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import crypto from 'crypto'
import Document, { Html, Head, Main, NextScript } from 'next/document'
const cspHashOf = (text) => {
const hash = crypto.createHash('sha256')
hash.update(text)
return `'sha256-${hash.digest('base64')}'`
}
export default class MyDocument extends Document {
static async getInitialProps(ctx) {
let options
const enhanceComponent = (Component) => (props) => (
<div>
<span id="render-page-enhance-component">RENDERED</span>
<Component {...props} />
</div>
)
const enhanceApp = (Component) => (props) => (
<div>
<span id="render-page-enhance-app">RENDERED</span>
<Component {...props} />
</div>
)
if (ctx.query.withEnhancer) {
options = enhanceComponent
} else if (ctx.query.withEnhanceComponent || ctx.query.withEnhanceApp) {
options = {}
if (ctx.query.withEnhanceComponent) {
options.enhanceComponent = enhanceComponent
}
if (ctx.query.withEnhanceApp) {
options.enhanceApp = enhanceApp
}
}
const result = await ctx.renderPage(options)
return {
...result,
cssInJsCount: (result.html.match(/css-in-js-class/g) || []).length,
customProperty: 'Hello Document',
withCSP: ctx.query.withCSP,
}
}
render() {
let csp
// eslint-disable-next-line default-case
switch (this.props.withCSP) {
case 'hash':
csp = `default-src 'self'; script-src 'self' ${cspHashOf(
NextScript.getInlineScriptSource(this.props)
)}; style-src 'self' 'unsafe-inline'`
break
case 'nonce':
csp = `default-src 'self'; script-src 'self' 'nonce-test-nonce'; style-src 'self' 'unsafe-inline'`
break
}
return (
<Html className="test-html-props">
<Head nonce="test-nonce">
{csp ? (
<meta httpEquiv="Content-Security-Policy" content={csp} />
) : null}
<style>{`body { margin: 0 } /* custom! */`}</style>
</Head>
<body className="custom_class">
<p id="custom-property">{this.props.customProperty}</p>
<p id="document-hmr">Hello Document HMR</p>
<Main />
<NextScript nonce="test-nonce" />
<div id="css-in-cjs-count">{this.props.cssInJsCount}</div>
</body>
</Html>
)
}
}
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