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# Returns a valid response when request's |referrer| matches
# |expected_referrer|.
def main(request, response):
# We want |referrer| to be the referrer header with no query params,
# because |expected_referrer| will not contain any query params, and
# thus cannot be compared with the actual referrer header if it were to
# contain query params. This works fine if the actual referrer has no
# query params too.
referrer = request.headers.get(b"referer", b"").split(b"?")[0]
referrer_policy = request.GET.first(b"referrer_policy")
expected_referrer = request.GET.first(b"expected_referrer", b"")
response_headers = [(b"Content-Type", b"text/javascript"),
(b"Access-Control-Allow-Origin", b"*")]
if referrer_policy == b"no-referrer" or referrer_policy == b"origin":
if referrer == expected_referrer:
return (200, response_headers, u"")
return (404, response_headers)
if referrer_policy == b"same-origin":
if referrer == expected_referrer:
return (200, response_headers, u"")
return (404, response_headers)
return (404, response_headers)