google calendar sync token expire

Question

hi i am trying to sync google calendar with my local calendar

my current setup works like this

i login via google and get my primary calendar events and store locally and i also save the sync token google provide at the last page.

so i have created a channel to watch calendar and it sends me notifications each time there is a change in calendar but what i want is to get the changed data if i send request again it just says token is expired how can i work around this.

i am using ruby on rails and google api gem

thank you

Answer 1

Access tokens expire. You need to save the refresh token after authorization is first granted so that you can ask for new access tokens when making requests to the API. I wrote a detailed blog post about it here: http://www.geekytidbits.com/google-calendar-api-from-ruby/

For example:

#First time authorization
auth_client.code = "authorization code goes here"
auth_client.fetch_access_token!
#Save auth_client.refresh_token now!

#Subsequent requests
auth_client.refresh_token = #grab refresh token from where you saved it
auth_client.fetch_access_token!
#You should now have a fresh access token