-
- def invalidate_permissions_cache
- Rails.cache.delete_matched(/^groups_for_user_/)
- end
-
- def groups_i_can(verb)
- current_group_permissions.select { |uuid, mask| mask[verb] }.keys
- end
-
- def current_group_permissions
- return {} unless current_user
- Rails.cache.fetch "groups_for_user_#{current_user.uuid}" do
- permissions_from = {}
- todo = {current_user.uuid => true}
- done = {}
- while !todo.empty?
- lookup_uuids = todo.keys
- lookup_uuids.each do |uuid| done[uuid] = true end
- todo = {}
- Link.where('tail_uuid in (?) and link_class = ? and head_kind = ?',
- lookup_uuids,
- 'permission',
- 'orvos#group').each do |link|
- unless done.has_key? link.head_uuid
- todo[link.head_uuid] = true
- end
- link_permissions = {}
- case link.name
- when 'can_read'
- link_permissions = {read:true}
- when 'can_write'
- link_permissions = {read:true,write:true}
- when 'can_manage'
- link_permissions = ALL_PERMISSIONS
- end
- permissions_from[link.tail_uuid] ||= {}
- permissions_from[link.tail_uuid][link.head_uuid] ||= {}
- link_permissions.each do |k,v|
- permissions_from[link.tail_uuid][link.head_uuid][k] ||= v
- end
- end
- end
- search_permissions(current_user.uuid, permissions_from)
- end
- end
-
- protected
-
- def search_permissions(start, graph, merged={}, upstream_mask=nil, upstream_path={})
- nextpaths = graph[start]
- return merged if !nextpaths
- return merged if upstream_path.has_key? start
- upstream_path[start] = true
- upstream_mask ||= ALL_PERMISSIONS
- nextpaths.each do |head, mask|
- merged[head] ||= {}
- mask.each do |k,v|
- merged[head][k] ||= v if upstream_mask[k]
- end
- search_permissions(head, graph, merged, upstream_mask.select { |k,v| v && merged[head][k] }, upstream_path)
- end
- upstream_path.delete start
- merged
- end
-