当我试图验证来自WooCommerce webhooks的签名时，我遇到了一个奇怪的问题。以下是我用来创建签名的部分：

verified = crypto.createHmac('SHA256', secret).update(new Buffer(JSON.stringify(body), 'utf8')).digest('base64');

它适用于每个带有删除主题的网络钩子，请求正文等于这样的内容：

{"id":360}

不幸的是，对于每个具有更新或创建主题的网络钩子，我的签名都不一样。请求正文也更复杂。

 {"product":{"title":"Test","id":392,"created_at":"2017-02-11T21:40:37Z","updated_at":"2017-02-11T21:40:37Z","type":"simple","status":"publish","downloadable":false,"virtual":false,"permalink":"http://cedrus.ma/chezalfred/livraison/non classu00e9/test/","sku":"","price":"","regular_price":"","sale_price":null,"price_html":"","taxable":true,"tax_status":"taxable","tax_class":"","managing_stock":false,"stock_quantity":null,"in_stock":true,"backorders_allowed":false,"backordered":false,"sold_individually":false,"purchaseable":false,"featured":false,"visible":true,"catalog_visibility":"visible","on_sale":false,"product_url":"","button_text":"","weight":null,"dimensions":{"length":"","width":"","height":"","unit":"cm"},"shipping_required":true,"shipping_taxable":true,"shipping_class":"","shipping_class_id":null,"description":"","short_description":"","reviews_allowed":true,"average_rating":"0.00","rating_count":0,"related_ids":[],"upsell_ids":[],"cross_sell_ids":[],"parent_id":0,"categories":[],"tags":[],"images":[{"id":0,"created_at":"2017-02-11T21:40:40Z","updated_at":"2017-02-11T21:40:40Z","src":"http://cedrus.ma/chezalfred/wp-content/plugins/woocommerce/assets/images/placeholder.png","title":"Etiquette","alt":"Etiquette","position":0}],"featured_src":"","attributes":[],"downloads":[],"download_limit":0,"download_expiry":0,"download_type":"","purchase_note":"","total_sales":0,"variations":[],"parent":[],"grouped_products":[],"menu_order":0}}

我认为JSON出现了一些问题。当请求正文更复杂时，使用stringify（）。

验证来自WooCommerce webhooks的签名的正确方法是什么？