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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         1.16
  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.  * 1.16 - Display improved - CSS applied
  27. */
  28.  
  29. //base64 encoded(http:/*, https:/*) string prefix, defalut depth : 3 / Caution! browser performance impact..
  30. const regArr = [
  31.     /(aHR0cDovL|aHR0cHM6Ly)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 1 time
  32.     /(YUhSMGNEb3ZM|YUhSMGNITTZMe)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 2 time
  33.     /(WVVoU01HTkViM1pN|WVVoU01HTklUVFpNZ)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 3 time
  34.     // /(V1ZWb1UwMUhUa1ZpTTFwT|V1ZWb1UwMUhUa2xVVkZwTl)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 4 time
  35.     // /(VjFaV2IxVXdNVWhVYTFacFRURndU|VjFaV2IxVXdNVWhVYTJ4VlZrWndUb)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 5 time
  36.     // /(VmpGYVYySXhWWGROVldoVllURmFjRlJVUm5kV|VmpGYVYySXhWWGROVldoVllUSjRWbFpyV25kVW)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 6 time
  37.     // /(Vm1wR1lWWXlTWGhXV0dST1ZsZG9WbGxVUm1GalJsSlZVbTVrV|Vm1wR1lWWXlTWGhXV0dST1ZsZG9WbGxVU2pSV2JGcHlWMjVrVl)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 7 time
  38. ];
  39. //max attempt decode depth, regArr length
  40. const max_iter = regArr.length;
  41. //regex prefix - drag
  42. const regInvalid = /[^\w\+\/=]/;
  43.  
  44. //auto add padding - add '=' padding in base64 encoded string
  45. function base64AddPadding(str) {
  46.     return str + Array((4 - str.length % 4) % 4 + 1).join('=');
  47. }
  48.  
  49. //base64 decode
  50. var Base64 = {
  51.     _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  52.     decode : function (input) {
  53.         var output = "";
  54.         var chr1, chr2, chr3;
  55.         var enc1, enc2, enc3, enc4;
  56.         var i = 0;
  57.  
  58.         input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
  59.  
  60.         while (i < input.length) {
  61.             enc1 = this._keyStr.indexOf(input.charAt(i++));
  62.             enc2 = this._keyStr.indexOf(input.charAt(i++));
  63.             enc3 = this._keyStr.indexOf(input.charAt(i++));
  64.             enc4 = this._keyStr.indexOf(input.charAt(i++));
  65.  
  66.             chr1 = (enc1 << 2) | (enc2 >> 4);
  67.             chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
  68.             chr3 = ((enc3 & 3) << 6) | enc4;
  69.  
  70.             output = output + String.fromCharCode(chr1);
  71.  
  72.             if (enc3 != 64) {
  73.                 output = output + String.fromCharCode(chr2);
  74.             }
  75.             if (enc4 != 64) {
  76.                 output = output + String.fromCharCode(chr3);
  77.             }
  78.         }
  79.  
  80.         output = Base64._utf8_decode(output);
  81.         return output;
  82.     },
  83.     // private method for UTF-8 decoding
  84.     _utf8_decode : function (utftext) {
  85.         var string = "";
  86.         var i = 0;
  87.         var c = 0;
  88.         var c1 = 0;
  89.         var c2 = 0;
  90.         var c3 = 0;
  91.  
  92.         while ( i < utftext.length ) {
  93.             c = utftext.charCodeAt(i);
  94.             if (c < 128) {
  95.                 string += String.fromCharCode(c);
  96.                 i++;
  97.             }
  98.             else if((c > 191) && (c < 224)) {
  99.                 c2 = utftext.charCodeAt(i+1);
  100.                 string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
  101.                 i += 2;
  102.             }
  103.             else {
  104.                 c2 = utftext.charCodeAt(i+1);
  105.                 c3 = utftext.charCodeAt(i+2);
  106.                 string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
  107.                 i += 3;
  108.             }
  109.         }
  110.         return string;
  111.     }
  112. };
  113.  
  114. var hindex = 0; //total decode count
  115.  
  116. //drag function comparison
  117. var lastSelected = document;
  118. var lastSelectedTime = Date.now();
  119.  
  120. //create link each components
  121. function createLink(src, index, url, depth) {
  122.   //n번째 링크 (base64 깊이: 0) [ ABCDEF= ]
  123.   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> [ <span style="font-size: 87.5%;color: rgb(71 188 115);">' + src.toString() + '</span> ]';
  124. }
  125.  
  126. //decode & generate
  127. function replacerGen(numIter) {
  128.   return function(source) {
  129.       try {
  130.         rstring = ""; //return msg
  131.         console.log(source); //source
  132.  
  133.         //decode
  134.         var converted = Base64.decode(base64AddPadding(source));
  135.         //attempt to decode nested base64 encoded string
  136.         for(var i=0; i<numIter; i++) {
  137.             converted = Base64.decode(base64AddPadding(converted));
  138.         }
  139.         hindex++;
  140.  
  141.         //remove invalid string - �
  142.         converted = decodeURI(encodeURI(converted).replaceAll('%00', ''));
  143.  
  144.         //split by new line
  145.         converted = converted.split(/\r?\n/);
  146.         //single component
  147.         if (converted.length == 2 && converted[converted.length-1] == '') {
  148.           rstring += createLink(source, hindex, converted[0], numIter+1);
  149.         //multiple component
  150.         } else if (converted.length > 1) {
  151.           rstring += '[ <span style="font-size: 87.5%;color: rgb(71 188 115);">' + source.toString() + '</span> ]';
  152.           nindex = 1;
  153.           converted.forEach(function(j) {
  154.             if (j != '') {
  155.               rstring += '<br>' + createLink('링크 자동 분할 : ' + nindex.toString() + '번째', hindex, j, numIter+1);
  156.               hindex++;
  157.               nindex++;
  158.             }
  159.           });
  160.           //last components
  161.           hindex--;
  162.           nindex--;
  163.  
  164.           rstring = '<span style="color: rgb(232 62 140);"><b><i>분할된 링크 총 ' + nindex + '개</i></b></span> ' + rstring;
  165.         } else rstring += createLink(source, hindex, converted, numIter+1);
  166.         return rstring;
  167.     } catch(e) {
  168.         console.log(e);
  169.         console.log('base64 변환 실패 : ' + source);
  170.     }
  171.     return '[ base64 변환 실패 : ' + source + ' ]';
  172.   };
  173. }
  174.  
  175. //user drag event
  176. //function disabled
  177. function selClicked(event) {
  178.   var sel = document.getSelection().toString();
  179.   if (!sel.match(regInvalid) && sel.length >= 10 && lastSelectedTime + 200 < Date.now()) {
  180.     try {
  181.       var converted = decodeURI(encodeURI(Base64.decode(base64AddPadding(sel))).replaceAll('%00', ''));
  182.       this.innerHTML = this.innerHTML.replace(sel, converted);
  183.       this.removeEventListener('click', selClicked);
  184.     } catch (e) {
  185.       return;
  186.     } finally {
  187.     }
  188.   }
  189. }
  190.  
  191. //main
  192. (function() {
  193.   'use strict';
  194.  
  195.   //article
  196.   var article = document.getElementsByClassName("article-content")[0];
  197.   for(var i=0; i<max_iter; i++) {
  198.     article.innerHTML = article.innerHTML.replaceAll(regArr[i], replacerGen(i));
  199.   }
  200.  
  201.   //comment
  202.   var comments = document.getElementsByClassName("list-area");
  203.   if(comments.length != 0) {
  204.     for(var j=0; j<max_iter; j++) {
  205.       comments[0].innerHTML = comments[0].innerHTML.replaceAll(regArr[j], replacerGen(j));
  206.     }
  207.   }
  208.  
  209.   /*
  210.   //user drag
  211.   document.addEventListener('selectionchange', function() {
  212.     var sel = document.getSelection().anchorNode;
  213.     if(sel) {
  214.       sel = sel.parentElement;
  215.       if(sel != lastSelected) {
  216.         lastSelected.removeEventListener('click', selClicked);
  217.         sel.addEventListener('click', selClicked);
  218.         lastSelected = sel;
  219.         lastSelectedTime = Date.now();
  220.       }
  221.     }
  222.   })
  223.   */
  224.  
  225. })();