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Even slightly more CSP refactoring

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This commit is contained in:
Raphael Michel
2017-03-07 22:30:15 +01:00
parent cbf735487f
commit 2302dbade6
2 changed files with 25 additions and 22 deletions
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45
src/pretix/base/middleware.py
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@@ -135,27 +135,30 @@ def get_language_from_request(request: HttpRequest) -> str:
)
def _parse_csp(header):
h = {}
for part in header.split(';'):
k, v = part.strip().split(' ', 1)
h[k.strip()] = v.split(' ')
return h
def _render_csp(h):
return "; ".join(k + ' ' + ' '.join(v) for k, v in h.items())
def _merge_csp(a, b):
for k, v in a.items():
if k in b:
a[k] += b[k]
for k, v in b.items():
if k not in a:
a[k] = b[k]
class SecurityMiddleware(MiddlewareMixin):
def _parse_csp(self, header):
h = {}
for part in header.split(';'):
k, v = part.strip().split(' ', 1)
h[k.strip()] = v.split(' ')
return h
def _render_csp(self, h):
return "; ".join(k + ' ' + ' '.join(v) for k, v in h.items())
def _merge_csp(self, a, b):
for k, v in a.items():
if k in b:
a[k] += b[k]
for k, v in b.items():
if k not in a:
a[k] = b[k]
def process_response(self, request, resp):
if settings.DEBUG and resp.status_code >= 400:
# Don't use CSP on debug error page as it breaks of Django's fancy error
@@ -180,7 +183,7 @@ class SecurityMiddleware(MiddlewareMixin):
'form-action': ["{dynamic}', 'https:"],
}
if 'Content-Security-Policy' in resp:
self._merge_csp(h, self._parse_csp(resp['Content-Security-Policy']))
_merge_csp(h, _parse_csp(resp['Content-Security-Policy']))
staticdomain = "'self'"
dynamicdomain = "'self'"
@@ -193,5 +196,5 @@ class SecurityMiddleware(MiddlewareMixin):
else:
staticdomain += " " + settings.SITE_URL
dynamicdomain += " " + settings.SITE_URL
resp['Content-Security-Policy'] = self._render_csp(h).format(static=staticdomain, dynamic=dynamicdomain)
resp['Content-Security-Policy'] = _render_csp(h).format(static=staticdomain, dynamic=dynamicdomain)
return resp