105 lines
4.8 KiB
Python
105 lines
4.8 KiB
Python
from django.conf import settings
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from django import http
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from django.core.mail import mail_managers
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import md5
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import re
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class CommonMiddleware(object):
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"""
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"Common" middleware for taking care of some basic operations:
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- Forbids access to User-Agents in settings.DISALLOWED_USER_AGENTS
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- URL rewriting: Based on the APPEND_SLASH and PREPEND_WWW settings,
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this middleware appends missing slashes and/or prepends missing
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"www."s.
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- ETags: If the USE_ETAGS setting is set, ETags will be calculated from
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the entire page content and Not Modified responses will be returned
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appropriately.
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"""
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def process_request(self, request):
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"""
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Check for denied User-Agents and rewrite the URL based on
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settings.APPEND_SLASH and settings.PREPEND_WWW
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"""
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# Check for denied User-Agents
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if 'HTTP_USER_AGENT' in request.META:
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for user_agent_regex in settings.DISALLOWED_USER_AGENTS:
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if user_agent_regex.search(request.META['HTTP_USER_AGENT']):
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return http.HttpResponseForbidden('<h1>Forbidden</h1>')
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# Check for a redirect based on settings.APPEND_SLASH and settings.PREPEND_WWW
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host = request.get_host()
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old_url = [host, request.path]
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new_url = old_url[:]
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if settings.PREPEND_WWW and old_url[0] and not old_url[0].startswith('www.'):
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new_url[0] = 'www.' + old_url[0]
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# Append a slash if append_slash is set and the URL doesn't have a
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# trailing slash or a file extension.
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if settings.APPEND_SLASH and (not old_url[1].endswith('/')) and ('.' not in old_url[1].split('/')[-1]):
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new_url[1] = new_url[1] + '/'
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if settings.DEBUG and request.method == 'POST':
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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])
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if new_url != old_url:
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# Redirect
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if new_url[0]:
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newurl = "%s://%s%s" % (request.is_secure() and 'https' or 'http', new_url[0], new_url[1])
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else:
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newurl = new_url[1]
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if request.GET:
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newurl += '?' + request.GET.urlencode()
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return http.HttpResponsePermanentRedirect(newurl)
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return None
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def process_response(self, request, response):
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"Check for a flat page (for 404s) and calculate the Etag, if needed."
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if response.status_code == 404:
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if settings.SEND_BROKEN_LINK_EMAILS:
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# If the referrer was from an internal link or a non-search-engine site,
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# send a note to the managers.
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domain = request.get_host()
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referer = request.META.get('HTTP_REFERER', None)
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is_internal = _is_internal_request(domain, referer)
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path = request.get_full_path()
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if referer and not _is_ignorable_404(path) and (is_internal or '?' not in referer):
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ua = request.META.get('HTTP_USER_AGENT', '<none>')
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ip = request.META.get('REMOTE_ADDR', '<none>')
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mail_managers("Broken %slink on %s" % ((is_internal and 'INTERNAL ' or ''), domain),
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"Referrer: %s\nRequested URL: %s\nUser agent: %s\nIP address: %s\n" \
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% (referer, request.get_full_path(), ua, ip))
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return response
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# Use ETags, if requested.
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if settings.USE_ETAGS:
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if response.has_header('ETag'):
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etag = response['ETag']
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else:
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etag = md5.new(response.content).hexdigest()
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if response.status_code >= 200 and response.status_code < 300 and request.META.get('HTTP_IF_NONE_MATCH') == etag:
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cookies = response.cookies
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response = http.HttpResponseNotModified()
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response.cookies = cookies
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else:
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response['ETag'] = etag
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return response
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def _is_ignorable_404(uri):
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"Returns True if a 404 at the given URL *shouldn't* notify the site managers"
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for start in settings.IGNORABLE_404_STARTS:
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if uri.startswith(start):
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return True
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for end in settings.IGNORABLE_404_ENDS:
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if uri.endswith(end):
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return True
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return False
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def _is_internal_request(domain, referer):
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"Return true if the referring URL is the same domain as the current request"
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# Different subdomains are treated as different domains.
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return referer is not None and re.match("^https?://%s/" % re.escape(domain), referer)
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