feat: migrate to django-csp 4.0

Use constants from
django-csp-library directly.

Refs: PT-1961

Author: mhieta

notification_importers/admin.py

@@ -1,6 +1,7 @@
 import importlib
 import logging
 
+from csp.constants import UNSAFE_INLINE
 from csp.decorators import csp_update
 from django.conf import settings
 from django.contrib import admin, messages
@@ -11,8 +12,6 @@
 from django_ilmoitin.admin import NotificationTemplateAdmin
 from django_ilmoitin.models import NotificationTemplate
 
-from palvelutarjotin.consts import CSP
-
 from .notification_importer import (
     AbstractNotificationImporter,
     NotificationImporterException,
@@ -113,7 +112,10 @@ def _send_error_message(self, request, message):
     # Acecpt CSP_UNSAFE_INLINE for the changeform view to allow
     # the preview template to work correctly.
     @csp_update(
-        SCRIPT_SRC=settings.CSP_SCRIPT_SRC + [CSP.UNSAFE_INLINE],
+        {
+            "script-src": settings.CONTENT_SECURITY_POLICY["DIRECTIVES"]["script-src"]
+            + [UNSAFE_INLINE],
+        }
     )
     def changeform_view(self, request, object_id=None, form_url="", extra_context=None):
         return super().changeform_view(

palvelutarjotin/consts.py

@@ -25,16 +25,3 @@
 INVALID_TOKEN_ERROR = "INVALID_TOKEN_ERROR"
 INVALID_STUDY_GROUP_UNIT_INFO_ERROR = "INVALID_STUDY_GROUP_UNIT_INFO_ERROR"
 QUEUEING_NOT_ALLOWED_ERROR = "QUEUEING_NOT_ALLOWED_ERROR"
-
-
-class CSP:
-    """The “special” source values of 'self', 'unsafe-inline', 'unsafe-eval', 'none'
-    and hash-source ('sha256-...') must be quoted! e.g.: CSP_DEFAULT_SRC = ("'self'",).
-    Without quotes they will not work as intended.
-    Ref. https://django-csp.readthedocs.io/en/stable/configuration.html.
-    """
-
-    SELF = "'self'"
-    NONE = "'none'"
-    UNSAFE_INLINE = "'unsafe-inline'"
-    UNSAFE_EVAL = "'unsafe-eval'"

palvelutarjotin/settings.py

@@ -5,12 +5,12 @@
 
 import environ
 import sentry_sdk
+from csp.constants import SELF, UNSAFE_INLINE
 from django.core.exceptions import ImproperlyConfigured
 from django.utils.translation import gettext_lazy as _
 from sentry_sdk.integrations.django import DjangoIntegration
 
 from palvelutarjotin import __version__
-from palvelutarjotin.consts import CSP
 
 checkout_dir = environ.Path(__file__) - 2
 assert os.path.exists(checkout_dir("manage.py"))
@@ -269,32 +269,20 @@
 CORS_ALLOW_ALL_ORIGINS = env.bool("CORS_ALLOW_ALL_ORIGINS")
 
 # Configure the default CSP rule for different source types
-CSP_DEFAULT_SRC = [CSP.SELF]
-
-# CSP_STYLE_SRC includes 'unsafe-inline' for inline styles added by `django-helusers`.
-CSP_STYLE_SRC = [
-    CSP.SELF,
-    CSP.UNSAFE_INLINE,
-    "cdn.jsdelivr.net",
-    "blob:",
-]
-
-CSP_SCRIPT_SRC = [
-    CSP.SELF,
-    "cdn.jsdelivr.net",  # /graphql/ endpoint
-    "blob:",
-]
-
-CSP_FONT_SRC = [
-    CSP.SELF,
-    "data:",  # /graphql/ endpoint uses "data:font/woff2"
-]
-
-CSP_IMG_SRC = [
-    CSP.SELF,
-    "blob:",
-    "data:",
-]
+CONTENT_SECURITY_POLICY = {
+    "DIRECTIVES": {
+        "default-src": [SELF],
+        "font-src": [SELF, "data:"],  # /graphql/ endpoint uses "data:font/woff2"
+        "img-src": [SELF, "blob:", "data:"],
+        "script-src": [SELF, "cdn.jsdelivr.net", "blob:"],  # /graphql/ endpoint
+        "style-src": [
+            SELF,
+            UNSAFE_INLINE,
+            "cdn.jsdelivr.net",
+            "blob:",
+        ],  # 'unsafe-inline' needed for `django-helusers`.
+    }
+}
 
 AUTHENTICATION_BACKENDS = [
     "axes.backends.AxesBackend",

palvelutarjotin/urls.py

@@ -1,3 +1,4 @@
+from csp.constants import UNSAFE_INLINE
 from csp.decorators import csp_update
 from django.conf import settings
 from django.conf.urls.static import static
@@ -15,7 +16,6 @@
 from common.utils import get_api_version
 from custom_health_checks.views import HealthCheckJSONView
 from palvelutarjotin import __version__
-from palvelutarjotin.consts import CSP
 from palvelutarjotin.views import SentryGraphQLView
 
 admin.site.index_title = " ".join([gettext("Kultus API"), get_api_version()])
@@ -25,8 +25,10 @@
 
 # Add unsafe-inline to enable GraphiQL interface at /graphql/
 @csp_update(
-    SCRIPT_SRC=settings.CSP_SCRIPT_SRC
-    + ([CSP.UNSAFE_INLINE] if IS_GRAPHIQL_ENABLED else [])
+    {
+        "script-src": settings.CONTENT_SECURITY_POLICY["DIRECTIVES"]["script-src"]
+        + ([UNSAFE_INLINE] if IS_GRAPHIQL_ENABLED else []),
+    }
 )
 @csrf_exempt
 def graphql_view(request, *args, **kwargs):