Add calc_market_listing_fee util function.

aiosteampy/mixins/market.py

@@ -1,7 +1,6 @@
 from contextlib import suppress
 from typing import overload, Literal, TypeAlias, AsyncIterator, Callable
 from datetime import datetime
-from math import floor
 from re import search as re_search
 
 from aiohttp import ClientResponseError
@@ -34,7 +33,7 @@
 )
 from ..helpers import currency_required
 from ..exceptions import EResultError, SessionExpired
-from ..utils import create_ident_code, buyer_pays_to_receive
+from ..utils import create_ident_code, buyer_pays_to_receive, calc_market_listing_fee
 from .public import SteamCommunityPublicMixin, T_SHARED_DESCRIPTIONS
 from .confirmation import ConfirmationMixin
 
@@ -858,7 +857,7 @@ async def buy_market_listing(
             if app is None or market_hash_name is None or price is None:
                 raise ValueError("`app`, `market_hash_name` and `price` arguments must be provided")
 
-        fee = fee or ((floor(price * 0.05) or 1) + (floor(price * 0.10) or 1))
+        fee = fee or calc_market_listing_fee(price)
         data = {
             "sessionid": self.session_id,
             "currency": self.currency.value,

aiosteampy/utils.py

@@ -49,6 +49,7 @@
     "attribute_required",
     "make_inspect_url",
     "add_cookie_to_session",
+    "calc_market_listing_fee",
 )
 
 
@@ -491,3 +492,18 @@ def add_cookie_to_session(
         c[name]["httponly"] = httponly
 
     session.cookie_jar.update_cookies(cookies=c, response_url=url)
+
+
+def calc_market_listing_fee(price: int, *, wallet_fee=0.05, publisher_fee=0.10, minimal_fee=1) -> int:
+    """
+    Calculate market fee for listing.
+
+    Use `get_wallet_info` method of the client to see fees values for specified `Steam` account
+
+    :param price: price of market listing
+    :param wallet_fee:
+    :param publisher_fee:
+    :param minimal_fee: minimal fee value
+    :return: calculated fee of price as integer
+    """
+    return (floor(price * wallet_fee) or minimal_fee) + (floor(price * publisher_fee) or minimal_fee)