427 lines
14 KiB
PHP
427 lines
14 KiB
PHP
<?php
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if ( ! defined( 'ABSPATH' ) ) {
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exit; // Exit if accessed directly
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}
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/**
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* Download handler.
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*
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* Handle digital downloads.
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*
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* @class WC_Download_Handler
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* @version 2.2.0
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* @package WooCommerce/Classes
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* @category Class
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* @author WooThemes
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*/
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class WC_Download_Handler {
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/**
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* Hook in methods.
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*/
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public static function init() {
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if ( isset( $_GET['download_file'] ) && isset( $_GET['order'] ) && isset( $_GET['email'] ) ) {
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add_action( 'init', array( __CLASS__, 'download_product' ) );
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}
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add_action( 'woocommerce_download_file_redirect', array( __CLASS__, 'download_file_redirect' ), 10, 2 );
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add_action( 'woocommerce_download_file_xsendfile', array( __CLASS__, 'download_file_xsendfile' ), 10, 2 );
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add_action( 'woocommerce_download_file_force', array( __CLASS__, 'download_file_force' ), 10, 2 );
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}
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/**
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* Check if we need to download a file and check validity.
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*/
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public static function download_product() {
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$product_id = absint( $_GET['download_file'] );
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$_product = wc_get_product( $product_id );
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$download_data = self::get_download_data( array(
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'product_id' => $product_id,
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'order_key' => wc_clean( $_GET['order'] ),
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'email' => sanitize_email( str_replace( ' ', '+', $_GET['email'] ) ),
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'download_id' => wc_clean( isset( $_GET['key'] ) ? preg_replace( '/\s+/', ' ', $_GET['key'] ) : '' ),
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) );
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if ( $_product && $download_data ) {
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self::check_current_user_can_download( $download_data );
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do_action( 'woocommerce_download_product', $download_data->user_email, $download_data->order_key, $download_data->product_id, $download_data->user_id, $download_data->download_id, $download_data->order_id );
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self::count_download( $download_data );
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self::download( $_product->get_file_download_path( $download_data->download_id ), $download_data->product_id );
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} else {
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self::download_error( __( 'Invalid download link.', 'woocommerce' ) );
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}
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}
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/**
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* Get a download from the database.
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*
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* @param array $args Contains email, order key, product id and download id
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* @return object
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* @access private
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*/
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private static function get_download_data( $args = array() ) {
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global $wpdb;
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$query = "SELECT * FROM " . $wpdb->prefix . "woocommerce_downloadable_product_permissions ";
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$query .= "WHERE user_email = %s ";
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$query .= "AND order_key = %s ";
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$query .= "AND product_id = %s ";
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if ( $args['download_id'] ) {
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$query .= "AND download_id = %s ";
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}
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$query .= "ORDER BY downloads_remaining DESC";
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return $wpdb->get_row( $wpdb->prepare( $query, array( $args['email'], $args['order_key'], $args['product_id'], $args['download_id'] ) ) );
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}
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/**
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* Perform checks to see if the current user can download the file.
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* @param object $download_data
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* @access private
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*/
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private static function check_current_user_can_download( $download_data ) {
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self::check_order_is_valid( $download_data );
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self::check_downloads_remaining( $download_data );
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self::check_download_expiry( $download_data );
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self::check_download_login_required( $download_data );
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}
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/**
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* Check if an order is valid for downloading from.
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* @param array $download_data
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* @access private
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*/
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private static function check_order_is_valid( $download_data ) {
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if ( $download_data->order_id && ( $order = wc_get_order( $download_data->order_id ) ) && ! $order->is_download_permitted() ) {
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self::download_error( __( 'Invalid order.', 'woocommerce' ), '', 403 );
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}
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}
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/**
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* Check if there are downloads remaining.
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* @param array $download_data
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* @access private
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*/
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private static function check_downloads_remaining( $download_data ) {
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if ( '0' == $download_data->downloads_remaining ) {
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self::download_error( __( 'Sorry, you have reached your download limit for this file', 'woocommerce' ), '', 403 );
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}
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}
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/**
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* Check if the download has expired.
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* @param array $download_data
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* @access private
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*/
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private static function check_download_expiry( $download_data ) {
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if ( $download_data->access_expires > 0 && strtotime( $download_data->access_expires ) < strtotime( 'midnight', current_time( 'timestamp' ) ) ) {
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self::download_error( __( 'Sorry, this download has expired', 'woocommerce' ), '', 403 );
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}
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}
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/**
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* Check if a download requires the user to login first.
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* @param array $download_data
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* @access private
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*/
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private static function check_download_login_required( $download_data ) {
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if ( $download_data->user_id && 'yes' === get_option( 'woocommerce_downloads_require_login' ) ) {
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if ( ! is_user_logged_in() ) {
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if ( wc_get_page_id( 'myaccount' ) ) {
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wp_safe_redirect( add_query_arg( 'wc_error', urlencode( __( 'You must be logged in to download files.', 'woocommerce' ) ), wc_get_page_permalink( 'myaccount' ) ) );
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exit;
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} else {
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self::download_error( __( 'You must be logged in to download files.', 'woocommerce' ) . ' <a href="' . esc_url( wp_login_url( wc_get_page_permalink( 'myaccount' ) ) ) . '" class="wc-forward">' . __( 'Login', 'woocommerce' ) . '</a>', __( 'Log in to Download Files', 'woocommerce' ), 403 );
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}
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} elseif ( ! current_user_can( 'download_file', $download_data ) ) {
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self::download_error( __( 'This is not your download link.', 'woocommerce' ), '', 403 );
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}
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}
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}
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/**
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* Log the download + increase counts.
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* @param object $download_data
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*/
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public static function count_download( $download_data ) {
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global $wpdb;
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$wpdb->update(
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$wpdb->prefix . 'woocommerce_downloadable_product_permissions',
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array(
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'download_count' => $download_data->download_count + 1,
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'downloads_remaining' => $download_data->downloads_remaining > 0 ? $download_data->downloads_remaining - 1 : $download_data->downloads_remaining,
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),
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array(
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'permission_id' => absint( $download_data->permission_id ),
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),
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array( '%d', '%s' ),
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array( '%d' )
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);
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}
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/**
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* Download a file - hook into init function.
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* @param string $file_path URL to file
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* @param integer $product_id of the product being downloaded
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*/
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public static function download( $file_path, $product_id ) {
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if ( ! $file_path ) {
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self::download_error( __( 'No file defined', 'woocommerce' ) );
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}
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$filename = basename( $file_path );
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if ( strstr( $filename, '?' ) ) {
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$filename = current( explode( '?', $filename ) );
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}
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$filename = apply_filters( 'woocommerce_file_download_filename', $filename, $product_id );
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$file_download_method = apply_filters( 'woocommerce_file_download_method', get_option( 'woocommerce_file_download_method', 'force' ), $product_id );
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// Add action to prevent issues in IE
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add_action( 'nocache_headers', array( __CLASS__, 'ie_nocache_headers_fix' ) );
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// Trigger download via one of the methods
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do_action( 'woocommerce_download_file_' . $file_download_method, $file_path, $filename );
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}
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/**
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* Redirect to a file to start the download.
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* @param string $file_path
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* @param string $filename
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*/
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public static function download_file_redirect( $file_path, $filename = '' ) {
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header( 'Location: ' . $file_path );
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exit;
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}
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/**
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* Parse file path and see if its remote or local.
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* @param string $file_path
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* @return array
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*/
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public static function parse_file_path( $file_path ) {
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$wp_uploads = wp_upload_dir();
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$wp_uploads_dir = $wp_uploads['basedir'];
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$wp_uploads_url = $wp_uploads['baseurl'];
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// Replace uploads dir, site url etc with absolute counterparts if we can
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$replacements = array(
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$wp_uploads_url => $wp_uploads_dir,
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network_site_url( '/', 'https' ) => ABSPATH,
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network_site_url( '/', 'http' ) => ABSPATH,
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site_url( '/', 'https' ) => ABSPATH,
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site_url( '/', 'http' ) => ABSPATH,
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);
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$file_path = str_replace( array_keys( $replacements ), array_values( $replacements ), $file_path );
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$parsed_file_path = parse_url( $file_path );
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$remote_file = true;
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// See if path needs an abspath prepended to work
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if ( file_exists( ABSPATH . $file_path ) ) {
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$remote_file = false;
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$file_path = ABSPATH . $file_path;
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// Check if we have an absolute path
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} elseif ( ( ! isset( $parsed_file_path['scheme'] ) || ! in_array( $parsed_file_path['scheme'], array( 'http', 'https', 'ftp' ) ) ) && isset( $parsed_file_path['path'] ) && file_exists( $parsed_file_path['path'] ) ) {
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$remote_file = false;
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$file_path = $parsed_file_path['path'];
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}
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return array(
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'remote_file' => $remote_file,
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'file_path' => $file_path,
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);
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}
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/**
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* Download a file using X-Sendfile, X-Lighttpd-Sendfile, or X-Accel-Redirect if available.
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* @param string $file_path
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* @param string $filename
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*/
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public static function download_file_xsendfile( $file_path, $filename ) {
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$parsed_file_path = self::parse_file_path( $file_path );
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if ( function_exists( 'apache_get_modules' ) && in_array( 'mod_xsendfile', apache_get_modules() ) ) {
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self::download_headers( $parsed_file_path['file_path'], $filename );
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header( "X-Sendfile: " . $parsed_file_path['file_path'] );
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exit;
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} elseif ( stristr( getenv( 'SERVER_SOFTWARE' ), 'lighttpd' ) ) {
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self::download_headers( $parsed_file_path['file_path'], $filename );
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header( "X-Lighttpd-Sendfile: " . $parsed_file_path['file_path'] );
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exit;
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} elseif ( stristr( getenv( 'SERVER_SOFTWARE' ), 'nginx' ) || stristr( getenv( 'SERVER_SOFTWARE' ), 'cherokee' ) ) {
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self::download_headers( $parsed_file_path['file_path'], $filename );
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$xsendfile_path = trim( preg_replace( '`^' . str_replace( '\\', '/', getcwd() ) . '`', '', $parsed_file_path['file_path'] ), '/' );
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header( "X-Accel-Redirect: /$xsendfile_path" );
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exit;
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}
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// Fallback
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self::download_file_force( $file_path, $filename );
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}
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/**
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* Force download - this is the default method.
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* @param string $file_path
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* @param string $filename
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*/
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public static function download_file_force( $file_path, $filename ) {
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$parsed_file_path = self::parse_file_path( $file_path );
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self::download_headers( $parsed_file_path['file_path'], $filename );
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if ( ! self::readfile_chunked( $parsed_file_path['file_path'] ) ) {
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if ( $parsed_file_path['remote_file'] ) {
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self::download_file_redirect( $file_path );
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} else {
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self::download_error( __( 'File not found', 'woocommerce' ) );
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}
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}
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exit;
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}
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/**
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* Get content type of a download.
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* @param string $file_path
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* @return string
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* @access private
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*/
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private static function get_download_content_type( $file_path ) {
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$file_extension = strtolower( substr( strrchr( $file_path, "." ), 1 ) );
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$ctype = "application/force-download";
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foreach ( get_allowed_mime_types() as $mime => $type ) {
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$mimes = explode( '|', $mime );
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if ( in_array( $file_extension, $mimes ) ) {
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$ctype = $type;
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break;
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}
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}
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return $ctype;
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}
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/**
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* Set headers for the download.
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* @param string $file_path
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* @param string $filename
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* @access private
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*/
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private static function download_headers( $file_path, $filename ) {
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self::check_server_config();
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self::clean_buffers();
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nocache_headers();
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header( "X-Robots-Tag: noindex, nofollow", true );
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header( "Content-Type: " . self::get_download_content_type( $file_path ) );
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header( "Content-Description: File Transfer" );
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header( "Content-Disposition: attachment; filename=\"" . $filename . "\";" );
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header( "Content-Transfer-Encoding: binary" );
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if ( $size = @filesize( $file_path ) ) {
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header( "Content-Length: " . $size );
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}
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}
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/**
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* Check and set certain server config variables to ensure downloads work as intended.
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*/
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private static function check_server_config() {
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wc_set_time_limit( 0 );
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if ( function_exists( 'get_magic_quotes_runtime' ) && get_magic_quotes_runtime() && version_compare( phpversion(), '5.4', '<' ) ) {
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set_magic_quotes_runtime( 0 );
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}
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if ( function_exists( 'apache_setenv' ) ) {
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@apache_setenv( 'no-gzip', 1 );
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}
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@ini_set( 'zlib.output_compression', 'Off' );
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@session_write_close();
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}
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/**
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* Clean all output buffers.
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*
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* Can prevent errors, for example: transfer closed with 3 bytes remaining to read.
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*
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* @access private
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*/
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private static function clean_buffers() {
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if ( ob_get_level() ) {
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$levels = ob_get_level();
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for ( $i = 0; $i < $levels; $i++ ) {
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@ob_end_clean();
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}
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} else {
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@ob_end_clean();
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}
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}
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/**
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* readfile_chunked.
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*
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* Reads file in chunks so big downloads are possible without changing PHP.INI - http://codeigniter.com/wiki/Download_helper_for_large_files/.
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*
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* @param string $file
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* @return bool Success or fail
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*/
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public static function readfile_chunked( $file ) {
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$chunksize = 1024 * 1024;
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$handle = @fopen( $file, 'r' );
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if ( false === $handle ) {
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return false;
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}
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while ( ! @feof( $handle ) ) {
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echo @fread( $handle, $chunksize );
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if ( ob_get_length() ) {
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ob_flush();
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flush();
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}
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}
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return @fclose( $handle );
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}
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/**
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* Filter headers for IE to fix issues over SSL.
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*
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* IE bug prevents download via SSL when Cache Control and Pragma no-cache headers set.
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*
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* @param array $headers
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* @return array
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*/
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public static function ie_nocache_headers_fix( $headers ) {
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if ( is_ssl() && ! empty( $GLOBALS['is_IE'] ) ) {
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$headers['Cache-Control'] = 'private';
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unset( $headers['Pragma'] );
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}
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return $headers;
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}
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/**
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* Die with an error message if the download fails.
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* @param string $message
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* @param string $title
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* @param integer $status
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* @access private
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*/
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private static function download_error( $message, $title = '', $status = 404 ) {
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if ( ! strstr( $message, '<a ' ) ) {
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$message .= ' <a href="' . esc_url( wc_get_page_permalink( 'shop' ) ) . '" class="wc-forward">' . __( 'Go to shop', 'woocommerce' ) . '</a>';
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}
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wp_die( $message, $title, array( 'response' => $status ) );
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}
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}
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WC_Download_Handler::init();
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