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FunctionObfuscator.ts
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62 lines (54 loc) · 1.85 KB
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import * as estraverse from 'estraverse';
import { IFunctionNode } from "../interfaces/nodes/IFunctionNode";
import { INode } from "../interfaces/nodes/INode";
import { NodeObfuscator } from './NodeObfuscator';
import { NodeUtils } from "../NodeUtils";
import { Utils } from '../Utils';
/**
* replaces:
* function foo (argument1) { return argument1; };
*
* on:
* function foo (_0x12d45f) { return _0x12d45f; };
*
*/
export class FunctionObfuscator extends NodeObfuscator {
/**
* @type {Map<string, string>}
*/
private functionParams: Map <string, string> = new Map <string, string> ();
/**
* @param functionNode
*/
public obfuscateNode (functionNode: IFunctionNode): void {
this.replaceFunctionParams(functionNode);
this.replaceFunctionParamsInBody(functionNode);
}
/**
* @param functionNode
*/
private replaceFunctionParams (functionNode: IFunctionNode): void {
functionNode.params.forEach((paramsNode: INode) => {
estraverse.replace(paramsNode, {
leave: (node: INode): any => {
if (NodeUtils.isIdentifierNode(node) && !this.isReservedName(node.name)) {
this.functionParams.set(node.name, Utils.getRandomVariableName());
node.name = this.functionParams.get(node.name);
return;
}
return estraverse.VisitorOption.Skip;
}
});
});
}
/**
* @param functionNode
*/
private replaceFunctionParamsInBody (functionNode: IFunctionNode): void {
estraverse.replace(functionNode.body, {
leave: (node: INode, parentNode: INode): any => {
this.replaceNodeIdentifierByNewValue(node, parentNode, this.functionParams);
}
});
}
}