implement federated group sharing

[schiessle]

Allows you to share a file/folder with a group on a different server. The group is addressed similiar to a individual user: <groupname>@<server>. By default incoming and outgoing federated group shares are disabled in the admin settings.

• send federated group share
• individual user can accept share
• individual user can decline share
• individual user can unshare from self
• handle unshare notification from owner correctly
• handle permission change from owner correctly
• UI to create federated group share

Fixes #4252

[codecov]

Codecov Report

Merging #9895 into master will decrease coverage by 45.08%.
The diff coverage is 1.44%.

@@             Coverage Diff              @@
##             master   #9895       +/-   ##
============================================
- Coverage      51.4%   6.32%   -45.09%     
- Complexity    26411   26448       +37     
============================================
  Files          1690    1690               
  Lines         97712   97836      +124     
  Branches       1292    1290        -2     
============================================
- Hits          50233    6184    -44049     
- Misses        47479   91652    +44173

Impacted Files	Coverage Δ	Complexity Δ
core/js/share.js	44.55% <ø> (ø)	0 <0> (ø)	⬇️
...dfilesharing/composer/composer/autoload_static.php	0% <ø> (ø)	1 <0> (ø)	⬇️
apps/cloud_federation_api/appinfo/app.php	0% <0%> (ø)	0 <0> (ø)	⬇️
apps/cloud_federation_api/lib/Capabilities.php	0% <0%> (ø)	2 <2> (ø)	⬇️
...es_sharing/lib/Controller/ShareesAPIController.php	0% <0%> (-69.63%)	24 <2> (ø)
...s/federatedfilesharing/lib/AppInfo/Application.php	0% <0%> (-52.5%)	6 <1> (ø)
...ation/Exceptions/AuthenticationFailedException.php	0% <0%> (ø)	1 <1> (ø)	⬇️
apps/cloud_federation_api/lib/Config.php	0% <0%> (ø)	3 <3> (+1)	⬆️
lib/private/Federation/CloudFederationShare.php	0% <0%> (ø)	27 <27> (+2)	⬆️
...lesharing/lib/ocm/CloudFederationProviderFiles.php	0% <0%> (ø)	82 <82> (+8)	⬆️
... and 950 more

[MorrisJobke]

@schiessle Could you rebase to resolve the conflicts and have less changes as the other PR got merged.

[schiessle]

@MorrisJobke just done 🙂

[rullzer]

I would feel a lot more comfortable if you could extend (or copy) the federated integration tests and move them to group shares. Just so we know when it does 💥

[schiessle]

@rullzer I added some integration tests. Now it is your turn 😉

[rullzer]

Now the unit tests fail ;)

[rullzer]

And yay for tests!

[schiessle]

@rullzer unit tests should be fixed now

[MorrisJobke]

Fixes #4252

I added this to the OP 😉

[rullzer]

Yay lets do this!

[MorrisJobke]

Code makes sense 👍