71 lines
2.5 KiB
Python
71 lines
2.5 KiB
Python
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from socketserver import StreamRequestHandler, TCPServer
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from src import endpoints
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from src import schema
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from src import db
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import json
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class RequestHandler(StreamRequestHandler):
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"""
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Receieves and processes json input; dispatches input to the
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requested endpoint, or responds with error objects.
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"""
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def reply(self, obj):
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self.wfile.write(bytes(json.dumps(obj), "utf8"))
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def handle(self):
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try:
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request = json.loads(str(self.rfile.read(), "utf8"))
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endpoint = request.get("method")
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if endpoint not in endpoints.endpoints:
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return self.reply(schema.error(2, "Invalid endpoint"))
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# check to make sure all the arguments for endpoint are provided
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elif any([key not in request for key in endpoints.endpoints[endpoint]]):
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return self.reply(schema.error(3, "{} requires: {}".format(
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endpoint, ", ".join(endpoints.endpoints[endpoint]))))
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elif endpoint not in endpoints.authless:
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if not request.get("user"):
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return self.reply(schema.error(4, "No username provided."))
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user = db.user_resolve(request["user"])
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request["user"] = user
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if not user:
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return self.reply(schema.error(5, "User not registered"))
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elif endpoint != "check_auth" and not \
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db.user_auth(user, request.get("auth_hash")):
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return self.reply(schema.error(6, "Authorization failed."))
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# post_ids are always returned as integers, but for callers who
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# provide them as something else, try to convert them.
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if isinstance(request.get("post_id"), (float, str)):
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try: request["post_id"] = int(request["post_id"])
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except Exception:
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return schema.error(3, "Non-numeric post_id")
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# exception handling is now passed to the endpoints;
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# anything unhandled beyond here is a code 1
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self.reply(eval("endpoints." + endpoint)(request))
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except json.decoder.JSONDecodeError as E:
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return self.reply(schema.error(0, str(E)))
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except Exception as E:
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return self.reply(schema.error(1, str(E)))
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def run(host, port):
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server = TCPServer((host, port), RequestHandler)
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try:
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server.serve_forever()
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except KeyboardInterrupt:
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print("bye")
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server.server_close()
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