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Implementation of the Cloud platform abstraction for API metering functionality on the SAP Cloud Platform (Neo).

There is a newer version: 2.28.0

/*
 * Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved.
 */

package com.sap.cloud.sdk.cloudplatform.metering;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.slf4j.Logger;

import com.google.common.base.Charsets;
import com.google.gson.Gson;
import com.netflix.hystrix.HystrixCommandGroupKey;
import com.sap.cloud.sdk.cloudplatform.connectivity.Destination;
import com.sap.cloud.sdk.cloudplatform.connectivity.DestinationAccessor;
import com.sap.cloud.sdk.cloudplatform.connectivity.HttpClientAccessor;
import com.sap.cloud.sdk.cloudplatform.logging.CloudLoggerFactory;
import com.sap.cloud.sdk.frameworks.hystrix.Command;
import com.sap.cloud.sdk.frameworks.hystrix.HystrixUtil;

class OAuthTokenCommand extends Command
{
    private static final Logger logger = CloudLoggerFactory.getLogger(OAuthTokenCommand.class);

    OAuthTokenCommand()
    {
        super(HystrixCommandGroupKey.Factory.asKey(HystrixUtil.getGlobalKey(OAuthTokenCommand.class)), 5000);
    }

    @Override
    protected OAuthToken run()
        throws IOException
    {
        final String destinationName = AccessTokenDestination.getDefaultName();
        final Destination destination = DestinationAccessor.getDestination(destinationName);

        final HttpClient httpClient = HttpClientAccessor.getHttpClient(destination);
        final URI uri = destination.getUri();

        if( logger.isDebugEnabled() ) {
            logger.debug("URI from OAuth token destination: " + uri + ".");
        }

        final HttpUriRequest request = new HttpPost();
        final HttpResponse response = httpClient.execute(request);
        final HttpEntity entity = response.getEntity();

        try( final InputStream stream = entity.getContent() ) {
            return new Gson().fromJson(new InputStreamReader(stream, Charsets.UTF_8), OAuthToken.class);
        }
    }
}