1054 lines
32 KiB
JavaScript
1054 lines
32 KiB
JavaScript
/* eslint-disable no-undef */
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/* eslint-disable no-empty */
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/* eslint-disable @typescript-eslint/explicit-function-return-type */
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/* eslint-disable @typescript-eslint/no-var-requires */
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/* eslint-disable @typescript-eslint/no-require-imports */
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const { encode } = require("urlsafe-base64");
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const crypto = require("crypto");
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const Url = require('url');
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const axios = require('axios');
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const jwt = require('jsonwebtoken');
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const { promisify } = require('util');
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const signToken = promisify(jwt.sign);
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const os = require('os');
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const { Storage } = require('@google-cloud/storage');
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const { parseHTML } = require('linkedom');
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const { preHandleContent, preParseContent } = require("@omnivore/content-handler");
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const { Readability } = require("@omnivore/readability");
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const puppeteer = require('puppeteer-extra');
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// Add stealth plugin to hide puppeteer usage
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const StealthPlugin = require('puppeteer-extra-plugin-stealth');
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puppeteer.use(StealthPlugin());
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// Add adblocker plugin to block all ads and trackers (saves bandwidth)
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const AdblockerPlugin = require('puppeteer-extra-plugin-adblocker');
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puppeteer.use(AdblockerPlugin({ blockTrackers: true }));
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const createDOMPurify = require("dompurify");
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const storage = new Storage();
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const ALLOWED_ORIGINS = process.env.ALLOWED_ORIGINS ? process.env.ALLOWED_ORIGINS.split(',') : [];
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const previewBucket = process.env.PREVIEW_IMAGE_BUCKET ? storage.bucket(process.env.PREVIEW_IMAGE_BUCKET) : undefined;
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const filePath = `${os.tmpdir()}/previewImage.png`;
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const MOBILE_USER_AGENT = 'Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.62 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)'
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const DESKTOP_USER_AGENT = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 11_6_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4372.0 Safari/537.36'
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const BOT_DESKTOP_USER_AGENT = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 11_6_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4372.0 Safari/537.36'
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const NON_BOT_DESKTOP_USER_AGENT = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 11_6_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4372.0 Safari/537.36'
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const NON_BOT_HOSTS = ['bloomberg.com', 'forbes.com']
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const NON_SCRIPT_HOSTS= ['medium.com', 'fastcompany.com', 'fortelabs.com'];
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const ALLOWED_CONTENT_TYPES = ['text/html', 'application/octet-stream', 'text/plain', 'application/pdf'];
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const IMPORTER_METRICS_COLLECTOR_URL = process.env.IMPORTER_METRICS_COLLECTOR_URL;
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const REQUEST_TIMEOUT = 30000; // 30 seconds
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const MAX_RETRY_COUNT = process.env.MAX_RETRY_COUNT || '1';
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const userAgentForUrl = (url) => {
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try {
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const u = new URL(url);
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for (const host of NON_BOT_HOSTS) {
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if (u.hostname.endsWith(host)) {
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return NON_BOT_DESKTOP_USER_AGENT;
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}
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}
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} catch (e) {
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console.log('error getting user agent for url', url, e)
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}
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return DESKTOP_USER_AGENT
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};
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const fetchContentWithScrapingBee = async (url) => {
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try {
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const response = await axios.get('https://app.scrapingbee.com/api/v1', {
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params: {
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'api_key': process.env.SCRAPINGBEE_API_KEY,
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'url': url,
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'render_js': 'false',
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'premium_proxy': 'true',
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'country_code':'us'
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},
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timeout: REQUEST_TIMEOUT,
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})
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const dom = parseHTML(response.data).document;
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return { title: dom.title, domContent: dom.documentElement.outerHTML, url }
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} catch (e) {
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console.error('error fetching with scrapingbee', e.message)
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return { title: url, domContent: '', url }
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}
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}
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const enableJavascriptForUrl = (url) => {
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try {
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const u = new URL(url);
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for (const host of NON_SCRIPT_HOSTS) {
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if (u.hostname.endsWith(host)) {
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return false;
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}
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}
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} catch (e) {
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console.log('error getting hostname for url', url, e)
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}
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return true
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};
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// launch Puppeteer
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const getBrowserPromise = (async () => {
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console.log("starting puppeteer browser")
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return puppeteer.launch({
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args: [
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'--allow-running-insecure-content',
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'--autoplay-policy=user-gesture-required',
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'--disable-component-update',
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'--disable-domain-reliability',
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'--disable-features=AudioServiceOutOfProcess,IsolateOrigins,site-per-process',
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'--disable-print-preview',
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'--disable-setuid-sandbox',
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'--disable-site-isolation-trials',
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'--disable-speech-api',
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'--disable-web-security',
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'--disk-cache-size=33554432',
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'--enable-features=SharedArrayBuffer',
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'--hide-scrollbars',
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'--disable-gpu',
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'--mute-audio',
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'--no-default-browser-check',
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'--no-pings',
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'--no-sandbox',
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'--no-zygote',
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'--window-size=1920,1080',
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'--disable-extensions',
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].filter((item) => !!item),
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defaultViewport: {
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deviceScaleFactor: 1,
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hasTouch: false,
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height: 1080,
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isLandscape: true,
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isMobile: false,
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width: 1920
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},
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executablePath: process.env.CHROMIUM_PATH,
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headless: !!process.env.LAUNCH_HEADLESS,
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timeout: 120000, // 2 minutes
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});
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})();
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const uploadToSignedUrl = async ({ id, uploadSignedUrl }, contentType, contentObjUrl) => {
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try {
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const stream = await axios.get(contentObjUrl, { responseType: 'stream', timeout: REQUEST_TIMEOUT });
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return axios.put(uploadSignedUrl, stream.data, {
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headers: {
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'Content-Type': contentType,
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},
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maxBodyLength: 1000000000,
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maxContentLength: 100000000,
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timeout: REQUEST_TIMEOUT,
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});
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} catch (error) {
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console.error('error uploading to signed url', error.message);
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return null;
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}
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};
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const getUploadIdAndSignedUrl = async (userId, url, articleSavingRequestId) => {
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const auth = await signToken({ uid: userId }, process.env.JWT_SECRET);
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const data = JSON.stringify({
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query: `mutation UploadFileRequest($input: UploadFileRequestInput!) {
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uploadFileRequest(input:$input) {
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... on UploadFileRequestError {
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errorCodes
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}
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... on UploadFileRequestSuccess {
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id
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uploadSignedUrl
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}
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}
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}`,
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variables: {
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input: {
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url,
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contentType: 'application/pdf',
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clientRequestId: articleSavingRequestId,
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}
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}
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});
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try {
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const response = await axios.post(`${process.env.REST_BACKEND_ENDPOINT}/graphql`, data,
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{
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headers: {
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Cookie: `auth=${auth};`,
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'Content-Type': 'application/json',
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},
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timeout: REQUEST_TIMEOUT,
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});
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if (response.data.data.uploadFileRequest.errorCodes && response.data.data.uploadFileRequest.errorCodes.length > 0) {
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console.error('Error while getting upload id and signed url', response.data.data.uploadFileRequest.errorCodes[0]);
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return null;
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}
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return response.data.data.uploadFileRequest;
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} catch (e) {
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console.error('error getting upload id and signed url', e.message);
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return null;
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}
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};
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const uploadPdf = async (url, userId, articleSavingRequestId) => {
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validateUrlString(url);
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const uploadResult = await getUploadIdAndSignedUrl(userId, url, articleSavingRequestId);
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if (!uploadResult) {
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throw new Error('error while getting upload id and signed url');
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}
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const uploaded = await uploadToSignedUrl(uploadResult, 'application/pdf', url);
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if (!uploaded) {
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throw new Error('error while uploading pdf');
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}
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return uploadResult.id;
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};
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const sendCreateArticleMutation = async (userId, input) => {
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const data = JSON.stringify({
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query: `mutation CreateArticle ($input: CreateArticleInput!){
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createArticle(input:$input){
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... on CreateArticleSuccess{
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createdArticle{
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id
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}
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}
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... on CreateArticleError{
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errorCodes
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}
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}
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}`,
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variables: {
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input,
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},
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});
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const auth = await signToken({ uid: userId }, process.env.JWT_SECRET);
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try {
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const response = await axios.post(`${process.env.REST_BACKEND_ENDPOINT}/graphql`, data,
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{
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headers: {
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Cookie: `auth=${auth};`,
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'Content-Type': 'application/json',
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},
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timeout: REQUEST_TIMEOUT,
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});
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if (response.data.data.createArticle.errorCodes && response.data.data.createArticle.errorCodes.length > 0) {
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console.error('error while creating article', response.data.data.createArticle.errorCodes[0]);
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return null;
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}
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return response.data.data.createArticle;
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} catch (error) {
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console.error('error creating article', error.message);
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return null;
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}
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};
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const sendSavePageMutation = async (userId, input) => {
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const data = JSON.stringify({
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query: `mutation SavePage ($input: SavePageInput!){
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savePage(input:$input){
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... on SaveSuccess{
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url
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clientRequestId
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}
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... on SaveError{
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errorCodes
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}
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}
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}`,
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variables: {
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input,
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},
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});
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const auth = await signToken({ uid: userId }, process.env.JWT_SECRET);
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try {
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const response = await axios.post(`${process.env.REST_BACKEND_ENDPOINT}/graphql`, data,
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{
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headers: {
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Cookie: `auth=${auth};`,
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'Content-Type': 'application/json',
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},
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timeout: REQUEST_TIMEOUT,
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});
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if (response.data.data.savePage.errorCodes && response.data.data.savePage.errorCodes.length > 0) {
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console.error('error while saving page', response.data.data.savePage.errorCodes[0]);
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if (response.data.data.savePage.errorCodes[0] === 'UNAUTHORIZED') {
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return { error: 'UNAUTHORIZED' };
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}
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return null;
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}
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return response.data.data.savePage;
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} catch (error) {
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console.error('error saving page', error.message);
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return null;
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}
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};
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const saveUploadedPdf = async (userId, url, uploadFileId, articleSavingRequestId) => {
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return sendCreateArticleMutation(userId, {
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url: encodeURI(url),
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articleSavingRequestId,
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uploadFileId: uploadFileId,
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state,
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labels,
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source,
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folder,
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},
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);
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};
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const sendImportStatusUpdate = async (userId, taskId, status) => {
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try {
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const auth = await signToken({ uid: userId }, process.env.JWT_SECRET);
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await axios.post(
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IMPORTER_METRICS_COLLECTOR_URL,
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{
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taskId,
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status,
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},
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{
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headers: {
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'Authorization': auth,
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'Content-Type': 'application/json',
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},
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timeout: REQUEST_TIMEOUT,
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});
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} catch (e) {
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console.error('error while sending import status update', e);
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}
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};
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async function fetchContent(req, res) {
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let functionStartTime = Date.now();
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const userId = (req.query ? req.query.userId : undefined) || (req.body ? req.body.userId : undefined);
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const articleSavingRequestId = (req.query ? req.query.saveRequestId : undefined) || (req.body ? req.body.saveRequestId : undefined);
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const state = req.body.state
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const labels = req.body.labels
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const source = req.body.source || 'puppeteer-parse';
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const taskId = req.body.taskId; // taskId is used to update import status
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const urlStr = (req.query ? req.query.url : undefined) || (req.body ? req.body.url : undefined);
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const locale = (req.query ? req.query.locale : undefined) || (req.body ? req.body.locale : undefined);
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const timezone = (req.query ? req.query.timezone : undefined) || (req.body ? req.body.timezone : undefined);
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const rssFeedUrl = req.body.rssFeedUrl;
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const savedAt = req.body.savedAt;
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const publishedAt = req.body.publishedAt;
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const folder = req.body.folder;
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let logRecord = {
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url: urlStr,
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userId,
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articleSavingRequestId,
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labels: {
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source,
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},
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state,
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labelsToAdd: labels,
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taskId: taskId,
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locale,
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timezone,
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rssFeedUrl,
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savedAt,
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publishedAt,
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folder,
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};
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console.info(`Article parsing request`, logRecord);
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let url, context, page, finalUrl, title, content, contentType, importStatus, statusCode = 200;
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try {
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url = getUrl(urlStr);
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if (!url) {
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logRecord.urlIsInvalid = true;
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logRecord.error = 'Valid URL to parse not specified';
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statusCode = 400;
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return;
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}
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// pre handle url with custom handlers
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try {
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const browser = await getBrowserPromise;
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const result = await preHandleContent(url, browser);
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if (result && result.url) {
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validateUrlString(url);
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url = result.url;
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}
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if (result && result.title) { title = result.title }
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if (result && result.content) { content = result.content }
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if (result && result.contentType) { contentType = result.contentType }
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} catch (e) {
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console.info('error with handler: ', e);
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}
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if ((!content || !title) && contentType !== 'application/pdf') {
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const result = await retrievePage(url, logRecord, functionStartTime, locale, timezone);
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if (result && result.context) { context = result.context }
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if (result && result.page) { page = result.page }
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if (result && result.finalUrl) { finalUrl = result.finalUrl }
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if (result && result.contentType) { contentType = result.contentType }
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} else {
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finalUrl = url
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}
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|
|
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if (contentType === 'application/pdf') {
|
|
const uploadFileId = await uploadPdf(finalUrl, userId, articleSavingRequestId);
|
|
const uploadedPdf = await sendCreateArticleMutation(userId, {
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url: encodeURI(finalUrl),
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|
articleSavingRequestId,
|
|
uploadFileId,
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|
state,
|
|
labels,
|
|
source,
|
|
folder,
|
|
rssFeedUrl,
|
|
savedAt,
|
|
publishedAt,
|
|
});
|
|
if (!uploadedPdf) {
|
|
statusCode = 500;
|
|
logRecord.error = 'error while saving uploaded pdf';
|
|
} else {
|
|
importStatus = 'imported';
|
|
}
|
|
} else {
|
|
if (!content || !title) {
|
|
const result = await retrieveHtml(page, logRecord);
|
|
if (result.isBlocked) {
|
|
const sbResult = await fetchContentWithScrapingBee(url)
|
|
title = sbResult.title
|
|
content = sbResult.domContent
|
|
} else {
|
|
title = result.title;
|
|
content = result.domContent;
|
|
}
|
|
} else {
|
|
console.info('using prefetched content and title');
|
|
}
|
|
logRecord.fetchContentTime = Date.now() - functionStartTime;
|
|
}
|
|
} catch (e) {
|
|
logRecord.error = e.message;
|
|
console.error(`Error while retrieving page`, logRecord);
|
|
statusCode = 500;
|
|
|
|
// fallback to scrapingbee for non pdf content
|
|
if (url && contentType !== 'application/pdf') {
|
|
console.info('fallback to scrapingbee', url);
|
|
|
|
const fetchStartTime = Date.now();
|
|
const sbResult = await fetchContentWithScrapingBee(url);
|
|
content = sbResult.domContent;
|
|
title = sbResult.title;
|
|
logRecord.fetchContentTime = Date.now() - fetchStartTime;
|
|
statusCode = 200;
|
|
}
|
|
} finally {
|
|
// close browser context if it was opened
|
|
if (context) {
|
|
await context.close();
|
|
}
|
|
// save non pdf content
|
|
if (url && contentType !== 'application/pdf') {
|
|
// parse content if it is not empty
|
|
let readabilityResult = null;
|
|
if (content) {
|
|
let document = parseHTML(content).document;
|
|
// preParse content
|
|
const preParsedDom = await preParseContent(url, document)
|
|
if (preParsedDom) {
|
|
document = preParsedDom
|
|
}
|
|
readabilityResult = await getReadabilityResult(url, document);
|
|
}
|
|
|
|
const apiResponse = await sendSavePageMutation(userId, {
|
|
url,
|
|
clientRequestId: articleSavingRequestId,
|
|
title,
|
|
originalContent: content,
|
|
parseResult: readabilityResult,
|
|
state,
|
|
labels,
|
|
rssFeedUrl,
|
|
savedAt,
|
|
publishedAt,
|
|
source,
|
|
folder,
|
|
});
|
|
if (!apiResponse) {
|
|
logRecord.error = 'error while saving page';
|
|
statusCode = 500;
|
|
} else if (apiResponse.error === 'UNAUTHORIZED') {
|
|
console.info('user is deleted, do not retry', logRecord);
|
|
return res.sendStatus(200);
|
|
} else {
|
|
importStatus = readabilityResult ? 'imported' : 'failed';
|
|
}
|
|
}
|
|
|
|
logRecord.totalTime = Date.now() - functionStartTime;
|
|
console.info(`parse-page`, logRecord);
|
|
|
|
// mark import failed on the last failed retry
|
|
const retryCount = req.headers['x-cloudtasks-taskretrycount'];
|
|
if (retryCount == MAX_RETRY_COUNT) {
|
|
console.info('max retry count reached');
|
|
importStatus = importStatus || 'failed';
|
|
}
|
|
|
|
// send import status to update the metrics
|
|
if (taskId && importStatus) {
|
|
await sendImportStatusUpdate(userId, taskId, importStatus);
|
|
}
|
|
|
|
res.sendStatus(statusCode);
|
|
}
|
|
}
|
|
|
|
function validateUrlString(url) {
|
|
const u = new URL(url);
|
|
// Make sure the URL is http or https
|
|
if (u.protocol !== 'http:' && u.protocol !== 'https:') {
|
|
throw new Error('Invalid URL protocol check failed')
|
|
}
|
|
// Make sure the domain is not localhost
|
|
if (u.hostname === 'localhost' || u.hostname === '0.0.0.0') {
|
|
throw new Error('Invalid URL is localhost')
|
|
}
|
|
// Make sure the domain is not a private IP
|
|
if (/^(10|172\.16|192\.168)\..*/.test(u.hostname)) {
|
|
throw new Error('Invalid URL is private ip')
|
|
}
|
|
}
|
|
|
|
function tryParseUrl(urlStr) {
|
|
if (!urlStr) {
|
|
return null;
|
|
}
|
|
|
|
// a regular expression to match all URLs
|
|
const regex = /(https?:\/\/[^\s]+)/g;
|
|
|
|
const matches = urlStr.match(regex);
|
|
|
|
if (matches) {
|
|
return matches[0]; // only return first match
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
function getUrl(urlStr) {
|
|
const url = tryParseUrl(urlStr)
|
|
if (!url) {
|
|
throw new Error('No URL specified');
|
|
}
|
|
|
|
validateUrlString(url);
|
|
|
|
const parsed = Url.parse(url);
|
|
return parsed.href;
|
|
}
|
|
|
|
async function retrievePage(url, logRecord, functionStartTime, locale, timezone) {
|
|
validateUrlString(url);
|
|
|
|
const browser = await getBrowserPromise;
|
|
logRecord.timing = { ...logRecord.timing, browserOpened: Date.now() - functionStartTime };
|
|
|
|
const context = await browser.createIncognitoBrowserContext();
|
|
const page = await context.newPage()
|
|
|
|
if (!enableJavascriptForUrl(url)) {
|
|
await page.setJavaScriptEnabled(false);
|
|
}
|
|
await page.setUserAgent(userAgentForUrl(url));
|
|
|
|
// set locale for the page
|
|
if (locale) {
|
|
await page.setExtraHTTPHeaders({ 'Accept-Language': locale });
|
|
}
|
|
|
|
// set timezone for the page
|
|
if (timezone) {
|
|
await page.emulateTimezone(timezone);
|
|
}
|
|
|
|
const client = await page.target().createCDPSession();
|
|
|
|
// intercept request when response headers was received
|
|
await client.send('Network.setRequestInterception', {
|
|
patterns: [
|
|
{
|
|
urlPattern: '*',
|
|
resourceType: 'Document',
|
|
interceptionStage: 'HeadersReceived',
|
|
},
|
|
],
|
|
});
|
|
|
|
const path = require('path');
|
|
const download_path = path.resolve('./download_dir/');
|
|
|
|
await client.send('Page.setDownloadBehavior', {
|
|
behavior: 'allow',
|
|
userDataDir: './',
|
|
downloadPath: download_path,
|
|
})
|
|
|
|
client.on('Network.requestIntercepted', async e => {
|
|
const headers = e.responseHeaders || {};
|
|
|
|
const [contentType] = (headers['content-type'] || headers['Content-Type'] || '')
|
|
.toLowerCase()
|
|
.split(';');
|
|
const obj = { interceptionId: e.interceptionId };
|
|
|
|
if (e.responseStatusCode >= 200 && e.responseStatusCode < 300) {
|
|
// We only check content-type on success responses
|
|
// as it doesn't matter what the content type is for things
|
|
// like redirects
|
|
if (contentType && !ALLOWED_CONTENT_TYPES.includes(contentType)) {
|
|
obj['errorReason'] = 'BlockedByClient';
|
|
}
|
|
}
|
|
|
|
try {
|
|
await client.send('Network.continueInterceptedRequest', obj);
|
|
// eslint-disable-next-line no-empty
|
|
} catch {}
|
|
});
|
|
|
|
/*
|
|
* Disallow MathJax from running in Puppeteer and modifying the document,
|
|
* we shall instead run it in our frontend application to transform any
|
|
* mathjax content when present.
|
|
*/
|
|
await page.setRequestInterception(true);
|
|
let requestCount = 0;
|
|
page.on('request', request => {
|
|
if (request.resourceType() === 'font') {
|
|
// Disallow fonts from loading
|
|
request.abort();
|
|
return;
|
|
}
|
|
if (requestCount++ > 100) {
|
|
request.abort();
|
|
return;
|
|
}
|
|
if (
|
|
request.resourceType() === 'script' &&
|
|
request.url().toLowerCase().indexOf('mathjax') > -1
|
|
) {
|
|
request.abort();
|
|
return
|
|
}
|
|
request.continue();
|
|
});
|
|
|
|
// Puppeteer fails during download of PDf files,
|
|
// so record the failure and use those items
|
|
let lastPdfUrl = undefined;
|
|
page.on('response', response => {
|
|
if (response.headers()['content-type'] === 'application/pdf') {
|
|
lastPdfUrl = response.url();
|
|
}
|
|
});
|
|
|
|
try {
|
|
const response = await page.goto(url, { timeout: 30 * 1000, waitUntil: ['networkidle2'] });
|
|
const finalUrl = response.url();
|
|
const contentType = response.headers()['content-type'];
|
|
|
|
logRecord.finalUrl = response.url();
|
|
logRecord.contentType = response.headers()['content-type'];
|
|
|
|
return { context, page, response, finalUrl, contentType };
|
|
} catch (error) {
|
|
if (lastPdfUrl) {
|
|
return { context, page, finalUrl: lastPdfUrl, contentType: 'application/pdf' };
|
|
}
|
|
await context.close();
|
|
throw error;
|
|
}
|
|
}
|
|
|
|
async function retrieveHtml(page, logRecord) {
|
|
let domContent = '', title;
|
|
try {
|
|
title = await page.title();
|
|
logRecord.title = title;
|
|
|
|
const pageScrollingStart = Date.now();
|
|
/* scroll with a 5 seconds timeout */
|
|
await Promise.race([
|
|
new Promise(resolve => {
|
|
(async function () {
|
|
try {
|
|
await page.evaluate(`(async () => {
|
|
/* credit: https://github.com/puppeteer/puppeteer/issues/305 */
|
|
return new Promise((resolve, reject) => {
|
|
let scrollHeight = document.body.scrollHeight;
|
|
let totalHeight = 0;
|
|
let distance = 500;
|
|
let timer = setInterval(() => {
|
|
window.scrollBy(0, distance);
|
|
totalHeight += distance;
|
|
if(totalHeight >= scrollHeight){
|
|
clearInterval(timer);
|
|
resolve(true);
|
|
}
|
|
}, 10);
|
|
});
|
|
})()`);
|
|
} catch (e) {
|
|
logRecord.scrollError = true;
|
|
} finally {
|
|
resolve(true);
|
|
}
|
|
})();
|
|
}),
|
|
page.waitForTimeout(5000),
|
|
]);
|
|
logRecord.timing = { ...logRecord.timing, pageScrolled: Date.now() - pageScrollingStart };
|
|
|
|
const iframes = {};
|
|
const urls = [];
|
|
const framesPromises = [];
|
|
const allowedUrls = /instagram\.com/gi;
|
|
|
|
for (const frame of page.mainFrame().childFrames()) {
|
|
if (frame.url() && allowedUrls.test(frame.url())) {
|
|
urls.push(frame.url());
|
|
framesPromises.push(frame.evaluate(el => el.innerHTML, await frame.$('body')));
|
|
}
|
|
}
|
|
|
|
(await Promise.all(framesPromises)).forEach((frame, index) => (iframes[urls[index]] = frame));
|
|
|
|
const domContentCapturingStart = Date.now();
|
|
// get document body with all hidden elements removed
|
|
domContent = await page.evaluate(iframes => {
|
|
const BI_SRC_REGEXP = /url\("(.+?)"\)/gi;
|
|
|
|
Array.from(document.body.getElementsByTagName('*')).forEach(el => {
|
|
const style = window.getComputedStyle(el);
|
|
|
|
try {
|
|
// Removing blurred images since they are mostly the copies of lazy loaded ones
|
|
if (el.tagName && ['img', 'image'].includes(el.tagName.toLowerCase())) {
|
|
const filter = style.getPropertyValue('filter');
|
|
if (filter && filter.startsWith('blur')) {
|
|
el.parentNode && el.parentNode.removeChild(el);
|
|
}
|
|
}
|
|
} catch (err) {
|
|
// throw Error('error with element: ' + JSON.stringify(Array.from(document.body.getElementsByTagName('*'))))
|
|
}
|
|
|
|
// convert all nodes with background image to img nodes
|
|
if (!['', 'none'].includes(style.getPropertyValue('background-image'))) {
|
|
const filter = style.getPropertyValue('filter');
|
|
// avoiding image nodes with a blur effect creation
|
|
if (filter && filter.startsWith('blur')) {
|
|
el && el.parentNode && el.parentNode.removeChild(el);
|
|
} else {
|
|
const matchedSRC = BI_SRC_REGEXP.exec(style.getPropertyValue('background-image'));
|
|
// Using "g" flag with a regex we have to manually break down lastIndex to zero after every usage
|
|
// More details here: https://stackoverflow.com/questions/1520800/why-does-a-regexp-with-global-flag-give-wrong-results
|
|
BI_SRC_REGEXP.lastIndex = 0;
|
|
|
|
if (matchedSRC && matchedSRC[1] && !el.src) {
|
|
// Replacing element only of there are no content inside, b/c might remove important div with content.
|
|
// Article example: http://www.josiahzayner.com/2017/01/genetic-designer-part-i.html
|
|
// DIV with class "content-inner" has `url("https://resources.blogblog.com/blogblog/data/1kt/travel/bg_container.png")` background image.
|
|
if (!el.textContent) {
|
|
const img = document.createElement('img');
|
|
img.src = matchedSRC[1];
|
|
el && el.parentNode && el.parentNode.replaceChild(img, el);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (el.tagName === 'IFRAME') {
|
|
if (iframes[el.src]) {
|
|
const newNode = document.createElement('div');
|
|
newNode.className = 'omnivore-instagram-embed';
|
|
newNode.innerHTML = iframes[el.src];
|
|
el && el.parentNode && el.parentNode.replaceChild(newNode, el);
|
|
}
|
|
}
|
|
});
|
|
|
|
if (document.querySelector('[data-translate="managed_checking_msg"]') ||
|
|
document.getElementById('px-block-form-wrapper')) {
|
|
return 'IS_BLOCKED'
|
|
}
|
|
|
|
return document.documentElement.outerHTML;
|
|
}, iframes);
|
|
logRecord.puppeteerSuccess = true;
|
|
logRecord.timing = {
|
|
...logRecord.timing,
|
|
contenCaptured: Date.now() - domContentCapturingStart,
|
|
};
|
|
|
|
// [END puppeteer-block]
|
|
} catch (e) {
|
|
if (e.message.startsWith('net::ERR_BLOCKED_BY_CLIENT at ')) {
|
|
logRecord.blockedByClient = true;
|
|
} else {
|
|
logRecord.puppeteerSuccess = false;
|
|
logRecord.puppeteerError = {
|
|
message: e.message,
|
|
stack: e.stack,
|
|
};
|
|
}
|
|
}
|
|
if (domContent === 'IS_BLOCKED') {
|
|
return { isBlocked: true };
|
|
}
|
|
return { domContent, title };
|
|
}
|
|
|
|
async function preview(req, res) {
|
|
const functionStartTime = Date.now();
|
|
// Grabbing execution and trace ids to attach logs to the appropriate function call
|
|
const execution_id = req.get('function-execution-id');
|
|
const traceId = (req.get('x-cloud-trace-context') || '').split('/')[0];
|
|
const console = buildconsole('cloudfunctions.googleapis.com%2Fcloud-functions', {
|
|
trace: `projects/${process.env.GCLOUD_PROJECT}/traces/${traceId}`,
|
|
labels: {
|
|
execution_id: execution_id,
|
|
},
|
|
});
|
|
|
|
if (!process.env.PREVIEW_IMAGE_BUCKET) {
|
|
console.error(`PREVIEW_IMAGE_BUCKET not set`)
|
|
return res.sendStatus(500);
|
|
}
|
|
|
|
const urlStr = (req.query ? req.query.url : undefined) || (req.body ? req.body.url : undefined);
|
|
const url = getUrl(urlStr);
|
|
console.log('preview request url', url);
|
|
|
|
const logRecord = {
|
|
url,
|
|
query: req.query,
|
|
origin: req.get('Origin'),
|
|
labels: {
|
|
source: 'publicImagePreview',
|
|
},
|
|
};
|
|
|
|
console.info(`Public preview image generation request`, logRecord);
|
|
|
|
if (!url) {
|
|
logRecord.urlIsInvalid = true;
|
|
console.error(`Valid URL to parse is not specified`, logRecord);
|
|
return res.sendStatus(400);
|
|
}
|
|
const { origin } = new URL(url);
|
|
if (!ALLOWED_ORIGINS.some(o => o === origin)) {
|
|
logRecord.forbiddenOrigin = true;
|
|
console.error(`This origin is not allowed: ${origin}`, logRecord);
|
|
return res.sendStatus(400);
|
|
}
|
|
|
|
const browser = await getBrowserPromise;
|
|
logRecord.timing = { ...logRecord.timing, browserOpened: Date.now() - functionStartTime };
|
|
|
|
const page = await browser.newPage();
|
|
const pageLoadingStart = Date.now();
|
|
const modifiedUrl = new URL(url);
|
|
modifiedUrl.searchParams.append('fontSize', '24');
|
|
modifiedUrl.searchParams.append('adjustAspectRatio', '1.91');
|
|
try {
|
|
await page.goto(modifiedUrl.toString());
|
|
logRecord.timing = { ...logRecord.timing, pageLoaded: Date.now() - pageLoadingStart };
|
|
} catch (error) {
|
|
console.log('error going to page: ', modifiedUrl)
|
|
console.log(error)
|
|
throw error
|
|
}
|
|
|
|
// We lookup the destination path from our own page content and avoid trusting any passed query params
|
|
// selector - CSS selector of the element to get screenshot of
|
|
const selector = decodeURIComponent(
|
|
await page.$eval(
|
|
"head > meta[name='omnivore:preview_image_selector']",
|
|
element => element.content,
|
|
),
|
|
);
|
|
if (!selector) {
|
|
logRecord.selectorIsInvalid = true;
|
|
console.error(`Valid element selector is not specified`, logRecord);
|
|
await page.close();
|
|
return res.sendStatus(400);
|
|
}
|
|
logRecord.selector = selector;
|
|
|
|
// destination - destination pathname for the image to save with
|
|
const destination = decodeURIComponent(
|
|
await page.$eval(
|
|
"head > meta[name='omnivore:preview_image_destination']",
|
|
element => element.content,
|
|
),
|
|
);
|
|
if (!destination) {
|
|
logRecord.destinationIsInvalid = true;
|
|
console.error(`Valid file destination is not specified`, logRecord);
|
|
await page.close();
|
|
return res.sendStatus(400);
|
|
}
|
|
logRecord.destination = destination;
|
|
|
|
const screenshotTakingStart = Date.now();
|
|
try {
|
|
await page.waitForSelector(selector, { timeout: 3000 }); // wait for the selector to load
|
|
} catch (error) {
|
|
logRecord.elementNotFound = true;
|
|
console.error(`Element is not presented on the page`, logRecord);
|
|
await page.close();
|
|
return res.sendStatus(400);
|
|
}
|
|
const element = await page.$(selector);
|
|
await element.screenshot({ path: filePath }); // take screenshot of the element in puppeteer
|
|
logRecord.timing = { ...logRecord.timing, screenshotTaken: Date.now() - screenshotTakingStart };
|
|
|
|
await page.close();
|
|
|
|
try {
|
|
const [file] = await previewBucket.upload(filePath, {
|
|
destination,
|
|
metadata: logRecord,
|
|
});
|
|
logRecord.file = file.metadata;
|
|
} catch (e) {
|
|
console.log('error uploading to bucket, this is non-fatal', e)
|
|
}
|
|
|
|
console.info(`preview-image`, logRecord);
|
|
return res.redirect(`${process.env.PREVIEW_IMAGE_CDN_ORIGIN}/${destination}`);
|
|
}
|
|
|
|
const DOM_PURIFY_CONFIG = {
|
|
ADD_TAGS: ['iframe'],
|
|
ADD_ATTR: ['allow', 'allowfullscreen', 'frameborder', 'scrolling'],
|
|
FORBID_ATTR: [
|
|
'data-ml-dynamic',
|
|
'data-ml-dynamic-type',
|
|
'data-orig-url',
|
|
'data-ml-id',
|
|
'data-ml',
|
|
'data-xid',
|
|
'data-feature',
|
|
],
|
|
}
|
|
|
|
function domPurifySanitizeHook(node, data) {
|
|
if (data.tagName === 'iframe') {
|
|
const urlRegex = /^(https?:)?\/\/www\.youtube(-nocookie)?\.com\/embed\//i
|
|
const src = node.getAttribute('src') || ''
|
|
const dataSrc = node.getAttribute('data-src') || ''
|
|
|
|
if (src && urlRegex.test(src)) {
|
|
return
|
|
}
|
|
|
|
if (dataSrc && urlRegex.test(dataSrc)) {
|
|
node.setAttribute('src', dataSrc)
|
|
return
|
|
}
|
|
|
|
node.parentNode?.removeChild(node)
|
|
}
|
|
}
|
|
|
|
function getPurifiedContent(html) {
|
|
const newWindow = parseHTML('')
|
|
const DOMPurify = createDOMPurify(newWindow)
|
|
DOMPurify.addHook('uponSanitizeElement', domPurifySanitizeHook)
|
|
const clean = DOMPurify.sanitize(html, DOM_PURIFY_CONFIG)
|
|
return parseHTML(clean).document
|
|
}
|
|
|
|
function signImageProxyUrl(url) {
|
|
return encode(
|
|
crypto.createHmac('sha256', process.env.IMAGE_PROXY_SECRET).update(url).digest()
|
|
)
|
|
}
|
|
|
|
function createImageProxyUrl(url, width = 0, height = 0) {
|
|
if (!process.env.IMAGE_PROXY_URL || !process.env.IMAGE_PROXY_SECRET) {
|
|
return url
|
|
}
|
|
|
|
const urlWithOptions = `${url}#${width}x${height}`
|
|
const signature = signImageProxyUrl(urlWithOptions)
|
|
|
|
return `${process.env.IMAGE_PROXY_URL}/${width}x${height},s${signature}/${url}`
|
|
}
|
|
|
|
async function getReadabilityResult(url, document) {
|
|
// First attempt to read the article as is.
|
|
// if that fails attempt to purify then read
|
|
const sources = [
|
|
() => {
|
|
return document
|
|
},
|
|
() => {
|
|
return getPurifiedContent(document)
|
|
},
|
|
]
|
|
|
|
for (const source of sources) {
|
|
const document = source()
|
|
if (!document) {
|
|
continue
|
|
}
|
|
|
|
try {
|
|
const article = await new Readability(document, {
|
|
createImageProxyUrl,
|
|
url,
|
|
}).parse()
|
|
|
|
if (article) {
|
|
return article
|
|
}
|
|
} catch (error) {
|
|
console.log('parsing error for url', url, error)
|
|
}
|
|
}
|
|
|
|
return null
|
|
}
|
|
|
|
module.exports = {
|
|
fetchContent,
|
|
preview,
|
|
};
|
|
|