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+<?php
+/**
+ * Upgrade API: File_Upload_Upgrader class
+ *
+ * @package WordPress
+ * @subpackage Upgrader
+ * @since 4.6.0
+ */
+
+/**
+ * Core class used for handling file uploads.
+ *
+ * This class handles the upload process and passes it as if it's a local file
+ * to the Upgrade/Installer functions.
+ *
+ * @since 2.8.0
+ * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
+ */
+class File_Upload_Upgrader {
+
+ /**
+ * The full path to the file package.
+ *
+ * @since 2.8.0
+ * @var string $package
+ */
+ public $package;
+
+ /**
+ * The name of the file.
+ *
+ * @since 2.8.0
+ * @var string $filename
+ */
+ public $filename;
+
+ /**
+ * The ID of the attachment post for this file.
+ *
+ * @since 3.3.0
+ * @var int $id
+ */
+ public $id = 0;
+
+ /**
+ * Construct the upgrader for a form.
+ *
+ * @since 2.8.0
+ *
+ * @param string $form The name of the form the file was uploaded from.
+ * @param string $urlholder The name of the `GET` parameter that holds the filename.
+ */
+ public function __construct( $form, $urlholder ) {
+
+ if ( empty( $_FILES[ $form ]['name'] ) && empty( $_GET[ $urlholder ] ) ) {
+ wp_die( __( 'Please select a file' ) );
+ }
+
+ //Handle a newly uploaded file, Else assume it's already been uploaded
+ if ( ! empty( $_FILES ) ) {
+ $overrides = array(
+ 'test_form' => false,
+ 'test_type' => false,
+ );
+ $file = wp_handle_upload( $_FILES[ $form ], $overrides );
+
+ if ( isset( $file['error'] ) ) {
+ wp_die( $file['error'] );
+ }
+
+ $this->filename = $_FILES[ $form ]['name'];
+ $this->package = $file['file'];
+
+ // Construct the object array
+ $object = array(
+ 'post_title' => $this->filename,
+ 'post_content' => $file['url'],
+ 'post_mime_type' => $file['type'],
+ 'guid' => $file['url'],
+ 'context' => 'upgrader',
+ 'post_status' => 'private',
+ );
+
+ // Save the data.
+ $this->id = wp_insert_attachment( $object, $file['file'] );
+
+ // Schedule a cleanup for 2 hours from now in case of failed installation.
+ wp_schedule_single_event( time() + 2 * HOUR_IN_SECONDS, 'upgrader_scheduled_cleanup', array( $this->id ) );
+
+ } elseif ( is_numeric( $_GET[ $urlholder ] ) ) {
+ // Numeric Package = previously uploaded file, see above.
+ $this->id = (int) $_GET[ $urlholder ];
+ $attachment = get_post( $this->id );
+ if ( empty( $attachment ) ) {
+ wp_die( __( 'Please select a file' ) );
+ }
+
+ $this->filename = $attachment->post_title;
+ $this->package = get_attached_file( $attachment->ID );
+ } else {
+ // Else, It's set to something, Back compat for plugins using the old (pre-3.3) File_Uploader handler.
+ if ( ! ( ( $uploads = wp_upload_dir() ) && false === $uploads['error'] ) ) {
+ wp_die( $uploads['error'] );
+ }
+
+ $this->filename = sanitize_file_name( $_GET[ $urlholder ] );
+ $this->package = $uploads['basedir'] . '/' . $this->filename;
+
+ if ( 0 !== strpos( realpath( $this->package ), realpath( $uploads['basedir'] ) ) ) {
+ wp_die( __( 'Please select a file' ) );
+ }
+ }
+ }
+
+ /**
+ * Delete the attachment/uploaded file.
+ *
+ * @since 3.2.2
+ *
+ * @return bool Whether the cleanup was successful.
+ */
+ public function cleanup() {
+ if ( $this->id ) {
+ wp_delete_attachment( $this->id );
+
+ } elseif ( file_exists( $this->package ) ) {
+ return @unlink( $this->package );
+ }
+
+ return true;
+ }
+}