lib/src/locator.dart starts with the addresses of spec 44.1, a port of
CheckURI and Address.Host of package locator of datekeys-go: the same
checks in the same order and the same texts, on the UTF-8 of the address,
with Go's %q of the first byte that RFC 3986 does not allow. And
checkResolvedIp, the check of the IP that a name resolves to, which a
reader runs on every connection: the classification of publicIP on the 4
or 16 bytes of an address, an IPv4-mapped one not public. Go has no such
function, since its reader does not download.
lib/src/ipaddr.dart, internal, parses IPv4 and IPv6 with the exact
acceptance of netip.ParseAddr, writes them as its String, and classifies
them as publicIP, with the blocks of spec 44.1. It works byte by byte, so
that the 128 bits of IPv6 stay exact on the web, and never uses dart:io.
The tests run the 247 addresses of locator.json and the 2 800 of the
vectors, the 1 700 strings of netip and the 868 byte strings of publicIP,
on the VM and on Node.js.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
