Adds S3CrossRegion clients and codegen for retrieving bucket name (#4008)

* Adds S3CrossRegion clients and codegen for retrieving bucket name

* Removes codegen of bucket parameter since getValueForField() is better

* Add back overloads

Author: cenedhryn

services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/crossregion/S3CrossRegionAsyncClient.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package software.amazon.awssdk.services.s3.internal.crossregion;
+
+import java.util.Optional;
+import java.util.function.Function;
+import software.amazon.awssdk.annotations.SdkInternalApi;
+import software.amazon.awssdk.services.s3.DelegatingS3AsyncClient;
+import software.amazon.awssdk.services.s3.S3AsyncClient;
+import software.amazon.awssdk.services.s3.model.S3Request;
+
+@SdkInternalApi
+public final class S3CrossRegionAsyncClient extends DelegatingS3AsyncClient {
+
+    public S3CrossRegionAsyncClient(S3AsyncClient s3Client) {
+        super(s3Client);
+    }
+
+    @Override
+    protected <T extends S3Request, ReturnT> ReturnT invokeOperation(T request, Function<T, ReturnT> operation) {
+        Optional<String> bucket = request.getValueForField("bucket", String.class);
+
+        if (!bucket.isPresent()) {
+            return operation.apply(request);
+        }
+
+        //TODO: add modifyRequest logic
+        return operation.apply(request);
+    }
+
+    private void handleOperationFailure(Throwable t, String bucket) {
+        //TODO: handle failure case
+    }
+}

services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/crossregion/S3CrossRegionSyncClient.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package software.amazon.awssdk.services.s3.internal.crossregion;
+
+import java.util.Optional;
+import java.util.function.Function;
+import software.amazon.awssdk.annotations.SdkInternalApi;
+import software.amazon.awssdk.services.s3.DelegatingS3Client;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.model.S3Request;
+
+@SdkInternalApi
+public final class S3CrossRegionSyncClient extends DelegatingS3Client {
+
+    public S3CrossRegionSyncClient(S3Client s3Client) {
+        super(s3Client);
+    }
+
+    @Override
+    protected <T extends S3Request, ReturnT> ReturnT invokeOperation(T request, Function<T, ReturnT> operation) {
+        Optional<String> bucket = request.getValueForField("bucket", String.class);
+
+        if (bucket.isPresent()) {
+            try {
+                operation.apply(request); //TODO: add modifyRequest logic
+            } catch (Exception e) {
+                handleOperationFailure(e, bucket.get());
+            }
+        }
+
+        return operation.apply(request);
+    }
+
+    private void handleOperationFailure(Throwable t, String bucket) {
+        //TODO: handle failure case
+    }
+}