feat: scaffold codespace backend

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

internal/service/file_service.go

@@ -0,0 +1,79 @@
+package service
+
+import (
+	"codespace/internal/fs"
+	"codespace/internal/workspace"
+)
+
+// FileService handles file operations within workspaces.
+type FileService struct {
+	workspaces workspace.Manager
+}
+
+// NewFileService creates a FileService.
+func NewFileService(workspaces workspace.Manager) *FileService {
+	return &FileService{workspaces: workspaces}
+}
+
+// List lists files at the given workspace-relative path.
+func (s *FileService) List(workspaceID, path string) ([]fs.FileInfo, error) {
+	ws, err := s.workspaces.Get(workspaceID)
+	if err != nil {
+		return nil, err
+	}
+	return fs.NewLocal(ws.Root).List(path)
+}
+
+// Read reads a file at the given workspace-relative path.
+func (s *FileService) Read(workspaceID, path string) ([]byte, error) {
+	ws, err := s.workspaces.Get(workspaceID)
+	if err != nil {
+		return nil, err
+	}
+	return fs.NewLocal(ws.Root).Read(path)
+}
+
+// Write writes data to a file at the given workspace-relative path.
+func (s *FileService) Write(workspaceID, path string, data []byte) error {
+	ws, err := s.workspaces.Get(workspaceID)
+	if err != nil {
+		return err
+	}
+	return fs.NewLocal(ws.Root).Write(path, data)
+}
+
+// Mkdir creates a directory at the given workspace-relative path.
+func (s *FileService) Mkdir(workspaceID, path string) error {
+	ws, err := s.workspaces.Get(workspaceID)
+	if err != nil {
+		return err
+	}
+	return fs.NewLocal(ws.Root).Mkdir(path)
+}
+
+// Remove removes a file or directory at the given workspace-relative path.
+func (s *FileService) Remove(workspaceID, path string) error {
+	ws, err := s.workspaces.Get(workspaceID)
+	if err != nil {
+		return err
+	}
+	return fs.NewLocal(ws.Root).Remove(path)
+}
+
+// Rename renames a file or directory from oldPath to newPath.
+func (s *FileService) Rename(workspaceID, oldPath, newPath string) error {
+	ws, err := s.workspaces.Get(workspaceID)
+	if err != nil {
+		return err
+	}
+	return fs.NewLocal(ws.Root).Rename(oldPath, newPath)
+}
+
+// Stat returns file info for the given workspace-relative path.
+func (s *FileService) Stat(workspaceID, path string) (*fs.FileInfo, error) {
+	ws, err := s.workspaces.Get(workspaceID)
+	if err != nil {
+		return nil, err
+	}
+	return fs.NewLocal(ws.Root).Stat(path)
+}