foxy-moxy/server.js

/* eslint no-unused-vars: ["error", { "varsIgnorePattern": "newrelic" }] */

try {
  const newrelic = require('newrelic')
} catch (e) {
  console.error('WARNING unable to load newrelic')
}

const express = require('express')
const uuid = require('uuid/v4')
const sanitize = require('sanitize-filename')
const Canvas = require('canvas')

const Fox = require('./js/fox.js')
const renderFox = require('./js/render-fox.js')

function composeImage (width, height, seed) {
  seed = seed || uuid()
  const fox = Fox(width, height, seed)
  const canvas = new Canvas(width, height)
  renderFox(canvas, fox)
  return canvas
};

const cacheTimeout = 60 * 60 * 24 * 30
const app = express()

app.get('/healthcheck', (req, res) => {
  res.status(200).end()
})

app.get('/:width/:seed', (req, res) => {
  let width = parseInt(req.params.width) || 400
  if (width > 400) width = 400
  const seed = sanitize(req.params.seed) || uuid()
  const canvas = composeImage(width, width, seed)
  const buffer = canvas.toBuffer()
  res.set('Cache-Control', 'max-age=' + cacheTimeout)
  res.set('Content-length', buffer.length)
  res.type('png')
  res.end(buffer, 'binary')
})

module.exports = app