def _update_peer_version(self, response):
vser = None
server_header = response.headers.get("server", None)
if server_header is not None:
server_name, server_ver = http.parse_user_agent(server_header)
if (server_name != FEAT_IDENT
or len(server_ver) != 1
or not isinstance(server_ver[0], int)):
raise TunnelError("Unsupported server %r" % server_header)
vser = server_ver[0]
vin = self._tunnel._version
vout = vser if vser is not None and vser < vin else vin
self._peer_version = vser
self._target_version = vout
self._headers["user-agent"] = http.compose_user_agent(FEAT_IDENT, vout)
return response
def parse_user_agent(self):
agent = self.get_received_header("user-agent")
if not agent:
return "unknown", None
return http.parse_user_agent(agent)
def onAllContentReceived(self):
vout = self.channel.owner._version
ctype = self.get_received_header("content-type")
if ctype != "application/json":
self._error(http.Status.UNSUPPORTED_MEDIA_TYPE,
"Message content type not supported, "
"only application/json is.")
return
agent_header = self.get_received_header("user-agent")
if agent_header is None:
self._error(http.Status.BAD_REQUEST, "No user agent specified.")
return
agent_name, agent_ver = http.parse_user_agent(agent_header)
if ((agent_name != FEAT_IDENT)
or len(agent_ver) != 1
or not isinstance(agent_ver[0], int)):
self._error(http.Status.BAD_REQUEST, "User agent not supported.")
return
vcli = agent_ver[0]
if self.method is http.Methods.HEAD:
vin = vcli if vcli is not None and vcli < vout else vout
server_header = http.compose_user_agent(FEAT_IDENT, vin)
self.set_header("server", server_header)
self.set_length(0)
self.finish()
return
if self.method is http.Methods.POST:
if vcli is not None and vcli > vout:
# not safe, better fail
self._error(http.Status.UNSUPPORTED_MEDIA_TYPE,
"Message version not supported.")
return
host_header = self.get_received_header("host")
if host_header is None:
self._error(http.Status.BAD_REQUEST,
"Message without host header.")
return
scheme = self.channel.owner._scheme
host, port = http.parse_host(host_header, scheme)
uri = http.compose(self.uri, host=host, port=port, scheme=scheme)
vin = vcli if vcli is not None else vout
unserializer = json.Unserializer(registry=self._registry,
source_ver=vin, target_ver=vout)
body = "".join(self._buffer)
try:
data = unserializer.convert(body)
except Exception as e:
msg = "Error while unserializing tunnel message"
error.handle_exception(self, e, msg)
self._error(http.Status.BAD_REQUEST,
"Invalid message, unserialization failed.")
return
self.channel.owner._dispatch(uri, data)
self.set_response_code(http.Status.OK)
server_header = http.compose_user_agent(FEAT_IDENT, vin)
self.set_header("server", server_header)
self.set_length(0)
self.finish()
return
self.set_response_code(http.Status.NOT_ALLOWED)
self.set_header("content-type", "plain/text")
self.write("Method not allowed, only POST and HEAD.")
self.finish()
