Until now file rooms were available only to users with direct access to
the file. Now file rooms are available to any user or guest too if the
link is publicly shared (with a link share, for example).
Public shares are identified by a share token instead of a file id, so a
new endpoint, which is a counterpart of FilesController but for share
tokens, was added. The file room, however, is still associated to the
file id like before.
When checking if a participant can join a room if the current user is a
user without direct access to the file or a guest it is not even
possible to know if the file id belongs to a publicly shared file. Due
to this when the room is got for a share token the share token is stored
in the session and then used in following requests when checking whether
the participant can join a room or not.
Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
