a39d025a04
Fairly invasive, but will help make lib.base useful again. No more Message / ProxiedMessage split!
98 lines
3.8 KiB
Python
98 lines
3.8 KiB
Python
"""
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Make all object textures Jeff Bezos
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Helpful for migrating your region to AWS
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"""
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import copy
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import ctypes
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import random
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import secrets
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from hippolyzer.lib.base.datatypes import UUID
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from hippolyzer.lib.proxy.addon_utils import BaseAddon, SessionProperty
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from hippolyzer.lib.base.message.message import Message
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from hippolyzer.lib.proxy.region import ProxiedRegion
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from hippolyzer.lib.proxy.sessions import Session
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BEZOS_UUIDS = [UUID(x) for x in [
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"b8b8dcf9-758a-4539-ba63-793a01407236",
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"0010533a-cd41-44de-9a74-ab2125cbef8f",
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]]
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def _modify_crc(crc_tweak: int, crc_val: int):
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return ctypes.c_uint32(crc_val ^ crc_tweak).value
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def _bezosify_te(local_id, parsed_te):
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parsed_te = copy.copy(parsed_te)
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parsed_te.Textures = {None: BEZOS_UUIDS[local_id % len(BEZOS_UUIDS)]}
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return parsed_te
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class BezosifyAddon(BaseAddon):
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bezos_crc_xor: int = SessionProperty()
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def handle_session_init(self, session: Session):
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# We want CRCs that are stable for the duration of the session, but will
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# cause a cache miss for objects cached before this session. Generate a
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# random value to XOR all CRCs with
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self.bezos_crc_xor = secrets.randbits(32)
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def handle_lludp_message(self, session: Session, region: ProxiedRegion, message: Message):
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if message.name == "ObjectUpdateCached":
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for block in message["ObjectData"]:
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# Cached only really has a CRC, this will force the cache miss.
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block["CRC"] = _modify_crc(self.bezos_crc_xor, block["CRC"])
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elif message.name == "ObjectUpdate":
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for block in message["ObjectData"]:
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block["CRC"] = _modify_crc(self.bezos_crc_xor, block["CRC"])
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parsed_te = block.deserialize_var("TextureEntry")
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if not parsed_te:
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continue
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parsed_te = _bezosify_te(block["ID"], parsed_te)
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block.serialize_var("TextureEntry", parsed_te)
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elif message.name == "ImprovedTerseObjectUpdate":
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for block in message["ObjectData"]:
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parsed_te = block.deserialize_var("TextureEntry")
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if not parsed_te:
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continue
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update_data = block.deserialize_var("Data")
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parsed_te = _bezosify_te(update_data["ID"], parsed_te)
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block.serialize_var("TextureEntry", parsed_te)
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elif message.name == "AvatarAppearance":
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for block in message["ObjectData"]:
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parsed_te = block.deserialize_var("TextureEntry")
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if not parsed_te:
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continue
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# Need an integer ID to choose a bezos texture, just use
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# the last byte of the sender's UUID.
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sender_id = message["Sender"]["ID"]
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parsed_te = _bezosify_te(sender_id.bytes[-1], parsed_te)
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block.serialize_var("TextureEntry", parsed_te)
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elif message.name == "ObjectUpdateCompressed":
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for block in message["ObjectData"]:
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update_data = block.deserialize_var("Data")
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if not update_data:
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continue
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update_data["CRC"] = _modify_crc(self.bezos_crc_xor, update_data["CRC"])
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if not update_data.get("TextureEntry"):
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continue
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update_data["TextureEntry"] = _bezosify_te(
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update_data["ID"],
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update_data["TextureEntry"],
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)
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block.serialize_var("Data", update_data)
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elif message.name == "RegionHandshake":
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for field_name, val in message["RegionInfo"][0].items():
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if field_name.startswith("Terrain") and isinstance(val, UUID):
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message["RegionInfo"][field_name] = random.choice(BEZOS_UUIDS)
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addons = [BezosifyAddon()]
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