Source
File: wp-admin/includes/ajax-actions.php
function wp_ajax_update_theme() {
check_ajax_referer( 'updates' );
if ( empty( $_POST['slug'] ) ) {
wp_send_json_error(
array(
'slug' => '',
'errorCode' => 'no_theme_specified',
'errorMessage' => __( 'No theme specified.' ),
)
);
}
$stylesheet = preg_replace( '/[^A-z0-9_\-]/', '', wp_unslash( $_POST['slug'] ) );
$status = array(
'update' => 'theme',
'slug' => $stylesheet,
'oldVersion' => '',
'newVersion' => '',
);
if ( ! current_user_can( 'update_themes' ) ) {
$status['errorMessage'] = __( 'Sorry, you are not allowed to update themes for this site.' );
wp_send_json_error( $status );
}
$theme = wp_get_theme( $stylesheet );
if ( $theme->exists() ) {
$status['oldVersion'] = $theme->get( 'Version' );
}
require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
$current = get_site_transient( 'update_themes' );
if ( empty( $current ) ) {
wp_update_themes();
}
$skin = new WP_Ajax_Upgrader_Skin();
$upgrader = new Theme_Upgrader( $skin );
$result = $upgrader->bulk_upgrade( array( $stylesheet ) );
if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
$status['debug'] = $skin->get_upgrade_messages();
}
if ( is_wp_error( $skin->result ) ) {
$status['errorCode'] = $skin->result->get_error_code();
$status['errorMessage'] = $skin->result->get_error_message();
wp_send_json_error( $status );
} elseif ( $skin->get_errors()->has_errors() ) {
$status['errorMessage'] = $skin->get_error_messages();
wp_send_json_error( $status );
} elseif ( is_array( $result ) && ! empty( $result[ $stylesheet ] ) ) {
// Theme is already at the latest version.
if ( true === $result[ $stylesheet ] ) {
$status['errorMessage'] = $upgrader->strings['up_to_date'];
wp_send_json_error( $status );
}
$theme = wp_get_theme( $stylesheet );
if ( $theme->exists() ) {
$status['newVersion'] = $theme->get( 'Version' );
}
wp_send_json_success( $status );
} elseif ( false === $result ) {
global $wp_filesystem;
$status['errorCode'] = 'unable_to_connect_to_filesystem';
$status['errorMessage'] = __( 'Unable to connect to the filesystem. Please confirm your credentials.' );
// Pass through the error from WP_Filesystem if one was raised.
if ( $wp_filesystem instanceof WP_Filesystem_Base && is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors() ) {
$status['errorMessage'] = esc_html( $wp_filesystem->errors->get_error_message() );
}
wp_send_json_error( $status );
}
// An unhandled error occurred.
$status['errorMessage'] = __( 'Theme update failed.' );
wp_send_json_error( $status );
}