Add token validation util, fix deepcopy of sessions and make bot hashable and comparable

aiogram/utils/token.py

@@ -0,0 +1,42 @@
+from functools import lru_cache
+
+
+class TokenValidationError(Exception):
+    pass
+
+
+@lru_cache()
+def validate_token(token: str) -> bool:
+    """
+    Validate Telegram token
+
+    :param token:
+    :return:
+    """
+    if not isinstance(token, str):
+        raise TokenValidationError(
+            f"Token is invalid! It must be 'str' type instead of {type(token)} type."
+        )
+
+    if any(x.isspace() for x in token):
+        message = "Token is invalid! It can't contains spaces."
+        raise TokenValidationError(message)
+
+    left, sep, right = token.partition(":")
+    if (not sep) or (not left.isdigit()) or (not right):
+        raise TokenValidationError("Token is invalid!")
+
+    return True
+
+
+@lru_cache()
+def extract_bot_id(token: str) -> int:
+    """
+    Extract bot ID from Telegram token
+
+    :param token:
+    :return:
+    """
+    validate_token(token)
+    raw_bot_id, *_ = token.split(":")
+    return int(raw_bot_id)