Google Drive API + Gmail API in Java running in App Engine

Hi There! We need to build a simple web app that will do the following: 1 - After a user accessed our web app, it will need to grant access to his Google Drive account and Gmail account. 2 - After we have the user's authorization, we need to search for modified files(or added ones) in the last 24 hours. 3 - After we know the files that have been modified or created in the last 24 hours, we need to notify the user's that have read access in those modifed files(By access I mean has this file shared with). Basically, we have an Google Apps for business account that have a lot of procedure files on it's Google Drive. Those files are shared with several users. We need to notify those users that have read access to a file if those file has been modified. We don't need fancy UI, o anything like that, we just need a eclipse project that can be uploaded to Google App Engine and every 24 hours, it will run to check if there is a file modified and notify the users about this change. The users must receive something like a digest of modified files in the last 24 hours, like: Dear User X, The following files have been modified in the last 24 hours: Folder A\File [login to view URL] Folder X\File [login to view URL] Regards, System. All those files are stored in a single account, that is the account the user must grant access. We need access only to list files and get if it has been modified or created in the last 24 hours, we don't need to read files, change, remove or anything like that. Any doubts just let me know. Thanks.