// ==UserScript==
// @name         FMHY Base64 Rentry Decoder-Linkifier
// @version      1.1
// @description  Decode base64-encoded links in some pastebins and make URLs clickable
//
// @include      /^https:\/\/rentry\.(?:co|org)\/fmhybase64(?:#.*)?/
//
// @match        https://pastes.fmhy.net/*
// @match        https://rentry.co/*
// @match        https://rentry.org/*
//
// @grant        none
// @icon         https://www.google.com/s2/favicons?sz=64&domain=fmhy.pages.dev
// @namespace https://greasyfork.org/users/980489
// @downloadURL none
// ==/UserScript==


(function() {
    'use strict';

    // Regular expression to match base64-encoded strings
    const base64Regex = /^[A-Za-z0-9+/]+={0,2}$/;

    // Function to decode base64 string
    function decodeBase64(encodedString) {
        return atob(encodedString);
    }

    // Function to check if a string is a URL
    function isURL(string) {
        try {
            new URL(string);
            return true;
        } catch (_) {
            return false;
        }
    }

    // Regex pattern to match the specified URLs (case-insensitive)
    var FMHYmainBase64PageRegex = /^https:\/\/rentry\.(?:co|org)\/fmhybase64(?:#.*)?/i;

    // Check if the current URL matches the regex pattern
    var currentUrl = window.location.href;
    var isFMHYmainBase64PageMatched = FMHYmainBase64PageRegex.test(currentUrl);

    // Select appropriate tags based on the URL matching
    var elementsToCheck = isFMHYmainBase64PageMatched ? document.querySelectorAll('code') : document.querySelectorAll('code, p');

    // Loop through each selected element
    elementsToCheck.forEach(function(element) {
        // Get the content of the element
        var content = element.textContent.trim();

        // Check if the content matches the base64 regex
        if (base64Regex.test(content)) {
            // Decode the base64-encoded string
            var decodedString = decodeBase64(content);

            // If the decoded string is a URL, create a clickable link
            if (isURL(decodedString)) {
                var link = document.createElement('a');
                link.href = decodedString;
                link.textContent = decodedString;
                link.target = '_blank'; // Open link in a new tab
                element.textContent = ''; // Clear the content of the element
                element.appendChild(link); // Append the link to the element
            } else {
                // Replace the content of the element with the decoded string
                element.textContent = decodedString;
            }
        }
    });
})();