W3cubDocs

/WordPress

Theme_Upgrader::check_package( string $source )

Check that the package source contains a valid theme.

Description

Hooked to the ‘upgrader_source_selection’ filter by Theme_Upgrader::install(). It will return an error if the theme doesn’t have style.css or index.php files.

Parameters

$source

(string) (Required) The full path to the package source.

Return

(string|WP_Error) The source or a WP_Error.

Source

File: wp-admin/includes/class-theme-upgrader.php

public function check_package( $source ) {
		global $wp_filesystem;

		if ( is_wp_error( $source ) ) {
			return $source;
		}

		// Check the folder contains a valid theme
		$working_directory = str_replace( $wp_filesystem->wp_content_dir(), trailingslashit( WP_CONTENT_DIR ), $source );
		if ( ! is_dir( $working_directory ) ) { // Sanity check, if the above fails, let's not prevent installation.
			return $source;
		}

		// A proper archive should have a style.css file in the single subdirectory
		if ( ! file_exists( $working_directory . 'style.css' ) ) {
			return new WP_Error(
				'incompatible_archive_theme_no_style',
				$this->strings['incompatible_archive'],
				sprintf(
					/* translators: %s: style.css */
					__( 'The theme is missing the %s stylesheet.' ),
					'<code>style.css</code>'
				)
			);
		}

		$info = get_file_data(
			$working_directory . 'style.css',
			array(
				'Name'     => 'Theme Name',
				'Template' => 'Template',
			)
		);

		if ( empty( $info['Name'] ) ) {
			return new WP_Error(
				'incompatible_archive_theme_no_name',
				$this->strings['incompatible_archive'],
				sprintf(
					/* translators: %s: style.css */
					__( 'The %s stylesheet doesn&#8217;t contain a valid theme header.' ),
					'<code>style.css</code>'
				)
			);
		}

		// If it's not a child theme, it must have at least an index.php to be legit.
		if ( empty( $info['Template'] ) && ! file_exists( $working_directory . 'index.php' ) ) {
			return new WP_Error(
				'incompatible_archive_theme_no_index',
				$this->strings['incompatible_archive'],
				sprintf(
					/* translators: %s: index.php */
					__( 'The theme is missing the %s file.' ),
					'<code>index.php</code>'
				)
			);
		}

		return $source;
	}

Changelog

Version Description
3.3.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/theme_upgrader/check_package