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wp-content/plugins/sitepress-multilingual-cms/classes/canonicals/class-wpml-canonicals-hooks.php

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+<?php
+
+/**
+ * Class WPML_Canonicals_Hooks
+ */
+class WPML_Canonicals_Hooks {
+
+	/** @var SitePress $sitepress */
+	private $sitepress;
+
+	/** @var  WPML_URL_Converter $url_converter */
+	private $url_converter;
+
+	/** @var callable $is_current_request_root_callback */
+	private $is_current_request_root_callback;
+
+	/**
+	 * WPML_Canonicals_Hooks constructor.
+	 *
+	 * @param SitePress          $sitepress
+	 * @param WPML_URL_Converter $url_converter
+	 * @param callable           $is_current_request_root_callback
+	 */
+	public function __construct( SitePress $sitepress, WPML_URL_Converter $url_converter, $is_current_request_root_callback ) {
+		$this->sitepress                        = $sitepress;
+		$this->url_converter                    = $url_converter;
+		$this->is_current_request_root_callback = $is_current_request_root_callback;
+	}
+
+	public function add_hooks() {
+		$urls             = $this->sitepress->get_setting( 'urls' );
+		$lang_negotiation = (int) $this->sitepress->get_setting( 'language_negotiation_type' );
+
+		if ( WPML_LANGUAGE_NEGOTIATION_TYPE_DIRECTORY === $lang_negotiation
+			 && ! empty( $urls['directory_for_default_language'] )
+		) {
+			add_action( 'template_redirect', array( $this, 'redirect_pages_from_root_to_default_lang_dir' ) );
+		} elseif ( WPML_LANGUAGE_NEGOTIATION_TYPE_PARAMETER === $lang_negotiation ) {
+			add_action( 'redirect_canonical', array( $this, 'prevent_redirection_with_translated_paged_content' ) );
+		}
+
+		if ( isset( $_SERVER['SERVER_SOFTWARE'] ) && strpos( strtolower( $_SERVER['SERVER_SOFTWARE'] ), 'nginx' ) !== false ) {
+			add_action( 'redirect_canonical', array( $this, 'maybe_fix_nginx_redirection_callback' ) );
+		}
+	}
+
+	public function redirect_pages_from_root_to_default_lang_dir() {
+		global $wp_query;
+
+		if ( ( $wp_query->is_page() || $wp_query->is_posts_page ) && ! call_user_func( $this->is_current_request_root_callback ) ) {
+			$lang           = $this->sitepress->get_current_language();
+			$current_uri    = $_SERVER['REQUEST_URI'];
+			$abs_home       = $this->url_converter->get_abs_home();
+			$install_subdir = wpml_parse_url( $abs_home, PHP_URL_PATH );
+			$actual_uri     = preg_replace( '#^' . $install_subdir . '#', '', $current_uri );
+			$actual_uri     = '/' . ltrim( $actual_uri, '/' );
+
+			if ( 0 !== strpos( $actual_uri, '/' . $lang ) ) {
+				$canonical_uri = trailingslashit( $install_subdir ) . $lang . $actual_uri;
+				$canonical_uri = user_trailingslashit( $canonical_uri );
+				$this->sitepress->get_wp_api()->wp_safe_redirect( $canonical_uri, 301 );
+			}
+		}
+	}
+
+	/**
+	 * @param string $redirect
+	 *
+	 * @return bool|string
+	 */
+	public function maybe_fix_nginx_redirection_callback( $redirect ) {
+		if ( is_front_page() ) {
+			$redirect = false;
+		}
+
+		return $redirect;
+	}
+
+	/**
+	 * @param string $redirect_url
+	 *
+	 * @return string|false
+	 */
+	public function prevent_redirection_with_translated_paged_content( $redirect_url ) {
+		if ( ! is_singular() || ! isset( $_GET['lang'] ) ) {
+			return $redirect_url;
+		}
+
+		$page = (int) get_query_var( 'page' );
+
+		if ( $page < 2 ) {
+			return $redirect_url;
+		}
+
+		return false;
+	}
+}

wp-content/plugins/sitepress-multilingual-cms/classes/canonicals/class-wpml-canonicals.php

@@ -0,0 +1,206 @@
+<?php
+
+/**
+ * @author OnTheGo Systems
+ */
+class WPML_Canonicals {
+	const CANONICAL_FOR_DUPLICATED_POST       = 'duplicate';
+	const CANONICAL_FOR_NON_TRANSLATABLE_POST = 'non-translatable';
+	/** @var SitePress */
+	private $sitepress;
+	/** @var WPML_Translations */
+	private $wpml_translations;
+	/** @var WPML_Translation_Element_Factory  */
+	private $translation_element_factory;
+
+	/**
+	 * WPML_Canonicals constructor.
+	 *
+	 * @param SitePress                        $sitepress
+	 * @param WPML_Translation_Element_Factory $translation_element_factory
+	 * @param WPML_Translations                $wpml_translations
+	 */
+	public function __construct(
+		SitePress $sitepress,
+		WPML_Translation_Element_Factory $translation_element_factory,
+		WPML_Translations $wpml_translations = null
+	) {
+		$this->sitepress                   = $sitepress;
+		$this->translation_element_factory = $translation_element_factory;
+		$this->wpml_translations           = $wpml_translations;
+	}
+
+	/**
+	 * @param int $post_id
+	 *
+	 * @return bool|string
+	 * @throws \InvalidArgumentException
+	 */
+	private function must_filter_permalink( $post_id ) {
+		$this->init_wpml_translations();
+		$post_element           = $this->translation_element_factory->create( $post_id, 'post' );
+		$must_handle_canonicals = $this->must_handle_a_canonical_url();
+
+		if ( $post_element->is_translatable() ) {
+			if ( $must_handle_canonicals && $this->wpml_translations->is_a_duplicate_of( $post_element ) && $this->is_permalink_filter_from_rel_canonical() ) {
+				return self::CANONICAL_FOR_DUPLICATED_POST;
+			}
+		} elseif ( $must_handle_canonicals ) {
+			return self::CANONICAL_FOR_NON_TRANSLATABLE_POST;
+		}
+
+		return false;
+	}
+
+	/**
+	 * @param string $link
+	 * @param int    $post_id
+	 *
+	 * @return null|string
+	 * @throws \InvalidArgumentException
+	 */
+	public function permalink_filter( $link, $post_id ) {
+		switch ( $this->must_filter_permalink( $post_id ) ) {
+			case self::CANONICAL_FOR_DUPLICATED_POST:
+				$post_element = $this->translation_element_factory->create( $post_id, 'post' );
+
+				return $this->get_canonical_of_duplicate( $post_element );
+
+			case self::CANONICAL_FOR_NON_TRANSLATABLE_POST:
+				return $this->get_url_in_default_language_if_rel_canonical( $link );
+
+			default:
+				return null;
+		}
+	}
+
+	/**
+	 * @param string  $canonical_url
+	 * @param WP_Post $post
+	 *
+	 * @return string|bool
+	 */
+	public function get_canonical_url( $canonical_url, $post, $request_language ) {
+		if ( $post && $this->sitepress->get_wp_api()->is_front_end() ) {
+			try {
+				/** @var WPML_Post_Element $post_element */
+				$post_element = $this->translation_element_factory->create( $post->ID, 'post' );
+
+				$should_translate_canonical_url = apply_filters(
+					'wpml_must_translate_canonical_url',
+					true,
+					$post_element
+				);
+
+				if ( ! $should_translate_canonical_url ) {
+					return $canonical_url;
+				}
+
+				if ( ! $post_element->is_translatable() ) {
+					global $wpml_url_filters;
+					$wpml_url_filters->remove_global_hooks();
+					$canonical_url = $this->sitepress->convert_url_string( $canonical_url, $this->sitepress->get_default_language() );
+					$wpml_url_filters->add_global_hooks();
+				} else {
+					$this->init_wpml_translations();
+					if ( $this->wpml_translations->is_a_duplicate_of( $post_element ) ) {
+						$canonical_url = (string) $this->get_canonical_of_duplicate( $post_element );
+					} elseif ( $post_element->get_language_code() != $request_language ) {
+						$canonical_url = $this->sitepress->convert_url_string( $canonical_url, $post_element->get_language_code() );
+					}
+				}
+			} catch ( InvalidArgumentException $e ) {
+			}
+		}
+
+		return $canonical_url;
+	}
+
+	/**
+	 * @param string $url
+	 *
+	 * @return string
+	 */
+	public function get_general_canonical_url( $url ) {
+		global $wpml_url_filters;
+		$wpml_url_filters->remove_global_hooks();
+		$canonical_url = $this->sitepress->convert_url_string( $url, $this->sitepress->get_current_language() );
+		$wpml_url_filters->add_global_hooks();
+
+		return $canonical_url;
+	}
+
+	private function has_wp_get_canonical_url() {
+		return $this->sitepress->get_wp_api()->function_exists( 'wp_get_canonical_url' );
+	}
+
+	/**
+	 * @return bool
+	 */
+	private function is_permalink_filter_from_rel_canonical() {
+		$back_trace_stack = $this->sitepress->get_wp_api()->get_backtrace( 20 );
+		$keywords         = array( 'rel_canonical', 'canonical', 'generate_canonical' );
+
+		$result = false;
+		if ( $back_trace_stack ) {
+			foreach ( $back_trace_stack as $key => $value ) {
+				foreach ( $keywords as $keyword ) {
+					if ( 'function' === $key && $keyword === $value ) {
+						$result = true;
+						break;
+					}
+				}
+			}
+		}
+
+		return $result;
+	}
+
+	/**
+	 * @param string $link
+	 *
+	 * @return bool|string
+	 */
+	private function get_url_in_default_language_if_rel_canonical( $link ) {
+		if ( $this->is_permalink_filter_from_rel_canonical() ) {
+			$default_language = $this->sitepress->get_default_language();
+			$link             = (string) $this->sitepress->convert_url( $link, $default_language );
+		}
+
+		return $link;
+	}
+
+	/**
+	 * @param WPML_Post_Element $post_element
+	 *
+	 * @return false|string
+	 */
+	private function get_canonical_of_duplicate( $post_element ) {
+		$source_element = $post_element->get_source_element();
+		if ( $source_element ) {
+			$source_element_id    = $source_element->get_id();
+			$source_language_code = $source_element->get_language_code();
+			$current_language     = $this->sitepress->get_current_language();
+			$this->sitepress->switch_lang( $source_language_code );
+			$new_link = get_permalink( $source_element_id );
+			$this->sitepress->switch_lang( $current_language );
+		} else {
+			$new_link = get_permalink( $post_element->get_id() );
+		}
+
+		return $new_link;
+	}
+
+	/**
+	 * @return bool
+	 */
+	private function must_handle_a_canonical_url() {
+		return ! $this->has_wp_get_canonical_url() && $this->sitepress->get_wp_api()->is_front_end();
+	}
+
+	private function init_wpml_translations() {
+		if ( ! $this->wpml_translations ) {
+			$this->wpml_translations = new WPML_Translations( $this->sitepress );
+		}
+	}
+}