173 lines
7.0 KiB
Python
173 lines
7.0 KiB
Python
import hashlib
|
|
import logging
|
|
import re
|
|
|
|
from django.conf import settings
|
|
from django.core.mail import mail_managers
|
|
from django.core import urlresolvers
|
|
from django import http
|
|
from django.utils.encoding import force_text
|
|
from django.utils.http import urlquote
|
|
from django.utils import six
|
|
|
|
|
|
logger = logging.getLogger('django.request')
|
|
|
|
|
|
class CommonMiddleware(object):
|
|
"""
|
|
"Common" middleware for taking care of some basic operations:
|
|
|
|
- Forbids access to User-Agents in settings.DISALLOWED_USER_AGENTS
|
|
|
|
- URL rewriting: Based on the APPEND_SLASH and PREPEND_WWW settings,
|
|
this middleware appends missing slashes and/or prepends missing
|
|
"www."s.
|
|
|
|
- If APPEND_SLASH is set and the initial URL doesn't end with a
|
|
slash, and it is not found in urlpatterns, a new URL is formed by
|
|
appending a slash at the end. If this new URL is found in
|
|
urlpatterns, then an HTTP-redirect is returned to this new URL;
|
|
otherwise the initial URL is processed as usual.
|
|
|
|
This behavior can be customized by subclassing CommonMiddleware and
|
|
overriding the response_redirect_class attribute.
|
|
|
|
- ETags: If the USE_ETAGS setting is set, ETags will be calculated from
|
|
the entire page content and Not Modified responses will be returned
|
|
appropriately.
|
|
"""
|
|
|
|
response_redirect_class = http.HttpResponsePermanentRedirect
|
|
|
|
def process_request(self, request):
|
|
"""
|
|
Check for denied User-Agents and rewrite the URL based on
|
|
settings.APPEND_SLASH and settings.PREPEND_WWW
|
|
"""
|
|
|
|
# Check for denied User-Agents
|
|
if 'HTTP_USER_AGENT' in request.META:
|
|
for user_agent_regex in settings.DISALLOWED_USER_AGENTS:
|
|
if user_agent_regex.search(request.META['HTTP_USER_AGENT']):
|
|
logger.warning('Forbidden (User agent): %s', request.path,
|
|
extra={
|
|
'status_code': 403,
|
|
'request': request
|
|
}
|
|
)
|
|
return http.HttpResponseForbidden('<h1>Forbidden</h1>')
|
|
|
|
# Check for a redirect based on settings.APPEND_SLASH
|
|
# and settings.PREPEND_WWW
|
|
host = request.get_host()
|
|
old_url = [host, request.path]
|
|
new_url = old_url[:]
|
|
|
|
if (settings.PREPEND_WWW and old_url[0] and
|
|
not old_url[0].startswith('www.')):
|
|
new_url[0] = 'www.' + old_url[0]
|
|
|
|
# Append a slash if APPEND_SLASH is set and the URL doesn't have a
|
|
# trailing slash and there is no pattern for the current path
|
|
if settings.APPEND_SLASH and (not old_url[1].endswith('/')):
|
|
urlconf = getattr(request, 'urlconf', None)
|
|
if (not urlresolvers.is_valid_path(request.path_info, urlconf) and
|
|
urlresolvers.is_valid_path("%s/" % request.path_info, urlconf)):
|
|
new_url[1] = new_url[1] + '/'
|
|
if settings.DEBUG and request.method == 'POST':
|
|
raise RuntimeError((""
|
|
"You called this URL via POST, but the URL doesn't end "
|
|
"in a slash and you have APPEND_SLASH set. Django can't "
|
|
"redirect to the slash URL while maintaining POST data. "
|
|
"Change your form to point to %s%s (note the trailing "
|
|
"slash), or set APPEND_SLASH=False in your Django "
|
|
"settings.") % (new_url[0], new_url[1]))
|
|
|
|
if new_url == old_url:
|
|
# No redirects required.
|
|
return
|
|
if new_url[0]:
|
|
newurl = "%s://%s%s" % (
|
|
request.scheme,
|
|
new_url[0], urlquote(new_url[1]))
|
|
else:
|
|
newurl = urlquote(new_url[1])
|
|
if request.META.get('QUERY_STRING', ''):
|
|
if six.PY3:
|
|
newurl += '?' + request.META['QUERY_STRING']
|
|
else:
|
|
# `query_string` is a bytestring. Appending it to the unicode
|
|
# string `newurl` will fail if it isn't ASCII-only. This isn't
|
|
# allowed; only broken software generates such query strings.
|
|
# Better drop the invalid query string than crash (#15152).
|
|
try:
|
|
newurl += '?' + request.META['QUERY_STRING'].decode()
|
|
except UnicodeDecodeError:
|
|
pass
|
|
return self.response_redirect_class(newurl)
|
|
|
|
def process_response(self, request, response):
|
|
"""
|
|
Calculate the ETag, if needed.
|
|
"""
|
|
if settings.USE_ETAGS:
|
|
if response.has_header('ETag'):
|
|
etag = response['ETag']
|
|
elif response.streaming:
|
|
etag = None
|
|
else:
|
|
etag = '"%s"' % hashlib.md5(response.content).hexdigest()
|
|
if etag is not None:
|
|
if (200 <= response.status_code < 300
|
|
and request.META.get('HTTP_IF_NONE_MATCH') == etag):
|
|
cookies = response.cookies
|
|
response = http.HttpResponseNotModified()
|
|
response.cookies = cookies
|
|
else:
|
|
response['ETag'] = etag
|
|
|
|
return response
|
|
|
|
|
|
class BrokenLinkEmailsMiddleware(object):
|
|
|
|
def process_response(self, request, response):
|
|
"""
|
|
Send broken link emails for relevant 404 NOT FOUND responses.
|
|
"""
|
|
if response.status_code == 404 and not settings.DEBUG:
|
|
domain = request.get_host()
|
|
path = request.get_full_path()
|
|
referer = force_text(request.META.get('HTTP_REFERER', ''), errors='replace')
|
|
|
|
if not self.is_ignorable_request(request, path, domain, referer):
|
|
ua = request.META.get('HTTP_USER_AGENT', '<none>')
|
|
ip = request.META.get('REMOTE_ADDR', '<none>')
|
|
mail_managers(
|
|
"Broken %slink on %s" % (
|
|
('INTERNAL ' if self.is_internal_request(domain, referer) else ''),
|
|
domain
|
|
),
|
|
"Referrer: %s\nRequested URL: %s\nUser agent: %s\n"
|
|
"IP address: %s\n" % (referer, path, ua, ip),
|
|
fail_silently=True)
|
|
return response
|
|
|
|
def is_internal_request(self, domain, referer):
|
|
"""
|
|
Returns True if the referring URL is the same domain as the current request.
|
|
"""
|
|
# Different subdomains are treated as different domains.
|
|
return bool(re.match("^https?://%s/" % re.escape(domain), referer))
|
|
|
|
def is_ignorable_request(self, request, uri, domain, referer):
|
|
"""
|
|
Returns True if the given request *shouldn't* notify the site managers.
|
|
"""
|
|
# '?' in referer is identified as search engine source
|
|
if (not referer or
|
|
(not self.is_internal_request(domain, referer) and '?' in referer)):
|
|
return True
|
|
return any(pattern.search(uri) for pattern in settings.IGNORABLE_404_URLS)
|