Code coverage report for src/node-transformers/node-obfuscators/LabeledStatementTransformer.ts

# All files / src/node-transformers/node-obfuscators LabeledStatementTransformer.ts

100% Statements 23/23
100% Branches 2/2
100% Functions 2/2
100% Lines 20/20

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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 { IOptions } from '../../interfaces/options/IOptions';
    import { IObfuscatorReplacer } from '../../interfaces/node-transformers/IObfuscatorReplacer';
    import { IObfuscatorReplacerWithStorage } from '../../interfaces/node-transformers/IObfuscatorReplacerWithStorage';

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

    import { AbstractNodeTransformer } from '../AbstractNodeTransformer';
    import { Node } from '../../node/Node';
    import { NodeUtils } from '../../node/NodeUtils';

    /**
     * replaces:
     *     label: {
     *          for (var i = 0; i < 1000; i++) {
     *              break label;
     *          }
     *     }
     *
     * on:
     *     _0x12d45f: {
     *          for (var i = 0; i < 1000; i++) {
     *              break _0x12d45f;
     *          }
     *     }
     *
     */
    @injectable()
    export class LabeledStatementObfuscator extends AbstractNodeTransformer {
        /**
         * @type {IObfuscatorReplacerWithStorage}
         */
        private readonly identifierReplacer: IObfuscatorReplacerWithStorage;

        /**
         * @param nodeObfuscatorsReplacersFactory
         * @param options
         */
        constructor(
            @inject(ServiceIdentifiers.Factory__IObfuscatorReplacer) nodeObfuscatorsReplacersFactory: (replacer: NodeObfuscatorsReplacers) => IObfuscatorReplacer,
            @inject(ServiceIdentifiers.IOptions) options: IOptions
        ) {
            super(options);

            this.identifierReplacer = <IObfuscatorReplacerWithStorage>nodeObfuscatorsReplacersFactory(NodeObfuscatorsReplacers.IdentifierReplacer);
        }

        /**
         * @param labeledStatementNode
         * @returns {ESTree.Node}
         */
        public transformNode (labeledStatementNode: ESTree.LabeledStatement): ESTree.Node {
            const nodeIdentifier: number = this.nodeIdentifier++;

            this.storeLabeledStatementName(labeledStatementNode, nodeIdentifier);
            this.replaceLabeledStatementName(labeledStatementNode, nodeIdentifier);

            return labeledStatementNode;
        }

        /**
         * @param labeledStatementNode
         * @param nodeIdentifier
         */
        private storeLabeledStatementName (labeledStatementNode: ESTree.LabeledStatement, nodeIdentifier: number): void {
            NodeUtils.typedTraverse(labeledStatementNode.label, NodeType.Identifier, {
                enter: (node: ESTree.Identifier) => this.identifierReplacer.storeNames(node.name, nodeIdentifier)
            });
        }

        /**
         * @param labeledStatementNode
         * @param nodeIdentifier
         */
        private replaceLabeledStatementName (labeledStatementNode: ESTree.LabeledStatement, nodeIdentifier: number): void {
            estraverse.replace(labeledStatementNode, {
                enter: (node: ESTree.Node, parentNode: ESTree.Node): any => {
                    if (Node.isLabelIdentifierNode(node, parentNode)) {
                        node.name = this.identifierReplacer.replace(node.name, nodeIdentifier);
                    }
                }
            });
        }
    }