gistfile1.pyw

class ApiHandler(webapp.RequestHandler):

  def check_uploaded_picture(self):
    if not self.check_api_key():
        self.error_response(401, API_ERROR_UNAUTHORIZED)
        return False
    
    if not self.request.get('picture'):
        self.error_response(400, API_ERROR_MISSING)
        return False
    
    if not self.check_picture_type(self.request.POST['picture']):
        self.error_response(400, API_ERROR_INVALID)
        return False
        
    return True

  def check_picture_type(self, picture):
    return picture.type in ['image/jpeg', 'image/png', 'image/gif']