fix: catch any possible errors when transforming the n token

lib/NToken.js

@@ -12,64 +12,72 @@ class NToken {
 
   transform(n) {
     let n_token = n.split('');
-    let transformations = this.getTransformationData(this.raw_code);
-    
-    // Identifies the necessary transformation data and emulates them accordingly.
-    transformations = transformations.map((el) => {
-      if (el != null && typeof el != 'number') {
-        const is_reverse_base64 = el.includes('case 65:');
-        if (el.includes('function(d){for(var')) {
-          el = (arr) => this.pushSplice(arr);
-        } else if (el.includes('d.push(e)')) {
-          el = (arr, item) => this.push(arr, item);
-        } else if (el.includes('d.reverse()')) {
-          el = (arr) => this.reverse(arr);
-        } else if (el.includes('d.length;d.splice(e,1)')) {
-          el = (arr, index) => this.spliceOnce(arr, index);
-        } else if (el.includes('d[0])[0])')) {
-          el = (arr, index) => this.spliceTwice(arr, index);
-        } else if (el.includes('reverse().forEach')) {
-          el = (arr, index) => this.spliceReverseUnshift(arr, index);
-        } else if (el.includes('f=d[0];d[0]')) {
-          el = (arr, index) => this.swapFirstItem(arr, index);
-        } else if (el.includes('unshift(d.pop())')) {
-          el = (arr, index) => this.unshiftPop(arr, index);
-        } else if (el.includes('switch')) {
-          el = (arr, e) => this.translateAB(arr, e, is_reverse_base64);
-        } else if (el === 'b') {
-          el = n_token;
+
+    try {
+      let transformations = this.getTransformationData(this.raw_code);
+
+      // Identifies the necessary transformation data and emulates them accordingly.
+      transformations = transformations.map((el) => {
+        if (el != null && typeof el != 'number') {
+          const is_reverse_base64 = el.includes('case 65:');
+          if (el.includes('function(d){for(var')) {
+            el = (arr) => this.pushSplice(arr);
+          } else if (el.includes('d.push(e)')) {
+            el = (arr, item) => this.push(arr, item);
+          } else if (el.includes('d.reverse()')) {
+            el = (arr) => this.reverse(arr);
+          } else if (el.includes('d.length;d.splice(e,1)')) {
+            el = (arr, index) => this.spliceOnce(arr, index);
+          } else if (el.includes('d[0])[0])')) {
+            el = (arr, index) => this.spliceTwice(arr, index);
+          } else if (el.includes('reverse().forEach')) {
+            el = (arr, index) => this.spliceReverseUnshift(arr, index);
+          } else if (el.includes('f=d[0];d[0]')) {
+            el = (arr, index) => this.swapFirstItem(arr, index);
+          } else if (el.includes('unshift(d.pop())')) {
+            el = (arr, index) => this.unshiftPop(arr, index);
+          } else if (el.includes('switch')) {
+            el = (arr, e) => this.translateAB(arr, e, is_reverse_base64);
+          } else if (el === 'b') {
+            el = n_token;
+          }
         }
-      }
-      return el;
-    });
-    
-    // Fills the null placeholders with a copy of the transformations array.
-    let null_placeholder_positions = [...this.raw_code.matchAll(this.null_placeholder_regex)].map((item) => parseInt(item[1]));
-    null_placeholder_positions.forEach((pos) => transformations[pos] = transformations);
-    
-    // Parses and emulates calls to functions of the transformations array.
-    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 index = data.index;
-      const param_index = data.params.split(',').map((param) => param.match(/c\[(.*?)\]/)[1]);
-      transformations[index](transformations[param_index[0]], transformations[param_index[1]]);
-    });
-    
+        return el;
+      });
+
+      // Fills the null placeholders with a copy of the transformations array.
+      let null_placeholder_positions = [...this.raw_code.matchAll(this.null_placeholder_regex)].map((item) => parseInt(item[1]));
+      null_placeholder_positions.forEach((pos) => transformations[pos] = transformations);
+
+      // Parses and emulates calls to functions of the transformations array.
+      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 index = data.index;
+        const param_index = data.params.split(',').map((param) => param.match(/c\[(.*?)\]/)[1]);
+        transformations[index](transformations[param_index[0]], transformations[param_index[1]]);
+      });
+    } catch (err) {
+      return n;
+    }
+
     return n_token.join('');
   }
 
   getTransformationData() {
-    let transformation_data = `[${Utils.getStringBetweenStrings(this.raw_code, 'c=[', '];c')}]`;
+    // These variable names have always been the same since earlier player versions, so it should not be a problem for now.
+    let transformation_data = `[${Utils.getStringBetweenStrings(this.raw_code.replace(/\n/g, ''), 'c=[', '];c')}]`;
     transformation_data = transformation_data
-    .replace(/function\(d,e\)/g, '"function(d,e)')
-    .replace(/function\(d\)/g, '"function(d)')
-    .replace(/,b,/g, ',"b",')
-    .replace(/,b/g, ',"b"')
-    .replace(/b,/g, '"b",')
-    .replace(/b]/g, '"b"]')
-    .replace(/},/g, '}",')
-    .replace(/""/g, '')
-    .replace(/length]\)}"/g, 'length])}');
+      .replace(/function\(d,e\)/g, '"function(d,e)')
+      .replace(/function\(d\)/g, '"function(d)')
+      .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])}');
 
     return JSON.parse(transformation_data);
   }

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "youtubei.js",
-  "version": "1.2.2",
+  "version": "1.2.3",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "youtubei.js",
-      "version": "1.2.2",
+      "version": "1.2.3",
       "license": "MIT",
       "dependencies": {
         "axios": "^0.21.4",
@@ -273,4 +273,4 @@
       "integrity": "sha512-lKxKYG6H03yCZUpAGOPOsMcGxd1RHCu1iKvEHYDPmTyq2HueGhD73ssNBqqQWfvYs04G9iUFRvmAVLW20Jw6ow=="
     }
   }
-}
+}

package.json

@@ -1,6 +1,6 @@
 {
   "name": "youtubei.js",
-  "version": "1.2.2",
+  "version": "1.2.3",
   "description": "An object-oriented library that allows you to search, get detailed info about videos, subscribe, unsubscribe, like, dislike, comment, download videos and much more!",
   "main": "index.js",
   "scripts": {
@@ -43,4 +43,4 @@
     "url": "https://github.com/LuanRT/YouTube.js/issues"
   },
   "homepage": "https://github.com/LuanRT/YouTube.js#readme"
-}
+}