Arca.live Base64 auto decoder
目前為
// ==UserScript==
// @name Arca base64 autodecoder
// @name:ko 아카라이브 Base64 자동 디코더
// @version 1.18
// @author Laria
// @match https://arca.live/b/*/*
// @description Arca.live Base64 auto decoder
// @description:ko 아카라이브 Base64 자동 복호화 스크립트
// @icon https://www.google.com/s2/favicons?sz=64&domain=arca.live
// @license MIT
// @encoding utf-8
// @run-at document-end
// @supportURL https://greasyfork.org/ko/scripts/482577-arca-base64-autodecoder
// @namespace https://greasyfork.org/users/1235854
// @grant GM.setValue
// @grant GM.getValue
// ==/UserScript==
/*
* == Change log ==
* 1.0 - Release
* 1.1 - Invalid character update (replace -> replaceAll)
* 1.11 - Improved show multiple links
* 1.12 - Show Single links Bugfix
* 1.13 - Bugfix 1.12
* 1.14 - Base64 add padding func
* 1.15 - Add annotation, display improvements
* 1.16 - Display improved - CSS applied
* 1.17 - var safe, max_iter defined (~7, def:3)
* 1.18 - auto update check, log system
*/
//max attempt decode depth, defalut depth : 3
//Caution! browser performance impact..
var max_iter = 3;
//base64 encoded(http:/*, https:/*) string prefix
const regArr = [
/(aHR0cDovL|aHR0cHM6Ly)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 1 time
/(YUhSMGNEb3ZM|YUhSMGNITTZMe)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 2 time
/(WVVoU01HTkViM1pN|WVVoU01HTklUVFpNZ)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 3 time
/(V1ZWb1UwMUhUa1ZpTTFwT|V1ZWb1UwMUhUa2xVVkZwTl)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 4 time
/(VjFaV2IxVXdNVWhVYTFacFRURndU|VjFaV2IxVXdNVWhVYTJ4VlZrWndUb)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 5 time
/(VmpGYVYySXhWWGROVldoVllURmFjRlJVUm5kV|VmpGYVYySXhWWGROVldoVllUSjRWbFpyV25kVW)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 6 time
/(Vm1wR1lWWXlTWGhXV0dST1ZsZG9WbGxVUm1GalJsSlZVbTVrV|Vm1wR1lWWXlTWGhXV0dST1ZsZG9WbGxVU2pSV2JGcHlWMjVrVl)(\w|=|\+|\/)*(?=[^\+=\w\/])/g, //encoding 7 time
];
//limit max_iter
max_iter = max_iter > regArr.length ? regArr.length : max_iter;
//regex prefix - drag
const regInvalid = /[^\w\+\/=]/;
//update chk
var upd_chk = true;
//info param
const sc_name = '['+GM.info.script.name+']';
const sc_name_upd = '['+GM.info.script.name+'-UPD]';
const sc_ver = GM.info.script.version;
//auto add padding - add '=' padding in base64 encoded string
function base64AddPadding(str) {
return str + Array((4 - str.length % 4) % 4 + 1).join('=');
}
//base64 decode
var Base64 = {
_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
decode : function (input) {
var output = "";
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
while (i < input.length) {
enc1 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
//last bits
output = output + String.fromCharCode(chr1);
if (enc3 != 64) { //=
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) { //==
output = output + String.fromCharCode(chr3);
}
}
output = Base64._utf8_decode(output);
return output;
},
// private method for UTF-8 decoding
_utf8_decode : function (utftext) {
var string = "";
var i = 0;
var c = 0;
var c1 = 0;
var c2 = 0;
var c3 = 0;
while ( i < utftext.length ) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
}
else if((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
}
else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
};
var hindex = 0; //total decode count
//drag function comparison
var lastSelected = document;
var lastSelectedTime = Date.now();
//create link each components
function createLink(src, index, url, depth) {
//n번째 링크 (base64 깊이: 0) [ ABCDEF= ]
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> ]';
}
//decode & generate
function replacerGen(numIter) {
return function(source) {
try {
rstring = ""; //return msg
console.log('\n'+sc_name,'No.',(hindex+1).toString(),'encoded link:\n', source.toString()); //source
//decode
var converted = Base64.decode(base64AddPadding(source));
//attempt to decode nested base64 encoded string
for(var i=0; i<numIter; i++) {
converted = Base64.decode(base64AddPadding(converted));
}
hindex++;
//remove invalid string - �
converted = decodeURI(encodeURI(converted).replaceAll('%00', ''));
console.log(sc_name,'No.',hindex.toString(),'decode completed:\n',converted.toString()); //converted
//split by new line
converted = converted.split(/\r?\n/);
//single component
if (converted.length == 2 && converted[converted.length-1] == '') {
rstring += createLink(source, hindex, converted[0], numIter+1);
//multiple component
} else if (converted.length > 1) {
rstring += '[ <span style="font-size: 87.5%;color: rgb(71 188 115);">' + source.toString() + '</span> ]';
nindex = 1;
converted.forEach(function(j) {
if (j != '') {
rstring += '<br>' + createLink('링크 자동 분할 : '+nindex.toString()+'번째', hindex, j, numIter+1);
hindex++;
nindex++;
}
});
//apply last components
hindex--;
nindex--;
console.log(sc_name,'No.',hindex.toString(),'- splitted total :', nindex.toString());
rstring = '<span style="color: rgb(232 62 140);"><b><i>분할된 링크 총 '+nindex.toString()+'개</i></b></span> ' + rstring;
} else rstring += createLink(source, hindex, converted, numIter+1);
return rstring;
} catch(e) {
console.warn('\n'+sc_name,'error occured during decoding:', e);
console.warn(sc_name,'base64 decode fail:', source.toString());
}
return '<span style="color: rgb(255 0 0);">[ base64 변환 실패: '+source.toString()+' ]</span>';
};
}
//user drag event
//function disabled
function selClicked(event) {
var sel = document.getSelection().toString();
if (!sel.match(regInvalid) && sel.length >= 10 && lastSelectedTime + 200 < Date.now()) {
try {
console.log(sc_name,'live match - ' + sel.toString());
var converted = decodeURI(encodeURI(Base64.decode(base64AddPadding(sel))).replaceAll('%00', ''));
console.log(sc_name,'converted - ' + converted.toString());
this.innerHTML = this.innerHTML.replace(sel, converted);
} catch (e) {
return;
} finally {
this.removeEventListener('click', selClicked);
}
}
}
//update check
function checkForUpdate(){
if (!upd_chk) {
console.log(sc_name_upd,'updchk skipped.');
return;
}
const tar_sc = 'https://update.greasyfork.org/scripts/482577/Arca%20base64%20autodecoder.user.js';
fetch(tar_sc)
.then(response => response.text())
.then(data => {
//extract version from greaskyfork script
const match = data.match(/@version\s+(\d+\.\d+)/);
if (match) {
const tar_version = parseFloat(match[1]);
const cur_version = parseFloat(sc_ver);
//new version detected
if (tar_version > cur_version) {
console.log(sc_name_upd,'new version available. ('+cur_version+' -> '+tar_version+')');
//y/n dialog
if (window.confirm(sc_name+'\n새로운 버전이 감지되었습니다. 업데이트를 권장합니다.\n( 기존버전 : '+cur_version+', 새로운 버전 : '+tar_version+' )\n\n취소를 누르면 앞으로 업데이트 확인 알림을 띄우지 않습니다.')) {
console.log(sc_name_upd,'opening source url..');
window.location.replace(tar_sc);
} else {
GM.setValue('chkupd', false);
console.log(sc_name_upd,'updchk disabled.');
window.alert(sc_name+'\n앞으로 업데이트 확인 알림을 띄우지 않습니다.');
}
} else {
console.log(sc_name_upd,'latest version detected.');
}
} else {
console.error(sc_name_upd,'unable to extract version..');
}
})
.catch(error => {
upd_chk = false;
console.error(sc_name_upd,'link unreachable.. -', error);
});
upd_chk = false;
}
//main
(async () => {
'use strict';
//chk browser env
if(((navigator.language || navigator.userLanguage) != 'ko-KR')) console.warn('Warning! this script support only korean language..');
console.log(sc_name,'V',sc_ver,'ready');
//get extension env
if(GM.info.scriptWillUpdate) {
//get env
upd_chk = await GM.getValue('chkupd', true);
//chk update
await checkForUpdate();
}
//article
var article = document.getElementsByClassName("article-content")[0];
for(var i=0; i<max_iter; i++) {
article.innerHTML = article.innerHTML.replaceAll(regArr[i], replacerGen(i));
}
//comment
var comments = document.getElementsByClassName("list-area");
if(comments.length != 0) {
for(var j=0; j<max_iter; j++) {
comments[0].innerHTML = comments[0].innerHTML.replaceAll(regArr[j], replacerGen(j));
}
}
/*
//user drag
console.log('USR-Drag enabled.');
document.addEventListener('selectionchange', function() {
var sel = document.getSelection().anchorNode;
if(sel) {
sel = sel.parentElement;
if(sel != lastSelected) {
lastSelected.removeEventListener('click', selClicked);
sel.addEventListener('click', selClicked);
lastSelected = sel;
lastSelectedTime = Date.now();
}
}
})
*/
console.log(sc_name,'total',hindex.toString(),'decode task completed.');
})();