mirror of
https://github.com/django/django.git
synced 2024-12-23 01:25:58 +00:00
175 lines
7.2 KiB
Python
175 lines
7.2 KiB
Python
import re
|
|
from urllib.parse import urlparse
|
|
|
|
from django.conf import settings
|
|
from django.core.exceptions import PermissionDenied
|
|
from django.core.mail import mail_managers
|
|
from django.http import HttpResponsePermanentRedirect
|
|
from django.urls import is_valid_path
|
|
from django.utils.deprecation import MiddlewareMixin
|
|
from django.utils.http import escape_leading_slashes
|
|
|
|
|
|
class CommonMiddleware(MiddlewareMixin):
|
|
"""
|
|
"Common" middleware for taking care of some basic operations:
|
|
|
|
- Forbid access to User-Agents in settings.DISALLOWED_USER_AGENTS
|
|
|
|
- URL rewriting: Based on the APPEND_SLASH and PREPEND_WWW settings,
|
|
append 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, form a new URL by
|
|
appending a slash at the end. If this new URL is found in
|
|
urlpatterns, return an HTTP redirect to this new URL; otherwise
|
|
process the initial URL as usual.
|
|
|
|
This behavior can be customized by subclassing CommonMiddleware and
|
|
overriding the response_redirect_class attribute.
|
|
"""
|
|
|
|
response_redirect_class = 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
|
|
user_agent = request.META.get('HTTP_USER_AGENT')
|
|
if user_agent is not None:
|
|
for user_agent_regex in settings.DISALLOWED_USER_AGENTS:
|
|
if user_agent_regex.search(user_agent):
|
|
raise PermissionDenied('Forbidden user agent')
|
|
|
|
# Check for a redirect based on settings.PREPEND_WWW
|
|
host = request.get_host()
|
|
must_prepend = settings.PREPEND_WWW and host and not host.startswith('www.')
|
|
redirect_url = ('%s://www.%s' % (request.scheme, host)) if must_prepend else ''
|
|
|
|
# Check if a slash should be appended
|
|
if self.should_redirect_with_slash(request):
|
|
path = self.get_full_path_with_slash(request)
|
|
else:
|
|
path = request.get_full_path()
|
|
|
|
# Return a redirect if necessary
|
|
if redirect_url or path != request.get_full_path():
|
|
redirect_url += path
|
|
return self.response_redirect_class(redirect_url)
|
|
|
|
def should_redirect_with_slash(self, request):
|
|
"""
|
|
Return True if settings.APPEND_SLASH is True and appending a slash to
|
|
the request path turns an invalid path into a valid one.
|
|
"""
|
|
if settings.APPEND_SLASH and not request.path_info.endswith('/'):
|
|
urlconf = getattr(request, 'urlconf', None)
|
|
return (
|
|
not is_valid_path(request.path_info, urlconf) and
|
|
is_valid_path('%s/' % request.path_info, urlconf)
|
|
)
|
|
return False
|
|
|
|
def get_full_path_with_slash(self, request):
|
|
"""
|
|
Return the full path of the request with a trailing slash appended.
|
|
|
|
Raise a RuntimeError if settings.DEBUG is True and request.method is
|
|
POST, PUT, or PATCH.
|
|
"""
|
|
new_path = request.get_full_path(force_append_slash=True)
|
|
# Prevent construction of scheme relative urls.
|
|
new_path = escape_leading_slashes(new_path)
|
|
if settings.DEBUG and request.method in ('POST', 'PUT', 'PATCH'):
|
|
raise RuntimeError(
|
|
"You called this URL via %(method)s, 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 %(method)s data. "
|
|
"Change your form to point to %(url)s (note the trailing "
|
|
"slash), or set APPEND_SLASH=False in your Django settings." % {
|
|
'method': request.method,
|
|
'url': request.get_host() + new_path,
|
|
}
|
|
)
|
|
return new_path
|
|
|
|
def process_response(self, request, response):
|
|
"""
|
|
When the status code of the response is 404, it may redirect to a path
|
|
with an appended slash if should_redirect_with_slash() returns True.
|
|
"""
|
|
# If the given URL is "Not Found", then check if we should redirect to
|
|
# a path with a slash appended.
|
|
if response.status_code == 404:
|
|
if self.should_redirect_with_slash(request):
|
|
return self.response_redirect_class(self.get_full_path_with_slash(request))
|
|
|
|
# Add the Content-Length header to non-streaming responses if not
|
|
# already set.
|
|
if not response.streaming and not response.has_header('Content-Length'):
|
|
response['Content-Length'] = str(len(response.content))
|
|
|
|
return response
|
|
|
|
|
|
class BrokenLinkEmailsMiddleware(MiddlewareMixin):
|
|
|
|
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 = request.META.get('HTTP_REFERER', '')
|
|
|
|
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):
|
|
"""
|
|
Return 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):
|
|
"""
|
|
Return True if the given request *shouldn't* notify the site managers
|
|
according to project settings or in situations outlined by the inline
|
|
comments.
|
|
"""
|
|
# The referer is empty.
|
|
if not referer:
|
|
return True
|
|
|
|
# APPEND_SLASH is enabled and the referer is equal to the current URL
|
|
# without a trailing slash indicating an internal redirect.
|
|
if settings.APPEND_SLASH and uri.endswith('/') and referer == uri[:-1]:
|
|
return True
|
|
|
|
# A '?' in referer is identified as a search engine source.
|
|
if not self.is_internal_request(domain, referer) and '?' in referer:
|
|
return True
|
|
|
|
# The referer is equal to the current URL, ignoring the scheme (assumed
|
|
# to be a poorly implemented bot).
|
|
parsed_referer = urlparse(referer)
|
|
if parsed_referer.netloc in ['', domain] and parsed_referer.path == uri:
|
|
return True
|
|
|
|
return any(pattern.search(uri) for pattern in settings.IGNORABLE_404_URLS)
|