Backlinks

A backlink for a given web resource is a link from some other website (the referrer) to that web resource (the referent).
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// ==UserScript==
// @name            Backlinks
// @name:de         Rückverweise
// @description     A backlink for a given web resource is a link from some other website (the referrer) to that web resource (the referent).
// @description:de  Ein Rückverweis oder Backlink bezeichnet einen Link, der von einer anderen Webseite ausgehend zu einer bestimmten Webseite führt.
// @version         1.0.1.5
// @author          Wack.3gp (https://greasyfork.org/users/4792)
// @copyright       2021+, Wack.3gp
// @namespace       https://greasyfork.org/users/4792
// @license         CC BY-NC-ND 4.0; http://creativecommons.org/licenses/by-nc-nd/4.0/
//
// @match           *://*/*
// @noframes
//
// @grant           GM_registerMenuCommand
// @grant           GM_notification
// @grant           GM_xmlhttpRequest
//
// @compatible      Chrome tested with Tampermonkey
// @supportURL      https://greasyfork.org/scripts/423644/feedback
// @contributionURL https://www.paypal.com/donate/?hosted_button_id=BYW9D395KJWZ2
// @contributionAmount €1.00
// ==/UserScript==

/* jshint esversion: 9 */

(function() {
    'use strict';

    const _vault = "4792";
    const _isOriginal = GM_info.script.namespace.includes(_vault);
    const _originalURL = GM_info.script.supportURL.replace("feedback", "");

    const checkProtection = () => {
        if (!_isOriginal) {
            alert("Please install the Original Version");
            window.location.href = _originalURL;
            return false;
        }
        return true;
    };

    GM_registerMenuCommand("🔎 Check Backlinks", function () {
        
        if (!checkProtection()) return;

        var website = prompt("Please enter your Website:", document.URL);
        if (website == null) {
            alert("User cancelled the prompt.");
            return;
        }
        
        if (website == "") {
            alert("Input field must not be empty.");
            return;
        }

        var urlPattern = /^(http.?:\/\/|)\w*\.*[A-Z]*(\.\w*($|\/.*|\?)|\?.*|\d*|$)($|\:\d*($|\/|\?))/gim;
        if (!website.match(urlPattern)) {
            alert("Invalid URL");
            return;
        }
        
        var websitereplace = website.replace(/.*(\/\/|www.)/gim, '').split(/\/$/gim)[0];

        GM_xmlhttpRequest({
            method: "GET",
            url: 'https://www.google.com/search?q="' + websitereplace + '" -site:' + websitereplace,
            onload: function (response) {
                if (response.responseText.includes('id="result-stats"')) {
                    var popularity = response.responseText.split('<div id="result-stats">').pop().split('<nobr>')[0];
                    alert(popularity);
                    
                    console.log(`%c ${GM_info.script.name} %c (Verified Original)`, 
                                "background: #4285F4; color: white; font-weight: bold; padding: 2px 5px;", "color: #4285F4;");
                } else {
                    alert("Google might be showing a Captcha. Please try again later or visit Google search manually.");
                }
            }
        });
    });

    GM_registerMenuCommand("🎁 Donate", function () {
alert("Hello, I'm " + GM_info.script.author + "\nand I wrote this script as a hobby.\nIf you find it useful, I would appreciate a small donation! =)");
    window.open(GM_info.script.header.match(/@contributionURL\s+(.+)/)[1], "_blank");
    });

    if (_isOriginal) {
        console.log(`%c ${GM_info.script.name} v${GM_info.script.version} %c (Verified Original)`, 
                    "background: #f44336; color: white; font-weight: bold; padding: 2px 5px;", "color: #f44336;");
    }

})();