module Permissionable
extend ActiveSupport::Concern
included do
has_many :permissions, :as => :item
after_create :add_permission, if: :create_permission?
end
def permissions_count
permissions.count
end
def highest_permission(user)
where_hash = {item_id: self.id, item_type: self.class.to_s}
team_permissions = user.team_permissions.where(where_hash)
user_permissions = user.permissions.where(where_hash)
(team_permissions + user_permissions).
sort(&:permissions_order).last
end
def permission?(role, user)
# Deny if user is nil
return false unless user
# Deny if user is of wrong type
raise ArgumentError, "no user given" unless user.is_a? User
# Allow any admin user.
return true if user.admin? rescue nil
# Retrieve direct user permissions.
@perms = self.permissions.subject(user).all
# Retrieve permissions through team.
user.teams.each do |team|
@perms << Permission.item(self).subject(team).all
end
# Deny if no permission is found.
return false unless @perms
# Allow if role matches any permission.
@perms.flatten.each do |perm|
# Requested role exists exactly as permission.
return true if perm.role == role.to_s
# editors have reader permissions.
return true if perm.role == 'editor' and role == :reader
# owners have reader and editor permissions.
return true if perm.role == 'owner' and role == :reader
return true if perm.role == 'owner' and role == :editor
end
# Deny otherwise.
false
end
protected
def create_permission?
respond_to?(:user) && user
end
def add_permission
permissions.where(subject_id: user, subject_type: user.class.to_s).
first_or_create!(subject: user, role: 'owner')
end
end