def __before__(self):

        c.admin_user = session.get('admin_user')

        c.admin_username = session.get('admin_username')

        super(PermissionsController, self).__before__()

        self.perms_choices = [('repository.none', _('None'),),

                              ('repository.read', _('Read'),),

                              ('repository.write', _('Write'),),

                              ('repository.admin', _('Admin'),)]

        self.register_choices = [

            ('hg.register.none', 'disabled'),

            ('hg.register.manual_activate',

                            _('allowed with manual account activation')),

            ('hg.register.auto_activate',

                            _('allowed with automatic account activation')), ]

        self.create_choices = [('hg.create.none', _('Disabled')),

                               ('hg.create.repository', _('Enabled'))]

    def index(self, format='html'):

        """GET /permissions: All items in the collection"""

        # url('permissions')

    def create(self):

        """POST /permissions: Create a new item"""

        # url('permissions')

    def new(self, format='html'):

        """GET /permissions/new: Form to create a new item"""

        # url('new_permission')

    def update(self, id):

        """PUT /permissions/id: Update an existing item"""

        # Forms posted to this method should contain a hidden field:

        #    <input type="hidden" name="_method" value="PUT" />

        # Or using helpers:

        #    h.form(url('permission', id=ID),

        #           method='put')

        # url('permission', id=ID)

        permission_model = PermissionModel()

        _form = DefaultPermissionsForm([x[0] for x in self.perms_choices],

                                       [x[0] for x in self.register_choices],

                                       [x[0] for x in self.create_choices])()

        try:

            form_result = _form.to_python(dict(request.POST))

            form_result.update({'perm_user_name':id})

            permission_model.update(form_result)

            h.flash(_('Default permissions updated succesfully'),

                    category='success')

        except formencode.Invalid, errors:

            c.perms_choices = self.perms_choices

            c.register_choices = self.register_choices

            c.create_choices = self.create_choices

            return htmlfill.render(

                render('admin/permissions/permissions.html'),

                defaults=errors.value,

                errors=errors.error_dict or {},

                prefix_error=False,

                encoding="UTF-8")

        except Exception:

            log.error(traceback.format_exc())

            h.flash(_('error occured during update of permissions'),

                    category='error')

        return redirect(url('edit_permission', id=id))

    def delete(self, id):

        """DELETE /permissions/id: Delete an existing item"""

        # Forms posted to this method should contain a hidden field:

        #    <input type="hidden" name="_method" value="DELETE" />

        # Or using helpers:

        #    h.form(url('permission', id=ID),

        #           method='delete')

        # url('permission', id=ID)

    def show(self, id, format='html'):

        """GET /permissions/id: Show a specific item"""

        # url('permission', id=ID)

    def edit(self, id, format='html'):

        """GET /permissions/id/edit: Form to edit an existing item"""

        #url('edit_permission', id=ID)

        c.perms_choices = self.perms_choices

        c.register_choices = self.register_choices

        c.create_choices = self.create_choices

        if id == 'default':

            defaults = {'_method':'put'}

                if p.permission.permission_name.startswith('repository.'):

                    defaults['default_perm'] = p.permission.permission_name

                if p.permission.permission_name.startswith('hg.register.'):

                    defaults['default_register'] = p.permission.permission_name

                if p.permission.permission_name.startswith('hg.create.'):

                    defaults['default_create'] = p.permission.permission_name

            return htmlfill.render(

                        render('admin/permissions/permissions.html'),

                        defaults=defaults,

                        encoding="UTF-8",

                        force_defaults=True,)

        else:

            return redirect(url('admin_home'))