Wire up signers

Author: nateprewitt

codegen/core/src/main/java/software/amazon/smithy/python/codegen/integrations/RestJsonProtocolGenerator.java

@@ -397,12 +397,24 @@ public void wrapInputStream(GenerationContext context, PythonWriter writer) {
         writer.addImport("smithy_core.aio.types", "AsyncBytesReader");
         writer.addImport("smithy_core.types", "TimestampFormat");
         writer.addImport("aws_event_stream.aio", "AWSEventPublisher");
+        writer.addImport("aws_sdk_signers", "AsyncEventSigner");
         writer.write(
                 """
+                        # TODO - Move this out of the RestJSON generator
+                        ctx = request_context
+                        signer_properties = ctx.properties.get("signer_properties")  # type: ignore
+                        identity = ctx.properties.get("identity")  # type: ignore
+                        signature = ctx.properties.get("signature")  # type: ignore
+                        signer = AsyncEventSigner(
+                            signing_properties=signer_properties,  # type: ignore
+                            identity=identity,  # type: ignore
+                            initial_signature=signature,  # type: ignore
+                        )
                         codec = JSONCodec(default_timestamp_format=TimestampFormat.EPOCH_SECONDS)
                         publisher = AWSEventPublisher[Any](
                             payload_codec=codec,
                             async_writer=request_context.transport_request.body,  # type: ignore
+                            signer=signer,  # type: ignore
                         )
                         """);
     }
@@ -428,4 +440,3 @@ public void wrapOutputStream(GenerationContext context, PythonWriter writer) {
                         )
                         """);
     }
-}