flow like the river

VISUALIZACION/node_modules/safer-eval/lib/browser.js

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+/**
+* @copyright 2017 Commenthol
+* @license MIT
+*/
+'use strict';
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+var _require = require('./common'),
+    createContext = _require.createContext,
+    allow = _require.allow;
+/**
+* reuse saferEval context
+* @class
+* @example
+* const {SaferEval} = require('safer-eval')
+* const safer = new SaferEval()
+* let res1 = safer.runInContext('new Date('1970-01-01')')
+* let res2 = safer.runInContext('new Date('1970-07-01')')
+*/
+
+
+var SaferEval =
+/*#__PURE__*/
+function () {
+  /**
+  * @param {Object} [context] - allowed context
+  */
+  function SaferEval(context) {
+    _classCallCheck(this, SaferEval);
+
+    // define disallowed objects in context
+    var __context = createContext(); // apply "allowed" context vars
+
+
+    allow(context, __context);
+    this._context = __context;
+  }
+  /**
+  * @param {String} code - a string containing javascript code
+  * @return {Any} evaluated code
+  */
+
+
+  _createClass(SaferEval, [{
+    key: "runInContext",
+    value: function runInContext(code) {
+      if (typeof code !== 'string') {
+        throw new TypeError('not a string');
+      }
+
+      var __context = this._context;
+      var src = 'this.constructor.constructor = function () {};\n'; // set local scope vars from each context property
+
+      Object.keys(__context).forEach(function (key) {
+        src += 'var ' + key + ' = __context[\'' + key + '\'];\n';
+      });
+      src += 'return ' + code + ';\n';
+      return Function('__context', src).call(null, __context); // eslint-disable-line
+    }
+  }]);
+
+  return SaferEval;
+}();
+/**
+* A safer approach for eval. (Browser)
+*
+* This might not be as safe as the nodeJs version as there is no real sandboxing
+* available in the browser.
+*
+* **Warning: This function might be harmful - so you are warned!**
+*
+* `context` allows the definition of passed in Objects into the sandbox.
+* Take care, injected `code` can overwrite those passed context props!
+* Check the tests under "harmful context"!
+*
+* @static
+* @throws Error
+* @param {String} code - a string containing javascript code
+* @param {Object} [context] - define globals, properties for evaluation context
+* @param {Object} [opts] - options
+* @param {Object} [opts.freeze=true] - freeze all native objects
+* @return {Any} evaluated code
+* @example
+* var code = `{d: new Date('1970-01-01'), b: function () { return navigator.userAgent }`
+* var res = saferEval(code, {navigator: window.navigator})
+* // => toString.call(res.d) = '[object Date]'
+* // => toString.call(res.b) = '[object Function]'
+*/
+
+
+function saferEval(code, context) {
+  var opts = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
+  return new SaferEval(context).runInContext(code);
+}
+
+module.exports = saferEval;
+module.exports.SaferEval = SaferEval;

VISUALIZACION/node_modules/safer-eval/lib/common.js

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+'use strict';
+
+var clones = require('clones');
+
+var hasWindow = typeof window !== 'undefined';
+exports.hasWindow = hasWindow;
+var hasGlobal = typeof global !== 'undefined';
+exports.hasGlobal = hasGlobal;
+var FN_NOOP = 'function () {}';
+var NON_IDENTIFIER = /^\d|-|^(break|case|catch|continue|debugger|default|delete|do|else|finally|for|function|if|in|instanceof|new|return|switch|this|throw|try|typeof|var|void|while|with|class|const|enum|export|extends|import|super|implements|interface|let|package|private|protected|public|static|yield|null|true|false)$/;
+
+var isIdentifier = function isIdentifier(key) {
+  return !NON_IDENTIFIER.test(key);
+};
+
+exports.isIdentifier = isIdentifier;
+/**
+* create a fresh context where nearly nothing is allowed
+* @private
+*/
+
+exports.createContext = function () {
+  // protection might not be complete!
+  var context = {
+    // disallowed
+    global: undefined,
+    process: undefined,
+    module: undefined,
+    require: undefined,
+    document: undefined,
+    window: undefined,
+    Window: undefined,
+    // no evil...
+    eval: undefined,
+    Function: undefined
+  };
+
+  var fillContext = function fillContext(root) {
+    Object.keys(root).forEach(function (key) {
+      if (isIdentifier(key)) {
+        context[key] = undefined;
+      }
+    });
+  }; // locally define all potential global vars
+
+
+  if (hasGlobal) {
+    fillContext(global);
+    cloneFunctions(context);
+    context.Buffer = _protect('Buffer');
+    context.console = clones(console, console); // console needs special treatment
+
+    context.console.constructor.constructor = FN_NOOP;
+  }
+
+  if (hasWindow) {
+    fillContext(window, true);
+    cloneFunctions(context);
+    protectBuiltInObjects(context);
+    context.console = clones(console, console); // console needs special treatment
+
+    try {
+      context.Object.constructor.constructor = FN_NOOP;
+    } catch (e) {}
+  }
+
+  return context;
+};
+/**
+* Apply allowed context properties
+* @private
+*/
+
+
+exports.allow = function (context, newContext) {
+  Object.keys(context || {}).forEach(function (key) {
+    if (isIdentifier(key)) {
+      newContext[key] = context[key]; // this is harmful - objects can be overwritten
+    }
+  });
+};
+/**
+* clone global functions
+* @private
+*/
+
+
+function cloneFunctions(context) {
+  ;
+  ['clearImmediate', 'clearInterval', 'clearTimeout'].forEach(function (str) {
+    try {
+      var fn = new Function("return ".concat(str))(); // eslint-disable-line no-new-func
+
+      context[str] = fn ? function () {
+        return fn.apply(null, [].slice.call(arguments));
+      } : undefined;
+    } catch (e) {}
+  });
+  ['setImmediate', 'setInterval', 'setTimeout'].forEach(function (str) {
+    try {
+      var fn = new Function("return ".concat(str))(); // eslint-disable-line no-new-func
+
+      context[str] = fn ? function (f) {
+        if (typeof f === 'function') {
+          return fn.apply(null, [].slice.call(arguments));
+        } else {
+          throw new Error(str + ' requires function as argument');
+        }
+      } : undefined;
+    } catch (e) {}
+  });
+}
+/**
+* wraps up build-in objects using a cloned copy
+* protect object against overwriting
+* @private
+*/
+
+
+function protectBuiltInObjects(context) {
+  ;
+  ['Object', 'Boolean', 'Symbol', 'Error', 'EvalError', 'InternalError', 'RangeError', 'ReferenceError', 'SyntaxError', 'TypeError', 'URIError', 'Number', 'Math', 'Date', 'String', 'RegExp', 'Array', 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array', 'Map', 'Set', 'WeakMap', 'WeakSet', 'ArrayBuffer', 'SharedArrayBuffer', 'Atomics', 'DataView', 'JSON', 'Promise', 'Generator', 'GeneratorFunction', 'Reflect', 'Proxy', 'Intl', 'Buffer'].forEach(function (str) {
+    try {
+      context[str] = _protect(str);
+      new context[str](); // eslint-disable-line no-new
+    } catch (e) {}
+  });
+}
+/**
+* @private
+*/
+
+
+function _protect(str) {
+  try {
+    var type = new Function("return ".concat(str))(); // eslint-disable-line no-new-func
+
+    return type ? clones.classes(type) : undefined;
+  } catch (e) {}
+}

VISUALIZACION/node_modules/safer-eval/lib/index.js

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+/**
+* @copyright 2017 Commenthol
+* @license MIT
+*/
+'use strict';
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+var vm = require('vm');
+
+var _require = require('./common'),
+    createContext = _require.createContext,
+    allow = _require.allow;
+/**
+* reuse saferEval context
+* @class
+* @example
+* const {SaferEval} = require('safer-eval')
+* const safer = new SaferEval()
+* let res1 = safer.runInContext('new Date('1970-01-01')')
+* let res2 = safer.runInContext('new Date('1970-07-01')')
+*/
+
+
+var SaferEval =
+/*#__PURE__*/
+function () {
+  /**
+  * @param {Object} [context] - allowed context
+  * @param {Object} [options] - options for `vm.runInContext`
+  */
+  function SaferEval(context, options) {
+    _classCallCheck(this, SaferEval);
+
+    // define disallowed objects in context
+    var __context = createContext(); // apply "allowed" context vars
+
+
+    allow(context, __context);
+    this._context = vm.createContext(__context);
+    this._options = options;
+  }
+  /**
+  * @param {String} code - a string containing javascript code
+  * @return {Any} evaluated code
+  */
+
+
+  _createClass(SaferEval, [{
+    key: "runInContext",
+    value: function runInContext(code) {
+      if (typeof code !== 'string') {
+        throw new TypeError('not a string');
+      }
+
+      var src = '(function () {"use strict";\n';
+      src += 'Object.constructor = function () {};\n';
+      src += 'return ' + code + ';\n';
+      src += '})()';
+      return vm.runInContext(src, this._context, this._options);
+    }
+  }]);
+
+  return SaferEval;
+}();
+/**
+* A safer approach for eval. (node)
+*
+* In node the `vm` module is used to sandbox the evaluation of `code`.
+*
+* `context` allows the definition of passed in Objects into the sandbox.
+* Take care, injected `code` can overwrite those passed context props!
+* Check the tests under "harmful context"!
+*
+* @static
+* @throws Error
+* @param {String} code - a string containing javascript code
+* @param {Object} [context] - define globals, properties for evaluation context
+* @return {Any} evaluated code
+* @example
+* var code = `{d: new Date('1970-01-01'), b: new Buffer('data')}`
+* var res = saferEval(code, {Buffer: Buffer})
+* // => toString.call(res.d) = '[object Date]'
+* // => toString.call(res.b) = '[object Buffer]'
+*/
+
+
+function saferEval(code, context) {
+  'use strict';
+
+  return new SaferEval(context).runInContext(code);
+}
+
+module.exports = saferEval;
+module.exports.SaferEval = SaferEval;