Google Calendar API

Interact with Google CalendarList, Calendar and Event

Main function includes get list, get instance, insert, update, and delete

To access the authorize url, use redirect conn, external: Google.authorize_url!()

To retrieve token, define route and callback uri in google oauth redirect uri /auth/callback

Configuration

Add the following configuration in your *.exs

config :google_calendar, :base_url, "https://www.googleapis.com/calendar/v3"
config :google_calendar, :content_type, [{"content-type", "application/json"}]

config :google_calendar, Google,
  client_id: GOOGLE_CLIENT_ID,
  client_secret: GOOGLE_CLIENT_SECRET,
  redirect_uri: "https://your_site.com/auth/callback"

Auth_controller

# To retrieve authorize_url, call function
Google.authorize_url!()

# Call back function
def callback(conn, %{"code" => code}) do
  # Exchange an auth code for an access token
  client = Google.get_token!(code: code)

  # You might want to put access_token in session for latter use and redirect url
  conn
  |> put_session(:token, client.token)
  |> redirect(to: "/")
end

# To recreate client
token = get_session(conn, :token)
client = Map.merge(Google.client(), %{token: token})

# To refresh token, save your refresh token in database
token = get_session(conn, :token)
if OAuth2.AccessToken.expired?(token) do
  token = Map.merge(token, %{refresh_token: REFRESH_TOKEN})

  Google.client()
  |> Map.merge(%{token: token})
  |> OAuth2.Client.refresh_token!()
end