html.js

import React from 'react';
import DocumentTitle from 'react-document-title';
import { prefixLink } from 'gatsby-helpers';


const BUILD_TIME = new Date().getTime();


module.exports = React.createClass({
  displayName: 'HTML',
  propTypes: {
    body: React.PropTypes.string,
  },
  render () {
    const title = DocumentTitle.rewind();

    let css;
    if (process.env.NODE_ENV === 'production') {
      css = <style dangerouslySetInnerHTML={{ __html: require('!raw!./public/styles.css') }} />
    }

    return (
      <html lang="en">
        <head>
          <meta charSet="utf-8" />
          <meta httpEquiv="X-UA-Compatible" content="IE=edge,chrome=1" />
          <meta
            name="viewport"
            content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"
          />
          <link rel="shortcut icon" href="/img/logo.ico" />
          <link rel="shortcut icon" href="/img/logo.png" />
          <meta name="msapplication-TileColor" content="#fff" />
          <meta name="msapplication-TileImage" content="/img/logo.png" />
          <title>{title}</title>
          {css}
        </head>
        <body>
          <div id="react-mount" dangerouslySetInnerHTML={{ __html: this.props.body }} />
          
          <script src={prefixLink(`/bundle.js?t=${BUILD_TIME}`)} />

          <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', 'UA-11640584-17', 'auto');
            ga('send', 'pageview');
          `}}></script>

        </body>
      </html>
    );
  },
})