Ticket #23367: 23367.5.diff

src/wp-admin/admin.php

@@ -30 +30 @@
 
 require_once(dirname(dirname(__FILE__)) . '/wp-load.php');
 
+/**
+ * Remove single-use URL parameters and create canonical link based on new URL.
+ *
+ * Remove specific query string parameters from a URL, create the canonical link,
+ * put it in the admin header, and change the current URL to match.
+ *
+ * @since 4.2.0
+ */
+function wp_admin_canonical_url() {
+        $removable_url_params = array(
+                'message', 'updated', 'settings-updated',
+                'saved', 'activated', 'activate',
+                'deactivate', 'locked', 'skipped',
+                'deleted', 'trashed', 'untrashed',
+        );
+
+        /**
+         * Filter the list of URL parameters to remove.
+         *
+         * @since 4.2.0
+         *
+         * @param array $removable_url_params An array of parameters to remove from the URL.
+         */
+        $removable_url_params = apply_filters( 'removable_url_params', $removable_url_params );
+
+        // Ensure we're using an absolute URL.
+        $current_url  = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
+        $filtered_url = remove_query_arg( $removable_url_params, $current_url );
+        ?>
+        <link id="wp-admin-canonical" rel="canonical" href="<?php echo esc_url( $filtered_url ); ?>" />
+        <script>if ( window.history.replaceState ) {
+                        window.history.replaceState( null, null, document.getElementById( 'wp-admin-canonical' ).href );
+                }</script>
+<?php
+}
+
+add_action( 'admin_head', 'wp_admin_canonical_url' );
+
 nocache_headers();
 
 if ( get_option('db_upgraded') ) {