SignatureManager) Sign() error {
 		dAPI.DLog("starting round at index [" + fmt.Sprintf("%d", m.currentIndex) + "] with nextIndex=" + fmt.Sprintf("%d", nextIndex))
 
 		// Set of promises we are waiting for
-		var pendingSet []uint32
-		pendingSet, err = common.GetPendingSet(m.sequence, myID, m.currentIndex)
+		var pendingSet []common.SequenceCoordinate
+		pendingSet, err = common.GetPendingSet(m.sequence, m.myID, m.currentIndex)
 		if err != nil {
 			return err
 		}
 
 		// Set of the promises we must send
-		var sendSet []uint32
-		sendSet, err = common.GetSendSet(m.sequence, myID, m.currentIndex)
+		var sendSet []common.SequenceCoordinate
+		sendSet, err = common.GetSendSet(m.sequence, m.myID, m.currentIndex)
 		if err != nil {
 			return err
 		}
 
 		// Exchange messages
-		m.promiseRound(pendingSet, sendSet, myID)
+		err = m.promiseRound(pendingSet, sendSet)
+		if err != nil {
+			return err
+		}
 
 		m.currentIndex = nextIndex
-		nextIndex, err = common.FindNextIndex(m.sequence, myID, m.currentIndex)
+		nextIndex, err = common.FindNextIndex(m.sequence, m.myID, m.currentIndex)
 		if err != nil {
 			return err
 		}
@@ -78,7 +88,7 @@ func (m *SignatureManager) Sign() error {
 	dAPI.DLog("exiting signature round")
 	m.OnProgressUpdate(seqLen+1, seqLen+1)
 
-	return nil
+	return m.PersistSignaturesToFile()
 }
 
 // GetClient retrieves the Client to the specified sequence id provided it exists
@@ -98,45 +108,52 @@ func (m *SignatureManager) makeSignersHashToIDMap() {
 }
 
 // promiseRound describes a promise round: reception and sending
-func (m *SignatureManager) promiseRound(pendingSet, sendSet []uint32, myID uint32) {
-
+func (m *SignatureManager) promiseRound(pendingSet, sendSet []common.SequenceCoordinate) error {
 	// Reception of the due promises
+	var promises []*cAPI.Promise
 	for len(pendingSet) > 0 {
 		select {
 		case promiseIface := <-m.cServerIface.incomingPromises:
 			promise := (promiseIface).(*cAPI.Promise)
-			senderID, exist := m.hashToID[fmt.Sprintf("%x", promise.Context.SenderKeyHash)]
-			if exist {
+			valid, senderID := m.checkPromise(pendingSet, promise)
+			if valid {
 				var err error
-				pendingSet, err = common.Remove(pendingSet, senderID)
+				pendingSet, err = common.RemoveCoordinate(pendingSet, senderID)
 				if err != nil {
 					continue
 				}
-				m.archives.receivedPromises = append(m.archives.receivedPromises, promise)
+				promises = append(promises, promise)
+			} else {
+				return m.resolve()
 			}
 
 		case <-time.After(time.Minute):
-			// TODO contact TTP
-			return
+			return m.resolve()
 		}
 	}
 
+	// Now that we received everything, we update the evidence we will give to the ttp
+	m.updateReceivedPromises(promises)
+	m.lastValidIndex = m.currentIndex
+
 	c := make(chan *cAPI.Promise, chanBufferSize)
 	// Sending of due promises
-	for _, id := range sendSet {
-		go func(id uint32, m *SignatureManager) {
-			promise, err := m.CreatePromise(myID, id)
+	for _, coord := range sendSet {
+		go func(coord common.SequenceCoordinate, m *SignatureManager) {
+			promise, err := m.CreatePromise(m.myID, coord.Signer, uint32(m.currentIndex))
 			if err == nil {
-				_ = m.SendEvidence(promise, nil, id)
+				_ = m.SendEvidence(promise, nil, coord.Signer)
 			}
 			c <- promise
-		}(id, m)
+		}(coord, m)
 	}
 
 	// Verifying we sent all the due promises
 	for range sendSet {
 		<-c
 	}
+
+	return nil
 }
 
 // closeConnections tries to close all established connection with other peers and platform.
@@ -149,3 +166,108 @@ func (m *SignatureManager) closeConnections() {
 	}
 	m.cServer.Stop()
 }
+
+// updateReceivedPromises : updates the RecievedPromises field of the SignatureManager with the provided promises:
+// if we don't yet have a promise from this signer, we add it to the array.
+// otherwise we replace the one we have by the provided promise.
+func (m *SignatureManager) updateReceivedPromises(promises []*cAPI.Promise) {
+	for _, p := range promises {
+		present, index := m.containsPromiseFrom(p.Context.SenderKeyHash, p.Index)
+
+		if present {
+			// it's present, so there is no index error
+			_ = m.removeReceivedPromise(index)
+		}
+		m.archives.receivedPromises = append(m.archives.receivedPromises, p)
+	}
+}
+
+// containsPromiseFrom : determines if the SignatureManager has already archived a promise from the specified signer, previous to the specified index.
+func (m *SignatureManager) containsPromiseFrom(signer []byte, index uint32) (bool, int) {
+	for i, p := range m.archives.receivedPromises {
+		if bytes.Equal(p.Context.SenderKeyHash, signer) {
+			return p.Index < index, i
+		}
+	}
+	return false, 0
+}
+
+// removeReceivedPromise : removes the promise at the specified index from the archived received promises.
+// If the index is invalid, return an error.
+// If the promise is not there, does nothing.
+func (m *SignatureManager) removeReceivedPromise(index int) error {
+	promises := m.archives.receivedPromises
+	if index < 0 || index >= len(promises) {
+		return errors.New("Index out of range")
+	}
+
+	m.archives.receivedPromises = append(promises[:index], promises[index+1:]...)
+
+	return nil
+}
+
+// callForResolve : calls the ttp for resolution.
+func (m *SignatureManager) callForResolve() (*tAPI.TTPResponse, error) {
+	selfPromise, err := m.CreatePromise(m.myID, m.myID, uint32(m.lastValidIndex))
+	if err != nil {
+		return nil, err
+	}
+
+	toSend := append(m.archives.receivedPromises, selfPromise)
+
+	request := &tAPI.AlertRequest{Promises: toSend}
+
+	ctx, cancel := context.WithTimeout(context.Background(), net.DefaultTimeout)
+	defer cancel()
+	response, err := m.ttp.Alert(ctx, request)
+	if err != nil {
+		return nil, errors.New(grpc.ErrorDesc(err))
+	}
+
+	return response, nil
+}
+
+// resolve : calls for the resolution, and persists the contract if obtained.
+func (m *SignatureManager) resolve() error {
+	if m.ttp == nil {
+		return errors.New("No connection to TTP, aborting!")
+	}
+
+	response, err := m.callForResolve()
+	if err != nil {
+		return err
+	}
+	if response.Abort {
+		return nil
+	}
+	return ioutil.WriteFile(m.mail+"-"+m.contract.UUID+".proof", response.Contract, 0600)
+}
+
+// checkPromise : verifies that the promise is valid wrt the expected promises.
+// We assume that the promise data is consistent wrt the platform seal.
+func (m *SignatureManager) checkPromise(expected []common.SequenceCoordinate, promise *cAPI.Promise) (bool, uint32) {
+	// the promise is consistent, but not for the expected signature
+	// this should not happen
+	if promise.Context.SignatureUUID != m.uuid {
+		return false, 0
+	}
+
+	// the promise is not for us
+	recipientID, exist := m.hashToID[fmt.Sprintf("%x", promise.Context.RecipientKeyHash)]
+	if !exist || recipientID != m.myID {
+		return false, 0
+	}
+
+	// we didn't expect a promise from this client
+	senderID, exist := m.hashToID[fmt.Sprintf("%x", promise.Context.SenderKeyHash)]
+	if !exist {
+		return false, 0
+	}
+	for _, c := range expected {
+		if c.Signer == senderID && c.Index == promise.Index {
+			return true, senderID
+		}
+	}
+
+	return false, 0
+}

dfssc/sign/protocol_test.go

+package sign
+
+import (
+	"testing"
+
+	cAPI "dfss/dfssc/api"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestContainsPromiseFrom(t *testing.T) {
+	sender := []byte{0, 0, 7}
+
+	var promises []*cAPI.Promise
+	promises = append(promises, &cAPI.Promise{
+		Context: &cAPI.Context{
+			SenderKeyHash: []byte{0, 0, 8},
+		},
+		Index: uint32(1),
+	})
+	promises = append(promises, &cAPI.Promise{
+		Context: &cAPI.Context{
+			SenderKeyHash: sender,
+		},
+		Index: uint32(1),
+	})
+
+	m := SignatureManager{
+		archives: &Archives{
+			receivedPromises: promises,
+		},
+	}
+
+	present, index := m.containsPromiseFrom([]byte{0, 0, 6}, 0)
+	assert.Equal(t, present, false)
+	assert.Equal(t, index, 0)
+
+	present, index = m.containsPromiseFrom([]byte{0, 0, 7}, 0)
+	assert.Equal(t, present, false)
+	assert.Equal(t, index, 1)
+
+	present, index = m.containsPromiseFrom([]byte{0, 0, 7}, 2)
+	assert.Equal(t, present, true)
+	assert.Equal(t, index, 1)
+}
+
+func TestRemoveReceivedPromise(t *testing.T) {
+	sender := []byte{0, 0, 7}
+
+	var promises []*cAPI.Promise
+	promises = append(promises, &cAPI.Promise{
+		Context: &cAPI.Context{
+			SenderKeyHash: []byte{0, 0, 8},
+		},
+		Index: