freeplanet_serverside/src/server/modules/Scraping.js

import axios from 'axios';
import cheerio from 'cheerio';

class AmazonBookScraper {
  constructor() {
    this.baseUrl = 'https://www.amazon.it/dp/';
  }

  async fetchPage(isbn) {
    const url = `${this.baseUrl}${isbn}`;
    try {
      const { data } = await axios.get(url, {
        headers: {
          'User-Agent':
            'Mozilla/5.0 (Windows NT 10.0; Win64; x64) ' +
            'AppleWebKit/537.36 (KHTML, like Gecko) ' +
            'Chrome/113.0.0.0 Safari/537.36',
          // altri header se necessario
        },
      });
      return data;
    } catch (err) {
      console.error(`Errore fetching ISBN ${isbn}:`, err.message);
      return null;
    }
  }

  extractData(html) {
    const $ = cheerio.load(html);

    // Titolo
    let title = $('#productTitle').text().trim() || null;

    // Sottotitolo (Amazon spesso lo mette in #productSubtitle o nel titolo, proveremo)
    let subtitle = $('#productSubtitle').text().trim() || null;

    // Numero pagine, formato, edizione
    // Questi dati spesso sono nella tabella dettagli prodotto con id #detailBullets_feature_div o #productDetailsTable
    // Proviamo a estrarre da #detailBullets_feature_div

    let pages = null;
    let format = null;
    let edition = null;

    $('#detailBullets_feature_div li').each((i, el) => {
      const label = $(el).find('span.a-text-bold').text().trim().toLowerCase();
      const value = $(el).find('span').last().text().trim();

      if (label.includes('pagine') || label.includes('pagine stampate')) {
        pages = value;
      } else if (label.includes('formato')) {
        format = value;
      } else if (label.includes('edizione')) {
        edition = value;
      }
    });

    // fallback su #productDetailsTable (altro possibile layout)
    if (!pages || !format || !edition) {
      $('#productDetailsTable .content tr').each((i, el) => {
        const label = $(el).find('th').text().trim().toLowerCase();
        const value = $(el).find('td').text().trim();

        if (!pages && (label.includes('pagine') || label.includes('pagine stampate'))) {
          pages = value;
        } else if (!format && label.includes('formato')) {
          format = value;
        } else if (!edition && label.includes('edizione')) {
          edition = value;
        }
      });
    }

    return { title, subtitle, pages, format, edition };
  }

  async scrapeISBN(isbn) {
    const html = await this.fetchPage(isbn);
    if (!html) return null;

    const data = this.extractData(html);
    return data;
  }

  async scrapeMultiple(isbnList) {
    const results = [];
    for (const isbn of isbnList) {
      console.log(`Scraping ISBN: ${isbn}`);
      const data = await this.scrapeISBN(isbn);
      results.push({ isbn, ...data });
      // Per evitare blocchi, metti una pausa (es. 2 secondi)
      await new Promise((r) => setTimeout(r, 2000));
    }
    return results;
  }
}

export async function ScraperDataAmazon(idapp, options) {
  const scraper = new AmazonBookScraper();
  const isbn = options.isbn;

  try {
    const data = await scraper.scrapeISBN(isbn);
    console.log(data);
    return data;
  } catch (e) {
    console.error(e);
    return res.status(400).send({ code: server_constants.RIS_CODE_ERR, msg: '' });
  }
}

export async function ScraperMultipleDataAmazon(idapp, options) {
  const scraper = new AmazonBookScraper();
  const isbnList = ['8850224248']; // metti i tuoi ISBN qui

  try {
    const books = await scraper.scrapeMultiple(isbnList);
    console.log(books);
  } catch (e) {
    console.error(e);
    return res.status(400).send({ code: server_constants.RIS_CODE_ERR, msg: '' });
  }
}

export default AmazonBookScraper;