Code coverage report for src/JavaScriptObfuscatorInternal.ts

# All files / src JavaScriptObfuscatorInternal.ts

100% Statements 23/23
100% Branches 4/4
100% Functions 1/1
100% Lines 22/22

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     import { injectable, inject } from 'inversify';
    import { ServiceIdentifiers } from './container/ServiceIdentifiers';

    import * as esprima from 'esprima';
    import * as escodegen from 'escodegen';
    import * as ESTree from 'estree';

    import { IGeneratorOutput } from './interfaces/IGeneratorOutput';
    import { IJavaScriptObfuscator } from './interfaces/IJavaScriptObfsucator';
    import { IObfuscationResult } from './interfaces/IObfuscationResult';
    import { IObfuscator } from './interfaces/IObfuscator';
    import { IOptions } from './interfaces/options/IOptions';
    import { ISourceMapCorrector } from './interfaces/ISourceMapCorrector';

    @injectable()
    export class JavaScriptObfuscatorInternal implements IJavaScriptObfuscator {
        /**
         * @type {GenerateOptions}
         */
        private static readonly escodegenParams: escodegen.GenerateOptions = {
            verbatim: 'x-verbatim-property',
            sourceMapWithCode: true
        };

        /**
         * @type {IObfuscator}
         */
        private readonly obfuscator: IObfuscator;

        /**
         * @type {IOptions}
         */
        private readonly options: IOptions;

        /**
         * @type {ISourceMapCorrector}
         */
        private readonly sourceMapCorrector: ISourceMapCorrector;

        /**
         * @param obfuscator
         * @param sourceMapCorrector
         * @param options
         */
        constructor (
            @inject(ServiceIdentifiers.IObfuscator) obfuscator: IObfuscator,
            @inject(ServiceIdentifiers.ISourceMapCorrector) sourceMapCorrector: ISourceMapCorrector,
            @inject(ServiceIdentifiers.IOptions) options: IOptions
        ) {
            this.obfuscator = obfuscator;
            this.sourceMapCorrector = sourceMapCorrector;
            this.options = options;
        }

        /**
         * @param sourceCode
         * @returns {IObfuscationResult}
         */
        public obfuscate (sourceCode: string): IObfuscationResult {
            // parse AST tree
            const astTree: ESTree.Program = esprima.parse(sourceCode, { loc: this.options.sourceMap });

            // obfuscate AST tree
            const obfuscatedAstTree: ESTree.Program = this.obfuscator.obfuscateAstTree(astTree);

            // generate code
            const generatorOutput: IGeneratorOutput = this.generateCode(sourceCode, obfuscatedAstTree);

            return this.getObfuscationResult(generatorOutput);
        }

        /**
         * @param sourceCode
         * @param astTree
         */
        private generateCode (sourceCode: string, astTree: ESTree.Program): IGeneratorOutput {
            const escodegenParams: escodegen.GenerateOptions = {
                ...JavaScriptObfuscatorInternal.escodegenParams
            };

            if (this.options.sourceMap) {
                escodegenParams.sourceMap = 'sourceMap';
                escodegenParams.sourceContent = sourceCode;
            }

            escodegenParams.format = {
                compact: this.options.compact
            };

            const generatorOutput: IGeneratorOutput = escodegen.generate(astTree, escodegenParams);

            generatorOutput.map = generatorOutput.map ? generatorOutput.map.toString() : '';

            return generatorOutput;
        }

        /**
         * @param generatorOutput
         * @returns {IObfuscationResult}
         */
        private getObfuscationResult (generatorOutput: IGeneratorOutput): IObfuscationResult {
            return this.sourceMapCorrector.correct(
                generatorOutput.code,
                generatorOutput.map
            );
        }
    }