main
Mike Fix 4 years ago
parent fdbd4dc9a1
commit 16f95dc564
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GPG Key ID: 1D85E862314CA79F

@ -0,0 +1,117 @@
/* global domtoimage */
const qs = require('querystring')
const { json, send } = require('micro')
const chrome = require('chrome-aws-lambda')
const puppeteer = require('puppeteer-core')
// TODO expose local version of dom-to-image
const DOM_TO_IMAGE_URL = 'https://unpkg.com/dom-to-image@2.6.0/dist/dom-to-image.min.js'
const NOTO_COLOR_EMOJI_URL =
'https://raw.githack.com/googlei18n/noto-emoji/master/fonts/NotoColorEmoji.ttf'
module.exports = async (req, res) => {
// TODO proper auth
if (req.method === 'GET') {
if (
req.referer ||
(req.headers['user-agent'].indexOf('Twitterbot') < 0 &&
// Slack does not honor robots.txt: https://api.slack.com/robots
req.headers['user-agent'].indexOf('Slackbot') < 0 &&
req.headers['user-agent'].indexOf('Slack-ImgProxy') < 0)
) {
return send(res, 401, 'Unauthorized')
}
} else {
if (!req.headers.origin && !req.headers.authorization) {
return send(res, 401, 'Unauthorized')
}
}
const host = (req.headers && req.headers.host) || 'carbon.now.sh'
try {
await chrome.font(`https://${host}/static/fonts/NotoSansSC-Regular.otf`)
await chrome.font(NOTO_COLOR_EMOJI_URL)
} catch (e) {
console.error(e)
}
const browser = await puppeteer.launch({
args: chrome.args,
executablePath: await chrome.executablePath,
headless: chrome.headless,
})
try {
const { state, id, ...params } =
req.method === 'GET' ? req.query : await json(req, { limit: '6mb' })
const page = await browser.newPage()
const queryString = state ? `state=${state}` : qs.stringify(params)
await page.goto(`https://${host}/${id ? id : `?${queryString}`}`)
await page.addScriptTag({ url: DOM_TO_IMAGE_URL })
await page.waitForSelector('.export-container', { visible: true, timeout: 9500 })
const targetElement = await page.$('.export-container')
const dataUrl = await page.evaluate((target = document) => {
const query = new URLSearchParams(document.location.search)
const EXPORT_SIZES_HASH = {
'1x': '1',
'2x': '2',
'4x': '4',
}
const exportSize = EXPORT_SIZES_HASH[query.get('es')] || '2'
target.querySelectorAll('span[role="presentation"]').forEach(node => {
if (node.innerText && node.innerText.match(/%[A-Fa-f0-9]{2}/)) {
node.innerText.match(/%[A-Fa-f0-9]{2}/g).forEach(t => {
node.innerHTML = node.innerHTML.replace(t, encodeURIComponent(t))
})
}
})
const width = target.offsetWidth * exportSize
const height =
query.get('si') === 'true' || query.get('si') === true
? target.offsetWidth * exportSize
: target.offsetHeight * exportSize
const config = {
style: {
transform: `scale(${exportSize})`,
'transform-origin': 'center',
background: query.get('si') ? query.get('bg') : 'none',
},
filter: n => {
if (n.className) {
return String(n.className).indexOf('eliminateOnRender') < 0
}
return true
},
width,
height,
}
return domtoimage.toPng(target, config)
}, targetElement)
if (req.method === 'GET') {
res.setHeader('Content-Type', 'image/png')
const data = new Buffer(dataUrl.split(',')[1], 'base64')
return send(res, 200, data)
}
return send(res, 200, dataUrl)
} catch (e) {
// eslint-disable-next-line
console.error(e)
return send(res, 500)
} finally {
await browser.close()
}
}

@ -0,0 +1,58 @@
/*
* See oEmbed standard here: https://oembed.com/
*/
const url = require('url')
const { send } = require('micro')
const toIFrame = (url, width, height) =>
`<iframe
src="https://carbon.now.sh/embed${url}"
width="${width}px"
height="${height}px"
style="width:${width}px; height:${height}px; border:0; overflow:auto;"
sandbox="allow-scripts allow-same-origin"
scrolling="auto">
</iframe>
`
module.exports = (req, res) => {
let embedUrl = req.query.url
try {
embedUrl = decodeURIComponent(embedUrl)
} catch (e) {
// eslint-disable-next-line
console.log(e)
/* URL is already decoded */
}
try {
const { query: queryString, pathname } = url.parse(embedUrl)
const snippetID = pathname.split('/').pop()
const width = Math.min(Number(req.query.maxwidth) || Infinity, 1024)
const height = Math.min(Number(req.query.maxheight) || Infinity, 480)
const obj = {
version: '1.0',
type: 'rich',
provider_name: 'Carbon',
width,
height,
html: toIFrame(
`${snippetID && snippetID !== 'undefined' ? `/${snippetID}` : ''}?${
queryString ? queryString : ''
}`,
width,
height
)
}
return send(res, 200, obj)
} catch (e) {
// eslint-disable-next-line
console.error(e)
return send(res, 500, e.message)
}
}

@ -0,0 +1,12 @@
{
"engines": {
"node": "14.x"
},
"dependencies": {
"chrome-aws-lambda": "^8.0.2",
"dom-to-image": "^2.6.0",
"micro": "^9.3.4",
"puppeteer-core": "^9.0.0",
"tohash": "^1.0.2"
}
}

@ -2,7 +2,10 @@
"alias": "carbon.now.sh", "alias": "carbon.now.sh",
"version": 2, "version": 2,
"public": true, "public": true,
"builds": [{ "src": "package.json", "use": "@now/next" }], "builds": [
{ "src": "package.json", "use": "@now/next" },
{ "src": "api/image/index.js", "use": "@now/node", "config": { "maxLambdaSize": "40mb" } }
],
"routes": [ "routes": [
{ {
"src": "^/service-worker.js$", "src": "^/service-worker.js$",
@ -10,7 +13,18 @@
"headers": { "headers": {
"Service-Worker-Allowed": "/" "Service-Worker-Allowed": "/"
} }
} },
{
"src": "/api/oembed",
"dest": "api/oembed.js",
"headers": { "Access-Control-Allow-Origin": "*", "Access-Control-Allow-Headers": "*" }
},
{
"src": "/api/image/?(?<id>[^/]*)",
"dest": "api/image/index.js?id=$id",
"methods": ["POST", "GET"]
},
{ "src": "/api/.*", "status": 404 }
], ],
"github": { "github": {
"autoAlias": false, "autoAlias": false,

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