Add a simple script to generate SRI hashes.

build/generate-sri.js

@@ -0,0 +1,53 @@
+#!/usr/bin/env node
+
+/*!
+ * Script to generate SRI hashes for use in our docs.
+ * Copyright 2017 The Bootstrap Authors
+ * Copyright 2017 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+const sriToolbox = require('sri-toolbox')
+const sh = require('shelljs')
+const sed = sh.sed
+
+sh.config.fatal = true
+
+const configFile = path.join(__dirname, '..', '_config.yml')
+
+const files = [
+  {
+    file: 'dist/css/bootstrap.min.css',
+    yamlName: 'css_hash'
+  },
+  {
+    file: 'dist/js/bootstrap.min.js',
+    yamlName: 'js_hash'
+  },
+  {
+    file: 'assets/js/vendor/jquery-slim.min.js',
+    yamlName: 'jquery_hash'
+  },
+  {
+    file: 'assets/js/vendor/popper.min.js',
+    yamlName: 'popper_hash'
+  }
+]
+
+files.forEach((file) => {
+  fs.readFile(file.file, 'utf8', (err, data) => {
+    if (err) {
+      throw err
+    }
+
+    const integrity = sriToolbox.generate({
+      algorithms: ['sha384']
+    }, data)
+
+    sed('-i', new RegExp(`(\\s${file.yamlName}:\\s+"|')(\\S+)("|')`), '$1' + integrity + '$3', configFile)
+  })
+})

build/ship.sh

@@ -40,6 +40,12 @@ printf "\n${magenta}Compile latest CSS and JS...${end}"
 printf "\n${magenta}=======================================================\n${end}"
 npm run dist
 
+# Generate the SRI hashes
+printf "\n${magenta}=======================================================${end}"
+printf "\n${magenta}Generate the SRI hashes...${end}"
+printf "\n${magenta}=======================================================\n${end}"
+npm run release-sri
+
 # Compress the dist files
 printf "\n${magenta}=======================================================${end}"
 printf "\n${magenta}Compressing the dist files...${end}"

package.json

@@ -55,6 +55,7 @@
     "docs-upload-preview": "build/upload-preview.sh",
     "docs-workbox-precache": "node build/workbox.js",
     "maintenance-dependencies": "ncu -a -x jquery && npm update && bundle update && shx echo 'Manually update assets/js/vendor/*, js/tests/vendor/* and .travis.yml'",
+    "release-sri": "node build/generate-sri.js",
     "release-version": "node build/change-version.js",
     "release-zip": "cd dist/ && zip -r9 bootstrap-$npm_package_version-dist.zip * && shx mv bootstrap-$npm_package_version-dist.zip ..",
     "dist": "npm-run-all --parallel css js",
@@ -106,6 +107,7 @@
     "rollup-plugin-node-resolve": "^3.0.0",
     "shelljs": "^0.7.8",
     "shx": "^0.2.2",
+    "sri-toolbox": "^0.2.0",
     "stylelint": "^8.2.0",
     "stylelint-config-recommended-scss": "^2.0.0",
     "stylelint-config-standard": "^17.0.0",