Code coverage report for src/node-obfuscators/FunctionTransformer.ts

# All files / src/node-obfuscators FunctionTransformer.ts

100% Statements 23/23
100% Branches 4/4
100% Functions 4/4
100% Lines 23/23

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     import * as estraverse from 'estraverse';
    import * as ESTree from 'estree';

    import { ICustomNode } from '../interfaces/custom-nodes/ICustomNode';
    import { IOptions } from '../interfaces/IOptions';

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

    import { AbstractNodeObfuscator } from './AbstractNodeObfuscator';
    import { IdentifierReplacer } from './replacers/IdentifierReplacer';
    import { Node } from '../node/Node';
    import { NodeUtils } from '../node/NodeUtils';

    /**
     * replaces:
     *     function foo (argument1) { return argument1; };
     *
     * on:
     *     function foo (_0x12d45f) { return _0x12d45f; };
     *
     */
    export class FunctionObfuscator extends AbstractNodeObfuscator {
        /**
         * @type {IdentifierReplacer}
         */
        private identifierReplacer: IdentifierReplacer;

        /**
         * @param nodes
         * @param options
         */
        constructor(nodes: Map <string, ICustomNode>, options: IOptions) {
            super(nodes, options);

            this.identifierReplacer = new IdentifierReplacer(this.nodes, this.options);
        }

        /**
         * @param functionNode
         */
        public obfuscateNode (functionNode: ESTree.Function): void {
            this.storeFunctionParams(functionNode);
            this.replaceFunctionParams(functionNode);
        }

        /**
         * @param functionNode
         */
        private storeFunctionParams (functionNode: ESTree.Function): void {
            functionNode.params
                .forEach((paramsNode: ESTree.Node) => {
                    NodeUtils.typedReplace(paramsNode, NodeType.Identifier, {
                        enter: (node: ESTree.Identifier) => this.identifierReplacer.storeNames(node.name)
                    });
                });
        }

        /**
         * @param functionNode
         */
        private replaceFunctionParams (functionNode: ESTree.Function): void {
            let replaceVisitor: estraverse.Visitor = {
                enter: (node: ESTree.Node, parentNode: ESTree.Node): any => {
                    if (Node.isReplaceableIdentifierNode(node, parentNode)) {
                        const newNodeName: string = this.identifierReplacer.replace(node.name);

                        if (node.name !== newNodeName) {
                            node.name = newNodeName;
                            node.obfuscated = true;
                        }
                    }
                }
            };

            functionNode.params
                .forEach((paramsNode: ESTree.Node) => {
                    estraverse.replace(paramsNode, replaceVisitor);
                });

            estraverse.replace(functionNode.body, replaceVisitor);
        }
    }