text: # -*- coding: utf-8 -*-
  # Copyright 2015, 2016 OpenMarket Ltd
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from twisted.internet import defer
  
  from synapse.api.errors import AuthError, SynapseError, StoreError, Codes
  from synapse.http.servlet import RestServlet, parse_json_object_from_request
  from synapse.types import UserID
  
  from ._base import client_v2_patterns
  from ._base import set_timeline_upper_limit
  
  import logging
  
  
  logger = logging.getLogger(__name__)
  
  
  class GetFilterRestServlet(RestServlet):
      PATTERNS = client_v2_patterns("/user/(?P<user_id>[^/]*)/filter/(?P<filter_id>[^/]*)")
  
      def __init__(self, hs):
          super(GetFilterRestServlet, self).__init__()
          self.hs = hs
          self.auth = hs.get_auth()
          self.filtering = hs.get_filtering()
  
      @defer.inlineCallbacks
      def on_GET(self, request, user_id, filter_id):
          target_user = UserID.from_string(user_id)
          requester = yield self.auth.get_user_by_req(request)
  
          if target_user != requester.user:
              raise AuthError(403, "Cannot get filters for other users")
  
          if not self.hs.is_mine(target_user):
              raise AuthError(403, "Can only get filters for local users")
  
          try:
              filter_id = int(filter_id)
          except:
              raise SynapseError(400, "Invalid filter_id")
  
          try:
              filter = yield self.filtering.get_user_filter(
                  user_localpart=target_user.localpart,
                  filter_id=filter_id,
              )
  
              defer.returnValue((200, filter.get_filter_json()))
          except (KeyError, StoreError):
              raise SynapseError(400, "No such filter", errcode=Codes.NOT_FOUND)
  
  
  class CreateFilterRestServlet(RestServlet):
      PATTERNS = client_v2_patterns("/user/(?P<user_id>[^/]*)/filter")
  
      def __init__(self, hs):
          super(CreateFilterRestServlet, self).__init__()
          self.hs = hs
          self.auth = hs.get_auth()
          self.filtering = hs.get_filtering()
  
      @defer.inlineCallbacks
      def on_POST(self, request, user_id):
  
          target_user = UserID.from_string(user_id)
          requester = yield self.auth.get_user_by_req(request)
  
          if target_user != requester.user:
              raise AuthError(403, "Cannot create filters for other users")
  
          if not self.hs.is_mine(target_user):
              raise AuthError(403, "Can only create filters for local users")
  
          content = parse_json_object_from_request(request)
          set_timeline_upper_limit(
              content,
              self.hs.config.filter_timeline_limit
          )
  
          filter_id = yield self.filtering.add_user_filter(
              user_localpart=target_user.localpart,
              user_filter=content,
          )
  
          defer.returnValue((200, {"filter_id": str(filter_id)}))
  
  
  def register_servlets(hs, http_server):
      GetFilterRestServlet(hs).register(http_server)
      CreateFilterRestServlet(hs).register(http_server)
  