Changeset 47891 for trunk/src/wp-includes/kses.php

Timestamp:

06/02/2020 11:44:40 PM (6 years ago)

Author:

adamsilverstein

Message:

Formatting: add a new 'safe_style_disallowed_chars' filter.

Enable developers to change the regex used in safecss_filter_attr to limit characters in the parsed CSS.

Props paulschreiber, swissspidy, rmccue, bartekcholewa, miinasikk.
Fixes #37134.

File:

• trunk/src/wp-includes/kses.php (modified) (1 diff)

trunk/src/wp-includes/kses.php

@@ -2302 +2302 @@
                 }
 
-                // Remove any CSS containing containing \ ( & } = or comments, except for url() useage checked above.
-                if ( $found && ! preg_match( '%[\\\(&=}]|/\*%', $css_test_string ) ) {
-                        if ( '' !== $css ) {
-                                $css .= ';';
+                if ( $found ) {
+                        /**
+                         * Filters the regex limiting the list of characters not allowed in CSS rules.
+                         *
+                         * Default behaviour is to remove any css containing \ ( & } = or comments, except for url() usage.
+                         *
+                         * @since 5.5.0
+                         *
+                         * @param string $regex           Regex pattern of disallowed characters in CSS rules. Default is '%[\\\(&=}]|/\*%'.
+                         * @param string $css_test_string CSS value to test.
+                         */
+                        $disallowed_chars = apply_filters( 'safe_style_disallowed_chars', '%[\\\(&=}]|/\*%', $css_test_string );
+                        if ( ! preg_match( $disallowed_chars, $css_test_string ) ) {
+                                if ( '' !== $css ) {
+                                        $css .= ';';
+                                }
+                                $css .= $css_item;
                         }
-
-                        $css .= $css_item;
                 }
         }