json_callback.py

def json_callback(view_func):
  """if the GET parameter callback is set, wrap response in a function with that name"""
  def _decorator(request, *args, **kwargs):
    try:
      # check for callback, if it's there, modify the return
      callback = request.GET.__getitem__('callback')
      response = view_func(request, *args, **kwargs)
      response.content = callback + '(%s);' % response.content
      return response
    except KeyError, e:
      # callback not found, just return the original function
      return view_func(request, *args, **kwargs)
  return _decorator