1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
from django.conf import settings
from django.utils.csp import CSP, LazyNonce, build_policy
from django.utils.deprecation import MiddlewareMixin
def get_nonce(request):
return getattr(request, "_csp_nonce", None)
class ContentSecurityPolicyMiddleware(MiddlewareMixin):
def process_request(self, request):
request._csp_nonce = LazyNonce()
def process_response(self, request, response):
nonce = get_nonce(request)
sentinel = object()
if (csp_config := getattr(response, "_csp_config", sentinel)) is sentinel:
csp_config = settings.SECURE_CSP
if (csp_ro_config := getattr(response, "_csp_ro_config", sentinel)) is sentinel:
csp_ro_config = settings.SECURE_CSP_REPORT_ONLY
for header, config in [
(CSP.HEADER_ENFORCE, csp_config),
(CSP.HEADER_REPORT_ONLY, csp_ro_config),
]:
# If headers are already set on the response, don't overwrite them.
# This allows for views to set their own CSP headers as needed.
# An empty config means CSP headers are not added to the response.
if config and header not in response:
response.headers[str(header)] = build_policy(config, nonce)
return response
|
