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19 package org.eclipse.aether.generator.sigstore;
20
21 import java.io.IOException;
22 import java.io.UncheckedIOException;
23 import java.nio.file.Files;
24 import java.nio.file.Path;
25 import java.security.GeneralSecurityException;
26 import java.security.cert.X509Certificate;
27 import java.time.temporal.ChronoUnit;
28 import java.util.ArrayList;
29 import java.util.Collection;
30 import java.util.Collections;
31 import java.util.function.Predicate;
32
33 import dev.sigstore.KeylessSigner;
34 import dev.sigstore.KeylessSignerException;
35 import dev.sigstore.bundle.Bundle;
36 import dev.sigstore.encryption.certificates.Certificates;
37 import org.eclipse.aether.artifact.Artifact;
38 import org.eclipse.aether.generator.sigstore.internal.FulcioOidHelper;
39 import org.eclipse.aether.spi.artifact.generator.ArtifactGenerator;
40 import org.eclipse.aether.spi.io.PathProcessor;
41 import org.eclipse.aether.util.artifact.SubArtifact;
42 import org.slf4j.Logger;
43 import org.slf4j.LoggerFactory;
44
45 final class SigstoreSignatureArtifactGenerator implements ArtifactGenerator {
46 private static final String ARTIFACT_EXTENSION = ".sigstore.json";
47 private final Logger logger = LoggerFactory.getLogger(getClass());
48 private final PathProcessor pathProcessor;
49 private final ArrayList<Artifact> artifacts;
50 private final Predicate<Artifact> signableArtifactPredicate;
51 private final boolean publicStaging;
52 private final ArrayList<Path> signatureTempFiles;
53
54 SigstoreSignatureArtifactGenerator(
55 PathProcessor pathProcessor,
56 Collection<Artifact> artifacts,
57 Predicate<Artifact> signableArtifactPredicate,
58 boolean publicStaging) {
59 this.pathProcessor = pathProcessor;
60 this.artifacts = new ArrayList<>(artifacts);
61 this.signableArtifactPredicate = signableArtifactPredicate;
62 this.publicStaging = publicStaging;
63 this.signatureTempFiles = new ArrayList<>();
64 logger.debug("Created sigstore generator (publicStaging={})", publicStaging);
65 }
66
67 @Override
68 public String generatorId() {
69 return SigstoreSignatureArtifactGeneratorFactory.NAME;
70 }
71
72 @Override
73 public Collection<? extends Artifact> generate(Collection<? extends Artifact> generatedArtifacts) {
74 try {
75 artifacts.addAll(generatedArtifacts);
76
77
78 if (artifacts.stream().anyMatch(a -> a.getExtension().endsWith(ARTIFACT_EXTENSION))) {
79 logger.debug("Sigstore signatures are present among artifacts, bailing out");
80 return Collections.emptyList();
81 }
82
83
84 ArrayList<Artifact> result = new ArrayList<>();
85 ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
86 Thread.currentThread().setContextClassLoader(KeylessSigner.class.getClassLoader());
87 try (KeylessSigner signer = publicStaging
88 ? KeylessSigner.builder().sigstoreStagingDefaults().build()
89 : KeylessSigner.builder().sigstorePublicDefaults().build()) {
90 for (Artifact artifact : artifacts) {
91 if (signableArtifactPredicate.test(artifact)) {
92 Path fileToSign = artifact.getPath();
93 Path signatureTempFile = Files.createTempFile("signer-sigstore", "tmp");
94 signatureTempFiles.add(signatureTempFile);
95
96 logger.debug("Signing " + artifact);
97 long start = System.currentTimeMillis();
98 Bundle bundle = signer.signFile(fileToSign);
99
100 X509Certificate cert = (X509Certificate)
101 bundle.getCertPath().getCertificates().get(0);
102 long durationMinutes = Certificates.validity(cert, ChronoUnit.MINUTES);
103
104 logger.debug(" Fulcio certificate (valid for "
105 + durationMinutes
106 + " m) obtained for "
107 + cert.getSubjectAlternativeNames()
108 .iterator()
109 .next()
110 .get(1)
111 + " (by "
112 + FulcioOidHelper.getIssuerV2(cert)
113 + " IdP)");
114
115 pathProcessor.write(signatureTempFile, bundle.toJson());
116
117 long duration = System.currentTimeMillis() - start;
118 logger.debug(" > Rekor entry "
119 + bundle.getEntries().get(0).getLogIndex()
120 + " obtained in "
121 + duration
122 + " ms, saved to "
123 + signatureTempFile);
124
125 result.add(new SubArtifact(
126 artifact,
127 artifact.getClassifier(),
128 artifact.getExtension() + ARTIFACT_EXTENSION,
129 signatureTempFile.toFile()));
130 }
131 }
132 } finally {
133 Thread.currentThread().setContextClassLoader(originalClassLoader);
134 }
135 logger.info("Signed {} artifacts with Sigstore", result.size());
136 return result;
137 } catch (GeneralSecurityException e) {
138 throw new IllegalArgumentException("Preparation problem", e);
139 } catch (KeylessSignerException e) {
140 throw new IllegalStateException("Processing problem", e);
141 } catch (IOException e) {
142 throw new UncheckedIOException("IO problem", e);
143 }
144 }
145
146 @Override
147 public void close() {
148 signatureTempFiles.forEach(p -> {
149 try {
150 Files.deleteIfExists(p);
151 } catch (IOException e) {
152 p.toFile().deleteOnExit();
153 }
154 });
155 }
156 }