feat(exchange): apply ft_has overrides in check_exchange

freqtrade/exchange/check_exchange.py

@@ -1,15 +1,30 @@
 import logging
+from typing import Any
 
 from freqtrade.constants import Config
 from freqtrade.enums import RunMode
 from freqtrade.exceptions import OperationalException
 from freqtrade.exchange import available_exchanges, is_exchange_known_ccxt, validate_exchange
 from freqtrade.exchange.common import MAP_EXCHANGE_CHILDCLASS, SUPPORTED_EXCHANGES
+from freqtrade.resolvers.exchange_resolver import ExchangeResolver
 
 
 logger = logging.getLogger(__name__)
 
 
+def _get_ft_has_overrides(exchange_name: str) -> dict[str, Any] | None:
+    subclassed = {e["name"].lower(): e for e in ExchangeResolver.search_all_objects({}, False)}
+    mapped = MAP_EXCHANGE_CHILDCLASS.get(exchange_name.lower(), exchange_name.lower()).lower()
+    resolved = subclassed.get(mapped)
+    if not resolved:
+        return None
+
+    get_ft_has = getattr(resolved["class"], "get_ft_has", None)
+    if callable(get_ft_has):
+        return get_ft_has() or None
+    return None
+
+
 def check_exchange(config: Config, check_for_bad: bool = True) -> bool:
     """
     Check if the exchange name in the config file is supported by Freqtrade
@@ -47,7 +62,8 @@ def check_exchange(config: Config, check_for_bad: bool = True) -> bool:
             f"{', '.join(available_exchanges())}"
         )
 
-    valid, reason, _, _ = validate_exchange(exchange)
+    ft_has_overrides = _get_ft_has_overrides(exchange)
+    valid, reason, _, _ = validate_exchange(exchange, ft_has_overrides)
     if not valid:
         if check_for_bad:
             raise OperationalException(
@@ -72,3 +88,4 @@ def check_exchange(config: Config, check_for_bad: bool = True) -> bool:
         )
 
     return True
+