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📄 admin-filters.php(7.85 KB)
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📄 ajax-actions.php(148.33 KB)
📄 bookmark.php(11.45 KB)
📄 class-automatic-upgrader-skin.php(3.58 KB)
📄 class-bulk-plugin-upgrader-skin.php(2.53 KB)
📄 class-bulk-theme-upgrader-skin.php(2.6 KB)
📄 class-bulk-upgrader-skin.php(6.59 KB)
📄 class-core-upgrader.php(14.83 KB)
📄 class-custom-background.php(21.18 KB)
📄 class-custom-image-header.php(48.13 KB)
📄 class-file-upload-upgrader.php(4.07 KB)
📄 class-ftp-pure.php(5.3 KB)
📄 class-ftp-sockets.php(8.28 KB)
📄 class-ftp.php(26.73 KB)
📄 class-language-pack-upgrader-skin.php(2.8 KB)
📄 class-language-pack-upgrader.php(15.2 KB)
📄 class-pclzip.php(192.08 KB)
📄 class-plugin-installer-skin.php(11.77 KB)
📄 class-plugin-upgrader-skin.php(3.2 KB)
📄 class-plugin-upgrader.php(22.89 KB)
📄 class-theme-installer-skin.php(12.77 KB)
📄 class-theme-upgrader-skin.php(4.08 KB)
📄 class-theme-upgrader.php(26.27 KB)
📄 class-walker-category-checklist.php(4.97 KB)
📄 class-walker-nav-menu-checklist.php(5.57 KB)
📄 class-walker-nav-menu-edit.php(13.93 KB)
📄 class-wp-ajax-upgrader-skin.php(4.09 KB)
📄 class-wp-application-passwords-list-table.php(6.79 KB)
📄 class-wp-automatic-updater.php(60.45 KB)
📄 class-wp-comments-list-table.php(32.4 KB)
📄 class-wp-community-events.php(18.24 KB)
📄 class-wp-debug-data.php(66.01 KB)
📄 class-wp-filesystem-base.php(23.84 KB)
📄 class-wp-filesystem-direct.php(17.72 KB)
📄 class-wp-filesystem-ftpext.php(22.71 KB)
📄 class-wp-filesystem-ftpsockets.php(18.05 KB)
📄 class-wp-filesystem-ssh2.php(22.76 KB)
📄 class-wp-importer.php(7.34 KB)
📄 class-wp-internal-pointers.php(4.51 KB)
📄 class-wp-links-list-table.php(9.02 KB)
📄 class-wp-list-table-compat.php(1.46 KB)
📄 class-wp-list-table.php(51.76 KB)
📄 class-wp-media-list-table.php(25.29 KB)
📄 class-wp-ms-sites-list-table.php(21.61 KB)
📄 class-wp-ms-themes-list-table.php(27.77 KB)
📄 class-wp-ms-users-list-table.php(15.35 KB)
📄 class-wp-plugin-install-list-table.php(24.54 KB)
📄 class-wp-plugins-list-table.php(56.44 KB)
📄 class-wp-post-comments-list-table.php(1.42 KB)
📄 class-wp-posts-list-table.php(63.66 KB)
📄 class-wp-privacy-data-export-requests-list-table.php(5.43 KB)
📄 class-wp-privacy-data-removal-requests-list-table.php(5.58 KB)
📄 class-wp-privacy-policy-content.php(31.9 KB)
📄 class-wp-privacy-requests-table.php(14.44 KB)
📄 class-wp-screen.php(36.47 KB)
📄 class-wp-site-health-auto-updates.php(14 KB)
📄 class-wp-site-health.php(121.89 KB)
📄 class-wp-site-icon.php(6.26 KB)
📄 class-wp-terms-list-table.php(20.73 KB)
📄 class-wp-theme-install-list-table.php(15.23 KB)
📄 class-wp-themes-list-table.php(10.14 KB)
📄 class-wp-upgrader-skin.php(6.94 KB)
📄 class-wp-upgrader-skins.php(1.44 KB)
📄 class-wp-upgrader.php(46.85 KB)
📄 class-wp-users-list-table.php(18.61 KB)
📄 comment.php(6.08 KB)
📄 continents-cities.php(20.06 KB)
📄 credits.php(5.73 KB)
📄 dashboard.php(68.18 KB)
📄 deprecated.php(40.8 KB)
📄 edit-tag-messages.php(1.44 KB)
📄 export.php(25.26 KB)
📄 file.php(95.94 KB)
📄 image-edit.php(43.12 KB)
📄 image.php(41.73 KB)
📄 import.php(6.46 KB)
📄 list-table.php(3.71 KB)
📄 media.php(116.31 KB)
📄 menu.php(9.39 KB)
📄 meta-boxes.php(64.34 KB)
📄 misc.php(44.73 KB)
📄 ms-admin-filters.php(1.27 KB)
📄 ms-deprecated.php(3.68 KB)
📄 ms.php(33.53 KB)
📄 nav-menu.php(48.84 KB)
📄 network.php(26.35 KB)
📄 noop.php(1.12 KB)
📄 options.php(4.19 KB)
📄 plugin-install.php(38.19 KB)
📄 plugin.php(91.33 KB)
📄 post.php(80.39 KB)
📄 privacy-tools.php(32.67 KB)
📄 revision.php(16.18 KB)
📄 schema.php(44.46 KB)
📄 screen.php(6.23 KB)
📄 taxonomy.php(8.23 KB)
📄 template.php(96.96 KB)
📄 theme-install.php(6.83 KB)
📄 theme.php(46.62 KB)
📄 translation-install.php(10.82 KB)
📄 update-core.php(68.86 KB)
📄 update.php(33.63 KB)
📄 upgrade.php(113.3 KB)
📄 user.php(22.98 KB)
📄 widgets.php(10.66 KB)

Editing: class-file-upload-upgrader.php

<?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.
 */
#[AllowDynamicProperties]
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'] );
			}

if ( 'pluginzip' === $form || 'themezip' === $form ) {
				if ( ! wp_zip_file_is_valid( $file['file'] ) ) {
					wp_delete_file( $file['file'] );

if ( 'pluginzip' === $form ) {
						$plugins_page = sprintf(
							'<a href="%s">%s</a>',
							self_admin_url( 'plugin-install.php' ),
							__( 'Return to the Plugin Installer' )
						);
						wp_die( __( 'Incompatible Archive.' ) . '<br />' . $plugins_page );
					}

if ( 'themezip' === $form ) {
						$themes_page = sprintf(
							'<a href="%s" target="_parent">%s</a>',
							self_admin_url( 'theme-install.php' ),
							__( 'Return to the Theme Installer' )
						);
						wp_die( __( 'Incompatible Archive.' ) . '<br />' . $themes_page );
					}
				}
			}

$this->filename = $_FILES[ $form ]['name'];
			$this->package  = $file['file'];

// Construct the attachment array.
			$attachment = 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( $attachment, $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.
			$uploads = wp_upload_dir();
			if ( ! ( $uploads && false === $uploads['error'] ) ) {
				wp_die( $uploads['error'] );
			}

$this->filename = sanitize_file_name( $_GET[ $urlholder ] );
			$this->package  = $uploads['basedir'] . '/' . $this->filename;

if ( ! str_starts_with( realpath( $this->package ), realpath( $uploads['basedir'] ) ) ) {
				wp_die( __( 'Please select a file' ) );
			}
		}
	}

/**
	 * Deletes 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;
	}
}

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Editing: class-file-upload-upgrader.php

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