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Add tooling to generate SRI hashes for assets

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Subresource integrity allows user agents to verify that a fetched
resource has been delivered without unexpected manipulation[0]. I
put theme assets in a json configuration file and save the hashes
to a TOML file that Hugo loads via its theme data mechanism[1].

[0] https://www.w3.org/TR/SRI/
[1] https://gohugo.io/extras/datafiles/
This commit is contained in:
Alan Orth 2017-01-11 10:32:43 +02:00
parent c2d9b1ad74
commit 683755f95d
Signed by: alanorth
GPG Key ID: 0FB860CC9C45B1B9
3 changed files with 30 additions and 1 deletions
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5
build/assets.json Normal file
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{
"style": "static/css/style.css",
"cookieconsentcss": "static/css/cookieconsent.min.css",
"cookieconsentjs": "static/js/cookieconsent.min.js"
}

23
build/sri.js Normal file
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// Adapted from: https://gist.github.com/jmervine/ae1bace0fe37dce75b90ec3e9592771c
var crypto = require('crypto');
var fs = require('fs');
var assets = require('./assets.json');
var generate384 = function (file) {
var enc = 'utf8';
var body = fs.readFileSync(file, { encoding: enc });
var hash = crypto.createHash('sha384').update(body, enc);
var sha = hash.digest('base64');
return 'sha384-' + sha;
}
for (var asset in assets) {
var path = assets[asset];
var hash = generate384(path);
console.log(asset + ' = "' + hash + '"');
}
// vim: set ts=2 sw=2 et:

3
package.json
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@ -10,7 +10,8 @@
"build:css": "node-sass --output-style expanded --precision 6 source/scss/style.scss static/css/style.css.tmp && cleancss --skip-advanced static/css/style.css.tmp -o static/css/style.css",
"build:fonts": "cp node_modules/font-awesome/fonts/* static/fonts",
"build:cookieconsent": "cp node_modules/cookieconsent/build/cookieconsent.min.css static/css && cp node_modules/cookieconsent/build/cookieconsent.min.js static/js",
"build": "npm run build:css && npm run build:fonts && npm run build:cookieconsent && npm run clean",
"build:generatesri": "node build/sri.js > data/sri.toml",
"build": "npm run build:css && npm run build:fonts && npm run build:cookieconsent && npm run build:generatesri && npm run clean",
"clean": "rm static/css/style.css.tmp"
},
"keywords": "hugo",