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Without CSRF check this file might be tricked into requesting itself which would result in an endless loop and thus potentially ending in a Denial of Service.

get correct user for paths to the trash bin, needed for remote shares if the size of of trash gets calculated

This is needed for Dropbox and others that need a token.

Because setStorageId now instantiates storages, they might throw
exceptions if arguments are missing.

This fixes the unit test to not throw exceptions and have their default
config arguments set.

When accepting a remote share, an ajax request is sent to the server.
Only once this request returns should the file list be reloaded.

This removes the logic that registers the share action and modifies the
rows. Share actions aren't needed in the public file list.

certificate manager should always use a \OC\Files\View otherwise we will get problems for different primary storages

use uid provided by setupfs hook to mount server2server shares, otherwise mount will fail for public link shares

Whenever an exception occurs during scan of a remote share, the share is
checked for availability. If the storage is gone, it will be removed
automatically.

Also, getDirectoryContent() will now skip unavailable storages.

Cross-storage rename would cause copy + unlink. That unlink operation
must not trigger the trashbin.