Allow apps to add dav collections

[rullzer]

We have an event now to add plugins by apps.

server/apps/dav/lib/Server.php

Line 178 in 5011142

$dispatcher->dispatch('OCA\DAV\Connector\Sabre::addPlugin', $event);

However, it would also make sense to allow apps to register collections on the new dav endpoint:

So basically in

server/apps/dav/lib/RootCollection.php

Line 109 in 5011142

$children = [

This would allow us to start writing dav endpoints for trashbin and versions etc.

The way I see it there are two approaches here:

1. Dispatch an event

• Pro: Very easy
• Con: How to make sure 3rdparty app doesn't hijack the versions/trashbin endpoints?

2. Add and entry in info.xml there is then a sort of collections manager?

• Pro: We can give higher preference to "official" apps.
• Cons: more enginering work

Opinions: @MorrisJobke @nickvergessen @blizzz @schiessle @georgehrke

[juliusknorr]

#6835 also allows adding collections to the root collection, so this is basically the second approach, but currently it is indeed possible to overwrite "official" collections from within apps.

server/apps/dav/lib/Server.php

Lines 276 to 278 in 5011142

	foreach ($pluginManager->getAppCollections() as $appCollection) {
	$root->addChild($appCollection);
	}

https://github.com/nextcloud/appstore/pull/527/files#diff-d37c6b239400622b3c3d8738037e9bddR288

[rullzer]

Mmmm how did I miss that :P