Files

124 lines
4.2 KiB
Python
Executable File

#!/usr/bin/env python3
"""Give ClaudeAlt an independent Electron identity without changing its protocol."""
import copy
import hashlib
import json
import struct
import sys
from pathlib import Path
path = Path(sys.argv[1])
data = path.read_bytes()
if len(data) < 16:
raise SystemExit("ClaudeAlt app.asar is too small")
_, _, _, header_size = struct.unpack("<IIII", data[:16])
header = json.loads(data[16 : 16 + header_size])
base_offset = 16 + ((header_size + 3) & ~3)
output = bytearray()
counts = {"package": 0, "socket": 0, "user_agent": 0}
def integrity(content: bytes, block_size: int) -> dict:
blocks = [
hashlib.sha256(content[index : index + block_size]).hexdigest()
for index in range(0, len(content), block_size)
] or [hashlib.sha256(b"").hexdigest()]
return {
"algorithm": "SHA256",
"hash": hashlib.sha256(content).hexdigest(),
"blockSize": block_size,
"blocks": blocks,
}
def rebuild(node: dict, prefix: str = "") -> dict:
result = {}
for name, child in node.get("files", {}).items():
item_path = f"{prefix}/{name}" if prefix else name
if "files" in child:
result[name] = {
**{key: value for key, value in child.items() if key != "files"},
"files": rebuild(child, item_path),
}
continue
entry = copy.deepcopy(child)
if entry.get("unpacked"):
result[name] = entry
continue
offset, size = int(entry["offset"]), int(entry["size"])
content = data[base_offset + offset : base_offset + offset + size]
changed = False
if item_path == "package.json":
package = json.loads(content)
expected = {
"productName": "Claude",
"desktopName": "com.anthropic.Claude.desktop",
}
for field, value in expected.items():
if package.get(field) != value:
raise SystemExit(
f"unexpected Claude package.json {field}: "
f"{package.get(field)!r} != {value!r}"
)
package["productName"] = "ClaudeAlt"
package["desktopName"] = "com.anthropic.ClaudeAlt.desktop"
content = (json.dumps(package, indent=2) + "\n").encode()
counts["package"] += 1
changed = True
old_socket = b"claude-cowork-vm.sock"
socket_count = content.count(old_socket)
if socket_count:
content = content.replace(old_socket, b"claude-alt-cowork-vm.sock")
counts["socket"] += socket_count
changed = True
marker = b'P.app.isPackaged||P.app.setName("Claude");RRn();'
marker_count = content.count(marker)
if marker_count:
content = content.replace(
marker,
b'P.app.isPackaged||P.app.setName("Claude");'
b'P.app.userAgentFallback=P.app.userAgentFallback'
b'.replaceAll("ClaudeAlt","Claude");RRn();',
)
counts["user_agent"] += marker_count
changed = True
entry["offset"] = str(len(output))
if changed:
entry["size"] = len(content)
block_size = entry.get("integrity", {}).get("blockSize", 4194304)
entry["integrity"] = integrity(content, block_size)
output.extend(content)
result[name] = entry
return result
rebuilt_header = {"files": rebuild(header)}
if counts != {"package": 1, "socket": 1, "user_agent": 1}:
raise SystemExit(f"unexpected ClaudeAlt patch counts: {counts}")
header_bytes = json.dumps(rebuilt_header, separators=(",", ":")).encode()
padded_size = (len(header_bytes) + 3) & ~3
patched = (
struct.pack("<IIII", 4, padded_size + 8, padded_size + 4, len(header_bytes))
+ header_bytes
+ b"\0" * (padded_size - len(header_bytes))
+ bytes(output)
)
required = (
b"com.anthropic.ClaudeAlt.desktop",
b'"productName": "ClaudeAlt"',
b'.replaceAll("ClaudeAlt","Claude")',
b"claude-alt-cowork-vm.sock",
)
if any(patched.count(value) != 1 for value in required):
raise SystemExit("ClaudeAlt identity verification failed")
path.write_bytes(patched)