Move all the code to a lib folder

lib/storage/storage.go

@@ -0,0 +1,63 @@
+package storage
+
+import (
+	p "path"
+
+	"io"
+	"os"
+)
+
+type Store struct {
+	path string
+}
+
+type File interface {
+	io.ReadCloser
+	io.ReaderAt
+	Stat() (fi os.FileInfo, err error)
+}
+
+func Init(path string) (*Store, error) {
+	st := new(Store)
+	st.path = path
+
+	_, err := os.Stat(path)
+	if err != nil {
+		err = mkstore(st.path)
+	}
+	return st, err
+}
+
+func (st *Store) Create(id string, name string) (io.WriteCloser, error) {
+	path := idPath(st.path, id)
+	err := os.MkdirAll(path, os.ModePerm)
+	if err != nil {
+		return nil, err
+	}
+
+	return os.Create(p.Join(path, name))
+}
+
+func (st *Store) Store(id string, file io.Reader, name string) (size int64, err error) {
+	dest, err := st.Create(id, name)
+	if err != nil {
+		return 0, err
+	}
+	defer dest.Close()
+
+	return io.Copy(dest, file)
+}
+
+func (st *Store) Get(id string, name string) (File, error) {
+	path := idPath(st.path, id)
+	return os.Open(p.Join(path, name))
+}
+
+func (st *Store) Delete(id string) error {
+	path := idPath(st.path, id)
+	return os.RemoveAll(path)
+}
+
+func (st *Store) del() {
+	os.RemoveAll(st.path)
+}