django/utils/decorators.py

   1 "Functions that help with dynamically creating decorators for views."
   2
   3 def decorator_from_middleware(middleware_class):
   4     """
   5     Given a middleware class (not an instance), returns a view decorator. This
   6     lets you use middleware functionality on a per-view basis.
   7     """
   8     def _decorator_from_middleware(view_func, *args, **kwargs):
   9         middleware = middleware_class(*args, **kwargs)
  10         def _wrapped_view(request, *args, **kwargs):
  11             if hasattr(middleware, 'process_request'):
  12                 result = middleware.process_request(request)
  13                 if result is not None:
  14                     return result
  15             if hasattr(middleware, 'process_view'):
  16                 result = middleware.process_view(request, view_func, *args, **kwargs)
  17                 if result is not None:
  18                     return result
  19             try:
  20                 response = view_func(request, *args, **kwargs)
  21             except Exception, e:
  22                 if hasattr(middleware, 'process_exception'):
  23                     result = middleware.process_exception(request, e)
  24                     if result is not None:
  25                         return result
  26                 raise
  27             if hasattr(middleware, 'process_response'):
  28                 result = middleware.process_response(request, response)
  29                 if result is not None:
  30                     return result
  31             return response
  32         return _wrapped_view
  33     return _decorator_from_middleware