Fix incorrect setting of the SameSite cookie param

Author: ihor-sviziev

app/code/Magento/Cookie/view/base/web/js/jquery.storageapi.extended.js

@@ -16,9 +16,11 @@ define([
      * @private
      */
     function _extend(storage) {
+        var cookiesConfig = window.cookiesConfig || {};
+
         $.extend(storage, {
-            _secure: window.cookiesConfig ? window.cookiesConfig.secure : false,
-            _samesite: window.cookiesConfig ? window.cookiesConfig.samesite : 'lax',
+            _secure: !!cookiesConfig.secure,
+            _samesite: cookiesConfig.samesite ? cookiesConfig.samesite : 'lax',
 
             /**
              * Set value under name

lib/web/jquery/jquery.cookie.js

@@ -47,7 +47,7 @@
                 options.path    ? '; path=' + options.path : '',
                 options.domain  ? '; domain=' + options.domain : '',
                 options.secure  ? '; secure' : '',
-                options.samesite  ? '; samesite=' + options.samesite : 'lax',
+                '; samesite=' + (options.samesite ? options.samesite : 'lax'),
             ].join(''));
         }
 

lib/web/mage/cookies.js

@@ -76,7 +76,7 @@ define([
                 (path ? '; path=' + path : '') +
                 (domain ? '; domain=' + domain : '') +
                 (secure ? '; secure' : '') +
-                (samesite ? '; samesite=' + samesite : 'lax');
+                '; samesite=' + (samesite ? samesite : 'lax');
         };
 
         /**