84 lines
3 KiB
Python
84 lines
3 KiB
Python
"""websocket proxy consumer"""
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import threading
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from logging import getLogger
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from ssl import CERT_NONE
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import websocket
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from channels.generic.websocket import WebsocketConsumer
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from passbook.app_gw.models import ApplicationGatewayProvider
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LOGGER = getLogger(__name__)
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class ProxyConsumer(WebsocketConsumer):
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"""Proxy websocket connection to upstream"""
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_headers_dict = {}
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_app_gw = None
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_client = None
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_thread = None
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def _fix_headers(self, input_dict):
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"""Fix headers from bytestrings to normal strings"""
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return {
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key.decode('utf-8'): value.decode('utf-8')
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for key, value in dict(input_dict).items()
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}
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def connect(self):
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"""Extract host header, lookup in database and proxy connection"""
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self._headers_dict = self._fix_headers(dict(self.scope.get('headers')))
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host = self._headers_dict.pop('host')
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query_string = self.scope.get('query_string').decode('utf-8')
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matches = ApplicationGatewayProvider.objects.filter(
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server_name__contains=[host],
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enabled=True)
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if matches.exists():
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self._app_gw = matches.first()
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# TODO: Get upstream that starts with wss or
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upstream = self._app_gw.upstream[0].replace('http', 'ws') + self.scope.get('path')
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if query_string:
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upstream += '?' + query_string
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sslopt = {}
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if not self._app_gw.upstream_ssl_verification:
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sslopt = {"cert_reqs": CERT_NONE}
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self._client = websocket.WebSocketApp(
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url=upstream,
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subprotocols=self.scope.get('subprotocols'),
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header=self._headers_dict,
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on_message=self._client_on_message_handler(),
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on_error=self._client_on_error_handler(),
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on_close=self._client_on_close_handler(),
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on_open=self._client_on_open_handler())
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LOGGER.debug("Accepting connection for %s", host)
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self._thread = threading.Thread(target=lambda: self._client.run_forever(sslopt=sslopt))
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self._thread.start()
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def _client_on_open_handler(self):
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return lambda ws: self.accept(self._client.sock.handshake_response.subprotocol)
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def _client_on_message_handler(self):
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# pylint: disable=unused-argument,invalid-name
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def message_handler(ws, message):
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if isinstance(message, str):
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self.send(text_data=message)
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else:
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self.send(bytes_data=message)
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return message_handler
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def _client_on_error_handler(self):
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return lambda ws, error: print(error)
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def _client_on_close_handler(self):
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return lambda ws: self.disconnect(0)
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def disconnect(self, code):
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self._client.close()
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def receive(self, text_data=None, bytes_data=None):
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if text_data:
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opcode = websocket.ABNF.OPCODE_TEXT
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if bytes_data:
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opcode = websocket.ABNF.OPCODE_BINARY
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self._client.send(text_data or bytes_data, opcode)
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