☰

4chan Session ID Unbreaker

Tries to detect and un-break Session IDs posted on 4chan

  1. // ==UserScript==
  2. // @name         4chan Session ID Unbreaker
  3. // @license      GPLv3
  4. // @namespace    https://boards.4chan.org/
  5. // @version      2.4
  6. // @description  Tries to detect and un-break Session IDs posted on 4chan
  7. // @author       ceodoe
  8. // @match        https://boards.4chan.org/*/thread/*
  9. // @match        https://boards.4chan.org/*/res/*
  10. // @match        https://archived.moe/*/thread/*
  11. // @match        https://www.archived.moe/*/thread/*
  12. // @match        https://thebarchive.com/*/thread/*
  13. // @match        https://www.thebarchive.com/*/thread/*
  14. // @icon         https://www.google.com/s2/favicons?sz=64&domain=4chan.org
  15. // @grant        GM_getValue
  16. // @grant        GM_setValue
  17. // @grant        GM_addStyle
  18. // ==/UserScript==
  19. let rememberCopiedIDs = GM_getValue("rememberCopiedIDs", true);
  20. let rememberedIDs = GM_getValue("rememberedIDs", []);
  21. let site = "4chan";
  22.  
  23. if(location.hostname.includes("archived.moe") || location.hostname.includes("thebarchive.com")) {
  24.     site = "foolfuuka";
  25. }
  26.  
  27. GM_addStyle(`
  28.     .fcsidu-rememberedID {
  29.         color: #aaa;
  30.         border-bottom: 1px dotted #aaa;
  31.     }
  32. `);
  33.  
  34. function parsePosts() {
  35.     let posts = document.querySelectorAll("blockquote.postMessage");
  36.  
  37.     if(site == "foolfuuka") {
  38.         posts = document.querySelectorAll("article > div.text, div.post_wrapper > div.text");
  39.     }
  40.  
  41.     for(let i = 0; i < posts.length; i++) {
  42.         if(posts[i].getAttribute("data-fcsidu-parsed") !== "1") {
  43.             posts[i].setAttribute("data-fcsidu-parsed", "1");
  44.  
  45.             // Strip all backlinks as they are likely to contain the magic number 05 that all Session IDs start with
  46.             let postText = posts[i].innerText.replace(/\>\>\b[0-9]+\b/g, "");
  47.             let idStartIndex = postText.indexOf("05");
  48.  
  49.             if(idStartIndex > -1) {
  50.                 let id = "";
  51.  
  52.                 // "Smart" detection mechanism removes all non-alphanumeric chars, then ignores words with
  53.                 // non-hexadecimal chars in them, and tries to build a string exactly 66 chars long
  54.                 let words = postText.substring(idStartIndex).split(/\s/);
  55.                 for(let j = 0; j < words.length && id.length < 66; j++) {
  56.                     let word = words[j].replace(/[^A-Za-z0-9]/g, "");
  57.  
  58.                     if(!word.match(/[^A-Fa-f0-9]/g)) {
  59.                         id += word;
  60.                     }
  61.                 }
  62.  
  63.                 if(id.length == 66) { // All IDs are 66 chars; if we didn't get exactly 66, ID is invalid
  64.                     let opPost = "";
  65.                     if(posts[i].parentNode.classList.contains("op")) {
  66.                         opPost = "overflow: auto;";
  67.                     }
  68.  
  69.                     let archivePost = "border-top: 1px solid; width: fit-content;";
  70.                     if(posts[i].parentNode.tagName.toLowerCase() == "article") {
  71.                         archivePost = "";
  72.                     }
  73.  
  74.                     let html = `
  75.                         <div style="margin-top: 1em; padding: 0.5em; ${archivePost} ${opPost}">
  76.                             <span style="color: #66cc33; font-weight: bold;">Session ID:</span> <span class="fcsidu-session-id ${rememberCopiedIDs && rememberedIDs.includes(id) ? `fcsidu-rememberedID" title="ID has been previously copied` : ``}">${id}</span>
  77.                             <input type="button" class="fcsidu-copy-btn" id="fcsidu-copy-btn-${i}" data-fcsidu-session-id="${id}" style="margin-left: 0.5em;" value="Copy">
  78.                         </div>
  79.                     `;
  80.  
  81.                     posts[i].insertAdjacentHTML("beforeend", html);
  82.  
  83.                     document.getElementById(`fcsidu-copy-btn-${i}`).addEventListener("click", async function() {
  84.                         let tempInput = document.createElement("input");
  85.                         let id = this.getAttribute("data-fcsidu-session-id").trim();
  86.                         tempInput.value = id;
  87.                         tempInput.select();
  88.                         tempInput.setSelectionRange(0,66);
  89.  
  90.                         try {
  91.                             await navigator.clipboard.writeText(tempInput.value);
  92.                             this.value = "✓";
  93.  
  94.                             if(rememberCopiedIDs) {
  95.                                 // Refresh remembered ID list in case it was updated in another tab
  96.                                 rememberedIDs = GM_getValue("rememberedIDs", []);
  97.                                 rememberedIDs.push(id);
  98.                                 GM_setValue("rememberedIDs", rememberedIDs);
  99.                                 updateIDs();
  100.                             }
  101.  
  102.                             window.setTimeout(function() {
  103.                                 document.getElementById(`fcsidu-copy-btn-${i}`).value = "Copy";
  104.                             }, 3000);
  105.                         } catch (err) {
  106.                             alert("Failed to copy to clipboard: " + err);
  107.                         }
  108.                     });
  109.                 }
  110.             }
  111.         }
  112.     }
  113.  
  114.     if(rememberCopiedIDs) {
  115.         updateIDs();
  116.     }
  117. }
  118.  
  119. function setupOptions() {
  120.     let parent =  document.querySelector("div.bottomCtrl");
  121.     
  122.     if(site == "foolfuuka") {
  123.         parent = document.querySelector("#footer");
  124.     } 
  125.  
  126.     let html = `
  127.         <span id="fcsidu-options">
  128.             <input type="checkbox" name="fcsidu-rememberIDs-check" id="fcsidu-rememberIDs-check" ${rememberCopiedIDs ? `checked` : ``}>
  129.             <label for="fcsidu-rememberIDs-check" title="Disabling also clears already remembered IDs">Remember copied Session IDs</label> | 
  130.         </span>
  131.     `;
  132.     parent.insertAdjacentHTML("afterbegin", html);
  133.  
  134.     document.querySelector("#fcsidu-rememberIDs-check").addEventListener("change", function() {
  135.         GM_setValue("rememberCopiedIDs", this.checked);
  136.         
  137.         if(!this.checked) {
  138.             // Clear already remembered IDs on disable
  139.             GM_setValue("rememberedIDs", []);
  140.         }
  141.  
  142.         location.reload();
  143.     });
  144. }
  145.  
  146. function updateIDs() {
  147.     rememberedIDs = GM_getValue("rememberedIDs", []);
  148.     let idElems = document.querySelectorAll(".fcsidu-session-id");
  149.     for(let i = 0; i < idElems.length; i++) {
  150.         if(rememberedIDs.includes(idElems[i].innerText.trim())) {
  151.             idElems[i].classList.add("fcsidu-rememberedID");
  152.             idElems[i].title = "ID has been previously copied";
  153.         }
  154.     }
  155. }
  156.  
  157. new MutationObserver(function(event) { parsePosts(); }).observe(document.querySelector("div.thread"), {childList: true});
  158. setupOptions();
  159. parsePosts();