add explicit message deser to all s3 errors (#3237)

Author: lucix-aws

.changelog/e31d33192a6d40c8a4bbf75347e17435.json

@@ -0,0 +1,8 @@
+{
+    "id": "e31d3319-2a6d-40c8-a4bb-f75347e17435",
+    "type": "bugfix",
+    "description": "Fix missing error message when service returns a specific type of error.",
+    "modules": [
+        "service/s3"
+    ]
+}

codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/customization/service/s3/S3AddErrorMessage.java

@@ -0,0 +1,32 @@
+package software.amazon.smithy.aws.go.codegen.customization.service.s3;
+
+import software.amazon.smithy.go.codegen.GoSettings;
+import software.amazon.smithy.go.codegen.integration.GoIntegration;
+import software.amazon.smithy.model.Model;
+import software.amazon.smithy.model.shapes.Shape;
+import software.amazon.smithy.model.shapes.ShapeId;
+import software.amazon.smithy.model.shapes.StructureShape;
+import software.amazon.smithy.model.traits.ErrorTrait;
+import software.amazon.smithy.model.transform.ModelTransformer;
+
+public class S3AddErrorMessage implements GoIntegration {
+    @Override
+    public Model preprocessModel(Model model, GoSettings settings) {
+        if (!S3ModelUtils.isServiceS3(model, settings.getService(model))) {
+            return model;
+        }
+
+        return ModelTransformer.create()
+                .mapShapes(model, (shape) ->
+                        shape.hasTrait(ErrorTrait.class)
+                                ? withMessage(shape)
+                                : shape
+                );
+    }
+
+    private static Shape withMessage(Shape shape) {
+        return ((StructureShape) shape).toBuilder()
+                .addMember("Message", ShapeId.from("com.amazonaws.s3#Message"))
+                .build();
+    }
+}

codegen/smithy-aws-go-codegen/src/main/resources/META-INF/services/software.amazon.smithy.go.codegen.integration.GoIntegration

@@ -93,3 +93,4 @@ software.amazon.smithy.aws.go.codegen.customization.SraOperationOrderTest
 software.amazon.smithy.aws.go.codegen.customization.RemoveOperations
 software.amazon.smithy.aws.go.codegen.customization.RetryInterceptors
 software.amazon.smithy.aws.go.codegen.customization.service.BearerTokenEnvProvider
+software.amazon.smithy.aws.go.codegen.customization.service.s3.S3AddErrorMessage