pinafore/bin/build-vercel-json.js

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// create the vercel.json file
// Unfortunately this has to be re-run periodically, as AFAICT there is no way to
// give Zeit a script and tell them to run that, instead of using a static vercel.json file.
import path from 'path'
import fs from 'fs'
import { promisify } from 'util'
import { routes } from '../__sapper__/service-worker'
import cloneDeep from 'lodash-es/cloneDeep'
import inlineScriptChecksum from '../src/inline-script/checksum'
import { sapperInlineScriptChecksums } from '../src/server/sapperInlineScriptChecksums'
const writeFile = promisify(fs.writeFile)
const JSON_TEMPLATE = {
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version: 2,
env: {
NODE_ENV: 'production'
},
github: {
silent: true
},
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builds: [
{
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src: 'package.json',
use: '@now/static-build',
config: {
distDir: '__sapper__/export'
}
}
],
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routes: [
{
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src: '^/service-worker\\.js$',
headers: {
'cache-control': 'public,max-age=0'
}
},
{
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src: '^/(report\\.html|stats\\.json)$',
headers: {
'cache-control': 'public,max-age=3600'
},
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dest: 'client/$1'
},
{
src: '^/client/.*\\.(js|css|map|LICENSE|txt)$',
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headers: {
'cache-control': 'public,max-age=31536000,immutable'
}
},
{
src: '^/.*\\.(png|css|json|svg|jpe?g|map|txt|gz|webapp)$',
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headers: {
'cache-control': 'public,max-age=3600'
}
}
]
}
const SCRIPT_CHECKSUMS = [inlineScriptChecksum]
.concat(sapperInlineScriptChecksums)
.map(_ => `'sha256-${_}'`)
.join(' ')
const PERMISSIONS_POLICY = 'sync-xhr=(),document-domain=()'
const HTML_HEADERS = {
'cache-control': 'public,max-age=3600',
'content-security-policy': [
"default-src 'self'",
`script-src 'self' ${SCRIPT_CHECKSUMS}`,
"worker-src 'self'",
"style-src 'self' 'unsafe-inline'",
"img-src 'self' * data: blob:",
"media-src 'self' *",
"connect-src 'self' * data: blob:",
"frame-src 'none'",
"frame-ancestors 'none'",
"object-src 'none'",
"manifest-src 'self'",
"form-action 'self'", // we need form-action for the Web Share Target API
"base-uri 'self'"
].join(';'),
'referrer-policy': 'no-referrer',
'strict-transport-security': 'max-age=15552000; includeSubDomains',
'permissions-policy': PERMISSIONS_POLICY,
'x-content-type-options': 'nosniff',
'x-download-options': 'noopen',
'x-frame-options': 'DENY',
'x-xss-protection': '1; mode=block',
'cross-origin-opener-policy': 'same-origin'
}
async function main () {
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const json = cloneDeep(JSON_TEMPLATE)
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const exportDir = path.resolve(__dirname, '../__sapper__/export')
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for (const { pattern } of routes) {
const route = {
src: pattern.source,
headers: cloneDeep(HTML_HEADERS)
}
// remove all the regexy stuff in the regex
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const filename = pattern.source.replace(/^\^\\\//, '').replace(/(\\\/)?\?\$$/, '').replace(/\\\//g, '/')
// try two different possible paths
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const filePath = [
`${filename}.html`,
path.join(filename, 'index.html')
].map(_ => path.resolve(exportDir, _)).find(_ => fs.existsSync(_))
if (!filePath) { // dynamic route, e.g. /accounts/<accountId/
// serve calls to dynamic routes via the generic "service worker" index.html,
// since we can't generate the dynamic content using Zeit's static server
route.dest = 'service-worker-index.html'
}
json.routes.push(route)
}
// push a generic route to handle everything else
json.routes.push({
src: '^/(.*)',
headers: cloneDeep(HTML_HEADERS)
})
await writeFile(path.resolve(__dirname, '../vercel.json'), JSON.stringify(json, null, ' '), 'utf8')
}
main().catch(err => {
console.error(err)
process.exit(1)
})