Thanks a lot everybody for the contributions to this discussion!
Your recommendations were all useful to better understanding the plugin and finally realise a prototype against 10Duke.
I have a bug with facebook integration, I don't understand what i miss with this plugin, the google auth was done in 30 minutes
I have the flowing error
Blocked URL: The forwarding failed because the redirected URI is not approved in the OAuth Client settings of the application.
url in config.json :
Any idear ?