"""Validation functions for product submission API endpoint."""

# The list of fields we accept via API on initial product submission. No other
# fields would be passed to the data persistence layer.
# (JSON schema validation happens earlier and only validates the fields we
# explicitly specify.)
PRODUCT_INITIALLY_ALLOWED_FIELDS = (
    'product_id',
    'orchard_product_id',
    'upc',
    'itunes_vendor_id',
    'provider',
    'store_id',
    'delivery_date',
    'sales_start_date',
    'force_polling',
)


def filter_initial_product_fields(data_dict):
    """Filter data received via API to contain only initial product fields.

    Args:
        data_dict (dict): A dictionary data decoded from JSON API request.

    Returns:
        dict: A dictionary with all non-initial fields filtered out.
    """
    return {
        k: data_dict[k] for k in data_dict
        if k in PRODUCT_INITIALLY_ALLOWED_FIELDS
    }