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POSecure spreadsheet evaluation using JavaScript. Is it possible?
 

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    <p>I was thinking about creating spreadsheets using JSON and JavaScript. This is actually rather a theoretical question about JavaScript.</p> <p>In some cases, it would be a lot more useful, when you could generate a whole column using a single function. Like in this example:</p> <pre><code>{ "type": "jsheet", "version": "1", "author": "John Doe", "title": "Example Spreadsheet", "groups": [ { "name": "Document Information", "columns": [ { "name": "Title", "rows": [ "_.title" ] }, { "name": "Author", "rows": [ "_.author" ] } ] } { "name": "Numbers 1-10", "columns": [ { "name": "Even numbers", "rows": "_.range(1,10).evens()" }, { "name": "Odd numbers", "rows": "_.range(1,10).odds()" } ] } ] } </code></pre> <p>This seems perfectly ok, when you work only with code from trusted source and only on your computer. But think about a cloud service like Google Drive. If users paste insecure code or open insecure spreadsheets, they can run into danger. For example, a script could manipulate the DOM, even could get access to cookies, perform requests and so on. Is there a way to securely prevent this from happening, without implementing a custom JavaScript parser?</p> <p>EDIT on Kenneth's answer: Of course I'm not planning to use <code>eval()</code> to parse the document itself. I'm only thinking about using <code>eval()</code>, or functions defined in the document to evaluate expressions. Think about the possibility of specifying a whole column using this single line of script: <code>_.range(1,10).evens()</code> or <code>_.range(10,200).filter(isprime)</code>. Where <code>_</code> is an object which has methods that return another objects, which have similar methods. Like the chain in jQuery and d3.</p>
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