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index.js
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index.js
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/* global document */
import process from 'node:process';
import fs from 'node:fs/promises';
import path from 'node:path';
import {setTimeout} from 'node:timers/promises';
import fileUrl from 'file-url';
import puppeteer, {KnownDevices} from 'puppeteer';
import toughCookie from 'tough-cookie';
import {PuppeteerBlocker} from '@ghostery/adblocker-puppeteer';
const isUrl = string => /^(https?|file):\/\/|^data:/.test(string);
const assert = (value, message) => {
if (!value) {
throw new Error(message);
}
};
const validateOptions = options => {
assert(!(options.clip && options.element), 'The `clip` and `element` option are mutually exclusive');
assert(!(options.clip && options.fullPage), 'The `clip` and `fullPage` option are mutually exclusive');
};
const scrollToElement = (element, options) => {
const isOverflown = element => (
element.scrollHeight > element.clientHeight
|| element.scrollWidth > element.clientWidth
);
const findScrollParent = element => {
if (element === null) {
return;
}
if (isOverflown(element)) {
return element;
}
return findScrollParent(element.parentElement);
};
const calculateOffset = (rect, options) => {
if (options === undefined) {
return {
x: rect.left,
y: rect.top,
};
}
const offset = options.offset || 0;
switch (options.offsetFrom) {
case 'top': {
return {
x: rect.left,
y: rect.top + offset,
};
}
case 'right': {
return {
x: rect.left - offset,
y: rect.top,
};
}
case 'bottom': {
return {
x: rect.left,
y: rect.top - offset,
};
}
case 'left': {
return {
x: rect.left + offset,
y: rect.top,
};
}
default: {
throw new Error('Invalid `scrollToElement.offsetFrom` value');
}
}
};
const rect = element.getBoundingClientRect();
const offset = calculateOffset(rect, options);
const parent = findScrollParent(element);
if (parent !== undefined) {
parent.scrollIntoView(true);
parent.scrollTo(offset.x, offset.y);
}
};
const disableAnimations = () => {
const rule = `
*,
::before,
::after {
animation: initial !important;
transition: initial !important;
}
`;
const style = document.createElement('style');
document.body.append(style);
style.sheet.insertRule(rule);
};
const getBoundingClientRect = element => {
const {top, left, height, width, x, y} = element.getBoundingClientRect();
return {
top,
left,
height,
width,
x,
y,
};
};
const parseCookie = (url, cookie) => {
if (typeof cookie === 'object') {
return cookie;
}
const jar = new toughCookie.CookieJar(undefined, {rejectPublicSuffixes: false});
jar.setCookieSync(cookie, url);
const returnValue = jar.serializeSync().cookies[0];
// Use this instead of the above when the following issue is fixed:
// https://github.com/salesforce/tough-cookie/issues/149
// const ret = toughCookie.parse(cookie).serializeSync();
returnValue.name = returnValue.key;
delete returnValue.key;
returnValue.expires &&= Math.floor(new Date(returnValue.expires) / 1000);
return returnValue;
};
const internalCaptureWebsite = async (input, options) => {
options = {
launchOptions: {headless: 'new'},
...options,
};
const {launchOptions} = options;
validateOptions(options);
if (options.debug) {
launchOptions.headless = false;
launchOptions.slowMo = 100;
}
let browser;
let page;
try {
browser = options._browser || await puppeteer.launch(launchOptions);
page = await browser.newPage();
if (options.blockAds) {
const blocker = await PuppeteerBlocker.fromPrebuiltFull(fetch, {
path: 'engine.bin',
read: fs.readFile,
write: fs.writeFile,
});
await blocker.enableBlockingInPage(page);
}
return await internalCaptureWebsiteCore(input, options, page, browser);
} finally {
if (page) {
await page.close();
}
if (browser && !options._keepAlive) {
await browser.close();
}
}
};
const internalCaptureWebsiteCore = async (input, options, page, browser) => {
options = {
inputType: 'url',
width: 1280,
height: 800,
scaleFactor: 2,
fullPage: false,
defaultBackground: true,
timeout: 60, // The Puppeteer default of 30 is too short
delay: 0,
debug: false,
darkMode: false,
_keepAlive: false,
isJavaScriptEnabled: true,
blockAds: true,
inset: 0,
...options,
};
const isHTMLContent = options.inputType === 'html';
input = isHTMLContent || isUrl(input) ? input : fileUrl(input);
const timeoutInMilliseconds = options.timeout * 1000;
const viewportOptions = {
width: options.width,
height: options.height,
deviceScaleFactor: options.scaleFactor,
};
const screenshotOptions = {};
if (options.type) {
screenshotOptions.type = options.type;
}
if (typeof options.quality === 'number' && options.type && options.type !== 'png') {
screenshotOptions.quality = options.quality * 100;
}
if (options.fullPage) {
screenshotOptions.fullPage = options.fullPage;
}
if (typeof options.defaultBackground === 'boolean') {
screenshotOptions.omitBackground = !options.defaultBackground;
}
if (options.preloadFunction) {
await page.evaluateOnNewDocument(options.preloadFunction);
}
await page.setBypassCSP(true);
await page.setJavaScriptEnabled(options.isJavaScriptEnabled);
if (options.debug) {
page.on('console', message => {
let {url, lineNumber, columnNumber} = message.location();
lineNumber = lineNumber ? `:${lineNumber}` : '';
columnNumber = columnNumber ? `:${columnNumber}` : '';
const location = url ? ` (${url}${lineNumber}${columnNumber})` : '';
console.log(`\nPage log:${location}\n${message.text()}\n`);
});
page.on('pageerror', error => {
console.log('\nPage error:', error, '\n');
});
// TODO: Add more events from https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#event-requestfailed
}
if (options.authentication) {
await page.authenticate(options.authentication);
}
if (options.cookies) {
const cookies = options.cookies.map(cookie => parseCookie(isHTMLContent ? 'about:blank' : input, cookie));
await page.setCookie(...cookies);
}
if (options.headers) {
await page.setExtraHTTPHeaders(options.headers);
}
if (options.userAgent) {
await page.setUserAgent(options.userAgent);
}
if (options.clip) {
screenshotOptions.clip = options.clip;
}
await page.setViewport(viewportOptions);
if (options.emulateDevice) {
if (!(options.emulateDevice in KnownDevices)) {
throw new Error(`The device name \`${options.emulateDevice}\` is not supported`);
}
await page.emulate(KnownDevices[options.emulateDevice]);
}
await page.emulateMediaFeatures([{
name: 'prefers-color-scheme',
value: options.darkMode ? 'dark' : 'light',
}]);
await page[isHTMLContent ? 'setContent' : 'goto'](input, {
timeout: timeoutInMilliseconds,
waitUntil: 'networkidle2',
});
if (options.disableAnimations) {
await page.evaluate(disableAnimations, options.disableAnimations);
}
if (Array.isArray(options.hideElements) && options.hideElements.length > 0) {
await page.addStyleTag({
content: `${options.hideElements.join(', ')} { visibility: hidden !important; }`,
});
}
if (Array.isArray(options.removeElements) && options.removeElements.length > 0) {
await page.addStyleTag({
content: `${options.removeElements.join(', ')} { display: none !important; }`,
});
}
if (options.clickElement) {
await page.click(options.clickElement);
}
const getInjectKey = (extension, value) => isUrl(value) ? 'url' : (value.endsWith(`.${extension}`) ? 'path' : 'content');
if (!options.isJavaScriptEnabled) {
// Enable JavaScript again for `modules` and `scripts`.
await page.setJavaScriptEnabled(true);
}
if (options.modules) {
await Promise.all(options.modules.map(module_ => page.addScriptTag({
[getInjectKey('js', module_)]: module_,
type: 'module',
})));
}
if (options.scripts) {
await Promise.all(options.scripts.map(script => page.addScriptTag({
[getInjectKey('js', script)]: script,
})));
}
if (options.styles) {
await Promise.all(options.styles.map(style => page.addStyleTag({
[getInjectKey('css', style)]: style,
})));
}
if (options.waitForElement) {
await page.waitForSelector(options.waitForElement, {
visible: true,
timeout: timeoutInMilliseconds,
});
}
if (options.beforeScreenshot) {
await options.beforeScreenshot(page, browser);
}
if (options.element) {
await page.waitForSelector(options.element, {
visible: true,
timeout: timeoutInMilliseconds,
});
}
if (options.delay) {
await setTimeout(options.delay * 1000);
}
if (options.element) {
screenshotOptions.clip = await page.$eval(options.element, getBoundingClientRect);
screenshotOptions.fullPage = false;
}
if (options.scrollToElement) {
// eslint-disable-next-line unicorn/prefer-ternary
if (typeof options.scrollToElement === 'object') {
await page.$eval(options.scrollToElement.element, scrollToElement, options.scrollToElement);
} else {
await page.$eval(options.scrollToElement, scrollToElement);
}
}
if (screenshotOptions.fullPage) {
// Get the height of the rendered page
const bodyHandle = await page.$('body');
const bodyBoundingBox = await bodyHandle.boundingBox();
await bodyHandle.dispose();
// Scroll one viewport at a time, pausing to let content load
const viewportHeight = viewportOptions.height;
let viewportIncrement = 0;
while (viewportIncrement + viewportHeight < bodyBoundingBox.height) {
const navigationPromise = page.waitForNetworkIdle();
/* eslint-disable no-await-in-loop */
await page.evaluate(_viewportHeight => {
/* eslint-disable no-undef */
window.scrollBy(0, _viewportHeight);
/* eslint-enable no-undef */
}, viewportHeight);
await navigationPromise;
/* eslint-enable no-await-in-loop */
viewportIncrement += viewportHeight;
}
// Scroll back to top
await page.evaluate(_ => {
/* eslint-disable no-undef */
window.scrollTo(0, 0);
/* eslint-enable no-undef */
});
}
if (options.inset && !screenshotOptions.fullPage) {
const inset = {
top: 0,
right: 0,
bottom: 0,
left: 0,
};
for (const key of Object.keys(inset)) {
inset[key] = typeof options.inset === 'number' ? options.inset : (options.inset[key] ?? 0);
}
let clipOptions = screenshotOptions.clip;
clipOptions ||= await page.evaluate(() => ({
x: 0,
y: 0,
/* eslint-disable no-undef */
height: window.innerHeight,
width: window.innerWidth,
/* eslint-enable no-undef */
}));
const x = clipOptions.x + inset.left;
const y = clipOptions.y + inset.top;
const width = clipOptions.width - (inset.left + inset.right);
const height = clipOptions.height - (inset.top + inset.bottom);
if (width === 0 || height === 0) {
throw new Error('When using the `clip` option, the width or height of the screenshot cannot be equal to 0.');
}
screenshotOptions.clip = {
x,
y,
width,
height,
};
}
const buffer = await page.screenshot(screenshotOptions);
return buffer;
};
const captureWebsite = {};
captureWebsite.file = async (url, filePath, options = {}) => {
const screenshot = await internalCaptureWebsite(url, options);
await fs.mkdir(path.dirname(filePath), {recursive: true});
await fs.writeFile(filePath, screenshot, {
flag: options.overwrite ? 'w' : 'wx',
});
};
captureWebsite.buffer = async (url, options) => new Uint8Array(await internalCaptureWebsite(url, options));
captureWebsite.base64 = async (url, options) => {
const screenshot = await internalCaptureWebsite(url, options);
return screenshot.toString('base64');
};
if (process.env.NODE_ENV === 'test') {
captureWebsite._startBrowser = puppeteer.launch.bind(puppeteer);
}
export default captureWebsite;
export const devices = Object.values(KnownDevices).map(device => device.name);