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venv/Lib/site-packages/django/middleware/security.py

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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):
+        super().__init__(get_response)
+        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.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.referrer_policy = settings.SECURE_REFERRER_POLICY
+        self.cross_origin_opener_policy = settings.SECURE_CROSS_ORIGIN_OPENER_POLICY
+
+    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.headers['Strict-Transport-Security'] = sts_header
+
+        if self.content_type_nosniff:
+            response.headers.setdefault('X-Content-Type-Options', 'nosniff')
+
+        if self.referrer_policy:
+            # Support a comma-separated string or iterable of values to allow
+            # fallback.
+            response.headers.setdefault('Referrer-Policy', ','.join(
+                [v.strip() for v in self.referrer_policy.split(',')]
+                if isinstance(self.referrer_policy, str) else self.referrer_policy
+            ))
+
+        if self.cross_origin_opener_policy:
+            response.setdefault(
+                'Cross-Origin-Opener-Policy',
+                self.cross_origin_opener_policy,
+            )
+        return response