Theme_Upgrader::check_package( string $source ): string|WP_Error

Source

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

	$this->new_theme_data = array();

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

	// Check that 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 ) ) { // Confidence 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>'
			)
		);
	}

	// All these headers are needed on Theme_Installer_Skin::do_overwrite().
	$info = get_file_data(
		$working_directory . 'style.css',
		array(
			'Name'        => 'Theme Name',
			'Version'     => 'Version',
			'Author'      => 'Author',
			'Template'    => 'Template',
			'RequiresWP'  => 'Requires at least',
			'RequiresPHP' => 'Requires PHP',
		)
	);

	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 does not contain a valid theme header.' ),
				'<code>style.css</code>'
			)
		);
	}

	/*
	 * Parent themes must contain an index file:
	 * - classic themes require /index.php
	 * - block themes require /templates/index.html or block-templates/index.html (deprecated 5.9.0).
	 */
	if (
		empty( $info['Template'] ) &&
		! file_exists( $working_directory . 'index.php' ) &&
		! file_exists( $working_directory . 'templates/index.html' ) &&
		! file_exists( $working_directory . 'block-templates/index.html' )
	) {
		return new WP_Error(
			'incompatible_archive_theme_no_index',
			$this->strings['incompatible_archive'],
			sprintf(
				/* translators: 1: templates/index.html, 2: index.php, 3: Documentation URL, 4: Template, 5: style.css */
				__( 'Template is missing. Standalone themes need to have a %1$s or %2$s template file. <a href="%3$s">Child themes</a> need to have a %4$s header in the %5$s stylesheet.' ),
				'<code>templates/index.html</code>',
				'<code>index.php</code>',
				__( 'https://developer.wordpress.org/themes/advanced-topics/child-themes/' ),
				'<code>Template</code>',
				'<code>style.css</code>'
			)
		);
	}

	$requires_php = isset( $info['RequiresPHP'] ) ? $info['RequiresPHP'] : null;
	$requires_wp  = isset( $info['RequiresWP'] ) ? $info['RequiresWP'] : null;

	if ( ! is_php_version_compatible( $requires_php ) ) {
		$error = sprintf(
			/* translators: 1: Current PHP version, 2: Version required by the uploaded theme. */
			__( 'The PHP version on your server is %1$s, however the uploaded theme requires %2$s.' ),
			PHP_VERSION,
			$requires_php
		);

		return new WP_Error( 'incompatible_php_required_version', $this->strings['incompatible_archive'], $error );
	}
	if ( ! is_wp_version_compatible( $requires_wp ) ) {
		$error = sprintf(
			/* translators: 1: Current WordPress version, 2: Version required by the uploaded theme. */
			__( 'Your WordPress version is %1$s, however the uploaded theme requires %2$s.' ),
			$wp_version,
			$requires_wp
		);

		return new WP_Error( 'incompatible_wp_required_version', $this->strings['incompatible_archive'], $error );
	}

	$this->new_theme_data = $info;

	return $source;
}

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