fix(Player): Fix global variable extraction in the deciphering code (#1029)

Author: absidue

src/core/Player.ts

@@ -286,7 +286,7 @@ export default class Player {
     if (!functions || !var_name)
       Log.warn(TAG, 'Failed to extract signature decipher algorithm.');
 
-    return `${global_variable?.result || ''} function descramble_sig(${var_name}) { let ${obj_name}={${functions}}; ${match[2]} } descramble_sig(sig);`;
+    return `${global_variable?.result ? `var ${global_variable.result};` : ''} function descramble_sig(${var_name}) { let ${obj_name}={${functions}}; ${match[2]} } descramble_sig(sig);`;
   }
 
   static extractNSigSourceCode(data: string, ast?: ReturnType<typeof Jinter.parseScript>, global_variable?: ASTLookupResult): string | undefined {
@@ -303,7 +303,7 @@ export default class Player {
         nsig_function = findFunction(data, { includes: '.reverse().forEach(function', ast });
 
       if (nsig_function)
-        return `${global_variable.result} var ${nsig_function.result} ${nsig_function.name}(nsig);`;
+        return `var ${global_variable.result}; var ${nsig_function.result} ${nsig_function.name}(nsig);`;
     }
 
     // This is the suffix of the error tag.

src/utils/Utils.ts

@@ -353,7 +353,7 @@ export function findFunction(source: string, args: ASTLookupArgs): ASTLookupResu
 }
 
 /**
- * Searches for a variable declaration in the given code based on specified criteria.
+ * Searches for a variable declarator in the given code based on specified criteria.
  *
  * @example
  * ```ts
@@ -381,23 +381,21 @@ export function findVariable(code: string, options: ASTLookupArgs): ASTLookupRes
   function walk(node: Node): void {
     if (found) return;
 
-    if (node.type === 'VariableDeclaration') {
+    if (node.type === 'VariableDeclarator') {
       const [ start, end ] = node.range!;
       const node_source = code.slice(start, end);
 
-      for (const declarator of node.declarations) {
-        if (declarator.id.type === 'Identifier') {
-          const var_name = declarator.id.name;
-          if (options.name && var_name === options.name) {
-            found = { start, end, name: var_name, node, result: node_source };
-            return;
-          }
+      if (node.id.type === 'Identifier') {
+        const var_name = node.id.name;
+        if (options.name && var_name === options.name) {
+          found = { start, end, name: var_name, node, result: node_source };
+          return;
         }
       }
       if (
         (options.includes && node_source.includes(options.includes)) ||
         (options.regexp && options.regexp.test(node_source))) {
-        found = { start, end, name: (node.declarations?.[0]?.id as any)?.name, node, result: node_source };
+        found = { start, end, name: (node?.id as any)?.name, node, result: node_source };
         return;
       }
     }