This application is distributed WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU AFFERO GENERAL PUBLIC LICENSE for more details.

Your feedback is appreciated.
You are welcome to post to this thread http://forum.owncloud.org/viewtopic.php?f=4&t=4 


Installation:
Upload the gsync directory under the 'apps' directory of your ownCloud.
Navigate to the 'Apps' page in Admin, click the 'Gsync' in the 
application list. Then click the 'Enable' button.


Setup:
1. Manual Sync
a) Navigate to the 'Personal' page.
b) Copy your redirect URI to the clipboard.
c) Navigate to https://code.google.com/apis/console
d) Create a new Web application at the 'API Access' tab.
e) Fill in the 'Client ID' field with the newly created application Client ID.

2. Autosync *experimental*
Current implementation rewrites the changes in contacts that made in
ownCloud if the contact originated from Google.

a) Complete all steps for manual sync and check if it works
b) Paste 'Secret' of your Web application to the respective form
c) Click the 'Request autosync permissions' button
d) Confirm that you want to setup offline access for your Web application.

Autosync only: Please note that it is not possible to reuse one Web application 
to sync the contacts with another ownCloud instance on the same domain. 
Google won't grant proper permissions for the second instance.



Usage:
1. Manual Sync
a) Click the 'Import' button under the 'Google Sync' label.
b) Authorize the app to access your personal data.
c) Check your Contacts.

2. Autosync *experimental*
a) Add to your crontab with desired sync periodicity:
   replacing User, Password and http://domain.tld/path/to/owncloud with actual data:
wget -rnd --auth-no-challenge --http-user=User --http-password=Password -S --spider  'http://domain.tld/path/to/owncloud/?app=gsync&getfile=auto.php'