pages/api/social-image.tsx

import React from 'react'
import { withOGImage } from 'next-api-og-image'
import { interRegular } from '../../lib/fonts'

/**
 * Social image generation via headless chrome.
 *
 * Note: To debug social images, set `debugInspectHtml` to true and load a social
 * image URL. Instead of returning the rendered image, it will return the raw HTML
 * that would've been passed to puppeteer. This makes it much easier to develop
 * and debug issues locally.
 */
const debugInspectHtml = false

export default withOGImage<
  'query',
  | 'title'
  | 'image'
  | 'author'
  | 'authorImage'
  | 'detail'
  | 'imageObjectPosition'
>({
  template: {
    react: ({
      title,
      image,
      author,
      authorImage,
      detail,
      imageObjectPosition
    }) => {
      return (
        <html>
          <head>
            <style dangerouslySetInnerHTML={{ __html: style }} />
          </head>

          <body>
            <div className='container'>
              <div className='horiz'>
                <div className='lhs'>
                  <div className='main'>
                    <h1 className='title'>{title}</h1>
                  </div>

                  <div className='metadata'>
                    {authorImage && (
                      <div
                        className='author-image'
                        style={{ backgroundImage: `url(${authorImage})` }}
                      />
                    )}

                    {(author || detail) && (
                      <div className='metadata-rhs'>
                        {author && <div className='author'>{author}</div>}
                        {detail && <div className='detail'>{detail}</div>}
                      </div>
                    )}
                  </div>
                </div>

                {image && (
                  <img
                    src={image}
                    className='rhs'
                    style={{
                      objectPosition: imageObjectPosition || undefined
                    }}
                  />
                )}
              </div>
            </div>
          </body>
        </html>
      )
    }
  },
  cacheControl: 'max-age=0, s-maxage=86400, stale-while-revalidate=3600',
  type: 'jpeg',
  quality: 75,
  dev: {
    inspectHtml: debugInspectHtml
  }
})

const style = `
@font-face {
  font-family: 'Inter';
  font-style:  normal;
  font-weight: normal;
  src: url(data:font/woff2;charset=utf-8;base64,${interRegular}) format('woff2');
}

:root {
  --padding: 8vmin;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  padding: 0;
  margin: 0;
}

.container {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--padding);
  background: #1F2027;
  color: #fff;
}

.horiz {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  gap: var(--padding);
  width: 100%;
  height: 100%;
}

.lhs {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.rhs {
  width: 35%;
  height: 100%;
  border-radius: 4px;
  object-fit: cover;
}

.title {
  font-size: 3em;
}

.metadata {
  color: #A9ACC0;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: calc(var(--padding) * 0.7);
  font-size: 1.5em;
}

.author {
  font-size: 1.75em;
}

.author-image {
  background-size: cover;
  width: 20vmin;
  min-width: 20vmin;
  max-width: 20vmin;
  height: 20vmin;
  min-height: 20vmin;
  max-height: 20vmin;
  border-radius: 50%;
  border: 1.5vmin solid #fff;
}

.metadata-rhs {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.5em;
}

.detail {
  overflow-wrap: break-word;
}
`