feat: allow to write to notes

server/internal/adapters/fs.go

@@ -257,6 +257,66 @@ func (l *LocalFsAdapter) Read(path string) (*Entry, error) {
 }
 
 func (l *LocalFsAdapter) Write(path string, content []byte) error {
+	pathParts := strings.Split(strings.Trim(path, "/"), "/")
+	if len(pathParts) == 0 || pathParts[0] == "" {
+		return errors.New("invalid path")
+	}
+
+	rootIdentifier := pathParts[0]
+	var targetRoot string
+	for _, r := range l.roots {
+		if filepath.Base(r) == rootIdentifier {
+			targetRoot = r
+			break
+		}
+	}
+
+	if targetRoot == "" {
+		return ErrNotFound
+	}
+
+	subPath := filepath.Join(pathParts[1:]...)
+	target := filepath.Join(targetRoot, subPath)
+
+	absTarget, err := filepath.Abs(target)
+	if err != nil {
+		return err
+	}
+	absRoot, err := filepath.Abs(targetRoot)
+	if err != nil {
+		return err
+	}
+	if !strings.HasPrefix(absTarget, absRoot) {
+		return errors.New("path escapes root")
+	}
+
+	dir := filepath.Dir(absTarget)
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return fmt.Errorf("failed to create directory: %w", err)
+	}
+
+	err = os.WriteFile(absTarget, content, 0o644)
+	if err != nil {
+		return err
+	}
+
+	// Invalidate cache
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	currentPath := path
+	for {
+		delete(l.cache, currentPath)
+		if currentPath == "/" {
+			break
+		}
+		lastSlash := strings.LastIndex(currentPath, "/")
+		if lastSlash <= 0 {
+			currentPath = "/"
+		} else {
+			currentPath = currentPath[:lastSlash]
+		}
+	}
+
 	return nil
 }