Function fetchMeta

coursescan.js:18–66

(cidd)

}

async function fetchMeta(cidd) {
  //default metadata values
  const meta = {
    'url': ciddToURL(cidd),
    'cid': cidd['cid'],
    'proper name': '',
    'thumbnail': '',  
    'url name': cidd['cid'],
    'number of levels': '??',
    'number of items': '??',
    'description': '',
    'author': '',
    'ava': 'https://static.memrise.com/accounts/img/placeholders/empty-avatar-2.png', // -> rnd 1..4
  };

  let course_page;
  try {
    course_page = await fetch(ciddToURL(cidd));
  } catch(err) {
    console.error(`failed to fetch course ${cidd['cid']} html`, err);
  }
  if (!course_page) return meta;

  meta['url name'] = course_page.url.split("/")[6]; // course name from the end of url after redirections

  try {
    const parser =  new DOMParser();
    const doc = parser.parseFromString(await course_page.text(), "text/html");

    meta['proper name'] = doc.querySelector('.course-name').innerText;
    meta['thumbnail'] = doc.querySelector('.course-photo img').src;
    meta['number of levels'] = (query => (query ? query.childElementCount : 1))(doc.querySelector('div.levels'));
    meta['description'] = (desc => (desc ? desc.innerText : ""))(doc.querySelector('.course-description.text'));
    meta['author'] = doc.querySelector('.creator-name span').innerText;
    meta['ava'] = doc.querySelector('.creator-image img').src;
    try {
      //only works for courses that have been started, otherwise the info is not present on the page
      meta['number of items'] = parseInt(doc.querySelector('.progress-box-title').innerText.split('/').at(-1).trim(), 10).toString();
    } catch(err) {
      console.log(`course ${cidd['cid']} has not been started, info for 'number of items' unavailable`);
    }
  } catch(err) {
    console.error(`failed to parse course ${cidd['cid']} html`, err);    
  }

	console.log(meta);

  return meta;
}

function meta2txt(meta) {
	let text = 'data:md/plain;charset=utf-8,' + encodeURIComponent(