[
https://issues.apache.org/jira/browse/MRESOLVER-269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17610577#comment-17610577
]
ASF GitHub Bot commented on MRESOLVER-269:
------------------------------------------
michael-o commented on code in PR #199:
URL: https://github.com/apache/maven-resolver/pull/199#discussion_r982378937
##########
maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/checksum/FileTrustedChecksumsSourceSupport.java:
##########
@@ -0,0 +1,149 @@
+package org.eclipse.aether.internal.impl.checksum;
+
+/*
+ * 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.
+ */
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.repository.ArtifactRepository;
+import org.eclipse.aether.spi.checksums.TrustedChecksumsSource;
+import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
+import org.eclipse.aether.util.ConfigUtils;
+import org.eclipse.aether.util.DirectoryUtils;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * Support class for implementing {@link TrustedChecksumsSource} backed by
local filesystem. It implements basic support
+ * like bqsedir calculation, "enabled" flag and "originAware" flag.
Review Comment:
typo
##########
maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/checksum/CompactFileTrustedChecksumsSource.java:
##########
@@ -0,0 +1,166 @@
+package org.eclipse.aether.internal.impl.checksum;
+
+/*
+ * 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.
+ */
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
+import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.repository.ArtifactRepository;
+import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
+import org.eclipse.aether.util.artifact.ArtifactIdUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Compact file {@link FileTrustedChecksumsSourceSupport} implementation that
use specified directory as base
+ * directory, where it expects a "summary" file named as
"checksums.${checksumExt}" for each checksum algorithm, and
+ * file format is artifact ID and checksum separated by space per line. The
format supports comments "#" (hash) and
+ * empty lines (both are ignored).
+ * <p>
+ * The source may be configured to be "origin aware", in that case it will
factor in origin repository ID as well into
+ * file name (for example "central-checksums.sha1").
+ * <p>
+ * The name of this implementation is "file-compact".
+ *
+ * @since TBD
+ */
+@Singleton
+@Named( CompactFileTrustedChecksumsSource.NAME )
+public final class CompactFileTrustedChecksumsSource
+ extends FileTrustedChecksumsSourceSupport
+{
+ public static final String NAME = "file-compact";
+
+ private static final String CHECKSUM_FILE_PREFIX = "checksums.";
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(
CompactFileTrustedChecksumsSource.class );
+
+ private final ConcurrentHashMap<Path, ConcurrentHashMap<String,
ConcurrentHashMap<String, String>>> checksumCache;
+
+ @Inject
+ public CompactFileTrustedChecksumsSource()
+ {
+ super( NAME );
+ this.checksumCache = new ConcurrentHashMap<>();
+ }
+
+ @Override
+ protected Map<String, String> performLookup( RepositorySystemSession
session,
+ Path basedir,
+ Artifact artifact,
+ ArtifactRepository
artifactRepository,
+
List<ChecksumAlgorithmFactory> checksumAlgorithmFactories )
+ {
+ final HashMap<String, String> checksums = new HashMap<>();
+ final ConcurrentHashMap<String, ConcurrentHashMap<String, String>>
baseDirProvidedHashes = checksumCache
Review Comment:
basedirProvidedChecksums
##########
maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/checksum/CompactFileTrustedChecksumsSource.java:
##########
@@ -0,0 +1,166 @@
+package org.eclipse.aether.internal.impl.checksum;
+
+/*
+ * 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.
+ */
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
+import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.repository.ArtifactRepository;
+import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
+import org.eclipse.aether.util.artifact.ArtifactIdUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Compact file {@link FileTrustedChecksumsSourceSupport} implementation that
use specified directory as base
+ * directory, where it expects a "summary" file named as
"checksums.${checksumExt}" for each checksum algorithm, and
+ * file format is artifact ID and checksum separated by space per line. The
format supports comments "#" (hash) and
+ * empty lines (both are ignored).
+ * <p>
+ * The source may be configured to be "origin aware", in that case it will
factor in origin repository ID as well into
+ * file name (for example "central-checksums.sha1").
+ * <p>
+ * The name of this implementation is "file-compact".
+ *
+ * @since TBD
+ */
+@Singleton
+@Named( CompactFileTrustedChecksumsSource.NAME )
+public final class CompactFileTrustedChecksumsSource
+ extends FileTrustedChecksumsSourceSupport
+{
+ public static final String NAME = "file-compact";
+
+ private static final String CHECKSUM_FILE_PREFIX = "checksums.";
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(
CompactFileTrustedChecksumsSource.class );
+
+ private final ConcurrentHashMap<Path, ConcurrentHashMap<String,
ConcurrentHashMap<String, String>>> checksumCache;
+
+ @Inject
+ public CompactFileTrustedChecksumsSource()
+ {
+ super( NAME );
+ this.checksumCache = new ConcurrentHashMap<>();
+ }
+
+ @Override
+ protected Map<String, String> performLookup( RepositorySystemSession
session,
+ Path basedir,
+ Artifact artifact,
+ ArtifactRepository
artifactRepository,
+
List<ChecksumAlgorithmFactory> checksumAlgorithmFactories )
+ {
+ final HashMap<String, String> checksums = new HashMap<>();
+ final ConcurrentHashMap<String, ConcurrentHashMap<String, String>>
baseDirProvidedHashes = checksumCache
+ .computeIfAbsent( basedir, b -> new ConcurrentHashMap<>() );
+ final String prefix;
+ if ( isOriginAware( session ) )
+ {
+ if ( artifactRepository != null )
+ {
+ prefix = artifactRepository.getId() + "-" +
CHECKSUM_FILE_PREFIX;
+ }
+ else
+ {
+ prefix = session.getLocalRepository().getId() + "-" +
CHECKSUM_FILE_PREFIX;
+ }
+ }
+ else
+ {
+ prefix = CHECKSUM_FILE_PREFIX;
+ }
+
+ for ( ChecksumAlgorithmFactory checksumAlgorithmFactory :
checksumAlgorithmFactories )
+ {
+ ConcurrentHashMap<String, String> algorithmHashes =
baseDirProvidedHashes.computeIfAbsent(
+ checksumAlgorithmFactory.getName(),
+ algName -> loadProvidedHashes(
+ basedir.resolve( prefix +
checksumAlgorithmFactory.getFileExtension() )
+ )
+ );
+ String checksum = algorithmHashes.get( ArtifactIdUtils.toId(
artifact ) );
+ if ( checksum != null )
+ {
+ checksums.put( checksumAlgorithmFactory.getName(), checksum );
+ }
+ }
+ return checksums;
+ }
+
+ private ConcurrentHashMap<String, String> loadProvidedHashes( Path
checksumFile )
Review Comment:
Same here
##########
maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/checksum/FileTrustedChecksumsSourceSupport.java:
##########
@@ -0,0 +1,149 @@
+package org.eclipse.aether.internal.impl.checksum;
+
+/*
+ * 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.
+ */
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.repository.ArtifactRepository;
+import org.eclipse.aether.spi.checksums.TrustedChecksumsSource;
+import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
+import org.eclipse.aether.util.ConfigUtils;
+import org.eclipse.aether.util.DirectoryUtils;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * Support class for implementing {@link TrustedChecksumsSource} backed by
local filesystem. It implements basic support
+ * like bqsedir calculation, "enabled" flag and "originAware" flag.
+ * <p>
+ * The configuration keys supported:
+ * <ul>
+ * <li><pre>aether.trustedChecksumsSource.${name}.enabled</pre> (boolean)
must be explicitly set to "true"
+ * to become enabled</li>
+ * <li><pre>aether.trustedChecksumsSource.${name}.basedir</pre> (string,
path) directory from where implementation
+ * can use files. If unset, default value is ".checksums" and is resolved
from local repository basedir.</li>
+ * <li><pre>aether.trustedChecksumsSource.${name}.originAware</pre>
(boolean) whether to make implementation
+ * "originAware", to factor in origin repository ID as well or not.</li>
+ * </ul>
+ * <p>
+ * This implementation ensures that implementations have "name" property, used
in configuration properties above.
+ *
+ * @since TBD
+ */
+abstract class FileTrustedChecksumsSourceSupport
+ implements TrustedChecksumsSource
+{
+ private static final String CONFIG_PROP_PREFIX =
"aether.trustedChecksumsSource.";
+
+ private static final String CONF_NAME_ENABLED = "enabled";
+
+ private static final String CONF_NAME_BASEDIR = "basedir";
+
+ private static final String CONF_NAME_ORIGIN_AWARE = "originAware";
+
+ /**
+ * Visible for testing.
+ */
+ static final String LOCAL_REPO_PREFIX = ".checksums";
+
+ private final String name;
+
+ FileTrustedChecksumsSourceSupport( String name )
+ {
+ this.name = requireNonNull( name );
+ }
+
+ /**
+ * The implementation will call into underlying code only if enabled,
chosen basedir exists, and requested
+ * checksum algorithms are not empty.
+ */
+ @Override
+ public Map<String, String> getTrustedArtifactChecksums(
RepositorySystemSession session,
+ Artifact artifact,
+ ArtifactRepository
artifactRepository,
+
List<ChecksumAlgorithmFactory> checksumAlgorithmFactories )
+ {
+ boolean enabled = ConfigUtils.getBoolean( session, false,
configPropKey( CONF_NAME_ENABLED ) );
+ if ( enabled )
+ {
+ Path baseDir = getBasedir( session );
+ if ( baseDir != null && !checksumAlgorithmFactories.isEmpty() )
+ {
+ Map<String, String> result = performLookup(
+ session, baseDir, artifact, artifactRepository,
checksumAlgorithmFactories );
+
+ return result == null || result.isEmpty() ? null : result;
+ }
+ }
+ return null;
+ }
+
+ protected abstract Map<String, String> performLookup(
RepositorySystemSession session,
+ Path baseDir,
+ Artifact artifact,
+ ArtifactRepository
artifactRepository,
+
List<ChecksumAlgorithmFactory> checksumAlgorithmFactories );
+
+ /**
+ * To be used by underlying implementations to form configuration property
keys properly scoped.
+ */
+ protected String configPropKey( String name )
+ {
+ requireNonNull( name );
+ return CONFIG_PROP_PREFIX + this.name + "." + name;
+ }
+
+ /**
+ * Returns {@code true} if session configuration contains "originAware"
property set to {@code true}.
+ */
+ protected boolean isOriginAware( RepositorySystemSession session )
+ {
+ return ConfigUtils.getBoolean( session, false, configPropKey(
CONF_NAME_ORIGIN_AWARE ) );
+ }
+
+ /**
+ * Uses common {@link DirectoryUtils} to calculate (but not) create
basedir for this implementation. Returns
+ * {@code null} if the calculated basedir does not exist.
+ */
+ private Path getBasedir( RepositorySystemSession session )
+ {
+ try
+ {
+ Path basedir = DirectoryUtils.resolveDirectory(
+ session, LOCAL_REPO_PREFIX, configPropKey(
CONF_NAME_BASEDIR ), false );
+ if ( !Files.isDirectory( basedir ) )
Review Comment:
Won't this throw an exception if it isn't a dir already?
##########
maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/checksum/CompactFileTrustedChecksumsSource.java:
##########
@@ -0,0 +1,166 @@
+package org.eclipse.aether.internal.impl.checksum;
+
+/*
+ * 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.
+ */
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
+import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.repository.ArtifactRepository;
+import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
+import org.eclipse.aether.util.artifact.ArtifactIdUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Compact file {@link FileTrustedChecksumsSourceSupport} implementation that
use specified directory as base
+ * directory, where it expects a "summary" file named as
"checksums.${checksumExt}" for each checksum algorithm, and
+ * file format is artifact ID and checksum separated by space per line. The
format supports comments "#" (hash) and
+ * empty lines (both are ignored).
+ * <p>
+ * The source may be configured to be "origin aware", in that case it will
factor in origin repository ID as well into
+ * file name (for example "central-checksums.sha1").
+ * <p>
+ * The name of this implementation is "file-compact".
+ *
+ * @since TBD
+ */
+@Singleton
+@Named( CompactFileTrustedChecksumsSource.NAME )
+public final class CompactFileTrustedChecksumsSource
+ extends FileTrustedChecksumsSourceSupport
+{
+ public static final String NAME = "file-compact";
+
+ private static final String CHECKSUM_FILE_PREFIX = "checksums.";
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(
CompactFileTrustedChecksumsSource.class );
+
+ private final ConcurrentHashMap<Path, ConcurrentHashMap<String,
ConcurrentHashMap<String, String>>> checksumCache;
+
+ @Inject
+ public CompactFileTrustedChecksumsSource()
+ {
+ super( NAME );
+ this.checksumCache = new ConcurrentHashMap<>();
+ }
+
+ @Override
+ protected Map<String, String> performLookup( RepositorySystemSession
session,
+ Path basedir,
+ Artifact artifact,
+ ArtifactRepository
artifactRepository,
+
List<ChecksumAlgorithmFactory> checksumAlgorithmFactories )
+ {
+ final HashMap<String, String> checksums = new HashMap<>();
+ final ConcurrentHashMap<String, ConcurrentHashMap<String, String>>
baseDirProvidedHashes = checksumCache
+ .computeIfAbsent( basedir, b -> new ConcurrentHashMap<>() );
+ final String prefix;
+ if ( isOriginAware( session ) )
+ {
+ if ( artifactRepository != null )
+ {
+ prefix = artifactRepository.getId() + "-" +
CHECKSUM_FILE_PREFIX;
+ }
+ else
+ {
+ prefix = session.getLocalRepository().getId() + "-" +
CHECKSUM_FILE_PREFIX;
+ }
+ }
+ else
+ {
+ prefix = CHECKSUM_FILE_PREFIX;
+ }
+
+ for ( ChecksumAlgorithmFactory checksumAlgorithmFactory :
checksumAlgorithmFactories )
+ {
+ ConcurrentHashMap<String, String> algorithmHashes =
baseDirProvidedHashes.computeIfAbsent(
Review Comment:
algorithmChecksums
##########
maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/checksum/FileTrustedChecksumsSourceSupport.java:
##########
@@ -0,0 +1,149 @@
+package org.eclipse.aether.internal.impl.checksum;
+
+/*
+ * 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.
+ */
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.repository.ArtifactRepository;
+import org.eclipse.aether.spi.checksums.TrustedChecksumsSource;
+import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
+import org.eclipse.aether.util.ConfigUtils;
+import org.eclipse.aether.util.DirectoryUtils;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * Support class for implementing {@link TrustedChecksumsSource} backed by
local filesystem. It implements basic support
+ * like bqsedir calculation, "enabled" flag and "originAware" flag.
+ * <p>
+ * The configuration keys supported:
+ * <ul>
+ * <li><pre>aether.trustedChecksumsSource.${name}.enabled</pre> (boolean)
must be explicitly set to "true"
+ * to become enabled</li>
+ * <li><pre>aether.trustedChecksumsSource.${name}.basedir</pre> (string,
path) directory from where implementation
+ * can use files. If unset, default value is ".checksums" and is resolved
from local repository basedir.</li>
Review Comment:
Docs should state, relative or absolute or both.
##########
maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/checksum/SparseFileTrustedChecksumsSource.java:
##########
@@ -0,0 +1,128 @@
+package org.eclipse.aether.internal.impl.checksum;
+
+/*
+ * 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.
+ */
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.internal.impl.LocalPathComposer;
+import org.eclipse.aether.repository.ArtifactRepository;
+import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
+import org.eclipse.aether.spi.io.FileProcessor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * Sparse file {@link FileTrustedChecksumsSourceSupport} implementation that
use specified directory as base
+ * directory, where it expects artifacts checksums on standard Maven2 "local"
layout. This implementation uses Artifact
+ * coordinates solely to form path from baseDir, pretty much as Maven local
repository does.
Review Comment:
basedir
> Allow more compact storage of provided checksums
> ------------------------------------------------
>
> Key: MRESOLVER-269
> URL: https://issues.apache.org/jira/browse/MRESOLVER-269
> Project: Maven Resolver
> Issue Type: Improvement
> Components: Resolver
> Reporter: Rafael Winterhalter
> Assignee: Tamás Cservenák
> Priority: Major
> Fix For: resolver-next
>
>
> While the repository layout makes sense for storage outside of a project, it
> would be more convenient to store checksums in a single file (per algorithm)
> when keeping checksums along when storing these checksums within a project.
> This makes the storage easier to version control and avoids the overhead of
> storing a lot of files in version control what often creates some overhead.
> Ideally, Maven could support such files out of the box by shipping a provider
> for such files.
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