ldr-reload-image-without-referer.user.js

ldr-reload-image-without-referer.user.js

// ==UserScript==
// @name         ldr-reload-image-without-referer
// @include      http://reader.livedoor.com/reader/
// @include      http://fastladder.com/reader/
// ==/UserScript==

(function() {
  function initPool() {
    var origin = location.protocol + '//' + location.host;
    var html = document.implementation.createHTMLDocument('');
    var iframe = document.createElement('iframe');
    var script = document.createElement('script');

    script.type = 'text/javascript';
    script.textContent = '(' + (function(origin) {
      var channel = new MessageChannel();
      var port = channel.port1;

      window.parent.postMessage('', [channel.port2], origin);

      port.onmessage = function(e) {
        var img = document.createElement('img');
        var uri = e.data.uri;
        var key = uri.indexOf('?') > -1 ? '&' : '?';

        img.src = uri + key;
        img.onload = function(e) {
          port.postMessage({ loaded: true, uri: uri, key: key });
          e.target.parentNode.removeChild(e.target);
        };
        img.onerror = function(e) {
          port.postMessage({ loaded: false, uri: uri });
          e.target.parentNode.removeChild(e.target);
        };

        document.body.appendChild(img);
      };
    }).toString() + ')(' + JSON.stringify(origin) + ')';

    html.body.appendChild(script);

    iframe.src = 'data:text/html,' + html.documentElement.outerHTML;
    iframe.style.visibility = 'hidden';
    iframe.width = 0;
    iframe.height = 0;

    document.body.appendChild(iframe);
  }

  function message(str) {
    document.getElementById('message').textContent = str;
  }

  var loading = {};

  window.addEventListener('message', function(e) {
    if (e.origin !== 'null' || !e.ports[0])
      return;

    var port = e.ports[0];

    document.body.addEventListener('error', function(e) {
      if (e.target.tagName.toUpperCase() === 'IMG') {
        if (e.target.src in loading) {
          loading[e.target.src].push(e.target);
        } else {
          loading[e.target.src] = [e.target];
          port.postMessage({ uri: e.target.src });
        }
      }
    }, true);

    port.onmessage = function(e) {
      if (e.data.uri in loading) {
        if (e.data.loaded) {
          loading[e.data.uri].forEach(function(img) {
            if (img)
              img.src = e.data.uri + e.data.key;
          });
        } else {
          message('Error: ' + e.target.src);
        }
        delete loading[e.data.uri];
      }
    };

    window.removeEventListener('message', arguments.callee, false);
  }, false);

  document.addEventListener('click', function(e) {
    if (e.target.tagName.toUpperCase() === 'A')
      e.target.rel = 'noreferrer';
    else if (e.target.parentNode.tagName.toUpperCase() === 'A')
      e.target.parentNode.rel = 'noreferrer';
  }, false);

  initPool();
})();