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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2021 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.openecomp.sdc.be.csar.storage;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.UUID;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
import org.openecomp.sdc.be.csar.storage.exception.CsarSizeReducerException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CsarSizeReducer implements PackageSizeReducer {
private static final Logger LOGGER = LoggerFactory.getLogger(CsarSizeReducer.class);
private final CsarPackageReducerConfiguration configuration;
public CsarSizeReducer(final CsarPackageReducerConfiguration configuration) {
this.configuration = configuration;
}
@Override
public byte[] reduce(final Path csarPackagePath) {
final var reducedCsarPath = Path.of(csarPackagePath + "." + UUID.randomUUID());
try (final var zf = new ZipFile(csarPackagePath.toString());
final var zos = new ZipOutputStream(new BufferedOutputStream(Files.newOutputStream(reducedCsarPath)))) {
zf.entries().asIterator().forEachRemaining(entry -> {
final var entryName = entry.getName();
try {
if (!entry.isDirectory()) {
zos.putNextEntry(new ZipEntry(entryName));
if (isCandidateToRemove(entry)) {
// replace with EMPTY string to avoid package description inconsistency/validation errors
zos.write("".getBytes());
} else {
zos.write(zf.getInputStream(entry).readAllBytes());
}
}
zos.closeEntry();
} catch (final IOException ei) {
final var errorMsg = String.format("Failed to extract '%s' from zip '%s'", entryName, csarPackagePath);
throw new CsarSizeReducerException(errorMsg, ei);
}
});
} catch (final IOException ex1) {
rollback(reducedCsarPath);
final var errorMsg = String.format("An unexpected problem happened while reading the CSAR '%s'", csarPackagePath);
throw new CsarSizeReducerException(errorMsg, ex1);
}
final byte[] reducedCsarBytes;
try {
reducedCsarBytes = Files.readAllBytes(reducedCsarPath);
} catch (final IOException e) {
final var errorMsg = String.format("Could not read bytes of file '%s'", csarPackagePath);
throw new CsarSizeReducerException(errorMsg, e);
}
try {
Files.delete(reducedCsarPath);
} catch (final IOException e) {
final var errorMsg = String.format("Could not delete temporary file '%s'", reducedCsarPath);
throw new CsarSizeReducerException(errorMsg, e);
}
return reducedCsarBytes;
}
private void rollback(final Path reducedCsarPath) {
if (Files.exists(reducedCsarPath)) {
try {
Files.delete(reducedCsarPath);
} catch (final Exception ex2) {
LOGGER.warn("Could not delete temporary file '{}'", reducedCsarPath, ex2);
}
}
}
private boolean isCandidateToRemove(final ZipEntry zipEntry) {
final String zipEntryName = zipEntry.getName();
return configuration.getFoldersToStrip().stream().anyMatch(Path.of(zipEntryName)::startsWith)
|| zipEntry.getSize() > configuration.getSizeLimit();
}
}
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