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seo-image.js
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const fs = require('fs')
const nodeHtmlToImage = require('node-html-to-image')
const { join } = require('path')
fs.mkdirSync(join('.', 'dist', 'seo-images'), { recursive: true })
// https://gist.github.com/kethinov/6658166
var walkSync = function(dir, filelist) {
if (!dir.endsWith('/')) dir += '/'
var fs = fs || require('fs'),
files = fs.readdirSync(dir)
filelist = filelist || []
files.forEach(function(file) {
if (fs.statSync(dir + '/' + file).isDirectory()) {
filelist = walkSync(dir + file + '/', filelist)
} else {
filelist.push(dir + file)
}
})
return filelist
}
const generate = async () => {
const files = walkSync(join('.', 'dist')).filter(i => i.endsWith('.html'))
for await (const file of files) {
const fileName =
file.replace('/index.html', '').replace(/\//g, '_') + '.png'
const html = fs.readFileSync(file).toString()
let title = ''
try {
title = html
.split('<title>')[1]
.split('</title>')[0]
.split(' | ')[0]
if (title === 'Karuna 2020') title = ''
} catch (error) {}
let image = ''
try {
const images = html
.split('\n')
.filter(line => line.startsWith('<img src="'))
const lastImage = images.pop()
image = lastImage.split('src="')[1].split('"')[0]
} catch (error) {}
await nodeHtmlToImage({
output: join('dist', 'seo-images', fileName),
html: `<html>
<head>
<style>
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
width: 1200px;
padding: 100px;
margin: 0;
box-sizing: border-box;
height: 630px;
font-size: 24px;
font-family: sans-serif;
text-align: center;
display: flex;
justify-content: center;
align-items: center;
background-color: #c00058;
color: #fff;
}
img {
height: 100px;
margin-right: 40px;
}
body > div > div {
display: flex;
justify-content: center;
align-items: center;
}
div {
font-size: 70px;
}
h1 {
font-size: 100px;
}
.backgroundimage {
position: absolute;
left: 0; right: 0;
top: 0; bottom: 0;
background-size: cover;
background-repeat: no-repeat;
background-position: top center;
opacity: 0.75;
z-index: -1;
}
</style>
</head>
<body>
<div>
<h1>${title}</h1>
<div>
<img alt="" src="https://cdn.karuna2020.org/icon-white.svg">
<div>Karuna 2020</div>
</div>
</div>
${
image
? `<div class="backgroundimage" style="background-image: url('${image}')">`
: ''
}
</body>
</html>`
})
console.log('Generated SEO image', fileName)
fs.writeFileSync(
file,
fs
.readFileSync(file)
.toString()
.replace(
'</title>',
'</title><meta name="twitter:image" content="https://karuna2020.org/seo-images/' +
fileName +
'"><meta property="og:image:type" content="image/png"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="630"><meta property="og:image" content="https://karuna2020.org/seo-images/' +
fileName +
'">'
)
)
}
}
generate()