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Google API CtoolkiT REST API Client Implementation of Google Identity Toolkit

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/*
 * Copyright (c) 2016 Comvai, s.r.o. All Rights Reserved.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package org.ctoolkit.restapi.client.identity;

import com.google.api.client.http.HttpRequest;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import org.ctoolkit.restapi.client.adapter.BeforeRequestEvent;

import javax.inject.Inject;
import javax.inject.Provider;
import javax.inject.Singleton;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;

/**
 * The event bus subscriber to listen on {@link BeforeRequestEvent} in order to forward origin request token value
 * (identity toolkit cookie {@link Identity#GTOKEN}), if any, via Google API client request (value of the event) header.
 *
 * @author Aurel Medvegy
 */
@Singleton
public class IdentityTokenBeforeRequestSubscriber
{
    /*
     * Provider to provide current http servlet request
     */
    private final Provider provider;

    @Inject
    public IdentityTokenBeforeRequestSubscriber( EventBus eventBus, Provider provider )
    {
        eventBus.register( this );
        this.provider = provider;
    }

    @Subscribe
    public void onBeforeRequestEvent( BeforeRequestEvent event )
    {
        HttpRequest request = event.getRequest();
        HttpServletRequest originServletRequest = provider.get();

        Cookie[] cookies = originServletRequest.getCookies();

        if ( cookies == null )
        {
            return;
        }

        String token = null;
        for ( Cookie cookie : cookies )
        {
            if ( Identity.GTOKEN.equals( cookie.getName() ) )
            {
                token = cookie.getValue();
                break;
            }
        }

        if ( token != null )
        {
            request.getHeaders().put( Identity.GTOKEN, token );
        }
    }
}