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