Doing this all in a webworker might be one way to get security - by sandboxing t...

jcampbell1 · on Nov 14, 2013

Possibly. Web workers are isolated from the DOM, but can still do stuff like import other scripts or do XHR requests, but those would be limited to the same origin.

It seems like that would be somewhat XSS safe since you are just passing strings back and forth.

I really like this idea.

   evalSafeAsync(code,context,callback)

That being said, for a spreadsheet, you need to bite the bullet and parse the formulas. I don't see an easy way to support SUM(A1:A4) using this eval hack.

aboodman · on Nov 14, 2013

Script evaluated in a web worker would still have access to your application's cookies and would be able to interact with the server with the user's credentials. You probably don't want that.