Feature Request: rel="noopener/noreferrer/nofollow" option on external links

[lukehsiao]

Feature Request

This feature request is similar to #681. In Hugo, we can configure the markdown parser (blackfriday) to include rel attributes like nofollow and noreferrer in order to inform crawlers or prevent leaking referrer information. It has also been shown that rel="noopener" can be useful in preventing websites from manipulating the window object of a document.

It would be great to be able to include flags to enable or disable the inclusion of these rel attributes for markdown links, similar to how #681 seeks to enable or disable including target="_blank" with these markdown links.

I'd also point out that Hugo currently does not support rel="noopener" (it is supported by blackfriday v2, but hugo is still using blackfriday v1), so adding this support would be a nice advantage for zola.

[Keats]

Good idea! I've linked to it from #681, I'll leave this open for now but ideally it will be built in the same PR as 681

[flatlandy]

Does the "external_links_no_follow" variable apply to external URL's specified within the frontmatter redirect_to variable?

I am using the redirect_to functionality to create "pretty" outbound links similar to website.com/out/amazon which would redirect to amazon.com/[affiliate code]. As you can imagine, it would be best to have these set to nofollow.

[Keats]

No it doesn't because we are using HTML redirects for that