Java

Google Photos OAuth2 Access Token

See more Google Photos Examples

Demonstrates how to get a Google Photos 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) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        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:3017/
        // Your app should choose a port not likely not used by any other application.
        oauth2.setListenPort(3017);

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

        // Replace these with actual values.
        oauth2.setClientId("GOOGLE-CLIENT-ID");
        oauth2.setClientSecret("GOOGLE-CLIENT-SECRET");

        oauth2.setCodeChallenge(true);
        oauth2.setCodeChallengeMethod("S256");

        // This is a scope for Google Photos.  See https://developers.google.com/photos/library/guides/authentication-authorization
        // This scope provides read/write access but not sharing.
        oauth2.setScope("https://www.googleapis.com/auth/photoslibrary");

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

            // Launch the system's default browser navigated to the URL.
            oauth2.launchBrowser(url);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Now wait for the authorization.
        // We'll wait for a max of 120 seconds.
        int numMsWaited = 0;
        while ((numMsWaited < 120000) && (oauth2.getAuthFlowState() < 3)) {
            oauth2.sleepMs(100);
            numMsWaited = numMsWaited + 100;
        }

        // If there was no response from the browser within 120 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/googlePhotos.json", "utf-8", false);

        // The saved JSON response looks like this:
        // {
        //   "access_token": "ya29.GlamBqWR6cp8lEfJMmTHVEua45912XLKoq4djyHl_Z3CEIzsPLIZkJSGie5oOrbaggy1rjJHn1zW5bjqSesGr5MEYIp9Hx-0CuvjVYf8srg2jeaDMwMACvzemp43",
        //   "expires_in": 3600,
        //   "refresh_token": "1/rl6k16nysDl9Bp1EhRH9F1WyRIoiSQAvko49Z4yY694MT5V1QXLj2ibNZGaRgek0",
        //   "scope": "https://www.googleapis.com/auth/photoslibrary",
        //   "token_type": "Bearer"
        // }

        System.out.println("OAuth2 authorization granted!");
        System.out.println("Access Token = " + oauth2.getAccessToken());
    }
}