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import os
def _calculate_csp_value(policy, resource_origin):
if policy == "absent":
return None
elif policy == "allowed":
return "script-src 'self' 'unsafe-inline' {}".format(resource_origin)
elif policy == "disallowed":
return "script-src 'self' 'unsafe-inline'"
else:
return None
def handle_headers(frame, request, response):
resource_origin = request.GET.first(b"resource-origin").decode()
# Send a 103 response.
resource_url = request.GET.first(b"resource-url").decode()
link_header_value = "<{}>; rel=preload; as=script".format(resource_url)
early_hints = [
(b":status", b"103"),
(b"link", link_header_value),
]
early_hints_csp = _calculate_csp_value(
request.GET.first(b"early-hints-policy").decode(), resource_origin)
if early_hints_csp:
early_hints.append((b"content-security-policy", early_hints_csp))
response.writer.write_raw_header_frame(headers=early_hints,
end_headers=True)
# Send the final response header.
response.status = 200
response.headers["content-type"] = "text/html"
final_csp = _calculate_csp_value(
request.GET.first(b"final-policy").decode(), resource_origin)
if final_csp:
response.headers["content-security-policy"] = final_csp
response.write_status_headers()
def main(request, response):
current_dir = os.path.dirname(os.path.realpath(__file__))
file_path = os.path.join(current_dir, "csp-basic.html")
with open(file_path, "r") as f:
test_content = f.read()
response.writer.write_data(item=test_content, last=True)