Expand valid targets of httpPayload

This commit updates the httpPayload trait to allow targeting a structure
member that targets any type. Documentation is updated to clarify how the
values of other types are serialized.

AWS protocol support for new types of httpPayload marked member targets
is unchanged.

docs/source-1.0/spec/core/http-traits.rst

@@ -707,13 +707,9 @@ the body of the response.
 Summary
     Binds a single structure member to the body of an HTTP message.
 Trait selector
-    .. code-block:: none
-
-        structure > :test(member > :test(string, blob, structure, union, document, list, set, map))
+    ``structure > member``
 
-    The ``httpPayload`` trait can be applied to ``structure`` members that
-    target a ``string``, ``blob``, ``structure``, ``union``, ``document``,
-    ``set``, ``map``, or ``list``.
+    *Any structure member*
 Value type
     Annotation trait.
 Conflicts with
@@ -775,12 +771,12 @@ or :ref:`httpPrefixHeaders-trait`.
 
 .. rubric:: Serialization rules
 
-#. When a string or blob member is referenced, the raw value is serialized
-   as the body of the message.
 #. When a :ref:`structure <structure>`, :ref:`union <union>`, :ref:`list <list>`,
    :ref:`set <set>`, :ref:`map <map>`, or document type is targeted,
    the shape value is serialized as a :ref:`protocol-specific <protocolDefinition-trait>`
    document that is sent as the body of the message.
+#. When any other type of member is referenced, the raw value is serialized as
+   the body of the message.
 
 
 .. smithy-trait:: smithy.api#httpPrefixHeaders

docs/source-2.0/spec/http-bindings.rst

@@ -709,14 +709,9 @@ the body of the response.
 Summary
     Binds a single structure member to the body of an HTTP message.
 Trait selector
-    .. code-block:: none
-
-        structure > :test(member > :test(string, blob, structure, union, document, list, map))
-
-    The ``httpPayload`` trait can be applied to ``structure`` members that
-    target a ``string``, ``blob``, ``structure``, ``union``, ``document``,
-    ``map``, or ``list``.
+    ``structure > member``
 
+    *Any structure member*
 Value type
     Annotation trait.
 Conflicts with
@@ -779,12 +774,12 @@ or :ref:`httpPrefixHeaders-trait`.
 
 .. rubric:: Serialization rules
 
-#. When a string or blob member is referenced, the raw value is serialized
-   as the body of the message.
 #. When a :ref:`structure <structure>`, :ref:`union <union>`, :ref:`list <list>`,
    :ref:`map <map>`, or document type is targeted, the shape value is serialized
    as a :ref:`protocol-specific <protocolDefinition-trait>` document that is sent
    as the body of the message.
+#. When any other type of member is referenced, the raw value is serialized as
+   the body of the message.
 
 
 .. smithy-trait:: smithy.api#httpPrefixHeaders

smithy-aws-traits/src/test/resources/software/amazon/smithy/aws/traits/errorfiles/protocols/aws-protocols-do-not-support-list-set-map-payloads.errors

@@ -1,3 +1,6 @@
 [ERROR] smithy.example#InvalidBindingOperationInput$listBinding: AWS Protocols only support binding the following shape types to the payload: string, blob, structure, union, and document | ProtocolHttpPayload
 [ERROR] smithy.example#InvalidBindingOperationOutput$mapBinding: AWS Protocols only support binding the following shape types to the payload: string, blob, structure, union, and document | ProtocolHttpPayload
 [ERROR] smithy.example#InvalidBindingError$setBinding: AWS Protocols only support binding the following shape types to the payload: string, blob, structure, union, and document | ProtocolHttpPayload
+[ERROR] smithy.example#InvalidSimpleBindingOperationInput$booleanBinding: AWS Protocols only support binding the following shape types to the payload: string, blob, structure, union, and document | ProtocolHttpPayload
+[ERROR] smithy.example#InvalidSimpleBindingOperationOutput$integerBinding: AWS Protocols only support binding the following shape types to the payload: string, blob, structure, union, and document | ProtocolHttpPayload
+[ERROR] smithy.example#InvalidSimpleBindingError$doubleBinding: AWS Protocols only support binding the following shape types to the payload: string, blob, structure, union, and document | ProtocolHttpPayload

smithy-aws-traits/src/test/resources/software/amazon/smithy/aws/traits/errorfiles/protocols/aws-protocols-do-not-support-list-set-map-payloads.smithy

@@ -13,7 +13,10 @@ use smithy.api#httpPayload
 @restJson1
 service InvalidExample {
     version: "2020-12-29",
-    operations: [InvalidBindingOperation],
+    operations: [
+        InvalidBindingOperation,
+        InvalidSimpleBindingOperation
+    ],
 }
 
 @http(method: "POST", uri: "/invalid-payload")
@@ -41,6 +44,31 @@ structure InvalidBindingError {
     setBinding: StringSet
 }
 
+@http(method: "POST", uri: "/invalid-simple-payload")
+operation InvalidSimpleBindingOperation {
+    input: InvalidSimpleBindingOperationInput,
+    output: InvalidSimpleBindingOperationOutput,
+    errors: [InvalidSimpleBindingError],
+}
+
+@input
+structure InvalidSimpleBindingOperationInput {
+    @httpPayload
+    booleanBinding: Boolean,
+}
+
+@output
+structure InvalidSimpleBindingOperationOutput {
+    @httpPayload
+    integerBinding: Integer,
+}
+
+@error("client")
+structure InvalidSimpleBindingError {
+    @httpPayload
+    doubleBinding: Double
+}
+
 list StringList {
     member: String
 }

smithy-model/src/main/resources/software/amazon/smithy/model/loader/prelude.smithy

@@ -832,7 +832,7 @@ string httpPrefixHeaders
 
 /// Binds a single structure member to the body of an HTTP request.
 @trait(
-    selector: "structure > :test(member > :test(string, blob, structure, union, document, list, map))",
+    selector: "structure > member",
     conflicts: [httpLabel, httpQuery, httpHeader, httpPrefixHeaders, httpResponseCode, httpQueryParams],
     structurallyExclusive: "member",
     breakingChanges: [{change: "presence"}]