Fixes in the receipts rendering engine (#47300)

* Fix permission check in RestApiControllerBase

Extra arguments were being passed incorrectly to current_user_can,
causing wrong authentication failures in some cases (e.g.
when hitting the endpoints in a wp.com site via Jetpack tunneling).

* Fix get_order_data in ReceiptRenderingEngine

A fatal error was being thrown when one of the products referenced
in the order did no longer exist.

plugins/woocommerce/changelog/pr-47300

@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Fixes regarding authentication and non-existing products in the receipts rendering engine

plugins/woocommerce/src/Internal/ReceiptRendering/ReceiptRenderingEngine.php

@@ -272,10 +272,14 @@ private function get_order_data( WC_Order $order ): array {
 		$line_items      = $order->get_items( 'line_item' );
 		foreach ( $line_items as $line_item ) {
 			$line_item_product = $line_item->get_product();
-			$line_item_title   =
-				( $line_item_product instanceof \WC_Product_Variation ) ?
-					( wc_get_product( $line_item_product->get_parent_id() )->get_name() ) . '. ' . $line_item_product->get_attribute_summary() :
-					$line_item_product->get_name();
+			if ( false === $line_item_product ) {
+				$line_item_title = $line_item->get_name();
+			} else {
+				$line_item_title =
+					( $line_item_product instanceof \WC_Product_Variation ) ?
+						( wc_get_product( $line_item_product->get_parent_id() )->get_name() ) . '. ' . $line_item_product->get_attribute_summary() :
+						$line_item_product->get_name();
+			}
 			$line_items_info[] = array(
 				'type'     => 'product',
 				'item'     => $line_item,

plugins/woocommerce/src/Internal/RestApiControllerBase.php

@@ -202,7 +202,7 @@ protected function internal_wp_error( Exception $exception ): WP_Error {
 	 * @return bool|WP_Error True if the current user has the capability, otherwise an "Unauthorized" error or False if no error is available for the request method.
 	 */
 	protected function check_permission( WP_REST_Request $request, string $required_capability_name, ...$extra_args ) {
-		if ( current_user_can( $required_capability_name, $extra_args ) ) {
+		if ( current_user_can( $required_capability_name, ...$extra_args ) ) {
 			return true;
 		}