Split share.py into modules by responsibility

config.py  — share.config loading, constants, load_config(), client_cfg()
cert.py    — get_local_ip(), ensure_cert()
cleanup.py — cleanup_loop()
server.py  — ShareServer, Handler, file_type()
share.py   — main() entry point only

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

config.py

@@ -0,0 +1,62 @@
+"""Configuration: share.config loading, constants, CLI args."""
+
+import argparse
+import configparser
+from pathlib import Path
+
+BASE_DIR = Path(__file__).resolve().parent
+
+_cp = configparser.ConfigParser()
+_cp.read_dict({
+    "server": {
+        "port": "3001", "dir": str(Path.home() / "Downloads" / "shared"),
+        "ttl": "7", "san": "", "lang": "ru", "refresh": "5",
+        "per_page": "10,25,50,100",
+    },
+    "internal": {
+        "secs_per_day": "86400", "cleanup_interval": "3600",
+        "ssl_handshake_timeout": "5", "sniff_size": "8192",
+        "chunk_size": "65536", "cert_days": "3650", "cert_key_bits": "2048",
+        "toast_ms": "2500", "progress_hide_ms": "1200",
+    },
+})
+_cp.read(BASE_DIR / "share.config")
+
+SECS_PER_DAY = _cp.getint("internal", "secs_per_day")
+CLEANUP_INTERVAL = _cp.getint("internal", "cleanup_interval")
+SSL_HANDSHAKE_TIMEOUT = _cp.getint("internal", "ssl_handshake_timeout")
+SNIFF_SIZE = _cp.getint("internal", "sniff_size")
+CHUNK_SIZE = _cp.getint("internal", "chunk_size")
+CERT_DAYS = _cp.getint("internal", "cert_days")
+CERT_KEY_BITS = _cp.getint("internal", "cert_key_bits")
+
+
+def load_config() -> dict:
+    """Load config: share.config defaults <- CLI args."""
+    conf = dict(_cp["server"])
+
+    p = argparse.ArgumentParser(description="Share — local file sharing server")
+    p.add_argument("-p", "--port", type=int)
+    p.add_argument("-d", "--dir")
+    p.add_argument("--ttl", type=int)
+    p.add_argument("--san", nargs="*")
+    p.add_argument("--lang")
+    p.add_argument("--refresh", type=int)
+    args = p.parse_args()
+
+    for key, val in vars(args).items():
+        if val is not None:
+            conf[key] = " ".join(val) if isinstance(val, list) else str(val)
+
+    return conf
+
+
+def client_cfg(conf: dict) -> dict:
+    """Build config dict to inject into HTML as CFG."""
+    return {
+        "lang": conf["lang"],
+        "refresh": int(conf["refresh"]),
+        "perPage": [int(x) for x in conf["per_page"].split(",")],
+        "toastMs": _cp.getint("internal", "toast_ms"),
+        "progressHideMs": _cp.getint("internal", "progress_hide_ms"),
+    }