From f3d3587ab39130e8d87d290b8cedabb3e6e9d715 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9ophane=20Hufschmitt?= <theophane@hufschmitt.net>
Date: Thu, 7 Apr 2022 21:09:39 +0200
Subject: [PATCH] Allow empty path segments in urls

Valid per https://datatracker.ietf.org/doc/html/rfc3986#section-3.3 (and
also somewhat frequently happening for local paths)
---
 src/libutil/tests/url.cc | 4 ++--
 src/libutil/url-parts.hh | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/libutil/tests/url.cc b/src/libutil/tests/url.cc
index f20e2dc41..c3b233797 100644
--- a/src/libutil/tests/url.cc
+++ b/src/libutil/tests/url.cc
@@ -178,7 +178,7 @@ namespace nix {
     }
 
     TEST(parseURL, parseFileURLWithQueryAndFragment) {
-        auto s = "file:///none/of/your/business";
+        auto s = "file:///none/of//your/business";
         auto parsed = parseURL(s);
 
         ParsedURL expected {
@@ -186,7 +186,7 @@ namespace nix {
             .base = "",
             .scheme = "file",
             .authority = "",
-            .path = "/none/of/your/business",
+            .path = "/none/of//your/business",
             .query = (StringMap) { },
             .fragment = "",
         };
diff --git a/src/libutil/url-parts.hh b/src/libutil/url-parts.hh
index da10a6bbc..d5e6a2736 100644
--- a/src/libutil/url-parts.hh
+++ b/src/libutil/url-parts.hh
@@ -18,7 +18,7 @@ const static std::string userRegex = "(?:(?:" + unreservedRegex + "|" + pctEncod
 const static std::string authorityRegex = "(?:" + userRegex + "@)?" + hostRegex + "(?::[0-9]+)?";
 const static std::string pcharRegex = "(?:" + unreservedRegex + "|" + pctEncoded + "|" + subdelimsRegex + "|[:@])";
 const static std::string queryRegex = "(?:" + pcharRegex + "|[/? \"])*";
-const static std::string segmentRegex = "(?:" + pcharRegex + "+)";
+const static std::string segmentRegex = "(?:" + pcharRegex + "*)";
 const static std::string absPathRegex = "(?:(?:/" + segmentRegex + ")*/?)";
 const static std::string pathRegex = "(?:" + segmentRegex + "(?:/" + segmentRegex + ")*/?)";