org.dataconservancy.dcs.access.server.GoogleAuthHelper.java Source code

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Here is the source code for org.dataconservancy.dcs.access.server.GoogleAuthHelper.java

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/*
 * Copyright 2013 The Trustees of Indiana University
 *
 * 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 org.dataconservancy.dcs.access.server;

import java.io.FileInputStream;
import java.io.IOException;

import org.dataconservancy.dcs.access.client.api.GoogleHelper;
import org.dataconservancy.dcs.access.shared.GoogleDetails;

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestFactory;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.jackson.JacksonFactory;
import com.google.api.services.oauth2.model.Userinfo;
import com.google.gson.Gson;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;

public final class GoogleAuthHelper extends RemoteServiceServlet implements GoogleHelper {

    private static final String USER_INFO_URL = "https://www.googleapis.com/oauth2/v1/userinfo";
    private static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();

    private static GoogleClientSecrets clientSecrets;

    public GoogleAuthHelper() {
    }

    //Get accessToken from client
    public Userinfo getUserInfo(final String accessToken) throws IOException {

        final Credential credential = new GoogleCredential().setAccessToken(accessToken);
        HttpRequestFactory requestFactory = HTTP_TRANSPORT.createRequestFactory(credential);
        GenericUrl url = new GenericUrl(USER_INFO_URL);
        HttpRequest request = requestFactory.buildGetRequest(url);
        request.getHeaders().setContentType("application/json");
        String jsonIdentity = request.execute().parseAsString();

        return new Gson().fromJson(jsonIdentity, Userinfo.class);

    }

    private void loadClientSecrets() throws IOException {
        clientSecrets = GoogleClientSecrets.load(new JacksonFactory(),
                getClass().getResourceAsStream("../../../../../client_secret.json"));
    }

    GoogleDetails details;

    @Override
    public GoogleDetails getClientId() {
        try {
            if (clientSecrets == null) {
                loadClientSecrets();
                details = new GoogleDetails();
                details.setClientId(clientSecrets.getDetails().getClientId());
                details.setGoogleAuthUrl(clientSecrets.getDetails().getAuthUri());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return details;
    }

}