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Implement cache-busting and SRI for CSS

Use Hugo's fingerprinting pipes [0] to give external stylesheets an
identifier to enable cache-busting [1].
Since Hugo's fingerprinting automatically generates the information
needed for SRI [2], include an integrity attribute too.

I discovered this feature through webhint [3], and added the .hintrc
file I used to the repo root.

[0]: https://gohugo.io/hugo-pipes/fingerprint/
[1]: https://css-tricks.com/strategies-for-cache-busting-css/
[2]: https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity
[3]: https://webhint.io/
This commit is contained in:
rohan kumar 2020-12-11 17:21:34 -08:00
parent 7c8b40ac4c
commit 74e939f40b
No known key found for this signature in database
GPG key ID: 1E892DB2A5F84479
3 changed files with 48 additions and 3 deletions

1
.gitignore vendored
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@ -1,2 +1,3 @@
public/
public_*/
hint-report/

43
.hintrc Normal file
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@ -0,0 +1,43 @@
{
"extends": [
"web-recommended"
],
"connector": {
"name": "puppeteer",
"options": {
"browser": "Chromium",
"headless": false
}
},
"browserslist": [
">.01%, last 2 versions, not dead"
],
"hints": {
"axe/other": "error",
"https-only": "error",
"doctype": "error",
"no-broken-links": "error",
"performance-budget": "error",
"compat-api/css": "error",
"compat-api/html": [
"error",
{
"ignore": [
"time",
"picture"
]
}
],
"http-compression": [
"warning",
{
"html": {
"brotli": false
},
"resource": {
"brotli": false
}
}
]
}
}

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@ -17,10 +17,11 @@
{{ if not (eq $dark "off") -}}
{{ $resources = $resources | append (resources.Get "css/dark.css" | resources.ExecuteAsTemplate "dark.css" .) -}}
{{ end -}}
{{ $css := $resources | resources.Concat "css/style.css" | minify }}
{{ printf `<link rel="stylesheet" href="%s">` $css.RelPermalink | safeHTML }}
{{ $css := $resources | resources.Concat "css/style.css" | minify | resources.Fingerprint "sha384" -}}
{{ printf `<link rel="stylesheet" href="%s" integrity="%s">` $css.RelPermalink $css.Data.Integrity | safeHTML }}
{{ if .Params.highlight -}}
{{ printf `<link rel="stylesheet" href="/css/syntax.css">` | safeHTML }}
{{ $css_syntax := resources.Get "/css/syntax.css" | minify | resources.Fingerprint "sha384" }}
{{- printf `<link rel="stylesheet" href="%s" integrity="%s">` $css_syntax.RelPermalink $css_syntax.Data.Integrity | safeHTML }}
{{ end -}}
{{ if eq .RelPermalink "/" -}}