first commit

apps/backend/internal/filestorage/local.go

@@ -0,0 +1,86 @@
+package filestorage
+
+import (
+	"context"
+	"errors"
+	"io"
+	"os"
+	"path/filepath"
+)
+
+type LocalStorage struct {
+	root string
+}
+
+func NewLocal(root string) *LocalStorage {
+	return &LocalStorage{root: root}
+}
+
+func (l *LocalStorage) Provider() string {
+	return "local"
+}
+
+func (l *LocalStorage) Probe(_ context.Context) error {
+	if err := os.MkdirAll(l.root, 0o755); err != nil {
+		return err
+	}
+	probePath := filepath.Join(l.root, ".healthcheck")
+	file, err := os.OpenFile(probePath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o644)
+	if err != nil {
+		return err
+	}
+	if err := file.Close(); err != nil {
+		return err
+	}
+	_ = os.Remove(probePath)
+	return nil
+}
+
+func (l *LocalStorage) Put(_ context.Context, key string, reader io.Reader, _ string, _ int64) error {
+	path := filepath.Join(l.root, filepath.Clean(key))
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		return err
+	}
+	file, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	if _, err := io.Copy(file, reader); err != nil {
+		_ = file.Close()
+		_ = os.Remove(path)
+		return err
+	}
+	return file.Close()
+}
+
+func (l *LocalStorage) Get(_ context.Context, key string) (Object, error) {
+	path := filepath.Join(l.root, filepath.Clean(key))
+	file, err := os.Open(path)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return Object{}, ErrNotFound
+		}
+		return Object{}, err
+	}
+	info, err := file.Stat()
+	if err != nil {
+		_ = file.Close()
+		return Object{}, err
+	}
+	if info.IsDir() {
+		_ = file.Close()
+		return Object{}, ErrNotFound
+	}
+	return Object{
+		Body: file,
+		Size: info.Size(),
+	}, nil
+}
+
+func (l *LocalStorage) Delete(_ context.Context, key string) error {
+	path := filepath.Join(l.root, filepath.Clean(key))
+	if err := os.Remove(path); err != nil && !errors.Is(err, os.ErrNotExist) {
+		return err
+	}
+	return nil
+}