akitten/linkedin-canonical-url

"use strict";

/**
* @function transform
* @description tranform converts a long/international LinkedIn Url to its unique form
* example original (international) url: https://sy.linkedin.com/pub/krzysztof-marzec/a7/576/b50?trk=biz_employee_pub
* is transformed to: https://www.linkedin.com/in/krzysztof-marzec-b50576a7
*
* @param {String} url - the url you want to transform.
* @returns {String} url - the canonical url
*
*/
function transform (url) {

  let id, parts, pos;

  url = url.toLowerCase();
  pos = url.indexOf('linkedin');
  url = url.substring(pos, url.length); // strip everything before linkedin
  url = url.split('?')[0];              // remove any query parameters
  parts = url.split('/');               // split url into parts

  if (url.lastIndexOf('/') === url.length - 1) { // strip trailing slash from url
    url = url.substring(0, url.length-1);
  }
  if (parts.length === 4 && parts[3].length === 2) { //shortcut for language
    url = parts[0].toLowerCase() + '/' +  parts[1] + '/' + parts[2];
  }
  else if (parts.length > 3 && parts[4] !== undefined ) {

    // urls with ids have more parts
    if(parts[4].length === 2) {
      parts[4] = '0' + parts[4];        // see: http://git.io/vRBcL
    }

    if(parts[5].length === 2) {
      parts[5] = '0' + parts[5];        // see: http://git.io/vRBcL
    }

    if(parts[5].length === 1) {
      parts[5] = '00' + parts[5];        // see: http://git.io/vRBcL
    }

    id = parts[5] + parts[4] + parts[3]; // see example above
    url = parts[0] + '/' +  parts[1] + '/' + parts[2] + '-' + id;
  }

  return 'https://www.' + url.replace('pub', 'in'); // pub are for Search Engines

}

module.exports = transform;