Google fit offline - access token issue - google-api

Question

Hi Everyone i facing one strange issue from long time with few accounts while syncing google fit data for few users.
We have followed below document for offline-access of google fit - https://developers.google.com/identity/sign-in/android/offline-access
Step 1 - get access token (Here we are refreshing token as when require), In this step we are getting error
400 Bad Request POST https://oauth2.googleapis.com/token { "error" : "invalid_grant", "error_description" : "Bad Request" }
public String getAccessToken(ThirdPartyAuthDto r) throws Exception {
GoogleClientSecrets clientSecrets = getGoogleClient();
// request token
if (r.getRefreshToken() == null || (r.getRefreshToken() != null && r.getRefreshToken().length() == 0)) {
GoogleTokenResponse activeUser = new GoogleAuthorizationCodeTokenRequest(new NetHttpTransport(),
new JacksonFactory(), "https://oauth2.googleapis.com/token",
clientSecrets.getDetails().getClientId(), clientSecrets.getDetails().getClientSecret(),
r.getServerAuthCode(), "").execute();
r.setAccessToken(activeUser.getAccessToken());
r.setTokenType(activeUser.getTokenType());
r.setExpiresInSeconds(activeUser.getExpiresInSeconds());
r.setRefreshToken(activeUser.getRefreshToken());
r.setScope(activeUser.getScope());
r.setLastRequestDate(new Date());
r.setLastRequestSuccessDate(new Date(new Date().getTime() - (5 * 60000)));
thirdPartyRepository.save(r);
return activeUser.getAccessToken();
} else {
boolean tokenRequest = true;
if (r.getLastRequestSuccessDate() != null
&& new Date().before(new Date(r.getLastRequestSuccessDate().getTime() + r.getExpiresInSeconds() * 1000))){
tokenRequest = false;
}
if(tokenRequest) {
TokenResponse tokenResponse = refreshAccessToken(r.getRefreshToken(), clientSecrets.getDetails().getClientId(), clientSecrets.getDetails().getClientSecret());
r.setAccessToken(tokenResponse.getAccessToken());
r.setLastRequestSuccessDate(new Date(new Date().getTime() - (5 * 60000)));
r.setExpiresInSeconds(tokenResponse.getExpiresInSeconds());
thirdPartyRepository.save(r);
return tokenResponse.getAccessToken();
}else{
return r.getAccessToken();
}
}
}
public TokenResponse refreshAccessToken(String refreshToken, String clientId, String clientSecrets) throws IOException {
TokenResponse response = new GoogleRefreshTokenRequest(
new NetHttpTransport(),
new JacksonFactory(),
refreshToken,
clientId,
clientSecrets)
.execute();
System.out.println("Access token: " + response.getAccessToken());
return response;
}

Answer 1

Getting invalid grant when using a refresh token normally means that the refresh token is expired or was revoked.
Possible reasons for expired refresh tokens.
the user has revoked your access
you have more then 50 outstanding refresh tokens for this user
The app is still in the testing phase which means refresh tokens expire after seven days.