it.greenvulcano.gvesb.virtual.google.GoogleAuthenticationCallOperation.java Source code

Introduction

Here is the source code for it.greenvulcano.gvesb.virtual.google.GoogleAuthenticationCallOperation.java

Source

/*******************************************************************************
 * Copyright (c) 2009, 2016 GreenVulcano ESB Open Source Project.
 * All rights reserved.
 *
 * This file is part of GreenVulcano ESB.
 *
 * GreenVulcano ESB is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GreenVulcano ESB is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with GreenVulcano ESB. If not, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/
package it.greenvulcano.gvesb.virtual.google;

import it.greenvulcano.configuration.XMLConfig;
import it.greenvulcano.gvesb.buffer.GVBuffer;
import it.greenvulcano.gvesb.virtual.CallException;
import it.greenvulcano.gvesb.virtual.CallOperation;
import it.greenvulcano.gvesb.virtual.ConnectionException;
import it.greenvulcano.gvesb.virtual.InitializationException;
import it.greenvulcano.gvesb.virtual.InvalidDataException;
import it.greenvulcano.gvesb.virtual.OperationKey;

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.stream.IntStream;

import org.slf4j.Logger;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

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

/**
 * 
 * @version 4.0 07/august/2016
 * @author GreenVulcano Developer Team
 */
public class GoogleAuthenticationCallOperation implements CallOperation {

    private static final Logger logger = org.slf4j.LoggerFactory.getLogger(GoogleAuthenticationCallOperation.class);
    private OperationKey key = null;

    protected String name;

    private Path certificatePath = null;
    private String outputProperty = null;
    private final Set<String> scopes = new LinkedHashSet<>();

    @Override
    public void init(Node node) throws InitializationException {
        logger.debug("Init start");
        try {
            name = XMLConfig.get(node, "@name");
            outputProperty = XMLConfig.get(node, "@property", "*OBJECT");
            certificatePath = Paths.get(XMLConfig.get(node, "@certificate"));

            NodeList configuredScopes = XMLConfig.getNodeList(node, "./scopes/scope");

            IntStream.range(0, configuredScopes.getLength()).mapToObj(configuredScopes::item).forEach(scopeNode -> {
                try {
                    scopes.add(scopeNode.getTextContent());
                } catch (Exception e) {
                    logger.error("Fail to read configuration", e);
                }
            });

        } catch (Exception exc) {
            throw new InitializationException("GV_INIT_SERVICE_ERROR",
                    new String[][] { { "message", exc.getMessage() } }, exc);
        }

    }

    @Override
    public GVBuffer perform(GVBuffer gvBuffer) throws ConnectionException, CallException, InvalidDataException {

        try {

            GoogleCredential googleCredential = GoogleCredential
                    .fromStream(Files.newInputStream(certificatePath, StandardOpenOption.READ))
                    .createScoped(scopes);
            googleCredential.refreshToken();

            String accessToken = googleCredential.getAccessToken();

            gvBuffer.setProperty(outputProperty, accessToken);

        } catch (Exception exc) {
            throw new CallException("GV_CALL_SERVICE_ERROR",
                    new String[][] { { "service", gvBuffer.getService() }, { "system", gvBuffer.getSystem() },
                            { "tid", gvBuffer.getId().toString() }, { "message", exc.getMessage() } },
                    exc);
        }
        return gvBuffer;
    }

    @Override
    public void cleanUp() {
        // do nothing
    }

    @Override
    public void destroy() {
        // do nothing
    }

    @Override
    public String getServiceAlias(GVBuffer gvBuffer) {
        return gvBuffer.getService();
    }

    @Override
    public void setKey(OperationKey key) {
        this.key = key;
    }

    @Override
    public OperationKey getKey() {
        return key;
    }
}