14.1.6 Share expiry date + WebDAV/JSON fixes

Highlights

A feature + bug-fix release. Drop-in replacement for 14.1.5.

New

• Set an expiration date when creating a share. doShare / doShareAsync gained an optional LocalDate expireDate parameter (issue #76). The existing overloads are unchanged, so this is fully backwards compatible.

Fixes

• Empty results no longer crash JSON parsing. The OCS API serializes empty collections as [] instead of {}, which previously threw a MismatchedInputException (e.g. when listing users or groups on an empty result). Empty collections now parse correctly (issue #112).
• File uploads work on non-standard ports. Preemptive authentication now uses the configured port, so servers reachable on a non-standard port (e.g. behind a reverse proxy) no longer issue an auth challenge that a streamed upload could not retry (issue #112).

Testing / CI

• Integration tests can now auto-provision a throw-away Nextcloud server via Testcontainers when Docker is available, and run on every push and pull request in GitHub Actions. The full suite passes against a clean Nextcloud 31.

Requires Java 11+.