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from __future__ import annotations
from django.conf import settings
from django.test.utils import override_settings
from html5lib.constants import E
from html5lib.html5parser import HTMLParser
from debug_toolbar.store import get_store
from debug_toolbar.toolbar import DebugToolbar
from .base import IntegrationTestCase
MIDDLEWARE_CSP_BEFORE = settings.MIDDLEWARE.copy()
MIDDLEWARE_CSP_BEFORE.insert(
MIDDLEWARE_CSP_BEFORE.index("debug_toolbar.middleware.DebugToolbarMiddleware"),
"csp.middleware.CSPMiddleware",
)
MIDDLEWARE_CSP_LAST = settings.MIDDLEWARE + ["csp.middleware.CSPMiddleware"]
def get_namespaces(element):
"""
Return the default `xmlns`. See
https://docs.python.org/3/library/xml.etree.elementtree.html#parsing-xml-with-namespaces
"""
if not element.tag.startswith("{"):
return {}
return {"": element.tag[1:].split("}", maxsplit=1)[0]}
@override_settings(DEBUG=True)
class CspRenderingTestCase(IntegrationTestCase):
"""Testing if `csp-nonce` renders."""
def setUp(self):
super().setUp()
self.parser = HTMLParser()
def _fail_if_missing(self, root, path, namespaces, nonce):
"""
Search elements, fail if a `nonce` attribute is missing on them.
"""
elements = root.findall(path=path, namespaces=namespaces)
for item in elements:
if item.attrib.get("nonce") != nonce:
raise self.failureException(f"{item} has no nonce attribute.")
def _fail_if_found(self, root, path, namespaces):
"""
Search elements, fail if a `nonce` attribute is found on them.
"""
elements = root.findall(path=path, namespaces=namespaces)
for item in elements:
if "nonce" in item.attrib:
raise self.failureException(f"{item} has a nonce attribute.")
def _fail_on_invalid_html(self, content, parser):
"""Fail if the passed HTML is invalid."""
if parser.errors:
default_msg = ["Content is invalid HTML:"]
lines = content.split(b"\n")
for position, error_code, data_vars in parser.errors:
default_msg.append(f" {E[error_code]}" % data_vars)
default_msg.append(f" {lines[position[0] - 1]!r}")
msg = self._formatMessage(None, "\n".join(default_msg))
raise self.failureException(msg)
def test_exists(self):
"""A `nonce` should exist when using the `CSPMiddleware`."""
for middleware in [MIDDLEWARE_CSP_BEFORE, MIDDLEWARE_CSP_LAST]:
with self.settings(MIDDLEWARE=middleware):
response = self.client.get(path="/csp_view/")
self.assertEqual(response.status_code, 200)
html_root = self.parser.parse(stream=response.content)
self._fail_on_invalid_html(content=response.content, parser=self.parser)
self.assertContains(response, "djDebug")
namespaces = get_namespaces(element=html_root)
nonce = response.context["request"].csp_nonce
self._fail_if_missing(
root=html_root, path=".//link", namespaces=namespaces, nonce=nonce
)
self._fail_if_missing(
root=html_root, path=".//script", namespaces=namespaces, nonce=nonce
)
# def test_does_not_exist_nonce_wasnt_used(self):
# """
# A `nonce` should not exist even when using the `CSPMiddleware`
# if the view didn't access the request.csp_nonce attribute.
# """
# for middleware in [MIDDLEWARE_CSP_BEFORE, MIDDLEWARE_CSP_LAST]:
# with self.settings(MIDDLEWARE=middleware):
# response = self.client.get(path="/regular/basic/")
# self.assertEqual(response.status_code, 200)
# html_root = self.parser.parse(stream=response.content)
# self._fail_on_invalid_html(content=response.content, parser=self.parser)
# self.assertContains(response, "djDebug")
# namespaces = get_namespaces(element=html_root)
# self._fail_if_found(
# root=html_root, path=".//link", namespaces=namespaces
# )
# self._fail_if_found(
# root=html_root, path=".//script", namespaces=namespaces
# )
@override_settings(
DEBUG_TOOLBAR_CONFIG={"DISABLE_PANELS": set()},
)
def test_redirects_exists(self):
for middleware in [MIDDLEWARE_CSP_BEFORE, MIDDLEWARE_CSP_LAST]:
with self.settings(MIDDLEWARE=middleware):
response = self.client.get(path="/csp_view/")
self.assertEqual(response.status_code, 200)
html_root = self.parser.parse(stream=response.content)
self._fail_on_invalid_html(content=response.content, parser=self.parser)
self.assertContains(response, "djDebug")
namespaces = get_namespaces(element=html_root)
context = response.context
nonce = str(context["toolbar"].csp_nonce)
self._fail_if_missing(
root=html_root, path=".//link", namespaces=namespaces, nonce=nonce
)
self._fail_if_missing(
root=html_root, path=".//script", namespaces=namespaces, nonce=nonce
)
def test_panel_content_nonce_exists(self):
store = get_store()
for middleware in [MIDDLEWARE_CSP_BEFORE, MIDDLEWARE_CSP_LAST]:
with self.settings(MIDDLEWARE=middleware):
response = self.client.get(path="/csp_view/")
self.assertEqual(response.status_code, 200)
request_ids = list(store.request_ids())
toolbar = DebugToolbar.fetch(request_ids[-1])
panels_to_check = ["HistoryPanel", "TimerPanel"]
for panel in panels_to_check:
content = toolbar.get_panel_by_id(panel).content
html_root = self.parser.parse(stream=content)
namespaces = get_namespaces(element=html_root)
nonce = str(toolbar.csp_nonce)
self._fail_if_missing(
root=html_root,
path=".//link",
namespaces=namespaces,
nonce=nonce,
)
self._fail_if_missing(
root=html_root,
path=".//script",
namespaces=namespaces,
nonce=nonce,
)
def test_missing(self):
"""A `nonce` should not exist when not using the `CSPMiddleware`."""
response = self.client.get(path="/regular/basic/")
self.assertEqual(response.status_code, 200)
html_root = self.parser.parse(stream=response.content)
self._fail_on_invalid_html(content=response.content, parser=self.parser)
self.assertContains(response, "djDebug")
namespaces = get_namespaces(element=html_root)
self._fail_if_found(root=html_root, path=".//link", namespaces=namespaces)
self._fail_if_found(root=html_root, path=".//script", namespaces=namespaces)
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