I am authenticating to the Google Calendar API using Scribe, which once uses OAuth 2.0. Authentication completes successfully but I do not know how to store the access token in the database. I'm doing the following:
/*Obter o API USER TOKEN e o API USE SECRET*/
Verifier verifier = new Verifier(code);
Token accessToken = service.getAccessToken(EMPTY_TOKEN, verifier);
API_USER_TOKEN = accessToken.getToken();
API_USER_SECRET = accessToken.getSecret();
/*Guardar tudo na base de dados*/
saveToken(API_USER_TOKEN, API_USER_SECRET);
Then I need to fetch the token and use it again and this is where the problems appear, how do I re-build the token I saved in the database? And how do I update the token?
To update the token I am trying to use the following algorithm:
OAuthRequest request = new OAuthRequest(Verb.POST,"https://www.googleapis.com/oauth2/v3/token");
JSONObject payload = new JSONObject();
request.addQuerystringParameter("grant_type", "refresh_token");
request.addQuerystringParameter("refresh_token", oldToken.getToken());
request.addQuerystringParameter("client_id", API_APP_KEY);
request.addQuerystringParameter("client_secret", API_APP_SECRET);
service.signRequest(oldToken, request);
Response response = request.send();
But I always get the same error (google api response): invalid_grant Bad Request