Java Requires Chilkat v10.1.2+

Google OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to get a Google OAuth2 access token from a desktop application or script. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.OAuth2;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

    public static void main(String[] args) {
        // To further clarify, see OAuth 2.0 Authorization Flow

        OAuth2 oauth2 = new OAuth2();

        // For Google OAuth2, set the listen port equal to the port used
        // in the Authorized Redirect URL for the Client ID.
        // For example, in this case the Authorized Redirect URL would be http://localhost:55568/
        // Your app should choose a port not likely not used by another application.
        oauth2.setListenPort(55568);

        oauth2.setAuthorizationEndpoint("https://accounts.google.com/o/oauth2/v2/auth");
        oauth2.setTokenEndpoint("https://www.googleapis.com/oauth2/v4/token");

        // Replace this with your actual client ID.
        oauth2.setClientId("GOOGLE-CLIENT-ID");

        // This is the scope for Google Drive.
        // See https://developers.google.com/identity/protocols/googlescopes
        // Add the scopes that you need.
        oauth2.setScope("https://www.googleapis.com/auth/drive");

        // Begin the OAuth2 authorization code flow.  This returns a URL that should be loaded in a browser.
        String url;
        try {
            url = oauth2.startAuth();

            // Launch the default browser on the system and navigate to the url.
            // The LaunchBrowser method was added in Chilkat v10.1.2.
            oauth2.launchBrowser(url);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Wait for the interactive user to grant permission in the interactive browser session.
        // We'll wait for a max of 90 seconds.
        int numMsWaited = 0;
        while ((numMsWaited < 90000) && (oauth2.getAuthFlowState() < 3)) {
            oauth2.sleepMs(100);
            numMsWaited = numMsWaited + 100;
        }

        // If there was no response from the browser within 90 seconds, then
        // the AuthFlowState will be equal to 1 or 2.
        // 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
        // 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
        // In that case, cancel the background task started in the call to StartAuth.
        if (oauth2.getAuthFlowState() < 3) {
            oauth2.cancel();
            System.out.println("No response from the browser!");
            return;
        }

        // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
        // The possible AuthFlowState values are:
        // 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
        // 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
        // 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
        if (oauth2.getAuthFlowState() == 5) {
            System.out.println("OAuth2 failed to complete.");
            System.out.println(oauth2.getFailureInfo());
            return;
        }

        if (oauth2.getAuthFlowState() == 4) {
            System.out.println("OAuth2 authorization was denied.");
            System.out.println(oauth2.getAccessTokenResponse());
            return;
        }

        if (oauth2.getAuthFlowState() != 3) {
            System.out.println("Unexpected AuthFlowState:" + oauth2.getAuthFlowState());
            return;
        }

        // Save the full JSON access token response to a file.
        StringBuilder sbJson = new StringBuilder();
        sbJson.append(oauth2.getAccessTokenResponse());
        sbJson.writeFile("qa_data/tokens/_googleDrive.json", "utf-8", false);

        // The saved JSON response looks like this:

        //     {
        //      "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
        //      "token_type": "Bearer",
        //      "expires_in": 3600,
        //      "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
        //     }
        //
        System.out.println("OAuth2 authorization granted!");
        System.out.println("Access Token = " + oauth2.getAccessToken());

        // Here is an example showing how to define your OAuth 2.0 Credential in the Google Cloud Console
        // Note: Even though your application is technically not a web app, you should still select "Web Application"
        // because the Redirect URI is going to http://localhost:55568/ where Chilkat will receive it in a background thread.

        // 
    }
}