diff options
Diffstat (limited to 'wp-admin/load-styles.php')
| -rw-r--r-- | wp-admin/load-styles.php | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/wp-admin/load-styles.php b/wp-admin/load-styles.php index fe4a4ee..9fd0fc1 100644 --- a/wp-admin/load-styles.php +++ b/wp-admin/load-styles.php @@ -48,7 +48,26 @@ $out = ''; $wp_styles = new WP_Styles(); wp_default_styles( $wp_styles ); -if ( isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) && stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) === $wp_version ) { +$etag = "WP:{$wp_version};"; + +foreach ( $load as $handle ) { + if ( ! array_key_exists( $handle, $wp_styles->registered ) ) { + continue; + } + + $ver = $wp_styles->registered[ $handle ]->ver ? $wp_styles->registered[ $handle ]->ver : $wp_version; + $etag .= "{$handle}:{$ver};"; +} + +/* + * This is not intended to be cryptographically secure, just a fast way to get + * a fixed length string based on the script versions. As this file does not + * load the full WordPress environment, it is not possible to use the salted + * wp_hash() function. + */ +$etag = 'W/"' . md5( $etag ) . '"'; + +if ( isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) && stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) === $etag ) { header( "$protocol 304 Not Modified" ); exit; } @@ -84,7 +103,7 @@ foreach ( $load as $handle ) { } } -header( "Etag: $wp_version" ); +header( "Etag: $etag" ); 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" ); |