← All changes | lib/com/util-robots.php +132 -0 22.5.1 → 22.7.0 View file →

		@@ -1,0 +1,132 @@
	1	+<?php
	2	+/*
	3	+ * License: GPLv3
	4	+ * License URI: https://www.gnu.org/licenses/gpl.txt
	5	+ * Copyright 2020-2026 Jean-Sebastien Morisset (https://surniaulula.com/)
	6	+ */
	7	+
	8	+if ( ! defined( 'ABSPATH' ) ) {
	9	+
	10	+ die( 'These aren\'t the droids you\'re looking for.' );
	11	+}
	12	+
	13	+if ( ! class_exists( 'SucomUtilRobots' ) ) {
	14	+
	15	+ class SucomUtilRobots {
	16	+
	17	+ private static $default_directives = array(
	18	+ 'follow' => true, // Follow by default.
	19	+ 'index' => true, // Index by default.
	20	+ 'noarchive' => false,
	21	+ 'nofollow' => false, // Do not follow links on this webpage.
	22	+ 'noimageindex' => false, // Do not index images on this webpage.
	23	+ 'noindex' => false, // Do not show this webpage in search results.
	24	+ 'nosnippet' => false, // Do not show a text snippet or a video preview in search results.
	25	+ 'notranslate' => false,
	26	+ 'max-snippet' => -1, // Max characters for textual snippet (-1 = no limit).
	27	+ 'max-image-preview' => 'large', // Max size for image preview.
	28	+ 'max-video-preview' => -1, // Max seconds for video snippet (-1 = no limit).
	29	+ );
	30	+
	31	+ private static $inverse_directives = array(
	32	+ 'nofollow' => array( 'follow' ), // Do not follow links on this webpage.
	33	+ 'noimageindex' => array( 'max-image-preview' ), // Do not index images on this webpage.
	34	+ 'noindex' => array( 'index' ), // Do not show this webpage in search results.
	35	+ 'nosnippet' => array( 'max-snippet', 'max-video-preview' ), // Do not show a text snippet or a video preview in search results.
	36	+ );
	37	+
	38	+ /*
	39	+ * See https://developers.google.com/search/reference/robots_meta_tag.
	40	+ */
	41	+ public static function get_default_directives() {
	42	+
	43	+ $is_public = get_option( 'blog_public' );
	44	+ $directives = self::$default_directives;
	45	+
	46	+ /*
	47	+ * If the site is not public, discourage robots from indexing the site.
	48	+ */
	49	+ if ( ! $is_public ) {
	50	+
	51	+ $directives[ 'follow' ] = false; // No follow.
	52	+ $directives[ 'index' ] = false; // No index.
	53	+ $directives[ 'noarchive' ] = true;
	54	+ $directives[ 'nofollow' ] = true;
	55	+ $directives[ 'noimageindex' ] = true;
	56	+ $directives[ 'noindex' ] = true;
	57	+ $directives[ 'nosnippet' ] = true;
	58	+ $directives[ 'notranslate' ] = true;
	59	+
	60	+ /*
	61	+ * The webpage should not be indexed, but allow robots to follow links.
	62	+ */
	63	+ } elseif ( isset( $_GET[ 'replytocom' ] ) || is_embed() || is_404() || is_search() ) {
	64	+
	65	+ $directives[ 'index' ] = false; // No index.
	66	+ $directives[ 'noarchive' ] = true;
	67	+ $directives[ 'noindex' ] = true;
	68	+ $directives[ 'nosnippet' ] = true;
	69	+ }
	70	+
	71	+ return apply_filters( 'sucom_robots_default_directives', $directives );
	72	+ }
	73	+
	74	+ /*
	75	+ * Properly set boolean directives and their inverse boolean directives.
	76	+ */
	77	+ public static function set_directive( $key, $value, array &$directives ) {
	78	+
	79	+ if ( isset( self::$default_directives[ $key ] ) ) { // Directive must be known.
	80	+
	81	+ if ( is_bool( self::$default_directives[ $key ] ) ) { // Default boolean, so set as boolean.
	82	+
	83	+ $directives[ $key ] = $value ? true : false; // Convert to boolean.
	84	+
	85	+ /*
	86	+ * Check for inverse directives.
	87	+ */
	88	+ if ( isset( self::$inverse_directives[ $key ] ) ) {
	89	+
	90	+ foreach ( self::$inverse_directives[ $key ] as $inverse_key ) {
	91	+
	92	+ /*
	93	+ * If the inverse is also a boolean, then set the inverse boolean value.
	94	+ */
	95	+ if ( isset( self::$default_directives[ $inverse_key ] ) ) { // Directive must be known.
	96	+
	97	+ if ( is_bool( self::$default_directives[ $inverse_key ] ) ) { // Also a boolean.
	98	+
	99	+ $directives[ $inverse_key ] = $value ? false : true; // Inverse boolean.
	100	+ }
	101	+ }
	102	+ }
	103	+ }
	104	+
	105	+ } else {
	106	+
	107	+ $directives[ $key ] = $value;
	108	+ }
	109	+ }
	110	+ }
	111	+
	112	+ /*
	113	+ * Sanity check - make sure inverse directives are removed.
	114	+ */
	115	+ public static function sanitize_directives( array &$directives ) {
	116	+
	117	+ foreach ( self::$inverse_directives as $key => $inverse_keys ) {
	118	+
	119	+ if ( ! empty( $directives[ $key ] ) ) { // $key exists and is true.
	120	+
	121	+ foreach ( $inverse_keys as $inverse_key ) { // Unset each inverse directive.
	122	+
	123	+ if ( isset( $directives[ $inverse_key ] ) ) { // Just in case.
	124	+
	125	+ unset( $directives[ $inverse_key ] );
	126	+ }
	127	+ }
	128	+ }
	129	+ }
	130	+ }
	131	+ }
	132	+}