jarviscrawlercore/plugins/exportarticle/zhihu.answer.js

jarvis crawler core

const {mgrPlugins} = require('./pluginsmgr');
const log = require('../../src/log');

/**
 * ismine
 * @param {string} url - URL
 * @return {bool} ismine
 */
function ismine(url) {
  if (url.indexOf('https://www.zhihu.com/question/') == 0) {
    return true;
  }

  return false;
}

/**
 * getQuestion
 * @param {object} page - page
 * @return {object} result - {question, text}
 */
async function getQuestion(page) {
  let errret = undefined;
  const ret = await page
      .evaluate(async () => {
        const ret = {};

        const qt = getElement('.QuestionHeader-title');
        if (qt) {
          ret.question = qt.innerText;
        }

        return ret;
      })
      .catch((err) => {
        log.error('zhihu.answer:getQuestion.evaluate', err);

        errret = err;
      });

  return {
    result: ret,
    err: errret,
  };
}

/**
 * exportArticle
 * @param {object} page - page
 * @return {ExportArticleResult} result - result
 */
async function exportArticle(page) {
  const q = await getQuestion(page);

  const dom = await page.$eval('.Card.AnswerCard', (element) => {
    return element.innerHTML;
  });

  await page.setContent(dom);

  let errret = undefined;
  const ret = await page
      .evaluate(async (question) => {
        const ret = {};
        ret.imgs = [];
        ret.paragraphs = [];

        window.waitimgs = 0;

        const objbody = getElement('body');
        if (objbody) {
          const objhead = document.createElement('div');
          objhead.className = 'article-head';

          objbody.appendChild(objhead);

          const objarticlebody = document.createElement('div');
          objarticlebody.className = 'article-body';

          objbody.appendChild(objarticlebody);

          const objtitle = document.createElement('h1');
          objtitle.innerText = question.question;
          objhead.appendChild(objtitle);

          ret.title = objtitle.innerText;

          const author = getElement('.AuthorInfo-head');
          if (author) {
            const objauthor = document.createElement('div');
            objauthor.className = 'article-author';
            objauthor.innerText = author.innerText;
            objhead.appendChild(objauthor);

            ret.author = objauthor.innerText;
          }

          const articletime = getElement('.ContentItem-time');
          if (articletime) {
            const objarticletime = document.createElement('div');
            objarticletime.className = 'article-time';

            const varreg = new RegExp(
                '([1-9]\\d{3}-(0[1-9]|1[0-2])-' + '(0[1-9]|[1-2][0-9]|3[0-1]))',
                'ig'
            );

            curtime = varreg.exec(articletime.innerText)[0];

            objarticletime.innerText = curtime; // articletime.innerText;
            objhead.appendChild(objarticletime);

            ret.writeTime = objarticletime.innerText;
          }

          const articlenode = getElement(
              '.RichText.ztext.CopyrightRichText-richText'
          );
          if (articlenode) {
          // if (articlenode.children.length > 1) {
          //   articlenode = articlenode.children[1];
          // }

            for (let i = 0; i < articlenode.children.length; ++i) {
              if (
                articlenode.children[i].tagName != 'P' &&
              articlenode.children[i].tagName != 'H2' &&
              articlenode.children[i].tagName != 'FIGURE'
              ) {
                continue;
              }

              if (articlenode.children[i].tagName == 'FIGURE') {
                let curimgs = articlenode.children[i].getElementsByTagName('div');
                if (curimgs.length > 0) {
                  ret.imgs.push(await fetchImage(curimgs[0].dataset['src']));
                  ret.paragraphs.push({pt: 2, imgURL: curimgs[0].src});

                  const curnode = document.createElement('p');
                  curnode.style.cssText = 'text-align: center;';

                  const curimg = document.createElement('img');
                  curimg.onload = () => {
                    ret.imgs[ret.imgs.length - 1].width = curimg.width;
                    ret.imgs[ret.imgs.length - 1].height = curimg.height;

                    if (window.waitimgs > 0) {
                      --window.waitimgs;
                    }
                  };

                  curimg.src = curimgs[0].dataset['src'];
                  ++window.waitimgs;

                  curnode.appendChild(curimg);

                  objarticlebody.appendChild(curnode);

                  continue;
                }

                curimgs = articlenode.children[i].getElementsByTagName('img');
                if (curimgs.length > 0) {
                  ret.imgs.push(await fetchImage(curimgs[0].src));
                  ret.paragraphs.push({pt: 2, imgURL: curimgs[0].src});

                  const curnode = document.createElement('p');
                  curnode.style.cssText = 'text-align: center;';

                  const curimg = document.createElement('img');
                  curimg.onload = () => {
                    ret.imgs[ret.imgs.length - 1].width = curimg.width;
                    ret.imgs[ret.imgs.length - 1].height = curimg.height;

                    if (window.waitimgs > 0) {
                      --window.waitimgs;
                    }
                  };

                  curimg.src = curimgs[0].src;
                  ++window.waitimgs;

                  curnode.appendChild(curimg);

                  objarticlebody.appendChild(curnode);

                  continue;
                }
              } else if (articlenode.children[i].tagName == 'H2') {
                const curnode = document.createElement('h2');

                curnode.innerText = articlenode.children[i].innerText;
                // curnode.className = 'article-body-h1';

                ret.paragraphs.push({pt: 3, text: curnode.innerText});

                objarticlebody.appendChild(curnode);
              } else {
                const curnode = document.createElement('p');

                curnode.innerText = articlenode.children[i].innerText;

                ret.paragraphs.push({pt: 1, text: curnode.innerText});

                objarticlebody.appendChild(curnode);
              }
            }
          }
        }

        clearArticleElement(objbody);

        ret.article = objbody.innerText;

        return ret;
      }, q.result)
      .catch((err) => {
        log.error('zhihu.answer:exportArticle.evaluate', err);

        errret = err;
      });

  await page.waitForFunction('window.waitimgs == 0').catch((err) => {
    log.error('zhihu.answer.formatArticle', err);
  });

  return {
    result: ret,
    err: errret,
  };
}

mgrPlugins.regExportArticle('zhihu.answer.article', ismine, exportArticle);