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browserless.js
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browserless.js
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'use strict'
const extractDomain = require('extract-domain')
const debug = require('debug')('browserless')
const puppeteer = require('puppeteer')
const tempy = require('tempy')
const { getDevice } = require('./devices')
const isTracker = require('./is-tracker')
const { promisify } = require('util')
const fs = require('fs')
const unlink = promisify(fs.unlink)
const unlinkSync = promisify(fs.unlinkSync)
const WAIT_UNTIL = ['networkidle2', 'load', 'domcontentloaded']
const EVALUATE_TEXT = page => page.evaluate(() => document.body.innerText)
const EVALUATE_HTML = page => page.content()
const isEmpty = val => val == null || !(Object.keys(val) || val).length
const isExternalUrl = (domainOne, domainTwo) => domainOne !== domainTwo
const createTempFile = opts => {
const tmp = tempy.file(opts)
return {
path: tmp,
cleanup: unlink.bind(unlink, tmp),
cleanupSync: unlinkSync.bind(unlinkSync, tmp)
}
}
// The puppeteer launch causes many events to be emitted.
process.setMaxListeners(0)
module.exports = ({
incognito = true,
timeout = 30000,
...launchOpts
} = {}) => {
let browser = puppeteer.launch({
ignoreHTTPSErrors: true,
args: [
'--disable-notifications',
'--disable-offer-store-unmasked-wallet-cards',
'--disable-offer-upload-credit-cards',
'--disable-setuid-sandbox',
'--enable-async-dns',
'--enable-simple-cache-backend',
'--enable-tcp-fast-open',
'--media-cache-size=33554432',
'--no-default-browser-check',
'--no-pings',
'--no-sandbox',
'--no-zygote',
'--prerender-from-omnibox=disabled'
],
...launchOpts
})
const newPage = () =>
Promise.resolve(browser).then(async browser => {
const context = incognito
? await browser.createIncognitoBrowserContext()
: browser
const page = await context.newPage()
page.setDefaultNavigationTimeout(timeout)
return page
})
const goto = async (
page,
{
url,
abortTrackers,
abortTypes,
waitFor,
waitUntil,
userAgent,
viewport,
args
}
) => {
await page.setRequestInterception(true)
let reqCount = { abort: 0, continue: 0 }
page.on('request', req => {
const resourceUrl = req.url()
const resourceType = req.resourceType()
if (abortTypes.includes(resourceType)) {
debug(`abort:${resourceType}:${++reqCount.abort}`, resourceUrl)
return req.abort()
}
const urlDomain = extractDomain(url)
const resourceDomain = extractDomain(resourceUrl)
const isExternal = isExternalUrl(urlDomain, resourceDomain)
if (abortTrackers && isExternal && isTracker(resourceDomain)) {
debug(`abort:tracker:${++reqCount.abort}`, resourceUrl)
return req.abort()
}
debug(`continue:${resourceType}:${++reqCount.continue}`, resourceUrl)
return req.continue()
})
if (userAgent) await page.setUserAgent(userAgent)
if (viewport) await page.setViewport(viewport)
const response = await page.goto(url, { waitUntil, ...args })
if (waitFor) await page.waitFor(waitFor)
debug(reqCount)
return response
}
const evaluate = fn => async (url, opts = {}) => {
const {
abortTrackers = true,
abortTypes = ['image', 'media', 'stylesheet', 'font'],
waitFor = 0,
waitUntil = WAIT_UNTIL,
userAgent,
viewport,
...args
} = opts
const page = await newPage()
const response = await goto(page, {
url,
abortTrackers,
abortTypes,
waitFor,
waitUntil,
userAgent,
viewport,
args
})
const content = await fn(page, response)
await page.close()
return content
}
const screenshot = async (url, opts = {}) => {
const {
abortTypes = [],
device: deviceName = 'macbook pro 13',
tmpOpts,
type = 'png',
userAgent,
viewport,
waitFor = 0,
waitUntil = WAIT_UNTIL,
...args
} = opts
const tempFile = createTempFile({ extension: type, ...tmpOpts })
const { userAgent: deviceUserAgent, viewport: deviceViewport } = getDevice(
deviceName
)
const page = await newPage()
await goto(page, {
userAgent: isEmpty(userAgent) ? deviceUserAgent : userAgent,
viewport: { ...deviceViewport, ...viewport },
url,
abortTypes,
waitFor,
waitUntil,
args
})
await page.screenshot({ path: tempFile.path, type, ...args })
await page.close()
return tempFile
}
const pdf = async (url, opts = {}) => {
const {
abortTrackers = false,
abortTypes = [],
device: deviceName = 'macbook pro 13',
format = 'A4',
margin = {
top: '0.25cm',
right: '0.25cm',
bottom: '0.25cm',
left: '0.25cm'
},
media = 'screen',
printBackground = true,
scale = 0.65,
tmpOpts,
userAgent,
viewport,
waitFor = 0,
waitUntil = WAIT_UNTIL,
...args
} = opts
const tempFile = createTempFile({ extension: 'pdf', ...tmpOpts })
const { userAgent: deviceUserAgent, viewport: deviceViewport } = getDevice(
deviceName
)
const page = await newPage()
await page.emulateMedia(media)
await goto(page, {
userAgent: isEmpty(userAgent) ? deviceUserAgent : userAgent,
viewport: { ...deviceViewport, ...viewport },
url,
abortTrackers,
abortTypes,
waitFor,
waitUntil,
args
})
await page.pdf({
path: tempFile.path,
margin,
format,
printBackground,
scale,
...args
})
await page.close()
return tempFile
}
return {
browser,
html: evaluate(EVALUATE_HTML),
text: evaluate(EVALUATE_TEXT),
evaluate,
pdf,
screenshot,
page: newPage,
goto
}
}