mthmulders commented on code in PR #995: URL: https://github.com/apache/maven/pull/995#discussion_r1115676030
########## maven-embedder/src/main/java/org/apache/maven/cli/RemoteRepositoryConnectionVerifier.java: ########## @@ -0,0 +1,130 @@ +/* + * 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 org.apache.maven.cli; + +import java.net.URI; +import java.util.Optional; + +import org.apache.commons.lang3.StringUtils; +import org.apache.maven.RepositoryUtils; +import org.apache.maven.artifact.repository.ArtifactRepository; +import org.codehaus.plexus.PlexusContainer; +import org.codehaus.plexus.component.repository.exception.ComponentLookupException; +import org.eclipse.aether.RepositorySystemSession; +import org.eclipse.aether.artifact.Artifact; +import org.eclipse.aether.repository.RemoteRepository; +import org.eclipse.aether.spi.connector.transport.GetTask; +import org.eclipse.aether.spi.connector.transport.Transporter; +import org.eclipse.aether.spi.connector.transport.TransporterProvider; +import org.eclipse.aether.transfer.NoTransporterException; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Helper class to verify connection to a remote repository. + */ +public class RemoteRepositoryConnectionVerifier { + private static final Artifact APACHE_MAVEN_ARTIFACT = MavenStatusCommand.APACHE_MAVEN_ARTIFACT; + private final Logger logger; + private final TransporterProvider transporterProvider; + + public RemoteRepositoryConnectionVerifier(final PlexusContainer container) throws ComponentLookupException { + this.logger = LoggerFactory.getILoggerFactory().getLogger(RemoteRepositoryConnectionVerifier.class.getName()); + this.transporterProvider = container.lookup(TransporterProvider.class); + } + + private boolean isCentralOrMirrorOfCentral(final RemoteRepository remoteRepository) { + return "central".equals(remoteRepository.getId()) + || remoteRepository.getMirroredRepositories().stream() + .map(RemoteRepository::getId) + .anyMatch("central"::equals); + } + + public Optional<String> verifyConnectionToRemoteRepository( + final RepositorySystemSession session, final ArtifactRepository artifactRepository) { + final RemoteRepository repository = RepositoryUtils.toRepo(artifactRepository); + + final String artifactPath; + + if (isCentralOrMirrorOfCentral(repository)) { + // We can be sure the Apache Maven artifact should be resolvable. + artifactPath = artifactRepository.getLayout().pathOf(RepositoryUtils.toArtifact(APACHE_MAVEN_ARTIFACT)); + } else { + // We cannot be sure about any artifact that lives here. + artifactPath = ""; + } + + try { + final Transporter transporter = transporterProvider.newTransporter(session, repository); + final Optional<String> maybeIssue = verifyConnectionUsingTransport(transporter, repository, artifactPath); + + if (!maybeIssue.isPresent()) { + logger.info("Connection check for {} [{}] completed", repository.getId(), repository.getUrl()); + } + + return maybeIssue; + } catch (final NoTransporterException nte) { + final String message = String.format( + "There is no compatible transport for remote repository %s with location %s", + repository.getId(), repository.getUrl()); + return Optional.of(message); + } + } + + private Optional<String> verifyConnectionUsingTransport( + final Transporter transporter, final RemoteRepository remoteRepository, final String artifactPath) { + try { + final GetTask task = new GetTask(URI.create(artifactPath)); + transporter.get(task); + return Optional.empty(); + } catch (final Exception e) { + return classifyException(remoteRepository, e); + } + } + + private Optional<String> classifyException(final RemoteRepository remoteRepository, final Exception e) { + final String message = e.getMessage(); + final String repositoryId = remoteRepository.getId(); + final String repositoryUrl = remoteRepository.getUrl(); + final String repository = String.format("%s [%s]", repositoryId, repositoryUrl); + + final boolean notFound = StringUtils.contains(message, "status code: 404"); + final boolean unauthorized = StringUtils.contains(message, "status code: 401"); + final boolean forbidden = StringUtils.contains(message, "status code: 403"); Review Comment: We now use [`transport#classify()`](https://maven.apache.org/resolver/apidocs/org/eclipse/aether/spi/connector/transport/Transporter.html#classify(java.lang.Throwable)). It does not provide a lot of detail, but it's transport-agnostic AFAICS, which is definitely a plus. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@maven.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
