FIX: newsletter - adding unsubscribe link

modules/ps_emailsubscription/controllers/front/unsubscribe.php

@@ -0,0 +1,34 @@
+<?php
+
+class Ps_EmailsubscriptionUnsubscribeModuleFrontController extends ModuleFrontController
+{
+    /** @var string */
+    protected $message = '';
+
+    public function init()
+    {
+        parent::init();
+
+        $token = Tools::getValue('token');
+
+        if (!$token) {
+            $this->message = $this->module->trans(
+                'Invalid unsubscribe link.',
+                [],
+                'Modules.Emailsubscription.Shop'
+            );
+        } else {
+            $this->message = $this->module->unsubscribeByToken($token);
+        }
+    }
+
+    public function initContent()
+    {
+        parent::initContent();
+
+        $this->context->smarty->assign('message', $this->message);
+        $this->setTemplate(
+            'module:ps_emailsubscription/views/templates/front/unsubscribe_execution.tpl'
+        );
+    }
+}