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<?php |
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/** |
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* WooCommerce Tax (automated taxes) integration. |
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* |
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* @package WCPOS\WooCommercePOS |
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*/ |
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|
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namespace WCPOS\WooCommercePOS\Integrations; |
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|
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use WC_Abstract_Order; |
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use WC_Order; |
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use WP_REST_Request; |
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|
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/** |
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* Keep WooCommerce Tax from restoring stale tax lines onto open POS orders. |
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* |
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* WooCommerce Tax (wp.org slug `woocommerce-services`, formerly WooCommerce |
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* Shipping & Tax) 3.6.8 and later snapshots an order's tax lines on |
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* `woocommerce_order_before_calculate_taxes` and writes them back on |
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* `woocommerce_order_after_calculate_totals`, rebasing the order total on the |
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* old tax. Its premise is that a placed order's tax is a record of what was |
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* charged. An open till order is not: every WCPOS save of a `pos-open` order can |
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* change the line items, and WooCommerce's REST controller recalculates totals |
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* for them. With the snapshot restored, the server answers with the previous |
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* save's tax while the POS has computed tax for the current lines, and the |
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* client shows the totals-disagree banner. See |
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* https://github.com/wcpos/woocommerce-pos/issues/1896. |
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* |
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* The plugin primes TaxJar rates only from the cart and wp-admin, while POS |
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* writes arrive through REST. Prime rates for the current order before WooCommerce |
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* matches them, so POS tax does not depend on an earlier checkout at that address. |
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* |
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* The plugin has no filter and no status gate, and its integration object is |
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* held privately by its loader, so its callbacks are located on the hooks |
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* themselves. When a WCPOS request recalculates an order that is open, or that |
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* the request is putting back into an open status, both of the plugin's |
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* callbacks are unhooked for that one recalculation and hooked again as soon as |
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* it finishes. Paid orders and non-POS requests keep the plugin's behaviour. |
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*/ |
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class WooCommerce_Tax { |
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/** |
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* The plugin's integration class. |
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*/ |
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const TAXJAR_CLASS = 'WC_Connect_TaxJar_Integration'; |
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|
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/** |
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* Hook the plugin snapshots on. |
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*/ |
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const BEFORE_HOOK = 'woocommerce_order_before_calculate_taxes'; |
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|
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/** |
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* Hook the plugin restores on, and where its callbacks are hooked again. |
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*/ |
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const AFTER_HOOK = 'woocommerce_order_after_calculate_totals'; |
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|
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/** |
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* Priority the callbacks are hooked again at on AFTER_HOOK. |
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* |
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* WP_Hook runs a callback added during dispatch if its priority has not been |
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* passed yet. Re-adding the plugin's restore at 10 from priority 9 would run |
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* it in the same pass, and a snapshot left over from an earlier bare |
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* calculate_taxes() on the same order would be written over the fresh tax. |
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* Re-adding from the last priority keeps it for the next recalculation. |
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*/ |
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const RESUME_PRIORITY = PHP_INT_MAX; |
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|
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/** |
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* The plugin's callbacks, by hook. Both are suspended together so a snapshot |
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* taken by the first can never be written back by the second. |
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* |
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* @var array<string, string> |
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*/ |
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const PLUGIN_CALLBACKS = array( |
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self::BEFORE_HOOK => 'preserve_order_taxes_on_recalculation', |
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self::AFTER_HOOK => 'restore_order_taxes_after_recalculation', |
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); |
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|
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/** |
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* Statuses whose tax is not yet a record of what was charged. |
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* |
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* @var string[] |
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*/ |
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const OPEN_STATUSES = array( 'pending', 'pos-open', 'pos-partial' ); |
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|
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/** |
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* Plugin callbacks removed for the recalculation in progress. |
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* |
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* @var array<int, array{hook: string, callback: array, priority: int, accepted_args: int}> |
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*/ |
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private $suspended = array(); |
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|
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/** |
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* The order a WCPOS REST write is about to save, and the status it asked for. |
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* |
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* WooCommerce's REST controller recalculates totals before it applies the |
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* requested status, so a request that reopens a paid order and changes its |
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* lines recalculates while the persisted status is still paid. |
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* |
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* @var array{order: WC_Abstract_Order, status: string}|null |
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*/ |
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private $requested = null; |
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|
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/** |
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* Constructor. |
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* |
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* Suspend at priority 9, before the plugin's snapshot callback at 10; resume |
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* from the last priority so nothing re-added runs in the same pass. |
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*/ |
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public function __construct() { |
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add_filter( 'woocommerce_rest_pre_insert_shop_order_object', array( $this, 'note_requested_status' ), 10, 2 ); |
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add_action( self::BEFORE_HOOK, array( $this, 'prime_tax_rates' ), 8, 2 ); |
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add_action( self::BEFORE_HOOK, array( $this, 'suspend_tax_preservation' ), 9, 2 ); |
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add_action( self::AFTER_HOOK, array( $this, 'resume_tax_preservation' ), self::RESUME_PRIORITY ); |
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} |
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|
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/** |
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* Remember the status a REST write asked for, for the recalculation it triggers. |
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* |
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* @param mixed $order The order about to be saved. |
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* @param WP_REST_Request|null $request The request. |
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* |
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* @return mixed The order, unchanged. |
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*/ |
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public function note_requested_status( $order, $request = null ) { |
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$this->requested = null; |
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if ( $order instanceof WC_Abstract_Order && $request instanceof WP_REST_Request ) { |
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$this->requested = array( |
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'order' => $order, |
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'status' => (string) $request->get_param( 'status' ), |
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); |
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} |
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|
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return $order; |
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} |
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|
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/** |
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* Prime the plugin's rates for the order before WooCommerce matches them. |
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* |
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* Mirrors the request the plugin's protected get_backend_line_items() builds |
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* (woocommerce-services 3.6.14), with one deliberate difference: items |
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* WooCommerce will not tax are left out. The plugin sends them as exempt and |
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* skips their 0% breakdown line through a private list only its own builders |
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* fill; without that list the 0% would be written over the shared rate row |
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* for the item's tax class. Their rates are never needed here. |
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* |
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* @param array $args Calculation arguments. Unused. |
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* @param WC_Abstract_Order|null $order The order being recalculated. |
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*/ |
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public function prime_tax_rates( $args = array(), $order = null ): void { |
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// A leftover suspension would hide the plugin's callbacks from the lookup below. |
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$this->restore_suspended(); |
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|
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if ( ! $order instanceof WC_Abstract_Order || ! \wcpos_request() || ! $this->is_open_pos_order( $order ) ) { |
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return; |
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} |
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$callbacks = $this->find_plugin_callbacks( self::BEFORE_HOOK, self::PLUGIN_CALLBACKS[ self::BEFORE_HOOK ] ); |
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if ( empty( $callbacks ) ) { |
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return; |
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} |
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$taxjar = $callbacks[0]['callback'][0]; |
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|
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// get_taxable_location() is public since WooCommerce 7.6. Older stores keep |
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// today's behaviour rather than a warning on every save. |
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if ( version_compare( WC_VERSION, '7.6.0', '<' ) ) { |
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return; |
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} |
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|
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try { |
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$location = $order->get_taxable_location(); |
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$options = array( |
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'to_country' => $location['country'] ?? '', |
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'to_state' => $location['state'] ?? '', |
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'to_zip' => $location['postcode'] ?? '', |
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'to_city' => $location['city'] ?? '', |
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'to_street' => $this->street_for_location( $order, $location ), |
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'shipping_amount' => $order->get_shipping_total(), |
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'line_items' => array(), |
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); |
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foreach ( $order->get_items( 'line_item' ) as $item ) { |
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if ( 'taxable' !== $item->get_tax_status() ) { |
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continue; |
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} |
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$quantity = $item->get_quantity(); |
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$unit_price = empty( $quantity ) ? $item->get_subtotal() : wc_format_decimal( $item->get_subtotal() / $quantity ); |
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if ( empty( $unit_price ) ) { |
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continue; |
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} |
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$tax_class = explode( '-', $item->get_tax_class() ); |
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$options['line_items'][] = array( |
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'id' => (string) ( $item->get_variation_id() ? $item->get_variation_id() : $item->get_product_id() ), |
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'quantity' => $quantity, |
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'unit_price' => $unit_price, |
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'discount' => wc_format_decimal( $item->get_subtotal() - $item->get_total() ), |
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'product_tax_code' => isset( $tax_class[1] ) && is_numeric( $tax_class[1] ) ? $tax_class[1] : '', |
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); |
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} |
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if ( empty( $options['line_items'] ) && empty( (float) $options['shipping_amount'] ) ) { |
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return; |
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} |
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// WooCommerce does not initialise the customer on REST requests, and the |
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// plugin reads it for its VAT-exemption check. |
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if ( ! WC()->customer instanceof \WC_Customer ) { |
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wc_load_cart(); |
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} |
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if ( false === $taxjar->calculate_tax( $options ) ) { |
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\WCPOS\WooCommercePOS\Logger::log( 'WooCommerce Tax returned no rates for the POS order', array( 'order_id' => $order->get_id() ) ); |
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} |
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} catch ( \Throwable $e ) { |
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\WCPOS\WooCommercePOS\Logger::warning( |
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'WooCommerce Tax rate priming failed', |
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array( |
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'order_id' => $order->get_id(), |
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'error' => $e->getMessage(), |
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) |
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); |
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} |
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} |
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|
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/** |
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* Unhook the plugin's callbacks for an open POS order. |
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* |
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* @param array $args Args passed to calculate_taxes(). Unused. |
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* @param WC_Abstract_Order|null $order The order being recalculated. |
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*/ |
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public function suspend_tax_preservation( $args = array(), $order = null ): void { |
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// A recalculation that never reached AFTER_HOOK (a direct calculate_taxes() |
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// call) leaves the callbacks suspended. Hook them back before deciding |
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// about this order, so a suspension never outlives one recalculation. |
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$this->restore_suspended(); |
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|
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if ( ! $order instanceof WC_Abstract_Order || ! $this->is_open_pos_order( $order ) || ! \wcpos_request() ) { |
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return; |
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} |
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|
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foreach ( self::PLUGIN_CALLBACKS as $hook => $method ) { |
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foreach ( $this->find_plugin_callbacks( $hook, $method ) as $entry ) { |
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remove_action( $hook, $entry['callback'], $entry['priority'] ); |
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$this->suspended[] = $entry; |
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} |
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} |
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} |
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|
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/** |
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* Hook the plugin's callbacks again once the recalculation is done. |
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*/ |
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public function resume_tax_preservation(): void { |
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$this->restore_suspended(); |
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} |
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|
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/** |
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* Re-add every suspended callback where it was. |
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*/ |
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private function restore_suspended(): void { |
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foreach ( $this->suspended as $entry ) { |
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add_action( $entry['hook'], $entry['callback'], $entry['priority'], $entry['accepted_args'] ); |
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} |
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$this->suspended = array(); |
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} |
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|
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/** |
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* Whether the order is, or is being put back to, still being built up at the till. |
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* |
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* @param WC_Abstract_Order $order The order. |
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* |
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* @return bool |
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*/ |
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private function is_open_pos_order( WC_Abstract_Order $order ): bool { |
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if ( \in_array( $order->get_status(), self::OPEN_STATUSES, true ) ) { |
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return true; |
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} |
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|
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return null !== $this->requested |
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&& $this->requested['order'] === $order |
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&& \in_array( $this->requested['status'], self::OPEN_STATUSES, true ); |
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} |
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|
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/** |
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* The street line that belongs to the address WooCommerce is taxing. |
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* |
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* The declared basis (the POS meta, else WooCommerce's setting) is tried first |
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* so two addresses that share a country, state, postcode and city are told |
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* apart; the tuple check keeps the street consistent with the location that |
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* was actually resolved, which a filter may have changed. |
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* |
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* @param WC_Abstract_Order $order The order. |
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* @param array $location Country, state, postcode and city from get_taxable_location(). |
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* |
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* @return string |
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*/ |
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private function street_for_location( WC_Abstract_Order $order, array $location ): string { |
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if ( $order instanceof WC_Order ) { |
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$basis = (string) $order->get_meta( '_woocommerce_pos_tax_based_on' ); |
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if ( '' === $basis ) { |
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$basis = (string) get_option( 'woocommerce_tax_based_on', 'shipping' ); |
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} |
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$candidates = array( |
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'billing' => array( $order->get_billing_address_1(), array( $order->get_billing_country(), $order->get_billing_state(), $order->get_billing_postcode(), $order->get_billing_city() ) ), |
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'shipping' => array( $order->get_shipping_address_1(), array( $order->get_shipping_country(), $order->get_shipping_state(), $order->get_shipping_postcode(), $order->get_shipping_city() ) ), |
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); |
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if ( isset( $candidates[ $basis ] ) ) { |
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$candidates = array( $basis => $candidates[ $basis ] ) + $candidates; |
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} |
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$taxed = array( $location['country'] ?? '', $location['state'] ?? '', $location['postcode'] ?? '', $location['city'] ?? '' ); |
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foreach ( $candidates as $candidate ) { |
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if ( $candidate[1] === $taxed ) { |
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return (string) $candidate[0]; |
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} |
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} |
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} |
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|
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return (string) WC()->countries->get_base_address(); |
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} |
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|
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/** |
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* Locate the plugin's callback for a method on a hook, at whatever priority. |
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* |
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* @param string $hook The hook. |
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* @param string $method The plugin method name. |
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* |
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* @return array<int, array{hook: string, callback: array, priority: int, accepted_args: int}> |
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*/ |
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private function find_plugin_callbacks( string $hook, string $method ): array { |
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global $wp_filter; |
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$found = array(); |
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if ( ! isset( $wp_filter[ $hook ] ) ) { |
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return $found; |
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} |
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|
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foreach ( $wp_filter[ $hook ]->callbacks as $priority => $callbacks ) { |
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foreach ( $callbacks as $entry ) { |
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$callback = $entry['function']; |
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if ( \is_array( $callback ) |
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&& isset( $callback[0], $callback[1] ) |
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&& \is_object( $callback[0] ) |
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&& is_a( $callback[0], self::TAXJAR_CLASS ) |
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&& $method === $callback[1] ) { |
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$found[] = array( |
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'hook' => $hook, |
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'callback' => $callback, |
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'priority' => (int) $priority, |
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'accepted_args' => (int) $entry['accepted_args'], |
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); |
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} |
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} |
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} |
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|
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return $found; |
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} |
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} |
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|
