CODEWITHSUNDEEP
javaoauth-2.0google-oauthgmail-api
ravi.t
ravi.t

Reputation: 53

Getting refresh_token as null on re-authenticating Gmail API for sending email using Oauth

I am using Scribe for oauth to get access_token and refresh_token for the auth_code. It worked well for the first authentication. When I disabled the credentials in my application, the tokens are still existing with the Gmail connected apps for my application. When I re-enable the oauth, I am getting only valid new access_token for the new auth_code. But the refresh_token is null. I tried to replicate the same with oauthplayground, there I could see valid refresh and access tokens, while playground tokens still existed in the google connected apps.

here is the code I implemented with scribe-1.3.0 API

    OAuthRequest oAuthRequest = new OAuthRequest(Verb.POST, "https://accounts.google.com/o/oauth2/token");

    oAuthRequest.addBodyParameter("client_id", SMTP_OAUTH_CLIENT_ID);
    oAuthRequest.addBodyParameter("client_secret", SMTP_OAUTH_CLIENT_SECRET);

    oAuthRequest.addBodyParameter("scope", scope);
    oAuthRequest.addBodyParameter("redirect_uri", GoogleApi.getRedirectURL());

    oAuthRequest.addBodyParameter("code", authCode);
    oAuthRequest.addBodyParameter("grant_type", "authorization_code");

    Response response = oAuthRequest.send();

Here is the similar code tried with googleapi-client-1.20, the result is still same.

        GoogleTokenResponse tokenResponse = new GoogleAuthorizationCodeTokenRequest(
                new NetHttpTransport(), 
                new JacksonFactory(), 
                SMTP_OAUTH_CLIENT_ID, SMTP_OAUTH_CLIENT_SECRET, 
                authCode, 
                GoogleApi.getRedirectURL())
                    .execute();

        Credential gcredential = new GoogleCredential
                .Builder()
                .setTransport(new NetHttpTransport.Builder().build())
                .setJsonFactory(new JacksonFactory())
                .setClientSecrets(SMTP_OAUTH_CLIENT_ID, SMTP_OAUTH_CLIENT_SECRET)
                .build()
                .setFromTokenResponse(tokenResponse);

        gcredential.refreshToken();

        System.out.println(gcredential.getRefreshToken());

Can anyone help me where I am going wrong? Thanks for your time in looking at this issue.

Upvotes: 1

Views: 211

Answers (1)

Purushotham
Purushotham

Reputation: 26

When re-authenticating you need to set these parameters access_type=offline and approval_prompt=force then you will recieve refresh_token

Below is an example URL https://accounts.google.com/o/oauth2/auth?client_id=CLIENT_ID&scope=SCOPE&redirect_uri=REDIRECT_URL&response_type=code&access_type=offline&approval_prompt=force

Upvotes: 1

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