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from django.utils.http import http_date
class ConditionalGetMiddleware(object):
"""
Handles conditional GET operations. If the response has a ETag or
Last-Modified header, and the request has If-None-Match or
If-Modified-Since, the response is replaced by an HttpNotModified.
Also sets the Date and Content-Length response-headers.
"""
def process_response(self, request, response):
response['Date'] = http_date()
if not response.has_header('Content-Length'):
response['Content-Length'] = str(len(response.content))
if response.has_header('ETag'):
if_none_match = request.META.get('HTTP_IF_NONE_MATCH', None)
if if_none_match == response['ETag']:
# Setting the status is enough here. The response handling path
# automatically removes content for this status code (in
# http.conditional_content_removal()).
response.status_code = 304
if response.has_header('Last-Modified'):
if_modified_since = request.META.get('HTTP_IF_MODIFIED_SINCE', None)
if if_modified_since == response['Last-Modified']:
# Setting the status code is enough here (same reasons as
# above).
response.status_code = 304
return response
class SetRemoteAddrFromForwardedFor(object):
"""
Middleware that sets REMOTE_ADDR based on HTTP_X_FORWARDED_FOR, if the
latter is set. This is useful if you're sitting behind a reverse proxy that
causes each request's REMOTE_ADDR to be set to 127.0.0.1.
Note that this does NOT validate HTTP_X_FORWARDED_FOR. If you're not behind
a reverse proxy that sets HTTP_X_FORWARDED_FOR automatically, do not use
this middleware. Anybody can spoof the value of HTTP_X_FORWARDED_FOR, and
because this sets REMOTE_ADDR based on HTTP_X_FORWARDED_FOR, that means
anybody can "fake" their IP address. Only use this when you can absolutely
trust the value of HTTP_X_FORWARDED_FOR.
"""
def process_request(self, request):
try:
real_ip = request.META['HTTP_X_FORWARDED_FOR']
except KeyError:
return None
else:
# HTTP_X_FORWARDED_FOR can be a comma-separated list of IPs. The
# client's IP will be the first one.
real_ip = real_ip.split(",")[0].strip()
request.META['REMOTE_ADDR'] = real_ip
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