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.http import HttpResponseForbidden
   7 from django.template import RequestContext, loader
   8
   9
  10 class Http403(Exception):
  11     """
  12     A 403 error should be sent back to our client.
  13     """
  14
  15
  16 def render_403(request, message):
  17     """
  18     Render a 403 response.
  19     """
  20
  21     template = loader.get_template('403.html')
  22     context = RequestContext(request, {
  23         'message': message,
  24     })
  25
  26     return HttpResponseForbidden(template.render(context))
  27
  28
  29 class Http403Middleware(object):
  30     """
  31     Middleware which intercepts ``Http403`` exceptions and returns 403
  32     responses.
  33     """
  34
  35     def process_exception(self, request, e):
  36         if isinstance(e, Http403):
  37             return render_403(request, ", ".join(e.args))