fix: Request Parameters not picked up for v1 payload format with multivalue headers enabled (#1256)

Author: deki

aws-serverless-java-container-springboot3/src/main/java/com/amazonaws/serverless/proxy/spring/AwsSpringHttpProcessingUtils.java

@@ -119,7 +119,9 @@ private static HttpServletRequest generateRequest1(String request, Context lambd
 		populateQueryStringParameters(v1Request.getQueryStringParameters(), httpRequest);
 		if (v1Request.getMultiValueQueryStringParameters() != null) {
 			MultiValueMapAdapter<String, String> queryStringParameters = new MultiValueMapAdapter(v1Request.getMultiValueQueryStringParameters());
-			queryStringParameters.forEach((k, v) -> httpRequest.setParameter(k, StringUtils.collectionToCommaDelimitedString(v)));
+			queryStringParameters.forEach((k, v) -> {
+                httpRequest.setParameter(k, v.toArray(new String[2]));
+            });
 		}
 
 		if (v1Request.getMultiValueHeaders() != null) {
@@ -155,7 +157,7 @@ private static HttpServletRequest generateRequest2(String request, Context lambd
 		ServerlessHttpServletRequest httpRequest = new ServerlessHttpServletRequest(servletContext,
 				v2Request.getRequestContext().getHttp().getMethod(), v2Request.getRequestContext().getHttp().getPath());
 		populateQueryStringParameters(v2Request.getQueryStringParameters(), httpRequest);
-		
+
 		v2Request.getHeaders().forEach(httpRequest::setHeader);
 
         populateContentAndContentType(
@@ -177,6 +179,7 @@ private static HttpServletRequest generateRequest2(String request, Context lambd
 	private static void populateQueryStringParameters(Map<String, String> requestParameters, ServerlessHttpServletRequest httpRequest) {
 		if (!CollectionUtils.isEmpty(requestParameters)) {
 			for (Entry<String, String> entry : requestParameters.entrySet()) {
+				// fix according to parseRawQueryString
 				httpRequest.setParameter(entry.getKey(), entry.getValue());
 			}
 		}

aws-serverless-java-container-springboot3/src/test/java/com/amazonaws/serverless/proxy/spring/AwsSpringHttpProcessingUtilsTests.java

@@ -1,12 +1,12 @@
 package com.amazonaws.serverless.proxy.spring;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
 import java.io.ByteArrayInputStream;
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.Collection;
 
+import com.amazonaws.serverless.proxy.RequestReader;
+import com.amazonaws.serverless.proxy.model.HttpApiV2ProxyRequest;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.springframework.boot.SpringApplication;
@@ -30,6 +30,8 @@
 
 import jakarta.servlet.http.HttpServletRequest;
 
+import static org.junit.jupiter.api.Assertions.*;
+
 public class AwsSpringHttpProcessingUtilsTests {
 
 	private static String API_GATEWAY_EVENT = "{\n"
@@ -221,7 +223,6 @@ public void validateHttpServletRequestGenerationWithInputStream(String jsonEvent
 		ByteArrayInputStream inputStream = new ByteArrayInputStream(jsonEvent.getBytes(StandardCharsets.UTF_8));
 		ServerlessServletContext servletContext = new ServerlessServletContext();
 		HttpServletRequest request = AwsSpringHttpProcessingUtils.generateHttpServletRequest(inputStream, null, servletContext, mapper);
-		// spot check some headers
 		assertRequest(request);
 	}
 
@@ -230,9 +231,13 @@ private static void assertRequest(HttpServletRequest request) {
 		assertEquals("443", request.getHeader("X-Forwarded-Port"));
 		assertEquals("POST", request.getMethod());
 		assertEquals("/async", request.getRequestURI());
-		assertEquals("value1,value2", request.getParameter("parameter1"));
-		// to be fixed: assertArrayEquals(new String[]{"value1","value2"}, request.getParameterValues("parameter1"));
-
+		assertNotNull(request.getServletContext());
+		// parameter handling for 2.0 requests is currently not spec compliant and to be fixed in future version
+		// see also GitHub issue
+		if (!(request.getAttribute(RequestReader.HTTP_API_EVENT_PROPERTY) instanceof HttpApiV2ProxyRequest)) {
+			assertEquals("value1", request.getParameter("parameter1"));
+			assertArrayEquals(new String[]{"value1", "value2"}, request.getParameterValues("parameter1"));
+		}
 	}
 
     @MethodSource("data")