/*
    * 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.eclipse.aether.internal.impl.resolution;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.eclipse.aether.DefaultRepositorySystemSession;
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.artifact.DefaultArtifact;
  import org.eclipse.aether.internal.impl.checksum.Sha1ChecksumAlgorithmFactory;
  import org.eclipse.aether.internal.test.util.TestUtils;
  import org.eclipse.aether.repository.ArtifactRepository;
  import org.eclipse.aether.resolution.ArtifactRequest;
  import org.eclipse.aether.resolution.ArtifactResult;
  import org.eclipse.aether.spi.checksums.TrustedChecksumsSource;
  import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
  import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactorySelector;
  import org.eclipse.aether.util.artifact.ArtifactIdUtils;
  import org.junit.Before;
  import org.junit.Test;
  
  import static java.util.stream.Collectors.toList;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.containsString;
  import static org.hamcrest.Matchers.empty;
  import static org.hamcrest.Matchers.equalTo;
  import static org.hamcrest.Matchers.not;
  import static org.hamcrest.Matchers.notNullValue;
  
  /**
   * UT for {@link TrustedChecksumsArtifactResolverPostProcessor}.
   */
  public class TrustedChecksumsArtifactResolverPostProcessorTest implements TrustedChecksumsSource {
      private static final String TRUSTED_SOURCE_NAME = "test";
  
      private Artifact artifactWithoutTrustedChecksum;
  
      private Artifact artifactWithTrustedChecksum;
  
      private String artifactTrustedChecksum;
  
      protected DefaultRepositorySystemSession session;
  
      protected ChecksumAlgorithmFactory checksumAlgorithmFactory = new Sha1ChecksumAlgorithmFactory();
  
      private TrustedChecksumsArtifactResolverPostProcessor subject;
  
      private TrustedChecksumsSource.Writer trustedChecksumsWriter;
  
      @Before
      public void prepareSubject() throws IOException {
          Files.createDirectories(Paths.get(System.getProperty("java.io.tmpdir"))); // hack for Surefire
          // make the two artifacts, BOTH as resolved
          File tmp = Files.createTempFile("artifact", "tmp").toFile();
          artifactWithoutTrustedChecksum = new DefaultArtifact("test:test:1.0").setFile(tmp);
          artifactWithTrustedChecksum = new DefaultArtifact("test:test:2.0").setFile(tmp);
          artifactTrustedChecksum = "da39a3ee5e6b4b0d3255bfef95601890afd80709"; // empty file
  
          session = TestUtils.newSession();
          ChecksumAlgorithmFactorySelector selector = new ChecksumAlgorithmFactorySelector() {
              @Override
              public ChecksumAlgorithmFactory select(String algorithmName) {
                  if (checksumAlgorithmFactory.getName().equals(algorithmName)) {
                      return checksumAlgorithmFactory;
                  }
                  throw new IllegalArgumentException("no alg factory for " + algorithmName);
              }
  
              @Override
              public List<ChecksumAlgorithmFactory> selectList(Collection<String> algorithmNames) {
                  return algorithmNames.stream().map(this::select).collect(toList());
              }
  
              @Override
             public Collection<ChecksumAlgorithmFactory> getChecksumAlgorithmFactories() {
                 return Collections.singletonList(checksumAlgorithmFactory);
             }
 
             @Override
             public boolean isChecksumExtension(String extension) {
                 throw new RuntimeException("not implemented");
             }
         };
         subject = new TrustedChecksumsArtifactResolverPostProcessor(
                 selector, Collections.singletonMap(TRUSTED_SOURCE_NAME, this));
         trustedChecksumsWriter = null;
         session.setConfigProperty("aether.artifactResolver.postProcessor.trustedChecksums", Boolean.TRUE.toString());
     }
 
     // -- TrustedChecksumsSource interface BEGIN
 
     @Override
     public Map<String, String> getTrustedArtifactChecksums(
             RepositorySystemSession session,
             Artifact artifact,
             ArtifactRepository artifactRepository,
             List<ChecksumAlgorithmFactory> checksumAlgorithmFactories) {
         if (ArtifactIdUtils.toId(artifactWithTrustedChecksum).equals(ArtifactIdUtils.toId(artifact))) {
             return Collections.singletonMap(checksumAlgorithmFactory.getName(), artifactTrustedChecksum);
         } else {
             return Collections.emptyMap();
         }
     }
 
     @Override
     public Writer getTrustedArtifactChecksumsWriter(RepositorySystemSession session) {
         return trustedChecksumsWriter;
     }
 
     // -- TrustedChecksumsSource interface END
 
     private ArtifactResult createArtifactResult(Artifact artifact) {
         ArtifactResult artifactResult = new ArtifactResult(new ArtifactRequest().setArtifact(artifact));
         artifactResult.setArtifact(artifact);
         return artifactResult;
     }
 
     // UTs below
 
     @Test
     public void haveMatchingChecksumPass() {
         ArtifactResult artifactResult = createArtifactResult(artifactWithTrustedChecksum);
         assertThat(artifactResult.isResolved(), equalTo(true));
 
         subject.postProcess(session, Collections.singletonList(artifactResult));
         assertThat(artifactResult.isResolved(), equalTo(true));
     }
 
     @Test
     public void haveNoChecksumPass() {
         ArtifactResult artifactResult = createArtifactResult(artifactWithoutTrustedChecksum);
         assertThat(artifactResult.isResolved(), equalTo(true));
 
         subject.postProcess(session, Collections.singletonList(artifactResult));
         assertThat(artifactResult.isResolved(), equalTo(true));
     }
 
     @Test
     public void haveNoChecksumFailIfMissingEnabledFail() {
         session.setConfigProperty(
                 "aether.artifactResolver.postProcessor.trustedChecksums.failIfMissing", Boolean.TRUE.toString());
         ArtifactResult artifactResult = createArtifactResult(artifactWithoutTrustedChecksum);
         assertThat(artifactResult.isResolved(), equalTo(true));
 
         subject.postProcess(session, Collections.singletonList(artifactResult));
         assertThat(artifactResult.isResolved(), equalTo(false));
         assertThat(artifactResult.getExceptions(), not(empty()));
         assertThat(
                 artifactResult.getExceptions().get(0).getMessage(),
                 containsString("Missing from " + TRUSTED_SOURCE_NAME + " trusted"));
     }
 
     @Test
     public void haveMismatchingChecksumFail() {
         artifactTrustedChecksum = "foobar";
         ArtifactResult artifactResult = createArtifactResult(artifactWithTrustedChecksum);
         assertThat(artifactResult.isResolved(), equalTo(true));
 
         subject.postProcess(session, Collections.singletonList(artifactResult));
         assertThat(artifactResult.isResolved(), equalTo(false));
         assertThat(artifactResult.getExceptions(), not(empty()));
         assertThat(artifactResult.getExceptions().get(0).getMessage(), containsString("trusted checksum mismatch"));
         assertThat(
                 artifactResult.getExceptions().get(0).getMessage(),
                 containsString(TRUSTED_SOURCE_NAME + "=" + artifactTrustedChecksum));
     }
 
     @Test
     public void recordCalculatedChecksum() {
         AtomicReference<String> recordedChecksum = new AtomicReference<>(null);
         this.trustedChecksumsWriter = new Writer() {
             @Override
             public void addTrustedArtifactChecksums(
                     Artifact artifact,
                     ArtifactRepository artifactRepository,
                     List<ChecksumAlgorithmFactory> checksumAlgorithmFactories,
                     Map<String, String> trustedArtifactChecksums) {
                 recordedChecksum.set(trustedArtifactChecksums.get(checksumAlgorithmFactory.getName()));
             }
         };
         session.setConfigProperty(
                 "aether.artifactResolver.postProcessor.trustedChecksums.record", Boolean.TRUE.toString());
         ArtifactResult artifactResult = createArtifactResult(artifactWithTrustedChecksum);
         assertThat(artifactResult.isResolved(), equalTo(true));
 
         subject.postProcess(session, Collections.singletonList(artifactResult));
         assertThat(artifactResult.isResolved(), equalTo(true));
 
         String checksum = recordedChecksum.get();
         assertThat(checksum, notNullValue());
         assertThat(checksum, equalTo(artifactTrustedChecksum));
     }
 }