☰

Arca base64 autodecoder

Arca.live Base64 auto decoder

当前为 2023-12-18 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name            Arca base64 autodecoder
  3. // @name:ko         아카라이브 Base64 자동 디코더
  4. // @version         1.151a
  5. // @author          Laria
  6. // @match           https://arca.live/b/*/*
  7. // @description     Arca.live Base64 auto decoder
  8. // @description:ko  아카라이브 Base64 자동 복호화 스크립트
  9. // @icon            https://www.google.com/s2/favicons?sz=64&domain=arca.live
  10. // @license         MIT
  11. // @encoding        utf-8
  12. // @run-at          document-end
  13. // @supportURL      https://greasyfork.org/ko/scripts/482577-arca-base64-autodecoder
  14. // @namespace       https://greasyfork.org/users/1235854
  15. // ==/UserScript==
  16.  
  17. /*
  18.  * == Change log ==
  19.  * 1.0 - Release
  20.  * 1.1 - Invalid character update (replace -> replaceAll)
  21.  * 1.11 - Improved show multiple links
  22.  * 1.12 - Show Single links Bugfix
  23.  * 1.13 - Bugfix 1.12
  24.  * 1.14 - Base64 add padding func
  25.  * 1.15 - Add annotation, display improvements
  26. */
  27.  
  28. //max attempt decode depth, default:3
  29. const max_iter = 3;
  30. //regex prefix - common
  31. const regArr = [
  32.     /(aHR0cDovL|aHR0cHM6Ly)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 1 time
  33.     /(YUhSMGNEb3ZM|YUhSMGNITTZMe)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 2 time
  34.     /(WVVoU01HTkViM1pN|WVVoU01HTklUVFpNZ)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 3 time
  35. ];
  36. //regex prefix - drag
  37. const regInvalid = /[^\w\+\/=]/;
  38.  
  39. //auto add padding - add '=' padding in base64 encoded string
  40. function base64AddPadding(str) {
  41.     return str + Array((4 - str.length % 4) % 4 + 1).join('=');
  42. }
  43.  
  44. //base64 decode
  45. var Base64 = {
  46.     _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  47.     decode : function (input) {
  48.         var output = "";
  49.         var chr1, chr2, chr3;
  50.         var enc1, enc2, enc3, enc4;
  51.         var i = 0;
  52.  
  53.         input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
  54.  
  55.         while (i < input.length) {
  56.             enc1 = this._keyStr.indexOf(input.charAt(i++));
  57.             enc2 = this._keyStr.indexOf(input.charAt(i++));
  58.             enc3 = this._keyStr.indexOf(input.charAt(i++));
  59.             enc4 = this._keyStr.indexOf(input.charAt(i++));
  60.  
  61.             chr1 = (enc1 << 2) | (enc2 >> 4);
  62.             chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
  63.             chr3 = ((enc3 & 3) << 6) | enc4;
  64.  
  65.             output = output + String.fromCharCode(chr1);
  66.  
  67.             if (enc3 != 64) {
  68.                 output = output + String.fromCharCode(chr2);
  69.             }
  70.             if (enc4 != 64) {
  71.                 output = output + String.fromCharCode(chr3);
  72.             }
  73.         }
  74.  
  75.         output = Base64._utf8_decode(output);
  76.         return output;
  77.     },
  78.     // private method for UTF-8 decoding
  79.     _utf8_decode : function (utftext) {
  80.         var string = "";
  81.         var i = 0;
  82.         var c = 0;
  83.         var c1 = 0;
  84.         var c2 = 0;
  85.         var c3 = 0;
  86.  
  87.         while ( i < utftext.length ) {
  88.             c = utftext.charCodeAt(i);
  89.             if (c < 128) {
  90.                 string += String.fromCharCode(c);
  91.                 i++;
  92.             }
  93.             else if((c > 191) && (c < 224)) {
  94.                 c2 = utftext.charCodeAt(i+1);
  95.                 string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
  96.                 i += 2;
  97.             }
  98.             else {
  99.                 c2 = utftext.charCodeAt(i+1);
  100.                 c3 = utftext.charCodeAt(i+2);
  101.                 string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
  102.                 i += 3;
  103.             }
  104.         }
  105.         return string;
  106.     }
  107. };
  108.  
  109. var hindex = 0; //total decode count
  110.  
  111. //drag function comparison
  112. var lastSelected = document;
  113. var lastSelectedTime = Date.now();
  114.  
  115. //create link each components
  116. function createLink(orig, index, url, depth) {
  117.   //n번째 링크 (base64 깊이: 0) [ ABCDEF= ]
  118.   return '<a href="' + url + '" title="' + url + ' (새 창으로 열기)" target="_blank" rel="external nofollow noopener noreferrer">' + index.toString() + '번째 링크 (base64 깊이: ' + depth.toString() + ')</a> [ <code>' + orig.toString() + '</code> ]';
  119. }
  120.  
  121. //decode & generate
  122. function replacerGen(numIter) {
  123.   return function(source) {
  124.       try {
  125.         return_f = ""; //return msg
  126.         console.log(source); //source
  127.  
  128.         //decode
  129.         var converted = Base64.decode(base64AddPadding(source));
  130.         //attempt to decode nested base64 encoded string
  131.         for(var i=0; i<numIter; i++) {
  132.             converted = Base64.decode(base64AddPadding(converted));
  133.         }
  134.         hindex++;
  135.  
  136.         //remove invalid string - �
  137.         converted = decodeURI(encodeURI(converted).replaceAll('%00', ''));
  138.  
  139.         //split by new line
  140.         converted = converted.split(/\r?\n/);
  141.         //single component
  142.         if (converted.length == 2 && converted[converted.length-1] == '') {
  143.           return_f += createLink(source, hindex, converted[0], numIter+1);
  144.         //multiple component
  145.         } else if (converted.length > 1) {
  146.           return_f += '[ ' + source.toString() + ' ]';
  147.           nindex = 1;
  148.           converted.forEach(function(j) {
  149.             if (j != '') {
  150.               return_f += '<br>' + createLink('링크 자동 분할 : ' + nindex.toString() + '번째', hindex, j, numIter+1);
  151.               hindex++;
  152.               nindex++;
  153.             }
  154.           });
  155.           //last components
  156.           hindex--;
  157.           nindex--;
  158.  
  159.           return_f = '분할된 링크 총 ' + nindex + '개 ' + return_f;
  160.         } else return_f += createLink(source, hindex, converted, numIter+1);
  161.         return return_f;
  162.     } catch(e) {
  163.         console.log(e);
  164.         console.log('base64 변환 실패 : ' + source);
  165.     }
  166.     return '[ base64 변환 실패 : ' + source + ' ]';
  167.   };
  168. }
  169.  
  170. //user drag event
  171. //function disabled
  172. function selClicked(event) {
  173.   var sel = document.getSelection().toString();
  174.   if (!sel.match(regInvalid) && sel.length >= 10 && lastSelectedTime + 200 < Date.now()) {
  175.     try {
  176.       var converted = decodeURI(encodeURI(Base64.decode(base64AddPadding(sel))).replaceAll('%00', ''));
  177.       this.innerHTML = this.innerHTML.replace(sel, converted);
  178.       this.removeEventListener('click', selClicked);
  179.     } catch (e) {
  180.       return;
  181.     } finally {
  182.     }
  183.   }
  184. }
  185.  
  186. //main
  187. (function() {
  188.   'use strict';
  189.  
  190.   //article
  191.   var article = document.getElementsByClassName("article-content")[0];
  192.   for(var i=0; i<max_iter; i++) {
  193.     article.innerHTML = article.innerHTML.replaceAll(regArr[i], replacerGen(i));
  194.   }
  195.  
  196.   //comment
  197.   var comments = document.getElementsByClassName("list-area");
  198.   if(comments.length != 0) {
  199.     for(var j=0; j<max_iter; j++) {
  200.       comments[0].innerHTML = comments[0].innerHTML.replaceAll(regArr[j], replacerGen(j));
  201.     }
  202.   }
  203.  
  204.   /*
  205.   //user drag
  206.   document.addEventListener('selectionchange', function() {
  207.     var sel = document.getSelection().anchorNode;
  208.     if(sel) {
  209.       sel = sel.parentElement;
  210.       if(sel != lastSelected) {
  211.         lastSelected.removeEventListener('click', selClicked);
  212.         sel.addEventListener('click', selClicked);
  213.         lastSelected = sel;
  214.         lastSelectedTime = Date.now();
  215.       }
  216.     }
  217.   })
  218.   */
  219.  
  220. })();