ENGCOM-5267: Fixed #22266: 404 message for product alerts when not logged in #23218

 - Merge Pull Request #23218 from ArjenMiedema/magento2:bugfix/22266-fix-404-for-product-alerts
 - Merged commits:
   1. 361965b

Author: magento-engcom-team

app/code/Magento/ProductAlert/Controller/Add/Price.php

@@ -6,7 +6,7 @@
 
 namespace Magento\ProductAlert\Controller\Add;
 
-use Magento\Framework\App\Action\HttpPostActionInterface;
+use Magento\Framework\App\Action\HttpGetActionInterface;
 use Magento\ProductAlert\Controller\Add as AddController;
 use Magento\Framework\App\Action\Context;
 use Magento\Customer\Model\Session as CustomerSession;
@@ -20,7 +20,7 @@
 /**
  * Controller for notifying about price.
  */
-class Price extends AddController implements HttpPostActionInterface
+class Price extends AddController implements HttpGetActionInterface
 {
     /**
      * @var \Magento\Store\Model\StoreManagerInterface

app/code/Magento/ProductAlert/Controller/Add/Stock.php

@@ -6,7 +6,7 @@
 
 namespace Magento\ProductAlert\Controller\Add;
 
-use Magento\Framework\App\Action\HttpPostActionInterface;
+use Magento\Framework\App\Action\HttpGetActionInterface;
 use Magento\ProductAlert\Controller\Add as AddController;
 use Magento\Framework\App\Action\Context;
 use Magento\Customer\Model\Session as CustomerSession;
@@ -19,7 +19,7 @@
 /**
  * Controller for notifying about stock.
  */
-class Stock extends AddController implements HttpPostActionInterface
+class Stock extends AddController implements HttpGetActionInterface
 {
     /**
      * @var \Magento\Catalog\Api\ProductRepositoryInterface

app/code/Magento/ProductAlert/view/frontend/templates/product/view.phtml

@@ -6,7 +6,7 @@
 ?>
 <?php /* @var $block \Magento\ProductAlert\Block\Product\View */?>
 <div class="product alert <?= $block->getHtmlClass() ?>">
-    <a href="#" data-post='<?= /* @noEscape */ $block->getPostAction() ?>'
+    <a href="<?= $block->escapeUrl($block->getSignupUrl()) ?>"
        title="<?= $block->escapeHtml(__($block->getSignupLabel())) ?>" class="action alert">
         <?= $block->escapeHtml(__($block->getSignupLabel())) ?>
     </a>