Userscript: Arhivach.cf Image Options (Reverse + DDL)

// ==UserScript==
// @name         Arhivach Image Options
// @version      0.1
// @description  Adds direct download button and reverse image search options
// @author       ему
// @match        https://arhivach.cf/thread/*
// @require      https://code.jquery.com/jquery-3.2.1.min.js
// @require      https://use.fontawesome.com/releases/v5.0.10/js/all.js
// ==/UserScript==

this.$ = this.jQuery = jQuery.noConflict(true);

function getReverseImageSearchOptions(url)
{
    var options = {
        'google': 'https://www.google.com/searchbyimage?image_url=' + url + '&safe=off',
        'yandex': 'https://www.yandex.com/images/search?rpt=imageview&img_url=' + url,
        'iqdb': 'https://iqdb.org/?url=' + url
    };

    return options;
}

var re = new RegExp('(mp4|webm)');

$(document).ready(function(){

  var use_style = 'text-decoration: none; margin-left: 5px; font-size: 10px;';

  $(".post_image_block").each(function(index)
  {
    var file_url = $(this).find('.img_filename');

    if(file_url != undefined) {
        $reverse_options = getReverseImageSearchOptions(file_url.attr('href'));

        if(re.test(file_url.attr('href')))
        {
          $reverse_options = getReverseImageSearchOptions($(this).find('.post_image > img').attr('src'));
        }

        var first_c = $(this).find(">:first-child");

        var direct_download = '<a style="' + use_style + '" href="' + file_url.attr('href')  + '" download="' + file_url.text() + '"><i title="Download: ' + file_url.text() + '" class="fa fa-download"></i></a>';
        var r_google = '<a style="' + use_style + '" target="_blank" href="' + $reverse_options['google']  + '"><i title="Google" class="fab fa-google"></i></a>';
        var r_yandex = '<a style="' + use_style + '" target="_blank" href="' + $reverse_options['yandex']  + '"><i title="Yandex" class="fab fa-yandex-international"></i></a>';

        first_c.after(direct_download + r_google + r_yandex);

    }
  });

});