fix when response payload is not structured string

Author: AllanZhengYP

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpBindingProtocolGenerator.java

@@ -116,6 +116,8 @@ public void generateSharedComponents(GenerationContext context) {
         generateDocumentBodyShapeSerializers(context, serializingDocumentShapes);
         generateDocumentBodyShapeDeserializers(context, deserializingDocumentShapes);
         HttpProtocolGeneratorUtils.generateMetadataDeserializer(context, getApplicationProtocol().getResponseType());
+        HttpProtocolGeneratorUtils.generateCollectBody(context);
+        HttpProtocolGeneratorUtils.generateCollectBodyString(context);
     }
 
     /**
@@ -675,43 +677,44 @@ private List<HttpBinding> readResponseBody(
         List<HttpBinding> documentBindings = bindingIndex.getResponseBindings(operationOrError, Location.DOCUMENT);
         documentBindings.sort(Comparator.comparing(HttpBinding::getMemberName));
         List<HttpBinding> payloadBindings = bindingIndex.getResponseBindings(operationOrError, Location.PAYLOAD);
+        OperationIndex operationIndex = context.getModel().getKnowledge(OperationIndex.class);
+        StructureShape operationOutputOrError = operationOrError.asStructureShape()
+                .orElseGet(() -> operationIndex.getOutput(operationOrError).orElse(null));
+        boolean hasStreamingComponent = Optional.ofNullable(operationOutputOrError)
+                .map(structure -> structure.getAllMembers().values().stream()
+                        .anyMatch(memberShape -> memberShape.hasTrait(StreamingTrait.class)))
+                .orElse(false);
 
         if (!documentBindings.isEmpty()) {
-            readReponseBodyData(context, operationOrError);
+            writer.write("const data: any = await parseBody(output.body, context);");
             deserializeOutputDocument(context, operationOrError, documentBindings);
             return documentBindings;
         }
         if (!payloadBindings.isEmpty()) {
-            readReponseBodyData(context, operationOrError);
             // There can only be one payload binding.
             HttpBinding binding = payloadBindings.get(0);
             Shape target = context.getModel().expectShape(binding.getMember().getTarget());
+            if (hasStreamingComponent) {
+                // If payload is streaming, return raw low-level stream directly.
+                writer.write("const data: any = output.body;");
+            } else if (target instanceof BlobShape) {
+                // If payload is blob, only need to collect stream to binary data(Uint8Array).
+                writer.write("const data: any = await collectBody(output.body, context);");
+            } else if (target instanceof CollectionShape || target instanceof StructureShape) {
+                // If body is Collection or Structure, they we need to parse the string into JavaScript object.
+                writer.write("const data: any = await parseBody(output.body, context);");
+            } else {
+                // If payload is other scalar types(not Collection or Structure), because payload will be values in
+                // string instead of valid JSON or XML. So we need to collect body and encode binary to string.
+                writer.write("const data: any = await collectBodyString(output.body, context);");
+            }
             writer.write("contents.$L = $L;", binding.getMemberName(), getOutputValue(context,
                     Location.PAYLOAD, "data", binding.getMember(), target));
             return payloadBindings;
         }
         return ListUtils.of();
     }
 
-    private void readReponseBodyData(GenerationContext context, Shape operationOrError) {
-        TypeScriptWriter writer = context.getWriter();
-        // Prepare response body for deserializing.
-        OperationIndex operationIndex = context.getModel().getKnowledge(OperationIndex.class);
-        StructureShape operationOutputOrError = operationOrError.asStructureShape()
-                .orElseGet(() -> operationIndex.getOutput(operationOrError).orElse(null));
-        boolean hasStreamingComponent = Optional.ofNullable(operationOutputOrError)
-                .map(structure -> structure.getAllMembers().values().stream()
-                        .anyMatch(memberShape -> memberShape.hasTrait(StreamingTrait.class)))
-                .orElse(false);
-        if (hasStreamingComponent) {
-            // For operations with streaming output or errors with streaming body we keep the body intact.
-            writer.write("const data: any = output.body;");
-        } else {
-            // Otherwise, we collect the response body to structured object with parseBody().
-            writer.write("const data: any = await parseBody(output.body, context);");
-        }
-    }
-
     /**
      * Given context and a source of data, generate an output value provider for the
      * shape. This may use native types (like generating a Date for timestamps,)

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpProtocolGeneratorUtils.java

@@ -108,6 +108,30 @@ static void generateMetadataDeserializer(GenerationContext context, SymbolRefere
         writer.write("");
     }
 
+    static void generateCollectBody(GenerationContext context) {
+        TypeScriptWriter writer = context.getWriter();
+
+        writer.addImport("SerdeContext", "__SerdeContext", "@aws-sdk/types");
+        writer.openBlock("const collectBody = (streamBody: any, context: __SerdeContext): Promise<Uint8Array> => {",
+                "};", () -> {
+            writer.write("return context.streamCollector(streamBody) || new Uint8Array();");
+        });
+
+        writer.write("");
+    }
+
+    static void generateCollectBodyString(GenerationContext context) {
+        TypeScriptWriter writer = context.getWriter();
+
+        writer.addImport("SerdeContext", "__SerdeContext", "@aws-sdk/types");
+        writer.openBlock("const collectBodyString = (streamBody: any, context: __SerdeContext): Promise<string> => {",
+                "};", () -> {
+            writer.write("return collectBody(streamBody, context).then(body => context.utf8Encoder(body));");
+        });
+
+        writer.write("");
+    }
+
     /**
      * Writes a function used to dispatch to the proper error deserializer
      * for each error that the operation can return. The generated function