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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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.
package com.google.devtools.build.workspace.maven;
import com.google.common.base.Joiner;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.google.devtools.build.lib.bazel.repository.MavenConnector;
import org.apache.maven.model.Parent;
import org.apache.maven.model.Repository;
import org.apache.maven.model.building.ModelSource;
import org.apache.maven.model.building.UrlModelSource;
import org.apache.maven.model.resolution.ModelResolver;
import org.apache.maven.model.resolution.UnresolvableModelException;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Resolver to find the repository a given Maven artifact should be fetched
* from.
*/
public class DefaultModelResolver implements ModelResolver {
private final Set<Repository> repositories;
private final Map<String, ModelSource> artifactToUrl;
public DefaultModelResolver() {
repositories = Sets.newHashSet();
repositories.add(MavenConnector.getMavenCentral());
artifactToUrl = Maps.newHashMap();
}
private DefaultModelResolver(
Set<Repository> repositories, Map<String, ModelSource> artifactToRepository) {
this.repositories = repositories;
this.artifactToUrl = artifactToRepository;
}
@Override
public ModelSource resolveModel(String groupId, String artifactId, String version)
throws UnresolvableModelException {
String artifact = Rule.name(groupId, artifactId);
if (artifactToUrl.containsKey(artifact)) {
return artifactToUrl.get(artifact);
}
for (Repository repository : repositories) {
UrlModelSource modelSource = getModelSource(
repository.getUrl(), groupId, artifactId, version);
if (modelSource != null) {
return modelSource;
}
}
// TODO(kchodorow): use Java 8 features to make this a one-liner.
List<String> urls = Lists.newArrayList();
for (Repository repository : repositories) {
urls.add(repository.getUrl());
}
throw new UnresolvableModelException("Could not find any repositories that knew how to "
+ "resolve " + groupId + ":" + artifactId + ":" + version + " (checked "
+ Joiner.on(", ").join(urls) + ")", groupId, artifactId, version);
}
// TODO(kchodorow): make this work with local repositories.
private UrlModelSource getModelSource(
String url, String groupId, String artifactId, String version)
throws UnresolvableModelException {
try {
if (!url.endsWith("/")) {
url += "/";
}
URL urlUrl = new URL(url
+ groupId.replaceAll("\\.", "/") + "/" + artifactId + "/" + version + "/" + artifactId
+ "-" + version + ".pom");
if (pomFileExists(urlUrl)) {
UrlModelSource urlModelSource = new UrlModelSource(urlUrl);
artifactToUrl.put(Rule.name(groupId, artifactId), urlModelSource);
return urlModelSource;
}
} catch (MalformedURLException e) {
throw new UnresolvableModelException("Bad URL " + url + ": " + e.getMessage(), groupId,
artifactId, version, e);
}
return null;
}
private boolean pomFileExists(URL url) {
try {
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("HEAD");
connection.setInstanceFollowRedirects(true);
connection.connect();
int code = connection.getResponseCode();
if (code == 200) {
return true;
}
} catch (IOException e) {
// Something went wrong, fall through.
}
return false;
}
public ModelSource resolveModel(Parent parent) throws UnresolvableModelException {
return resolveModel(parent.getGroupId(), parent.getArtifactId(), parent.getVersion());
}
@Override
public void addRepository(Repository repository) {
repositories.add(repository);
}
public void addRepository(Repository repository, boolean replace) {
addRepository(repository);
}
@Override
public ModelResolver newCopy() {
return new DefaultModelResolver(repositories, artifactToUrl);
}
/**
* Adds a user-specified repository to the list.
*/
public void addUserRepository(String url) {
Repository repository = new Repository();
repository.setUrl(url);
repository.setId("user-defined repository");
repository.setName("default");
addRepository(repository);
}
public boolean putModelSource(String groupId, String artifactId, ModelSource modelSource) {
String key = Rule.name(groupId, artifactId);
if (!artifactToUrl.containsKey(key)) {
artifactToUrl.put(key, modelSource);
return true;
}
return false;
}
}
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