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<?php |
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/** |
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* @package Polylang |
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*/ |
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|
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/** |
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* Manages canonical redirect on frontend. |
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* |
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* @since 3.3 |
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*/ |
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class PLL_Canonical { |
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/** |
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* Stores the plugin options. |
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* |
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* @var array |
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*/ |
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protected $options; |
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|
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/** |
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* @var PLL_Model |
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*/ |
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protected $model; |
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|
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/** |
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* Instance of a child class of PLL_Links_Model. |
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* |
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* @var PLL_Links_Model |
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*/ |
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protected $links_model; |
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|
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/** |
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* Current language. |
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* |
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* @var PLL_Language |
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*/ |
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protected $curlang; |
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|
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/** |
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* Constructor. |
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* |
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* @since 3.3 |
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* |
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* @param object $polylang Main Polylang object. |
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*/ |
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public function __construct( &$polylang ) { |
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$this->links_model = &$polylang->links_model; |
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$this->model = &$polylang->model; |
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$this->options = &$polylang->options; |
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$this->curlang = &$polylang->curlang; |
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} |
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|
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/** |
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* If the language code is not in agreement with the language of the content, |
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* redirects incoming links to the proper URL to avoid duplicate content. |
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* |
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* @since 0.9.6 |
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* |
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* @global WP_Query $wp_query WordPress Query object. |
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* @global bool $is_IIS |
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* |
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* @param string $requested_url Optional, defaults to requested url. |
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* @param bool $do_redirect Optional, whether to perform the redirect or not. |
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* @return string|void Returns if redirect is not performed. |
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*/ |
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public function check_canonical_url( $requested_url = '', $do_redirect = true ) { |
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global $wp_query; |
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|
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// Don't redirect in same cases as WP. |
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if ( is_trackback() || is_search() || is_admin() || is_preview() || is_robots() || ( $GLOBALS['is_IIS'] && ! iis7_supports_permalinks() ) ) { |
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return; |
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} |
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|
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// Don't redirect mysite.com/?attachment_id= to mysite.com/en/?attachment_id=. |
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if ( 1 == $this->options['force_lang'] && is_attachment() && isset( $_GET['attachment_id'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification |
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return; |
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} |
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|
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/* |
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* If the default language code is not hidden and the static front page url contains the page name, |
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* the customizer lands here and the code below would redirect to the list of posts. |
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*/ |
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if ( is_customize_preview() ) { |
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return; |
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} |
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|
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if ( empty( $requested_url ) ) { |
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$requested_url = pll_get_requested_url(); |
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} |
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|
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if ( ( is_single() && ( ! is_attachment() || get_option( 'wp_attachment_pages_enabled' ) ) ) || ( is_page() && ! is_front_page() ) ) { |
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$post = get_post(); |
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if ( $post instanceof WP_Post && $this->model->is_translated_post_type( $post->post_type ) ) { |
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$language = $this->model->post->get_language( (int) $post->ID ); |
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} |
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} |
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|
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if ( ! empty( $wp_query->tax_query ) ) { |
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if ( $this->model->is_translated_taxonomy( $this->get_queried_taxonomy( $wp_query->tax_query ) ) ) { |
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$term_id = $this->get_queried_term_id( $wp_query->tax_query ); |
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if ( $term_id ) { |
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$language = $this->model->term->get_language( $term_id ); |
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} |
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} |
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} |
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|
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if ( $wp_query->is_posts_page ) { |
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$page_id = get_query_var( 'page_id' ); |
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if ( ! $page_id ) { |
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$page_id = get_queried_object_id(); |
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} |
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if ( $page_id && is_numeric( $page_id ) ) { |
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$language = $this->model->post->get_language( (int) $page_id ); |
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} |
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} |
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|
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if ( 3 === $this->options['force_lang'] ) { |
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$requested_host = wp_parse_url( $requested_url, PHP_URL_HOST ); |
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foreach ( $this->options['domains'] as $lang => $domain ) { |
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$host = wp_parse_url( $domain, PHP_URL_HOST ); |
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if ( $requested_host && $host && ltrim( $requested_host, 'w.' ) === ltrim( $host, 'w.' ) ) { |
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$language = $this->model->get_language( $lang ); |
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} |
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} |
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} |
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|
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if ( empty( $language ) ) { |
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$language = $this->curlang; |
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$redirect_url = $requested_url; |
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} else { |
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$redirect_url = $this->redirect_canonical( $requested_url, $language ); |
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$redirect_url = $this->options['force_lang'] ? |
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$this->links_model->switch_language_in_link( $redirect_url, $language ) : |
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$this->links_model->remove_language_from_link( $redirect_url ); // Works only for default permalinks. |
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} |
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|
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|
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/** |
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* Filters the canonical url detected by Polylang. |
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* |
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* @since 1.6 |
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* |
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* @param string|false $redirect_url False or the url to redirect to. |
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* @param PLL_Language $language The language detected. |
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*/ |
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$redirect_url = apply_filters( 'pll_check_canonical_url', $redirect_url, $language ); |
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|
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if ( ! $redirect_url || $requested_url === $redirect_url ) { |
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return $requested_url; |
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} |
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|
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if ( ! $do_redirect ) { |
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return $redirect_url; |
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} |
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|
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// Protect against chained redirects. |
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if ( $redirect_url === $this->check_canonical_url( $redirect_url, false ) && wp_validate_redirect( $redirect_url ) ) { |
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wp_safe_redirect( $redirect_url, 301, POLYLANG ); |
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exit; |
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} |
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} |
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|
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/** |
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* Returns the term_id of the requested term. |
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* |
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* @since 2.9 |
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* |
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* @param WP_Tax_Query $tax_query An instance of WP_Tax_Query. |
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* @return int |
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*/ |
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protected function get_queried_term_id( $tax_query ) { |
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$queried_terms = $tax_query->queried_terms; |
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$taxonomy = $this->get_queried_taxonomy( $tax_query ); |
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|
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if ( ! is_array( $queried_terms[ $taxonomy ]['terms'] ) ) { |
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return 0; |
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} |
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$field = $queried_terms[ $taxonomy ]['field']; |
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$term = reset( $queried_terms[ $taxonomy ]['terms'] ); |
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$lang = isset( $queried_terms['language']['terms'] ) ? reset( $queried_terms['language']['terms'] ) : ''; |
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|
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// We can get a term_id when requesting a plain permalink, eg /?cat=1. |
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if ( 'term_id' === $field ) { |
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return $term; |
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} |
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|
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// We get a slug when requesting a pretty permalink. Let's query all corresponding terms. |
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$args = array( |
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'lang' => '', |
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'taxonomy' => $taxonomy, |
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$field => $term, |
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'hide_empty' => false, |
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'fields' => 'ids', |
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); |
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$term_ids = get_terms( $args ); |
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|
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if ( ! is_array( $term_ids ) || empty( $term_ids ) ) { |
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return 0; |
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} |
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|
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$term_ids = array_filter( $term_ids, 'is_numeric' ); |
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|
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$filtered_terms_by_lang = array_filter( |
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$term_ids, |
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function ( $term_id ) use ( $lang ) { |
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$term_lang = $this->model->term->get_language( (int) $term_id ); |
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|
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return ! empty( $term_lang ) && $term_lang->slug === $lang; |
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} |
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); |
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|
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$tr_term = (int) reset( $filtered_terms_by_lang ); |
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|
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if ( ! empty( $tr_term ) ) { |
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// The queried term exists in the desired language. |
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return $tr_term; |
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} |
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|
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// The queried term doesn't exist in the desired language, let's return the first one retrieved. |
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return (int) reset( $term_ids ); |
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} |
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|
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/** |
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* Find the taxonomy being queried. |
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* |
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* @since 2.9 |
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* |
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* @param WP_Tax_Query $tax_query An instance of WP_Tax_Query. |
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* @return string A taxonomy slug |
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*/ |
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protected function get_queried_taxonomy( $tax_query ) { |
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$queried_terms = $tax_query->queried_terms; |
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unset( $queried_terms['language'] ); |
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|
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return (string) key( $queried_terms ); |
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} |
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|
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/** |
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* Evaluates the canonical redirect url through the deidcated WP function. |
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* |
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* @since 3.3 |
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* |
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* @global WP_Query $wp_query WordPress Query object. |
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* |
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* @param string $url Requested url. |
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* @param PLL_Language $language Language of the queried object. |
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* @return string |
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*/ |
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protected function redirect_canonical( $url, $language ) { |
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/** |
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* @var WP_Query |
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*/ |
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global $wp_query; |
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|
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$this->curlang = $language; // Hack to filter the `page_for_posts` option in the correct language. |
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|
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$backup_wp_query = $wp_query; |
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|
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if ( isset( $wp_query->tax_query ) ) { |
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unset( $wp_query->tax_query->queried_terms['language'] ); |
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unset( $wp_query->query['lang'] ); |
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} |
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|
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$redirect_url = redirect_canonical( $url, false ); |
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|
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$wp_query = $backup_wp_query; |
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|
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return $redirect_url ?: $url; |
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} |
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} |
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|
