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raingart / Google: Bypass Result Page Redirect

// ==UserScript==
// @namespace   VA_i
// @version     8.0.0.20171116
// @grant       GM.getValue
// @grant       GM.setValue
// @grant       GM_getValue
// @grant       GM_setValue
// @grant       unsafeWindow
// @include     /^https?://(?:www|encrypted|ipv[46])\.google\.[^/]+/(?:$|[#?]|search|webhp|imgres)/
// @match       https://news.google.com/*
// @match       https://cse.google.com/cse/*
// @run-at      document-start
// @name        Google: Bypass Result Page Redirect
// @name:zh-CN  Google：绕过搜索结果网页链接重定向
// @name:zh-TW  Google：繞過搜尋結果網頁鏈接重定向
// @description Avoid Google redirect for search result pages.
// @description:zh-CN 令 Google 直接链接至搜索结果网页，无须重定向。
// @description:zh-TW 令 Google 直接鏈接至搜尋結果網頁，無須重定向。
// @license     AGPL-3.0-or-later
// ==/UserScript==

var M = (typeof GM !== 'undefined') ? GM : {
  getValue: function (name, alt) {
    var value = GM_getValue(name, alt);
    return { then: function (callback) { callback(value); } };
  },
  setValue: function (name, value) {
    GM_setValue(name, value);
    return { then: function (callback) { callback(); } };
  }
};

function getOption() {
  var opt_noopen = false;
  // For example: open https://ipv4.google.com/#x-option:open-inplace
  switch (location.hash) {
    // Open links in the current tab.
    case '#x-option:open-inplace': opt_noopen = true; break;
    // Do not ...
    case '#x-option:no-open-inplace': opt_noopen = false; break;
    default: return M.getValue('opt_noopen', opt_noopen);
  }
  M.setValue('opt_noopen', opt_noopen);
  return { then: function (callback) { callback(opt_noopen); } };
}

function unsafeEval(func, opt) {
  let body = 'return (' + func + ').apply(this, arguments)';
  unsafeWindow.Function(body).call(unsafeWindow, opt);
}

getOption().then(function run(opt_noopen) {
unsafeEval(function (opt_noopen) {

var debug = false;
var count = 0;

var options = {opt_noopen: opt_noopen};
debug && console.log('Options:', options);

// web pages: url?url=
// custom search engine: url?q=
// malware: interstitial?url=
var re = /\burl\?.*?\b(?:url|q)=(https?\b[^&#]+)/i;
var restore = function (link, url) {
  var oldUrl = link.getAttribute('href') || '';
  var newUrl = url || oldUrl;
  var matches = newUrl.match(re);
  if (matches) {
    debug && console.log('restoring', link._x_id, newUrl);
    link.setAttribute('href', decodeURIComponent(matches[1]));
    enhanceLink(link);
  } else if (url != null) {
    link.setAttribute('href', newUrl);
  }
};

var purifyLink = function (a) {
  if (/\brwt\(/.test(a.getAttribute('onmousedown'))) {
    a.removeAttribute('onmousedown');
  }
  if (a.parentElement &&
      /\bclick\b/.test(a.parentElement.getAttribute('jsaction') || '')) {
    a.addEventListener('click', function (e) {
      e.stopImmediatePropagation();
      e.stopPropagation();
    }, true);
  }
};

var enhanceLink = function (a) {
  purifyLink(a);
  a.setAttribute('rel', 'noreferrer');
  a.setAttribute('referrerpolicy', 'no-referrer');
  if (options.opt_noopen) {
    a.setAttribute('target', '_self');
    a.addEventListener('click', function (event) {
      event.stopImmediatePropagation();
      event.stopPropagation();
    }, true);
  }
};

var fakeLink = document.createElement('a');
var normalizeUrl = function (url) {
  fakeLink.href = url;
  return fakeLink.href;
};

var setter = function (v) {
  v = String(v);  // in case an object is passed by clever Google
  debug && console.log('State:', document.readyState);
  debug && console.log('set', this._x_id, this.getAttribute('href'), v);
  restore(this, v);
};
var getter = function () {
  debug && console.log('get', this._x_id, this.getAttribute('href'));
  return normalizeUrl(this.getAttribute('href'));
};
var blocker = function (event) {
  event.stopPropagation();
  restore(this);
  debug && console.log('block', this._x_id, this.getAttribute('href'));
};

var handler = function (a) {
  if (a._x_id) {
    restore(a);
    return;
  }
  a._x_id = ++count;
  debug && a.setAttribute('x-id', a._x_id);
  if (Object.defineProperty) {
    debug && console.log('define property', a._x_id);
    Object.defineProperty(a, 'href', {get: getter, set: setter});
  } else if (a.__defineSetter__) {
    debug && console.log('define getter', a._x_id);
    a.__defineSetter__('href', setter);
    a.__defineGetter__('href', getter);
  } else {
    debug && console.log('define listener', a._x_id);
    a.onmouseenter = a.onmousemove = a.onmouseup = a.onmousedown =
      a.ondbclick = a.onclick = a.oncontextmenu = blocker;
  }
  if (/^_(?:blank|self)$/.test(a.getAttribute('target')) ||
      /\brwt\(/.test(a.getAttribute('onmousedown')) ||
      /\bmouse/.test(a.getAttribute('jsaction')) ||
      /\bclick\b/.test(a.parentElement.getAttribute('jsaction'))) {
    enhanceLink(a);
  }
  restore(a);
};

var checkNewNodes = function (mutations) {
  debug && console.log('State:', document.readyState);
  if (mutations.target) {
    checkAttribute(mutations);
  } else {
    mutations.forEach && mutations.forEach(checkAttribute);
  }
};
var checkAttribute = function (mutation) {
  var target = mutation.target;
  if (target && target.nodeName.toUpperCase() === 'A') {
    if ((mutation.attributeName || mutation.attrName) === 'href') {
      debug && console.log('restore attribute', target._x_id, target.getAttribute('href'));
    }
    handler(target);
  } else if (target instanceof Element) {
    [].slice.call(target.querySelectorAll('a')).forEach(handler);
  }
};

var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;

if (MutationObserver) {
  debug && console.log('MutationObserver: true');
  new MutationObserver(checkNewNodes).observe(document.documentElement, {
    childList: true,
    attributes: true,
    attributeFilter: ['href'],
    subtree: true
  });
} else {
  debug && console.log('MutationEvent: true');
  document.addEventListener('DOMAttrModified', checkAttribute, false);
  document.addEventListener('DOMNodeInserted', checkNewNodes, false);
}

}, opt_noopen);
});