Created
October 6, 2012 19:09
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Evaluate JavaScript code in a configurable Sandbox (no Iframes here)
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Frameless JS-Sandbox</title> | |
| <style> | |
| textarea, | |
| button { | |
| float:left; | |
| } | |
| textarea { | |
| font-size: 2em; | |
| } | |
| button { | |
| padding: 2em; | |
| line-height: .2em; | |
| font-size: 2.9em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <form id="the_form" action="#"> | |
| <!-- paste your code to test in here --> | |
| <textarea id="the_script" rows="5" cols="30">eval("alert(1);");</textarea> | |
| <button type="submit">Evaluate</button> | |
| </form> | |
| <script src="SandBox.js"></script> | |
| <script> | |
| SandBox.init('the_form', 'the_script', { | |
| 'window': { | |
| 'alert': console.log.bind(console), // your | |
| 'Function': console.warn.bind(console), // callbacks | |
| 'eval': console.warn.bind(console), // here | |
| } | |
| }); | |
| </script> | |
| </body></html> |
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| var SandBox = (function (realCtx) { | |
| var get = realCtx.document.getElementById.bind(realCtx.document), | |
| _evil = eval; | |
| return { | |
| init: function (form, script, ctx) { | |
| this._form = get(form); | |
| this._script = get(script); | |
| this.fakeCtx = ctx; | |
| this._form.onsubmit = SandBox.evaluate; | |
| window.onerror = function (msg, file, line) { | |
| // handle error here | |
| if (msg.indexOf("'eval' of null")) { | |
| msg = 'function.apply() or function.call() with null'; | |
| // check for this file | |
| console.warn(msg); | |
| // suppress error | |
| } | |
| }; | |
| }, | |
| evaluate: function(e) { | |
| var run = function (ctx, script) { | |
| for (p in ctx.window) { | |
| ctx[p] = ctx.window[p]; | |
| } | |
| _evil("with (SandBox.fakeCtx) { (function () { 'use strict'; " + script + "})(); }"); | |
| }; | |
| run.call({}, SandBox.fakeCtx, SandBox._script.value); | |
| e.preventDefault(); | |
| } | |
| }; | |
| })(window); |
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