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def main(request, response):
headers = [(b"Content-Type", b"text/plain")]
stashed_data = {b'control_request_headers': b"", b'preflight': b"0", b'preflight_referrer': b""}
token = None
if b"token" in request.GET:
token = request.GET.first(b"token")
if b"origin" in request.GET:
for origin in request.GET[b'origin'].split(b", "):
headers.append((b"Access-Control-Allow-Origin", origin))
else:
headers.append((b"Access-Control-Allow-Origin", b"*"))
if b"clear-stash" in request.GET:
if request.server.stash.take(token) is not None:
return headers, b"1"
else:
return headers, b"0"
if b"credentials" in request.GET:
headers.append((b"Access-Control-Allow-Credentials", b"true"))
if request.method == u"OPTIONS":
if not b"Access-Control-Request-Method" in request.headers:
response.set_error(400, u"No Access-Control-Request-Method header")
return b"ERROR: No access-control-request-method in preflight!"
if request.headers.get(b"Accept", b"") != b"*/*":
response.set_error(400, u"Request does not have 'Accept: */*' header")
return b"ERROR: Invalid access in preflight!"
if b"control_request_headers" in request.GET:
stashed_data[b'control_request_headers'] = request.headers.get(b"Access-Control-Request-Headers", None)
if b"max_age" in request.GET:
headers.append((b"Access-Control-Max-Age", request.GET[b'max_age']))
if b"allow_headers" in request.GET:
headers.append((b"Access-Control-Allow-Headers", request.GET[b'allow_headers']))
if b"allow_methods" in request.GET:
headers.append((b"Access-Control-Allow-Methods", request.GET[b'allow_methods']))
preflight_status = 200
if b"preflight_status" in request.GET:
preflight_status = int(request.GET.first(b"preflight_status"))
stashed_data[b'preflight'] = b"1"
stashed_data[b'preflight_referrer'] = request.headers.get(b"Referer", b"")
stashed_data[b'preflight_user_agent'] = request.headers.get(b"User-Agent", b"")
if token:
request.server.stash.put(token, stashed_data)
return preflight_status, headers, b""
if token:
data = request.server.stash.take(token)
if data:
stashed_data = data
if b"checkUserAgentHeaderInPreflight" in request.GET and request.headers.get(b"User-Agent") != stashed_data[b'preflight_user_agent']:
return 400, headers, b"ERROR: No user-agent header in preflight"
#use x-* headers for returning value to bodyless responses
headers.append((b"Access-Control-Expose-Headers", b"x-did-preflight, x-control-request-headers, x-referrer, x-preflight-referrer, x-origin"))
headers.append((b"x-did-preflight", stashed_data[b'preflight']))
if stashed_data[b'control_request_headers'] != None:
headers.append((b"x-control-request-headers", stashed_data[b'control_request_headers']))
headers.append((b"x-preflight-referrer", stashed_data[b'preflight_referrer']))
headers.append((b"x-referrer", request.headers.get(b"Referer", b"")))
headers.append((b"x-origin", request.headers.get(b"Origin", b"")))
if token:
request.server.stash.put(token, stashed_data)
return headers, b""
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