supports local file system object storage and use it as the default avatar provider

pkg/storage/local_filesystem_storage.go

@@ -0,0 +1,68 @@
+package storage
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/mayswind/ezbookkeeping/pkg/settings"
+	"github.com/mayswind/ezbookkeeping/pkg/utils"
+)
+
+// LocalFileSystemObjectStorage represents local file system object storage
+type LocalFileSystemObjectStorage struct {
+	rootPath string
+}
+
+// NewLocalFileSystemObjectStorage returns a local file system object storage
+func NewLocalFileSystemObjectStorage(config *settings.Config, pathPrefix string) (*LocalFileSystemObjectStorage, error) {
+	storage := &LocalFileSystemObjectStorage{
+		rootPath: filepath.Join(config.LocalFileSystemPath, pathPrefix),
+	}
+
+	if err := os.MkdirAll(storage.rootPath, os.ModePerm); err != nil {
+		return nil, err
+	}
+
+	return storage, nil
+}
+
+// Exists returns whether the file exists
+func (s *LocalFileSystemObjectStorage) Exists(path string) (bool, error) {
+	return utils.IsExists(s.getFinalPath(path))
+}
+
+// Read returns the object instance according to specified the file path
+func (s *LocalFileSystemObjectStorage) Read(path string) (ObjectInStorage, error) {
+	return os.Open(s.getFinalPath(path))
+}
+
+// Save returns whether save the object instance successfully
+func (s *LocalFileSystemObjectStorage) Save(path string, object ObjectInStorage) error {
+	finalPath := s.getFinalPath(path)
+
+	if err := os.MkdirAll(filepath.Dir(finalPath), os.ModePerm); err != nil {
+		return err
+	}
+
+	targetFile, err := os.Create(finalPath)
+
+	if err != nil {
+		return err
+	}
+
+	defer targetFile.Close()
+
+	_, err = io.Copy(targetFile, object)
+
+	return err
+}
+
+// Delete returns whether delete the object according to specified the file path successfully
+func (s *LocalFileSystemObjectStorage) Delete(path string) error {
+	return os.Remove(s.getFinalPath(path))
+}
+
+func (s *LocalFileSystemObjectStorage) getFinalPath(path string) string {
+	return filepath.Join(s.rootPath, path)
+}