validators.py

def validate_side(side):
    side = side.upper()

    if side not in ["BUY", "SELL"]:
        raise ValueError("Side must be BUY or SELL")

    return side


def validate_order_type(order_type):
    order_type = order_type.upper()

    if order_type not in ["MARKET", "LIMIT"]:
        raise ValueError("Order Type must be MARKET or LIMIT")

    return order_type


def validate_quantity(quantity):
    quantity = float(quantity)

    if quantity <= 0:
        raise ValueError("Quantity must be greater than 0")

    return quantity


def validate_symbol(symbol):
    symbol = symbol.upper()

    if not symbol.endswith("USDT"):
        raise ValueError("Symbol must end with USDT")

    return symbol