All files / src/node-obfuscators VariableDeclarationObfuscator.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
84
85
86
87
1x
 
 
 
 
 
 
 
1x
 
1x
1x
1x
1x
 
 
 
 
 
 
 
 
 
 
 
1x
 
 
 
 
 
 
 
 
 
 
28109x
 
28109x
 
 
 
 
 
 
 
28109x
 
 
28109x
1579x
 
 
26530x
 
 
 
26530x
26530x
 
 
 
 
 
 
26530x
 
30596x
30596x
 
 
 
 
 
 
 
 
26530x
 
3324537x
796658x
 
 
 
 
 
 
import * as estraverse from 'estraverse';
import * as ESTree from 'estree';
 
import { TNodeWithBlockStatement } from '../types/TNodeWithBlockStatement';
 
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:
 *     var variable = 1;
 *     variable++;
 *
 * on:
 *     var _0x12d45f = 1;
 *     _0x12d45f++;
 *
 */
export class VariableDeclarationObfuscator 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 variableDeclarationNode
     * @param parentNode
     */
    public obfuscateNode (variableDeclarationNode: ESTree.VariableDeclaration, parentNode: ESTree.Node): void {
        const blockScopeOfVariableDeclarationNode: TNodeWithBlockStatement = NodeUtils
            .getBlockScopeOfNode(variableDeclarationNode);
 
        if (blockScopeOfVariableDeclarationNode.type === NodeType.Program) {
            return;
        }
 
        const scopeNode: ESTree.Node = variableDeclarationNode.kind === 'var'
            ? blockScopeOfVariableDeclarationNode
            : parentNode;
 
        this.storeVariableNames(variableDeclarationNode);
        this.replaceVariableNames(scopeNode);
    }
 
    /**
     * @param variableDeclarationNode
     */
    private storeVariableNames (variableDeclarationNode: ESTree.VariableDeclaration): void {
        variableDeclarationNode.declarations
            .forEach((declarationNode: ESTree.VariableDeclarator) => {
                NodeUtils.typedReplace(declarationNode.id, NodeType.Identifier, {
                    enter: (node: ESTree.Identifier) => this.identifierReplacer.storeNames(node.name)
                });
            });
    }
 
    /**
     * @param scopeNode
     */
    private replaceVariableNames (scopeNode: ESTree.Node): void {
        estraverse.replace(scopeNode, {
            enter: (node: ESTree.Node, parentNode: ESTree.Node): any => {
                if (!node.obfuscated && Node.isReplaceableIdentifierNode(node, parentNode)) {
                    node.name = this.identifierReplacer.replace(node.name);
                }
            }
        });
    }
}