Calender API access through java

[Tushar Prasad]

i have written a code which will read the google calender events. but the problem is , it is opening a browser and asking me to login and then approve the calender api. Is there a way to automate this? I am using Auth2.0. Please suggest me a way which will skip the need to login and then approve.

code i am using is:

import com.google.api.client.auth.oauth2.Credential;

import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;

import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;

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

import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;

import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;

import com.google.api.client.http.HttpTransport;

import com.google.api.client.json.jackson2.JacksonFactory;

import com.google.api.client.json.JsonFactory;

import com.google.api.client.util.store.FileDataStoreFactory;

import com.google.api.client.util.DateTime;

import com.google.api.services.calendar.CalendarScopes;

import com.google.api.services.calendar.model.*;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.util.Arrays;

import java.util.List;

public class CalendarQuickstart{

    /** Application name. */

    private static final String APPLICATION_NAME =

        "Google Calendar API Java Quickstart";

    /** Directory to store user credentials for this application. */

    private static final java.io.File DATA_STORE_DIR = new java.io.File(

        System.getProperty("user.home"), ".credentials/calendar-java-quickstart.json");

    /** Global instance of the {@link FileDataStoreFactory}. */

    private static FileDataStoreFactory DATA_STORE_FACTORY;

    /** Global instance of the JSON factory. */

    private static final JsonFactory JSON_FACTORY =

        JacksonFactory.getDefaultInstance();

    /** Global instance of the HTTP transport. */

    private static HttpTransport HTTP_TRANSPORT;

    /** Global instance of the scopes required by this quickstart.

     *

     * If modifying these scopes, delete your previously saved credentials

     * at ~/.credentials/calendar-java-quickstart.json

     */

    private static final List<String> SCOPES =

        Arrays.asList(CalendarScopes.CALENDAR_READONLY);

    static {

        try {

            HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();

            DATA_STORE_FACTORY = new FileDataStoreFactory(DATA_STORE_DIR);

        } catch (Throwable t) {

            t.printStackTrace();

            System.exit(1);

        }

    }

    /**

     * Creates an authorized Credential object.

     * @return an authorized Credential object.

     * @throws IOException

     */

    public static Credential authorize() throws IOException {

        // Load client secrets.

        InputStream in =

            CalendarQuickstart.class.getResourceAsStream("/CalenderTest/src/client_secret_101809794303-bip4v91qijvqfnhmkmpu91n1en2hquhj.apps.googleusercontent.com.json");

        GoogleClientSecrets clientSecrets =

            GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

        GoogleClientSecrets secrets =new GoogleClientSecrets();

        secrets.setFactory(JSON_FACTORY);

        // Build flow and trigger user authorization request.

        GoogleAuthorizationCodeFlow flow =

                new GoogleAuthorizationCodeFlow.Builder(

                        HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)

                .setDataStoreFactory(DATA_STORE_FACTORY)

                .setAccessType("offline")

                .build();

        Credential credential = new AuthorizationCodeInstalledApp(

            flow, new LocalServerReceiver()).authorize("user");

        System.out.println(

                "Credentials saved to " + DATA_STORE_DIR.getAbsolutePath());

        return credential;

    }

    /**

     * Build and return an authorized Calendar client service.

     * @return an authorized Calendar client service

     * @throws IOException

     */

    public static com.google.api.services.calendar.Calendar

        getCalendarService() throws IOException {

        Credential credential = authorize();

        return new com.google.api.services.calendar.Calendar.Builder(

                HTTP_TRANSPORT, JSON_FACTORY, credential)

                .setApplicationName(APPLICATION_NAME)

                .build();

    }

    public static void main(String[] args) throws IOException {

        // Build a new authorized API client service.

        // Note: Do not confuse this class with the

        //   com.google.api.services.calendar.model.Calendar class.

        com.google.api.services.calendar.Calendar service =

            getCalendarService();

        // List the next 10 events from the primary calendar.

        DateTime now = new DateTime(System.currentTimeMillis());

        Events events = service.events().list("primary")

            .setMaxResults(10)

            .setTimeMin(now)

            .setOrderBy("startTime")

            .setSingleEvents(true)

            .execute();

        List<Event> items = events.getItems();

        if (items.size() == 0) {

            System.out.println("No upcoming events found.");

        } else {

            System.out.println("Upcoming events");

            for (Event event : items) {

                DateTime start = event.getStart().getDateTime();

                if (start == null) {

                    start = event.getStart().getDate();

                }

                System.out.printf("%s (%s)\n", event.getSummary(), start);

            }

        }

    }

}