org.kaaproject.kaa.client.transport.DesktopHttpClient.java Source code

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Here is the source code for org.kaaproject.kaa.client.transport.DesktopHttpClient.java

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/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * 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.kaaproject.kaa.client.transport;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.Charsets;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.kaaproject.kaa.common.endpoint.CommonEpConstans;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.LinkedHashMap;

public class DesktopHttpClient extends AbstractHttpClient {

    /**
     * The Constant LOG.
     */
    public static final Logger LOG = LoggerFactory // NOSONAR
            .getLogger(DesktopHttpClient.class);

    private CloseableHttpClient httpClient;
    private volatile HttpPost method;

    /**
     * All-args constructor.
     */
    public DesktopHttpClient(String url, PrivateKey privateKey, PublicKey publicKey, PublicKey remotePublicKey) {
        super(url, privateKey, publicKey, remotePublicKey);
        this.httpClient = HttpClientBuilder.create().build();
        this.method = null;
    }

    @Override
    public byte[] executeHttpRequest(String uri, LinkedHashMap<String, byte[]> entity, boolean verifyResponse)
            throws Exception { //NOSONAR
        byte[] responseDataRaw = null;
        method = new HttpPost(url + uri);
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        for (String key : entity.keySet()) {
            builder.addBinaryBody(key, entity.get(key));
        }
        HttpEntity requestEntity = builder.build();
        method.setEntity(requestEntity);
        if (!Thread.currentThread().isInterrupted()) {
            LOG.debug("Executing request {}", method.getRequestLine());
            CloseableHttpResponse response = httpClient.execute(method);
            try {
                LOG.debug("Received {}", response.getStatusLine());
                int status = response.getStatusLine().getStatusCode();
                if (status >= 200 && status < 300) {
                    responseDataRaw = getResponseBody(response, verifyResponse);
                } else {
                    throw new TransportException(status);
                }
            } finally {
                response.close();
                method = null;
            }
        } else {
            method = null;
            throw new InterruptedException();
        }

        return responseDataRaw;
    }

    private byte[] getResponseBody(HttpResponse response, boolean verifyResponse)
            throws IOException, GeneralSecurityException {

        HttpEntity resEntity = response.getEntity();
        if (resEntity != null) {
            byte[] body = EntityUtils.toByteArray(resEntity);
            EntityUtils.consume(resEntity);

            if (verifyResponse) {
                Header signatureHeader = response.getFirstHeader(CommonEpConstans.SIGNATURE_HEADER_NAME);

                if (signatureHeader == null) {
                    throw new IOException("can't verify message");
                }

                byte[] signature;
                if (signatureHeader.getValue() != null) {
                    signature = Base64.decodeBase64(signatureHeader.getValue().getBytes(Charsets.UTF_8));
                } else {
                    signature = new byte[0];
                }
                return verifyResponse(body, signature);
            } else {
                return body;
            }
        } else {
            throw new IOException("can't read message");
        }
    }

    @Override
    public void close() throws IOException {
        this.httpClient.close();
    }

    @Override
    public void abort() {
        if (method != null && !method.isAborted()) {
            LOG.info("Forcely aborting current request...");
            method.abort();
        }
    }

    @Override
    public boolean canAbort() {
        return method != null && !method.isAborted();
    }

}