first commit

wp-content/plugins/sitepress-multilingual-cms/classes/language/Detection/Ajax.php

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+<?php
+
+namespace WPML\Language\Detection;
+
+use WPML\FP\Maybe;
+use WPML\FP\Obj;
+use WPML\FP\Lst;
+use WPML\FP\Str;
+use WPML\FP\Fns;
+use \WPML_Request;
+
+class Ajax extends WPML_Request {
+
+	public function get_requested_lang() {
+		return Maybe::of( $_REQUEST )
+					->map( Obj::prop( 'lang' ) )
+					->filter( Lst::includes( Fns::__, $this->active_languages ) )
+					->map( 'sanitize_text_field' )
+					->getOrElse(
+						function () {
+							return $this->get_cookie_lang();
+						}
+					);
+	}
+
+	protected function get_cookie_name() {
+		return $this->cookieLanguage->getAjaxCookieName( $this->is_admin_action_from_referer() );
+	}
+
+	/**
+	 * @return bool
+	 */
+	private function is_admin_action_from_referer() {
+		return (bool) Maybe::of( $_SERVER )
+						   ->map( Obj::prop( 'HTTP_REFERER' ) )
+						   ->map( Str::pos( '/wp-admin/' ) )
+						   ->getOrElse( false );
+	}
+}

wp-content/plugins/sitepress-multilingual-cms/classes/language/Detection/Backend.php

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+<?php
+
+namespace WPML\Language\Detection;
+
+use WPML\FP\Fns;
+use WPML\FP\Logic;
+use WPML\FP\Maybe;
+use WPML\FP\Obj;
+use WPML\FP\Relation;
+use function WPML\FP\System\filterVar;
+use function \WPML\FP\partialRight;
+
+/**
+ * Class WPML_Backend_Request
+ *
+ * @package    wpml-core
+ * @subpackage wpml-requests
+ */
+class Backend extends \WPML_Request {
+	/**
+	 * Determines the requested language in the WP Admin backend from URI, $_POST, $_GET and cookies.
+	 *
+	 * @return string The requested language code.
+	 */
+	public function get_requested_lang() {
+		$findFromSystemVars = Fns::until(
+			Logic::isNotNull(),
+			[
+				$this->getForPage(),
+				$this->getFromParam( [ 'get', 'lang' ], true ),
+				$this->getFromParam( [ 'post', 'icl_post_language' ], false ),
+				$this->getPostElementLanguage(),
+			]
+		);
+
+		return Maybe::of(
+			[
+				'get'  => $_GET,
+				'post' => $_POST,
+			]
+		)
+					->map( $findFromSystemVars )
+					->getOrElse(
+						function () {
+							return $this->get_cookie_lang();
+						}
+					);
+	}
+
+	private function getForPage() {
+		return function ( $system ) {
+			return $this->is_string_translation_or_translation_queue_page( $system ) ? $this->default_language : null;
+		};
+	}
+
+	protected function get_cookie_name() {
+		return $this->cookieLanguage->getBackendCookieName();
+	}
+
+	private function getFromParam( $path, $allowAllValue ) {
+		return function ( $system ) use ( $path, $allowAllValue ) {
+			/**  @var \WPML_Language_Resolution $wpml_language_resolution */
+			global $wpml_language_resolution;
+
+			return Maybe::of( $system )
+						->map( Obj::path( $path ) )
+						->map( filterVar( FILTER_SANITIZE_FULL_SPECIAL_CHARS ) )
+						->filter( partialRight( [ $wpml_language_resolution, 'is_language_active' ], $allowAllValue ) )
+						->getOrElse( null );
+		};
+	}
+
+	private function getPostElementLanguage() {
+		return function ( $system ) {
+			/** @var \WPML_Post_Translation $wpml_post_translations */
+			global $wpml_post_translations;
+
+			return Maybe::of( $system )
+						->map( Obj::path( [ 'get', 'p' ] ) )
+						->filter( Relation::gt( Fns::__, 0 ) )
+						->map( [ $wpml_post_translations, 'get_element_lang_code' ] )
+						->getOrElse( null );
+		};
+	}
+
+	private function is_string_translation_or_translation_queue_page( $system ) {
+		$page = Obj::path( [ 'get', 'page' ], $system );
+
+		return ( defined( 'WPML_ST_FOLDER' ) && $page === WPML_ST_FOLDER . '/menu/string-translation.php' )
+			   ||
+			   ( defined( 'WPML_TM_FOLDER' ) && $page === WPML_TM_FOLDER . '/menu/translations-queue.php' );
+	}
+}

wp-content/plugins/sitepress-multilingual-cms/classes/language/Detection/CookieLanguage.php

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+<?php
+
+namespace WPML\Language\Detection;
+
+class CookieLanguage {
+	/** @var \WPML_Cookie */
+	private $cookie;
+
+	/** @var string */
+	private $defaultLanguage;
+
+	/**
+	 * @param  \WPML_Cookie $cookie
+	 * @param  string       $defaultLanguage
+	 */
+	public function __construct( \WPML_Cookie $cookie, $defaultLanguage ) {
+		$this->cookie          = $cookie;
+		$this->defaultLanguage = $defaultLanguage;
+	}
+
+	/**
+	 * @param bool $isBackend
+	 *
+	 * @return string
+	 */
+	public function getAjaxCookieName( $isBackend ) {
+		return $isBackend ? $this->getBackendCookieName() : $this->getFrontendCookieName();
+	}
+
+	public function getBackendCookieName() {
+		return 'wp-wpml_current_admin_language_' . md5( $this->get_cookie_domain() );
+	}
+
+	public function getFrontendCookieName() {
+		return 'wp-wpml_current_language';
+	}
+
+	public function get( $cookieName ) {
+		global $wpml_language_resolution;
+
+		$cookie_value = esc_attr( $this->cookie->get_cookie( $cookieName ) );
+		$lang         = $cookie_value ? substr( $cookie_value, 0, 10 ) : null;
+		$lang         = $wpml_language_resolution->is_language_active( $lang ) ? $lang : $this->defaultLanguage;
+
+		return $lang;
+	}
+
+
+	public function set( $cookieName, $lang_code ) {
+		global $sitepress;
+
+		if ( is_user_logged_in() ) {
+			if ( ! $this->cookie->headers_sent() ) {
+				if ( preg_match(
+					'@\.(css|js|png|jpg|gif|jpeg|bmp|ico)@i',
+					basename( preg_replace( '@\?.*$@', '', $_SERVER['REQUEST_URI'] ) )
+				)
+					 || isset( $_POST['icl_ajx_action'] ) || isset( $_POST['_ajax_nonce'] ) || defined( 'DOING_AJAX' )
+				) {
+					return;
+				}
+
+				$current_cookie_value = $this->cookie->get_cookie( $cookieName );
+				if ( ! $current_cookie_value || $current_cookie_value !== $lang_code ) {
+					$cookie_domain = $this->get_cookie_domain();
+					$cookie_path   = defined( 'COOKIEPATH' ) ? COOKIEPATH : '/';
+					$this->cookie->set_cookie(
+						$cookieName,
+						$lang_code,
+						time() + DAY_IN_SECONDS,
+						$cookie_path,
+						$cookie_domain
+					);
+				}
+			}
+		} elseif ( $sitepress->get_setting( \WPML_Cookie_Setting::COOKIE_SETTING_FIELD ) ) {
+			$wpml_cookie_scripts = new \WPML_Cookie_Scripts( $cookieName, $sitepress->get_current_language() );
+			$wpml_cookie_scripts->add_hooks();
+		}
+
+		$_COOKIE[ $cookieName ] = $lang_code;
+
+		do_action( 'wpml_language_cookie_added', $lang_code );
+	}
+
+	/**
+	 * @return bool|string
+	 */
+	public function get_cookie_domain() {
+
+		return defined( 'COOKIE_DOMAIN' ) ? COOKIE_DOMAIN : self::get_server_host_name();
+	}
+
+	/**
+	 * Returns SERVER_NAME, or HTTP_HOST if the first is not available
+	 *
+	 * @return string
+	 */
+	private static function get_server_host_name() {
+		$host = '';
+		if ( isset( $_SERVER['HTTP_HOST'] ) ) {
+			$host = $_SERVER['HTTP_HOST'];
+		} elseif ( isset( $_SERVER['SERVER_NAME'] ) ) {
+			$host = $_SERVER['SERVER_NAME'] . self::get_port();
+			// Removes standard ports 443 (80 should be already omitted in all cases)
+			$host = preg_replace( '@:[443]+([/]?)@', '$1', $host );
+		}
+
+		return $host;
+	}
+
+	private static function get_port() {
+		return isset( $_SERVER['SERVER_PORT'] ) && ! in_array( $_SERVER['SERVER_PORT'], [ 80, 443 ] )
+			? ':' . $_SERVER['SERVER_PORT']
+			: '';
+	}
+}

wp-content/plugins/sitepress-multilingual-cms/classes/language/Detection/Frontend.php

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+<?php
+
+namespace WPML\Language\Detection;
+
+use WPML\FP\Maybe;
+use WPML\FP\Obj;
+use \WPML_Request;
+use \WPML_WP_Comments;
+use function WPML\FP\System\filterVar;
+
+/**
+ * @package    wpml-core
+ * @subpackage wpml-requests
+ */
+class Frontend extends WPML_Request {
+	/** @var \WPML_WP_API */
+	private $wp_api;
+
+	public function __construct(
+		\WPML_URL_Converter $url_converter,
+		$active_languages,
+		$default_language,
+		CookieLanguage $cookieLanguage,
+		\WPML_WP_API $wp_api
+	) {
+		parent::__construct( $url_converter, $active_languages, $default_language, $cookieLanguage );
+		$this->wp_api = $wp_api;
+	}
+
+
+	public function get_requested_lang() {
+		return $this->wp_api->is_comments_post_page() ? $this->get_comment_language() : $this->get_request_uri_lang();
+	}
+
+	/**
+	 * @return string
+	 */
+	private function get_comment_language() {
+		return Maybe::of( $_POST )
+					->map( Obj::prop( WPML_WP_Comments::LANG_CODE_FIELD ) )
+					->map( filterVar( FILTER_SANITIZE_SPECIAL_CHARS ) )
+					->getOrElse( $this->default_language );
+
+	}
+
+	protected function get_cookie_name() {
+		return $this->cookieLanguage->getFrontendCookieName();
+	}
+}

wp-content/plugins/sitepress-multilingual-cms/classes/language/Detection/Rest.php

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+<?php
+
+namespace WPML\Language\Detection;
+
+use \WPML_Request;
+
+class Rest extends WPML_Request {
+	/** @var Backend */
+	private $backend;
+
+	public function __construct(
+		$url_converter,
+		$active_languages,
+		$default_language,
+		$cookieLanguage,
+		$backend
+	) {
+		parent::__construct( $url_converter, $active_languages, $default_language, $cookieLanguage );
+		$this->backend = $backend;
+	}
+
+
+	protected function get_cookie_name() {
+		return $this->cookieLanguage->getAjaxCookieName( ! $this->getFrontendLanguage() );
+	}
+
+	public function get_requested_lang() {
+		return $this->getFrontendLanguage() ?: $this->backend->get_requested_lang();
+	}
+
+	/**
+	 * It tries to detect language in FRONTEND manner.
+	 *
+	 * We ignore a default language due to fallback mechanism in WPML_URL_Converter_Subdir_Strategy which never returns
+	 * NULL when `use_directory_for_default_lang` option is enabled.
+	 *
+	 * @return string|null
+	 */
+	private function getFrontendLanguage() {
+		$language = $this->get_request_uri_lang();
+
+		return $language && $language !== $this->default_language ? $language : null;
+	}
+}