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WordPress

Kim Swenson
Kim Swenson
6,379 Points
Posted by Kim Swenson
Kim Swenson
6,379 Points

Installing a patch for local WordPress files

I'm having trouble installing a patch for the latest version of Wordpress (4.9). There is a known issue with the new ajax code. Basically, you can't edit the CSS files if you are using Windows computer for your local server. There is a patch in place until this is fixed, but I'm getting confused trying to install it.

Here is the ticket with the patch and description of the issue: https://core.trac.wordpress.org/ticket/42609

At the bottom of the description area, it says that "Replacing validate_file with validate_file_to_edit in wp_edit_theme_plugin_file() should fix the issue." Where do I replace this?

Thank you in advance!

1 Answer

Liam Maclachlan
Liam Maclachlan
22,805 Points
Liam Maclachlan
Liam Maclachlan
22,805 Points

Hi Kim,

I had a look in the .patch and .diff files and it shows the folowing:

Index: wp-admin/includes/file.php
===================================================================
--- wp-admin/includes/file.php  (revision 42032)
+++ wp-admin/includes/file.php  (working copy)
@@ -385,7 +385,7 @@
            return new WP_Error( 'invalid_plugin' );
        }

-       if ( 0 !== validate_file( $file, get_plugin_files( $plugin ) ) ) {
+       if ( ! in_array( validate_file( $file, get_plugin_files( $plugin ) ), array( 0, 2 ) ) ) {
            return new WP_Error( 'bad_plugin_file_path', __( 'Sorry, that file cannot be edited.' ) );
        }

@@ -445,7 +445,7 @@
            }
        }

-       if ( 0 !== validate_file( $real_file, $allowed_files ) ) {
+       if ( ! in_array( validate_file( $real_file, $allowed_files ), array( 0, 2 ) ) ) {
            return new WP_Error( 'disallowed_theme_file', __( 'Sorry, that file cannot be edited.' ) );
        }

and .diff:

Index: src/wp-admin/includes/file.php
===================================================================
--- src/wp-admin/includes/file.php  (revision 42224)
+++ src/wp-admin/includes/file.php  (working copy)
@@ -433,31 +433,31 @@ function wp_edit_theme_plugin_file( $arg
            switch ( $type ) {
                case 'php':
                    $allowed_files = array_merge( $allowed_files, $theme->get_files( 'php', -1 ) );
                    break;
                case 'css':
                    $style_files = $theme->get_files( 'css', -1 );
                    $allowed_files['style.css'] = $style_files['style.css'];
                    $allowed_files = array_merge( $allowed_files, $style_files );
                    break;
                default:
                    $allowed_files = array_merge( $allowed_files, $theme->get_files( $type, -1 ) );
                    break;
            }
        }

-       if ( 0 !== validate_file( $real_file, $allowed_files ) ) {
+       if ( 0 !== validate_file( $file, array_keys( $allowed_files ) ) ) {
            return new WP_Error( 'disallowed_theme_file', __( 'Sorry, that file cannot be edited.' ) );
        }

        $is_active = ( get_stylesheet() === $stylesheet || get_template() === $stylesheet );
    } else {
        return new WP_Error( 'missing_theme_or_plugin' );
    }

    // Ensure file is real.
    if ( ! is_file( $real_file ) ) {
        return new WP_Error( 'file_does_not_exist', __( 'No such file exists! Double check the name and try again.' ) );
    }

    // Ensure file extension is allowed.
    $extension = null;

You need to go in to the files (wp-admin/includes/file.php) and replace the lines with the '-' sign at the start with the lines below that has the '+' sign at the start.

Hope this helps. Let me know if you have any further issues.

Cheers :)