99 lines
No EOL
3 KiB
JavaScript
Executable file
99 lines
No EOL
3 KiB
JavaScript
Executable file
/**
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* @copyright 2017 Commenthol
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* @license MIT
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*/
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'use strict';
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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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); } }
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function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
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var vm = require('vm');
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var _require = require('./common'),
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createContext = _require.createContext,
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allow = _require.allow;
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/**
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* reuse saferEval context
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* @class
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* @example
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* const {SaferEval} = require('safer-eval')
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* const safer = new SaferEval()
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* let res1 = safer.runInContext('new Date('1970-01-01')')
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* let res2 = safer.runInContext('new Date('1970-07-01')')
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*/
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var SaferEval =
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/*#__PURE__*/
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function () {
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/**
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* @param {Object} [context] - allowed context
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* @param {Object} [options] - options for `vm.runInContext`
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*/
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function SaferEval(context, options) {
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_classCallCheck(this, SaferEval);
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// define disallowed objects in context
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var __context = createContext(); // apply "allowed" context vars
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allow(context, __context);
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this._context = vm.createContext(__context);
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this._options = options;
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}
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/**
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* @param {String} code - a string containing javascript code
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* @return {Any} evaluated code
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*/
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_createClass(SaferEval, [{
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key: "runInContext",
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value: function runInContext(code) {
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if (typeof code !== 'string') {
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throw new TypeError('not a string');
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}
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var src = '(function () {"use strict";\n';
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src += 'Object.constructor = function () {};\n';
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src += 'return ' + code + ';\n';
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src += '})()';
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return vm.runInContext(src, this._context, this._options);
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}
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}]);
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return SaferEval;
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}();
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/**
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* A safer approach for eval. (node)
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*
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* In node the `vm` module is used to sandbox the evaluation of `code`.
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*
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* `context` allows the definition of passed in Objects into the sandbox.
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* Take care, injected `code` can overwrite those passed context props!
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* Check the tests under "harmful context"!
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*
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* @static
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* @throws Error
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* @param {String} code - a string containing javascript code
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* @param {Object} [context] - define globals, properties for evaluation context
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* @return {Any} evaluated code
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* @example
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* var code = `{d: new Date('1970-01-01'), b: new Buffer('data')}`
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* var res = saferEval(code, {Buffer: Buffer})
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* // => toString.call(res.d) = '[object Date]'
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* // => toString.call(res.b) = '[object Buffer]'
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*/
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function saferEval(code, context) {
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'use strict';
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return new SaferEval(context).runInContext(code);
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}
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module.exports = saferEval;
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module.exports.SaferEval = SaferEval; |