author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 15 Nov 2008 16:17:11 +0000 | |
changeset 482 | 839740b061ad |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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import re |
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|
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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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from django.utils.http import urlquote |
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from django.core import urlresolvers |
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from django.utils.hashcompat import md5_constructor |
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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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|
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- Forbids access to User-Agents in settings.DISALLOWED_USER_AGENTS |
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|
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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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|
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- If APPEND_SLASH is set and the initial URL doesn't end with a |
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slash, and it is not found in urlpatterns, a new URL is formed by |
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appending a slash at the end. If this new URL is found in |
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urlpatterns, then an HTTP-redirect is returned to this new URL; |
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otherwise the initial URL is processed as usual. |
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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 |
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# 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 |
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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 and there is no pattern for the current path |
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if settings.APPEND_SLASH and (not old_url[1].endswith('/')): |
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if (not _is_valid_path(request.path_info) and |
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_is_valid_path("%s/" % request.path_info)): |
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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, ("" |
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"You called this URL via POST, but the URL doesn't end " |
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"in a slash and you have APPEND_SLASH set. Django can't " |
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"redirect to the slash URL while maintaining POST data. " |
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"Change your form to point to %s%s (note the trailing " |
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"slash), or set APPEND_SLASH=False in your Django " |
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"settings.") % (new_url[0], new_url[1]) |
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if new_url == old_url: |
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# No redirects required. |
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return |
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if new_url[0]: |
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newurl = "%s://%s%s" % ( |
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request.is_secure() and 'https' or 'http', |
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new_url[0], urlquote(new_url[1])) |
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else: |
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newurl = urlquote(new_url[1]) |
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if request.GET: |
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newurl += '?' + request.META['QUERY_STRING'] |
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return http.HttpResponsePermanentRedirect(newurl) |
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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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98 |
|
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# Use ETags, if requested. |
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if settings.USE_ETAGS: |
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101 |
if response.has_header('ETag'): |
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102 |
etag = response['ETag'] |
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103 |
else: |
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etag = '"%s"' % md5_constructor(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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106 |
cookies = response.cookies |
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107 |
response = http.HttpResponseNotModified() |
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108 |
response.cookies = cookies |
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else: |
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response['ETag'] = etag |
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111 |
|
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return response |
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def _is_ignorable_404(uri): |
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""" |
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Returns True if a 404 at the given URL *shouldn't* notify the site managers. |
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""" |
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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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125 |
|
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def _is_internal_request(domain, referer): |
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127 |
""" |
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Returns true if the referring URL is the same domain as the current request. |
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129 |
""" |
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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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|
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def _is_valid_path(path): |
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134 |
""" |
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Returns True if the given path resolves against the default URL resolver, |
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False otherwise. |
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137 |
|
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This is a convenience method to make working with "is this a match?" cases |
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easier, avoiding unnecessarily indented try...except blocks. |
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140 |
""" |
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try: |
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urlresolvers.resolve(path) |
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return True |
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except urlresolvers.Resolver404: |
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return False |
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146 |