app/django/views/decorators/http.py
author Todd Larsen <tlarsen@google.com>
Fri, 18 Jul 2008 18:22:23 +0000
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Major reorganization of the soc svn repo, to merge into a single App Engine image (to make development easier, now that only a single app will run all Google Open Source programs).
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"""
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Decorators for views based on HTTP headers.
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"""
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try:
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    from functools import wraps
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except ImportError:
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    from django.utils.functional import wraps  # Python 2.3, 2.4 fallback.
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from django.utils.decorators import decorator_from_middleware
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from django.middleware.http import ConditionalGetMiddleware
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from django.http import HttpResponseNotAllowed
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conditional_page = decorator_from_middleware(ConditionalGetMiddleware)
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def require_http_methods(request_method_list):
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    """
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    Decorator to make a view only accept particular request methods.  Usage::
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        @require_http_methods(["GET", "POST"])
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        def my_view(request):
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            # I can assume now that only GET or POST requests make it this far
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            # ...
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    Note that request methods should be in uppercase.
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    """
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    def decorator(func):
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        def inner(request, *args, **kwargs):
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            if request.method not in request_method_list:
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                return HttpResponseNotAllowed(request_method_list)
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            return func(request, *args, **kwargs)
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        return wraps(func)(inner)
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    return decorator
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require_GET = require_http_methods(["GET"])
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require_GET.__doc__ = "Decorator to require that a view only accept the GET method."
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require_POST = require_http_methods(["POST"])
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require_POST.__doc__ = "Decorator to require that a view only accept the POST method."