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generate-image.js
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generate-image.js
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require('dotenv').config()
const fetch = require('node-fetch')
const chromium = require('chrome-aws-lambda')
const cloudinary = require('cloudinary').v2
const helpers = require('../src/helpers/index.js')
const { slugify, objectToParams } = helpers
const local = process.env.NODE_ENV === 'development'
cloudinary.config({
cloud_name: process.env.CLOUDINARY_CLOUD,
api_key: process.env.CLOUDINARY_KEY,
api_secret: process.env.CLOUDINARY_SECRET
})
const cloudFolder = 'social-images'
const getImage = async function(title) {
const url = `https://res.cloudinary.com/${process.env.CLOUDINARY_CLOUD}/image/upload/${cloudFolder}/${title}.png`
return await fetch(url)
.then(result => {
if (result.status !== 404) {
return url
} else {
return null
}
})
}
const takeScreenshot = async function(url) {
const browser = await chromium.puppeteer.launch({
// launch desktop chrome on local??
executablePath: local ? '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome' : await chromium.executablePath,
args: chromium.args,
defaultViewport: chromium.defaultViewport,
headless: chromium.headless,
})
const page = await browser.newPage()
await page.setViewport({ height: 630, width: 1200 })
await page.goto(url)
const buffer = await page.screenshot()
await browser.close()
return `data:image/png;base64,${buffer.toString('base64')}`
}
const putImage = async function(title, image) {
const cloudinaryOptions = {
public_id: `${cloudFolder}/${title}`,
unique_filename: false
}
console.log(`uploading ${title} to cloudinary`)
return await cloudinary.uploader.upload(image, cloudinaryOptions)
.then(response => response.url)
}
const forwardResponse = async (imageUrl) => {
return {
statusCode: 308, // Permanent Redirect
headers: {
'location': cloudinary.url(imageUrl, { sign_url: true })
},
body: ''
}
}
exports.handler = async function(event) {
if (!event.queryStringParameters) {
console.log(`no params given`)
return
}
const title = slugify(event.queryStringParameters.title)
console.log(`processing ${title}...`)
const existingImage = await getImage(title)
if (existingImage) {
console.log(`yay, ${title} already existed`)
return forwardResponse(existingImage)
}
console.log(`generating image for ${title}`)
const url = local ? `http://${event.headers.host}` : `https://${event.headers.host}`
const imageParams = objectToParams(event.queryStringParameters)
const screenshot = await takeScreenshot(`${url}/generate-image?${imageParams}`)
const newImage = await putImage(title, screenshot)
console.log(`done with ${title}`)
return forwardResponse(newImage)
}