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Arca base64 autodecoder

아카라이브 Base64 자동 복호화

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. // @version      1.12
  4. // @author       Laria
  5. // @match        https://arca.live/b/*/*
  6. // @description  아카라이브 Base64 자동 복호화
  7. // @icon         https://www.google.com/s2/favicons?sz=64&domain=arca.live
  8. // @run-at       document-end
  9. // @namespace https://greasyfork.org/users/1235854
  10. // ==/UserScript==
  11.  
  12. /*
  13.  * 1.0 - Release
  14.  * 1.1 - Invalid character update (replace -> replaceAll)
  15.  * 1.11 - Improved show multiple links
  16.  * 1.12 - Show Single links Bugfix
  17. */
  18.  
  19. const regArr = [
  20.     /(aHR0cDovL|aHR0cHM6Ly)(\w|=|\+|\/)*(?=[^\+=\w\/])/g,
  21.     /(YUhSMGNEb3ZM|YUhSMGNITTZMe)(\w|=|\+|\/)*(?=[^\+=\w\/])/g,
  22.     /(WVVoU01HTkViM1pN|WVVoU01HTklUVFpNZ)(\w|=|\+|\/)*(?=[^\+=\w\/])/g,
  23. ]
  24. const regInvalid = /[^\w\+\/=]/;
  25.  
  26.  
  27. var Base64 = {
  28.     _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  29.     decode : function (input) {
  30.         var output = "";
  31.         var chr1, chr2, chr3;
  32.         var enc1, enc2, enc3, enc4;
  33.         var i = 0;
  34.  
  35.         input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
  36.  
  37.         while (i < input.length) {
  38.             enc1 = this._keyStr.indexOf(input.charAt(i++));
  39.             enc2 = this._keyStr.indexOf(input.charAt(i++));
  40.             enc3 = this._keyStr.indexOf(input.charAt(i++));
  41.             enc4 = this._keyStr.indexOf(input.charAt(i++));
  42.  
  43.             chr1 = (enc1 << 2) | (enc2 >> 4);
  44.             chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
  45.             chr3 = ((enc3 & 3) << 6) | enc4;
  46.  
  47.             output = output + String.fromCharCode(chr1);
  48.  
  49.             if (enc3 != 64) {
  50.                 output = output + String.fromCharCode(chr2);
  51.             }
  52.             if (enc4 != 64) {
  53.                 output = output + String.fromCharCode(chr3);
  54.             }
  55.         }
  56.  
  57.         output = Base64._utf8_decode(output);
  58.         return output;
  59.     },
  60.     // private method for UTF-8 decoding
  61.     _utf8_decode : function (utftext) {
  62.         var string = "";
  63.         var i = 0;
  64.         var c = 0;
  65.         var c1 = 0;
  66.         var c2 = 0;
  67.         var c3 = 0;
  68.  
  69.         while ( i < utftext.length ) {
  70.             c = utftext.charCodeAt(i);
  71.             if (c < 128) {
  72.                 string += String.fromCharCode(c);
  73.                 i++;
  74.             }
  75.             else if((c > 191) && (c < 224)) {
  76.                 c2 = utftext.charCodeAt(i+1);
  77.                 string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
  78.                 i += 2;
  79.             }
  80.             else {
  81.                 c2 = utftext.charCodeAt(i+1);
  82.                 c3 = utftext.charCodeAt(i+2);
  83.                 string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
  84.                 i += 3;
  85.             }
  86.         }
  87.         return string;
  88.     }
  89. }
  90.  
  91. var hindex = 0; //total index
  92. const max_iter = 3; //max try decode iteration attamp, def:3
  93.  
  94. var lastSelected = document;
  95. var lastSelectedTime = Date.now();
  96.  
  97. function createLink(orig, index, url, depth) {
  98.     return '<a href="' + url
  99.            + '" target="_blank" rel="noreferrer">' + index.toString()
  100.            + '번째 링크 (base64 깊이: ' + depth.toString()
  101.            + ')</a>'
  102.            + '<br>[ <a>' + orig.toString() + '</a> ]';
  103. }
  104.  
  105. function replacerGen(numIter) {
  106.     return function(match) {
  107.         try {
  108.             return_f = ""; //return msg
  109.             console.log(match)
  110.             var converted = Base64.decode(match);
  111.             for(var i=0; i<numIter; i++) {
  112.                 converted = Base64.decode(converted);
  113.             }
  114.             hindex++;
  115.  
  116.             converted = decodeURI(encodeURI(converted).replaceAll('%00', ''));  //remove invalid string - �
  117.  
  118.             converted = converted.split(/\r?\n/);
  119.  
  120.  
  121.             if (converted.length <= 1 || (converted.length == 1 && converted[converted.length] == '')) {
  122.               return_f+=createLink(match, hindex, converted, numIter+1);
  123.             } else if (converted.length > 1) {
  124.               return_f+='[ ' + match.toString() + ' ]';
  125.               nindex = 1;
  126.               converted.forEach(function(k) {
  127.                 if (k != '') {
  128.                   console.log(k)
  129.                   return_f+='<br>' + createLink('링크 자동 분할 : ' + nindex.toString() + '번째', hindex, k, numIter+1);
  130.                   hindex++;
  131.                   nindex++;
  132.                 }
  133.               });
  134.               hindex--; //last components
  135.               return_f = '분할된 링크 총 ' + nindex + '개 ' + return_f;
  136.             } else return_f+=createLink(match, hindex, converted, numIter+1);
  137.  
  138.             return return_f
  139.         } catch(e) {
  140.             console.log(e);
  141.             console.log('base64 변환 실패 : ' + match);
  142.         }
  143.         return '[base64 변환 실패 : ' + match + ']';
  144.     }
  145. }
  146.  
  147. //function disabled
  148. function selClicked(event) {
  149.     var sel = document.getSelection().toString();
  150.     if (!sel.match(regInvalid)
  151.         && sel.length >= 10
  152.         && lastSelectedTime + 200 < Date.now()) {
  153.         try {
  154.             var converted = Base64.decode(sel);
  155.         } catch (e) {
  156.             return;
  157.         } finally {
  158.             this.innerHTML = this.innerHTML.replace(sel, converted);
  159.             this.removeEventListener('click', selClicked);
  160.         }
  161.     }
  162. }
  163.  
  164. (function() {
  165.     'use strict';
  166.  
  167.     var article = document.getElementsByClassName("article-content")[0];
  168.     for(var i=0; i<max_iter; i++) {
  169.         article.innerHTML = article.innerHTML.replaceAll(regArr[i], replacerGen(i));
  170.     }
  171.  
  172.     var comments = document.getElementsByClassName("list-area");
  173.     if(comments.length != 0) {
  174.         for(var i=0; i<max_iter; i++) {
  175.             comments[0].innerHTML = comments[0].innerHTML.replaceAll(regArr[i], replacerGen(i));
  176.         }
  177.     }
  178.     /*
  179.     document.addEventListener('selectionchange', function() {
  180.         var sel = document.getSelection().anchorNode;
  181.         if(sel) {
  182.             sel = sel.parentElement;
  183.             if(sel != lastSelected) {
  184.                 lastSelected.removeEventListener('click', selClicked);
  185.                 sel.addEventListener('click', selClicked);
  186.                 lastSelected = sel;
  187.                 lastSelectedTime = Date.now();
  188.             }
  189.         }
  190.     })*/
  191. })();