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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      1.13
  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 Bugfixlinks
  17.  * 1.13 - Show Single links Bugfix
  18. */
  19.  
  20. const regArr = [
  21.     /(aHR0cDovL|aHR0cHM6Ly)(\w|=|\+|\/)*(?=[^\+=\w\/])/g,
  22.     /(YUhSMGNEb3ZM|YUhSMGNITTZMe)(\w|=|\+|\/)*(?=[^\+=\w\/])/g,
  23.     /(WVVoU01HTkViM1pN|WVVoU01HTklUVFpNZ)(\w|=|\+|\/)*(?=[^\+=\w\/])/g,
  24. ]
  25. const regInvalid = /[^\w\+\/=]/;
  26.  
  27.  
  28. var Base64 = {
  29.     _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  30.     decode : function (input) {
  31.         var output = "";
  32.         var chr1, chr2, chr3;
  33.         var enc1, enc2, enc3, enc4;
  34.         var i = 0;
  35.  
  36.         input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
  37.  
  38.         while (i < input.length) {
  39.             enc1 = this._keyStr.indexOf(input.charAt(i++));
  40.             enc2 = this._keyStr.indexOf(input.charAt(i++));
  41.             enc3 = this._keyStr.indexOf(input.charAt(i++));
  42.             enc4 = this._keyStr.indexOf(input.charAt(i++));
  43.  
  44.             chr1 = (enc1 << 2) | (enc2 >> 4);
  45.             chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
  46.             chr3 = ((enc3 & 3) << 6) | enc4;
  47.  
  48.             output = output + String.fromCharCode(chr1);
  49.  
  50.             if (enc3 != 64) {
  51.                 output = output + String.fromCharCode(chr2);
  52.             }
  53.             if (enc4 != 64) {
  54.                 output = output + String.fromCharCode(chr3);
  55.             }
  56.         }
  57.  
  58.         output = Base64._utf8_decode(output);
  59.         return output;
  60.     },
  61.     // private method for UTF-8 decoding
  62.     _utf8_decode : function (utftext) {
  63.         var string = "";
  64.         var i = 0;
  65.         var c = 0;
  66.         var c1 = 0;
  67.         var c2 = 0;
  68.         var c3 = 0;
  69.  
  70.         while ( i < utftext.length ) {
  71.             c = utftext.charCodeAt(i);
  72.             if (c < 128) {
  73.                 string += String.fromCharCode(c);
  74.                 i++;
  75.             }
  76.             else if((c > 191) && (c < 224)) {
  77.                 c2 = utftext.charCodeAt(i+1);
  78.                 string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
  79.                 i += 2;
  80.             }
  81.             else {
  82.                 c2 = utftext.charCodeAt(i+1);
  83.                 c3 = utftext.charCodeAt(i+2);
  84.                 string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
  85.                 i += 3;
  86.             }
  87.         }
  88.         return string;
  89.     }
  90. }
  91.  
  92. var hindex = 0; //total index
  93. const max_iter = 3; //max try decode iteration attamp, def:3
  94.  
  95. var lastSelected = document;
  96. var lastSelectedTime = Date.now();
  97.  
  98. function createLink(orig, index, url, depth) {
  99.     return '<a href="' + url
  100.            + '" target="_blank" rel="noreferrer">' + index.toString()
  101.            + '번째 링크 (base64 깊이: ' + depth.toString()
  102.            + ')</a>'
  103.            + '<br>[ <a>' + orig.toString() + '</a> ]';
  104. }
  105.  
  106. function replacerGen(numIter) {
  107.     return function(match) {
  108.         try {
  109.             return_f = ""; //return msg
  110.             console.log(match)
  111.             var converted = Base64.decode(match);
  112.             for(var i=0; i<numIter; i++) {
  113.                 converted = Base64.decode(converted);
  114.             }
  115.             hindex++;
  116.  
  117.             converted = decodeURI(encodeURI(converted).replaceAll('%00', ''));  //remove invalid string - �
  118.  
  119.             converted = converted.split(/\r?\n/);
  120.  
  121.             console.log(converted)
  122.             console.log(converted.length)
  123.             if ((converted.length == 2 && converted[converted.length-1] == '') || converted.length <= 1) {
  124.               return_f+=createLink(match, hindex, converted, numIter+1);
  125.             } else if (converted.length > 1) {
  126.               return_f+='[ ' + match.toString() + ' ]';
  127.               nindex = 1;
  128.               converted.forEach(function(k) {
  129.                 if (k != '') {
  130.                   console.log(k)
  131.                   return_f+='<br>' + createLink('링크 자동 분할 : ' + nindex.toString() + '번째', hindex, k, numIter+1);
  132.                   hindex++;
  133.                   nindex++;
  134.                 }
  135.               });
  136.               hindex--; //last components
  137.               nindex--;
  138.               return_f = '분할된 링크 총 ' + nindex + '개 ' + return_f;
  139.             } else return_f+=createLink(match, hindex, converted, numIter+1);
  140.  
  141.             return return_f
  142.         } catch(e) {
  143.             console.log(e);
  144.             console.log('base64 변환 실패 : ' + match);
  145.         }
  146.         return '[base64 변환 실패 : ' + match + ']';
  147.     }
  148. }
  149.  
  150. //function disabled
  151. function selClicked(event) {
  152.     var sel = document.getSelection().toString();
  153.     if (!sel.match(regInvalid)
  154.         && sel.length >= 10
  155.         && lastSelectedTime + 200 < Date.now()) {
  156.         try {
  157.             var converted = Base64.decode(sel);
  158.         } catch (e) {
  159.             return;
  160.         } finally {
  161.             this.innerHTML = this.innerHTML.replace(sel, converted);
  162.             this.removeEventListener('click', selClicked);
  163.         }
  164.     }
  165. }
  166.  
  167. (function() {
  168.     'use strict';
  169.  
  170.     var article = document.getElementsByClassName("article-content")[0];
  171.     for(var i=0; i<max_iter; i++) {
  172.         article.innerHTML = article.innerHTML.replaceAll(regArr[i], replacerGen(i));
  173.     }
  174.  
  175.     var comments = document.getElementsByClassName("list-area");
  176.     if(comments.length != 0) {
  177.         for(var i=0; i<max_iter; i++) {
  178.             comments[0].innerHTML = comments[0].innerHTML.replaceAll(regArr[i], replacerGen(i));
  179.         }
  180.     }
  181.     /*
  182.     document.addEventListener('selectionchange', function() {
  183.         var sel = document.getSelection().anchorNode;
  184.         if(sel) {
  185.             sel = sel.parentElement;
  186.             if(sel != lastSelected) {
  187.                 lastSelected.removeEventListener('click', selClicked);
  188.                 sel.addEventListener('click', selClicked);
  189.                 lastSelected = sel;
  190.                 lastSelectedTime = Date.now();
  191.             }
  192.         }
  193.     })*/
  194. })();