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/*-
* ============LICENSE_START======================================================================
* Copyright (C) 2021 Nokia. All rights reserved.
* ===============================================================================================
* 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.
* ============LICENSE_END========================================================================
*/
package org.onap.dcaegen2.collectors.datafile.http;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.config.SocketConfig;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.HttpHostConnectException;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.util.EntityUtils;
import org.onap.dcaegen2.collectors.datafile.commons.FileCollectClient;
import org.onap.dcaegen2.collectors.datafile.commons.FileServerData;
import org.onap.dcaegen2.collectors.datafile.exceptions.DatafileTaskException;
import org.onap.dcaegen2.collectors.datafile.exceptions.NonRetryableDatafileTaskException;
import org.onap.dcaegen2.collectors.datafile.service.HttpUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.net.ssl.SSLHandshakeException;
import java.io.IOException;
import java.io.InputStream;
import java.net.UnknownHostException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
/**
* Gets file from PNF with HTTPS protocol.
*
* @author <a href="mailto:krzysztof.gajewski@nokia.com">Krzysztof Gajewski</a>
*/
public class DfcHttpsClient implements FileCollectClient {
protected CloseableHttpClient httpsClient;
private static final Logger logger = LoggerFactory.getLogger(DfcHttpsClient.class);
private static final int FIFTEEN_SECONDS = 15 * 1000;
private final FileServerData fileServerData;
private final PoolingHttpClientConnectionManager connectionManager;
public DfcHttpsClient(FileServerData fileServerData, PoolingHttpClientConnectionManager connectionManager) {
this.fileServerData = fileServerData;
this.connectionManager = connectionManager;
}
@Override public void open() {
logger.trace("Setting httpsClient for file download.");
SocketConfig socketConfig = SocketConfig.custom()
.setSoKeepAlive(true)
.build();
RequestConfig requestConfig = RequestConfig.custom()
.setConnectTimeout(FIFTEEN_SECONDS)
.build();
httpsClient = HttpClients.custom()
.setConnectionManager(connectionManager)
.setDefaultSocketConfig(socketConfig)
.setDefaultRequestConfig(requestConfig)
.build();
logger.trace("httpsClient prepared for connection.");
}
@Override public void collectFile(String remoteFile, Path localFile) throws DatafileTaskException {
logger.trace("Prepare to collectFile {}", localFile);
HttpGet httpGet = new HttpGet(HttpUtils.prepareHttpsUri(fileServerData, remoteFile));
String authorizationContent = getAuthorizationContent();
if (!authorizationContent.isEmpty()) {
httpGet.addHeader("Authorization", authorizationContent);
}
try {
HttpResponse httpResponse = makeCall(httpGet);
processResponse(httpResponse, localFile);
} catch (IOException e) {
throw new DatafileTaskException("Error downloading file from server. ", e);
}
logger.trace("HTTPS collectFile OK");
}
private String getAuthorizationContent() throws DatafileTaskException {
String jwtToken = HttpUtils.getJWTToken(fileServerData);
if (shouldUseBasicAuth(jwtToken)) {
return HttpUtils.basicAuthContent(this.fileServerData.userId(), this.fileServerData.password());
}
return HttpUtils.jwtAuthContent(jwtToken);
}
private boolean shouldUseBasicAuth(String jwtToken) throws DatafileTaskException {
return basicAuthValidNotPresentOrThrow() && jwtToken.isEmpty();
}
protected boolean basicAuthValidNotPresentOrThrow() throws DatafileTaskException {
if (isAuthDataEmpty()) {
return false;
}
if (HttpUtils.isBasicAuthDataFilled(fileServerData)) {
return true;
}
throw new DatafileTaskException("Not sufficient basic auth data for file.");
}
private boolean isAuthDataEmpty() {
return this.fileServerData.userId().isEmpty() && this.fileServerData.password().isEmpty();
}
protected HttpResponse makeCall(HttpGet httpGet)
throws IOException, DatafileTaskException {
try {
HttpResponse httpResponse = executeHttpClient(httpGet);
if (isResponseOk(httpResponse)) {
return httpResponse;
}
EntityUtils.consume(httpResponse.getEntity());
if (isErrorInConnection(httpResponse)) {
throw new NonRetryableDatafileTaskException(HttpUtils.retryableResponse(getResponseCode(httpResponse)));
}
throw new DatafileTaskException(HttpUtils.nonRetryableResponse(getResponseCode(httpResponse)));
} catch (ConnectTimeoutException | UnknownHostException | HttpHostConnectException | SSLHandshakeException e) {
throw new NonRetryableDatafileTaskException(
"Unable to get file from xNF. No retry attempts will be done.", e);
}
}
protected CloseableHttpResponse executeHttpClient(HttpGet httpGet)
throws IOException {
return httpsClient.execute(httpGet);
}
protected boolean isResponseOk(HttpResponse httpResponse) {
return getResponseCode(httpResponse) == 200;
}
private int getResponseCode(HttpResponse httpResponse) {
return httpResponse.getStatusLine().getStatusCode();
}
protected boolean isErrorInConnection(HttpResponse httpResponse) {
return getResponseCode(httpResponse) >= 400;
}
protected void processResponse(HttpResponse response, Path localFile) throws IOException {
logger.trace("Starting to process response.");
HttpEntity entity = response.getEntity();
InputStream stream = entity.getContent();
long numBytes = writeFile(localFile, stream);
stream.close();
EntityUtils.consume(entity);
logger.trace("Transmission was successful - {} bytes downloaded.", numBytes);
}
protected long writeFile(Path localFile, InputStream stream) throws IOException {
return Files.copy(stream, localFile, StandardCopyOption.REPLACE_EXISTING);
}
@Override public void close() {
logger.trace("Https client has ended downloading process.");
}
}
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