Block sharing with selected groups.

[redblom]

• Resolves: Option to exclude native groups to share with for security perspective #49198

Summary

Continuation of PR #49217

Checklist

• Code is properly formatted
• Tests unit are included

[redblom]

Status: Fully functional
To exclude groups from sharing, as an admin, open Administration settings and navigate to Administration -> Sharing
Below the 'Allow sharing with groups' checkbox you can add/remove groups to exclude from sharing.
As a consequence these groups will not appear in the share dialog when searching for groups to share with.

[github-actions]

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[provokateurin]

Looks mostly fine to me, but you need to make cs-fixer happy.

[come-nc]

Looks fine, did not test.

Would be better to do the check in the hideFromCollaboration method on groups, as the method is part of OCP and could be used by other apps.

[redblom]

Looks fine, did not test.

Would be better to do the check in the hideFromCollaboration method on groups, as the method is part of OCP and could be used by other apps.

Please correct me if I'm wrong but as far as I can tell the IHideFromCollaborationBackend isn't implemented anywhere and $group->hideFromCollaboration() currently always returns false.
So perhaps leave this for now (with a comment) until that implementation has been done, or at least implement that in another PR. What do you think?

[susnux]

Please correct me if I'm wrong but as far as I can tell the IHideFromCollaborationBackend isn't implemented anywhere and $group->hideFromCollaboration() currently always returns false.

You can add your code (the check of the config option) inside of hideFromCollaboration:

server/lib/private/Group/Group.php

Line 378 in 4f50b5f

public function hideFromCollaboration(): bool {

Here you would add it like:

  public function hideFromCollaboration(): bool {
+ 	$groupsBlockList = $this->appConfig->getValueArray('core', 'shareapi_groups_block_list', []);
- 	return array_reduce($this->backends, function (bool $hide, GroupInterface $backend) {
+ 	return in_array($this->gid, $groupsBlockList)
+ 		|| array_reduce($this->backends, function (bool $hide, GroupInterface $backend) {

[come-nc]

Looks fine, did not test.
Would be better to do the check in the hideFromCollaboration method on groups, as the method is part of OCP and could be used by other apps.

Please correct me if I'm wrong but as far as I can tell the IHideFromCollaborationBackend isn't implemented anywhere and $group->hideFromCollaboration() currently always returns false. So perhaps leave this for now (with a comment) until that implementation has been done, or at least implement that in another PR. What do you think?

I do not know about the backends, but in this case you do not care about the backend you can implement that directly in nextcloud/server/lib/private/Group/Group.php
It’s always this class that represents a group, whatever its backend.

[provokateurin]

I only have a few small remarks, the approach and logic looks good to me!

[susnux]

Tests need to be adjusted:

1. Test\Group\GroupTest::testGetUsersSingleBackend
   ArgumentCountError: Too few arguments to function OC\Group\Group::__construct(), 4 passed in /home/runner/actions-runner/_work/server/server/tests/lib/Group/GroupTest.php on line 68 and at least 5 expected

/home/runner/actions-runner/_work/server/server/lib/private/Group/Group.php:55
/home/runner/actions-runner/_work/server/server/tests/lib/Group/GroupTest.php:68