/**
* Copyright (c) 2017-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
const React = require('react');
// html head for each page
class Head extends React.Component {
render() {
const links = this.props.config.headerLinks;
const hasBlog = links.some(link => link.blog);
const highlight = {
version: '9.12.0',
theme: 'default',
...this.props.config.highlight,
};
// Use user-provided themeUrl if it exists, else construct one from version and theme.
const highlightThemeURL = highlight.themeUrl
? highlight.themeUrl
: `//cdnjs.cloudflare.com/ajax/libs/highlight.js/${
highlight.version
}/styles/${highlight.theme}.min.css`;
// ensure the siteUrl variable ends with a single slash
const siteUrl = `${(
this.props.config.url + this.props.config.baseUrl
).replace(/\/+$/, '')}/`;
return (
<head>
<meta charSet="utf-8" />
<meta httpEquiv="X-UA-Compatible" content="IE=edge" />
<title>{this.props.title}</title>
<meta name="viewport" content="width=device-width" />
<meta name="generator" content="Docusaurus" />
<meta name="description" content={this.props.description} />
{this.props.version && (
<meta name="docsearch:version" content={this.props.version} />
)}
{this.props.language && (
<meta name="docsearch:language" content={this.props.language} />
)}
<meta property="og:title" content={this.props.title} />
<meta property="og:type" content="website" />
<meta property="og:url" content={this.props.url} />
<meta property="og:description" content={this.props.description} />
{this.props.config.ogImage && (
<meta
property="og:image"
content={siteUrl + this.props.config.ogImage}
/>
)}
<meta name="twitter:card" content="summary" />
{this.props.config.twitterImage && (
<meta
name="twitter:image"
content={siteUrl + this.props.config.twitterImage}
/>
)}
{this.props.config.noIndex && <meta name="robots" content="noindex" />}
{this.props.redirect && (
<meta httpEquiv="refresh" content={`0; URL=${this.props.redirect}`} />
)}
{this.props.config.manifest && (
<link rel="manifest" content={siteUrl + this.props.config.manifest} />
)}
<link
rel="shortcut icon"
href={this.props.config.baseUrl + this.props.config.favicon}
/>
{this.props.config.algolia && (
<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"
/>
)}
<link rel="stylesheet" href={highlightThemeURL} />
{hasBlog && (
<link
rel="alternate"
type="application/atom+xml"
href={`${siteUrl}blog/atom.xml`}
title={`${this.props.config.title} Blog ATOM Feed`}
/>
)}
{hasBlog && (
<link
rel="alternate"
type="application/rss+xml"
href={`${siteUrl}blog/feed.xml`}
title={`${this.props.config.title} Blog RSS Feed`}
/>
)}
{this.props.config.gaTrackingId &&
this.props.config.gaGtag && (
<script
async
src={`https://www.googletagmanager.com/gtag/js?id=${
this.props.config.gaTrackingId
}`}
/>
)}
{this.props.config.gaTrackingId &&
this.props.config.gaGtag && (
<script
dangerouslySetInnerHTML={{
__html: `
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments); }
gtag('js', new Date());
gtag('config', '${this.props.config.gaTrackingId}');
`,
}}
/>
)}
{this.props.config.gaTrackingId &&
!this.props.config.gaGtag && (
<script
dangerouslySetInnerHTML={{
__html: `
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
ga('create', '${this.props.config.gaTrackingId}', 'auto');
ga('send', 'pageview');
`,
}}
/>
)}
{/* External resources */}
{this.props.config.stylesheets &&
this.props.config.stylesheets.map(
source =>
source.href ? (
<link rel="stylesheet" key={source.href} {...source} />
) : (
<link rel="stylesheet" key={source} href={source} />
)
)}
{this.props.config.scripts &&
this.props.config.scripts.map(
source =>
source.src ? (
<script type="text/javascript" key={source.src} {...source} />
) : (
<script type="text/javascript" src={source} key={source} />
)
)}
{this.props.config.scrollToTop && (
<script src="https://unpkg.com/vanilla-back-to-top@7.1.14/dist/vanilla-back-to-top.min.js" />
)}
{this.props.config.scrollToTop && (
<script
dangerouslySetInnerHTML={{
__html: `
document.addEventListener('DOMContentLoaded', function() {
addBackToTop(
${JSON.stringify(
Object.assign(
{},
{zIndex: 100},
this.props.config.scrollToTopOptions
)
)}
)
});
`,
}}
/>
)}
{this.props.config.usePrism && (
<link
rel="stylesheet"
href={`${this.props.config.baseUrl}css/prism.css`}
/>
)}
{/* Site defined code. Keep these at the end to avoid overriding. */}
<link
rel="stylesheet"
href={`${this.props.config.baseUrl}css/main.css`}
/>
</head>
);
}
}
module.exports = Head;