Change InviteId logic and add UserAdd to change builder

aclchanges/pb/aclchanges.pb.go

@@ -652,6 +652,7 @@ type ACLChangeUserInvite struct {
 	EncryptPublicKey  []byte                   `protobuf:"bytes,2,opt,name=encryptPublicKey,proto3" json:"encryptPublicKey,omitempty"`
 	EncryptedReadKeys [][]byte                 `protobuf:"bytes,3,rep,name=encryptedReadKeys,proto3" json:"encryptedReadKeys,omitempty"`
 	Permissions       ACLChangeUserPermissions `protobuf:"varint,4,opt,name=permissions,proto3,enum=anytype.ACLChangeUserPermissions" json:"permissions,omitempty"`
+	InviteId          string                   `protobuf:"bytes,5,opt,name=InviteId,proto3" json:"InviteId,omitempty"`
 }
 
 func (m *ACLChangeUserInvite) Reset()         { *m = ACLChangeUserInvite{} }
@@ -715,11 +716,18 @@ func (m *ACLChangeUserInvite) GetPermissions() ACLChangeUserPermissions {
 	return ACLChange_Admin
 }
 
+func (m *ACLChangeUserInvite) GetInviteId() string {
+	if m != nil {
+		return m.InviteId
+	}
+	return ""
+}
+
 type ACLChangeUserJoin struct {
 	Identity          string   `protobuf:"bytes,1,opt,name=identity,proto3" json:"identity,omitempty"`
 	EncryptionKey     []byte   `protobuf:"bytes,2,opt,name=encryptionKey,proto3" json:"encryptionKey,omitempty"`
 	AcceptSignature   []byte   `protobuf:"bytes,3,opt,name=acceptSignature,proto3" json:"acceptSignature,omitempty"`
-	UserInviteChangeId string   `protobuf:"bytes,4,opt,name=userInviteChangeId,proto3" json:"userInviteChangeId,omitempty"`
+	UserInviteId      string   `protobuf:"bytes,4,opt,name=userInviteId,proto3" json:"userInviteId,omitempty"`
 	EncryptedReadKeys [][]byte `protobuf:"bytes,5,rep,name=encryptedReadKeys,proto3" json:"encryptedReadKeys,omitempty"`
 }
 
@@ -777,9 +785,9 @@ func (m *ACLChangeUserJoin) GetAcceptSignature() []byte {
 	return nil
 }
 
-func (m *ACLChangeUserJoin) GetUserInviteChangeId() string {
+func (m *ACLChangeUserJoin) GetUserInviteId() string {
 	if m != nil {
-		return m.UserInviteChangeId
+		return m.UserInviteId
 	}
 	return ""
 }
@@ -978,64 +986,64 @@ func init() {
 }
 
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+	0x51, 0x6c, 0xf8, 0xaa, 0xf5, 0xaf, 0x7c, 0x75, 0x7c, 0x0a, 0x07, 0x1b, 0xe7, 0xd8, 0x83, 0xdd,
-	0x0b, 0x96, 0x0f, 0x90, 0x5c, 0x4b, 0xb9, 0x2c, 0x1f, 0x74, 0xb0, 0x0b, 0xb6, 0x4e, 0x51, 0x34,
+	0xd3, 0x64, 0x9e, 0xf2, 0x9e, 0x83, 0x01, 0xf6, 0xbe, 0x2a, 0x52, 0xc9, 0x8a, 0x1e, 0x52, 0x6b,
-	0xe8, 0x4e, 0x8f, 0x7e, 0xbb, 0x0e, 0xd0, 0xb3, 0xeb, 0x00, 0xfd, 0x75, 0x1d, 0xa0, 0x9f, 0x6e,
+	0x15, 0x2e, 0x2b, 0x7a, 0x2d, 0xec, 0x83, 0x6b, 0x5a, 0x94, 0xf4, 0xda, 0xe3, 0xa3, 0x67, 0xd7,
-	0x02, 0xeb, 0xd9, 0x4d, 0x60, 0xfd, 0x79, 0x13, 0x58, 0x5f, 0x75, 0xb2, 0x8b, 0x8b, 0x3d, 0xf5,
+	0x11, 0x7a, 0x7e, 0x1d, 0xa1, 0x3f, 0xaf, 0x23, 0xf4, 0xcb, 0x4d, 0xe4, 0x3c, 0xbf, 0x89, 0x9c,
-	0x6f, 0xf9, 0xf0, 0xef, 0x00, 0x00, 0x00, 0xff, 0xff, 0x54, 0xc0, 0x2c, 0x4a, 0x84, 0x0a, 0x00,
+	0x3f, 0x6e, 0x22, 0xe7, 0x9b, 0x56, 0x7e, 0x71, 0xb1, 0xa7, 0xff, 0x6b, 0x3e, 0xfc, 0x3b, 0x00,
-	0x00,
+	0x00, 0xff, 0xff, 0xd3, 0xdf, 0xf9, 0x1b, 0x94, 0x0a, 0x00, 0x00,
 }
 
 func (m *ACLChange) Marshal() (dAtA []byte, err error) {
@@ -1614,6 +1622,13 @@ func (m *ACLChangeUserInvite) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.InviteId) > 0 {
+		i -= len(m.InviteId)
+		copy(dAtA[i:], m.InviteId)
+		i = encodeVarintAclchanges(dAtA, i, uint64(len(m.InviteId)))
+		i--
+		dAtA[i] = 0x2a
+	}
 	if m.Permissions != 0 {
 		i = encodeVarintAclchanges(dAtA, i, uint64(m.Permissions))
 		i--
@@ -1674,10 +1689,10 @@ func (m *ACLChangeUserJoin) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 			dAtA[i] = 0x2a
 		}
 	}
-	if len(m.UserInviteChangeId) > 0 {
+	if len(m.UserInviteId) > 0 {
-		i -= len(m.UserInviteChangeId)
+		i -= len(m.UserInviteId)
-		copy(dAtA[i:], m.UserInviteChangeId)
+		copy(dAtA[i:], m.UserInviteId)
-		i = encodeVarintAclchanges(dAtA, i, uint64(len(m.UserInviteChangeId)))
+		i = encodeVarintAclchanges(dAtA, i, uint64(len(m.UserInviteId)))
 		i--
 		dAtA[i] = 0x22
 	}
@@ -2128,6 +2143,10 @@ func (m *ACLChangeUserInvite) Size() (n int) {
 	if m.Permissions != 0 {
 		n += 1 + sovAclchanges(uint64(m.Permissions))
 	}
+	l = len(m.InviteId)
+	if l > 0 {
+		n += 1 + l + sovAclchanges(uint64(l))
+	}
 	return n
 }
 
@@ -2149,7 +2168,7 @@ func (m *ACLChangeUserJoin) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovAclchanges(uint64(l))
 	}
-	l = len(m.UserInviteChangeId)
+	l = len(m.UserInviteId)
 	if l > 0 {
 		n += 1 + l + sovAclchanges(uint64(l))
 	}
@@ -3881,6 +3900,38 @@ func (m *ACLChangeUserInvite) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field InviteId", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowAclchanges
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthAclchanges
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthAclchanges
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.InviteId = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipAclchanges(dAtA[iNdEx:])
@@ -4033,7 +4084,7 @@ func (m *ACLChangeUserJoin) Unmarshal(dAtA []byte) error {
 			iNdEx = postIndex
 		case 4:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field UserInviteChangeId", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field UserInviteId", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -4061,7 +4112,7 @@ func (m *ACLChangeUserJoin) Unmarshal(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.UserInviteChangeId = string(dAtA[iNdEx:postIndex])
+			m.UserInviteId = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		case 5:
 			if wireType != 2 {

aclchanges/pb/protos/aclchanges.proto

@@ -69,13 +69,14 @@ message ACLChange {
     bytes encryptPublicKey = 2;
     repeated bytes encryptedReadKeys = 3; // all read keys that we know for the user
     UserPermissions permissions = 4;
+    string InviteId = 5;
   }
 
   message UserJoin {
     string identity = 1;
     bytes encryptionKey = 2;
     bytes acceptSignature = 3; // sign acceptPublicKey
-    string userInviteChangeId = 4;
+    string userInviteId = 4;
     repeated bytes encryptedReadKeys = 5; // the idea is that user should itself reencrypt the keys with the pub key
   }
 

acltree/aclstate.go

@@ -41,8 +41,8 @@ func newACLState(
 	}
 }
 
-func newACLStateFromSnapshot(
+func newACLStateFromSnapshotChange(
-	snapshot *pb.ACLChangeACLSnapshot,
+	snapshotChange *pb.ACLChange,
 	identity string,
 	encryptionKey keys.EncryptionPrivKey,
 	signingPubKeyDecoder keys.SigningPubKeyDecoder) (*ACLState, error) {
@@ -54,14 +54,18 @@ func newACLStateFromSnapshot(
 		userInvites:          make(map[string]*pb.ACLChangeUserInvite),
 		signingPubKeyDecoder: signingPubKeyDecoder,
 	}
-	err := st.recreateFromSnapshot(snapshot)
+	err := st.recreateFromSnapshotChange(snapshotChange)
 	if err != nil {
 		return nil, err
 	}
 	return st, nil
 }
 
-func (st *ACLState) recreateFromSnapshot(snapshot *pb.ACLChangeACLSnapshot) error {
+func (st *ACLState) recreateFromSnapshotChange(snapshotChange *pb.ACLChange) error {
+	snapshot := snapshotChange.GetAclData().GetAclSnapshot()
+	if snapshot == nil {
+		return fmt.Errorf("could not create state from snapshot, because it is nil")
+	}
 	state := snapshot.AclState
 	for _, userState := range state.UserStates {
 		st.userStates[userState.Identity] = userState
@@ -71,7 +75,6 @@ func (st *ACLState) recreateFromSnapshot(snapshot *pb.ACLChangeACLSnapshot) erro
 	if !exists {
 		return ErrNoSuchUser
 	}
-	var lastKeyHash uint64
 	for _, key := range userState.EncryptedReadKeys {
 		key, hash, err := st.decryptReadKeyAndHash(key)
 		if err != nil {
@@ -79,9 +82,8 @@ func (st *ACLState) recreateFromSnapshot(snapshot *pb.ACLChangeACLSnapshot) erro
 		}
 
 		st.userReadKeys[hash] = key
-		lastKeyHash = hash
 	}
-	st.currentReadKeyHash = lastKeyHash
+	st.currentReadKeyHash = snapshotChange.CurrentReadKeyHash
 	if snapshot.GetAclState().GetInvites() != nil {
 		st.userInvites = snapshot.GetAclState().GetInvites()
 	}
@@ -101,21 +103,29 @@ func (st *ACLState) makeSnapshot() *pb.ACLChangeACLSnapshot {
 	}}
 }
 
-func (st *ACLState) applyChange(changeId string, change *pb.ACLChange) error {
+func (st *ACLState) applyChange(change *pb.ACLChange) (err error) {
+	defer func() {
+		if err != nil {
+			return
+		}
+		st.currentReadKeyHash = change.CurrentReadKeyHash
+	}()
 	// we can't check this for the user which is joining, because it will not be in our list
 	if !st.isUserJoin(change) {
 		// we check signature when we add this to the Tree, so no need to do it here
 		if _, exists := st.userStates[change.Identity]; !exists {
-			return ErrNoSuchUser
+			err = ErrNoSuchUser
+			return
 		}
 
 		if !st.hasPermission(change.Identity, pb.ACLChange_Admin) {
-			return fmt.Errorf("user %s must have admin permissions", change.Identity)
+			err = fmt.Errorf("user %s must have admin permissions", change.Identity)
+			return
 		}
 	}
 
 	for _, ch := range change.GetAclData().GetAclContent() {
-		if err := st.applyChangeContent(changeId, ch); err != nil {
+		if err = st.applyChangeContent(ch); err != nil {
 			//log.Infof("error while applying changes: %v; ignore", err)
 			return err
 		}
@@ -125,7 +135,7 @@ func (st *ACLState) applyChange(changeId string, change *pb.ACLChange) error {
 }
 
 // TODO: remove changeId, because it is not needed
-func (st *ACLState) applyChangeContent(changeId string, ch *pb.ACLChangeACLContentValue) error {
+func (st *ACLState) applyChangeContent(ch *pb.ACLChangeACLContentValue) error {
 	switch {
 	case ch.GetUserPermissionChange() != nil:
 		return st.applyUserPermissionChange(ch.GetUserPermissionChange())
@@ -134,7 +144,7 @@ func (st *ACLState) applyChangeContent(changeId string, ch *pb.ACLChangeACLConte
 	case ch.GetUserRemove() != nil:
 		return st.applyUserRemove(ch.GetUserRemove())
 	case ch.GetUserInvite() != nil:
-		return st.applyUserInvite(changeId, ch.GetUserInvite())
+		return st.applyUserInvite(ch.GetUserInvite())
 	case ch.GetUserJoin() != nil:
 		return st.applyUserJoin(ch.GetUserJoin())
 	case ch.GetUserConfirm() != nil:
@@ -153,15 +163,15 @@ func (st *ACLState) applyUserPermissionChange(ch *pb.ACLChangeUserPermissionChan
 	return nil
 }
 
-func (st *ACLState) applyUserInvite(changeId string, ch *pb.ACLChangeUserInvite) error {
+func (st *ACLState) applyUserInvite(ch *pb.ACLChangeUserInvite) error {
-	st.userInvites[changeId] = ch
+	st.userInvites[ch.InviteId] = ch
 	return nil
 }
 
 func (st *ACLState) applyUserJoin(ch *pb.ACLChangeUserJoin) error {
-	invite, exists := st.userInvites[ch.UserInviteChangeId]
+	invite, exists := st.userInvites[ch.UserInviteId]
 	if !exists {
-		return fmt.Errorf("no such invite with id %s", ch.UserInviteChangeId)
+		return fmt.Errorf("no such invite with id %s", ch.UserInviteId)
 	}
 
 	if _, exists = st.userStates[ch.Identity]; exists {
@@ -190,7 +200,6 @@ func (st *ACLState) applyUserJoin(ch *pb.ACLChangeUserJoin) error {
 
 	// if ourselves -> we need to decrypt the read keys
 	if st.identity == ch.Identity {
-		var lastKeyHash uint64
 		for _, key := range ch.EncryptedReadKeys {
 			key, hash, err := st.decryptReadKeyAndHash(key)
 			if err != nil {
@@ -198,9 +207,7 @@ func (st *ACLState) applyUserJoin(ch *pb.ACLChangeUserJoin) error {
 			}
 
 			st.userReadKeys[hash] = key
-			lastKeyHash = hash
 		}
-		st.currentReadKeyHash = lastKeyHash
 	}
 
 	// adding user to the list
@@ -227,6 +234,17 @@ func (st *ACLState) applyUserAdd(ch *pb.ACLChangeUserAdd) error {
 		EncryptedReadKeys: ch.EncryptedReadKeys,
 	}
 
+	if ch.Identity == st.identity {
+		for _, key := range ch.EncryptedReadKeys {
+			key, hash, err := st.decryptReadKeyAndHash(key)
+			if err != nil {
+				return ErrFailedToDecrypt
+			}
+
+			st.userReadKeys[hash] = key
+		}
+	}
+
 	return nil
 }
 

acltree/aclstatebuilder.go

@@ -52,9 +52,8 @@ func (sb *aclStateBuilder) BuildBefore(beforeId string) (*ACLState, bool, error)
 		return nil, false, fmt.Errorf("root should always be a snapshot")
 	}
 
-	snapshot := root.Content.GetAclData().GetAclSnapshot()
+	state, err := newACLStateFromSnapshotChange(
-	state, err := newACLStateFromSnapshot(
+		root.Content,
-		snapshot,
 		sb.identity,
 		sb.key,
 		sb.decoder)
@@ -99,7 +98,7 @@ func (sb *aclStateBuilder) BuildBefore(beforeId string) (*ACLState, bool, error)
 
 			idSeenMap[c.Content.Identity] = append(idSeenMap[c.Content.Identity], c)
 			if c.Content.GetAclData() != nil {
-				err = state.applyChange(c.Id, c.Content)
+				err = state.applyChange(c.Content)
 				if err != nil {
 					return false
 				}

acltree/acltree.go

@@ -30,7 +30,7 @@ type TreeUpdateListener interface {
 
 type ACLTree interface {
 	ACLState() *ACLState
-	AddContent(f func(builder ChangeBuilder)) (*Change, error)
+	AddContent(f func(builder ChangeBuilder) error) (*Change, error)
 	AddChanges(changes ...*Change) (AddResult, error)
 	Heads() []string
 	Root() *Change
@@ -186,23 +186,21 @@ func (a *aclTree) ACLState() *ACLState {
 	return a.aclState
 }
 
-func (a *aclTree) AddContent(build func(builder ChangeBuilder)) (*Change, error) {
+func (a *aclTree) AddContent(build func(builder ChangeBuilder) error) (*Change, error) {
 	// TODO: add snapshot creation logic
 	a.Lock()
 	defer a.Unlock()
 
 	a.changeBuilder.Init(a.aclState, a.fullTree, a.accountData)
-	build(a.changeBuilder)
+	err := build(a.changeBuilder)
-
-	ch, marshalled, err := a.changeBuilder.Build()
-	if err != nil {
-		return nil, err
-	}
-	err = a.aclState.applyChange(ch.Id, ch.Content)
 	if err != nil {
 		return nil, err
 	}
 
+	ch, marshalled, err := a.changeBuilder.BuildAndApply()
+	if err != nil {
+		return nil, err
+	}
 	a.fullTree.AddFast(ch)
 
 	err = a.thread.AddRawChange(&thread.RawChange{

acltree/changebuilder.go

@@ -6,12 +6,14 @@ import (
 	"github.com/anytypeio/go-anytype-infrastructure-experiments/util/cid"
 	"github.com/anytypeio/go-anytype-infrastructure-experiments/util/keys"
 	"github.com/gogo/protobuf/proto"
+	"github.com/textileio/go-threads/crypto/symmetric"
+	"hash/fnv"
 )
 
 type MarshalledChange = []byte
 
 type ACLChangeBuilder interface {
-	UserAdd(identity string, encryptionKey keys.EncryptionPubKey, permissions pb.ACLChangeUserPermissions)
+	UserAdd(identity string, encryptionKey keys.EncryptionPubKey, permissions pb.ACLChangeUserPermissions) error
 	AddId(id string)      // TODO: this is only for testing
 	SetMakeSnapshot(bool) // TODO: who should decide this? probably ACLTree so we can delete it
 }
@@ -30,6 +32,8 @@ type changeBuilder struct {
 	changeContent proto.Marshaler
 	id            string
 	makeSnapshot  bool
+	readKey       *symmetric.Key
+	readKeyHash   uint64
 }
 
 func newChangeBuilder() *changeBuilder {
@@ -42,6 +46,17 @@ func (c *changeBuilder) Init(state *ACLState, tree *Tree, acc *account.AccountDa
 	c.acc = acc
 
 	c.aclData = &pb.ACLChangeACLData{}
+	// setting read key for further encryption etc
+	if state.currentReadKeyHash == 0 {
+		c.readKey, _ = symmetric.NewRandom()
+
+		hasher := fnv.New64()
+		hasher.Write(c.readKey.Bytes())
+		c.readKeyHash = hasher.Sum64()
+	} else {
+		c.readKey = c.aclState.userReadKeys[c.aclState.currentReadKeyHash]
+		c.readKeyHash = c.aclState.currentReadKeyHash
+	}
 }
 
 func (c *changeBuilder) AddId(id string) {
@@ -52,12 +67,44 @@ func (c *changeBuilder) SetMakeSnapshot(b bool) {
 	c.makeSnapshot = b
 }
 
-func (c *changeBuilder) UserAdd(identity string, encryptionKey keys.EncryptionPubKey, permissions pb.ACLChangeUserPermissions) {
+func (c *changeBuilder) UserAdd(identity string, encryptionKey keys.EncryptionPubKey, permissions pb.ACLChangeUserPermissions) error {
-	//TODO implement me
+	var allKeys []*symmetric.Key
-	panic("implement me")
+	if c.aclState.currentReadKeyHash != 0 {
+		for _, key := range c.aclState.userReadKeys {
+			allKeys = append(allKeys, key)
+		}
+	} else {
+		allKeys = append(allKeys, c.readKey)
 	}
 
-func (c *changeBuilder) Build() (*Change, []byte, error) {
+	var encryptedKeys [][]byte
+	for _, k := range allKeys {
+		res, err := encryptionKey.Encrypt(k.Bytes())
+		if err != nil {
+			return err
+		}
+
+		encryptedKeys = append(encryptedKeys, res)
+	}
+	rawKey, err := encryptionKey.Raw()
+	if err != nil {
+		return err
+	}
+	ch := &pb.ACLChangeACLContentValue{
+		Value: &pb.ACLChangeACLContentValueValueOfUserAdd{
+			UserAdd: &pb.ACLChangeUserAdd{
+				Identity:          identity,
+				EncryptionKey:     rawKey,
+				EncryptedReadKeys: encryptedKeys,
+				Permissions:       permissions,
+			},
+		},
+	}
+	c.aclData.AclContent = append(c.aclData.AclContent, ch)
+	return nil
+}
+
+func (c *changeBuilder) BuildAndApply() (*Change, []byte, error) {
 	marshalled, err := c.changeContent.Marshal()
 	if err != nil {
 		return nil, nil, err
@@ -69,10 +116,6 @@ func (c *changeBuilder) Build() (*Change, []byte, error) {
 		return nil, nil, err
 	}
 
-	if c.makeSnapshot {
-		c.aclData.AclSnapshot = c.aclState.makeSnapshot()
-	}
-
 	aclChange := &pb.ACLChange{
 		TreeHeadIds:        c.tree.Heads(),
 		AclHeadIds:         c.tree.ACLHeads(),
@@ -83,6 +126,14 @@ func (c *changeBuilder) Build() (*Change, []byte, error) {
 		Timestamp:          0,
 		Identity:           c.acc.Identity,
 	}
+	err = c.aclState.applyChange(aclChange)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if c.makeSnapshot {
+		c.aclData.AclSnapshot = c.aclState.makeSnapshot()
+	}
 
 	fullMarshalledChange, err := proto.Marshal(aclChange)
 	if err != nil {

acltree/snapshotvalidator.go

@@ -41,7 +41,7 @@ func (s *snapshotValidator) ValidateSnapshot(ch *Change) (bool, error) {
 		return false, fmt.Errorf("didn't find snapshot in ACL Tree")
 	}
 
-	otherSt, err := newACLStateFromSnapshot(ch.Content.GetAclData().GetAclSnapshot(), s.identity, s.key, s.decoder)
+	otherSt, err := newACLStateFromSnapshotChange(ch.Content, s.identity, s.key, s.decoder)
 	if err != nil {
 		return false, err
 	}

acltree/threadutility.go

@@ -8,17 +8,20 @@ import (
 
 func BuildThreadWithACL(
 	acc *account.AccountData,
-	build func(builder ChangeBuilder),
+	build func(builder ChangeBuilder) error,
 	create func(change *thread.RawChange) (thread.Thread, error)) (thread.Thread, error) {
 	bld := newChangeBuilder()
 	bld.Init(
 		newACLState(acc.Identity, acc.EncKey, keys.NewEd25519Decoder()),
 		&Tree{},
 		acc)
-	build(bld)
+	err := build(bld)
+	if err != nil {
+		return nil, err
+	}
 	bld.SetMakeSnapshot(true)
 
-	change, payload, err := bld.Build()
+	change, payload, err := bld.BuildAndApply()
 	if err != nil {
 		return nil, err
 	}

plaintextdocument/document.go

@@ -27,13 +27,14 @@ func (p *plainTextDocument) Text() string {
 }
 
 func (p *plainTextDocument) AddText(text string) error {
-	_, err := p.aclTree.AddContent(func(builder acltree.ChangeBuilder) {
+	_, err := p.aclTree.AddContent(func(builder acltree.ChangeBuilder) error {
 		builder.AddChangeContent(
 			&pb.PlainTextChangeData{
 				Content: []*pb.PlainTextChangeContent{
 					createAppendTextChangeContent(text),
 				},
 			})
+		return nil
 	})
 	return err
 }
@@ -114,9 +115,13 @@ func NewPlainTextDocument(
 	acc *account.AccountData,
 	create func(change *thread.RawChange) (thread.Thread, error),
 	text string) (PlainTextDocument, error) {
-	changeBuilder := func(builder acltree.ChangeBuilder) {
+	changeBuilder := func(builder acltree.ChangeBuilder) error {
-		builder.UserAdd(acc.Identity, acc.EncKey.GetPublic(), aclpb.ACLChange_Admin)
+		err := builder.UserAdd(acc.Identity, acc.EncKey.GetPublic(), aclpb.ACLChange_Admin)
+		if err != nil {
+			return err
+		}
 		builder.AddChangeContent(createInitialChangeContent(text))
+		return nil
 	}
 	t, err := acltree.BuildThreadWithACL(
 		acc,

testutils/threadbuilder/threadbuilder.go

@@ -370,7 +370,7 @@ func (t *ThreadBuilder) parseACLChange(ch *ACLChange) (convCh *pb.ACLChangeACLCo
 					Identity:          t.keychain.GetIdentity(join.Identity),
 					EncryptionKey:     rawKey,
 					AcceptSignature:   signature,
-					UserInviteChangeId: join.InviteId,
+					UserInviteId:      join.InviteId,
 					EncryptedReadKeys: t.encryptReadKeys(join.EncryptedReadKeys, encKey),
 				},
 			},
@@ -389,6 +389,7 @@ func (t *ThreadBuilder) parseACLChange(ch *ACLChange) (convCh *pb.ACLChangeACLCo
 					EncryptPublicKey:  rawEncKey,
 					EncryptedReadKeys: t.encryptReadKeys(invite.EncryptedReadKeys, encKey),
 					Permissions:       t.convertPermission(invite.Permissions),
+					InviteId:          invite.InviteId,
 				},
 			},
 		}

testutils/threadbuilder/ymlentities.go

@@ -45,6 +45,7 @@ type ACLChange struct {
 		EncryptionKey     string   `yaml:"encryptionKey"`
 		EncryptedReadKeys []string `yaml:"encryptedReadKeys"`
 		Permissions       string   `yaml:"permissions"`
+		InviteId          string   `yaml:"inviteId"`
 	} `yaml:"userInvite"`
 
 	UserConfirm *struct {

testutils/yamltests/userjoinexample.yml

@@ -29,6 +29,7 @@ changes:
           encryptionKey: key.Enc.Onetime1
           encryptedReadKeys: [key.Read.1]
           permissions: writer
+          inviteId: A.1.2
       - userAdd:
           identity: C
           permission: reader

testutils/yamltests/userjoinexampleupdate.yml

@@ -29,6 +29,7 @@ changes:
           encryptionKey: key.Enc.Onetime1
           encryptedReadKeys: [key.Read.1]
           permissions: writer
+          inviteId: A.1.2
       - userAdd:
           identity: C
           permission: reader

testutils/yamltests/userremoveexample.yml

@@ -29,6 +29,7 @@ changes:
           encryptionKey: key.Enc.Onetime1
           encryptedReadKeys: [key.Read.1]
           permissions: writer
+          inviteId: A.1.2
     readKey: key.Read.1
   - id: A.1.3
     identity: A