Since for external shares there is no need for link shares to be enabled
we should check which controller is actually being called.
This makes sure that in all cases we verify that the files_sharing app
is enabled. But only for the share controller (public shares) we check
if the API is enabled and if links are enabled.
TODO: add checks for federated sharing as well
The sharing backend may throw another exception for example when the activity app encounters a problem. Previously this just triggered a 404 error page and the exception got not logged at all. With this change such exceptions get not intercepted and regularly handled as exceptions so that we have meaningful log data. Also the user will be shown a window informing him that an error happened.
Helps to debug cases such as https://github.com/owncloud/core/issues/19465
If the sharing API setting is disabled that sharing check middle ware
should block the request. Thus making link shares unavailable.
Fixes#18970
* Unit test added
* Unit tests updated
Roeland Jago Douma
Lukas Reschke
Morris Jobke
Joas Schilling
Jenkins for ownCloud
Thomas Müller