org.owasp.dependencycheck.data.update.nvd.NvdCache Maven / Gradle / Ivy
/*
* This file is part of dependency-check-core.
*
* 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.
*
* Copyright (c) 2021 Jeremy Long. All Rights Reserved.
*/
package org.owasp.dependencycheck.data.update.nvd;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.nio.file.Files;
import java.time.Instant;
import org.apache.commons.io.FileUtils;
import org.owasp.dependencycheck.utils.Settings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Simple four hour cache for files.
*
* @author Jeremy Long
*/
public class NvdCache {
/**
* The Logger.
*/
private static final Logger LOGGER = LoggerFactory.getLogger(DownloadTask.class);
/**
* The settings.
*/
private final Settings settings;
/**
* Creates a new cache for the NVD files.
*
* @param settings ODC settings
*/
public NvdCache(Settings settings) {
this.settings = settings;
}
/**
* Checks if the file is in the cache and within four hours. If found and
* viable, the cached data will be copied to the given file.
*
* @param url the URL of the file cached
* @param file the path of the file to restore from the cache
* @return true
if the URL file is not in the cache; otherwise
* false
*/
public boolean notInCache(URL url, File file) {
try {
//valid for up to four hours.
final long validEpoch = Instant.now().toEpochMilli() - 14400000;
final File tmp = new File(url.getPath());
final String filename = tmp.getName();
final File cache = new File(settings.getDataDirectory(), "nvdcache");
if (!cache.isDirectory()) {
return true;
}
final File nvdFile = new File(cache, filename);
if (nvdFile.isFile() && nvdFile.lastModified() > validEpoch) {
LOGGER.debug("Copying {} from cache", url);
FileUtils.copyFile(nvdFile, file);
return false;
}
return true;
} catch (IOException ex) {
LOGGER.debug("Error checking for nvd file in cache", ex);
return true;
}
}
/**
* Stores a file in the cache.
*
* @param url the URL of the file to cache
* @param file the file to cache
*/
public void storeInCache(URL url, File file) {
if (file.isFile()) {
try {
final File tmp = new File(url.getPath());
final String filename = tmp.getName();
final File cache = new File(settings.getDataDirectory(), "nvdcache");
if (!cache.isDirectory() && !cache.mkdir()) {
return;
}
final File nvdFile = new File(cache, filename);
FileUtils.copyFile(file, nvdFile);
if (!nvdFile.setLastModified(Instant.now().toEpochMilli())) {
LOGGER.debug("Unable to set last modified date on {}", nvdFile);
}
} catch (IOException ex) {
LOGGER.debug("Error storing nvd file in cache", ex);
}
}
}
/**
* Evict a file corresponding to a URL from the cache.
*
* Used to clear files from the cache that are found to be a corrupted download.
*
* @param url
* the origin URL of the file that is to be evicted from the cache
*/
public void evictFromCache(URL url) {
try {
final File tmp = new File(url.getPath());
final String filename = tmp.getName();
final File cache = new File(settings.getDataDirectory(), "nvdcache");
if (!cache.isDirectory()) {
return;
}
LOGGER.error("Removing file from cache for {} as a corrupted download is detected", url);
final File nvdFile = new File(cache, filename);
Files.delete(nvdFile.toPath());
} catch (IOException ex) {
LOGGER.warn("Error evicting corrupt nvd file from cache", ex);
}
}
}