Ticket #20902: 20902-fix-redirect-canonical-query-vars.patch

src/wp-includes/canonical.php

@@ -374 +374 @@
                 }
         }
 
+        /*
+         * Enhancement: Support redirecting query vars like ?pagename=blog,
+         * ?author_name=admin, and ?post_format=image to their canonical permalink forms.
+         */
+
+        if ( isset( $_GET['pagename'] ) && ! empty( $_GET['pagename'] ) ) {
+                $page = get_page_by_path( sanitize_title( $_GET['pagename'] ) );
+                if ( $page && ! is_wp_error( $page ) ) {
+                        $redirect_url = get_permalink( $page->ID );
+                        if ( $redirect_url && $redirect_url !== $requested_url ) {
+                                wp_redirect( $redirect_url, 301 );
+                                exit;
+                        }
+                }
+        }
+
+        if ( isset( $_GET['author_name'] ) && ! empty( $_GET['author_name'] ) ) {
+                $user = get_user_by( 'slug', sanitize_title( $_GET['author_name'] ) );
+                if ( $user && ! is_wp_error( $user ) ) {
+                        $redirect_url = get_author_posts_url( $user->ID );
+                        if ( $redirect_url && $redirect_url !== $requested_url ) {
+                                wp_redirect( $redirect_url, 301 );
+                                exit;
+                        }
+                }
+        }
+
+        if ( isset( $_GET['post_format'] ) && ! empty( $_GET['post_format'] ) ) {
+                $term = get_term_by( 'slug', sanitize_title( $_GET['post_format'] ), 'post_format' );
+                if ( $term && ! is_wp_error( $term ) ) {
+                        $redirect_url = get_term_link( $term );
+                        if ( $redirect_url && $redirect_url !== $requested_url ) {
+                                wp_redirect( $redirect_url, 301 );
+                                exit;
+                        }
+                }
+        }
+
         // Canonical redirect was not applicable
         return false;
 }