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perillamint / unlink.is

// ==UserScript==
// @name        unlink.is
// @namespace   http://gmscript.gentoo.moe
// @include     https://twitter.com/*
// @include     https://tweetdeck.twitter.com/*
// @exclude     https://twitter.com/i/*
// @version     0.4
// @require     https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js
// @downloadURL https://raw.githubusercontent.com/perillamint/unlink.is/master/unlinkis.js
// @updateURL   https://raw.githubusercontent.com/perillamint/unlink.is/master/unlinkis.meta.js
// @grant       GM_xmlhttpRequest
// @license     MPL-2.0 or later
// @connect     t.co
// @connect     ln.is
// @connect     linkis.com
// ==/UserScript==

//Caution: This parsing method is not code-change resist.
var jsblock_regex = /<script[^>]*>[\s\S]([.\s\S]*?)<\/script>/g;
var urlgrabber_regex = /longUrl"?:[ ]*"(.+?)"/;
var linkdata_obj_regex = /var LinkData/;

var linkis_detect = /(?:ln\.is|linkis\.com)\/\w+/;
var linkis_card_detect = /(?:ln\.is|linkis\.com)/;
var card_iframe_regex = /xdm_default\d+?_provider/;

//Caution: This url extractor WILL CRASH when twitter changes working method of t.co
var tco_url_extract_regex = /location\.replace\("(.*?)"\)/;
var tco_url_detect = /http(|s):\/\/t.co\/[^\/]*$/;

var tweetdeck = location.hostname === 'tweetdeck.twitter.com';

function get_jsblock(str) {
  var match = str.match(jsblock_regex);
  var ret = [];
  for (var i = 1; i < match.length; i++) {
    ret[i - 1] = match[i];
  }
  return ret;
}

function extract_url(str) {
  if (str.match(linkdata_obj_regex) !== null) {
    var match = str.match(urlgrabber_regex);
    if (match !== null) {
      return match[1].replace(/\\\//g, '/');
    }
  }
  return null;
}

function convert_and_patch(url, jqobj, depth) {
  if (depth > 100) return;

  console.log('Resolving url: ' + url);

  GM_xmlhttpRequest({
    method: 'GET',
    url: url,
    onload: function(resp) {
      //Check xmlhttpRequest ends with t.co
      if (resp.finalUrl.match(tco_url_detect) !== null) {
        var url_arr = resp.response.match(tco_url_extract_regex);
        if (url_arr === null) return;

        convert_and_patch(url_arr[1].replace(/\\\//g, '/'), jqobj, depth + 1);
      }
      var jsblock_arr = get_jsblock(resp.response);
      var url = null;
      for (var i = 0; i < jsblock_arr.length; i++) {
        url = extract_url(jsblock_arr[i]);
        if (url !== null) break;
      }
      jqobj.attr('href', url);
      // Check `jqobj` is normal link or tweet card
      if (jqobj.hasClass('twitter-timeline-link') || jqobj.hasClass('url-ext')) {
        jqobj.text(url).attr('title', url);
      } else if (jqobj.hasClass('TwitterCard-container')) {
        jqobj.find('span.SummaryCard-destination').text(jqobj[0].hostname);
      }
    },
    onerror: function(err) {
      console.log(err);
    }
  });
}

function tweet_handler(elem) {
  if (elem.tagName == 'IFRAME' && card_iframe_regex.test(elem.id)) {
    $(elem).on('load', function (event) {
      var card_hostname = elem.contentWindow.document.querySelector('span.SummaryCard-destination');
      if (card_hostname !== null && linkis_card_detect.test(card_hostname.textContent)) {
        var link = elem.contentWindow.document.querySelector('a.js-openLink');
        convert_and_patch(link.href, $(link), 0);
      }
    });
  } else {
    if (tweetdeck) {
      var links = $(elem).find('a.url-ext');
    } else {
      var links = $(elem).find('a.twitter-timeline-link');
    }
    for (var i = 0; i < links.length; i++) {
      var match = $(links[i]).text().match(linkis_detect);

      if (match !== null) {
        convert_and_patch(links[i].href, $(links[i]), 0);
      }
    }
  }
}

function get_tweets() {
  $('.tweet').each(function(i, tweet) {
    tweet_handler(tweet);
  });
}

var obs_config = {
  childList: true,
  characterData: true,
  subtree: true
};

var observer = new MutationObserver(function(mutations) {
  mutations.forEach(function(mutation) {
    var added_nodes = mutation.addedNodes;
    for (var i = 0; i < added_nodes.length; i++) {
      tweet_handler(added_nodes[i]);
    }
  });
});

observer.observe(document.body, obs_config);
get_tweets();

console.log('Unlink.is ready!');