fix(share): delete exact directory share on trailing-slash delete (GHSA-pp88-jhwj-5qh5)

DeleteWithPathPrefix queried the share index with the raw path, so deleting a
directory through a trailing-slash path (e.g. DELETE /api/resources/a/) only
matched descendants like /a/child and missed the exact /a share, leaving it in
storage. If the same path was later recreated, the stale public share re-exposed
the new content. Normalize the path before the prefix query so the exact share
and its descendants are both removed. Adds a regression test.

storage/bolt/share.go

@@ -78,16 +78,17 @@ func (s shareBackend) Delete(hash string) error {
 }
 
 func (s shareBackend) DeleteWithPathPrefix(pathPrefix string, userID uint) error {
+	// Share paths are stored without a trailing slash
+	prefix := strings.TrimRight(pathPrefix, "/")
+
 	var links []share.Link
-	if err := s.db.Prefix("Path", pathPrefix, &links); err != nil {
+	if err := s.db.Prefix("Path", prefix, &links); err != nil {
 		if errors.Is(err, storm.ErrNotFound) {
 			return nil
 		}
 		return err
 	}
 
-	prefix := strings.TrimRight(pathPrefix, "/")
-
 	var err error
 	for _, link := range links {
 		if link.UserID != userID {

storage/bolt/share_test.go

@@ -84,6 +84,44 @@ func TestDeleteWithPathPrefix(t *testing.T) {
 	}
 }
 
+// Regression for the trailing-slash delete leaving a stale share
+// (GHSA-pp88-jhwj-5qh5): deleting "/a/" must remove the exact "/a" share and its
+// descendants, not just the descendants. Siblings and other users are untouched.
+func TestDeleteWithPathPrefixTrailingSlash(t *testing.T) {
+	t.Parallel()
+
+	s := newTestShareBackend(t)
+
+	links := []*share.Link{
+		{Hash: "u1-a", Path: "/a", UserID: 1},
+		{Hash: "u1-a-child", Path: "/a/child.txt", UserID: 1},
+		{Hash: "u1-abc", Path: "/abc", UserID: 1}, // sibling sharing a byte prefix
+		{Hash: "u2-a", Path: "/a", UserID: 2},      // other user, must remain
+	}
+	for _, l := range links {
+		if err := s.Save(l); err != nil {
+			t.Fatalf("failed to save link %s: %v", l.Hash, err)
+		}
+	}
+
+	// Delete with a trailing slash, as the resource delete handler does for a
+	// directory request like DELETE /api/resources/a/.
+	if err := s.DeleteWithPathPrefix("/a/", 1); err != nil {
+		t.Fatalf("DeleteWithPathPrefix returned error: %v", err)
+	}
+
+	got := remainingHashes(t, s)
+	want := []string{"u1-abc", "u2-a"}
+	if len(got) != len(want) {
+		t.Fatalf("remaining hashes = %v, want %v", got, want)
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("remaining hashes = %v, want %v", got, want)
+		}
+	}
+}
+
 func TestDeleteWithPathPrefixNoMatch(t *testing.T) {
 	t.Parallel()