search for files with reader permission in Google drive API if email is not a gmail

Question

I'd like to know if it's possible to query files by permission in drive API only if the permission email is a gmail (and obviously an existing account)

$results = $service->files->listFiles()

with

'[email protected]' in readers

doesn't return result

while

'[email protected]' in readers

does

with both addresses present in the permissions array of the files

thanks for any advice, so I don't waste time for something not possible (and I'll have to do it looping all the files in a folder to check for permissions)

Answer 1

Interesting behavior, the query only seems to work if the target email address is associated with a google account.

People can bring their own email and create a google account.

So I can register and share files with my outlook.com account. In this case the query does return results.

If the account is not registered in google.com, then I don't get results. We should report this to google.

But to answer your question, yes it's possible if the account happens to be registered at google.