shaded.org.eclipse.aether.internal.impl.synccontext.named.HashingNameMapper Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package shaded.shaded.org.eclipse.aether.internal.impl.synccontext.named;
import java.util.Collection;
import java.util.stream.Collectors;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.metadata.Metadata;
import org.eclipse.aether.util.ConfigUtils;
import org.eclipse.aether.util.StringDigestUtil;
import static java.util.Objects.requireNonNull;
/**
* Wrapping {@link NameMapper}, that wraps another {@link NameMapper} and hashes resulting strings. It makes use of
* fact that (proper) Hash will create unique fixed length string for each different input string (so injection still
* stands). This mapper produces file system friendly names. Supports different "depths" (0-4 inclusive) where the
* name will contain 0 to 4 level deep directories.
*
* This mapper is usable in any scenario, but intent was to produce more "compact" name mapper for file locking.
*
* @since 1.9.0
*/
public class HashingNameMapper implements NameMapper {
private static final String CONFIG_PROP_DEPTH = "aether.syncContext.named.hashing.depth";
private final NameMapper delegate;
public HashingNameMapper(final NameMapper delegate) {
this.delegate = requireNonNull(delegate);
}
@Override
public boolean isFileSystemFriendly() {
return true; // hashes delegated strings, so whatever it wrapped, it does not come through
}
@Override
public Collection nameLocks(
RepositorySystemSession session,
Collection artifacts,
Collection metadatas) {
final int depth = ConfigUtils.getInteger(session, 2, CONFIG_PROP_DEPTH);
if (depth < 0 || depth > 4) {
throw new IllegalArgumentException("allowed depth value is between 0 and 4 (inclusive)");
}
return delegate.nameLocks(session, artifacts, metadatas).stream()
.map(n -> hashName(n, depth))
.collect(Collectors.toList());
}
private String hashName(final String name, final int depth) {
String hashedName = StringDigestUtil.sha1(name);
if (depth == 0) {
return hashedName;
}
StringBuilder prefix = new StringBuilder("");
int i = 0;
while (i < hashedName.length() && i / 2 < depth) {
prefix.append(hashedName, i, i + 2).append("/");
i += 2;
}
return prefix.append(hashedName).toString();
}
}