fix (n-token): yet again YouTube added new functions that do exactly …

…the same thing as before but in a different way
LuanRT · Nov 13, 2021 · 771c605 · 771c605
1 parent 5670228
commit 771c605
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Showing 2 changed files with 25 additions and 7 deletions.
diff --git a/lib/Constants.js b/lib/Constants.js
@@ -95,7 +95,7 @@ module.exports = {
     NORMAL: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'.split(''),
     REVERSE: '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_'.split('')
   },
-  FUNCS_REGEX: /d\.push\(e\)|d\.reverse\(\)|d\[0\]\)\[0\]\)|f=d\[0];d\[0\]|d\.length;d\.splice\(e,1\)|function\(d\){for\(var|reverse\(\)\.forEach|unshift\(d\.pop\(\)\)|switch/,
+  FUNCS_REGEX: /d\.push\(e\)|d\.reverse\(\)|d\[0\]\)\[0\]\)|f=d\[0];d\[0\]|d\.length;d\.splice\(e,1\)|function\(\){for\(var|function\(d,e,f\){var h=f|function\(d\){for\(var|reverse\(\)\.forEach|unshift\(d\.pop\(\)\)|function\(d,e\){for\(var f/,
   FUNCS: {
     PUSH: 'd.push(e)',
     REVERSE_1: 'd.reverse()',
@@ -105,12 +105,15 @@ module.exports = {
     SWAP0_2: 'f=d[0];d[0]',
     ROTATE_1: 'reverse().forEach',
     ROTATE_2: 'unshift(d.pop())',
-    TRANSLATE: 'switch'
+    BASE64_DIA: 'function(){for(var',
+    TRANSLATE_1: 'function(d,e){for(var f',
+    TRANSLATE_2: 'function(d,e,f){var h=f'
   },
   // Helper functions, felt like Utils.js wasn't the right place for them:
   formatNTransformData: (data) => {
     return data
       .replace(/function\(d,e\)/g, '"function(d,e)').replace(/function\(d\)/g, '"function(d)')
+      .replace(/function\(\)/, '"function()').replace(/function\(d,e,f\)/g, '"function(d,e,f)')
       .replace(/,b,/g, ',"b",').replace(/,b/g, ',"b"').replace(/b,/g, '"b",').replace(/b]/g, '"b"]')
       .replace(/\[b/g, '["b"').replace(/}]/g, '"]').replace(/},/g, '}",').replace(/""/g, '')
       .replace(/length]\)}"/g, 'length])}');

diff --git a/lib/NToken.js b/lib/NToken.js
@@ -19,15 +19,17 @@ class NToken {
         if (el != null && typeof el != 'number') {
           const is_reverse_base64 = el.includes('case 65:');
           (({ // Identifies the transformation functions and emulates them accordingly.
-            [Constants.FUNCS.PUSH]: () => el = (arr, item) => this.push(arr, item),
+            [Constants.FUNCS.PUSH]: () => el = (arr, i) => this.push(arr, i),
             [Constants.FUNCS.SPLICE]: () => el = (arr, i) => this.splice(arr, i),
             [Constants.FUNCS.SWAP0_1]: () => el = (arr, i) => this.swap0(arr, i),
             [Constants.FUNCS.SWAP0_2]: () => el = (arr, i) => this.swap0(arr, i),
             [Constants.FUNCS.ROTATE_1]: () => el = (arr, i) => this.rotate(arr, i),
             [Constants.FUNCS.ROTATE_2]: () => el = (arr, i) => this.rotate(arr, i),
             [Constants.FUNCS.REVERSE_1]: () => el = (arr) => this.reverse(arr),
             [Constants.FUNCS.REVERSE_2]: () => el = (arr) => this.reverse(arr),
-            [Constants.FUNCS.TRANSLATE]: () => el = (arr, token) => this.translate(arr, token, is_reverse_base64)
+            [Constants.FUNCS.BASE64_DIA]: () => el = () => this.getBase64Dia(is_reverse_base64),
+            [Constants.FUNCS.TRANSLATE_1]: () => el = (arr, token) => this.translate1(arr, token, is_reverse_base64),
+            [Constants.FUNCS.TRANSLATE_2]: () => el = (arr, token, base64_dic) => this.translate2(arr, token, base64_dic)
           })[this.getFunc(el)] || (() => el === 'b' && (el = n_token)))();
         }
         return el;
@@ -41,10 +43,11 @@ class NToken {
       let transformation_calls = [...Utils.getStringBetweenStrings(this.raw_code.replace(/\n/g, ''), 'try{', '}catch').matchAll(this.transformation_calls_regex)].map((params) => ({ index: params[1], params: params[2] }));
       transformation_calls.forEach((data) => {
         const param_index = data.params.split(',').map((param) => param.match(/c\[(.*?)\]/)[1]);
-        transformations[data.index](transformations[param_index[0]], transformations[param_index[1]]);
+        const base64_dia = (param_index[2] && transformations[param_index[2]]());
+        transformations[data.index](transformations[param_index[0]], transformations[param_index[1]], base64_dia);
       });
     } catch (err) {
-      console.error(err);
+      console.error('Could not transform n-token, download may be throttled:', err);
       return n;
     }
 
@@ -60,13 +63,25 @@ class NToken {
     return JSON.parse(Constants.formatNTransformData(data));
   }
 
-  translate(arr, token, is_reverse_base64) {
+  translate1(arr, token, is_reverse_base64) {
     const characters = is_reverse_base64 && Constants.BASE64_DIALECT.REVERSE || Constants.BASE64_DIALECT.NORMAL;
     arr.forEach(function(char, index, loc) {
       this.push(loc[index] = characters[(characters.indexOf(char) - characters.indexOf(this[index]) + 64) % characters.length]);
     }, token.split(''));
   }
 
+  translate2(arr, token, characters) {
+    let chars_length = characters.length;
+    arr.forEach(function(char, index, loc) {
+      this.push(loc[index] = characters[(characters.indexOf(char) - characters.indexOf(this[index]) + index + chars_length--) % characters.length]);
+    }, token.split(''));
+  }
+
+  getBase64Dia(is_reverse_base64) {
+    const characters = is_reverse_base64 && Constants.BASE64_DIALECT.REVERSE || Constants.BASE64_DIALECT.NORMAL;
+    return characters;
+  }
+
   swap0(arr, index) {
     const old_value = arr[0];
     index = (index % arr.length + arr.length) % arr.length;