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Edit File: class-wc-meta-box-order-downloads.php

<?php
/**
 * Order Downloads
 *
 * @package     WooCommerce\Admin\Meta Boxes
 * @version     2.1.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

/**
 * WC_Meta_Box_Order_Downloads Class.
 */
class WC_Meta_Box_Order_Downloads {

/**
	 * Output the metabox.
	 *
	 * @param WC_Order|WP_Post $post Post or order object.
	 */
	public static function output( $post ) {
		if ( $post instanceof WC_Order ) {
			$order_id = $post->get_id();
		} else {
			$order_id = $post->ID;
		}
		?>
		<div class="order_download_permissions wc-metaboxes-wrapper">

<div class="wc-metaboxes">
				<?php
				$data_store           = WC_Data_Store::load( 'customer-download' );
				$download_permissions = array();
				if ( 0 !== $order_id ) {
					$download_permissions = $data_store->get_downloads(
						array(
							'order_id' => $order_id,
							'orderby'  => 'product_id',
						)
					);
				}

$product      = null;
				$loop         = 0;
				$file_counter = 1;

if ( $download_permissions && count( $download_permissions ) > 0 ) {
					foreach ( $download_permissions as $download ) {
						if ( ! $product || $product->get_id() !== $download->get_product_id() ) {
							$product      = wc_get_product( $download->get_product_id() );
							$file_counter = 1;
						}

// don't show permissions to files that have since been removed.
						if ( ! $product || ! $product->exists() || ! $product->has_file( $download->get_download_id() ) ) {
							continue;
						}

// Show file title instead of count if set.
						$file       = $product->get_file( $download->get_download_id() );
						// translators: file name.
						$file_count = isset( $file['name'] ) ? $file['name'] : sprintf( __( 'File %d', 'woocommerce' ), $file_counter );

include __DIR__ . '/views/html-order-download-permission.php';

$loop++;
						$file_counter++;
					}
				}
				?>
			</div>

<div class="toolbar">
				<p class="buttons">
					<select id="grant_access_id" class="wc-product-search" name="grant_access_id[]" multiple="multiple" style="width: 400px;" data-placeholder="<?php esc_attr_e( 'Search for a downloadable product&hellip;', 'woocommerce' ); ?>" data-action="woocommerce_json_search_downloadable_products_and_variations"></select>
					<button type="button" class="button grant_access">
						<?php esc_html_e( 'Grant access', 'woocommerce' ); ?>
					</button>
				</p>
				<div class="clear"></div>
			</div>

</div>
		<?php
	}

/**
	 * Save meta box data.
	 *
	 * @param int     $post_id Post ID.
	 * @param WP_Post $post Post object.
	 */
	public static function save( $post_id, $post ) {
		if ( isset( $_POST['permission_id'] ) ) {
			$permission_ids      = $_POST['permission_id'];
			$downloads_remaining = $_POST['downloads_remaining'];
			$access_expires      = $_POST['access_expires'];
			$max                 = max( array_keys( $permission_ids ) );

for ( $i = 0; $i <= $max; $i ++ ) {
				if ( ! isset( $permission_ids[ $i ] ) ) {
					continue;
				}
				$download = new WC_Customer_Download( $permission_ids[ $i ] );
				$download->set_downloads_remaining( wc_clean( $downloads_remaining[ $i ] ) );
				$download->set_access_expires( array_key_exists( $i, $access_expires ) && '' !== $access_expires[ $i ] ? strtotime( $access_expires[ $i ] ) : '' );
				$download->save();
			}
		}
	}
}

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