Fix v1 S3 getUserMetaDataOf transform

.changes/next-release/bugfix-AWSSDKforJavav2MigrationTool-370c8cd.json

@@ -0,0 +1,6 @@
+{
+    "type": "bugfix",
+    "category": "AWS SDK for Java v2 Migration Tool",
+    "contributor": "",
+    "description": "Fix bug for v1 getUserMetaDataOf transform"
+}

test/v2-migration-tests/src/test/resources/software/amazon/awssdk/v2migrationtests/maven/after/src/main/java/foo/bar/S3Streaming.java

@@ -50,6 +50,8 @@ void getObject(String bucket, String key, File file) throws Exception {
 
         String etag = /*AWS SDK for Java v2 migration: NOTE: V2's eTag() preserves surrounding quotes in the response, whereas V1's getETag() strips them - https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/migration-s3-client.html#V1s-ObjectMetadata-using-V1s-getETag*/
 objectMetadata.eTag().replaceAll("^\"|\"$", "");
+
+        String value = s3Object.response().metadata().get("key");
     }
 
     void putObject_bucketKeyContent(String bucket, String key, String content) {

test/v2-migration-tests/src/test/resources/software/amazon/awssdk/v2migrationtests/maven/before/src/main/java/foo/bar/S3Streaming.java

@@ -45,6 +45,8 @@ void getObject(String bucket, String key, File file) throws Exception {
         ObjectMetadata objectMetadata = s3.getObject(new GetObjectRequest(bucket, key), file);
 
         String etag = objectMetadata.getETag();
+
+        String value = s3Object.getObjectMetadata().getUserMetaDataOf("key");
     }
 
     void putObject_bucketKeyContent(String bucket, String key, String content) {

v2-migration/src/main/java/software/amazon/awssdk/v2migration/S3PutObjectRequestToV2.java

@@ -420,6 +420,9 @@ private Expression retrieveContentLengthForMetadataIfSet(String metadataName) {
         }
 
         private J.MethodInvocation saveMetadataValueAndRemoveStatement(J.MethodInvocation method) {
+            if (!(method.getSelect() instanceof J.Identifier)) {
+                return method;
+            }
             J.Identifier metadataPojo = (J.Identifier) method.getSelect();
             String variableName = metadataPojo.getSimpleName();
 

v2-migration/src/main/java/software/amazon/awssdk/v2migration/V1GetterToV2.java

@@ -17,7 +17,9 @@
 
 import static software.amazon.awssdk.v2migration.internal.utils.S3TransformUtils.changeBucketNameToBucket;
 import static software.amazon.awssdk.v2migration.internal.utils.S3TransformUtils.isS3ETagGetter;
+import static software.amazon.awssdk.v2migration.internal.utils.S3TransformUtils.isS3UserMetaDataOfGetter;
 import static software.amazon.awssdk.v2migration.internal.utils.S3TransformUtils.transformETagGetter;
+import static software.amazon.awssdk.v2migration.internal.utils.S3TransformUtils.transformUserMetaDataOfGetter;
 import static software.amazon.awssdk.v2migration.internal.utils.SdkTypeUtils.isV2ModelClass;
 
 import org.openrewrite.ExecutionContext;
@@ -69,6 +71,10 @@ public J.MethodInvocation visitMethodInvocation(J.MethodInvocation method, Execu
                 return transformETagGetter(getCursor(), method);
             }
 
+            if (isS3UserMetaDataOfGetter(methodName, fullyQualified)) {
+                return transformUserMetaDataOfGetter(getCursor(), method);
+            }
+
             methodName = changeBucketNameToBucket(methodName);
 
             if (NamingUtils.isGetter(methodName)) {

v2-migration/src/main/java/software/amazon/awssdk/v2migration/internal/utils/S3TransformUtils.java

@@ -315,6 +315,18 @@ public static J.MethodInvocation transformETagGetter(Cursor cursor, J.MethodInvo
                            .withComments(createCommentsWithNewline(comment));
     }
 
+    public static boolean isS3UserMetaDataOfGetter(String methodName, JavaType.FullyQualified declaringType) {
+        return "getUserMetaDataOf".equals(methodName)
+               && declaringType.getFullyQualifiedName().startsWith(V2_S3_MODEL_PKG);
+    }
+
+    public static J.MethodInvocation transformUserMetaDataOfGetter(Cursor cursor, J.MethodInvocation method) {
+        String template = "#{any()}.metadata().get(#{any()})";
+        return JavaTemplate.builder(template).build()
+                           .apply(cursor, method.getCoordinates().replace(),
+                                  method.getSelect(), method.getArguments().get(0));
+    }
+
     public static List<Comment> inputStreamBufferingWarningComment() {
         String warning = "When using InputStream to upload with S3Client, Content-Length should be specified and used "
                          + "with RequestBody.fromInputStream(). Otherwise, the entire stream will be buffered in memory. If"