Do not pull layer without title on pull artifact

Signed-off-by: Valentin Delaye <jonesbusy@users.noreply.github.com>

Author: jonesbusy

src/main/java/land/oras/Registry.java

@@ -333,11 +333,16 @@ public void pullArtifact(ContainerRef containerRef, Path path, boolean overwrite
         // Only collect layer that are files
         String contentType = getContentType(ref);
         List<Layer> layers = collectLayers(ref, contentType, false);
-        if (layers.isEmpty()) {
+        if (layers.isEmpty()
+                || layers.stream().noneMatch(layer -> layer.getAnnotations().containsKey(Const.ANNOTATION_TITLE))) {
             LOG.info("Skipped pulling layers without file name in '{}'", Const.ANNOTATION_TITLE);
             return;
         }
         for (Layer layer : layers) {
+            if (!layer.getAnnotations().containsKey(Const.ANNOTATION_TITLE)) {
+                LOG.info("Skipped pulling layer without file name in '{}'", Const.ANNOTATION_TITLE);
+                continue;
+            }
             try (InputStream is = fetchBlob(ref.withDigest(layer.getDigest()))) {
                 // Unpack or just copy blob
                 if (Boolean.parseBoolean(layer.getAnnotations().getOrDefault(Const.ANNOTATION_ORAS_UNPACK, "false"))) {
@@ -360,8 +365,7 @@ public void pullArtifact(ContainerRef containerRef, Path path, boolean overwrite
                     ArchiveUtils.untar(Files.newInputStream(tempArchive.getPath()), path);
 
                 } else {
-                    Path targetPath = path.resolve(
-                            layer.getAnnotations().getOrDefault(Const.ANNOTATION_TITLE, layer.getDigest()));
+                    Path targetPath = path.resolve(layer.getAnnotations().get(Const.ANNOTATION_TITLE));
                     if (Files.exists(targetPath) && !overwrite) {
                         LOG.info("File already exists: {}", targetPath);
                         continue;

src/test/java/land/oras/HarborS3ITCase.java

@@ -205,7 +205,8 @@ void shouldPushJenkinsScriptArtifact() {
         ContainerRef containerRef = ContainerRef.parse("demo.goharbor.io/oras/jenkins-cps:latest");
         Config config = Config.empty();
         Layer layer = Layer.fromData(containerRef, jenkinsfile.getBytes(StandardCharsets.UTF_8))
-                .withMediaType(contentMediaType);
+                .withMediaType(contentMediaType)
+                .withAnnotations(Map.of(Const.ANNOTATION_TITLE, "Jenkinsfile"));
         Layer imageLayer = Layer.fromFile(image)
                 .withMediaType("image/png")
                 .withAnnotations(Map.of("io.goharbor.artifact.v1alpha1.icon", ""));

src/test/java/land/oras/RegistryTest.java

@@ -645,6 +645,62 @@ void shouldPushManifestWithRegistryUrl() {
         });
     }
 
+    @Test
+    void pullArtifactWithoutLayer() {
+        Registry registry = Registry.Builder.builder()
+                .defaults("myuser", "mypass")
+                .withInsecure(true)
+                .build();
+        ContainerRef containerRef1 = ContainerRef.parse("%s/empty-layers".formatted(this.registry.getRegistry()));
+        Config emptyConfig = Config.empty();
+        Manifest manifest1 = Manifest.empty().withConfig(emptyConfig);
+        registry.pushConfig(containerRef1, emptyConfig);
+        registry.pushManifest(containerRef1, manifest1);
+        assertDoesNotThrow(() -> {
+            registry.pullArtifact(containerRef1, artifactDir, true);
+        });
+    }
+
+    @Test
+    void pullArtifactShouldPullLayerWithTitleOnly() {
+        Registry registry = Registry.Builder.builder()
+                .defaults("myuser", "mypass")
+                .withInsecure(true)
+                .build();
+        ContainerRef containerRef1 = ContainerRef.parse("%s/empty-layers-title".formatted(this.registry.getRegistry()));
+        Config emptyConfig = Config.empty();
+        Manifest manifest1 = Manifest.empty().withConfig(emptyConfig);
+        Layer layer = registry.pushBlob(containerRef1, "hello".getBytes(StandardCharsets.UTF_8))
+                .withAnnotations(Map.of(Const.ANNOTATION_TITLE, "file.txt"));
+        Layer layerWithoutTitle = registry.pushBlob(containerRef1, "hello".getBytes(StandardCharsets.UTF_8));
+        manifest1 = manifest1.withLayers(List.of(layer, layerWithoutTitle));
+        registry.pushConfig(containerRef1, emptyConfig);
+        registry.pushManifest(containerRef1, manifest1);
+        assertDoesNotThrow(() -> {
+            registry.pullArtifact(containerRef1, artifactDir, true);
+        });
+    }
+
+    @Test
+    void pullArtifactShouldPullLayerWithNoTitle() {
+        Registry registry = Registry.Builder.builder()
+                .defaults("myuser", "mypass")
+                .withInsecure(true)
+                .build();
+        ContainerRef containerRef1 = ContainerRef.parse("%s/no-layers-title".formatted(this.registry.getRegistry()));
+        Config emptyConfig = Config.empty();
+        Manifest manifest1 = Manifest.empty().withConfig(emptyConfig);
+        Layer layer = registry.pushBlob(containerRef1, "hello".getBytes(StandardCharsets.UTF_8))
+                .withAnnotations(Map.of());
+        Layer layerWithoutTitle = registry.pushBlob(containerRef1, "hello".getBytes(StandardCharsets.UTF_8));
+        manifest1 = manifest1.withLayers(List.of(layer, layerWithoutTitle));
+        registry.pushConfig(containerRef1, emptyConfig);
+        registry.pushManifest(containerRef1, manifest1);
+        assertDoesNotThrow(() -> {
+            registry.pullArtifact(containerRef1, artifactDir, true);
+        });
+    }
+
     @Test
     void shouldPushComplexArtifactWithConfigMediaType() throws IOException {
         Registry registry = Registry.Builder.builder()