Initialize AutoLibrary website with Gitea deployment

backend/services/theme_files/store.go

@@ -0,0 +1,69 @@
+package theme_files
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// Store owns writes under a single configured storage directory. Replacing an
+// archive uses a temporary file so readers never receive partially written ZIPs.
+type Store struct{ root string }
+
+func NewStore(root string) (*Store, error) {
+	absolute, err := filepath.Abs(root)
+	if err != nil {
+		return nil, err
+	}
+	if err := os.MkdirAll(filepath.Join(absolute, "previews"), 0755); err != nil {
+		return nil, err
+	}
+	return &Store{root: absolute}, nil
+}
+func (s *Store) Root() string { return s.root }
+func (s *Store) checked(path string) (string, error) {
+	absolute, err := filepath.Abs(path)
+	if err != nil {
+		return "", err
+	}
+	relative, err := filepath.Rel(s.root, absolute)
+	if err != nil || relative == "." || relative == ".." || strings.HasPrefix(relative, ".."+string(filepath.Separator)) || filepath.IsAbs(relative) {
+		return "", fmt.Errorf("file path is outside theme storage")
+	}
+	return absolute, nil
+}
+func (s *Store) WriteFile(path string, data []byte, mode os.FileMode) error {
+	target, err := s.checked(path)
+	if err != nil {
+		return err
+	}
+	file, err := os.CreateTemp(filepath.Dir(target), ".upload-*")
+	if err != nil {
+		return err
+	}
+	temp := file.Name()
+	defer os.Remove(temp)
+	if _, err := file.Write(data); err != nil {
+		file.Close()
+		return err
+	}
+	if err := file.Chmod(mode); err != nil {
+		file.Close()
+		return err
+	}
+	if err := file.Close(); err != nil {
+		return err
+	}
+	return os.Rename(temp, target)
+}
+func (s *Store) Remove(path string) error {
+	target, err := s.checked(path)
+	if err != nil {
+		return err
+	}
+	if err := os.Remove(target); err != nil && !os.IsNotExist(err) {
+		return err
+	}
+	return nil
+}