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