Add chunked uploads (Resumable curently broken)

internal/util/util.go

@@ -2,6 +2,7 @@ package util
 
 import (
 	"fmt"
+	"math/rand"
 	"strings"
 )
 
@@ -41,3 +42,12 @@ func SafeFilename(name string) string {
 	}
 	return string(out)
 }
+
+func RandomString(n int) string {
+	const letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}