text: #!/usr/bin/python
  '''
  Author: Albert Monfa
  
  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 aiohttp.web    import  Response
  from aiohttp.web    import  middleware
  from aiohttp.web    import  HTTPException, HTTPNotFound
  
  class Authentication(object):
  
      @middleware
      async def hook(request, handler):
  
          # TODO
          # Implement something BEFORE executing the Handler
  
          try:
              response = await handler(request)
  
              # TODO
              # Implement something BEFORE executing the Handler
  
              return response
          except HTTPNotFound as ex:
              print(ex.reason)
              response = Response(
                  status=404,
              )
              return response
          except HTTPException as ex:
              response = Response(
                  status=501,
                  reason='Not Implemented',
              )
              return response