Code coverage report for src/node-obfuscators/MemberExpressionObfuscator.ts

# All files / src/node-obfuscators MemberExpressionObfuscator.ts

100% Statements 22/22
100% Branches 10/10
100% Functions 1/1
100% Lines 22/22

    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
    831x
    1x

    1x

    1x
    1x
    1x

    1x

    31646x

    31654x
    5097x

    5097x

    26557x
    26553x
    1573x

    24980x
    24980x

    24980x
    24980x

    24980x

    24980x

    5097x
    4077x

     import * as escodegen from 'escodegen';
    import * as estraverse from 'estraverse';
    import * as ESTree from 'estree';

    import { NodeType } from '../enums/NodeType';

    import { AbstractNodeObfuscator } from './AbstractNodeObfuscator';
    import { Node } from '../node/Node';
    import { StringLiteralReplacer } from './replacers/StringLiteralReplacer';

    export class MemberExpressionObfuscator extends AbstractNodeObfuscator {
        /**
         * @param memberExpressionNode
         */
        public obfuscateNode (memberExpressionNode: ESTree.MemberExpression): void {
            estraverse.replace(memberExpressionNode.property, {
                enter: (node: ESTree.Node, parentNode: ESTree.Node): any => {
                    if (Node.isLiteralNode(node)) {
                        this.obfuscateLiteralProperty(node);

                        return;
                    }

                    if (Node.isIdentifierNode(node)) {
                        if (memberExpressionNode.computed) {
                            return;
                        }

                        memberExpressionNode.computed = true;
                        this.obfuscateIdentifierProperty(node);
                    }
                }
            });
        }

        /**
         * replaces:
         *     object.identifier = 1;
         *
         * on:
         *     object[_0x23d45[25]] = 1;
         *
         * and skip:
         *     object[identifier] = 1;
         *
         * @param node
         */
        private obfuscateIdentifierProperty (node: ESTree.Identifier): void {
            let nodeValue: string = node.name,
                literalNode: ESTree.Literal = {
                    raw: `'${nodeValue}'`,
                    'x-verbatim-property': {
                        content : new StringLiteralReplacer(this.nodes, this.options).replace(nodeValue),
                        precedence: escodegen.Precedence.Primary
                    },
                    type: NodeType.Literal,
                    value: nodeValue
                };

            delete node.name;

            Object.assign(node, literalNode);
        }

        /**
         * replaces:
         *     object['literal'] = 1;
         *
         * on:
         *     object[_0x23d45[25]] = 1;
         *
         * @param node
         */
        private obfuscateLiteralProperty (node: ESTree.Literal): void {
            if (typeof node.value === 'string' && !node['x-verbatim-property']) {
                node['x-verbatim-property'] = {
                    content : new StringLiteralReplacer(this.nodes, this.options).replace(node.value),
                    precedence: escodegen.Precedence.Primary
                };
            }
        }
    }