+var v2tokenUnderscore = regexp.MustCompile(`^v2_[a-z0-9]{5}-gj3su-[a-z0-9]{15}_`)
+
+func unescapeKey(key string) string {
+ if v2tokenUnderscore.MatchString(key) {
+ // Entire Arvados token, with "/" replaced by "_" to
+ // avoid colliding with the Authorization header
+ // format.
+ return strings.Replace(key, "_", "/", -1)
+ } else if s, err := url.PathUnescape(key); err == nil {
+ return s
+ } else {
+ return key
+ }
+}
+