Resize a document to match the content

Hi,

I would like to resize a document to match its content. This should be done by script. For example I have got only 3 elements in the centre of the document. In this case these objects should be moved all together (like a group) to the left top corner of the document and then the document should be resized properly, so no unused "free space margins" will be left. How can I do it? I will use InDesign Server for this job, controlling it by JavaScript.

Thank you for all comments!