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libstore: Improve store-reference back-compat with IPv6 ZoneId literals

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This restores the pre-2.31 handling of ZoneID identifiers in store references.
It's the only place we reasonably care about this back-compat.
This commit is contained in:
Sergei Zimmerman 2025-11-01 00:36:15 +03:00
parent 4a2fb18ba0
commit 8dbc2475f7
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8 changed files with 92 additions and 2 deletions
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28
src/libstore/store-reference.cc
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@ -121,7 +121,27 @@ StoreReference StoreReference::parse(const std::string & uri, const StoreReferen
* greedily assumed to be the part of the host address. */
auto authorityString = schemeAndAuthority->authority;
auto userinfo = splitPrefixTo(authorityString, '@');
auto maybeIpv6 = boost::urls::parse_ipv6_address(authorityString);
/* Back-compat shim for ZoneId specifiers. Technically this isn't
* standard, but the expectation is this works with the old syntax
* for ZoneID specifiers. For the full story behind the fiasco that
* is ZoneID in URLs look at [^].
* [^]: https://datatracker.ietf.org/doc/html/draft-schinazi-httpbis-link-local-uri-bcp-03
*/
/* Fish out the internals from inside square brackets. It might be that the pct-sign is unencoded and that's
* why we failed to parse it previously. */
if (authorityString.starts_with('[') && authorityString.ends_with(']')) {
authorityString.remove_prefix(1);
authorityString.remove_suffix(1);
}
auto maybeBeforePct = splitPrefixTo(authorityString, '%');
bool hasZoneId = maybeBeforePct.has_value();
auto maybeZoneId = hasZoneId ? std::optional{authorityString} : std::nullopt;
std::string_view maybeIpv6S = maybeBeforePct.value_or(authorityString);
auto maybeIpv6 = boost::urls::parse_ipv6_address(maybeIpv6S);
if (maybeIpv6) {
std::string fixedAuthority;
if (userinfo) {
@ -129,7 +149,11 @@ StoreReference StoreReference::parse(const std::string & uri, const StoreReferen
fixedAuthority += '@';
}
fixedAuthority += '[';
fixedAuthority += authorityString;
fixedAuthority += maybeIpv6S;
if (maybeZoneId) {
fixedAuthority += "%25"; // pct-encoded percent character
fixedAuthority += *maybeZoneId;
}
fixedAuthority += ']';
return {
.variant =