Support UnifiedPush Connector 3.x

[ArnyminerZ]

Tip

Cannot properly test because we still do not support encryption with our current implementation of DAVPush.

Depends on bitfireAT/dav4jvm#64

Purpose

Upgrade the UnifiedPush connector version to the latest one (3.0.4). This one includes built-in support for message encryption.

Also gives support to DAVPush encryption with VAPID and message encryption.

Right now we do not have any working server and/or implemented with support for push with encryption, so I'm not sure how to test it.

Short description

• Upgrade UnifiedPush Connector.
  Note that there seems to be a bug in a dependency they use, so they import it locally:

  https://github.com/UnifiedPush/android-connector/blob/28cb0d622ed0a972996041ab9cc85b701abc48c6/connector/build.gradle#L56-L59

  It breaks the build because of duplicated libraries, so I've had to exclude it from UnifiedPush. I guess that when Fix spec compliant record size verification tink-crypto/tink-java-apps#5 is merged they will release a new version.

For some reason push is broken right now, I don't know if it's our fault, UnifiedPush's fault, or the Nextcloud server's fault.

Checklist

• The PR has a proper title, description and label.
• I have self-reviewed the PR.
• I have added documentation to complex functions and functions that can be used by other modules.
• I have added reasonable tests or consciously decided to not add tests.

[github-actions]

This PR/issue depends on:

• Latest elements from WebDAV-Push dav4jvm#64

[p1gp1g]

It breaks the build because of duplicated libraries, so I've had to exclude it from UnifiedPush. I guess that when tink-crypto/tink-java-apps#5 is merged they will release a new version.

Even when using the upstream version you'd have the same issue. It means you have another dependency using tink (or another dependency). You'll probably want to see what other dependency depends on it to check it uses an updated version of tink. You may want to explicitly depend on tink to control the version.

By the way, the upstream tink:webpush-app uses an outdated tink, see: https://codeberg.org/UnifiedPush/android-connector/issues/5#issue-1037639