headless.js

import puppeteer from 'puppeteer';
import tough from 'tough-cookie';
import iconv from 'iconv-lite';
import {load} from 'cheerio';
import path from 'path';
import fs from 'fs-extra';
import dotenv from 'dotenv';
import { execSync } from 'child_process';
import {join} from 'path';
import {jar, chineseToUnicode, downloadFile, gb2312UrlEncode, get, post, parseCookies, reset_cookie_jar} from './utils.js';

dotenv.config();

const host = 'https://mmis.hkpl.gov.hk'
async function get_list(page) {
  const url = `${host}/search-result?p_p_id=search_WAR_mmisportalportlet&p_p_lifecycle=0&p_p_state=normal&_search_WAR_mmisportalportlet_keywords=%E5%A4%A7%E5%85%AC%E5%A0%B1&_search_WAR_mmisportalportlet_hsf=%E5%A4%A7%E5%85%AC%E5%A0%B1&p_r_p_-1078056564_actual_q=%28%20all_dc.title%3A%28%22%E5%A4%A7%E5%85%AC%E5%A0%B1%22%29%29%20AND+%28%20verbatim_dc.collection%3A%28%22Old%5C%20HK%5C%20Newspapers%22%29%29&p_r_p_-1078056564_sort_field=dc.publicationdate_bsort&_search_WAR_mmisportalportlet_mode=Advanced&p_r_p_-1078056564_curr_page=${page}&_search_WAR_mmisportalportlet__advancedsearch_WAR_mmisportalportlet_formDate=1389840730864&p_r_p_-1078056564_new_search=false&p_r_p_-1078056564_sort_order=desc&_search_WAR_mmisportalportlet_jspPage=%2Fjsp%2Fsearch%2Fcnsc05.jsp`;
  let html = "";
  const dir = `./html/list`;
  const f = join(dir, page + ".html");
  if (
    await fs.exists(f) &&
    (await fs
      .readFile(f))
      .toString()
      .indexOf("The system is busy. Please retry later") != -1
  ) {
    await fs.unlink(f);
  }
  if (await fs.exists(f)) {
    console.log("exists", f);
    html = (await fs.readFile(f)).toString();
  } else {
    while (true) {
      const { data } = await get(url);
      if (data.indexOf("The system is busy. Please retry later") != -1) {
        continue;
      }
      html = data;
      const a = html.indexOf("<body");
      const b = html.indexOf("</body>");
      html = html.substring(a, b) + "</body>";
      const links = load(html)(".result-title a");
      await fs.ensureDir(dir);
      if (!links.length) {
        return [];
      }
      await fs.writeFile(f, html);
      break;
    }
  }

  const links = load(html)(".result-title a");
  const res = [];
  for (const link of links) {
    res.push({
      href: link.attribs.href,
      text: link.children[0].data,
    });
  }
  return res;
}

async function crawl_by_page(page) {
  const links = await get_list(page);
  for (const link of links) {
    const date_str = link.text.split(" ")[1];
    let [year, month, day] = date_str.split("-");
    month = parseInt(month);
    day = parseInt(day);
    year = parseInt(year);
    const dir = join(`./html/newspaper/${year}/${month}/${day}`);
    const f = join(dir, "index.html");
    let detail_html = "";
    if ((await fs.exists(f)) && (await fs.readFile(f)).toString().indexOf('The system is busy. Please retry later') != -1) {
      await fs.unlink(f);
    }
    if (await fs.exists(f)) {
      console.log("exists", f);
      detail_html = (await fs.readFile(f)).toString();
    } else {
      await fs.ensureDir(dir);
      while (true) {
        const { data: html } = await get(`${host}${link.href}`);
        if (html.indexOf("The system is busy. Please retry later") != -1) continue;
        await fs.writeFile(f, html);
        detail_html = html;
        break;
      }
    }

    const key = 'htmlURL="';
    const pivot = detail_html.indexOf(key);
    const viewer_url = `${host}${detail_html.substring(
      pivot + key.length,
      detail_html.indexOf('"', pivot + key.length)
    )}`;
    const key2 = "initPageLinks(null,";
    const pivot2 = detail_html.indexOf(key2);
    const total_page = parseInt(
      detail_html.substring(
        pivot2 + key2.length,
        detail_html.indexOf(",", pivot2 + key2.length)
      )
    );

    const search_params = new URLSearchParams("?" + viewer_url.split("?")[1]);

    const month_pad_start = month.toString().padStart(2, "0");
    const day_pad_start = day.toString().padStart(2, "0");
    for (let i = 1; i <= total_page; ++i) {
      // console.log("download img", year, month, day, i, "/", total_page);
      const img_path = join(dir, i + ".png");
      if (await fs.exists(img_path)) {
        if ((await fs.readFile(img_path)).toString().indexOf('The system is busy. Please retry later') != -1) {
          await fs.unlink(img_path);
        } else {
          // console.log("skip");
          continue;
        }
      }

      // const encToken = search_params.get("encToken");
      const encToken =
      '...';
      const img_url =
        `https://mmis.hkpl.gov.hk/ebook/viewer?resource=page` +
        `&item=${search_params.get("item")}` +
        `&type=` +
        `&ref=%2FMULTI_IMAGE_INDEX%2F${
          month_pad_start + day_pad_start
        }%2FNPTKP${
          year.toString() + month_pad_start + day_pad_start
        }%2Fimage%2FNPTKP${
          year.toString() + month_pad_start + day_pad_start
        }_${i.toString().padStart(2, "0")}.png` +
        `&encToken=${encodeURIComponent(encToken)}`;
      // console.log(img_url);
      await downloadFile(img_url, img_path, Infinity);
    }
    // const {data: viewer_html} = await get(viewer_url);
    // console.log(viewer_html);
    // return;
  }
}


(async () => {
  const pages = Math.floor(16865 / 10);
  const arr = (new Array(pages)).fill(0).map((_, i) => i+1);//.sort(() => Math.random() > 0.5 ? 1 : -1);
  /*
  for (let i = 1; i <= pages; ++i) {
    // console.log(i + "/" + pages);
    crawl_by_page(i);
  }
  */
  await Promise.all[
    new Array(10).fill(0).map(async (i) => {
      while (arr.length) {
        console.log(arr.length);
        await crawl_by_page(arr.pop());
      }
    })
  ];
})();