guestbook.PlusSampleAuthCallbackServlet.java Source code

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Here is the source code for guestbook.PlusSampleAuthCallbackServlet.java

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/*
 * Copyright (c) 2013 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package guestbook;

import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleTokenResponse;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Sample servlet that exchanges the authorization code for user credentials and then redirects back
 * to the main servlet.
 *
 * @author Nick Miceli
 */
public class PlusSampleAuthCallbackServlet extends HttpServlet {

    private static final long serialVersionUID = 1;

    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        // Note that this implementation does not handle the user denying authorization.
        GoogleAuthorizationCodeFlow authFlow = Utils.initializeFlow();

        //if null then authorization was denied
        if (req.getParameter("code") == null) {
            resp.sendRedirect("/settings.jsp");
            return;
        }
        // Exchange authorization code for user credentials.
        GoogleTokenResponse tokenResponse = authFlow.newTokenRequest(req.getParameter("code"))
                .setRedirectUri(Utils.getRedirectUri(req)).execute();
        // Save the credentials for this user so we can access them from the main servlet.
        authFlow.createAndStoreCredential(tokenResponse, Utils.getUserId(req));
        resp.sendRedirect(Utils.MAIN_SERVLET_PATH);
    }
}