SilverStripe\Assets\Storage\AssetContainer::grantFile
Ensures that access to the specified protected file is granted for the current user.
If this file is currently in protected mode, the asset store will ensure the returned asset for the duration of the current session / user. This will have no effect if the file is in published mode. This will not grant access to users other than the owner of the current session. Does not require a member to be logged in.
Signature
public function grantFile()