implement oembed provider

api/handlers/oembed.js

@@ -0,0 +1,42 @@
+/*
+ * See oEmbed standard here: https://oembed.com/
+ */
+const url = require('url')
+
+const toIFrame = (url, width, height) =>
+  `<iframe
+  src="https://carbon.now.sh/embed${url}"
+  style="transform:scale(0.7); width:${width}px; height:${height}px; border:0; overflow:hidden;"
+  sandbox="allow-scripts allow-same-origin">
+</iframe>
+`
+
+module.exports = (req, res) => {
+  let embedUrl = req.query.url
+
+  try {
+    embedUrl = decodeURIComponent(req.query.url)
+  } catch (e) {
+    /* URL is already decoded */
+  }
+
+  try {
+    const { query } = url.parse(embedUrl)
+
+    const width = Math.min(Number(req.query.maxwidth) || Infinity, 1024)
+    const height = Math.min(Number(req.query.maxheight) || Infinity, 473)
+
+    const obj = {
+      version: '1.0',
+      type: 'rich',
+      provider_name: 'Carbon',
+      width,
+      height,
+      html: toIFrame(`?${query}`, width, height)
+    }
+
+    return res.json(obj)
+  } catch (e) {
+    return res.status(500).send()
+  }
+}

api/server.js

@@ -36,6 +36,7 @@ puppeteer.launch(puppeteerParams).then(browser => {
   const server = express()
   const imageHandler = require('./handlers/image')(browser)
   const unsplashHandler = require('./handlers/unsplash')
+  const oembedHandler = require('./handlers/oembed')
 
   if (dev) {
     server.use(morgan('tiny'))
@@ -54,6 +55,7 @@ puppeteer.launch(puppeteerParams).then(browser => {
   server.post('/image', bodyParser.json({ limit: '5mb' }), wrap(imageHandler))
   server.get('/unsplash/random', wrap(unsplashHandler.randomImages))
   server.get('/unsplash/download/:imageId', wrap(unsplashHandler.downloadImage))
+  server.get('/oembed', oembedHandler)
 
   server.listen(port, '0.0.0.0', err => {
     if (err) throw err