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/*-
 * ============LICENSE_START=======================================================
 *  Copyright (C) 2020 Nordix Foundation.
 * ================================================================================
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 * ============LICENSE_END=========================================================
 */

package org.onap.aaf.certservice.cmpv2client.impl;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.bouncycastle.asn1.cmp.PKIMessage;
import org.onap.aaf.certservice.cmpv2client.exceptions.CmpClientException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class Cmpv2HttpClient {

    private static final Logger LOG = LoggerFactory.getLogger(Cmpv2HttpClient.class);

    private static final String CONTENT_TYPE = "Content-type";
    private static final String CMP_REQUEST_MIMETYPE = "application/pkixcmp";
    private final CloseableHttpClient httpClient;

    /**
     * constructor for Cmpv2HttpClient
     *
     * @param httpClient CloseableHttpClient used for sending/recieve request.
     */
    Cmpv2HttpClient(CloseableHttpClient httpClient) {
        this.httpClient = httpClient;
    }

    /**
     * Send Post Request to Server
     *
     * @param pkiMessage PKIMessage to send to server
     * @param urlString  url for the server we're sending request
     * @param caName     name of CA server
     * @return PKIMessage received from CMPServer
     * @throws CmpClientException thrown if problems with connecting or parsing response to server
     */
    public byte[] postRequest(
            final PKIMessage pkiMessage, final String urlString, final String caName)
            throws CmpClientException {
        try (ByteArrayOutputStream byteArrOutputStream = new ByteArrayOutputStream()) {
            final HttpPost postRequest = new HttpPost(urlString);
            final byte[] requestBytes = pkiMessage.getEncoded();

            postRequest.setEntity(new ByteArrayEntity(requestBytes));
            postRequest.setHeader(CONTENT_TYPE, CMP_REQUEST_MIMETYPE);

            try (CloseableHttpResponse response = httpClient.execute(postRequest)) {
                response.getEntity().writeTo(byteArrOutputStream);
            }
            return byteArrOutputStream.toByteArray();
        } catch (IOException ioe) {
            CmpClientException cmpClientException =
                    new CmpClientException(
                            String.format("IOException error while trying to connect CA %s", caName), ioe);
            LOG.error("IOException error {}, while trying to connect CA {}", ioe.getMessage(), caName);
            throw cmpClientException;
        }
    }
}