mirror of
https://git.sr.ht/~seirdy/seirdy.one
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61 lines
2 KiB
Markdown
61 lines
2 KiB
Markdown
---
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title: "Short cache busting fingerprints in Hugo"
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date: 2024-03-28T00:16:48-04:00
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replyURI: "https://github.com/gohugoio/hugo/issues/6241"
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replyTitle: "Shorter fingerprinting (Hugo issue 6241)"
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replyType: "DiscussionForumPosting"
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replyAuthor: "XhmikosR"
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replyAuthorURI: "https://github.com/XhmikosR"
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syndicatedCopies:
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- title: 'GitHub'
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url: 'https://github.com/gohugoio/hugo/issues/6241#issuecomment-2024366155'
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- title: 'The Fediverse'
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url: 'https://pleroma.envs.net/notice/AgIhXz3q628odren2G'
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- title: 'IndieNews'
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url: 'https://news.indieweb.org/en'
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---
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I use a quick `crypto.FNV32a`-based fix for short cache-busting fingerprints that doesn't directly rely on the unstable `.Key` method.
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{{<codefigure>}}{{<codecaption lang="Go template">}}
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I use Hugo's `crypto.FNV32a` to generate a short hash, then copy the resource to a new path with that fingerprint.
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{{</codecaption>}}
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```figure
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{{ $resource := resources.Get . -}}
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{{- $target_path_formatStr := (replaceRE `(\.[^\.]*)$` ".%d$1" .) -}}
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{{- $cacheBuster := $resource.Content | crypto.FNV32a -}}
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{{- $target_path := printf $target_path_formatStr $cacheBuster -}}
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{{- return resources.Copy $target_path $resource -}}
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```
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{{</codefigure>}}
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{{<codefigure>}}{{<codecaption lang="Go template">}}
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You can [see it used in my site's <code>head</code> element](https://git.sr.ht/~seirdy/seirdy.one/blob/master/layouts/partials/head.html). I invoke it using `partialCached` so the fingerprinting only happens once per resource:
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{{</codecaption>}}
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```figure
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{{ $icon_svg := partialCached "cache-bust.html" "/favicon.svg" "/favicon.svg" }}
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{{- printf `<link rel="icon" sizes="any" href="%s" type="image/svg+xml" />` $icon_svg.RelPermalink | safeHTML }}
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```
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{{</codefigure>}}
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{{<codefigure>}}{{<codecaption lang="HTML">}}
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Here's a snippet of the final rendered result:
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{{</codecaption>}}
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```figure
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<link rel="icon" sizes="any" href="/favicon.2229316949.svg" type="image/svg+xml"/>
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```
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{{</codefigure>}}
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Encoding it to a higher base and using alphanumerics could shave off 1-2 ch.
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