Weight Based Shipping fix

Weight Based Shipping fix

<?php
/**
 * Plugin Name: WFACP — make shipping Phone actually required (Weight Based Shipping fix)
 *
 * In plain terms:
 *   The shipping "Phone" field is set to required, but customers can still
 *   check out with it empty. This puts the requirement back.
 *
 * Why it broke:
 *   In this checkout layout WooCommerce doesn't re-check shipping fields, and the
 *   Weight Based Shipping plugin's "always show shipping" behaviour makes FunnelKit
 *   forget the Phone field was required at the moment the order is placed.
 */

defined( 'ABSPATH' ) || exit;

add_action(
	'woocommerce_checkout_process',
	static function (): void {
		if ( ! class_exists( 'WFACP_Common' ) ) {
			return;
		}
		$id = WFACP_Common::get_id();
		if ( empty( $id ) ) {
			return; // Not a FunnelKit checkout.
		}

		$fields = WFACP_Common::get_checkout_fields( $id );
		if ( empty( $fields['shipping']['shipping_phone']['required'] ) || ! wc_string_to_bool( $fields['shipping']['shipping_phone']['required'] ) ) {
			return;
		}

		// Respect intl-tel-input hiding the field (e.g. ship-to-same collapses shipping).
		// phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		$phone = isset( $_POST['wfacp_input_phone_field'] ) ? json_decode( stripslashes_deep( wp_unslash( $_POST['wfacp_input_phone_field'] ) ), true ) : array();
		if ( isset( $phone['shipping']['hidden'] ) && 'yes' === $phone['shipping']['hidden'] ) {
			return;
		}

		// phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		if ( ! isset( $_POST['shipping_phone'] ) || '' !== trim( wc_clean( wp_unslash( $_POST['shipping_phone'] ) ) ) ) {
			return;
		}

		$label   = isset( $fields['shipping']['shipping_phone']['label'] ) ? $fields['shipping']['shipping_phone']['label'] : __( 'Phone', 'woocommerce' );
		$message = sprintf( __( '%s is a required field.', 'woocommerce' ), '<strong>' . esc_html( $label ) . '</strong>' );

		// Dedupe in case FunnelKit's own validator already added it.
		if ( ! ( function_exists( 'wc_has_notice' ) && wc_has_notice( $message, 'error' ) ) ) {
			wc_add_notice( $message, 'error' );
		}
	},
	20
);