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sas41 / Reddit Video Downloader

// ==UserScript==
// @name                Reddit Video Downloader
// @author              Berk "SAS41" Alyamach
// @homepage            https://github.com/sas41/
// @homepageURL         https://github.com/sas41/
// @description         A script to that allows you to download videos hosted on Reddit by pressing Ctrl+S or Meta+S on the comments section.

// @icon                https://github.com/sas41/RedditVideoDownloader/blob/master/icons/RVD_icon_32.png?raw=true
// @iconURL             https://github.com/sas41/RedditVideoDownloader/blob/master/icons/RVD_icon_32.png?raw=true
// @icon64URL           https://github.com/sas41/RedditVideoDownloader/blob/master/icons/RVD_icon_64.png?raw=true

// @copyright           2018, Berk (sas41) Alyamach - https://github.com/sas41/
// @license             MIT
// @grant               none

// @contributionAmount  €1.00
// @contributionURL     https://www.paypal.me/sas41/1

// @namespace           reddit
// @include             *://*reddit.com/r/*/*/*/*

// @downloadURL         https://raw.githubusercontent.com/sas41/RedditVideoDownloader/master/RedditVideoDownloader.js
// @updateURL           https://raw.githubusercontent.com/sas41/RedditVideoDownloader/master/RedditVideoDownloader.js
// @supportURL          https://github.com/sas41/RedditVideoDownloader/issues
// @version             1.0.5
// ==/UserScript==

// ==OpenUserJS==
// @author              sas41
// @contributionAmount  €1.00
// @contributionURL     https://www.paypal.me/sas41/1
// ==/OpenUserJS==

var jsonLink = document.location.href.split('?')[0] + '.json';
var downloadLink = '';

function getJSON(url) {
  var xhr = new XMLHttpRequest();
  xhr.open('GET', url, true);
  xhr.responseType = 'json';
  xhr.onload = function () {
    var status = xhr.status;
    if (status === 200) {
      var response = xhr.response;
      if (!response[0].data.children[0].data.secure_media.reddit_video.is_gif) {
        if (confirm('Unfortunately, Reddit doesn\'t support saving of audio along with the video, Download without audio?')) {
          downloadLink = response[0].data.children[0].data.secure_media.reddit_video.fallback_url;
          downloadURI(downloadLink, '');
        }
      }
      else {
        downloadLink = response[0].data.children[0].data.secure_media.reddit_video.fallback_url;
        downloadURI(downloadLink, '');
      }
    }
    else {
      alert('Sorry, Download Failed');
    }
  };
  xhr.send();
}

function downloadURI(url, n) {
  var save = document.createElement('a');
  save.href = url;
  save.download = n || url;

  var event = document.createEvent("MouseEvents");
  event.initMouseEvent("click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
  save.dispatchEvent(event);

  try {
    document.body.removeChild(save);
  }
  catch (err) {}
}

document.addEventListener('keydown', (event) => {
  if (event.ctrlKey || event.metaKey) {
    if (event.key === 's' || event.key === 'S') {
      event.preventDefault();
      getJSON(jsonLink);
    }
  }
});