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JavaScriptObfuscator.ts
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227 lines (192 loc) · 7.88 KB
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import { inject, injectable, } from 'inversify';
import { ServiceIdentifiers } from './container/ServiceIdentifiers';
import * as escodegen from 'escodegen-wallaby';
import * as ESTree from 'estree';
import * as packageJson from 'pjson';
import { IGeneratorOutput } from './interfaces/IGeneratorOutput';
import { IJavaScriptObfuscator } from './interfaces/IJavaScriptObfsucator';
import { ILogger } from './interfaces/logger/ILogger';
import { IObfuscationResult } from './interfaces/IObfuscationResult';
import { IOptions } from './interfaces/options/IOptions';
import { IRandomGenerator } from './interfaces/utils/IRandomGenerator';
import { ISourceMapCorrector } from './interfaces/source-map/ISourceMapCorrector';
import { ITransformersRunner } from './interfaces/node-transformers/ITransformersRunner';
import { LoggingMessage } from './enums/logger/LoggingMessage';
import { NodeTransformer } from './enums/node-transformers/NodeTransformer';
import { TransformationStage } from './enums/node-transformers/TransformationStage';
import { EsprimaFacade } from './EsprimaFacade';
import { NodeGuards } from './node/NodeGuards';
@injectable()
export class JavaScriptObfuscator implements IJavaScriptObfuscator {
/**
* @type {GenerateOptions}
*/
private static readonly escodegenParams: escodegen.GenerateOptions = {
comment: true,
verbatim: 'x-verbatim-property',
sourceMapWithCode: true
};
/**
* @type {NodeTransformer[]}
*/
private static readonly transformersList: NodeTransformer[] = [
NodeTransformer.BlockStatementControlFlowTransformer,
NodeTransformer.ClassDeclarationTransformer,
NodeTransformer.CommentsTransformer,
NodeTransformer.CustomNodesTransformer,
NodeTransformer.DeadCodeInjectionTransformer,
NodeTransformer.EvalCallExpressionTransformer,
NodeTransformer.FunctionControlFlowTransformer,
NodeTransformer.CatchClauseTransformer,
NodeTransformer.FunctionDeclarationTransformer,
NodeTransformer.FunctionTransformer,
NodeTransformer.LabeledStatementTransformer,
NodeTransformer.LiteralTransformer,
NodeTransformer.MemberExpressionTransformer,
NodeTransformer.MethodDefinitionTransformer,
NodeTransformer.ObfuscatingGuardsTransformer,
NodeTransformer.ObjectExpressionKeysTransformer,
NodeTransformer.ObjectExpressionTransformer,
NodeTransformer.ParentificationTransformer,
NodeTransformer.TemplateLiteralTransformer,
NodeTransformer.VariableDeclarationTransformer
];
/**
* @type {ILogger}
*/
private readonly logger: ILogger;
/**
* @type {IOptions}
*/
private readonly options: IOptions;
/**
* @type {IRandomGenerator}
*/
private readonly randomGenerator: IRandomGenerator;
/**
* @type {ISourceMapCorrector}
*/
private readonly sourceMapCorrector: ISourceMapCorrector;
/**
* @type {ITransformersRunner}
*/
private readonly transformersRunner: ITransformersRunner;
/**
* @param {ITransformersRunner} transformersRunner
* @param {ISourceMapCorrector} sourceMapCorrector
* @param {IRandomGenerator} randomGenerator
* @param {ILogger} logger
* @param {IOptions} options
*/
constructor (
@inject(ServiceIdentifiers.ITransformersRunner) transformersRunner: ITransformersRunner,
@inject(ServiceIdentifiers.ISourceMapCorrector) sourceMapCorrector: ISourceMapCorrector,
@inject(ServiceIdentifiers.IRandomGenerator) randomGenerator: IRandomGenerator,
@inject(ServiceIdentifiers.ILogger) logger: ILogger,
@inject(ServiceIdentifiers.IOptions) options: IOptions
) {
this.transformersRunner = transformersRunner;
this.sourceMapCorrector = sourceMapCorrector;
this.randomGenerator = randomGenerator;
this.logger = logger;
this.options = options;
}
/**
* @param {string} sourceCode
* @returns {IObfuscationResult}
*/
public obfuscate (sourceCode: string): IObfuscationResult {
const timeStart: number = Date.now();
this.logger.info(LoggingMessage.Version, packageJson.version);
this.logger.info(LoggingMessage.ObfuscationStarted);
this.logger.info(LoggingMessage.RandomGeneratorSeed, this.randomGenerator.getSeed());
// parse AST tree
const astTree: ESTree.Program = this.parseCode(sourceCode);
// obfuscate AST tree
const obfuscatedAstTree: ESTree.Program = this.transformAstTree(astTree);
// generate code
const generatorOutput: IGeneratorOutput = this.generateCode(sourceCode, obfuscatedAstTree);
const obfuscationTime: number = (Date.now() - timeStart) / 1000;
this.logger.success(LoggingMessage.ObfuscationCompleted, obfuscationTime);
return this.getObfuscationResult(generatorOutput);
}
/**
* @param {string} sourceCode
* @returns {Program}
*/
private parseCode (sourceCode: string): ESTree.Program {
return EsprimaFacade.parseScript(sourceCode, {
attachComment: true,
loc: this.options.sourceMap
});
}
/**
* @param {Program} astTree
* @returns {Program}
*/
private transformAstTree (astTree: ESTree.Program): ESTree.Program {
const isEmptyAstTree: boolean = NodeGuards.isProgramNode(astTree)
&& !astTree.body.length
&& !astTree.leadingComments;
if (isEmptyAstTree) {
this.logger.warn(LoggingMessage.EmptySourceCode);
return astTree;
}
astTree = this.runTransformationStage(astTree, TransformationStage.Preparing);
if (this.options.deadCodeInjection) {
astTree = this.runTransformationStage(astTree, TransformationStage.DeadCodeInjection);
}
if (this.options.controlFlowFlattening) {
astTree = this.runTransformationStage(astTree, TransformationStage.ControlFlowFlattening);
}
astTree = this.runTransformationStage(astTree, TransformationStage.Converting);
astTree = this.runTransformationStage(astTree, TransformationStage.Obfuscating);
astTree = this.runTransformationStage(astTree, TransformationStage.Finalizing);
return astTree;
}
/**
* @param {string} sourceCode
* @param {Program} astTree
* @returns {IGeneratorOutput}
*/
private generateCode (sourceCode: string, astTree: ESTree.Program): IGeneratorOutput {
const escodegenParams: escodegen.GenerateOptions = {
...JavaScriptObfuscator.escodegenParams
};
if (this.options.sourceMap) {
escodegenParams.sourceMap = 'sourceMap';
escodegenParams.sourceContent = sourceCode;
}
const generatorOutput: IGeneratorOutput = escodegen.generate(astTree, {
...escodegenParams,
format: {
compact: this.options.compact
}
});
generatorOutput.map = generatorOutput.map ? generatorOutput.map.toString() : '';
return generatorOutput;
}
/**
* @param {IGeneratorOutput} generatorOutput
* @returns {IObfuscationResult}
*/
private getObfuscationResult (generatorOutput: IGeneratorOutput): IObfuscationResult {
return this.sourceMapCorrector.correct(
generatorOutput.code,
generatorOutput.map
);
}
/**
* @param {Program} astTree
* @param {TransformationStage} transformationStage
* @returns {Program}
*/
private runTransformationStage (astTree: ESTree.Program, transformationStage: TransformationStage): ESTree.Program {
this.logger.info(LoggingMessage.TransformationStage, transformationStage);
return this.transformersRunner.transform(
astTree,
JavaScriptObfuscator.transformersList,
transformationStage
);
}
}