I’ve completed development work on OAuth support in pimsync. The implementation has been tested primary with NextCloud (both its built-in OAuth provider and the OIDC plugin), but should be usable with any CalDAV/CardDAV server using OAuth for authentication. It should also work with Google’s flavour of CalDAV, although this has yet to be tested. At this point, mostly the documentation is missing — the reference-level documentation is there, but a friendlier “how to” guide covering all the details is still pending. It’s both definitely planned and quite necessary. Implementation details[permalink] I wrote a sans-io OAuth library in Rust, liboauth, which...