From 3451d56ead6e57f503962b876c89284f1fb73a90 Mon Sep 17 00:00:00 2001
From: Gabriel Arakaki Giovanini <mail@gabrielgio.me>
Date: Sat, 10 Sep 2022 17:33:30 +0200
Subject: ref: Create a storage interface

This `Storage` interface will define all the interactions with the
storage system. For now I plan to support native file system through
go's standard library and Nextcloud through *webdav*. So this is the
first step in that direction.
---
 storage/storage.go | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 storage/storage.go

(limited to 'storage/storage.go')

diff --git a/storage/storage.go b/storage/storage.go
new file mode 100644
index 0000000..b788efb
--- /dev/null
+++ b/storage/storage.go
@@ -0,0 +1,30 @@
+package storage
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"io"
+)
+
+type WalkMode int
+
+const (
+	Folder WalkMode = iota
+	File
+	FileFolder
+)
+
+type Storage interface {
+	Walk(path string, walkMode WalkMode) <-chan string
+	Get(path string) (io.Reader, error)
+}
+
+func CalculateSHA256(r io.Reader) (string, error) {
+	h := sha256.New()
+	if _, err := io.Copy(h, r); err != nil {
+		return "", err
+	}
+
+	return fmt.Sprintf("%x", h.Sum(nil)), nil
+
+}
-- 
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