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wp-content/plugins/polylang/integrations/domain-mapping/domain-mapping.php

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+<?php
+/**
+ * @package Polylang
+ */
+
+/**
+ * Manages the compatibility with WordPress MU Domain Mapping.
+ *
+ * @since 2.8
+ */
+class PLL_Domain_Mapping {
+
+	/**
+	 * Setups actions.
+	 *
+	 * @since 2.8
+	 */
+	public function __construct() {
+		if ( function_exists( 'redirect_to_mapped_domain' ) ) {
+			if ( ! defined( 'PLL_CACHE_HOME_URL' ) && ( $options = get_option( 'polylang' ) ) && $options['force_lang'] < 2 ) {
+				define( 'PLL_CACHE_HOME_URL', false );
+			}
+
+			if ( ! get_site_option( 'dm_no_primary_domain' ) ) {
+				remove_action( 'template_redirect', 'redirect_to_mapped_domain' );
+				add_action( 'template_redirect', array( $this, 'dm_redirect_to_mapped_domain' ) );
+			}
+		}
+	}
+
+	/**
+	 * Fix primary domain check which forces only one domain per blog.
+	 * Accept only known domains/subdomains for the current blog.
+	 *
+	 * @since 2.2
+	 */
+	public function dm_redirect_to_mapped_domain() {
+		$options = get_option( 'polylang' );
+
+		// The language is set from the subdomain or domain name
+		if ( $options['force_lang'] > 1 ) {
+			// Don't go further if we stopped loading the plugin early ( for example when deactivate-polylang=1 ).
+			if ( ! function_exists( 'PLL' ) ) {
+				return;
+			}
+
+			// Don't redirect the main site
+			if ( is_main_site() ) {
+				return;
+			}
+
+			// Don't redirect post previews
+			if ( isset( $_GET['preview'] ) && 'true' === $_GET['preview'] ) { // phpcs:ignore WordPress.Security.NonceVerification
+				return;
+			}
+
+			// Don't redirect theme customizer
+			if ( isset( $_POST['customize'] ) && isset( $_POST['theme'] ) && 'on' === $_POST['customize'] ) { // phpcs:ignore WordPress.Security.NonceVerification
+				return;
+			}
+
+			// If we can't associate the requested domain to a language, redirect to the default domain
+			$requested_url  = pll_get_requested_url();
+			$requested_host = wp_parse_url( $requested_url, PHP_URL_HOST );
+
+			$hosts = PLL()->links_model->get_hosts();
+			$lang  = array_search( $requested_host, $hosts );
+
+			if ( empty( $lang ) ) {
+				$status   = get_site_option( 'dm_301_redirect' ) ? '301' : '302'; // Honor status redirect option
+				$redirect = str_replace( '://' . $requested_host, '://' . $hosts[ $options['default_lang'] ], $requested_url );
+				wp_safe_redirect( $redirect, $status );
+				exit;
+			}
+		} else {
+			// Otherwise rely on MU Domain Mapping
+			redirect_to_mapped_domain();
+		}
+	}
+}