set up local development for openscad lamdas

and make a start on combining with Three.js IdeViewer
Resolves #227

related #231

api/src/docker/aws-emulator.js

@@ -0,0 +1,34 @@
+const express = require('express')
+var cors = require('cors')
+const axios = require('axios')
+const stream = require('stream')
+const app = express()
+const port = 8080
+app.use(express.json())
+app.use(cors())
+
+const invocationURL = (port) =>
+  `http://localhost:${port}/2015-03-31/functions/function/invocations`
+
+app.post('/render', async (req, res) => {
+  const { data } = await axios.post(invocationURL(5052), {
+    body: Buffer.from(JSON.stringify(req.body)).toString('base64'),
+  })
+  if (data.statusCode !== 200) {
+    res.status(data.statusCode)
+    res.send(res.body)
+  } else {
+    const fileContents = Buffer.from(data.body, 'base64')
+
+    const readStream = new stream.PassThrough()
+    readStream.end(fileContents)
+
+    res.set('Content-disposition', 'attachment; filename=' + 'output')
+    res.set('Content-Type', 'image/png')
+    readStream.pipe(res)
+  }
+})
+
+app.listen(port, () => {
+  console.log(`Example app listening at http://localhost:${port}`)
+})