ruby-on-rails - S3 中 ActiveStorage 对象的永久 URL

Question

我有一个模型叫 Campaign和每个 Campaign有一个附件。
我使用 S3 ActiveStorage 存储，我的 Campaign 需要一个永久 URL图片。
我目前生成的网址如下:

campaign.image.service_url

但是这个链接会在 5 分钟后失效。我需要非过期链接。 (配置设置只让我得到一个 1 周后过期的 URL，它并没有再次解决我的问题)
如何获取我的图像的 URL？
编辑
解决方案:
我使用 CloudFront 作为 CDN。这是我找到的解决方案:
https://domainName+/campaign.image.key
这提供了一个指向不会过期的图像文件的链接。

Answer 1

检查文档 https://api.rubyonrails.org/classes/ActiveStorage/Variant.html#method-i-service_url
你不应该暴露 service_url直接地:

Returns the URL of the variant on the service. This URL is intended to be short-lived for security and not used directly with users. Instead, the service_url should only be exposed as a redirect from a stable, possibly authenticated URL. Hiding the service_url behind a redirect also gives you the power to change services without updating all URLs. And it allows permanent URLs that redirect to the service_url to be cached in the view.

Use url_for(variant) (or the implied form, like +link_to variant+ or +redirect_to variant+) to get the stable URL for a variant that points to the ActiveStorage::RepresentationsController, which in turn will use this service_call method for its redirection.

所以使用 url_for(campaign.image) (或 url_for(campaign.image.some_variant) )代替。