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/*
* ============LICENSE_START=======================================================
* SDC-HELM-VALIDATOR
* ================================================================================
* 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.sdc.helmvalidator.helm.versions;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.file.Path;
import java.util.Optional;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.onap.sdc.helmvalidator.helm.versions.exception.ApiVersionNotFoundException;
import org.onap.sdc.helmvalidator.helm.versions.exception.ReadFileException;
import org.springframework.stereotype.Service;
@Service
public class ApiVersionsReader {
private static final int MAIN_CHART_DIR_DEPTH = 2;
private static final String API_VERSION_PREFIX = "apiVersion:";
private static final Path CHART_FILE_NAME = Path.of("Chart.yaml");
String readVersion(String chartPath) {
return tryReadVersionFromChart(chartPath)
.orElseThrow(ApiVersionNotFoundException::new);
}
private Optional<String> tryReadVersionFromChart(String chartPath) {
try (TarArchiveInputStream tarInput = new TarArchiveInputStream(
new GzipCompressorInputStream(new FileInputStream(chartPath)))) {
return readVersionFromChart(tarInput);
} catch (IOException e) {
throw new ReadFileException("Cannot read tar from path: " + chartPath, e);
}
}
private Optional<String> readVersionFromChart(TarArchiveInputStream tarInput) throws IOException {
TarArchiveEntry currentEntry;
while ((currentEntry = tarInput.getNextTarEntry()) != null) {
if (isMainChartYaml(currentEntry)) {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(tarInput));
return bufferedReader.lines()
.filter(chartLine -> chartLine.contains(API_VERSION_PREFIX))
.map(apiVersionLine -> apiVersionLine.replaceAll(API_VERSION_PREFIX, ""))
.map(String::trim)
.findFirst();
}
}
return Optional.empty();
}
private boolean isMainChartYaml(TarArchiveEntry currentEntry) {
Path entryPath = Path.of(currentEntry.getName());
return currentEntry.isFile()
&& CHART_FILE_NAME.equals(entryPath.getFileName())
&& (entryPath.getNameCount() == MAIN_CHART_DIR_DEPTH);
}
}
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