feat(s3): add object annotations support

README.md

@@ -252,7 +252,7 @@ For operation-level compatibility, see the [Services Overview](https://floci.io/
 | SSM | In-process + EC2 containers | Parameter Store (version history, labels, SecureString, tagging); Run Command (SendCommand, GetCommandInvocation, direct EC2 container execution, agent polling) |
 | SQS | In-process | Standard and FIFO queues, DLQ, visibility timeout, batch operations, tagging |
 | SNS | In-process | Topics, subscriptions, SQS, Lambda and HTTP delivery, tagging |
-| S3 | In-process | Versioning, multipart upload, pre-signed URLs, Object Lock, event notifications |
+| S3 | In-process | Versioning, multipart upload, pre-signed URLs, Object Lock, object annotations, event notifications |
 | S3 Vectors | In-process | Vector buckets, indexes, put / get / list / delete vectors, cosine similarity queries |
 | DynamoDB | In-process | GSI, LSI, Query, Scan, TTL, transactions, batch operations; Streams with shard iterators and Lambda event source mapping |
 | Lambda | Real Docker | Runtime environment, execution model, warm container pool, aliases, Function URLs |

compatibility-tests/sdk-test-java/src/test/java/com/floci/test/S3AnnotationsTest.java

@@ -0,0 +1,224 @@
+package com.floci.test;
+
+import org.junit.jupiter.api.*;
+
+import software.amazon.awssdk.core.ResponseBytes;
+import software.amazon.awssdk.core.sync.RequestBody;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.model.AnnotationDirective;
+import software.amazon.awssdk.services.s3.model.AnnotationEntry;
+import software.amazon.awssdk.services.s3.model.BucketVersioningStatus;
+import software.amazon.awssdk.services.s3.model.ChecksumMode;
+import software.amazon.awssdk.services.s3.model.CreateBucketRequest;
+import software.amazon.awssdk.services.s3.model.GetObjectAnnotationResponse;
+import software.amazon.awssdk.services.s3.model.ListObjectAnnotationsRequest;
+import software.amazon.awssdk.services.s3.model.ListObjectAnnotationsResponse;
+import software.amazon.awssdk.services.s3.model.NoSuchAnnotationException;
+import software.amazon.awssdk.services.s3.model.PutBucketVersioningRequest;
+import software.amazon.awssdk.services.s3.model.PutObjectAnnotationRequest;
+import software.amazon.awssdk.services.s3.model.VersioningConfiguration;
+
+import static org.assertj.core.api.Assertions.*;
+
+@DisplayName("S3 Object Annotations")
+@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
+class S3AnnotationsTest {
+
+    private static S3Client s3;
+    private static final String BUCKET = "sdk-annotations-bucket";
+    private static final String KEY = "docs/annotated.txt";
+
+    @BeforeAll
+    static void setup() {
+        s3 = TestFixtures.s3Client();
+        s3.createBucket(CreateBucketRequest.builder().bucket(BUCKET).build());
+        s3.putObject(r -> r.bucket(BUCKET).key(KEY), RequestBody.fromString("annotated object body"));
+    }
+
+    @AfterAll
+    static void teardown() {
+        for (String key : new String[]{"docs/annotated.txt", "docs/annotated-copy.txt", "docs/annotated-copied.txt"}) {
+            try {
+                s3.deleteObject(r -> r.bucket(BUCKET).key(key));
+            } catch (Exception ignored) {
+            }
+        }
+        try {
+            s3.deleteBucket(r -> r.bucket(BUCKET));
+        } catch (Exception ignored) {
+        }
+    }
+
+    @Test
+    @Order(1)
+    void putObjectAnnotation() {
+        var response = s3.putObjectAnnotation(PutObjectAnnotationRequest.builder()
+                        .bucket(BUCKET)
+                        .key(KEY)
+                        .annotationName("classification")
+                        .build(),
+                RequestBody.fromString("{\"label\": \"report\"}"));
+
+        assertThat(response.key()).isEqualTo(KEY);
+        assertThat(response.annotationName()).isEqualTo("classification");
+        assertThat(response.eTag()).isNotBlank();
+        // CRC64NVME is the AWS default algorithm for annotations without an explicit one.
+        // The SDK computes a CRC32 payload checksum client-side by default and expects it echoed.
+        assertThat(response.checksumCRC32()).isNotBlank();
+        assertThat(response.checksumTypeAsString()).isEqualTo("FULL_OBJECT");
+    }
+
+    @Test
+    @Order(2)
+    void getObjectAnnotation() {
+        ResponseBytes<GetObjectAnnotationResponse> response = s3.getObjectAnnotationAsBytes(
+                r -> r.bucket(BUCKET).key(KEY).annotationName("classification").build());
+
+        assertThat(response.asUtf8String()).isEqualTo("{\"label\": \"report\"}");
+        assertThat(response.response().eTag()).isNotBlank();
+        assertThat(response.response().lastModified()).isNotNull();
+        assertThat(response.response().contentLength()).isEqualTo(19L);
+    }
+
+    @Test
+    @Order(3)
+    void getObjectAnnotationWithChecksumMode() {
+        ResponseBytes<GetObjectAnnotationResponse> response = s3.getObjectAnnotationAsBytes(
+                r -> r.bucket(BUCKET).key(KEY)
+                        .annotationName("classification")
+                        .checksumMode(ChecksumMode.ENABLED)
+                        .build());
+
+        assertThat(response.response().checksumCRC32()).isNotBlank();
+        assertThat(response.response().checksumTypeAsString()).isEqualTo("FULL_OBJECT");
+    }
+
+    @Test
+    @Order(4)
+    void listObjectAnnotations() {
+        s3.putObjectAnnotation(PutObjectAnnotationRequest.builder()
+                        .bucket(BUCKET).key(KEY).annotationName("summary")
+                        .build(),
+                RequestBody.fromString("summary text"));
+
+        ListObjectAnnotationsResponse response = s3.listObjectAnnotations(
+                ListObjectAnnotationsRequest.builder().bucket(BUCKET).key(KEY).build());
+
+        assertThat(response.bucket()).isEqualTo(BUCKET);
+        assertThat(response.key()).isEqualTo(KEY);
+        assertThat(response.annotationCount()).isEqualTo(2);
+        assertThat(response.annotations())
+                .extracting(AnnotationEntry::annotationName)
+                .containsExactly("classification", "summary");
+        assertThat(response.annotations())
+                .filteredOn(a -> "summary".equals(a.annotationName()))
+                .allSatisfy(a -> assertThat(a.size()).isEqualTo(12L));
+        assertThat(response.nextContinuationToken()).isNull();
+        assertThat(response.maxAnnotationResults()).isEqualTo(1000);
+    }
+
+    @Test
+    @Order(5)
+    void putObjectAnnotationWithChecksum() {
+        var response = s3.putObjectAnnotation(PutObjectAnnotationRequest.builder()
+                        .bucket(BUCKET).key(KEY).annotationName("hashed")
+                        .checksumAlgorithm(software.amazon.awssdk.services.s3.model.ChecksumAlgorithm.SHA256)
+                        .build(),
+                RequestBody.fromString("checksummed payload"));
+
+        assertThat(response.checksumSHA256()).isNotBlank();
+        assertThat(response.eTag()).isNotBlank();
+    }
+
+    @Test
+    @Order(6)
+    void getMissingAnnotationThrows() {
+        assertThatThrownBy(() -> s3.getObjectAnnotationAsBytes(r -> r.bucket(BUCKET).key(KEY)
+                        .annotationName("missing").build()))
+                .isInstanceOf(NoSuchAnnotationException.class);
+    }
+
+    @Test
+    @Order(7)
+    void deleteObjectAnnotationIsIdempotent() {
+        s3.deleteObjectAnnotation(r -> r.bucket(BUCKET).key(KEY).annotationName("hashed"));
+
+        assertThatThrownBy(() -> s3.getObjectAnnotationAsBytes(r -> r.bucket(BUCKET).key(KEY)
+                        .annotationName("hashed").build()))
+                .isInstanceOf(NoSuchAnnotationException.class);
+
+        // Deleting a nonexistent annotation is not an error.
+        assertThatCode(() -> s3.deleteObjectAnnotation(r -> r.bucket(BUCKET).key(KEY)
+                .annotationName("hashed"))).doesNotThrowAnyException();
+    }
+
+    @Test
+    @Order(8)
+    void copyObjectExcludeDirectiveSkipsAnnotations() {
+        s3.copyObject(r -> r.sourceBucket(BUCKET).sourceKey(KEY)
+                .destinationBucket(BUCKET).destinationKey("docs/annotated-copy.txt")
+                .annotationDirective(AnnotationDirective.EXCLUDE));
+
+        assertThatThrownBy(() -> s3.getObjectAnnotationAsBytes(r -> r.bucket(BUCKET)
+                        .key("docs/annotated-copy.txt").annotationName("classification").build()))
+                .isInstanceOf(NoSuchAnnotationException.class);
+    }
+
+    // ========== Versioned bucket behavior ==========
+
+    @Test
+    @Order(10)
+    void enableVersioning() {
+        s3.putBucketVersioning(r -> r.bucket(BUCKET)
+                .versioningConfiguration(VersioningConfiguration.builder()
+                        .status(BucketVersioningStatus.ENABLED)
+                        .build()));
+    }
+
+    @Test
+    @Order(11)
+    void annotationAttachesToSpecificVersion() {
+        s3.putObject(r -> r.bucket(BUCKET).key(KEY), RequestBody.fromString("version one"));
+        var v1 = s3.putObjectAnnotation(PutObjectAnnotationRequest.builder()
+                        .bucket(BUCKET).key(KEY).annotationName("v1-note")
+                        .build(),
+                RequestBody.fromString("on version one"));
+        assertThat(v1.objectVersionId()).isNotBlank();
+
+        s3.putObject(r -> r.bucket(BUCKET).key(KEY), RequestBody.fromString("version two"));
+
+        // The new version has no annotations; the old one's stay reachable by versionId.
+        assertThatThrownBy(() -> s3.getObjectAnnotationAsBytes(r -> r.bucket(BUCKET).key(KEY)
+                        .annotationName("v1-note").build()))
+                .isInstanceOf(NoSuchAnnotationException.class);
+
+        ResponseBytes<GetObjectAnnotationResponse> fromV1 = s3.getObjectAnnotationAsBytes(
+                r -> r.bucket(BUCKET).key(KEY)
+                        .annotationName("v1-note")
+                        .versionId(v1.objectVersionId())
+                        .build());
+        assertThat(fromV1.asUtf8String()).isEqualTo("on version one");
+        assertThat(fromV1.response().objectVersionId()).isEqualTo(v1.objectVersionId());
+    }
+
+    @Test
+    @Order(12)
+    void copyObjectCopiesAnnotationsByDefault() {
+        // The latest version (the copy source) must carry an annotation for the copy to take.
+        s3.putObjectAnnotation(PutObjectAnnotationRequest.builder()
+                        .bucket(BUCKET).key(KEY).annotationName("latest-note")
+                        .build(),
+                RequestBody.fromString("copied annotation"));
+        s3.copyObject(r -> r.sourceBucket(BUCKET).sourceKey(KEY)
+                .destinationBucket(BUCKET).destinationKey("docs/annotated-copied.txt"));
+
+        ResponseBytes<GetObjectAnnotationResponse> copied = s3.getObjectAnnotationAsBytes(
+                r -> r.bucket(BUCKET)
+                        .key("docs/annotated-copied.txt").annotationName("latest-note")
+                        .versionId(s3.headObject(b -> b.bucket(BUCKET).key("docs/annotated-copied.txt"))
+                                .versionId())
+                        .build());
+        assertThat(copied.asUtf8String()).isEqualTo("copied annotation");
+        s3.deleteObject(r -> r.bucket(BUCKET).key("docs/annotated-copied.txt"));
+    }
+}

docs/services/s3.md

@@ -13,6 +13,7 @@
 | **Multipart** | CreateMultipartUpload, UploadPart, CompleteMultipartUpload, AbortMultipartUpload, ListMultipartUploads |
 | **Versioning** | PutBucketVersioning, GetBucketVersioning |
 | **Tagging** | PutBucketTagging, GetBucketTagging, PutObjectTagging, GetObjectTagging, DeleteObjectTagging |
+| **Annotations** | PutObjectAnnotation, GetObjectAnnotation, ListObjectAnnotations, DeleteObjectAnnotation |
 | **Policy** | PutBucketPolicy, GetBucketPolicy, DeleteBucketPolicy |
 | **CORS** | PutBucketCors, GetBucketCors, DeleteBucketCors |
 | **Lifecycle** | PutBucketLifecycle, GetBucketLifecycle, DeleteBucketLifecycle |
@@ -38,6 +39,40 @@
 
 Browser and presigned POST uploads emit `s3:ObjectCreated:Post`, matching AWS S3. They do not emit
 `s3:ObjectCreated:Put`; use `s3:ObjectCreated:*` to subscribe to objects created by either method.
+Annotation changes emit `s3:ObjectAnnotation:Put` and `s3:ObjectAnnotation:Delete`.
+
+## Object Annotations
+
+Annotations are named UTF-8 text payloads (up to 1 MiB each, 1,000 per object version) attached to a
+specific object version through the four `?annotation` operations. Notes on the emulation:
+
+- Annotation names allow letters (any language), digits, `_`, `.`, and `-`; names longer than 512
+  bytes, empty or whitespace-only names, names with other characters, and names starting with `aws`
+  or `s3` (case-insensitive) are rejected.
+- Payloads must be valid UTF-8 text between 1 byte and 1 MiB; anything else is rejected with 400,
+  and non-UTF-8 payloads return 415 `UnsupportedMediaType`.
+- `x-amz-object-if-match` is validated against the parent object's ETag on put and delete.
+- Versioning semantics match AWS: annotations attach to one object version, new versions do not
+  inherit them, overwriting a non-versioned object or deleting it drops its annotations, a delete
+  marker preserves the underlying version's annotations, and deleting a specific version deletes
+  its annotations. Annotation deletion is permanent.
+- `CopyObject` copies annotations by default; the `x-amz-object-annotation-directive` header
+  (as the AWS SDK sends it; `x-amz-annotation-directive` is also accepted) set to `EXCLUDE`
+  skips them.
+- Checksums are per-annotation and independent of the object checksum. The default algorithm is
+  CRC64NVME. Supported: CRC32, CRC32C, CRC64NVME, SHA1, SHA256. SHA512, XXHASH64, XXHASH3, XXHASH128,
+  and MD5 are rejected as unsupported.
+- Annotations on SSE-C encrypted objects are rejected, as on AWS, and are not copied onto SSE-C
+  copy destinations.
+- Annotation operations serialize against object writes on the same bucket. On Object
+  Lock-protected versions, annotation put and delete follow the same rules as object delete:
+  governance retention requires `x-amz-bypass-governance-retention` (put never takes the bypass),
+  compliance and legal hold always block.
+- The literal `versionId=null` (as reported by ListObjectVersions for pre-versioning objects)
+  addresses the pre-versioning entry.
+- Annotations are stored per AWS account. With `globalBucketNamespace` enabled, object reads
+  resolve cross-account but annotation reads, writes, and listings stay in the caller's account.
+- S3 Metadata annotation tables and annotation replication are not implemented.
 
 ## Website Hosting
 

src/main/java/io/github/hectorvent/floci/services/cloudtrail/CloudTrailService.java

@@ -452,7 +452,8 @@ static boolean isReadOnlyEvent(String eventName) {
         if (eventName == null) return true;
         return switch (eventName) {
             case "GetObject", "HeadObject", "ListObjects", "ListObjectsV2",
-                 "GetObjectAcl", "GetObjectTagging", "ListMultipartUploads" -> true;
+                 "GetObjectAcl", "GetObjectTagging", "ListMultipartUploads",
+                 "GetObjectAnnotation", "ListObjectAnnotations" -> true;
             default -> false;
         };
     }