Cached SQIP implementation on Netlify

package.json

{
  "name": "sqip-cache-tryout",
  "version": "1.0.0",
  "description": "",
  "main": "",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "stefan judis <stefanjudis@gmail.com>",
  "license": "MIT",
  "dependencies": {
    "contentful": "^6.1.0",
    "download": "^7.0.0",
    "fs-extra": "^6.0.0",
    "sqip": "^0.3.3"
  }
}

sqip-it-with-caching.js

#!/usr/bin/env node

const contentful = require('contentful')
const client = contentful.createClient({
  accessToken: '8c6d9bb62a89a05e4f88af2784a0a3f8bcacc7b401084d50f577dfc5f6df0c61',
  host: 'cdn.contentful.com',
  space: 'fbr4i5aajb0w'
})

const download = require('download')
const path = require('path')
const {emptyDir, writeFile, readFile} = require('fs-extra')
const isProduction = process.env.NODE_ENV === 'production'
const SQIP_CACHE = isProduction
  ? path.join('/', 'opt', 'build', 'cache', 'sqip')
  : path.resolve(__dirname, '.sqip')
const JS_DESTINATION = path.resolve(__dirname, 'image-map.js')
const sqip = require('sqip')

async function sqipItems () {
  console.log('// --------------------------------------------')

  if (process.env.WEBHOOK_TITLE === 'CLEAR_CUSTOM_CACHE') {
    console.log(`Clearing ${SQIP_CACHE}`)
    await emptyDir(SQIP_CACHE)
  }

  console.log('// --------------------------------------------')

  console.log('Getting asset information')
  const {items} = await client.getAssets({limit: 1000})
  let images = items
    .filter(
      ({fields}) => fields.file && ['image/png', 'image/jpeg'].indexOf(fields.file.contentType) !== -1
    )
    .map(({sys, fields}) => ({
      id: sys.id,
      revision: sys.revision,
      url: fields.file.url,
      filename: `${sys.id}-${sys.revision}.${fields.file.contentType.split('/')[1]}`,
      svg: null
    }))
  console.log('Asset information queried')

  console.log('// --------------------------------------------')

  console.log(`Reading cached SVGs from at ${SQIP_CACHE}`)
  images = await Promise.all(images.map(async (image) => {
    try {
      const svg = await readFile(`${SQIP_CACHE}/${image.id}-${image.revision}.svg`, 'utf8')
      if (svg.startsWith('<svg')) {
        image.svg = svg
      }
    } catch (e) {}

    return image
  }))
  console.log('Cached SVGs read')

  console.log('// --------------------------------------------')

  console.log('Downloading images for missing SVGs...')
  await Promise.all(
    images.map(({url, filename, svg}) => {
      if (!svg) {
        console.log(`${filename} is missing -> downloading`)
        return download(
          url.replace(/\/\//, 'https://'),
          SQIP_CACHE,
          { filename }
        )
      }

      return Promise.resolve()
    })
  )
  console.log('Images downloaded')

  console.log('// --------------------------------------------')

  console.log('Creating missing SVGs...')
  await Promise.all(images.map(({id, revision, filename, svg}) => {
    if (!svg) {
      const {final_svg} = sqip({
        filename: path.join(SQIP_CACHE, filename),
        numberOfPrimitives: 10,
        mode: 0,
        blur: 0
      })

      return writeFile(
        path.join(SQIP_CACHE, `${id}-${revision}.svg`),
        final_svg
      )
    }
    
    return Promise.resolve()
  }))
  console.log('SVGs created')

  console.log('// --------------------------------------------')

  console.log('Reading missing SVGs...')
  images = await Promise.all(images.map(async (image) => {
    if (!image.svg) {
      const svg = await readFile(path.join(SQIP_CACHE, `${image.id}-${image.revision}.svg`), 'utf8')
      image.svg = svg.replace('<svg', `<svg id="${image.id}"`)
    }

    return image
  }))
  console.log('SVGs read')

  console.log('// --------------------------------------------')

  console.log('Writing JS mapping file')
  await writeFile(
    JS_DESTINATION,
    `export default {\n  ${images.map(({id, svg}) => `'${id}': '${svg}'`).join(', ')}\n}\n`
  )
  console.log('JS file written')

  console.log('// --------------------------------------------')
}

sqipItems()

sqip-it-without-caching.js

#!/usr/bin/env node

const contentful = require('contentful')
const client = contentful.createClient({
  accessToken: '8c6d9bb62a89a05e4f88af2784a0a3f8bcacc7b401084d50f577dfc5f6df0c61',
  host: 'cdn.contentful.com',
  space: 'fbr4i5aajb0w'
})

const download = require('download')
const path = require('path')
const {writeFile, readFile} = require('fs-extra')
const sqip = require('sqip')

const IMAGE_FOLDER = path.resolve(__dirname, '.sqip-without-cache')
const JS_DESTINATION = path.resolve(__dirname, 'image-map.js')

async function sqipItems () {
  console.log('Getting asset information')
  const {items} = await client.getAssets({limit: 1000})
  let images = items
    .filter(
      ({fields}) => fields.file && ['image/png', 'image/jpeg'].indexOf(fields.file.contentType) !== -1
    )
    .map(({sys, fields}) => ({
      id: sys.id,
      revision: sys.revision,
      url: fields.file.url,
      filename: `${sys.id}-${sys.revision}.${fields.file.contentType.split('/')[1]}`,
      svg: null
    }))
  console.log(`Asset information queried - ${images.length} assets`)

  console.log('// --------------------------------------------')

  console.log('Downloading images for SVGs...')
  await Promise.all(
    images.map(({url, filename, svg}) => {
      return download(
        url.replace(/\/\//, 'https://'),
        IMAGE_FOLDER,
        { filename }
      )
    })
  )
  console.log('Images downloaded')

  console.log('// --------------------------------------------')

  console.log('Creating SVGs...')
  await Promise.all(images.map(({id, revision, filename}) => {
    const {final_svg} = sqip({
      filename: path.join(IMAGE_FOLDER, filename),
      numberOfPrimitives: 10,
      mode: 0,
      blur: 0
    })

    return writeFile(
      path.join(IMAGE_FOLDER, `${id}-${revision}.svg`),
      final_svg
    )
  }))
  console.log('SVGs created')

  console.log('// --------------------------------------------')

  console.log('Reading SVGs...')
  images = await Promise.all(images.map(async (image) => {
    const svg = await readFile(path.join(IMAGE_FOLDER, `${image.id}-${image.revision}.svg`), 'utf8')
    image.svg = svg.replace('<svg', `<svg id="${image.id}"`)

    return image
  }))
  console.log('SVGs read')

  console.log('// --------------------------------------------')

  console.log('Writing JS mapping file')
  writeFile(
    JS_DESTINATION,
    `export default {\n  ${images.map(({id, svg}) => `'${id}': '${svg}'`).join(', ')}\n}\n`
  )
  console.log('JS file written')

  console.log('// --------------------------------------------')
}

sqipItems()