Create link_parser.py

bot/core/link_parser.py

@@ -0,0 +1,41 @@
+# PATH: bot/core/link_parser.py
+from __future__ import annotations
+
+import re
+from typing import Tuple, Union, Optional
+
+ChatRef = Union[int, str]
+
+_TME_RE = re.compile(
+    r"^(?:https?://)?t\.me/(?:(?:c/)?(?P<cchat>\d+)|(?P<user>[A-Za-z0-9_]{4,}))/+(?P<msg>\d+)",
+    re.IGNORECASE,
+)
+
+def parse_link(link: str) -> Optional[Tuple[ChatRef, int]]:
+    if not link:
+        return None
+    link = link.strip().split("?", 1)[0].rstrip("/")
+
+    m = _TME_RE.match(link)
+    if not m:
+        parts = link.strip("/").split("/")
+        if len(parts) >= 2:
+            chat = parts[-2]
+            msg = parts[-1]
+            try:
+                mid = int(msg)
+            except Exception:
+                return None
+            try:
+                cid = int(chat)
+                return cid, mid
+            except Exception:
+                return chat, mid
+        return None
+
+    msg_id = int(m.group("msg"))
+    if m.group("cchat"):
+        internal = m.group("cchat")
+        return int("-100" + internal), msg_id
+
+    return m.group("user"), msg_id