adds magnet links to torrentz2.eu

userscript.js

// ==UserScript==
// @name         torrentz2.eu magnet links
// @author       [email protected]
// @namespace    [email protected]
// @version      0.3
// @description  adds magnet links to torrentz2.eu
// @match        *://torrentz.eu/*
// @match        *://torrentz.me/*
// @match        *://torrentz.ch/*
// @match        *://torrentz.in/*
// @match        *://torrentz2.eu/*
// @match        *://torrentz2.me/*
// @match        *://torrentz2.ch/*
// @match        *://torrentz2.in/*
// @copyright    2016+, Thedward Blevins
// ==/UserScript==

(function () {

  'use strict';

  var call    = Function.prototype.call ;
  var slice   = call.bind([].slice)     ;

  function createMagnetURI (btih,query) {
    var uri = 'magnet:?xt=urn:btih:' + btih.match(/[0-9a-f]{40}/)[0];
    var names = Object.keys(query);
    names.forEach( function (k) {
      var val = encodeURIComponent(query[k]);
      if ( k == 'kt' ) { val = val.replace('%20','+'); }
      uri += '&' + k + '=' + val;
    });
    //for (key in query) {
    //  var val = encodeURIComponent(query[key]);
    //  if ( key == 'kt' ) { val = val.replace('%20','+'); }
    //  uri += '&' + key + '=' + val;
    //};
    return uri;
  }

  function createMagnetLink (dt) {
    var a = dt.querySelector('a[href^="/"]');
    if (a) {
      var query = {};
      var btih  = a.href.match(/[0-9a-f]{40}/)[0];
      query.dn  = a.textContent;
      query.kt  = a.nextSibling.textContent
        .replace(/^\W+/,'')
        .replace(/\b(non) (fiction)\b/,'$1-$2');
      var href = createMagnetURI(btih,query);
      var link = document.createElement('a');
      link.classList.add('magnetLink');
      link.href = href;
      return link;
    } else {
      console.log(dt);
      return null;
    }
  }

  function addStyle () {
    var link  = document.createElement('link');
    link.rel  = 'stylesheet';
    link.href = '//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css';

    try {
      document.head.appendChild(link);
    } catch (e) {
      console.log('Line 64');
      console.log(e);
    }

    var sheet = (function() {
      // Create the <style> tag
      var style = document.createElement("style");

      // WebKit hack :(
      style.appendChild(document.createTextNode(""));

      // Add the <style> element to the page
      document.head.appendChild(style);

      return style.sheet;
    })();

    sheet.insertRule('i.fa-warning{color:rgb(255,0,0);}',0);
    sheet.insertRule('i.magnet-incomplete{opacity:0.5}',0);
    sheet.insertRule('a.magnetLink{padding-right: 10px;}',0);

    return sheet;
  }

  var magnetIcon = function () {
    var icon = document.createElement('i');
    icon.classList.add('fa','fa-magnet');
    return function (title) {
      return icon.cloneNode(true);
    };
  }();

  function insertMagnetLink (dt) {
    var magnet = createMagnetLink(dt);
    var icon = magnetIcon();
    try {
      magnet.appendChild(icon);
    } catch (e) {
      console.log('Line 102');
      console.log(e);
    }

    var link = dt.querySelector('a[href^="/"]');
    if ( link ) {
      dt.insertBefore(magnet,link);
    }
  }

  function addMagnetLinks (node) {
    var results = slice(node.querySelectorAll('div.results dl dt')).filter(dt => dt.querySelector('a') && ! dt.querySelector('a.magnetLink') );
    results.map( insertMagnetLink );
  }

  if ( document.querySelector('div.results') ) {
    addStyle();

    addMagnetLinks(document);

    var observer = new MutationObserver( function (mutations) {
      mutations.forEach(m => addMagnetLinks(m.target)) ; }
      );

    observer.observe(document,{childList:true,subtree:true});
  }

}());