account_picture_uncached.py

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import importlib

from base64 import decodebytes

keys = importlib.import_module("fedcm.support.keys")

error_checker = importlib.import_module("fedcm.support.request-params-check")

def main(request, response):

  request_error = error_checker.pictureCheck(request)

  if request_error:

   return request_error

  counter = request.server.stash.take(keys.ACCOUNT_PICTURE_UNCACHED_COUNTER_KEY)

  try:

    counter = int(counter) + 1

  except (TypeError, ValueError):

    counter = 1

  request.server.stash.put(keys.ACCOUNT_PICTURE_UNCACHED_COUNTER_KEY, str(counter).encode())

  response.headers.set(b"Content-Type", b"image/png")

  response.headers.set(b"Cache-Control", b"max-age=0")

  # Return minimum valid PNG

  png_response = decodebytes(b'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAAAAAA6fptVAAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg==')

  return png_response