"""
Cache middleware. If enabled, each Django-powered page will be cached based on
URL. The canonical way to enable cache middleware is to set
``UpdateCacheMiddleware`` as your first piece of middleware, and
``FetchFromCacheMiddleware`` as the last::

    MIDDLEWARE_CLASSES = [
        'django.middleware.cache.UpdateCacheMiddleware',
        ...
        'django.middleware.cache.FetchFromCacheMiddleware'
    ]

This is counter-intuitive, but correct: ``UpdateCacheMiddleware`` needs to run
last during the response phase, which processes middleware bottom-up;
``FetchFromCacheMiddleware`` needs to run last during the request phase, which
processes middleware top-down.

The single-class ``CacheMiddleware`` can be used for some simple sites.
However, if any other piece of middleware needs to affect the cache key, you'll
need to use the two-part ``UpdateCacheMiddleware`` and
``FetchFromCacheMiddleware``. This'll most often happen when you're using
Django's ``LocaleMiddleware``.

More details about how the caching works:

* Only parameter-less GET or HEAD-requests with status code 200 are cached.

* The number of seconds each page is stored for is set by the "max-age" section
  of the response's "Cache-Control" header, falling back to the
  CACHE_MIDDLEWARE_SECONDS setting if the section was not found.

* If CACHE_MIDDLEWARE_ANONYMOUS_ONLY is set to True, only anonymous requests
  (i.e., those not made by a logged-in user) will be cached. This is a simple
  and effective way of avoiding the caching of the Django admin (and any other
  user-specific content).

* This middleware expects that a HEAD request is answered with a response
  exactly like the corresponding GET request.

* When a hit occurs, a shallow copy of the original response object is returned
  from process_request.

* Pages will be cached based on the contents of the request headers listed in
  the response's "Vary" header.

* This middleware also sets ETag, Last-Modified, Expires and Cache-Control
  headers on the response object.

"""

from django.conf import settings
from django.core.cache import cache
from django.utils.cache import get_cache_key, learn_cache_key, patch_response_headers, get_max_age, has_vary_header


class UpdateCacheMiddleware(object):
    """
    Response-phase cache middleware that updates the cache if the response is
    cacheable.

    Must be used as part of the two-part update/fetch cache middleware.
    UpdateCacheMiddleware must be the first piece of middleware in
    MIDDLEWARE_CLASSES so that it'll get called last during the response phase.
    """
    def __init__(self):
        self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
        self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
        self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)

    def _should_update_cache(self, request, response):
        if not hasattr(request, '_cache_update_cache') or not request._cache_update_cache:
            return False
        if self.cache_anonymous_only and has_vary_header(response, 'Cookie'):
            assert hasattr(request, 'user'), "The Django cache middleware with CACHE_MIDDLEWARE_ANONYMOUS_ONLY=True requires authentication middleware to be installed. Edit your MIDDLEWARE_CLASSES setting to insert 'django.contrib.auth.middleware.AuthenticationMiddleware' before the CacheMiddleware."
            if request.user.is_authenticated():
                # Don't cache user-variable requests from authenticated users.
                return False
        return True

    def process_response(self, request, response):
        """Sets the cache, if needed."""
        if not self._should_update_cache(request, response):
            # We don't need to update the cache, just return.
            return response
        if request.method != 'GET':
            # This is a stronger requirement than above. It is needed
            # because of interactions between this middleware and the
            # HTTPMiddleware, which throws the body of a HEAD-request
            # away before this middleware gets a chance to cache it.
            return response
        if not response.status_code == 200:
            return response
        # Try to get the timeout from the "max-age" section of the "Cache-
        # Control" header before reverting to using the default cache_timeout
        # length.
        timeout = get_max_age(response)
        if timeout == None:
            timeout = self.cache_timeout
        elif timeout == 0:
            # max-age was set to 0, don't bother caching.
            return response
        patch_response_headers(response, timeout)
        if timeout:
            cache_key = learn_cache_key(request, response, timeout, self.key_prefix)
            cache.set(cache_key, response, timeout)
        return response

class FetchFromCacheMiddleware(object):
    """
    Request-phase cache middleware that fetches a page from the cache.

    Must be used as part of the two-part update/fetch cache middleware.
    FetchFromCacheMiddleware must be the last piece of middleware in
    MIDDLEWARE_CLASSES so that it'll get called last during the request phase.
    """
    def __init__(self):
        self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
        self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
        self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)

    def process_request(self, request):
        """
        Checks whether the page is already cached and returns the cached
        version if available.
        """
        if not request.method in ('GET', 'HEAD') or request.GET:
            request._cache_update_cache = False
            return None # Don't bother checking the cache.

        cache_key = get_cache_key(request, self.key_prefix)
        if cache_key is None:
            request._cache_update_cache = True
            return None # No cache information available, need to rebuild.

        response = cache.get(cache_key, None)
        if response is None:
            request._cache_update_cache = True
            return None # No cache information available, need to rebuild.

        request._cache_update_cache = False
        return response

class CacheMiddleware(UpdateCacheMiddleware, FetchFromCacheMiddleware):
    """
    Cache middleware that provides basic behavior for many simple sites.

    Also used as the hook point for the cache decorator, which is generated
    using the decorator-from-middleware utility.
    """
    def __init__(self, cache_timeout=None, key_prefix=None, cache_anonymous_only=None):
        self.cache_timeout = cache_timeout
        if cache_timeout is None:
            self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
        self.key_prefix = key_prefix
        if key_prefix is None:
            self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
        if cache_anonymous_only is None:
            self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
        else:
            self.cache_anonymous_only = cache_anonymous_only
