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| import { injectable, inject } from 'inversify';
import { ServiceIdentifiers } from './container/ServiceIdentifiers';
import * as estraverse from 'estraverse';
import * as ESTree from 'estree';
import { TNodeTransformersFactory } from './types/container/TNodeTransformersFactory';
import { TVisitorDirection } from './types/TVisitorDirection';
import { ICustomNodeGroup } from './interfaces/custom-nodes/ICustomNodeGroup';
import { IObfuscationEventEmitter } from './interfaces/event-emitters/IObfuscationEventEmitter';
import { IObfuscator } from './interfaces/IObfuscator';
import { IOptions } from './interfaces/options/IOptions';
import { INodeTransformer } from './interfaces/node-transformers/INodeTransformer';
import { IStackTraceAnalyzer } from './interfaces/stack-trace-analyzer/IStackTraceAnalyzer';
import { IStackTraceData } from './interfaces/stack-trace-analyzer/IStackTraceData';
import { IStorage } from './interfaces/storages/IStorage';
import { NodeTransformers } from './enums/container/NodeTransformers';
import { NodeType } from './enums/NodeType';
import { ObfuscationEvents } from './enums/ObfuscationEvents';
import { VisitorDirection } from './enums/VisitorDirection';
import { Node } from './node/Node';
import { NodeUtils } from './node/NodeUtils';
@injectable()
export class Obfuscator implements IObfuscator {
/**
* @type {Map<string, NodeTransformers[]>}
*/
private static readonly nodeControlFlowTransformersMap: Map <string, NodeTransformers[]> = new Map([
[NodeType.BlockStatement, [NodeTransformers.BlockStatementControlFlowTransformer]],
[NodeType.FunctionDeclaration, [NodeTransformers.FunctionControlFlowTransformer]],
[NodeType.FunctionExpression, [NodeTransformers.FunctionControlFlowTransformer]]
]);
/**
* @type {Map<string, NodeTransformers[]>}
*/
private static readonly nodeObfuscatorsMap: Map <string, NodeTransformers[]> = new Map([
[NodeType.ArrowFunctionExpression, [NodeTransformers.FunctionTransformer]],
[NodeType.ClassDeclaration, [NodeTransformers.FunctionDeclarationTransformer]],
[NodeType.CatchClause, [NodeTransformers.CatchClauseTransformer]],
[NodeType.FunctionDeclaration, [
NodeTransformers.FunctionDeclarationTransformer,
NodeTransformers.FunctionTransformer
]],
[NodeType.FunctionExpression, [NodeTransformers.FunctionTransformer]],
[NodeType.MemberExpression, [NodeTransformers.MemberExpressionTransformer]],
[NodeType.MethodDefinition, [NodeTransformers.MethodDefinitionTransformer]],
[NodeType.ObjectExpression, [NodeTransformers.ObjectExpressionTransformer]],
[NodeType.VariableDeclaration, [NodeTransformers.VariableDeclarationTransformer]],
[NodeType.LabeledStatement, [NodeTransformers.LabeledStatementTransformer]],
[NodeType.TemplateLiteral, [NodeTransformers.TemplateLiteralTransformer]],
[NodeType.Literal, [NodeTransformers.LiteralTransformer]] // should be latest in the chain of obfuscators
]);
/**
* @type {IStorage<ICustomNodeGroup>}
*/
private readonly customNodeGroupStorage: IStorage<ICustomNodeGroup>;
/**
* @type {TNodeTransformersFactory}
*/
private readonly nodeTransformersFactory: TNodeTransformersFactory;
/**
* @type {IObfuscationEventEmitter}
*/
private readonly obfuscationEventEmitter: IObfuscationEventEmitter;
/**
* @type {IOptions}
*/
private readonly options: IOptions;
/**
* @type {IStackTraceAnalyzer}
*/
private readonly stackTraceAnalyzer: IStackTraceAnalyzer;
/**
* @param stackTraceAnalyzer
* @param obfuscationEventEmitter
* @param customNodeGroupStorage
* @param nodeTransformersFactory
* @param options
*/
constructor (
@inject(ServiceIdentifiers.IStackTraceAnalyzer) stackTraceAnalyzer: IStackTraceAnalyzer,
@inject(ServiceIdentifiers.IObfuscationEventEmitter) obfuscationEventEmitter: IObfuscationEventEmitter,
@inject(ServiceIdentifiers.TCustomNodeGroupStorage) customNodeGroupStorage: IStorage<ICustomNodeGroup>,
@inject(ServiceIdentifiers.Factory__INodeTransformer) nodeTransformersFactory: TNodeTransformersFactory,
@inject(ServiceIdentifiers.IOptions) options: IOptions
) {
this.stackTraceAnalyzer = stackTraceAnalyzer;
this.obfuscationEventEmitter = obfuscationEventEmitter;
this.customNodeGroupStorage = customNodeGroupStorage;
this.nodeTransformersFactory = nodeTransformersFactory;
this.options = options;
}
/**
* @param astTree
* @returns {ESTree.Program}
*/
public obfuscateAstTree (astTree: ESTree.Program): ESTree.Program {
if (Node.isProgramNode(astTree) && !astTree.body.length) {
return astTree;
}
astTree = <ESTree.Program>NodeUtils.parentize(astTree);
const stackTraceData: IStackTraceData[] = this.stackTraceAnalyzer.analyze(astTree.body);
// initialize custom node groups and configure custom nodes
this.customNodeGroupStorage
.getStorage()
.forEach((customNodeGroup: ICustomNodeGroup) => {
customNodeGroup.initialize();
this.obfuscationEventEmitter.once(
customNodeGroup.getAppendEvent(),
customNodeGroup.appendCustomNodes.bind(customNodeGroup)
);
});
this.obfuscationEventEmitter.emit(ObfuscationEvents.BeforeObfuscation, astTree, stackTraceData);
// first pass: control flow flattening
if (this.options.controlFlowFlattening) {
astTree = this.transformAstTree(
astTree,
VisitorDirection.leave,
this.nodeTransformersFactory(Obfuscator.nodeControlFlowTransformersMap)
);
}
// second pass: nodes obfuscation
astTree = this.transformAstTree(
astTree,
VisitorDirection.enter,
this.nodeTransformersFactory(Obfuscator.nodeObfuscatorsMap)
);
this.obfuscationEventEmitter.emit(ObfuscationEvents.AfterObfuscation, astTree, stackTraceData);
return astTree;
}
/**
* @param astTree
* @param direction
* @param nodeTransformersConcreteFactory
*/
private transformAstTree (
astTree: ESTree.Program,
direction: TVisitorDirection,
nodeTransformersConcreteFactory: (nodeType: string) => INodeTransformer[]
): ESTree.Program {
estraverse.replace(astTree, {
[direction]: (node: ESTree.Node, parentNode: ESTree.Node): ESTree.Node => {
const nodeTransformers: INodeTransformer[] = nodeTransformersConcreteFactory(node.type);
nodeTransformers.forEach((nodeTransformer: INodeTransformer) => {
node = nodeTransformer.transformNode(node, parentNode);
});
return node;
}
});
return astTree;
}
}
|