Declare the sitemaps of every shop in robots.txt on multistore

config.xml

@@ -2,7 +2,7 @@
 <module>
     <name>gsitemap</name>
     <displayName><![CDATA[Google sitemap]]></displayName>
-    <version><![CDATA[5.0.0]]></version>
+    <version><![CDATA[5.1.0]]></version>
     <description><![CDATA[Generates an XML sitemap for your shop and keeps it up to date. Compatible with all major search engines.]]></description>
     <author><![CDATA[PrestaShop]]></author>
     <tab><![CDATA[seo]]></tab>

gsitemap.php

@@ -60,7 +60,7 @@ public function __construct()
     {
         $this->name = 'gsitemap';
         $this->tab = 'checkout';
-        $this->version = '5.0.0';
+        $this->version = '5.1.0';
         $this->author = 'PrestaShop';
         $this->need_instance = 0;
         $this->bootstrap = true;
@@ -190,7 +190,8 @@ public function install()
         }
 
         return parent::install()
-            && Db::getInstance()->Execute('CREATE TABLE IF NOT EXISTS `' . _DB_PREFIX_ . 'gsitemap_sitemap` (`link` varchar(255) DEFAULT NULL, `id_shop` int(11) DEFAULT 0) ENGINE=' . _MYSQL_ENGINE_ . ' DEFAULT CHARSET=utf8;') && $this->installHook();
+            && Db::getInstance()->Execute('CREATE TABLE IF NOT EXISTS `' . _DB_PREFIX_ . 'gsitemap_sitemap` (`link` varchar(255) DEFAULT NULL, `id_shop` int(11) DEFAULT 0) ENGINE=' . _MYSQL_ENGINE_ . ' DEFAULT CHARSET=utf8;') && $this->installHook()
+            && $this->registerHook('actionAdminMetaAfterWriteRobotsFile');
     }
 
     /**
@@ -320,6 +321,58 @@ public function getContent()
         return $this->display(__FILE__, 'views/templates/admin/configuration.tpl');
     }
 
+    /**
+     * Declares the sitemaps of the remaining shops in robots.txt.
+     *
+     * The core writes a Sitemap line for the shop currently in context only, while a
+     * multistore installation serves one robots.txt file to every domain. Without this,
+     * the sitemaps of the other shops are not declared anywhere.
+     *
+     * @param array $params
+     *
+     * @return void
+     */
+    public function hookActionAdminMetaAfterWriteRobotsFile($params)
+    {
+        if (!Shop::isFeatureActive() || empty($params['write_fd']) || !is_resource($params['write_fd'])) {
+            return;
+        }
+
+        $idShopInContext = (int) $this->context->shop->id;
+
+        foreach (array_keys(Shop::getShops(true)) as $idShop) {
+            $idShop = (int) $idShop;
+
+            // The core already declared this one.
+            if ($idShop === $idShopInContext) {
+                continue;
+            }
+
+            $filename = $idShop . '_index_sitemap.xml';
+            $sitemapFile = $this->normalizeDirectory(_PS_ROOT_DIR_) . $filename;
+            if (!file_exists($sitemapFile) || !filesize($sitemapFile)) {
+                continue;
+            }
+
+            $shop = new Shop($idShop);
+            if (!Validate::isLoadedObject($shop)) {
+                continue;
+            }
+
+            // Each shop has its own domain and can have its own SSL setting.
+            $useSsl = (bool) Configuration::get('PS_SSL_ENABLED', null, null, $idShop);
+            $domain = $useSsl ? $shop->domain_ssl : $shop->domain;
+            if (empty($domain)) {
+                continue;
+            }
+
+            fwrite(
+                $params['write_fd'],
+                'Sitemap: ' . Tools::getProtocol($useSsl) . $domain . $shop->getBaseURI() . $filename . PHP_EOL
+            );
+        }
+    }
+
     /**
      * Delete all the generated sitemap files from the files system and the database.
      *

upgrade/upgrade-5.1.0.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * Copyright since 2007 PrestaShop SA and Contributors
+ * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Academic Free License 3.0 (AFL-3.0)
+ * that is bundled with this package in the file LICENSE.md.
+ * It is also available through the world-wide-web at this URL:
+ * https://opensource.org/licenses/AFL-3.0
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@prestashop.com so we can send you a copy immediately.
+ *
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
+ * versions in the future. If you wish to customize PrestaShop for your
+ * needs please refer to https://devdocs.prestashop.com/ for more information.
+ *
+ * @author    PrestaShop SA and Contributors <contact@prestashop.com>
+ * @copyright Since 2007 PrestaShop SA and Contributors
+ * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License 3.0 (AFL-3.0)
+ */
+if (!defined('_PS_VERSION_')) {
+    exit;
+}
+
+function upgrade_module_5_1_0($object)
+{
+    return $object->registerHook('actionAdminMetaAfterWriteRobotsFile');
+}