chuanqi/cq2_sdk/scripts/decode_env.py

"""Decode 996box env.json files and write results to decode_env_output.txt.

Finds the base64 payload dynamically, handles non-UTF-8 bytes, and
saves results to a file (avoids Windows console encoding issues).
"""
import base64
import json
from pathlib import Path

OUT_FILE = Path("decode_env_output.txt")
SENSITIVE_KEYS = ("sign", "key", "token", "password", "pwd")


def try_decode(b64_candidate: str) -> dict | None:
    try:
        padded = b64_candidate + "=" * (-len(b64_candidate) % 4)
        decoded = base64.urlsafe_b64decode(padded)
        obj = json.loads(decoded.decode("utf-8", errors="replace"))
        if isinstance(obj, dict):
            return obj
    except Exception:
        return None
    return None


def show(path: Path, lines: list[str]) -> None:
    lines.append(f"=== {path} ===")
    if not path.exists():
        lines.append("  not found")
        lines.append("")
        return
    raw = path.read_bytes()
    lines.append(f"  size: {len(raw)} bytes")
    # Show first 40 bytes as hex + repr to handle non-UTF-8
    lines.append(f"  first 40 bytes (hex): {raw[:40].hex()}")
    lines.append(f"  first 40 bytes (repr): {raw[:40]!r}")

    text = raw.decode("utf-8", errors="replace")

    # Find base64 payload start (MeyJ = base64url of '{"')
    for marker_idx, marker in enumerate(("MeyJ", "eyJ", "{")):
        idx = text.find(marker)
        if idx < 0:
            continue
        b64 = text[idx:].rstrip()
        if marker == "{":
            # Try raw JSON parse
            try:
                obj = json.loads(b64)
                if isinstance(obj, dict):
                    lines.append(f"  parsed as raw JSON from position {idx}")
                    lines.append(f"  keys: {list(obj.keys())}")
                    for k, v in obj.items():
                        is_sensitive = any(s in k.lower() for s in SENSITIVE_KEYS)
                        if is_sensitive and isinstance(v, str):
                            lines.append(f"    {k}: ***REDACTED***  (len={len(v)})")
                        else:
                            sv = str(v)
                            display = sv[:120] + ("..." if len(sv) > 120 else "")
                            lines.append(f"    {k}: {display}")
                    lines.append("")
                    return
            except Exception:
                pass
        else:
            obj = try_decode(b64)
            if obj is not None:
                lines.append(f"  decoded via base64url from position {idx} ({len(b64)} chars)")
                lines.append(f"  decoded keys: {list(obj.keys())}")
                for k, v in obj.items():
                    is_sensitive = any(s in k.lower() for s in SENSITIVE_KEYS)
                    if is_sensitive and isinstance(v, str):
                        lines.append(f"    {k}: ***REDACTED***  (len={len(v)})")
                    else:
                        sv = str(v)
                        display = sv[:120] + ("..." if len(sv) > 120 else "")
                        lines.append(f"    {k}: {display}")
                lines.append("")
                return

    # Last resort: show the raw text truncated
    lines.append("  could not decode; raw text (truncated):")
    lines.append(f"    {text[:200]!r}")
    lines.append("")


def main() -> int:
    lines: list[str] = []
    lines.append("996box env.json decoder output")
    lines.append("=" * 60)
    lines.append("")

    for path_str in [
        r"D:\ProgramFiles\996box\GameBoxDownload\1\env.json",
        r"D:\ProgramFiles\996box\GameBoxDownload\1\cq\env.json",
    ]:
        show(Path(path_str), lines)

    OUT_FILE.write_text("\n".join(lines), encoding="utf-8")
    print(f"output written to: {OUT_FILE.resolve()}")
    print(f"file size: {OUT_FILE.stat().st_size} bytes")
    return 0


if __name__ == "__main__":
    import sys
    sys.exit(main())