Create Relay Bot MVP

app/common/security.py

@@ -0,0 +1,23 @@
+import re
+
+MAX_MESSAGE_CHARS = 12_000
+
+
+def is_owner(user_id: int | None, owner_id: int) -> bool:
+    return user_id is not None and user_id == owner_id
+
+
+def is_allowed_chat(chat_id: int, chat_type: str, project_group_id: int, owner_id: int) -> bool:
+    return chat_id == project_group_id or (chat_type == "private" and chat_id == owner_id)
+
+
+def redact_for_logs(text: str) -> str:
+    return f"<redacted:{len(text)} chars>"
+
+
+def clean_user_text(text: str) -> str:
+    return text.strip()[:MAX_MESSAGE_CHARS]
+
+
+def safe_filename(name: str) -> str:
+    return re.sub(r"[^A-Za-z0-9._-]", "_", name).strip(".") or "attachment"