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import re
from django.conf import settings
from django.http import HttpResponsePermanentRedirect
from django.utils.deprecation import MiddlewareMixin
class SecurityMiddleware(MiddlewareMixin):
def __init__(self, get_response=None):
self.sts_seconds = settings.SECURE_HSTS_SECONDS
self.sts_include_subdomains = settings.SECURE_HSTS_INCLUDE_SUBDOMAINS
self.sts_preload = settings.SECURE_HSTS_PRELOAD
self.content_type_nosniff = settings.SECURE_CONTENT_TYPE_NOSNIFF
self.xss_filter = settings.SECURE_BROWSER_XSS_FILTER
self.redirect = settings.SECURE_SSL_REDIRECT
self.redirect_host = settings.SECURE_SSL_HOST
self.redirect_exempt = [re.compile(r) for r in settings.SECURE_REDIRECT_EXEMPT]
self.get_response = get_response
def process_request(self, request):
path = request.path.lstrip("/")
if (self.redirect and not request.is_secure() and
not any(pattern.search(path)
for pattern in self.redirect_exempt)):
host = self.redirect_host or request.get_host()
return HttpResponsePermanentRedirect(
"https://%s%s" % (host, request.get_full_path())
)
def process_response(self, request, response):
if (self.sts_seconds and request.is_secure() and
'Strict-Transport-Security' not in response):
sts_header = "max-age=%s" % self.sts_seconds
if self.sts_include_subdomains:
sts_header = sts_header + "; includeSubDomains"
if self.sts_preload:
sts_header = sts_header + "; preload"
response['Strict-Transport-Security'] = sts_header
if self.content_type_nosniff:
response.setdefault('X-Content-Type-Options', 'nosniff')
if self.xss_filter:
response.setdefault('X-XSS-Protection', '1; mode=block')
return response