| 1 |
<?php |
| 2 |
/** |
| 3 |
* @package Polylang |
| 4 |
*/ |
| 5 |
|
| 6 |
/** |
| 7 |
* Manages canonical redirect on frontend. |
| 8 |
* |
| 9 |
* @since 3.3 |
| 10 |
*/ |
| 11 |
class PLL_Canonical { |
| 12 |
/** |
| 13 |
* Stores the plugin options. |
| 14 |
* |
| 15 |
* @var array |
| 16 |
*/ |
| 17 |
protected $options; |
| 18 |
|
| 19 |
/** |
| 20 |
* @var PLL_Model |
| 21 |
*/ |
| 22 |
protected $model; |
| 23 |
|
| 24 |
/** |
| 25 |
* Instance of a child class of PLL_Links_Model. |
| 26 |
* |
| 27 |
* @var PLL_Links_Model |
| 28 |
*/ |
| 29 |
protected $links_model; |
| 30 |
|
| 31 |
/** |
| 32 |
* Current language. |
| 33 |
* |
| 34 |
* @var PLL_Language |
| 35 |
*/ |
| 36 |
protected $curlang; |
| 37 |
|
| 38 |
/** |
| 39 |
* Constructor. |
| 40 |
* |
| 41 |
* @since 3.3 |
| 42 |
* |
| 43 |
* @param object $polylang Main Polylang object. |
| 44 |
*/ |
| 45 |
public function __construct( &$polylang ) { |
| 46 |
$this->links_model = &$polylang->links_model; |
| 47 |
$this->model = &$polylang->model; |
| 48 |
$this->options = &$polylang->options; |
| 49 |
$this->curlang = &$polylang->curlang; |
| 50 |
} |
| 51 |
|
| 52 |
/** |
| 53 |
* If the language code is not in agreement with the language of the content, |
| 54 |
* redirects incoming links to the proper URL to avoid duplicate content. |
| 55 |
* |
| 56 |
* @since 0.9.6 |
| 57 |
* |
| 58 |
* @global WP_Query $wp_query WordPress Query object. |
| 59 |
* @global bool $is_IIS |
| 60 |
* |
| 61 |
* @param string $requested_url Optional, defaults to requested url. |
| 62 |
* @param bool $do_redirect Optional, whether to perform the redirect or not. |
| 63 |
* @return string|void Returns if redirect is not performed. |
| 64 |
*/ |
| 65 |
public function check_canonical_url( $requested_url = '', $do_redirect = true ) { |
| 66 |
global $wp_query; |
| 67 |
|
| 68 |
// Don't redirect in same cases as WP. |
| 69 |
if ( is_trackback() || is_search() || is_admin() || is_preview() || is_robots() || ( $GLOBALS['is_IIS'] && ! iis7_supports_permalinks() ) ) { |
| 70 |
return; |
| 71 |
} |
| 72 |
|
| 73 |
// Don't redirect mysite.com/?attachment_id= to mysite.com/en/?attachment_id=. |
| 74 |
if ( 1 == $this->options['force_lang'] && is_attachment() && isset( $_GET['attachment_id'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification |
| 75 |
return; |
| 76 |
} |
| 77 |
|
| 78 |
/* |
| 79 |
* If the default language code is not hidden and the static front page url contains the page name, |
| 80 |
* the customizer lands here and the code below would redirect to the list of posts. |
| 81 |
*/ |
| 82 |
if ( is_customize_preview() ) { |
| 83 |
return; |
| 84 |
} |
| 85 |
|
| 86 |
if ( empty( $requested_url ) ) { |
| 87 |
$requested_url = pll_get_requested_url(); |
| 88 |
} |
| 89 |
|
| 90 |
if ( ( is_single() && ( ! is_attachment() || get_option( 'wp_attachment_pages_enabled' ) ) ) || ( is_page() && ! is_front_page() ) ) { |
| 91 |
$post = get_post(); |
| 92 |
if ( $post instanceof WP_Post && $this->model->is_translated_post_type( $post->post_type ) ) { |
| 93 |
$language = $this->model->post->get_language( (int) $post->ID ); |
| 94 |
} |
| 95 |
} |
| 96 |
|
| 97 |
if ( ! empty( $wp_query->tax_query ) ) { |
| 98 |
if ( $this->model->is_translated_taxonomy( $this->get_queried_taxonomy( $wp_query->tax_query ) ) ) { |
| 99 |
$term_id = $this->get_queried_term_id( $wp_query->tax_query ); |
| 100 |
if ( $term_id ) { |
| 101 |
$language = $this->model->term->get_language( $term_id ); |
| 102 |
} |
| 103 |
} |
| 104 |
} |
| 105 |
|
| 106 |
if ( $wp_query->is_posts_page ) { |
| 107 |
$page_id = get_query_var( 'page_id' ); |
| 108 |
if ( ! $page_id ) { |
| 109 |
$page_id = get_queried_object_id(); |
| 110 |
} |
| 111 |
if ( $page_id && is_numeric( $page_id ) ) { |
| 112 |
$language = $this->model->post->get_language( (int) $page_id ); |
| 113 |
} |
| 114 |
} |
| 115 |
|
| 116 |
if ( 3 === $this->options['force_lang'] ) { |
| 117 |
$requested_host = wp_parse_url( $requested_url, PHP_URL_HOST ); |
| 118 |
foreach ( $this->options['domains'] as $lang => $domain ) { |
| 119 |
$host = wp_parse_url( $domain, PHP_URL_HOST ); |
| 120 |
if ( $requested_host && $host && ltrim( $requested_host, 'w.' ) === ltrim( $host, 'w.' ) ) { |
| 121 |
$language = $this->model->get_language( $lang ); |
| 122 |
} |
| 123 |
} |
| 124 |
} |
| 125 |
|
| 126 |
if ( empty( $language ) ) { |
| 127 |
$language = $this->curlang; |
| 128 |
$redirect_url = $requested_url; |
| 129 |
} else { |
| 130 |
$redirect_url = $this->redirect_canonical( $requested_url, $language ); |
| 131 |
$redirect_url = $this->options['force_lang'] ? |
| 132 |
$this->links_model->switch_language_in_link( $redirect_url, $language ) : |
| 133 |
$this->links_model->remove_language_from_link( $redirect_url ); // Works only for default permalinks. |
| 134 |
} |
| 135 |
|
| 136 |
|
| 137 |
/** |
| 138 |
* Filters the canonical url detected by Polylang. |
| 139 |
* |
| 140 |
* @since 1.6 |
| 141 |
* |
| 142 |
* @param string|false $redirect_url False or the url to redirect to. |
| 143 |
* @param PLL_Language $language The language detected. |
| 144 |
*/ |
| 145 |
$redirect_url = apply_filters( 'pll_check_canonical_url', $redirect_url, $language ); |
| 146 |
|
| 147 |
if ( ! $redirect_url || $requested_url === $redirect_url ) { |
| 148 |
return $requested_url; |
| 149 |
} |
| 150 |
|
| 151 |
if ( ! $do_redirect ) { |
| 152 |
return $redirect_url; |
| 153 |
} |
| 154 |
|
| 155 |
// Protect against chained redirects. |
| 156 |
if ( $redirect_url === $this->check_canonical_url( $redirect_url, false ) && wp_validate_redirect( $redirect_url ) ) { |
| 157 |
wp_safe_redirect( $redirect_url, 301, POLYLANG ); |
| 158 |
exit; |
| 159 |
} |
| 160 |
} |
| 161 |
|
| 162 |
/** |
| 163 |
* Returns the term_id of the requested term. |
| 164 |
* |
| 165 |
* @since 2.9 |
| 166 |
* |
| 167 |
* @param WP_Tax_Query $tax_query An instance of WP_Tax_Query. |
| 168 |
* @return int |
| 169 |
*/ |
| 170 |
protected function get_queried_term_id( $tax_query ) { |
| 171 |
$queried_terms = $tax_query->queried_terms; |
| 172 |
$taxonomy = $this->get_queried_taxonomy( $tax_query ); |
| 173 |
|
| 174 |
if ( ! isset( $queried_terms[ $taxonomy ]['terms'] ) || ! is_array( $queried_terms[ $taxonomy ]['terms'] ) ) { |
| 175 |
return 0; |
| 176 |
} |
| 177 |
|
| 178 |
if ( ! isset( $queried_terms[ $taxonomy ]['field'] ) ) { |
| 179 |
return 0; |
| 180 |
} |
| 181 |
|
| 182 |
$field = $queried_terms[ $taxonomy ]['field']; |
| 183 |
$term = reset( $queried_terms[ $taxonomy ]['terms'] ); |
| 184 |
$lang = isset( $queried_terms['language']['terms'] ) ? reset( $queried_terms['language']['terms'] ) : ''; |
| 185 |
|
| 186 |
// We can get a term_id when requesting a plain permalink, eg /?cat=1. |
| 187 |
if ( 'term_id' === $field ) { |
| 188 |
return $term; |
| 189 |
} |
| 190 |
|
| 191 |
// We get a slug when requesting a pretty permalink. Let's query all corresponding terms. |
| 192 |
$args = array( |
| 193 |
'lang' => '', |
| 194 |
'taxonomy' => $taxonomy, |
| 195 |
$field => $term, |
| 196 |
'hide_empty' => false, |
| 197 |
'fields' => 'ids', |
| 198 |
); |
| 199 |
$term_ids = get_terms( $args ); |
| 200 |
|
| 201 |
if ( ! is_array( $term_ids ) || empty( $term_ids ) ) { |
| 202 |
return 0; |
| 203 |
} |
| 204 |
|
| 205 |
$term_ids = array_filter( $term_ids, 'is_numeric' ); |
| 206 |
|
| 207 |
$filtered_terms_by_lang = array_filter( |
| 208 |
$term_ids, |
| 209 |
function ( $term_id ) use ( $lang ) { |
| 210 |
$term_lang = $this->model->term->get_language( (int) $term_id ); |
| 211 |
|
| 212 |
return ! empty( $term_lang ) && $term_lang->slug === $lang; |
| 213 |
} |
| 214 |
); |
| 215 |
|
| 216 |
$tr_term = (int) reset( $filtered_terms_by_lang ); |
| 217 |
|
| 218 |
if ( ! empty( $tr_term ) ) { |
| 219 |
// The queried term exists in the desired language. |
| 220 |
return $tr_term; |
| 221 |
} |
| 222 |
|
| 223 |
// The queried term doesn't exist in the desired language, let's return the first one retrieved. |
| 224 |
return (int) reset( $term_ids ); |
| 225 |
} |
| 226 |
|
| 227 |
/** |
| 228 |
* Find the taxonomy being queried. |
| 229 |
* |
| 230 |
* @since 2.9 |
| 231 |
* |
| 232 |
* @param WP_Tax_Query $tax_query An instance of WP_Tax_Query. |
| 233 |
* @return string A taxonomy slug |
| 234 |
*/ |
| 235 |
protected function get_queried_taxonomy( $tax_query ) { |
| 236 |
$queried_terms = $tax_query->queried_terms; |
| 237 |
unset( $queried_terms['language'] ); |
| 238 |
|
| 239 |
return (string) key( $queried_terms ); |
| 240 |
} |
| 241 |
|
| 242 |
/** |
| 243 |
* Evaluates the canonical redirect url through the deidcated WP function. |
| 244 |
* |
| 245 |
* @since 3.3 |
| 246 |
* |
| 247 |
* @global WP_Query $wp_query WordPress Query object. |
| 248 |
* |
| 249 |
* @param string $url Requested url. |
| 250 |
* @param PLL_Language $language Language of the queried object. |
| 251 |
* @return string |
| 252 |
*/ |
| 253 |
protected function redirect_canonical( $url, $language ) { |
| 254 |
/** |
| 255 |
* @var WP_Query |
| 256 |
*/ |
| 257 |
global $wp_query; |
| 258 |
|
| 259 |
$this->curlang = $language; // Hack to filter the `page_for_posts` option in the correct language. |
| 260 |
|
| 261 |
$backup_wp_query = $wp_query; |
| 262 |
|
| 263 |
if ( isset( $wp_query->tax_query ) ) { |
| 264 |
unset( $wp_query->tax_query->queried_terms['language'] ); |
| 265 |
unset( $wp_query->query['lang'] ); |
| 266 |
} |
| 267 |
|
| 268 |
$redirect_url = redirect_canonical( $url, false ); |
| 269 |
|
| 270 |
$wp_query = $backup_wp_query; |
| 271 |
|
| 272 |
return $redirect_url ?: $url; |
| 273 |
} |
| 274 |
} |
| 275 |
|
