216 lines
20 KiB
JavaScript
216 lines
20 KiB
JavaScript
import { logger } from '../index.js';
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import pMap from 'p-map';
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import { CheerioWebBaseLoader } from "langchain/document_loaders/web/cheerio";
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import { RecursiveCharacterTextSplitter } from "langchain/text_splitter";
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import { htmlToText } from "html-to-text";
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import { MappingDocumentTransformer, Document } from "@langchain/core/documents";
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import { isValidUrl } from './html.js';
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const emailRegex = /[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/g;
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const mailtoRegex = /^mailto:([^\s@]+@[^\s@]+\.[^\s@]+)$/i;
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import { PuppeteerWebBaseLoader as loader, getBrowser } from './pupeteer.js';
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export class HtmlToTextTransformer extends MappingDocumentTransformer {
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static lc_name() {
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return "HtmlToTextTransformer";
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}
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constructor(options = {}) {
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super(options);
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Object.defineProperty(this, "options", {
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enumerable: true,
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configurable: true,
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writable: true,
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value: options
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});
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}
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async _transformDocument(document) {
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const extractedContent = htmlToText(document.pageContent, this['options']);
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return new Document({
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pageContent: extractedContent,
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metadata: { ...document.metadata },
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});
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}
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}
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export const cheerioLoader = async (url) => {
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const loader = new CheerioWebBaseLoader(url);
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const docs = await loader.load();
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const splitter = RecursiveCharacterTextSplitter.fromLanguage("html");
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const transformer = new HtmlToTextTransformer();
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const sequence = splitter.pipe(transformer);
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const ret = await sequence.invoke(docs);
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return ret;
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};
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export const puppeteerLoader = async (url, headless, location, checkCancelled) => {
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if (isValidUrl(url) === false || url.indexOf('mailto') !== -1) {
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return [];
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}
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if (checkCancelled && await checkCancelled()) {
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logger.info('Cancelled before loading ' + url);
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return [];
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}
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let loaderWithOptions;
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try { // Function to detect a valid URL
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loaderWithOptions = new loader(url, {
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launchOptions: {
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headless,
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ignoreHTTPSErrors: true
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},
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gotoOptions: {
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timeout: location.pageTimeout || 15000,
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waitUntil: "networkidle0",
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},
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async evaluate(page, browser) {
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if (checkCancelled && await checkCancelled()) {
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const pid = browser.process()?.pid;
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logger.warn(`Cancellation requested inside evaluate for process ${pid}`);
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// Do not close browser, it is shared. Page will be closed by finally block in pupeteer.ts
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throw new Error('CancelledByUser');
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}
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const result = await page.evaluate(() => document.body.innerHTML);
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// await browser.close()
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return result;
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}
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});
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// Race load against cancellation
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let isFinished = false;
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const loadPromise = loaderWithOptions.load().finally(() => {
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isFinished = true;
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});
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const cancelPromise = new Promise(async (_, reject) => {
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if (!checkCancelled)
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return;
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// Poll for cancellation
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while (!isFinished) {
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await new Promise(r => setTimeout(r, 1000));
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if (await checkCancelled()) {
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const browser = await getBrowser();
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if (browser) {
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const pid = browser.process()?.pid;
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logger.info(`Cancellation confirmed for process ${pid}`);
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}
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reject(new Error('CancelledByUser'));
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break;
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}
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}
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});
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const docs = await Promise.race([loadPromise, cancelPromise]);
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const splitter = RecursiveCharacterTextSplitter.fromLanguage("html");
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const transformer = new HtmlToTextTransformer();
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const sequence = splitter.pipe(transformer);
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const ret = await sequence.invoke(docs);
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return ret;
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}
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catch (error) {
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if (error instanceof Error && error.message === 'CancelledByUser') {
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throw error;
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}
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logger.warn('Error loading page: ' + url, error instanceof Error ? error.message : String(error));
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location.rejected = true;
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// loader.browser && loader.browser.close()
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return [];
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}
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};
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const extractEmailAddresses = (text) => {
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const lines = text.split(/\r?\n/);
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const emailAddresses = [];
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const imageExtensions = ['.png', '.jpg', '.jpeg', '.gif', '.webp', '.svg', '.bmp', '.ico', '.tiff', '.avif'];
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for (const line of lines) {
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const matches = line.match(emailRegex);
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if (matches) {
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for (const match of matches) {
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// Filter out image filenames often found in srcset (e.g. image@2x.png)
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const lowerMatch = match.toLowerCase();
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const isImage = imageExtensions.some(ext => lowerMatch.endsWith(ext));
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if (!isImage) {
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emailAddresses.push(match);
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}
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}
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}
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}
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return emailAddresses;
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};
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export const findEMail = async (question, url, opts, location) => {
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// for some weird reason only the user knows :)
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if (url.match(emailRegex) || url.match(mailtoRegex) || url.indexOf('mailto') !== -1) {
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logger.warn('Email found in URL', url);
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return false;
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}
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let pageUrl = url;
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let docs = await puppeteerLoader(pageUrl, opts.headless, { ...location, pageTimeout: opts.pageTimeout }, opts.checkCancelled);
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let emails = [];
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docs.forEach((d) => {
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if (d.pageContent && d.pageContent.indexOf('@') !== -1) {
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const mails = extractEmailAddresses(d.pageContent);
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if (mails) {
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emails.push(...mails);
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}
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}
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});
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emails = [...new Set(emails)];
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location.emails = emails;
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if (emails.length) {
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location.email = emails[0];
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}
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location.email && logger.debug(`Found email for ${url} / ${location.title} : ${location.type} : ${location.email} : ${opts.searchFrom}`);
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return emails;
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};
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export const findEmailEach = async (location, opts, onProgress) => {
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if (!location.meta || !location.meta.pages) {
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return [];
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}
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const emails = [];
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const abortAfter = opts.abortAfter ?? 1;
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const concurrency = opts.concurrency || 2;
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const maxPages = opts.maxPages || 15;
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const contactKeywords = ['contact', 'kontakt', 'contacto', 'contatto', 'info', 'imprint', 'impressum', 'help', 'support', 'about'];
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// Sort pages: prioritize contact pages
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const pagesToSearch = location.meta.pages.sort((a, b) => {
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const urlA = a.url.toLowerCase();
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const urlB = b.url.toLowerCase();
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const scoreA = contactKeywords.some(k => urlA.includes(k)) ? 1 : 0;
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const scoreB = contactKeywords.some(k => urlB.includes(k)) ? 1 : 0;
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return scoreB - scoreA; // Descending order (contact pages first)
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}).slice(0, maxPages);
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await pMap(pagesToSearch, async (page) => {
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logger.debug(`[findEmailEach] Processing page: ${page.url}`);
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if (opts.checkCancelled && await opts.checkCancelled()) {
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logger.info(`[findEmailEach] Cancellation requested for ${location.title}`);
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return;
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}
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if (emails.length >= abortAfter) {
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return;
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}
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if (page.status !== 'PENDING') {
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return;
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}
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page.status = 'SEARCHING_EMAIL';
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try {
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const pageEmails = await findEMail('find email', page.url, opts, location);
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if (pageEmails && Array.isArray(pageEmails)) {
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emails.push(...pageEmails);
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}
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page.status = 'SEARCHED_EMAIL';
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logger.debug(`[findEmailEach] Finished page: ${page.url}`);
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}
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catch (error) {
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if (error.message === 'CancelledByUser') {
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throw error;
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}
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page.status = 'FAILED';
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page.error = error.message;
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logger.error(`Error scraping email from ${page.url}:`, error);
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}
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if (onProgress) {
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logger.info(`[findEmailEach] Progress for ${location.title}`);
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await onProgress(page);
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}
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}, { concurrency, stopOnError: false });
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// Update location emails
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if (emails.length > 0) {
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const uniqueEmails = [...new Set([...(location.emails || []), ...emails])];
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location.emails = uniqueEmails;
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if (uniqueEmails.length > 0) {
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location.email = uniqueEmails[0];
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}
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}
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return emails;
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};
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