Improve library sync, add more config values

src/utils/filehash.go

@@ -1,32 +1,39 @@
 package utils
 
 import (
+	"encoding/binary"
 	"hash/fnv"
 	"io"
 	"mime/multipart"
 	"os"
 )
 
-func FileHashFromUpload(file multipart.File) (uint64, error) {
+func FileHashFromUpload(file multipart.File) (string, error) {
 	h := fnv.New64a()
 	if _, err := io.Copy(h, file); err != nil {
-		return 0, err
+		return "", err
 	}
 
-	return h.Sum64(), nil
+	return u64ToString(h.Sum64()), nil
 }
 
-func FileHash(path string) (uint64, error) {
+func FileHash(path string) (string, error) {
 	f, err := os.Open(path)
 	if err != nil {
-		return 0, err
+		return "", err
 	}
 	defer f.Close()
 
 	h := fnv.New64a()
 	if _, err := io.Copy(h, f); err != nil {
-		return 0, err
+		return "", err
 	}
 
-	return h.Sum64(), nil
+	return u64ToString(h.Sum64()), nil
+}
+
+func u64ToString(x uint64) string {
+	var b [8]byte
+	binary.LittleEndian.PutUint64(b[:], x)
+	return string(b[:])
 }