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Frenschan Thread Image Downloader

Downloads all images individually in a frenschan thread with original filenames (by default).

  1. // ==UserScript==
  2. // @name        Frenschan Thread Image Downloader
  3. // @namespace   Violentmonkey Scripts
  4. // @match       https://*.frenschan.com/*/res/*.html
  5. // @match       https://*.frenschan.org/*/res/*.html
  6. // @grant       GM_download
  7. // @grant       GM_registerMenuCommand
  8. // @version     1.2.1
  9. // @license     The Unlicense
  10. // @author      ImpatientImport
  11. // @description Downloads all images individually in a frenschan thread with original filenames (by default).
  12. // ==/UserScript==
  13.  
  14.  
  15. /* EDIT BELOW THIS LINE */
  16.  
  17. // User preferences
  18.  
  19. var download_limit = 3000; // speed in milliseconds to delay
  20.  
  21. /* EDIT ABOVE THIS LINE */
  22.  
  23.  
  24. function sleep(ms) {
  25.     return new Promise(resolve => setTimeout(resolve, ms));
  26. }
  27.  
  28. (function() {
  29.   'use strict';
  30.   
  31.   // Constants for later reference
  32.   const top_of_thread = document.getElementsByClassName("intro")[0];
  33.   const thread_URL = document.URL;
  34.   const tinyboard_site = thread_URL.toString().split('/')[2];
  35.   const url_path = new URL(thread_URL).pathname;
  36.   const url_path_split = url_path.toString().split('/')
  37.   const thread_board = url_path_split[1];
  38.   const thread_num = url_path_split[3].split(".")[0];
  39.   
  40.   const json_url = "https://"+ tinyboard_site + "/"+ thread_board +"/res/"+ thread_num + ".json"; // important
  41.   
  42.   var media_arr=[], media_fnames=[];
  43.   
  44.   // Gets the JSON file for the Tinyboard thread
  45.   async function get_archive_thread() {
  46.     const site_response = await fetch(json_url);
  47.     const JSON_file = await site_response.json();
  48.     console.log(JSON_file); // debug
  49.     retrieve_media(JSON_file);
  50.     download_images();
  51.   }
  52.   
  53.   // Retrieves media from the thread (in JSON format)
  54.   function retrieve_media(thread_obj) {
  55.     
  56.     const posts_exist = thread_obj.posts != undefined;
  57.  
  58.     if (posts_exist) {
  59.       const thread_posts = thread_obj.posts;
  60.       //const post_nums = Object.keys(thread_posts);
  61.       const posts_length = thread_posts.length;
  62.       
  63.       for (let i = 0; i < posts_length; i++) {
  64.         
  65.           if(thread_posts[i].tim != null && thread_posts[i].ext != "deleted"){
  66.             media_arr.push("https://" + tinyboard_site + "/" + thread_board + "/src/" + thread_posts[i].tim + thread_posts[i].ext );
  67.             media_fnames.push(thread_posts[i].filename + thread_posts[i].ext);
  68.             
  69.             //in case of more than one image in post
  70.             var extra = thread_posts[i].extra_files
  71.             if(extra != null){
  72.               
  73.               for (let j=0; j < extra.length; j++){
  74.                 media_arr.push("https://" + tinyboard_site + "/" + thread_board + "/src/" + extra[j].tim + extra[j].ext );
  75.                 media_fnames.push(extra[j].filename + extra[j].ext);
  76.               }
  77.               
  78.             }
  79.             
  80.             
  81.           }
  82.         
  83.       }
  84.       
  85.     }
  86.     
  87.   }
  88.     
  89.   async function download_images(){
  90.  
  91.     for (var i=0; i<media_arr.length; i++){
  92.  
  93.       await sleep(download_limit);
  94.       
  95.       console.log(media_arr[i]);
  96.  
  97.       GM_download(media_arr[i], media_fnames[i]) // downloads images
  98.       
  99.     }
  100.   }
  101.   
  102.   GM_registerMenuCommand("Download all thread images individually", get_archive_thread);
  103.   
  104.   var indiv_dl_btn;
  105.   var indiv_dlbtn_elem;
  106.   indiv_dl_btn = document.createElement('a');
  107.   indiv_dl_btn.id = "indiv_btn";
  108.   indiv_dl_btn.innerText = "[Download Images]";
  109.   top_of_thread.append(indiv_dl_btn);
  110.   indiv_dlbtn_elem = document.getElementById("indiv_btn");
  111.   indiv_dl_btn.addEventListener("click", get_archive_thread);
  112.   
  113. })();