vor temaplte

internal/filesvc/memstore.go

@@ -11,15 +11,13 @@ import (
 type MemStore struct {
 	mu    sync.Mutex
 	items map[ID]File
-
+	self  string
 	// optionales Eventing
 	subs []chan ChangeEvent
 }
 
-func NewMemStore() *MemStore {
-	return &MemStore{
-		items: make(map[ID]File),
-	}
+func NewMemStore(self string) *MemStore {
+	return &MemStore{self: strings.TrimSpace(self), items: make(map[ID]File)}
 }
 
 /*** Store ***/
@@ -102,7 +100,7 @@ func (m *MemStore) Create(_ context.Context, name string) (File, error) {
 	if err != nil {
 		return File{}, err
 	}
-	it := File{ID: uid, Name: name, UpdatedAt: now}
+	it := File{ID: uid, Name: name, UpdatedAt: now, Owner: m.self}
 	m.items[it.ID] = it
 	m.emit(it)
 	return it, nil
@@ -120,7 +118,10 @@ func (m *MemStore) Rename(_ context.Context, id ID, newName string) (File, error
 	if !ok || it.Deleted {
 		return File{}, ErrNotFound
 	}
-	it.Name = newName
+	if it.Owner != "" && it.Owner != m.self { // ← nur Owner
+		return File{}, ErrForbidden
+	}
+	it.Name = strings.TrimSpace(newName)
 	it.UpdatedAt = time.Now().UnixNano()
 	m.items[id] = it
 	m.emit(it)
@@ -134,6 +135,9 @@ func (m *MemStore) Delete(_ context.Context, id ID) (File, error) {
 	if !ok {
 		return File{}, ErrNotFound
 	}
+	if it.Owner != "" && it.Owner != m.self { // ← nur Owner
+		return File{}, ErrForbidden
+	}
 	if it.Deleted {
 		return it, nil
 	}
@@ -144,6 +148,31 @@ func (m *MemStore) Delete(_ context.Context, id ID) (File, error) {
 	return it, nil
 }
 
+func (m *MemStore) TakeoverOwner(_ context.Context, id ID, newOwner string) (File, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	it, ok := m.items[id]
+	if !ok || it.Deleted {
+		return File{}, ErrNotFound
+	}
+	newOwner = strings.TrimSpace(newOwner)
+	if newOwner == "" {
+		return File{}, ErrBadInput
+	}
+	// Sicherheit: nur für sich selbst übernehmen
+	if newOwner != m.self {
+		return File{}, ErrForbidden
+	}
+	if it.Owner == newOwner {
+		return it, nil
+	}
+	it.Owner = newOwner
+	it.UpdatedAt = time.Now().UnixNano()
+	m.items[id] = it
+	m.emitLocked(it)
+	return it, nil
+}
+
 /*** Replicable ***/
 
 func (m *MemStore) Snapshot(_ context.Context) (Snapshot, error) {
@@ -162,6 +191,10 @@ func (m *MemStore) ApplyRemote(_ context.Context, s Snapshot) error {
 	for _, ri := range s.Items {
 		li, ok := m.items[ri.ID]
 		if !ok || ri.UpdatedAt > li.UpdatedAt {
+			// Owner nie überschreiben, außer er ist leer
+			if ok && li.Owner != "" && ri.Owner != "" && ri.Owner != li.Owner {
+				ri.Owner = li.Owner
+			}
 			m.items[ri.ID] = ri
 			m.emitLocked(ri)
 		}