"""

Decorators for views based on HTTP headers.

"""

try:

    from functools import wraps

except ImportError:

    from django.utils.functional import wraps  # Python 2.3, 2.4 fallback.

from django.utils.decorators import decorator_from_middleware

from django.middleware.http import ConditionalGetMiddleware

from django.http import HttpResponseNotAllowed

conditional_page = decorator_from_middleware(ConditionalGetMiddleware)

def require_http_methods(request_method_list):

    """

    Decorator to make a view only accept particular request methods.  Usage::

        @require_http_methods(["GET", "POST"])

        def my_view(request):

            # I can assume now that only GET or POST requests make it this far

            # ...

    Note that request methods should be in uppercase.

    """

    def decorator(func):

        def inner(request, *args, **kwargs):

            if request.method not in request_method_list:

                return HttpResponseNotAllowed(request_method_list)

            return func(request, *args, **kwargs)

        return wraps(func)(inner)

    return decorator

require_GET = require_http_methods(["GET"])

require_GET.__doc__ = "Decorator to require that a view only accept the GET method."

require_POST = require_http_methods(["POST"])

require_POST.__doc__ = "Decorator to require that a view only accept the POST method."