X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/03f2fa83c13c1b532284205fa7efcab9b8b2c41f..e3ff8f35458a959c1879c0a4976701ed8dcfe651:/wp-admin/load-styles.php

diff --git a/wp-admin/load-styles.php b/wp-admin/load-styles.php
index 2563e6f6..de208814 100644
--- a/wp-admin/load-styles.php
+++ b/wp-admin/load-styles.php
@@ -8,14 +8,21 @@
 error_reporting(0);
 
 /** Set ABSPATH for execution */
-define( 'ABSPATH', dirname(dirname(__FILE__)) . '/' );
+if ( ! defined( 'ABSPATH' ) ) {
+	define( 'ABSPATH', dirname( dirname( __FILE__ ) ) . '/' );
+}
+
 define( 'WPINC', 'wp-includes' );
 
 require( ABSPATH . 'wp-admin/includes/noop.php' );
 require( ABSPATH . WPINC . '/script-loader.php' );
 require( ABSPATH . WPINC . '/version.php' );
 
-$load = preg_replace( '/[^a-z0-9,_-]+/i', '', $_GET['load'] );
+$load = $_GET['load'];
+if ( is_array( $load ) ) {
+	$load = implode( '', $load );
+}
+$load = preg_replace( '/[^a-z0-9,_-]+/i', '', $load );
 $load = array_unique( explode( ',', $load ) );
 
 if ( empty($load) )
@@ -30,11 +37,25 @@ $out = '';
 $wp_styles = new WP_Styles();
 wp_default_styles($wp_styles);
 
+if ( isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) && stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) === $wp_version ) {
+	$protocol = $_SERVER['SERVER_PROTOCOL'];
+	if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ) ) ) {
+		$protocol = 'HTTP/1.0';
+	}
+	header( "$protocol 304 Not Modified" );
+	exit();
+}
+
 foreach ( $load as $handle ) {
 	if ( !array_key_exists($handle, $wp_styles->registered) )
 		continue;
 
 	$style = $wp_styles->registered[$handle];
+
+	if ( empty( $style->src ) ) {
+		continue;
+	}
+
 	$path = ABSPATH . $style->src;
 
 	if ( $rtl && ! empty( $style->extra['rtl'] ) ) {
@@ -54,6 +75,7 @@ foreach ( $load as $handle ) {
 	}
 }
 
+header("Etag: $wp_version");
 header('Content-Type: text/css; charset=UTF-8');
 header('Expires: ' . gmdate( "D, d M Y H:i:s", time() + $expires_offset ) . ' GMT');
 header("Cache-Control: public, max-age=$expires_offset");