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moped / GearBest copy short url button

// ==UserScript==
// @name         GearBest copy short url button
// @namespace    https://openuserjs.org/users/moped
// @license      GPL-3.0-or-later; http://www.gnu.org/licenses/gpl-3.0.txt
// @version      1.1.0
// @description  Adds a copy short url button to GearBest item page. Copies a nice link instead of a long one.
// @author       moped
// @copyright    Apr 23, 2019, moped
// @include      *://www.gearbest.com/*.html*
// @run-at       document-end
// @icon         https://css.gbtcdn.com/imagecache/gbw/img/new-ico/apple-touch-icon-ipad3-144@.png
// @grant        GM_addStyle
// @grant        GM_setClipboard
// ==/UserScript==

'use strict';

// icon: https://visualpharm.com/free-icons/link-595b40b85ba036ed117dd80a
var copyButton = '<a rel="nofollow" href="javascript: void(0);" ' +
				'id="copy-url" aria-label="Copy short url to clipboard" ' +
				'title="Copy short url to clipboard">' +
				'<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50" height="20px" width="20px"><path d="M24.6,29.6c0.9,2.5,0.3,5.3-1.6,7.3l-6,6c-1.3,1.3-3.1,2-4.9,2c-1.9,0-3.6-0.7-4.9-2c-2.7-2.7-2.7-7.2,0-9.9l6-6 c1.3-1.3,3.1-2,4.9-2c0.8,0,1.6,0.1,2.3,0.4l1.5-1.5C20.7,23.3,19.3,23,18,23c-2.3,0-4.6,0.9-6.4,2.6l-6,6c-3.5,3.5-3.5,9.2,0,12.7 C7.4,46.1,9.7,47,12,47s4.6-0.9,6.4-2.6l6-6c2.8-2.8,3.3-6.9,1.7-10.2L24.6,29.6z M44.4,5.6C42.6,3.9,40.3,3,38,3s-4.6,0.9-6.4,2.6 l-6,6c-2.8,2.8-3.3,6.9-1.7,10.2l1.5-1.5C24.5,17.8,25.1,15,27,13l6-6c1.3-1.3,3.1-2,4.9-2c1.9,0,3.6,0.7,4.9,2 c2.7,2.7,2.7,7.2,0,9.9l-6,6c-1.3,1.3-3.1,2-4.9,2c-0.8,0-1.6-0.1-2.3-0.4L28.1,26c1.2,0.6,2.5,0.9,3.9,0.9c2.3,0,4.6-0.9,6.4-2.6 l6-6C47.9,14.9,47.9,9.1,44.4,5.6z M32.1,17.9c-0.2-0.2-0.4-0.3-0.7-0.3c-0.2,0-0.5,0.1-0.7,0.3L18,30.6c-0.4,0.4-0.4,1,0,1.4 c0.2,0.2,0.5,0.3,0.7,0.3s0.5-0.1,0.7-0.3l12.7-12.7C32.5,18.9,32.5,18.3,32.1,17.9z"/></svg>' +
				'&nbsp Copy URL</a>';

function tryShortUrl() {
    var canonical = document.querySelector("link[rel='canonical']");
    if( canonical !== null )
        return canonical.href;

	var url = document.URL;
	url = url.replace(/.*(pp_[0-9_]+\.html).*(\?wid=[0-9]+).*/, "$1$2");

	return 'https://www.gearbest.com/' + url;
}

GM_addStyle('\
#copy-url { color: #000; transition: color .35s ease-in-out; margin-left: 2em; }\
#copy-url > svg { transition: fill .25s ease-in-out; vertical-align: bottom; }\
.copy-ok { color: #99cc00!important; }\
.copy-ok > svg { fill: #99cc00!important; }\
');

document.querySelector('.goodsIntro_collect').insertAdjacentHTML('beforeend', copyButton);

document.querySelector('#copy-url').addEventListener('click', function(event) {
	GM_setClipboard(tryShortUrl(), 'text');
	this.classList.add("copy-ok");
	event.preventDefault();
});