includes/shipping/flat-rate/class-wc-shipping-flat-rate.php
<?php
/**
* Flat Rate Shipping Method.
*
* @version 2.6.0
* @package WooCommerce\Classes\Shipping
*/
defined( 'ABSPATH' ) || exit;
/**
* WC_Shipping_Flat_Rate class.
*/
class WC_Shipping_Flat_Rate extends WC_Shipping_Method {
/**
* Cost passed to [fee] shortcode.
*
* @var string Cost.
*/
protected $fee_cost = '';
/**
* Constructor.
*
* @param int $instance_id Shipping method instance ID.
*/
public function __construct( $instance_id = 0 ) {
$this->id = 'flat_rate';
$this->instance_id = absint( $instance_id );
$this->method_title = __( 'Flat rate', 'woocommerce' );
$this->method_description = __( 'Lets you charge a fixed rate for shipping.', 'woocommerce' );
$this->supports = array(
'shipping-zones',
'instance-settings',
'instance-settings-modal',
);
$this->init();
add_action( 'woocommerce_update_options_shipping_' . $this->id, array( $this, 'process_admin_options' ) );
}
/**
* Init user set variables.
*/
public function init() {
$this->instance_form_fields = include __DIR__ . '/includes/settings-flat-rate.php';
$this->title = $this->get_option( 'title' );
$this->tax_status = $this->get_option( 'tax_status' );
$this->cost = $this->get_option( 'cost' );
$this->type = $this->get_option( 'type', 'class' );
}
/**
* Evaluate a cost from a sum/string.
*
* @param string $sum Sum of shipping.
* @param array $args Args, must contain `cost` and `qty` keys. Having `array()` as default is for back compat reasons.
* @return string
*/
protected function evaluate_cost( $sum, $args = array() ) {
// Add warning for subclasses.
if ( ! is_array( $args ) || ! array_key_exists( 'qty', $args ) || ! array_key_exists( 'cost', $args ) ) {
wc_doing_it_wrong( __FUNCTION__, '$args must contain `cost` and `qty` keys.', '4.0.1' );
}
include_once WC()->plugin_path() . '/includes/libraries/class-wc-eval-math.php';
// Allow 3rd parties to process shipping cost arguments.
$args = apply_filters( 'woocommerce_evaluate_shipping_cost_args', $args, $sum, $this );
$locale = localeconv();
$decimals = array( wc_get_price_decimal_separator(), $locale['decimal_point'], $locale['mon_decimal_point'], ',' );
$this->fee_cost = $args['cost'];
// Expand shortcodes.
add_shortcode( 'fee', array( $this, 'fee' ) );
$sum = do_shortcode(
str_replace(
array(
'[qty]',
'[cost]',
),
array(
$args['qty'],
$args['cost'],
),
$sum
)
);
remove_shortcode( 'fee', array( $this, 'fee' ) );
// Remove whitespace from string.
$sum = preg_replace( '/\s+/', '', $sum );
// Remove locale from string.
$sum = str_replace( $decimals, '.', $sum );
// Trim invalid start/end characters.
$sum = rtrim( ltrim( $sum, "\t\n\r\0\x0B+*/" ), "\t\n\r\0\x0B+-*/" );
// Do the math.
return $sum ? WC_Eval_Math::evaluate( $sum ) : 0;
}
/**
* Work out fee (shortcode).
*
* @param array $atts Attributes.
* @return string
*/
public function fee( $atts ) {
$atts = shortcode_atts(
array(
'percent' => '',
'min_fee' => '',
'max_fee' => '',
),
$atts,
'fee'
);
$calculated_fee = 0;
if ( $atts['percent'] ) {
$calculated_fee = $this->fee_cost * ( floatval( $atts['percent'] ) / 100 );
}
if ( $atts['min_fee'] && $calculated_fee < $atts['min_fee'] ) {
$calculated_fee = $atts['min_fee'];
}
if ( $atts['max_fee'] && $calculated_fee > $atts['max_fee'] ) {
$calculated_fee = $atts['max_fee'];
}
return $calculated_fee;
}
/**
* Calculate the shipping costs.
*
* @param array $package Package of items from cart.
*/
public function calculate_shipping( $package = array() ) {
$rate = array(
'id' => $this->get_rate_id(),
'label' => $this->title,
'cost' => 0,
'package' => $package,
);
// Calculate the costs.
$has_costs = false; // True when a cost is set. False if all costs are blank strings.
$cost = $this->get_option( 'cost' );
if ( '' !== $cost ) {
$has_costs = true;
$rate['cost'] = $this->evaluate_cost(
$cost,
array(
'qty' => $this->get_package_item_qty( $package ),
'cost' => $package['contents_cost'],
)
);
}
// Add shipping class costs.
$shipping_classes = WC()->shipping()->get_shipping_classes();
if ( ! empty( $shipping_classes ) ) {
$found_shipping_classes = $this->find_shipping_classes( $package );
$highest_class_cost = 0;
foreach ( $found_shipping_classes as $shipping_class => $products ) {
// Also handles BW compatibility when slugs were used instead of ids.
$shipping_class_term = get_term_by( 'slug', $shipping_class, 'product_shipping_class' );
$class_cost_string = $shipping_class_term && $shipping_class_term->term_id ? $this->get_option( 'class_cost_' . $shipping_class_term->term_id, $this->get_option( 'class_cost_' . $shipping_class, '' ) ) : $this->get_option( 'no_class_cost', '' );
if ( '' === $class_cost_string ) {
continue;
}
$has_costs = true;
$class_cost = $this->evaluate_cost(
$class_cost_string,
array(
'qty' => array_sum( wp_list_pluck( $products, 'quantity' ) ),
'cost' => array_sum( wp_list_pluck( $products, 'line_total' ) ),
)
);
if ( 'class' === $this->type ) {
$rate['cost'] += $class_cost;
} else {
$highest_class_cost = $class_cost > $highest_class_cost ? $class_cost : $highest_class_cost;
}
}
if ( 'order' === $this->type && $highest_class_cost ) {
$rate['cost'] += $highest_class_cost;
}
}
if ( $has_costs ) {
$this->add_rate( $rate );
}
/**
* Developers can add additional flat rates based on this one via this action since @version 2.4.
*
* Previously there were (overly complex) options to add additional rates however this was not user.
* friendly and goes against what Flat Rate Shipping was originally intended for.
*/
do_action( 'woocommerce_' . $this->id . '_shipping_add_rate', $this, $rate );
}
/**
* Get items in package.
*
* @param array $package Package of items from cart.
* @return int
*/
public function get_package_item_qty( $package ) {
$total_quantity = 0;
foreach ( $package['contents'] as $item_id => $values ) {
if ( $values['quantity'] > 0 && $values['data']->needs_shipping() ) {
$total_quantity += $values['quantity'];
}
}
return $total_quantity;
}
/**
* Finds and returns shipping classes and the products with said class.
*
* @param mixed $package Package of items from cart.
* @return array
*/
public function find_shipping_classes( $package ) {
$found_shipping_classes = array();
foreach ( $package['contents'] as $item_id => $values ) {
if ( $values['data']->needs_shipping() ) {
$found_class = $values['data']->get_shipping_class();
if ( ! isset( $found_shipping_classes[ $found_class ] ) ) {
$found_shipping_classes[ $found_class ] = array();
}
$found_shipping_classes[ $found_class ][ $item_id ] = $values;
}
}
return $found_shipping_classes;
}
/**
* Sanitize the cost field.
*
* @since 3.4.0
* @param string $value Unsanitized value.
* @throws Exception Last error triggered.
* @return string
*/
public function sanitize_cost( $value ) {
$value = is_null( $value ) ? '' : $value;
$value = wp_kses_post( trim( wp_unslash( $value ) ) );
$value = str_replace( array( get_woocommerce_currency_symbol(), html_entity_decode( get_woocommerce_currency_symbol() ) ), '', $value );
// Thrown an error on the front end if the evaluate_cost will fail.
$dummy_cost = $this->evaluate_cost(
$value,
array(
'cost' => 1,
'qty' => 1,
)
);
if ( false === $dummy_cost ) {
throw new Exception( WC_Eval_Math::$last_error );
}
return $value;
}
}