first draft of file storage

app/storage/storage.go

@@ -25,7 +25,20 @@ func NewStorage(basepath string) *Storage {
 	return res
 }
 
-func (store *Storage) LinkFile(tmpname, collection, filename string) error {
+func (store *Storage) GetFileReader(collection, filename string) (io.ReadCloser, error) {
+	var err error
+	var res io.ReadCloser
+
+	filename = filepath.Join(store.basepath, collection, filename)
+	file, err := os.OpenFile(filename, os.O_RDONLY, 0)
+	if err != nil {
+		return res, err
+	}
+	res = file
+	return res, err
+}
+
+func (store *Storage) HardlinkFile(tmpname, collection, filename string) error {
 	var err error
 	dirname := filepath.Join(store.basepath, collection)
 	err = os.MkdirAll(dirname, 0750)
@@ -34,7 +47,7 @@ func (store *Storage) LinkFile(tmpname, collection, filename string) error {
 	}
 
 	filename = filepath.Join(store.basepath, collection, filename)
-	os.Remove(filename)
+	os.Remove(filename) // TODO
 
 	err = os.Link(tmpname, filename)
 	if err != nil {
@@ -74,3 +87,19 @@ func (store *Storage) WriteTempFile(source io.Reader) (string, int64, string, er
 
 	return tmppath, size, digest, err
 }
+
+func (store *Storage) DeleteFile(collection, filename string) error {
+	var err error
+	filename = filepath.Join(store.basepath, collection, filename)
+	err = os.Remove(filename)
+	if err != nil {
+		return err
+	}
+
+	dirname := filepath.Join(store.basepath, collection)
+	err = os.RemoveAll(dirname)
+	if err != nil {
+		return err
+	}
+	return err
+}