All files / src/node-obfuscators FunctionTransformer.ts

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
1x
 
 
 
 
 
1x
 
1x
1x
1x
1x
 
 
 
 
 
 
 
 
 
1x
 
 
 
 
 
 
 
 
 
 
17869x
 
17869x
 
 
 
 
 
 
17869x
17869x
 
 
 
 
 
 
17869x
 
12263x
12263x
 
 
 
 
 
 
 
 
17869x
 
945859x
276448x
 
276448x
37772x
37772x
 
 
 
 
 
17869x
 
12263x
 
 
17869x
 
 
 
import * as estraverse from 'estraverse';
import * as ESTree from 'estree';
 
import { ICustomNode } from '../interfaces/custom-nodes/ICustomNode';
import { IOptions } from '../interfaces/IOptions';
 
import { NodeType } from '../enums/NodeType';
 
import { AbstractNodeObfuscator } from './AbstractNodeObfuscator';
import { IdentifierReplacer } from './replacers/IdentifierReplacer';
import { Node } from '../node/Node';
import { NodeUtils } from '../node/NodeUtils';
 
/**
 * replaces:
 *     function foo (argument1) { return argument1; };
 *
 * on:
 *     function foo (_0x12d45f) { return _0x12d45f; };
 *
 */
export class FunctionObfuscator extends AbstractNodeObfuscator {
    /**
     * @type {IdentifierReplacer}
     */
    private identifierReplacer: IdentifierReplacer;
 
    /**
     * @param nodes
     * @param options
     */
    constructor(nodes: Map <string, ICustomNode>, options: IOptions) {
        super(nodes, options);
 
        this.identifierReplacer = new IdentifierReplacer(this.nodes, this.options);
    }
 
    /**
     * @param functionNode
     */
    public obfuscateNode (functionNode: ESTree.Function): void {
        this.storeFunctionParams(functionNode);
        this.replaceFunctionParams(functionNode);
    }
 
    /**
     * @param functionNode
     */
    private storeFunctionParams (functionNode: ESTree.Function): void {
        functionNode.params
            .forEach((paramsNode: ESTree.Node) => {
                NodeUtils.typedReplace(paramsNode, NodeType.Identifier, {
                    enter: (node: ESTree.Identifier) => this.identifierReplacer.storeNames(node.name)
                });
            });
    }
 
    /**
     * @param functionNode
     */
    private replaceFunctionParams (functionNode: ESTree.Function): void {
        let replaceVisitor: estraverse.Visitor = {
            enter: (node: ESTree.Node, parentNode: ESTree.Node): any => {
                if (Node.isReplaceableIdentifierNode(node, parentNode)) {
                    const newNodeName: string = this.identifierReplacer.replace(node.name);
 
                    if (node.name !== newNodeName) {
                        node.name = newNodeName;
                        node.obfuscated = true;
                    }
                }
            }
        };
 
        functionNode.params
            .forEach((paramsNode: ESTree.Node) => {
                estraverse.replace(paramsNode, replaceVisitor);
            });
 
        estraverse.replace(functionNode.body, replaceVisitor);
    }
}