See if google user is online

I'm currently trying to create a rails app that checks if a google user is online or not but I'm not even sure where to start.

Should I use the google plus API or gmail api to retrieve the online status of a user or is there another alternative or example I can use as reference preferably in ruby or javascript?

Thanks in advance


Neither of those apis give you online status.
in fact there isnt at the moment a google api to tell you this, thats why you cant find it.

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