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Add utility to create layer for compressed directory #336

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Add utility to create layer for compressed directory #336

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15 changes: 15 additions & 0 deletions src/main/java/land/oras/Layer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -182,6 +182,21 @@ public static Layer fromData(ContainerRef containerRef, byte[] data) {
Map.of());
}

/**
* Create a layer from a compressed directory data (use gzip compression for unpacked directories)
* @param containerRef The container reference
* @param data The data
* @return The layer
*/
public static Layer fromCompressedDirectory(ContainerRef containerRef, byte[] data) {
return new Layer(
Const.DEFAULT_BLOB_DIR_MEDIA_TYPE,
containerRef.getAlgorithm().digest(data),
data.length,
Base64.getEncoder().encodeToString(data),
Map.of(Const.ANNOTATION_ORAS_UNPACK, "true"));
}

/**
* Create a layer from a digest
* @param digest The digest
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14 changes: 14 additions & 0 deletions src/test/java/land/oras/LayerTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@

import java.nio.file.Files;
import java.nio.file.Path;
import land.oras.utils.Const;
import land.oras.utils.SupportedAlgorithm;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;
Expand Down Expand Up @@ -69,6 +70,19 @@ void shouldReadLayerFromFile() throws Exception {
assertEquals(2, layer.getSize());
}

@Test
void shouldCreateLayerForCompressedDir() {
ContainerRef containerRef = ContainerRef.parse("test/container:latest");
byte[] data = "test".getBytes(); // We don't really care about the content here
Layer layer = Layer.fromCompressedDirectory(containerRef, data);
assertEquals("application/vnd.oci.image.layer.v1.tar+gzip", layer.getMediaType());
assertEquals("sha256:9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08", layer.getDigest());

// Ensure unpack annotations is set
assertEquals(1, layer.getAnnotations().size());
assertEquals("true", layer.getAnnotations().get(Const.ANNOTATION_ORAS_UNPACK));
}

@Test
void shouldHaveEmptyLayer() {
String json = emptyLayer();
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