javascript-obfuscator/test/functional-tests/node-transformers/node-control-flow-transformers/control-flow-replacers/BinaryExpressionControlFlowReplacer.spec.ts

import { assert } from 'chai';

import { IObfuscationResult } from '../../../../../src/interfaces/IObfuscationResult';

import { NO_CUSTOM_NODES_PRESET } from '../../../../../src/preset-options/NoCustomNodesPreset';

import { readFileAsString } from '../../../../helpers/readFileAsString';

import { JavaScriptObfuscator } from '../../../../../src/JavaScriptObfuscator';

describe('BinaryExpressionControlFlowReplacer', () => {
    describe('replace (binaryExpressionNode: ESTree.BinaryExpression,parentNode: ESTree.Node,controlFlowStorage: IStorage <ICustomNode>)', () => {
        describe('variant #1 - single binary expression', () => {
            const obfuscationResult: IObfuscationResult = JavaScriptObfuscator.obfuscate(
                readFileAsString(
                    './test/fixtures/node-transformers/node-control-flow-transformers/control-flow-replacers/binary-expression-control-flow-replacer-1.js'
                ),
                {
                    ...NO_CUSTOM_NODES_PRESET,
                    controlFlowFlattening: true,
                    controlFlowFlatteningThreshold: 1
                }
            );
            const obfuscatedCode: string = obfuscationResult.getObfuscatedCode();
            const controlFlowStorageCallRegExp: RegExp = /var *_0x([a-z0-9]){4,6} *= *_0x([a-z0-9]){4,6}\['(\\x[a-f0-9]*){3}'\]\(0x1, *0x2\);/;

            it('should replace binary expression node by call to control flow storage node', () => {
                assert.match(obfuscatedCode, controlFlowStorageCallRegExp);
            });
        });

        describe('variant #2 - multiple binary expressions with threshold = 1', () => {
            it('should replace binary expression node by call to control flow storage node', () => {
                const samplesCount: number = 100;
                const expectedValue: number = 0.5;
                const delta: number = 0.08;

                let equalsValue: number = 0;

                for (let i = 0; i < samplesCount; i++) {
                    const obfuscationResult: IObfuscationResult = JavaScriptObfuscator.obfuscate(
                        readFileAsString(
                            './test/fixtures/node-transformers/node-control-flow-transformers/control-flow-replacers/binary-expression-control-flow-replacer-2.js'
                        ),
                        {
                            ...NO_CUSTOM_NODES_PRESET,
                            controlFlowFlattening: true,
                            controlFlowFlatteningThreshold: 1
                        }
                    );
                    const obfuscatedCode: string = obfuscationResult.getObfuscatedCode();
                    const controlFlowStorageCallRegExp1: RegExp = /var *_0x([a-z0-9]){4,6} *= *(_0x([a-z0-9]){4,6}\['(\\x[a-f0-9]*){3}'\])\(0x1, *0x2\);/;
                    const controlFlowStorageCallRegExp2: RegExp = /var *_0x([a-z0-9]){4,6} *= *(_0x([a-z0-9]){4,6}\['(\\x[a-f0-9]*){3}'\])\(0x2, *0x3\);/;

                    const firstMatchArray: RegExpMatchArray | null = obfuscatedCode.match(controlFlowStorageCallRegExp1);
                    const secondMatchArray: RegExpMatchArray | null = obfuscatedCode.match(controlFlowStorageCallRegExp2);

                    const firstMatch: string | undefined = firstMatchArray ? firstMatchArray[2] : undefined;
                    const secondMatch: string | undefined = secondMatchArray ? secondMatchArray[2] : undefined;

                    assert.match(obfuscatedCode, controlFlowStorageCallRegExp1);
                    assert.match(obfuscatedCode, controlFlowStorageCallRegExp2);
                    assert.isOk(firstMatch);
                    assert.isOk(secondMatch);

                    if (firstMatch === secondMatch) {
                        equalsValue++;
                    }
                }

                assert.closeTo(equalsValue / samplesCount, expectedValue, delta);
            });
        });
    });
});