+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
class Arvados::V1::LinksController < ApplicationController
- def index
- if params[:tail_uuid]
- params[:where] = Oj.load(params[:where]) if params[:where].is_a?(String)
- params[:where] ||= {}
- params[:where][:tail_uuid] = params[:tail_uuid]
+
+ def check_uuid_kind uuid, kind
+ if kind and ArvadosModel::resource_class_for_uuid(uuid).andand.kind != kind
+ send_error("'#{kind}' does not match uuid '#{uuid}', expected '#{ArvadosModel::resource_class_for_uuid(uuid).andand.kind}'",
+ status: 422)
+ nil
+ else
+ true
end
+ end
+
+ def create
+ return if ! check_uuid_kind resource_attrs[:head_uuid], resource_attrs[:head_kind]
+ return if ! check_uuid_kind resource_attrs[:tail_uuid], resource_attrs[:tail_kind]
+
+ resource_attrs.delete :head_kind
+ resource_attrs.delete :tail_kind
super
end
+
+ def get_permissions
+ if current_user.andand.can?(manage: @object)
+ # find all links and return them
+ @objects = Link.unscoped.where(link_class: "permission",
+ head_uuid: params[:uuid])
+ @offset = 0
+ @limit = @objects.count
+ render_list
+ else
+ render :json => { errors: ['Forbidden'] }.to_json, status: 403
+ end
+ end
+
+ protected
+
+ def find_object_by_uuid
+ if params[:id] && params[:id].match(/\D/)
+ params[:uuid] = params.delete :id
+ end
+ if action_name == 'get_permissions'
+ # get_permissions accepts a UUID for any kind of object.
+ @object = ArvadosModel::resource_class_for_uuid(params[:uuid])
+ .readable_by(*@read_users)
+ .where(uuid: params[:uuid])
+ .first
+ elsif !current_user
+ super
+ else
+ # The usual permission-filtering index query is unnecessarily
+ # inefficient, and doesn't match all permission links that
+ # should be visible (see #18865). Instead, we look up the link
+ # by UUID, then check whether (a) its tail_uuid is the current
+ # user or (b) its head_uuid is an object the current_user
+ # can_manage.
+ link = Link.unscoped.where(uuid: params[:uuid]).first
+ if link && link.link_class != 'permission'
+ # Not a permission link. Re-fetch using generic
+ # permission-filtering query.
+ super
+ elsif link && (current_user.uuid == link.tail_uuid ||
+ current_user.can?(manage: link.head_uuid))
+ # Permission granted.
+ @object = link
+ else
+ # Permission denied, i.e., link is invisible => 404.
+ @object = nil
+ end
+ end
+ end
+
+ # Overrides ApplicationController load_where_param
+ def load_where_param
+ super
+
+ # head_kind and tail_kind columns are now virtual,
+ # equivalent functionality is now provided by
+ # 'is_a', so fix up any old-style 'where' clauses.
+ if @where
+ @filters ||= []
+ if @where[:head_kind]
+ @filters << ['head_uuid', 'is_a', @where[:head_kind]]
+ @where.delete :head_kind
+ end
+ if @where[:tail_kind]
+ @filters << ['tail_uuid', 'is_a', @where[:tail_kind]]
+ @where.delete :tail_kind
+ end
+ end
+ end
+
+ # Overrides ApplicationController load_filters_param
+ def load_filters_param
+ super
+
+ # head_kind and tail_kind columns are now virtual,
+ # equivalent functionality is now provided by
+ # 'is_a', so fix up any old-style 'filter' clauses.
+ @filters = @filters.map do |k|
+ if k[0] == 'head_kind' and k[1] == '='
+ ['head_uuid', 'is_a', k[2]]
+ elsif k[0] == 'tail_kind' and k[1] == '='
+ ['tail_uuid', 'is_a', k[2]]
+ else
+ k
+ end
+ end
+
+ # If the provided filters are enough to limit the results to
+ # permission links with specific head_uuids or
+ # tail_uuid=current_user, bypass the normal readable_by query
+ # (which doesn't match all can_manage-able items, see #18865) --
+ # just ensure the current user actually has can_manage permission
+ # for the provided head_uuids, removing any that don't. At that
+ # point the caller's filters are an effective permission filter.
+ if @filters.include?(['link_class', '=', 'permission'])
+ @filters.map do |k|
+ if k[0] == 'tail_uuid' && k[1] == '=' && k[2] == current_user.uuid
+ @objects = Link.unscoped
+ elsif k[0] == 'head_uuid'
+ if k[1] == '=' && current_user.can?(manage: k[2])
+ @objects = Link.unscoped
+ elsif k[1] == 'in'
+ # Modify the filter operand element (k[2]) in place,
+ # removing any non-permitted UUIDs.
+ k[2].select! do |head_uuid|
+ current_user.can?(manage: head_uuid)
+ end
+ @objects = Link.unscoped
+ end
+ end
+ end
+ end
+ end
+
end
projects / arvados.git / blobdiff