ruby-on-rails - Rails 5.2：授权访问 ActiveStorage::BlobsController#show

Question

我想授权访问ActiveStorage附件并查看BlobsController（https://github.com/rails/rails/blob/master/activestorage/app/controllers/active_storage/blobs_controller.rb）的源代码如下：

# Take a signed permanent reference for a blob and turn it into an expiring service URL for download.
# Note: These URLs are publicly accessible. If you need to enforce access protection beyond the
# security-through-obscurity factor of the signed blob references, you'll need to implement your own
# authenticated redirection controller.
class ActiveStorage::BlobsController < ActiveStorage::BaseController
  include ActiveStorage::SetBlob

  def show
    expires_in ActiveStorage.service_urls_expire_in
    redirect_to @blob.service_url(disposition: params[:disposition])
  end
end

但即使上面的注释建议创建一个自定义控制器，我也需要覆盖 ActiveStorage 生成的路由，因为它们指向原始控制器，并且在我的设备上重新定义它们routes.rb似乎会引发异常。此外，我不想再公开这些路由，因为它们没有被授权，并且有人可以获取signed_idblob 并使用原始端点获取附件。循环应用程序初始化时的路由并删除旧的 ActiveStorage 路由并插入新的路由似乎是目前最好的解决方案，但我想避免这种情况。

有什么建议么？

标签： ruby-on-railsrails-activestorage

Answer 1

创建一个新控制器以覆盖原始控制器：app/controllers/active_storage/blobs_controller.rb然后根据您的需要添加相应的授权方法：

#app/controllers/active_storage/blobs_controller.rb
class ActiveStorage::BlobsController < ActiveStorage::BaseController
  include ActiveStorage::SetBlob

  def show
    redirect_to @blob.service_url(disposition: params[:disposition])
    authorize! :show, @blob # NOT TESTED!
  end

end

show当您单击附件的链接时，将触发该操作。

@blob.class #=> ActiveStorage::Blob