ganeti_web/middleware.py

   1 # Copyright (c) 2012 Oregon State University
   2 # See license and copying files for copyright information.
   3
   4 # This module provides middleware which Django is too wimpy to provide itself.
   5
   6 from django.core.exceptions import PermissionDenied
   7 from django.http import HttpResponseForbidden
   8 from django.template import RequestContext, loader
   9
  10 def render_403(request, message):
  11     """
  12     Render a 403 response.
  13     """
  14     template = loader.get_template('403.html')
  15     context = RequestContext(request, {
  16         'message': message,
  17     })
  18
  19     return HttpResponseForbidden(template.render(context))
  20
  21
  22 class PermissionDeniedMiddleware(object):
  23     """
  24     Middleware which intercepts ``PermissionDenied`` exceptions and returns 403
  25     responses.
  26     """
  27
  28     def process_exception(self, request, e):
  29         if isinstance(e, PermissionDenied):
  30             return render_403(request, ", ".join(e.args))