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Uniform client facade API implementation to perform common operations on top of REST. Implemented for Google AppEngine runtime with Guice.

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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.appengine;

import com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.common.eventbus.EventBus;
import org.ctoolkit.restapi.client.adapter.BeforeRequestEvent;
import org.ctoolkit.restapi.client.googleapis.GoogleApiCredentialFactory;

import javax.inject.Inject;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Collection;

/**
 * The AppEngine specific factory to build credential instance.
 *
 * @author Aurel Medvegy
 */
class GoogleApiCredentialFactoryAppEngine
        extends GoogleApiCredentialFactory
{
    /**
     * Create factory instance.
     */
    @Inject
    protected GoogleApiCredentialFactoryAppEngine( Builder builder, EventBus eventBus )
    {
        super( builder, eventBus );
    }

    @Override
    public HttpRequestInitializer authorize( Collection scopes, String userAccount )
            throws GeneralSecurityException, IOException
    {
        HttpRequestInitializer credential;

        if ( super.isDevelopmentEnvironment )
        {
            // for local development (outside of the AppEngine) call standard authorization
            credential = super.authorize( scopes, userAccount );
        }
        else
        {
            credential = new AppIdentityCredential( scopes )
            {
                @Override
                public void intercept( HttpRequest request ) throws IOException
                {
                    super.intercept( request );
                    eventBus.post( new BeforeRequestEvent( request ) );
                }

                @Override
                public void initialize( HttpRequest request ) throws IOException
                {
                    super.initialize( request );
                    request.setNumberOfRetries( numberOfRetries );
                }
            };
        }

        return credential;
    }
}