From b4990cd858c548b3a802a656655693723d1a981b Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Thu, 2 Jan 2025 15:52:30 +0000
Subject: [PATCH] lib/bucket: add IsAllSlashes function

---
 lib/bucket/bucket.go      | 15 +++++++++++++++
 lib/bucket/bucket_test.go | 18 ++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/lib/bucket/bucket.go b/lib/bucket/bucket.go
index 44aac0bb3..9b0b31afd 100644
--- a/lib/bucket/bucket.go
+++ b/lib/bucket/bucket.go
@@ -42,6 +42,21 @@ func Join(path1, path2 string) string {
 	return strings.TrimSuffix(path1, "/") + "/" + strings.TrimPrefix(path2, "/")
 }
 
+// IsAllSlashes returns true if s is all / characters.
+//
+// It returns false if s is "".
+func IsAllSlashes(s string) bool {
+	if len(s) == 0 {
+		return false
+	}
+	for _, c := range s {
+		if c != '/' {
+			return false
+		}
+	}
+	return true
+}
+
 // Cache stores whether buckets are available and their IDs
 type Cache struct {
 	mu       sync.Mutex      // mutex to protect created and deleted
diff --git a/lib/bucket/bucket_test.go b/lib/bucket/bucket_test.go
index 1a36ea300..df4b7d95b 100644
--- a/lib/bucket/bucket_test.go
+++ b/lib/bucket/bucket_test.go
@@ -45,6 +45,24 @@ func TestJoin(t *testing.T) {
 	}
 }
 
+func TestIsAllSlashes(t *testing.T) {
+	for _, test := range []struct {
+		in   string
+		want bool
+	}{
+		{in: "", want: false},
+		{in: "/", want: true},
+		{in: "x/", want: false},
+		{in: "/x", want: false},
+		{in: "//", want: true},
+		{in: "/x/", want: false},
+		{in: "///", want: true},
+	} {
+		got := IsAllSlashes(test.in)
+		assert.Equal(t, test.want, got, test.in)
+	}
+}
+
 func TestCache(t *testing.T) {
 	c := NewCache()
 	errBoom := errors.New("boom")