merge

commonspace/acl/aclclient/acjoiningclient.go

@@ -23,6 +23,7 @@ type AclJoiningClient interface {
 	app.Component
 	AclGetRecords(ctx context.Context, spaceId, aclHead string) ([]*consensusproto.RawRecordWithId, error)
 	RequestJoin(ctx context.Context, spaceId string, payload list.RequestJoinPayload) error
+	SendRecord(ctx context.Context, spaceId string, rec *consensusproto.RawRecord) (res *spacesyncproto.AclAddRecordResponse, err error)
 }
 
 type aclJoiningClient struct {
@@ -113,6 +114,24 @@ func (c *aclJoiningClient) RequestJoin(ctx context.Context, spaceId string, payl
 	})
 }
 
+func (c *aclJoiningClient) SendRecord(ctx context.Context, spaceId string, rec *consensusproto.RawRecord) (res *spacesyncproto.AclAddRecordResponse, err error) {
+	marshalled, err := rec.Marshal()
+	if err != nil {
+		return
+	}
+	err = c.doClient(ctx, spaceId, func(cl spacesyncproto.DRPCSpaceSyncClient) error {
+		res, err = cl.AclAddRecord(ctx, &spacesyncproto.AclAddRecordRequest{
+			SpaceId: spaceId,
+			Payload: marshalled,
+		})
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+	return
+}
+
 func (c *aclJoiningClient) doClient(ctx context.Context, spaceId string, f func(cl spacesyncproto.DRPCSpaceSyncClient) error) error {
 	p, err := c.pool.GetOneOf(ctx, c.nodeConf.NodeIds(spaceId))
 	if err != nil {

commonspace/headsync/diffsyncer.go

@@ -113,6 +113,9 @@ func (d *diffSyncer) Sync(ctx context.Context) error {
 }
 
 func (d *diffSyncer) syncWithPeer(ctx context.Context, p peer.Peer) (err error) {
+	if !d.treeSyncer.ShouldSync(p.Id()) {
+		return
+	}
 	ctx = logger.CtxWithFields(ctx, zap.String("peerId", p.Id()))
 	conn, err := p.AcquireDrpcConn(ctx)
 	if err != nil {

commonspace/headsync/diffsyncer_test.go

@@ -119,6 +119,7 @@ func TestDiffSyncer(t *testing.T) {
 		mPeer := mockPeer{}
 		remDiff := NewRemoteDiff(fx.spaceState.SpaceId, fx.clientMock)
 		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.treeSyncerMock.EXPECT().ShouldSync(gomock.Any()).Return(true)
 		fx.peerManagerMock.EXPECT().
 			GetResponsiblePeers(gomock.Any()).
 			Return([]peer.Peer{mPeer}, nil)
@@ -140,6 +141,7 @@ func TestDiffSyncer(t *testing.T) {
 		defer fx.stop()
 		mPeer := mockPeer{}
 		remDiff := NewRemoteDiff(fx.spaceState.SpaceId, fx.clientMock)
+		fx.treeSyncerMock.EXPECT().ShouldSync(gomock.Any()).Return(true)
 		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
 		fx.peerManagerMock.EXPECT().
 			GetResponsiblePeers(gomock.Any()).
@@ -205,6 +207,7 @@ func TestDiffSyncer(t *testing.T) {
 		fx.initDiffSyncer(t)
 		defer fx.stop()
 		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.treeSyncerMock.EXPECT().ShouldSync(gomock.Any()).Return(true)
 		aclStorageMock := mock_liststorage.NewMockListStorage(fx.ctrl)
 		settingsStorage := mock_treestorage.NewMockTreeStorage(fx.ctrl)
 		settingsId := "settingsId"
@@ -255,6 +258,7 @@ func TestDiffSyncer(t *testing.T) {
 		defer fx.stop()
 		remDiff := NewRemoteDiff(fx.spaceState.SpaceId, fx.clientMock)
 		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
+		fx.treeSyncerMock.EXPECT().ShouldSync(gomock.Any()).Return(true)
 		fx.peerManagerMock.EXPECT().
 			GetResponsiblePeers(gomock.Any()).
 			Return([]peer.Peer{mockPeer{}}, nil)
@@ -273,6 +277,7 @@ func TestDiffSyncer(t *testing.T) {
 		defer fx.stop()
 		mPeer := mockPeer{}
 		remDiff := NewRemoteDiff(fx.spaceState.SpaceId, fx.clientMock)
+		fx.treeSyncerMock.EXPECT().ShouldSync(gomock.Any()).Return(true)
 		fx.aclMock.EXPECT().Id().AnyTimes().Return("aclId")
 		fx.peerManagerMock.EXPECT().
 			GetResponsiblePeers(gomock.Any()).

commonspace/object/acl/list/aclrecordbuilder.go

@@ -1,6 +1,7 @@
 package list
 
 import (
+	"errors"
 	"time"
 
 	"github.com/gogo/protobuf/proto"
@@ -509,6 +510,10 @@ func (a *aclRecordBuilder) BuildRequestRemove() (rawRecord *consensusproto.RawRe
 		err = ErrIsOwner
 		return
 	}
+	_, err = a.state.Record(a.state.pubKey)
+	if !errors.Is(err, ErrNoSuchRecord) {
+		return nil, ErrPendingRequest
+	}
 	removeRec := &aclrecordproto.AclAccountRequestRemove{}
 	content := &aclrecordproto.AclContentValue{Value: &aclrecordproto.AclContentValue_AccountRequestRemove{AccountRequestRemove: removeRec}}
 	return a.buildRecord(content)

commonspace/object/acl/list/aclstate.go

@@ -163,7 +163,7 @@ func (st *AclState) PermissionsAtRecord(id string, pubKey crypto.PubKey) (AclPer
 	return perms, nil
 }
 
-func (st *AclState) CurrentStates() []AccountState {
+func (st *AclState) CurrentAccounts() []AccountState {
 	var res []AccountState
 	for _, state := range st.accountStates {
 		res = append(res, state)
@@ -171,6 +171,19 @@ func (st *AclState) CurrentStates() []AccountState {
 	return res
 }
 
+func (st *AclState) HadReadPermissions(identity crypto.PubKey) (had bool) {
+	state, exists := st.accountStates[mapKeyFromPubKey(identity)]
+	if !exists {
+		return false
+	}
+	for _, perm := range state.PermissionChanges {
+		if !perm.Permission.NoPermissions() {
+			return true
+		}
+	}
+	return false
+}
+
 func (st *AclState) Invites() []crypto.PubKey {
 	var invites []crypto.PubKey
 	for _, inv := range st.inviteKeys {

commonspace/object/acl/list/acltestsuite_test.go

@@ -101,6 +101,7 @@ func TestAclExecutor(t *testing.T) {
 		// g can cancel request to remove
 		{"g.cancel:g", nil},
 		{"g.request_remove:g", nil},
+		{"g.request_remove:g", ErrPendingRequest},
 		{"a.remove:g", nil},
 		// g cannot cancel not existing request to remove
 		{"g.cancel:g", ErrNoSuchRecord},

commonspace/object/acl/list/validator.go

@@ -247,6 +247,9 @@ func (c *contentValidator) ValidateRequestRemove(ch *aclrecordproto.AclAccountRe
 	if c.aclState.Permissions(authorIdentity).NoPermissions() {
 		return ErrInsufficientPermissions
 	}
+	if c.aclState.Permissions(authorIdentity).IsOwner() {
+		return ErrIsOwner
+	}
 	if _, exists := c.aclState.pendingRequests[mapKeyFromPubKey(authorIdentity)]; exists {
 		return ErrPendingRequest
 	}

commonspace/object/tree/objecttree/derivedtree.go

@@ -1,12 +1,17 @@
 package objecttree
 
 import (
-	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/gogo/protobuf/proto"
+
+	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 )
 
 func IsEmptyDerivedTree(tree ObjectTree) bool {
-	return tree.IsDerived() && tree.Len() == 1 && tree.Root().Id == tree.Header().Id
+	return tree.IsDerived() && IsEmptyTree(tree)
+}
+
+func IsEmptyTree(tree ObjectTree) bool {
+	return tree.Len() == 1 && tree.Root().Id == tree.Header().Id
 }
 
 func IsDerivedRoot(root *treechangeproto.RawTreeChangeWithId) (derived bool, err error) {

commonspace/object/tree/objecttree/objecttree.go

@@ -366,6 +366,16 @@ func (ot *objectTree) addRawChanges(ctx context.Context, changesPayload RawChang
 		return
 	}
 
+	var (
+		filteredHeads = false
+		headsToUse    = changesPayload.NewHeads
+	)
+	// if our validator provides filtering mechanism then we use it
+	filteredHeads, ot.newChangesBuf, ot.newSnapshotsBuf, ot.notSeenIdxBuf = ot.validator.FilterChanges(ot.aclList, changesPayload.NewHeads, ot.newChangesBuf, ot.newSnapshotsBuf, ot.notSeenIdxBuf)
+	if filteredHeads {
+		// if we filtered some of the heads, then we don't know which heads to use
+		headsToUse = []string{}
+	}
 	rollback := func(changes []*Change) {
 		for _, ch := range changes {
 			if _, exists := ot.tree.attached[ch.Id]; exists {
@@ -400,7 +410,7 @@ func (ot *objectTree) addRawChanges(ctx context.Context, changesPayload RawChang
 	}
 
 	if shouldRebuildFromStorage {
-		err = ot.rebuildFromStorage(changesPayload.NewHeads, ot.newChangesBuf)
+		err = ot.rebuildFromStorage(headsToUse, ot.newChangesBuf)
 		if err != nil {
 			// rebuilding without new changes
 			ot.rebuildFromStorage(nil, nil)
@@ -662,12 +672,15 @@ func (ot *objectTree) readKeysFromAclState(state *list.AclState) (err error) {
 		return nil
 	}
 	// if we can't read the keys anyway
-	if state.AccountKey() == nil || state.Permissions(state.AccountKey().GetPublic()).NoPermissions() {
+	if state.AccountKey() == nil || !state.HadReadPermissions(state.AccountKey().GetPublic()) {
 		return nil
 	}
 	for key, value := range state.Keys() {
+		if _, exists := ot.keys[key]; exists {
+			continue
+		}
 		if value.ReadKey == nil {
-			return list.ErrNoReadKey
+			continue
 		}
 		treeKey, err := deriveTreeKey(value.ReadKey, ot.id)
 		if err != nil {
@@ -679,6 +692,9 @@ func (ot *objectTree) readKeysFromAclState(state *list.AclState) (err error) {
 	if err != nil {
 		return err
 	}
+	if curKey == nil {
+		return nil
+	}
 	ot.currentReadKey, err = deriveTreeKey(curKey, ot.id)
 	return err
 }

commonspace/object/tree/objecttree/objecttree_test.go

@@ -25,6 +25,25 @@ type testTreeContext struct {
 	objTree       ObjectTree
 }
 
+func genBuildFilterableTestableTree(filterFunc func(ch *Change) bool) func(treeStorage treestorage.TreeStorage, aclList list.AclList) (ObjectTree, error) {
+	return func(treeStorage treestorage.TreeStorage, aclList list.AclList) (ObjectTree, error) {
+		root, _ := treeStorage.Root()
+		changeBuilder := &nonVerifiableChangeBuilder{
+			ChangeBuilder: NewChangeBuilder(newMockKeyStorage(), root),
+		}
+		deps := objectTreeDeps{
+			changeBuilder:   changeBuilder,
+			treeBuilder:     newTreeBuilder(true, treeStorage, changeBuilder),
+			treeStorage:     treeStorage,
+			rawChangeLoader: newRawChangeLoader(treeStorage, changeBuilder),
+			validator:       &noOpTreeValidator{filterFunc: filterFunc},
+			aclList:         aclList,
+		}
+
+		return buildObjectTree(deps)
+	}
+}
+
 func prepareAclList(t *testing.T) (list.AclList, *accountdata.AccountKeys) {
 	randKeys, err := accountdata.NewRandom()
 	require.NoError(t, err)
@@ -129,7 +148,7 @@ func TestObjectTree(t *testing.T) {
 		}, aAccount.Acl)
 		require.NoError(t, err)
 		aStore, _ := treestorage.NewInMemoryTreeStorage(root, []string{root.Id}, []*treechangeproto.RawTreeChangeWithId{root})
-		aTree, err := BuildKeyVerifiableObjectTree(aStore, aAccount.Acl)
+		aTree, err := BuildKeyFilterableObjectTree(aStore, aAccount.Acl)
 		require.NoError(t, err)
 		_, err = aTree.AddContent(ctx, SignableChangeContent{
 			Data:        []byte("some"),
@@ -140,7 +159,7 @@ func TestObjectTree(t *testing.T) {
 		})
 		require.NoError(t, err)
 		bStore := aTree.Storage().(*treestorage.InMemoryTreeStorage).Copy()
-		bTree, err := BuildKeyVerifiableObjectTree(bStore, bAccount.Acl)
+		bTree, err := BuildKeyFilterableObjectTree(bStore, bAccount.Acl)
 		require.NoError(t, err)
 		err = exec.Execute("a.remove:b")
 		require.NoError(t, err)
@@ -157,17 +176,17 @@ func TestObjectTree(t *testing.T) {
 			NewHeads:   aTree.Heads(),
 			RawChanges: res.Added,
 		})
-		require.Equal(t, ErrHasInvalidChanges, err)
 		require.Equal(t, oldHeads, bTree.Heads())
 		bStore = aTree.Storage().(*treestorage.InMemoryTreeStorage).Copy()
 		root, _ = bStore.Root()
 		heads, _ := bStore.Heads()
-		err = ValidateRawTreeBuildFunc(treestorage.TreeStorageCreatePayload{
+		filteredPayload, err := ValidateFilterRawTree(treestorage.TreeStorageCreatePayload{
 			RootRawChange: root,
 			Changes:       bStore.AllChanges(),
 			Heads:         heads,
-		}, BuildKeyVerifiableObjectTree, bAccount.Acl)
+		}, bAccount.Acl)
-		require.Equal(t, ErrHasInvalidChanges, err)
+		require.NoError(t, err)
+		require.Equal(t, 2, len(filteredPayload.Changes))
 		err = aTree.IterateRoot(func(change *Change, decrypted []byte) (any, error) {
 			return nil, nil
 		}, func(change *Change) bool {
@@ -667,6 +686,35 @@ func TestObjectTree(t *testing.T) {
 		})
 	})
 
+	t.Run("test tree filter", func(t *testing.T) {
+		filterFunc := func(change *Change) bool {
+			return slices.Contains([]string{"0", "1", "2", "3", "4", "7", "8"}, change.Id)
+		}
+		ctx := prepareContext(t, aclList, genBuildFilterableTestableTree(filterFunc), false, nil)
+		rawChanges := []*treechangeproto.RawTreeChangeWithId{
+			ctx.changeCreator.CreateRawWithData("1", aclList.Head().Id, "0", false, []byte("1"), "0"),
+			ctx.changeCreator.CreateRawWithData("2", aclList.Head().Id, "0", false, []byte("2"), "1"),
+			ctx.changeCreator.CreateRawWithData("3", aclList.Head().Id, "0", false, []byte("3"), "2"),
+			ctx.changeCreator.CreateRawWithData("4", aclList.Head().Id, "0", false, []byte("4"), "2"),
+			ctx.changeCreator.CreateRawWithData("5", aclList.Head().Id, "0", false, []byte("5"), "1"),
+			ctx.changeCreator.CreateRawWithData("6", aclList.Head().Id, "0", true, []byte("6"), "3", "4", "5"),
+			ctx.changeCreator.CreateRawWithData("7", aclList.Head().Id, "6", false, []byte("7"), "6"),
+			ctx.changeCreator.CreateRawWithData("8", aclList.Head().Id, "6", false, []byte("8"), "6"),
+		}
+		_, err := ctx.objTree.AddRawChanges(context.Background(), RawChangesPayload{
+			NewHeads:   []string{"7", "8"},
+			RawChanges: rawChanges,
+		})
+		require.NoError(t, err)
+		var ids []string
+		ctx.objTree.IterateRoot(nil, func(change *Change) bool {
+			ids = append(ids, change.Id)
+			return true
+		})
+		slices.Sort(ids)
+		require.Equal(t, []string{"0", "1", "2", "3", "4"}, ids)
+	})
+
 	t.Run("rollback when add to storage returns error", func(t *testing.T) {
 		ctx := prepareTreeContext(t, aclList)
 		changeCreator := ctx.changeCreator

commonspace/object/tree/objecttree/objecttreefactory.go

@@ -55,7 +55,7 @@ func verifiableTreeDeps(
 		changeBuilder:   changeBuilder,
 		treeBuilder:     treeBuilder,
 		treeStorage:     treeStorage,
-		validator:       newTreeValidator(false),
+		validator:       newTreeValidator(false, false),
 		rawChangeLoader: newRawChangeLoader(treeStorage, changeBuilder),
 		aclList:         aclList,
 	}
@@ -71,7 +71,7 @@ func emptyDataTreeDeps(
 		changeBuilder:   changeBuilder,
 		treeBuilder:     treeBuilder,
 		treeStorage:     treeStorage,
-		validator:       newTreeValidator(false),
+		validator:       newTreeValidator(false, false),
 		rawChangeLoader: newStorageLoader(treeStorage, changeBuilder),
 		aclList:         aclList,
 	}
@@ -136,13 +136,13 @@ func BuildEmptyDataTestableTree(treeStorage treestorage.TreeStorage, aclList lis
 	return buildObjectTree(deps)
 }
 
-func BuildKeyVerifiableObjectTree(treeStorage treestorage.TreeStorage, aclList list.AclList) (ObjectTree, error) {
+func BuildKeyFilterableObjectTree(treeStorage treestorage.TreeStorage, aclList list.AclList) (ObjectTree, error) {
 	rootChange, err := treeStorage.Root()
 	if err != nil {
 		return nil, err
 	}
 	deps := defaultObjectTreeDeps(rootChange, treeStorage, aclList)
-	deps.validator = newTreeValidator(true)
+	deps.validator = newTreeValidator(true, true)
 	return buildObjectTree(deps)
 }
 

commonspace/object/tree/objecttree/objecttreevalidator.go

@@ -9,14 +9,19 @@ import (
 	"github.com/anyproto/any-sync/util/slice"
 )
 
+type ValidatorFunc func(payload treestorage.TreeStorageCreatePayload, buildFunc BuildObjectTreeFunc, aclList list.AclList) (retPayload treestorage.TreeStorageCreatePayload, err error)
+
 type ObjectTreeValidator interface {
 	// ValidateFullTree should always be entered while holding a read lock on AclList
 	ValidateFullTree(tree *Tree, aclList list.AclList) error
 	// ValidateNewChanges should always be entered while holding a read lock on AclList
 	ValidateNewChanges(tree *Tree, aclList list.AclList, newChanges []*Change) error
+	FilterChanges(aclList list.AclList, heads []string, changes []*Change, snapshots []*Change, indexes []int) (filteredHeads bool, filtered, filteredSnapshots []*Change, newIndexes []int)
 }
 
-type noOpTreeValidator struct{}
+type noOpTreeValidator struct {
+	filterFunc func(ch *Change) bool
+}
 
 func (n *noOpTreeValidator) ValidateFullTree(tree *Tree, aclList list.AclList) error {
 	return nil
@@ -26,13 +31,34 @@ func (n *noOpTreeValidator) ValidateNewChanges(tree *Tree, aclList list.AclList,
 	return nil
 }
 
-type objectTreeValidator struct {
+func (n *noOpTreeValidator) FilterChanges(aclList list.AclList, heads []string, changes []*Change, snapshots []*Change, indexes []int) (filteredHeads bool, filtered, filteredSnapshots []*Change, newIndexes []int) {
-	validateKeys bool
+	if n.filterFunc == nil {
+		return false, changes, snapshots, indexes
+	}
+	for idx, c := range changes {
+		// only taking changes which we can read
+		if n.filterFunc(c) {
+			newIndexes = append(newIndexes, indexes[idx])
+			filtered = append(filtered, c)
+			if c.IsSnapshot {
+				filteredSnapshots = append(filteredSnapshots, c)
+			}
+		} else {
+			filteredHeads = true
+		}
+	}
+	return
 }
 
-func newTreeValidator(validateKeys bool) ObjectTreeValidator {
+type objectTreeValidator struct {
+	validateKeys bool
+	shouldFilter bool
+}
+
+func newTreeValidator(validateKeys bool, filterChanges bool) ObjectTreeValidator {
 	return &objectTreeValidator{
 		validateKeys: validateKeys,
+		shouldFilter: filterChanges,
 	}
 }
 
@@ -54,6 +80,30 @@ func (v *objectTreeValidator) ValidateNewChanges(tree *Tree, aclList list.AclLis
 	return
 }
 
+func (v *objectTreeValidator) FilterChanges(aclList list.AclList, heads []string, changes []*Change, snapshots []*Change, indexes []int) (filteredHeads bool, filtered, filteredSnapshots []*Change, newIndexes []int) {
+	if !v.shouldFilter {
+		return false, changes, snapshots, indexes
+	}
+	aclList.RLock()
+	defer aclList.RUnlock()
+	state := aclList.AclState()
+	for idx, c := range changes {
+		// only taking changes which we can read
+		if keys, exists := state.Keys()[c.ReadKeyId]; exists && keys.ReadKey != nil {
+			newIndexes = append(newIndexes, indexes[idx])
+			filtered = append(filtered, c)
+			if c.IsSnapshot {
+				filteredSnapshots = append(filteredSnapshots, c)
+			}
+		} else {
+			// if we filtered at least one change this can be the change between heads and other changes
+			// thus we cannot use heads
+			filteredHeads = true
+		}
+	}
+	return
+}
+
 func (v *objectTreeValidator) validateChange(tree *Tree, aclList list.AclList, c *Change) (err error) {
 	var (
 		perms list.AclPermissions
@@ -103,7 +153,7 @@ func (v *objectTreeValidator) validateChange(tree *Tree, aclList list.AclList, c
 	return
 }
 
-func ValidateRawTreeBuildFunc(payload treestorage.TreeStorageCreatePayload, buildFunc BuildObjectTreeFunc, aclList list.AclList) (err error) {
+func ValidateRawTreeBuildFunc(payload treestorage.TreeStorageCreatePayload, buildFunc BuildObjectTreeFunc, aclList list.AclList) (newPayload treestorage.TreeStorageCreatePayload, err error) {
 	treeStorage, err := treestorage.NewInMemoryTreeStorage(payload.RootRawChange, []string{payload.RootRawChange.Id}, nil)
 	if err != nil {
 		return
@@ -120,15 +170,48 @@ func ValidateRawTreeBuildFunc(payload treestorage.TreeStorageCreatePayload, buil
 		return
 	}
 	if !slice.UnsortedEquals(res.Heads, payload.Heads) {
-		return ErrHasInvalidChanges
+		return payload, ErrHasInvalidChanges
 	}
 	// if tree has only one change we still should check if the snapshot id is same as root
 	if IsEmptyDerivedTree(tree) {
-		return ErrDerived
+		return payload, ErrDerived
 	}
-	return
+	return payload, nil
+}
+
+func ValidateFilterRawTree(payload treestorage.TreeStorageCreatePayload, aclList list.AclList) (retPayload treestorage.TreeStorageCreatePayload, err error) {
+	aclList.RLock()
+	if !aclList.AclState().HadReadPermissions(aclList.AclState().Identity()) {
+		aclList.RUnlock()
+		return payload, list.ErrNoReadKey
+	}
+	aclList.RUnlock()
+	treeStorage, err := treestorage.NewInMemoryTreeStorage(payload.RootRawChange, []string{payload.RootRawChange.Id}, nil)
+	if err != nil {
+		return
+	}
+	tree, err := BuildKeyFilterableObjectTree(treeStorage, aclList)
+	if err != nil {
+		return
+	}
+	res, err := tree.AddRawChanges(context.Background(), RawChangesPayload{
+		NewHeads:   payload.Heads,
+		RawChanges: payload.Changes,
+	})
+	if err != nil {
+		return
+	}
+	if IsEmptyTree(tree) {
+		return payload, ErrNoChangeInTree
+	}
+	return treestorage.TreeStorageCreatePayload{
+		RootRawChange: payload.RootRawChange,
+		Heads:         res.Heads,
+		Changes:       treeStorage.(*treestorage.InMemoryTreeStorage).AllChanges(),
+	}, nil
 }
 
 func ValidateRawTree(payload treestorage.TreeStorageCreatePayload, aclList list.AclList) (err error) {
-	return ValidateRawTreeBuildFunc(payload, BuildObjectTree, aclList)
+	_, err = ValidateRawTreeBuildFunc(payload, BuildObjectTree, aclList)
+	return
 }

commonspace/object/tree/synctree/synctree.go

@@ -6,6 +6,8 @@ import (
 	"errors"
 	"time"
 
+	"go.uber.org/zap"
+
 	"github.com/anyproto/any-sync/app/logger"
 	"github.com/anyproto/any-sync/commonspace/object/acl/list"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
@@ -16,7 +18,6 @@ import (
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
 	"github.com/anyproto/any-sync/net/peer"
 	"github.com/anyproto/any-sync/nodeconf"
-	"go.uber.org/zap"
 )
 
 var (
@@ -59,18 +60,19 @@ type ResponsiblePeersGetter interface {
 }
 
 type BuildDeps struct {
-	SpaceId         string
+	SpaceId            string
-	SyncClient      SyncClient
+	SyncClient         SyncClient
-	Configuration   nodeconf.NodeConf
+	Configuration      nodeconf.NodeConf
-	HeadNotifiable  HeadNotifiable
+	HeadNotifiable     HeadNotifiable
-	Listener        updatelistener.UpdateListener
+	Listener           updatelistener.UpdateListener
-	AclList         list.AclList
+	AclList            list.AclList
-	SpaceStorage    spacestorage.SpaceStorage
+	SpaceStorage       spacestorage.SpaceStorage
-	TreeStorage     treestorage.TreeStorage
+	TreeStorage        treestorage.TreeStorage
-	OnClose         func(id string)
+	OnClose            func(id string)
-	SyncStatus      syncstatus.StatusUpdater
+	SyncStatus         syncstatus.StatusUpdater
-	PeerGetter      ResponsiblePeersGetter
+	PeerGetter         ResponsiblePeersGetter
-	BuildObjectTree objecttree.BuildObjectTreeFunc
+	BuildObjectTree    objecttree.BuildObjectTreeFunc
+	ValidateObjectTree objecttree.ValidatorFunc
 }
 
 func BuildSyncTreeOrGetRemote(ctx context.Context, id string, deps BuildDeps) (t SyncTree, err error) {

commonspace/object/tree/synctree/treeremotegetter.go

@@ -104,13 +104,17 @@ func (t treeRemoteGetter) getTree(ctx context.Context) (treeStorage treestorage.
 		Heads:         fullSyncResp.Heads,
 	}
 
+	validatorFunc := t.deps.ValidateObjectTree
+	if validatorFunc == nil {
+		validatorFunc = objecttree.ValidateRawTreeBuildFunc
+	}
 	// basically building tree with in-memory storage and validating that it was without errors
 	log.With(zap.String("id", t.treeId)).DebugCtx(ctx, "validating tree")
-	err = objecttree.ValidateRawTreeBuildFunc(payload, t.deps.BuildObjectTree, t.deps.AclList)
+	newPayload, err := validatorFunc(payload, t.deps.BuildObjectTree, t.deps.AclList)
 	if err != nil {
 		return
 	}
 	// now we are sure that we can save it to the storage
-	treeStorage, err = t.deps.SpaceStorage.CreateTreeStorage(payload)
+	treeStorage, err = t.deps.SpaceStorage.CreateTreeStorage(newPayload)
 	return
 }

commonspace/object/treesyncer/mock_treesyncer/mock_treesyncer.go

@@ -5,7 +5,6 @@
 //
 //	mockgen -destination mock_treesyncer/mock_treesyncer.go github.com/anyproto/any-sync/commonspace/object/treesyncer TreeSyncer
 //
-
 // Package mock_treesyncer is a generated GoMock package.
 package mock_treesyncer
 
@@ -96,6 +95,20 @@ func (mr *MockTreeSyncerMockRecorder) Run(arg0 any) *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Run", reflect.TypeOf((*MockTreeSyncer)(nil).Run), arg0)
 }
 
+// ShouldSync mocks base method.
+func (m *MockTreeSyncer) ShouldSync(arg0 string) bool {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "ShouldSync", arg0)
+	ret0, _ := ret[0].(bool)
+	return ret0
+}
+
+// ShouldSync indicates an expected call of ShouldSync.
+func (mr *MockTreeSyncerMockRecorder) ShouldSync(arg0 any) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ShouldSync", reflect.TypeOf((*MockTreeSyncer)(nil).ShouldSync), arg0)
+}
+
 // StartSync mocks base method.
 func (m *MockTreeSyncer) StartSync() {
 	m.ctrl.T.Helper()
@@ -108,6 +121,18 @@ func (mr *MockTreeSyncerMockRecorder) StartSync() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "StartSync", reflect.TypeOf((*MockTreeSyncer)(nil).StartSync))
 }
 
+// StopSync mocks base method.
+func (m *MockTreeSyncer) StopSync() {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "StopSync")
+}
+
+// StopSync indicates an expected call of StopSync.
+func (mr *MockTreeSyncerMockRecorder) StopSync() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "StopSync", reflect.TypeOf((*MockTreeSyncer)(nil).StopSync))
+}
+
 // SyncAll mocks base method.
 func (m *MockTreeSyncer) SyncAll(arg0 context.Context, arg1 string, arg2, arg3 []string) error {
 	m.ctrl.T.Helper()

commonspace/object/treesyncer/treesyncer.go

@@ -12,5 +12,7 @@ const CName = "common.object.treesyncer"
 type TreeSyncer interface {
 	app.ComponentRunnable
 	StartSync()
+	StopSync()
+	ShouldSync(peerId string) bool
 	SyncAll(ctx context.Context, peerId string, existing, missing []string) error
 }

commonspace/objecttreebuilder/treebuilder.go

@@ -6,6 +6,8 @@ import (
 	"errors"
 	"sync/atomic"
 
+	"go.uber.org/zap"
+
 	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/app/logger"
 	"github.com/anyproto/any-sync/commonspace/headsync"
@@ -23,12 +25,12 @@ import (
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
 	"github.com/anyproto/any-sync/nodeconf"
-	"go.uber.org/zap"
 )
 
 type BuildTreeOpts struct {
-	Listener    updatelistener.UpdateListener
+	Listener      updatelistener.UpdateListener
-	TreeBuilder objecttree.BuildObjectTreeFunc
+	TreeBuilder   objecttree.BuildObjectTreeFunc
+	TreeValidator objecttree.ValidatorFunc
 }
 
 const CName = "common.commonspace.objecttreebuilder"
@@ -111,17 +113,18 @@ func (t *treeBuilder) BuildTree(ctx context.Context, id string, opts BuildTreeOp
 		treeBuilder = t.builder
 	}
 	deps := synctree.BuildDeps{
-		SpaceId:         t.spaceId,
+		SpaceId:            t.spaceId,
-		SyncClient:      t.syncClient,
+		SyncClient:         t.syncClient,
-		Configuration:   t.configuration,
+		Configuration:      t.configuration,
-		HeadNotifiable:  t.headsNotifiable,
+		HeadNotifiable:     t.headsNotifiable,
-		Listener:        opts.Listener,
+		Listener:           opts.Listener,
-		AclList:         t.aclList,
+		AclList:            t.aclList,
-		SpaceStorage:    t.spaceStorage,
+		SpaceStorage:       t.spaceStorage,
-		OnClose:         t.onClose,
+		OnClose:            t.onClose,
-		SyncStatus:      t.syncStatus,
+		SyncStatus:         t.syncStatus,
-		PeerGetter:      t.peerManager,
+		PeerGetter:         t.peerManager,
-		BuildObjectTree: treeBuilder,
+		BuildObjectTree:    treeBuilder,
+		ValidateObjectTree: opts.TreeValidator,
 	}
 	t.treesUsed.Add(1)
 	t.log.Debug("incrementing counter", zap.String("id", id), zap.Int32("trees", t.treesUsed.Load()))

commonspace/settings/settingsobject.go

@@ -4,9 +4,13 @@ import (
 	"context"
 	"errors"
 	"fmt"
+
 	"github.com/anyproto/any-sync/commonspace/deletionmanager"
 	"github.com/anyproto/any-sync/util/crypto"
 
+	"github.com/gogo/protobuf/proto"
+	"go.uber.org/zap"
+
 	"github.com/anyproto/any-sync/accountservice"
 	"github.com/anyproto/any-sync/app/logger"
 	"github.com/anyproto/any-sync/commonspace/object/tree/objecttree"
@@ -18,8 +22,6 @@ import (
 	"github.com/anyproto/any-sync/commonspace/spacestorage"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/nodeconf"
-	"github.com/gogo/protobuf/proto"
-	"go.uber.org/zap"
 )
 
 var log = logger.NewNamed("common.commonspace.settings")
@@ -166,7 +168,10 @@ func (s *settingsObject) checkHistoryState(ctx context.Context) (err error) {
 }
 
 func (s *settingsObject) Close() error {
-	return s.SyncTree.Close()
+	if s.SyncTree != nil {
+		return s.SyncTree.Close()
+	}
+	return nil
 }
 
 var isDerivedRoot = objecttree.IsDerivedRoot

commonspace/spaceutils_test.go

@@ -6,6 +6,9 @@ import (
 	"testing"
 	"time"
 
+	"github.com/anyproto/go-chash"
+	"github.com/stretchr/testify/require"
+
 	accountService "github.com/anyproto/any-sync/accountservice"
 	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/app/ocache"
@@ -23,8 +26,6 @@ import (
 	"github.com/anyproto/any-sync/net/pool"
 	"github.com/anyproto/any-sync/nodeconf"
 	"github.com/anyproto/any-sync/testutil/accounttest"
-	"github.com/anyproto/go-chash"
-	"github.com/stretchr/testify/require"
 )
 
 //
@@ -282,6 +283,10 @@ func (n noOpSyncer) Close() error {
 type mockTreeSyncer struct {
 }
 
+func (m mockTreeSyncer) ShouldSync(peerId string) bool {
+	return false
+}
+
 func (m mockTreeSyncer) Init(a *app.App) (err error) {
 	return nil
 }
@@ -301,6 +306,9 @@ func (m mockTreeSyncer) Close(ctx context.Context) (err error) {
 func (m mockTreeSyncer) StartSync() {
 }
 
+func (m mockTreeSyncer) StopSync() {
+}
+
 func (m mockTreeSyncer) SyncAll(ctx context.Context, peerId string, existing, missing []string) error {
 	return nil
 }

coordinator/coordinatorproto/coordinator.pb.go

@@ -99,6 +99,31 @@ func (SpaceStatus) EnumDescriptor() ([]byte, []int) {
 	return fileDescriptor_d94f6f99586adae2, []int{1}
 }
 
+type SpacePermissions int32
+
+const (
+	SpacePermissions_SpacePermissionsUnknown SpacePermissions = 0
+	SpacePermissions_SpacePermissionsOwner   SpacePermissions = 1
+)
+
+var SpacePermissions_name = map[int32]string{
+	0: "SpacePermissionsUnknown",
+	1: "SpacePermissionsOwner",
+}
+
+var SpacePermissions_value = map[string]int32{
+	"SpacePermissionsUnknown": 0,
+	"SpacePermissionsOwner":   1,
+}
+
+func (x SpacePermissions) String() string {
+	return proto.EnumName(SpacePermissions_name, int32(x))
+}
+
+func (SpacePermissions) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_d94f6f99586adae2, []int{2}
+}
+
 // NodeType determines the type of API that a node supports
 type NodeType int32
 
@@ -142,7 +167,7 @@ func (x NodeType) String() string {
 }
 
 func (NodeType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_d94f6f99586adae2, []int{2}
+	return fileDescriptor_d94f6f99586adae2, []int{3}
 }
 
 // DeletionChangeType determines the type of deletion payload
@@ -171,7 +196,7 @@ func (x DeletionPayloadType) String() string {
 }
 
 func (DeletionPayloadType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_d94f6f99586adae2, []int{3}
+	return fileDescriptor_d94f6f99586adae2, []int{4}
 }
 
 type DeletionLogRecordStatus int32
@@ -202,7 +227,7 @@ func (x DeletionLogRecordStatus) String() string {
 }
 
 func (DeletionLogRecordStatus) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_d94f6f99586adae2, []int{4}
+	return fileDescriptor_d94f6f99586adae2, []int{5}
 }
 
 type SpaceSignRequest struct {
@@ -287,8 +312,9 @@ func (m *SpaceSignRequest) GetForceRequest() bool {
 }
 
 type SpaceStatusPayload struct {
-	Status            SpaceStatus `protobuf:"varint,1,opt,name=status,proto3,enum=coordinator.SpaceStatus" json:"status,omitempty"`
+	Status            SpaceStatus      `protobuf:"varint,1,opt,name=status,proto3,enum=coordinator.SpaceStatus" json:"status,omitempty"`
-	DeletionTimestamp int64       `protobuf:"varint,2,opt,name=deletionTimestamp,proto3" json:"deletionTimestamp,omitempty"`
+	DeletionTimestamp int64            `protobuf:"varint,2,opt,name=deletionTimestamp,proto3" json:"deletionTimestamp,omitempty"`
+	Permissions       SpacePermissions `protobuf:"varint,3,opt,name=permissions,proto3,enum=coordinator.SpacePermissions" json:"permissions,omitempty"`
 }
 
 func (m *SpaceStatusPayload) Reset()         { *m = SpaceStatusPayload{} }
@@ -338,6 +364,13 @@ func (m *SpaceStatusPayload) GetDeletionTimestamp() int64 {
 	return 0
 }
 
+func (m *SpaceStatusPayload) GetPermissions() SpacePermissions {
+	if m != nil {
+		return m.Permissions
+	}
+	return SpacePermissions_SpacePermissionsUnknown
+}
+
 type SpaceSignResponse struct {
 	Receipt *SpaceReceiptWithSignature `protobuf:"bytes,1,opt,name=receipt,proto3" json:"receipt,omitempty"`
 }
@@ -1995,6 +2028,7 @@ func (m *AclGetRecordsResponse) GetRecords() [][]byte {
 func init() {
 	proto.RegisterEnum("coordinator.ErrorCodes", ErrorCodes_name, ErrorCodes_value)
 	proto.RegisterEnum("coordinator.SpaceStatus", SpaceStatus_name, SpaceStatus_value)
+	proto.RegisterEnum("coordinator.SpacePermissions", SpacePermissions_name, SpacePermissions_value)
 	proto.RegisterEnum("coordinator.NodeType", NodeType_name, NodeType_value)
 	proto.RegisterEnum("coordinator.DeletionPayloadType", DeletionPayloadType_name, DeletionPayloadType_value)
 	proto.RegisterEnum("coordinator.DeletionLogRecordStatus", DeletionLogRecordStatus_name, DeletionLogRecordStatus_value)
@@ -2037,105 +2071,109 @@ func init() {
 }
 
 var fileDescriptor_d94f6f99586adae2 = []byte{
-	// 1567 bytes of a gzipped FileDescriptorProto
+	// 1626 bytes of a gzipped FileDescriptorProto
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+	0x97, 0xbe, 0x6a, 0x4d, 0xfa, 0xe6, 0xf9, 0x7c, 0x46, 0xfc, 0xbb, 0xfe, 0x4f, 0x00, 0x00, 0x00,
+	0xff, 0xff, 0x83, 0x2d, 0x56, 0x38, 0x1a, 0x15, 0x00, 0x00,
 }
 
 func (m *SpaceSignRequest) Marshal() (dAtA []byte, err error) {
@@ -2219,6 +2257,11 @@ func (m *SpaceStatusPayload) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if m.Permissions != 0 {
+		i = encodeVarintCoordinator(dAtA, i, uint64(m.Permissions))
+		i--
+		dAtA[i] = 0x18
+	}
 	if m.DeletionTimestamp != 0 {
 		i = encodeVarintCoordinator(dAtA, i, uint64(m.DeletionTimestamp))
 		i--
@@ -3453,6 +3496,9 @@ func (m *SpaceStatusPayload) Size() (n int) {
 	if m.DeletionTimestamp != 0 {
 		n += 1 + sovCoordinator(uint64(m.DeletionTimestamp))
 	}
+	if m.Permissions != 0 {
+		n += 1 + sovCoordinator(uint64(m.Permissions))
+	}
 	return n
 }
 
@@ -4261,6 +4307,25 @@ func (m *SpaceStatusPayload) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Permissions", wireType)
+			}
+			m.Permissions = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowCoordinator
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Permissions |= SpacePermissions(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipCoordinator(dAtA[iNdEx:])

coordinator/coordinatorproto/protos/coordinator.proto

@@ -75,9 +75,15 @@ enum SpaceStatus {
   SpaceStatusNotExists = 4;
 }
 
+enum SpacePermissions {
+  SpacePermissionsUnknown = 0;
+  SpacePermissionsOwner = 1;
+}
+
 message SpaceStatusPayload {
   SpaceStatus status = 1;
   int64 deletionTimestamp = 2;
+  SpacePermissions permissions = 3;
 }
 
 message SpaceSignResponse {