Controller.ServiceController.java Source code

Introduction

Here is the source code for Controller.ServiceController.java

Source

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Controller;

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.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.gmail.Gmail;
import com.google.api.services.gmail.GmailScopes;
import com.google.api.services.gmail.model.ListMessagesResponse;
import com.google.api.services.gmail.model.Message;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 *
 * @author PhelipeRocha
 */
public class ServiceController {
    /** Application name. */
    private static final String APPLICATION_NAME = "Gmail 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/gmail-java-quickstart");

    /** 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;

    // Print the labels in the user's account.
    private static String USER = "me";

    private final Gmail service;
    private final List<Message> emails;

    /** Global instance of the scopes required by this quickstart.
     *
     * If modifying these scopes, delete your previously saved credentials
     * at ~/.credentials/gmail-java-quickstart
     */
    private static final List<String> SCOPES = Arrays.asList(GmailScopes.GMAIL_READONLY);

    static {
        try {
            HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
            DATA_STORE_FACTORY = new FileDataStoreFactory(DATA_STORE_DIR);
        } catch (GeneralSecurityException | IOException t) {
            System.exit(1);
        }
    }

    /**
     * Build and return an authorized Gmail client service.
     * @return an authorized Gmail client service
     * @throws IOException
     */
    public static Gmail getGmailService() throws IOException {
        Credential credential = authorize();
        return new Gmail.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential).setApplicationName(APPLICATION_NAME)
                .build();
    }

    /**
     * List all Messages of the user's mailbox with labelIds applied.
     *
     * @param service Authorized Gmail API instance.
     * @param userId User's email address. The special value "me"
     * can be used to indicate the authenticated user.
     * @param labelIds Only return Messages with these labelIds applied.
     * @throws IOException
     */
    public static List<Message> listMessages(Gmail service, String userId) throws IOException {
        ListMessagesResponse response = service.users().messages().list(userId).execute();

        List<Message> messages = new ArrayList<>();
        messages.addAll(response.getMessages());

        return messages;
    }

    /**
     * Creates an authorized Credential object.
     * @return an authorized Credential object.
     * @throws IOException
     */
    public static Credential authorize() throws IOException {
        // Load client secrets.
        InputStream in = ServiceController.class.getResourceAsStream("/client_secret.json");
        GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

        // 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;
    }

    public ServiceController() throws IOException {

        // Build a new authorized API client service.
        service = getGmailService();
        emails = listMessages(service, USER);

    }

    public Gmail getService() {
        return service;
    }

    public List<Message> getEmails() {
        return emails;
    }

}