[C++] SDKs to track 3 feature Ids for S3 functionality

src/aws-cpp-sdk-core/include/aws/core/client/UserAgent.h

@@ -17,6 +17,7 @@ enum class UserAgentFeature {
   S3_TRANSFER,
   S3_CRYPTO_V1N,
   S3_CRYPTO_V2,
+  S3_EXPRESS_BUCKET,
   FLEXIBLE_CHECKSUMS_REQ_CRC32,
   FLEXIBLE_CHECKSUMS_REQ_CRC32C,
   FLEXIBLE_CHECKSUMS_REQ_CRC64,

src/aws-cpp-sdk-core/source/client/AWSXmlClient.cpp

@@ -20,6 +20,7 @@
 #include <aws/core/utils/logging/LogMacros.h>
 #include <aws/core/utils/event/EventStream.h>
 #include <aws/core/utils/UUID.h>
+#include <aws/core/client/UserAgent.h>
 #include <smithy/tracing/TracingUtils.h>
 
 using namespace Aws;
@@ -53,6 +54,10 @@ XmlOutcome AWSXMLClient::MakeRequest(const Aws::AmazonWebServiceRequest& request
                                      const char* signerServiceNameOverride /* = nullptr */) const
 {
     const Aws::Http::URI& uri = endpoint.GetURI();
+    // Add S3Express user agent feature if backend is S3Express
+    if (endpoint.GetAttributes() && endpoint.GetAttributes()->backend == "S3Express") {
+      request.AddUserAgentFeature(Aws::Client::UserAgentFeature::S3_EXPRESS_BUCKET);
+    }
     if (endpoint.GetAttributes()) {
         signerName = endpoint.GetAttributes()->authScheme.GetName().c_str();
         if (endpoint.GetAttributes()->authScheme.GetSigningRegion()) {

src/aws-cpp-sdk-core/source/client/UserAgent.cpp

@@ -27,6 +27,7 @@ const std::pair<UserAgentFeature, const char*> BUSINESS_METRIC_MAPPING[] = {
     {UserAgentFeature::S3_TRANSFER, "G"},
     {UserAgentFeature::S3_CRYPTO_V1N, "H"},
     {UserAgentFeature::S3_CRYPTO_V2, "I"},
+    {UserAgentFeature::S3_EXPRESS_BUCKET, "J"},
     {UserAgentFeature::FLEXIBLE_CHECKSUMS_REQ_CRC32, "U"},
     {UserAgentFeature::FLEXIBLE_CHECKSUMS_REQ_CRC32C, "V"},
     {UserAgentFeature::FLEXIBLE_CHECKSUMS_REQ_CRC64, "W"},

tests/aws-cpp-sdk-s3-unit-tests/S3UnitTests.cpp

@@ -378,6 +378,37 @@ TEST_F(S3UnitTest, PutObjectShouldHaveCorrectUserAgent) {
   EXPECT_TRUE(archMetadata < businessMetrics);
 }
 
+TEST_F(S3UnitTest, PutObjectS3ExpressShouldHaveJMetric) {
+  auto request = PutObjectRequest()
+    .WithBucket("o-worthy-heart--usw2-az1--x-s3")  // S3Express bucket pattern
+    .WithKey("who-tempers-anxiety-into-strength");
+
+  std::shared_ptr<IOStream> body = Aws::MakeShared<StringStream>(ALLOCATION_TAG, "time marches on, and the age of a new king draws nearer");
+  request.SetBody(body);
+
+  auto mockRequest = Aws::MakeShared<Standard::StandardHttpRequest>(ALLOCATION_TAG, "alonzo.com/faker", HttpMethod::HTTP_PUT);
+  mockRequest->SetResponseStreamFactory([]() -> IOStream* {
+    return Aws::New<StringStream>(ALLOCATION_TAG, "", std::ios_base::in | std::ios_base::binary);
+  });
+  auto mockResponse = Aws::MakeShared<Standard::StandardHttpResponse>(ALLOCATION_TAG, mockRequest);
+  mockResponse->SetResponseCode(HttpResponseCode::OK);
+
+  _mockHttpClient->AddResponseToReturn(mockResponse);
+
+  const auto response = _s3Client->PutObject(request);
+
+  const auto requestSeen = _mockHttpClient->GetMostRecentHttpRequest();
+  EXPECT_TRUE(requestSeen.HasUserAgent());
+  const auto& userAgent = requestSeen.GetUserAgent();
+  EXPECT_TRUE(!userAgent.empty());
+  const auto userAgentParsed = Utils::StringUtils::Split(userAgent, ' ');
+
+  // Check for S3Express business metric (J) in user agent
+  auto businessMetrics = std::find_if(userAgentParsed.begin(), userAgentParsed.end(), 
+    [](const Aws::String & value) { return value.find("m/") != Aws::String::npos && value.find("J") != Aws::String::npos; });
+  EXPECT_TRUE(businessMetrics != userAgentParsed.end());
+}
+
 TEST_F(S3UnitTest, RequestShouldNotIncludeAChecksumIfNotRequired) {
   S3ClientConfiguration configuration{};
   configuration.checksumConfig.requestChecksumCalculation = RequestChecksumCalculation::WHEN_REQUIRED;