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

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

100% Statements 20/20
100% Branches 5/5
100% Functions 2/2
100% Lines 19/19

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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 { ICustomNode } from '../../interfaces/custom-nodes/ICustomNode';
    import { IOptions } from '../../interfaces/options/IOptions';
    import { IReplacer } from '../../interfaces/node-transformers/IReplacer';
    import { IStorage } from '../../interfaces/storages/IStorage';

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

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

    /**
     * replaces:
     *     foo () { //... };
     *
     * on:
     *     [_0x9a4e('0x0')] { //... };
     */
    @injectable()
    export class MethodDefinitionObfuscator extends AbstractNodeTransformer {
        /**
         * @type {IReplacer}
         */
        private readonly stringLiteralReplacer: IReplacer;

        /**
         * @type {string[]}
         */
        private static readonly ignoredNames: string[] = ['constructor'];

        /**
         * @param customNodesStorage
         * @param replacersFactory
         * @param options
         */
        constructor(
            @inject(ServiceIdentifiers['IStorage<ICustomNode>']) customNodesStorage: IStorage<ICustomNode>,
            @inject(ServiceIdentifiers['Factory<IReplacer>']) replacersFactory: (replacer: NodeObfuscatorsReplacers) => IReplacer,
            @inject(ServiceIdentifiers.IOptions) options: IOptions
        ) {
            super(customNodesStorage, options);

            this.stringLiteralReplacer = replacersFactory(NodeObfuscatorsReplacers.StringLiteralReplacer);
        }

        /**
         * @param methodDefinitionNode
         * @param parentNode
         */
        public transformNode (methodDefinitionNode: ESTree.MethodDefinition, parentNode: ESTree.Node): void {
            this.replaceMethodName(methodDefinitionNode);
        }

        /**
         * @param methodDefinitionNode
         */
        private replaceMethodName (methodDefinitionNode: ESTree.MethodDefinition): void {
            estraverse.replace(methodDefinitionNode.key, {
                enter: (node: ESTree.Node): any => {
                    if (
                        Node.isIdentifierNode(node) &&
                        !Utils.arrayContains(MethodDefinitionObfuscator.ignoredNames, node.name) &&
                        methodDefinitionNode.computed === false
                    ) {
                        methodDefinitionNode.computed = true;
                        node.name = this.stringLiteralReplacer.replace(node.name);

                        return;
                    }

                    return estraverse.VisitorOption.Skip;
                }
            });
        }
    }