The previous commit bought the library back on VPN/remote hosts by declaring
NSAllowsArbitraryLoads, which works but is blunt: it drops ATS for ALL of the
app's URLSession traffic, and the only other traffic is third-party cover-art
CDN fetches -- the one surface we never wanted to open. It cost the TLS-version
floor, forward secrecy, and the cleartext-HTTP block on URLs the host supplies
at runtime (custom entries and scanner plugins carry arbitrary ones).
So take the host out of the URL loading system instead. MgmtTransport speaks
HTTPS over Network.framework, which ATS does not govern, and states the trust
rule we actually mean in a verify block: the leaf must hash to the fingerprint
pinned during PIN pairing. That is the same rule punktfunk-core has always
applied on the QUIC stream plane -- which is exactly why streaming kept working
over Tailscale while the library did not.
With that, the ATS dict is gone and ATS is fully enforced again. Cover-art CDN
fetches keep ordinary URLSession with full system trust evaluation and no client
certificate. LibraryTLSDelegate is deleted; nothing pins through URLSession now.
Also here:
- HTTPResponse: just enough HTTP/1.1 to read one GET -- status, headers,
Content-Length and chunked framing (hyper streams the art proxy chunked). A
body shorter than Content-Length throws instead of returning partial JSON,
which would otherwise read as "this host has no games".
- LibraryError.pinMismatch, so a re-keyed host says "pair again" rather than
sending someone to debug their network.
- 403 joins 401 as "unauthorized": both are the host declining the certificate.
- baseURL brackets IPv6 literals; the old string interpolation did not.
- 11 tests covering the framings hyper emits and the failure modes that would
otherwise be silent.
Known trade-off: no connection reuse yet, so each poster costs its own
handshake where the pooled URLSession shared one. Fine on a LAN, worth revisiting
for large libraries over a high-latency link.
enricobuehler
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