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<?php

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/**

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* Class WPML_Canonicals_Hooks

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class WPML_Canonicals_Hooks {

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/** @var SitePress $sitepress */

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private $sitepress;

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/** @var WPML_URL_Converter $url_converter */

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private $url_converter;

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/** @var callable $is_current_request_root_callback */

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private $is_current_request_root_callback;

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/**

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* WPML_Canonicals_Hooks constructor.

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* @param SitePress $sitepress

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* @param WPML_URL_Converter $url_converter

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* @param callable $is_current_request_root_callback

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public function __construct( SitePress $sitepress, WPML_URL_Converter $url_converter, $is_current_request_root_callback ) {

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$this->sitepress = $sitepress;

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$this->url_converter = $url_converter;

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$this->is_current_request_root_callback = $is_current_request_root_callback;

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}

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public function add_hooks() {

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$urls = $this->sitepress->get_setting( 'urls' );

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$lang_negotiation = (int) $this->sitepress->get_setting( 'language_negotiation_type' );

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if ( WPML_LANGUAGE_NEGOTIATION_TYPE_DIRECTORY === $lang_negotiation

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&& ! empty( $urls['directory_for_default_language'] )

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) {

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add_action( 'template_redirect', array( $this, 'redirect_pages_from_root_to_default_lang_dir' ) );

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} elseif ( WPML_LANGUAGE_NEGOTIATION_TYPE_PARAMETER === $lang_negotiation ) {

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add_action( 'redirect_canonical', array( $this, 'prevent_redirection_with_translated_paged_content' ) );

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}

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if ( isset( $_SERVER['SERVER_SOFTWARE'] ) && strpos( strtolower( $_SERVER['SERVER_SOFTWARE'] ), 'nginx' ) !== false ) {

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add_action( 'redirect_canonical', array( $this, 'maybe_fix_nginx_redirection_callback' ) );

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}

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}

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public function redirect_pages_from_root_to_default_lang_dir() {

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if ( is_page() && ! call_user_func( $this->is_current_request_root_callback ) ) {

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$lang = $this->sitepress->get_current_language();

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$current_uri = $_SERVER['REQUEST_URI'];

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$abs_home = $this->url_converter->get_abs_home();

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$install_subdir = wpml_parse_url( $abs_home, PHP_URL_PATH );

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$actual_uri = preg_replace( '#^' . $install_subdir . '#', '', $current_uri );

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$actual_uri = '/' . ltrim( $actual_uri, '/' );

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if ( 0 !== strpos( $actual_uri, '/' . $lang . '/' ) ) {

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$canonical_uri = trailingslashit( $install_subdir ) . $lang . $actual_uri;

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$canonical_uri = user_trailingslashit( $canonical_uri );

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$this->sitepress->get_wp_api()->wp_safe_redirect( $canonical_uri, 301 );

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}

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}

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}

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/**

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* @param string $redirect

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* @return bool|string

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public function maybe_fix_nginx_redirection_callback( $redirect ) {

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if ( is_front_page() ) {

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$redirect = false;

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}

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return $redirect;

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}

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/**

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* @param string $redirect_url

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* @return string|false

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public function prevent_redirection_with_translated_paged_content( $redirect_url ) {

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if ( ! is_singular() || ! isset( $_GET['lang'] ) ) {

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return $redirect_url;

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}

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$page = (int) get_query_var( 'page' );

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if ( $page < 2 ) {

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return $redirect_url;

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}

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return false;

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}

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}

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