Google Docs API - Spreadsheets which are Form Responses - forms

Question

So, I'm using the Google Docs API to extract spreadsheets programmatically.
However, I'm only interested in spreadsheets which are live feeds from form responses (survey responses). Is there a way of detecting this? So far the only approach I have is that the spreadsheet has a 'Form Responses 1' tab, which is quite a long way into the process; ideally I'd like to know before I download the file.
I'd be overjoyed by solutions which start with the form and tell you the relevant spreadsheet; ones which verify if a spreadsheet is a form's output are okay; knowing it's impossible would be helpful.

Answer 1

It is possible to get a list of the worksheets by using the Spreadsheets API.
Here is a link to the relevant documentation.
https://developers.google.com/google-apps/spreadsheets/#retrieving_information_about_worksheets

Answer 2

The only way I know this is possible is by using Apps Script, which is Google Apps's scripting language based on Javascript.
You can use Form.getDestinationId() to find the target spreadsheet, like in this example :
function myFunction() {
var form = FormApp.openById('1af5Ur_7IPHOXxdyqVXFF4tFA4WHx6PLf9uL56iPLMgI');
Logger.log(form.getDestinationId())
}
More info about Apps Script's Form capabilities here.
Note that Apps Script has very limited integration capabilities, so if you're trying to build an integrated webapp it might get complicated (but not impossible).