arpadboda commented on a change in pull request #915:
URL: https://github.com/apache/nifi-minifi-cpp/pull/915#discussion_r512621151



##########
File path: cmake/BundledAwsSdkCpp.cmake
##########
@@ -68,40 +77,40 @@ function(use_bundled_libaws SOURCE_DIR BINARY_DIR)
     ExternalProject_Add(
             aws-c-common-external
             GIT_REPOSITORY "https://github.com/awslabs/aws-c-common.git";
-            GIT_TAG "ac02e1728d740bb9106b6ea727cd3378f8ea438a"
+            GIT_TAG "d8f6f067975cd3670c62cca0455b9d381db19756"
             SOURCE_DIR "${BINARY_DIR}/thirdparty/aws-c-common-src"
             INSTALL_DIR "${BINARY_DIR}/thirdparty/libaws-install"
             LIST_SEPARATOR % # This is needed for passing semicolon-separated 
lists
             CMAKE_ARGS ${AWS_C_COMMON_CMAKE_ARGS}
-            BUILD_BYPRODUCTS 
"${BINARY_DIR}/thirdparty/libaws-install/lib/libaws-c-common.${SUFFIX}"
+            BUILD_BYPRODUCTS 
"${BINARY_DIR}/thirdparty/libaws-install/${CMAKE_INSTALL_LIBDIR}/${PREFIX}aws-c-common.${SUFFIX}"
             EXCLUDE_FROM_ALL TRUE
     )
     ExternalProject_Add(
             aws-checksum-external
             GIT_REPOSITORY "https://github.com/awslabs/aws-checksums.git";
-            GIT_TAG "41dc36d14b0898bd34e3f91c808fcb00f5e21875"
+            GIT_TAG "8e1a84c2924774db1b9d945c556343b217d71d05"
             SOURCE_DIR "${BINARY_DIR}/thirdparty/aws-checksums-src"
             INSTALL_DIR "${BINARY_DIR}/thirdparty/libaws-install"
             LIST_SEPARATOR % # This is needed for passing semicolon-separated 
lists
             CMAKE_ARGS ${AWS_CHECKSUM_CMAKE_ARGS}
-            BUILD_BYPRODUCTS 
"${BINARY_DIR}/thirdparty/libaws-install/lib/libaws-checksums.${SUFFIX}"
+            BUILD_BYPRODUCTS 
"${BINARY_DIR}/thirdparty/libaws-install/${CMAKE_INSTALL_LIBDIR}/${PREFIX}aws-checksums.${SUFFIX}"
             EXCLUDE_FROM_ALL TRUE
     )
     ExternalProject_Add(
             aws-c-event-stream-external
             GIT_REPOSITORY "https://github.com/awslabs/aws-c-event-stream.git";
-            GIT_TAG "97ab2e57e83ad114679dbee0dcfb5048640debe7"
+            GIT_TAG "3462b68d563d8f9b3a26517b833671a24ab81cc5"
             SOURCE_DIR "${BINARY_DIR}/thirdparty/aws-c-event-stream-src"
             INSTALL_DIR "${BINARY_DIR}/thirdparty/libaws-install"
             LIST_SEPARATOR % # This is needed for passing semicolon-separated 
lists
             CMAKE_ARGS ${AWS_C_EVENT_STREAM_CMAKE_ARGS}
-            BUILD_BYPRODUCTS 
"${BINARY_DIR}/thirdparty/libaws-install/lib/libaws-c-event-stream.${SUFFIX}"
+            BUILD_BYPRODUCTS 
"${BINARY_DIR}/thirdparty/libaws-install/${CMAKE_INSTALL_LIBDIR}/${PREFIX}aws-c-event-stream.${SUFFIX}"
             EXCLUDE_FROM_ALL TRUE
     )
     ExternalProject_Add(
             aws-sdk-cpp-external
             GIT_REPOSITORY "https://github.com/aws/aws-sdk-cpp.git";
-            GIT_TAG "1.7.109"
+            GIT_TAG "1.8.52"

Review comment:
       👍 

##########
File path: extensions/aws/processors/PutS3Object.h
##########
@@ -0,0 +1,197 @@
+/**
+ * @file PutS3Object.h
+ * PutS3Object class declaration
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <sstream>
+#include <utility>
+#include <vector>
+#include <memory>
+#include <string>
+#include <set>
+
+#include "aws/core/auth/AWSCredentialsProvider.h"
+
+#include "S3Wrapper.h"
+#include "core/Property.h"
+#include "core/Processor.h"
+#include "core/logging/Logger.h"
+#include "core/logging/LoggerConfiguration.h"
+#include "utils/OptionalUtils.h"
+
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace aws {
+namespace processors {
+
+namespace region {
+
+constexpr const char *AF_SOUTH_1 = "af-south-1";
+constexpr const char *AP_EAST_1 = "ap-east-1";
+constexpr const char *AP_NORTHEAST_1 = "ap-northeast-1";
+constexpr const char *AP_NORTHEAST_2 = "ap-northeast-2";
+constexpr const char *AP_NORTHEAST_3 = "ap-northeast-3";
+constexpr const char *AP_SOUTH_1 = "ap-south-1";
+constexpr const char *AP_SOUTHEAST_1 = "ap-southeast-1";
+constexpr const char *AP_SOUTHEAST_2 = "ap-southeast-2";
+constexpr const char *CA_CENTRAL_1 = "ca-central-1";
+constexpr const char *CN_NORTH_1 = "cn-north-1";
+constexpr const char *CN_NORTHWEST_1 = "cn-northwest-1";
+constexpr const char *EU_CENTRAL_1 = "eu-central-1";
+constexpr const char *EU_NORTH_1 = "eu-north-1";
+constexpr const char *EU_SOUTH_1 = "eu-south-1";
+constexpr const char *EU_WEST_1 = "eu-west-1";
+constexpr const char *EU_WEST_2 = "eu-west-2";
+constexpr const char *EU_WEST_3 = "eu-west-3";
+constexpr const char *ME_SOUTH_1 = "me-south-1";
+constexpr const char *SA_EAST_1 = "sa-east-1";
+constexpr const char *US_EAST_1 = "us-east-1";
+constexpr const char *US_EAST_2 = "us-east-2";
+constexpr const char *US_GOV_EAST_1 = "us-gov-east-1";
+constexpr const char *US_GOV_WEST_1 = "us-gov-west-1";
+constexpr const char *US_WEST_1 = "us-west-1";
+constexpr const char *US_WEST_2 = "us-west-2";
+
+}  // namespace region
+
+class PutS3Object : public core::Processor {
+ public:
+  static constexpr char const* ProcessorName = "PutS3Object";
+
+  static const std::set<std::string> CANNED_ACLS;
+  static const std::set<std::string> REGIONS;
+  static const std::set<std::string> STORAGE_CLASSES;
+  static const std::set<std::string> SERVER_SIDE_ENCRYPTIONS;
+
+  // Supported Properties
+  static const core::Property ObjectKey;
+  static const core::Property Bucket;
+  static const core::Property ContentType;
+  static const core::Property AccessKey;
+  static const core::Property SecretKey;
+  static const core::Property CredentialsFile;
+  static const core::Property AWSCredentialsProviderService;
+  static const core::Property StorageClass;
+  static const core::Property ServerSideEncryption;
+  static const core::Property Region;
+  static const core::Property CommunicationsTimeout;
+  static const core::Property FullControlUserList;
+  static const core::Property ReadPermissionUserList;
+  static const core::Property ReadACLUserList;
+  static const core::Property WriteACLUserList;
+  static const core::Property CannedACL;
+  static const core::Property EndpointOverrideURL;
+  static const core::Property ProxyHost;
+  static const core::Property ProxyPort;
+  static const core::Property ProxyUsername;
+  static const core::Property ProxyPassword;
+
+  // Supported Relationships
+  static const core::Relationship Failure;
+  static const core::Relationship Success;
+
+  explicit PutS3Object(std::string name, minifi::utils::Identifier uuid = 
minifi::utils::Identifier())
+      : PutS3Object(name, uuid, 
minifi::utils::make_unique<aws::s3::S3Wrapper>()) {
+  }
+
+  explicit PutS3Object(std::string name, minifi::utils::Identifier uuid, 
std::unique_ptr<aws::s3::S3WrapperBase> s3_wrapper)
+      : core::Processor(std::move(name), uuid)
+      , s3_wrapper_(std::move(s3_wrapper)) {
+  }
+
+  ~PutS3Object() override = default;
+
+  bool supportsDynamicProperties() override { return true; }
+  void initialize() override;
+  void onSchedule(const std::shared_ptr<core::ProcessContext> &context, const 
std::shared_ptr<core::ProcessSessionFactory> &sessionFactory) override;
+  void onTrigger(const std::shared_ptr<core::ProcessContext> &context, const 
std::shared_ptr<core::ProcessSession> &session) override;
+
+  class ReadCallback : public InputStreamCallback {
+   public:
+    static const uint64_t MAX_SIZE = 5UL * 1024UL * 1024UL * 1024UL;  // 5GB 
limit on AWS
+    static const uint64_t BUFFER_SIZE = 4096;
+
+    ReadCallback(uint64_t flow_size, const 
minifi::aws::s3::PutObjectRequestParameters& options, aws::s3::S3WrapperBase* 
s3_wrapper)
+      : flow_size_(flow_size)
+      , options_(options)
+      , s3_wrapper_(s3_wrapper) {
+    }
+
+    int64_t process(std::shared_ptr<io::BaseStream> stream) override {
+      if (flow_size_ > MAX_SIZE) {
+        return -1;
+      }
+      std::vector<uint8_t> buffer;
+      auto data_stream = std::make_shared<std::stringstream>();
+      buffer.reserve(BUFFER_SIZE);
+      read_size_ = 0;
+      while (read_size_ < flow_size_) {
+        auto next_read_size = flow_size_ - read_size_ < BUFFER_SIZE ? 
flow_size_ - read_size_ : BUFFER_SIZE;

Review comment:
       The right side looks like an std::min to me :) 

##########
File path: extensions/aws/processors/PutS3Object.cpp
##########
@@ -0,0 +1,495 @@
+/**
+ * @file PutS3Object.cpp
+ * PutS3Object class implementation
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "PutS3Object.h"
+
+#include <string>
+#include <set>
+#include <memory>
+#include <map>
+
+#include "AWSCredentialsService.h"
+#include "properties/Properties.h"
+#include "utils/StringUtils.h"
+#include "utils/MapUtils.h"
+
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace aws {
+namespace processors {
+
+const std::set<std::string> 
PutS3Object::CANNED_ACLS(minifi::utils::MapUtils::getKeys(minifi::aws::s3::CANNED_ACL_MAP));
+const std::set<std::string> PutS3Object::REGIONS({region::AF_SOUTH_1, 
region::AP_EAST_1, region::AP_NORTHEAST_1,
+  region::AP_NORTHEAST_2, region::AP_NORTHEAST_3, region::AP_SOUTH_1, 
region::AP_SOUTHEAST_1, region::AP_SOUTHEAST_2,
+  region::CA_CENTRAL_1, region::CN_NORTH_1, region::CN_NORTHWEST_1, 
region::EU_CENTRAL_1, region::EU_NORTH_1,
+  region::EU_SOUTH_1, region::EU_WEST_1, region::EU_WEST_2, region::EU_WEST_3, 
region::ME_SOUTH_1, region::SA_EAST_1,
+  region::US_EAST_1, region::US_EAST_2, region::US_GOV_EAST_1, 
region::US_GOV_WEST_1, region::US_WEST_1, region::US_WEST_2});
+const std::set<std::string> 
PutS3Object::STORAGE_CLASSES(minifi::utils::MapUtils::getKeys(minifi::aws::s3::STORAGE_CLASS_MAP));
+const std::set<std::string> 
PutS3Object::SERVER_SIDE_ENCRYPTIONS(minifi::utils::MapUtils::getKeys(minifi::aws::s3::SERVER_SIDE_ENCRYPTION_MAP));
+
+const core::Property PutS3Object::ObjectKey(
+  core::PropertyBuilder::createProperty("Object Key")
+    ->withDescription("The key of the S3 object. If none is given the filename 
attribute will be used by default.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::Bucket(
+  core::PropertyBuilder::createProperty("Bucket")
+    ->withDescription("The S3 bucket")
+    ->isRequired(true)
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ContentType(
+  core::PropertyBuilder::createProperty("Content Type")
+    ->withDescription("Sets the Content-Type HTTP header indicating the type 
of content stored in "
+                      "the associated object. The value of this header is a 
standard MIME type. "
+                      "If no content type is provided the default content type 
"
+                      "\"application/octet-stream\" will be used.")
+    ->supportsExpressionLanguage(true)
+    ->withDefaultValue<std::string>("application/octet-stream")
+    ->build());
+const core::Property PutS3Object::AccessKey(
+  core::PropertyBuilder::createProperty("Access Key")
+    ->withDescription("AWS account access key")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::SecretKey(
+  core::PropertyBuilder::createProperty("Secret Key")
+    ->withDescription("AWS account secret key")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::CredentialsFile(
+  core::PropertyBuilder::createProperty("Credentials File")
+    ->withDescription("Path to a file containing AWS access key and secret key 
in properties file format. Properties used: accessKey and secretKey")
+    ->build());
+const core::Property PutS3Object::AWSCredentialsProviderService(
+  core::PropertyBuilder::createProperty("AWS Credentials Provider service")
+    ->withDescription("The name of the AWS Credentials Provider controller 
service that is used to obtain AWS credentials.")
+    ->build());
+const core::Property PutS3Object::StorageClass(
+  core::PropertyBuilder::createProperty("Storage Class")
+    ->isRequired(true)
+    ->withDefaultValue<std::string>("Standard")
+    ->withAllowableValues<std::string>(PutS3Object::STORAGE_CLASSES)
+    ->withDescription("AWS S3 Storage Class")
+    ->build());
+const core::Property PutS3Object::Region(
+  core::PropertyBuilder::createProperty("Region")
+    ->isRequired(true)
+    ->withDefaultValue<std::string>(region::US_WEST_2)
+    ->withAllowableValues<std::string>(PutS3Object::REGIONS)
+    ->withDescription("AWS Region")
+    ->build());
+const core::Property PutS3Object::CommunicationsTimeout(
+  core::PropertyBuilder::createProperty("Communications Timeout")
+    ->isRequired(true)
+    ->withDefaultValue<core::TimePeriodValue>("30 sec")
+    ->withDescription("")
+    ->build());
+const core::Property PutS3Object::FullControlUserList(
+  core::PropertyBuilder::createProperty("FullControl User List")
+    ->withDescription("A comma-separated list of Amazon User ID's or E-mail 
addresses that specifies who should have Full Control for an object.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ReadPermissionUserList(
+  core::PropertyBuilder::createProperty("Read Permission User List")
+    ->withDescription("A comma-separated list of Amazon User ID's or E-mail 
addresses that specifies who should have Read Access for an object.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ReadACLUserList(
+  core::PropertyBuilder::createProperty("Read ACL User List")
+    ->withDescription("A comma-separated list of Amazon User ID's or E-mail 
addresses that specifies who should have permissions to read "
+                      "the Access Control List for an object.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::WriteACLUserList(
+  core::PropertyBuilder::createProperty("Write ACL User List")
+    ->withDescription("A comma-separated list of Amazon User ID's or E-mail 
addresses that specifies who should have permissions to change "
+                      "the Access Control List for an object.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::CannedACL(
+  core::PropertyBuilder::createProperty("Canned ACL")
+    ->withDescription("Amazon Canned ACL for an object. Allowed values: 
BucketOwnerFullControl, BucketOwnerRead, AuthenticatedRead, "
+                      "PublicReadWrite, PublicRead, Private, AwsExecRead; will 
be ignored if any other ACL/permission property is specified.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::EndpointOverrideURL(
+  core::PropertyBuilder::createProperty("Endpoint Override URL")
+    ->withDescription("Endpoint URL to use instead of the AWS default 
including scheme, host, "
+                      "port, and path. The AWS libraries select an endpoint 
URL based on the AWS "
+                      "region, but this property overrides the selected 
endpoint URL, allowing use "
+                      "with other S3-compatible endpoints.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ServerSideEncryption(
+  core::PropertyBuilder::createProperty("Server Side Encryption")
+    ->isRequired(true)
+    ->withDefaultValue<std::string>("None")
+    ->withAllowableValues<std::string>(PutS3Object::SERVER_SIDE_ENCRYPTIONS)
+    ->withDescription("Specifies the algorithm used for server side 
encryption.")
+    ->build());
+const core::Property PutS3Object::ProxyHost(
+  core::PropertyBuilder::createProperty("Proxy Host")
+    ->withDescription("Proxy host name or IP")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ProxyPort(
+  core::PropertyBuilder::createProperty("Proxy Port")
+    ->withDescription("The port number of the proxy host")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ProxyUsername(
+    core::PropertyBuilder::createProperty("Proxy Username")
+    ->withDescription("Username to set when authenticating against proxy")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ProxyPassword(
+  core::PropertyBuilder::createProperty("Proxy Password")
+    ->withDescription("Password to set when authenticating against proxy")
+    ->supportsExpressionLanguage(true)
+    ->build());
+
+const core::Relationship PutS3Object::Success("success", "FlowFiles are routed 
to success relationship");
+const core::Relationship PutS3Object::Failure("failure", "FlowFiles are routed 
to failure relationship");
+
+void PutS3Object::initialize() {
+  // Set the supported properties
+  std::set<core::Property> properties;
+  properties.insert(ObjectKey);
+  properties.insert(Bucket);
+  properties.insert(ContentType);
+  properties.insert(AccessKey);
+  properties.insert(SecretKey);
+  properties.insert(CredentialsFile);
+  properties.insert(AWSCredentialsProviderService);
+  properties.insert(StorageClass);
+  properties.insert(Region);
+  properties.insert(CommunicationsTimeout);
+  properties.insert(FullControlUserList);
+  properties.insert(ReadPermissionUserList);
+  properties.insert(ReadACLUserList);
+  properties.insert(WriteACLUserList);
+  properties.insert(CannedACL);
+  properties.insert(EndpointOverrideURL);
+  properties.insert(ServerSideEncryption);
+  properties.insert(ProxyHost);
+  properties.insert(ProxyPort);
+  properties.insert(ProxyUsername);
+  properties.insert(ProxyPassword);
+  setSupportedProperties(properties);
+  // Set the supported relationships
+  std::set<core::Relationship> relationships;
+  relationships.insert(Failure);
+  relationships.insert(Success);
+  setSupportedRelationships(relationships);
+}
+
+minifi::utils::optional<Aws::Auth::AWSCredentials> 
PutS3Object::getAWSCredentialsFromControllerService(const 
std::shared_ptr<core::ProcessContext> &context) const {
+  std::string service_name;
+  if (context->getProperty(AWSCredentialsProviderService.getName(), 
service_name) && !service_name.empty()) {
+    std::shared_ptr<core::controller::ControllerService> service = 
context->getControllerService(service_name);
+    if (nullptr != service) {
+      auto aws_credentials_service = 
std::dynamic_pointer_cast<minifi::aws::controllers::AWSCredentialsService>(service);
+      if (aws_credentials_service) {
+        return 
minifi::utils::make_optional<Aws::Auth::AWSCredentials>(aws_credentials_service->getAWSCredentials());
+      }
+    }
+  }
+  return minifi::utils::nullopt;
+}
+
+minifi::utils::optional<Aws::Auth::AWSCredentials> 
PutS3Object::getAWSCredentialsFromProperties(
+    const std::shared_ptr<core::ProcessContext> &context,
+    const std::shared_ptr<core::FlowFile> &flow_file) const {
+  std::string access_key;
+  context->getProperty(AccessKey, access_key, flow_file);
+  std::string secret_key;
+  context->getProperty(SecretKey, secret_key, flow_file);
+  if (!access_key.empty() && !secret_key.empty()) {
+    Aws::Auth::AWSCredentials creds(access_key, secret_key);
+    return minifi::utils::make_optional<Aws::Auth::AWSCredentials>(creds);
+  }
+  return minifi::utils::nullopt;
+}
+
+minifi::utils::optional<Aws::Auth::AWSCredentials> 
PutS3Object::getAWSCredentialsFromFile(const 
std::shared_ptr<core::ProcessContext> &context) const {
+  std::string credential_file;
+  if (context->getProperty(CredentialsFile.getName(), credential_file) && 
!credential_file.empty()) {
+    auto properties = std::make_shared<minifi::Properties>();
+    properties->loadConfigureFile(credential_file.c_str());
+    std::string access_key;
+    std::string secret_key;
+    if (properties->getString("accessKey", access_key) && !access_key.empty() 
&& properties->getString("secretKey", secret_key) && !secret_key.empty()) {
+      Aws::Auth::AWSCredentials creds(access_key, secret_key);
+      return minifi::utils::make_optional<Aws::Auth::AWSCredentials>(creds);
+    }
+  }
+  return minifi::utils::nullopt;
+}
+
+minifi::utils::optional<Aws::Auth::AWSCredentials> 
PutS3Object::getAWSCredentials(
+    const std::shared_ptr<core::ProcessContext> &context,
+    const std::shared_ptr<core::FlowFile> &flow_file) const {
+  auto prop_cred = getAWSCredentialsFromProperties(context, flow_file);
+  if (prop_cred) {
+    logger_->log_info("AWS Credentials successfully set from properties");
+    return prop_cred.value();
+  }
+
+  auto file_cred = getAWSCredentialsFromFile(context);
+  if (file_cred) {
+    logger_->log_info("AWS Credentials successfully set from file");
+    return file_cred.value();
+  }
+
+  auto service_cred = getAWSCredentialsFromControllerService(context);
+  if (service_cred) {
+    logger_->log_info("AWS Credentials successfully set from controller 
service");
+    return service_cred.value();
+  }
+
+  return minifi::utils::nullopt;
+}
+
+void PutS3Object::fillUserMetadata(const std::shared_ptr<core::ProcessContext> 
&context) {
+  const auto &dynamic_prop_keys = context->getDynamicPropertyKeys();
+  bool first_property = true;
+  for (const auto &prop_key : dynamic_prop_keys) {
+    std::string prop_value = "";
+    if (context->getDynamicProperty(prop_key, prop_value) && 
!prop_value.empty()) {
+      logger_->log_debug("PutS3Object: DynamicProperty: [%s] -> [%s]", 
prop_key, prop_value);
+      put_s3_request_params_.user_metadata_map.emplace(prop_key, prop_value);
+      if (first_property) {
+        user_metadata_ = prop_key + "=" + prop_value;
+        first_property = false;
+      } else {
+        user_metadata_ += "," + prop_key + "=" + prop_value;
+      }
+    }
+  }
+  logger_->log_debug("PutS3Object: User metadata [%s]", user_metadata_);
+}
+
+bool PutS3Object::setProxy(const std::shared_ptr<core::ProcessContext> 
&context, const std::shared_ptr<core::FlowFile> &flow_file) {
+  aws::s3::ProxyOptions proxy;
+  context->getProperty(ProxyHost, proxy.host, flow_file);
+  std::string port_str;
+  if (context->getProperty(ProxyPort, port_str, flow_file) && 
!port_str.empty() && !core::Property::StringToInt(port_str, proxy.port)) {
+    logger_->log_error("Proxy port invalid");
+    return false;
+  }
+  context->getProperty(ProxyUsername, proxy.username, flow_file);
+  context->getProperty(ProxyPassword, proxy.password, flow_file);
+  if (!proxy.host.empty()) {
+    s3_wrapper_->setProxy(proxy);
+    logger_->log_info("Proxy for PutS3Object was set.");
+  }
+  return true;
+}
+
+void PutS3Object::onSchedule(const std::shared_ptr<core::ProcessContext> 
&context, const std::shared_ptr<core::ProcessSessionFactory> &sessionFactory) {
+  if (!context->getProperty(Bucket.getName(), put_s3_request_params_.bucket) 
|| put_s3_request_params_.bucket.empty()) {
+    throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Bucket property missing or 
invalid");
+  }
+  logger_->log_debug("PutS3Object: Bucket [%s]", 
put_s3_request_params_.bucket);
+
+  if (!context->getProperty(StorageClass.getName(), 
put_s3_request_params_.storage_class)
+      || put_s3_request_params_.storage_class.empty()
+      || STORAGE_CLASSES.find(put_s3_request_params_.storage_class) == 
STORAGE_CLASSES.end()) {
+    throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Storage Class property 
missing or invalid");
+  }
+  logger_->log_debug("PutS3Object: Storage Class [%s]", 
put_s3_request_params_.storage_class);
+
+  std::string value;
+  if (!context->getProperty(Region.getName(), value) || value.empty() || 
REGIONS.find(value) == REGIONS.end()) {

Review comment:
       Just fancy: in case you use set, you can rely on count instead of 
comparing the result of find to end.

##########
File path: extensions/aws/processors/PutS3Object.cpp
##########
@@ -0,0 +1,495 @@
+/**
+ * @file PutS3Object.cpp
+ * PutS3Object class implementation
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "PutS3Object.h"
+
+#include <string>
+#include <set>
+#include <memory>
+#include <map>
+
+#include "AWSCredentialsService.h"
+#include "properties/Properties.h"
+#include "utils/StringUtils.h"
+#include "utils/MapUtils.h"
+
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace aws {
+namespace processors {
+
+const std::set<std::string> 
PutS3Object::CANNED_ACLS(minifi::utils::MapUtils::getKeys(minifi::aws::s3::CANNED_ACL_MAP));
+const std::set<std::string> PutS3Object::REGIONS({region::AF_SOUTH_1, 
region::AP_EAST_1, region::AP_NORTHEAST_1,
+  region::AP_NORTHEAST_2, region::AP_NORTHEAST_3, region::AP_SOUTH_1, 
region::AP_SOUTHEAST_1, region::AP_SOUTHEAST_2,
+  region::CA_CENTRAL_1, region::CN_NORTH_1, region::CN_NORTHWEST_1, 
region::EU_CENTRAL_1, region::EU_NORTH_1,
+  region::EU_SOUTH_1, region::EU_WEST_1, region::EU_WEST_2, region::EU_WEST_3, 
region::ME_SOUTH_1, region::SA_EAST_1,
+  region::US_EAST_1, region::US_EAST_2, region::US_GOV_EAST_1, 
region::US_GOV_WEST_1, region::US_WEST_1, region::US_WEST_2});
+const std::set<std::string> 
PutS3Object::STORAGE_CLASSES(minifi::utils::MapUtils::getKeys(minifi::aws::s3::STORAGE_CLASS_MAP));
+const std::set<std::string> 
PutS3Object::SERVER_SIDE_ENCRYPTIONS(minifi::utils::MapUtils::getKeys(minifi::aws::s3::SERVER_SIDE_ENCRYPTION_MAP));
+
+const core::Property PutS3Object::ObjectKey(
+  core::PropertyBuilder::createProperty("Object Key")
+    ->withDescription("The key of the S3 object. If none is given the filename 
attribute will be used by default.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::Bucket(
+  core::PropertyBuilder::createProperty("Bucket")
+    ->withDescription("The S3 bucket")
+    ->isRequired(true)
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ContentType(
+  core::PropertyBuilder::createProperty("Content Type")
+    ->withDescription("Sets the Content-Type HTTP header indicating the type 
of content stored in "
+                      "the associated object. The value of this header is a 
standard MIME type. "
+                      "If no content type is provided the default content type 
"
+                      "\"application/octet-stream\" will be used.")
+    ->supportsExpressionLanguage(true)
+    ->withDefaultValue<std::string>("application/octet-stream")
+    ->build());
+const core::Property PutS3Object::AccessKey(
+  core::PropertyBuilder::createProperty("Access Key")
+    ->withDescription("AWS account access key")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::SecretKey(

Review comment:
       Why do keys need to support EL?
   I don't think these could anyhow depend on flowfile or whatever expression, 
I expect them to be purely static data. 
   
   I think the same applies for most of the properties that are validated once 
(in onschedule)

##########
File path: extensions/aws/processors/PutS3Object.cpp
##########
@@ -0,0 +1,495 @@
+/**
+ * @file PutS3Object.cpp
+ * PutS3Object class implementation
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "PutS3Object.h"
+
+#include <string>
+#include <set>
+#include <memory>
+#include <map>
+
+#include "AWSCredentialsService.h"
+#include "properties/Properties.h"
+#include "utils/StringUtils.h"
+#include "utils/MapUtils.h"
+
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace aws {
+namespace processors {
+
+const std::set<std::string> 
PutS3Object::CANNED_ACLS(minifi::utils::MapUtils::getKeys(minifi::aws::s3::CANNED_ACL_MAP));
+const std::set<std::string> PutS3Object::REGIONS({region::AF_SOUTH_1, 
region::AP_EAST_1, region::AP_NORTHEAST_1,
+  region::AP_NORTHEAST_2, region::AP_NORTHEAST_3, region::AP_SOUTH_1, 
region::AP_SOUTHEAST_1, region::AP_SOUTHEAST_2,
+  region::CA_CENTRAL_1, region::CN_NORTH_1, region::CN_NORTHWEST_1, 
region::EU_CENTRAL_1, region::EU_NORTH_1,
+  region::EU_SOUTH_1, region::EU_WEST_1, region::EU_WEST_2, region::EU_WEST_3, 
region::ME_SOUTH_1, region::SA_EAST_1,
+  region::US_EAST_1, region::US_EAST_2, region::US_GOV_EAST_1, 
region::US_GOV_WEST_1, region::US_WEST_1, region::US_WEST_2});
+const std::set<std::string> 
PutS3Object::STORAGE_CLASSES(minifi::utils::MapUtils::getKeys(minifi::aws::s3::STORAGE_CLASS_MAP));
+const std::set<std::string> 
PutS3Object::SERVER_SIDE_ENCRYPTIONS(minifi::utils::MapUtils::getKeys(minifi::aws::s3::SERVER_SIDE_ENCRYPTION_MAP));
+
+const core::Property PutS3Object::ObjectKey(
+  core::PropertyBuilder::createProperty("Object Key")
+    ->withDescription("The key of the S3 object. If none is given the filename 
attribute will be used by default.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::Bucket(
+  core::PropertyBuilder::createProperty("Bucket")
+    ->withDescription("The S3 bucket")
+    ->isRequired(true)
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ContentType(
+  core::PropertyBuilder::createProperty("Content Type")
+    ->withDescription("Sets the Content-Type HTTP header indicating the type 
of content stored in "
+                      "the associated object. The value of this header is a 
standard MIME type. "
+                      "If no content type is provided the default content type 
"
+                      "\"application/octet-stream\" will be used.")
+    ->supportsExpressionLanguage(true)
+    ->withDefaultValue<std::string>("application/octet-stream")
+    ->build());
+const core::Property PutS3Object::AccessKey(
+  core::PropertyBuilder::createProperty("Access Key")
+    ->withDescription("AWS account access key")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::SecretKey(
+  core::PropertyBuilder::createProperty("Secret Key")
+    ->withDescription("AWS account secret key")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::CredentialsFile(
+  core::PropertyBuilder::createProperty("Credentials File")
+    ->withDescription("Path to a file containing AWS access key and secret key 
in properties file format. Properties used: accessKey and secretKey")
+    ->build());
+const core::Property PutS3Object::AWSCredentialsProviderService(
+  core::PropertyBuilder::createProperty("AWS Credentials Provider service")
+    ->withDescription("The name of the AWS Credentials Provider controller 
service that is used to obtain AWS credentials.")
+    ->build());
+const core::Property PutS3Object::StorageClass(
+  core::PropertyBuilder::createProperty("Storage Class")
+    ->isRequired(true)
+    ->withDefaultValue<std::string>("Standard")
+    ->withAllowableValues<std::string>(PutS3Object::STORAGE_CLASSES)
+    ->withDescription("AWS S3 Storage Class")
+    ->build());
+const core::Property PutS3Object::Region(
+  core::PropertyBuilder::createProperty("Region")
+    ->isRequired(true)
+    ->withDefaultValue<std::string>(region::US_WEST_2)
+    ->withAllowableValues<std::string>(PutS3Object::REGIONS)
+    ->withDescription("AWS Region")
+    ->build());
+const core::Property PutS3Object::CommunicationsTimeout(
+  core::PropertyBuilder::createProperty("Communications Timeout")
+    ->isRequired(true)
+    ->withDefaultValue<core::TimePeriodValue>("30 sec")
+    ->withDescription("")
+    ->build());
+const core::Property PutS3Object::FullControlUserList(
+  core::PropertyBuilder::createProperty("FullControl User List")
+    ->withDescription("A comma-separated list of Amazon User ID's or E-mail 
addresses that specifies who should have Full Control for an object.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ReadPermissionUserList(
+  core::PropertyBuilder::createProperty("Read Permission User List")
+    ->withDescription("A comma-separated list of Amazon User ID's or E-mail 
addresses that specifies who should have Read Access for an object.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ReadACLUserList(
+  core::PropertyBuilder::createProperty("Read ACL User List")
+    ->withDescription("A comma-separated list of Amazon User ID's or E-mail 
addresses that specifies who should have permissions to read "
+                      "the Access Control List for an object.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::WriteACLUserList(
+  core::PropertyBuilder::createProperty("Write ACL User List")
+    ->withDescription("A comma-separated list of Amazon User ID's or E-mail 
addresses that specifies who should have permissions to change "
+                      "the Access Control List for an object.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::CannedACL(
+  core::PropertyBuilder::createProperty("Canned ACL")
+    ->withDescription("Amazon Canned ACL for an object. Allowed values: 
BucketOwnerFullControl, BucketOwnerRead, AuthenticatedRead, "
+                      "PublicReadWrite, PublicRead, Private, AwsExecRead; will 
be ignored if any other ACL/permission property is specified.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::EndpointOverrideURL(
+  core::PropertyBuilder::createProperty("Endpoint Override URL")
+    ->withDescription("Endpoint URL to use instead of the AWS default 
including scheme, host, "
+                      "port, and path. The AWS libraries select an endpoint 
URL based on the AWS "
+                      "region, but this property overrides the selected 
endpoint URL, allowing use "
+                      "with other S3-compatible endpoints.")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ServerSideEncryption(
+  core::PropertyBuilder::createProperty("Server Side Encryption")
+    ->isRequired(true)
+    ->withDefaultValue<std::string>("None")
+    ->withAllowableValues<std::string>(PutS3Object::SERVER_SIDE_ENCRYPTIONS)
+    ->withDescription("Specifies the algorithm used for server side 
encryption.")
+    ->build());
+const core::Property PutS3Object::ProxyHost(
+  core::PropertyBuilder::createProperty("Proxy Host")
+    ->withDescription("Proxy host name or IP")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ProxyPort(
+  core::PropertyBuilder::createProperty("Proxy Port")
+    ->withDescription("The port number of the proxy host")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ProxyUsername(
+    core::PropertyBuilder::createProperty("Proxy Username")
+    ->withDescription("Username to set when authenticating against proxy")
+    ->supportsExpressionLanguage(true)
+    ->build());
+const core::Property PutS3Object::ProxyPassword(
+  core::PropertyBuilder::createProperty("Proxy Password")
+    ->withDescription("Password to set when authenticating against proxy")
+    ->supportsExpressionLanguage(true)
+    ->build());
+
+const core::Relationship PutS3Object::Success("success", "FlowFiles are routed 
to success relationship");
+const core::Relationship PutS3Object::Failure("failure", "FlowFiles are routed 
to failure relationship");
+
+void PutS3Object::initialize() {
+  // Set the supported properties
+  std::set<core::Property> properties;
+  properties.insert(ObjectKey);
+  properties.insert(Bucket);
+  properties.insert(ContentType);
+  properties.insert(AccessKey);
+  properties.insert(SecretKey);
+  properties.insert(CredentialsFile);
+  properties.insert(AWSCredentialsProviderService);
+  properties.insert(StorageClass);
+  properties.insert(Region);
+  properties.insert(CommunicationsTimeout);
+  properties.insert(FullControlUserList);
+  properties.insert(ReadPermissionUserList);
+  properties.insert(ReadACLUserList);
+  properties.insert(WriteACLUserList);
+  properties.insert(CannedACL);
+  properties.insert(EndpointOverrideURL);
+  properties.insert(ServerSideEncryption);
+  properties.insert(ProxyHost);
+  properties.insert(ProxyPort);
+  properties.insert(ProxyUsername);
+  properties.insert(ProxyPassword);
+  setSupportedProperties(properties);
+  // Set the supported relationships
+  std::set<core::Relationship> relationships;
+  relationships.insert(Failure);
+  relationships.insert(Success);
+  setSupportedRelationships(relationships);
+}
+
+minifi::utils::optional<Aws::Auth::AWSCredentials> 
PutS3Object::getAWSCredentialsFromControllerService(const 
std::shared_ptr<core::ProcessContext> &context) const {
+  std::string service_name;
+  if (context->getProperty(AWSCredentialsProviderService.getName(), 
service_name) && !service_name.empty()) {
+    std::shared_ptr<core::controller::ControllerService> service = 
context->getControllerService(service_name);
+    if (nullptr != service) {
+      auto aws_credentials_service = 
std::dynamic_pointer_cast<minifi::aws::controllers::AWSCredentialsService>(service);
+      if (aws_credentials_service) {
+        return 
minifi::utils::make_optional<Aws::Auth::AWSCredentials>(aws_credentials_service->getAWSCredentials());
+      }
+    }
+  }
+  return minifi::utils::nullopt;
+}
+
+minifi::utils::optional<Aws::Auth::AWSCredentials> 
PutS3Object::getAWSCredentialsFromProperties(
+    const std::shared_ptr<core::ProcessContext> &context,
+    const std::shared_ptr<core::FlowFile> &flow_file) const {
+  std::string access_key;
+  context->getProperty(AccessKey, access_key, flow_file);
+  std::string secret_key;
+  context->getProperty(SecretKey, secret_key, flow_file);
+  if (!access_key.empty() && !secret_key.empty()) {
+    Aws::Auth::AWSCredentials creds(access_key, secret_key);
+    return minifi::utils::make_optional<Aws::Auth::AWSCredentials>(creds);
+  }
+  return minifi::utils::nullopt;
+}
+
+minifi::utils::optional<Aws::Auth::AWSCredentials> 
PutS3Object::getAWSCredentialsFromFile(const 
std::shared_ptr<core::ProcessContext> &context) const {
+  std::string credential_file;
+  if (context->getProperty(CredentialsFile.getName(), credential_file) && 
!credential_file.empty()) {
+    auto properties = std::make_shared<minifi::Properties>();
+    properties->loadConfigureFile(credential_file.c_str());
+    std::string access_key;
+    std::string secret_key;
+    if (properties->getString("accessKey", access_key) && !access_key.empty() 
&& properties->getString("secretKey", secret_key) && !secret_key.empty()) {
+      Aws::Auth::AWSCredentials creds(access_key, secret_key);
+      return minifi::utils::make_optional<Aws::Auth::AWSCredentials>(creds);
+    }
+  }
+  return minifi::utils::nullopt;
+}
+
+minifi::utils::optional<Aws::Auth::AWSCredentials> 
PutS3Object::getAWSCredentials(
+    const std::shared_ptr<core::ProcessContext> &context,
+    const std::shared_ptr<core::FlowFile> &flow_file) const {
+  auto prop_cred = getAWSCredentialsFromProperties(context, flow_file);
+  if (prop_cred) {
+    logger_->log_info("AWS Credentials successfully set from properties");
+    return prop_cred.value();
+  }
+
+  auto file_cred = getAWSCredentialsFromFile(context);
+  if (file_cred) {
+    logger_->log_info("AWS Credentials successfully set from file");
+    return file_cred.value();
+  }
+
+  auto service_cred = getAWSCredentialsFromControllerService(context);
+  if (service_cred) {
+    logger_->log_info("AWS Credentials successfully set from controller 
service");
+    return service_cred.value();
+  }
+
+  return minifi::utils::nullopt;
+}
+
+void PutS3Object::fillUserMetadata(const std::shared_ptr<core::ProcessContext> 
&context) {
+  const auto &dynamic_prop_keys = context->getDynamicPropertyKeys();
+  bool first_property = true;
+  for (const auto &prop_key : dynamic_prop_keys) {
+    std::string prop_value = "";
+    if (context->getDynamicProperty(prop_key, prop_value) && 
!prop_value.empty()) {
+      logger_->log_debug("PutS3Object: DynamicProperty: [%s] -> [%s]", 
prop_key, prop_value);
+      put_s3_request_params_.user_metadata_map.emplace(prop_key, prop_value);
+      if (first_property) {
+        user_metadata_ = prop_key + "=" + prop_value;
+        first_property = false;
+      } else {
+        user_metadata_ += "," + prop_key + "=" + prop_value;
+      }
+    }
+  }
+  logger_->log_debug("PutS3Object: User metadata [%s]", user_metadata_);
+}
+
+bool PutS3Object::setProxy(const std::shared_ptr<core::ProcessContext> 
&context, const std::shared_ptr<core::FlowFile> &flow_file) {
+  aws::s3::ProxyOptions proxy;
+  context->getProperty(ProxyHost, proxy.host, flow_file);
+  std::string port_str;
+  if (context->getProperty(ProxyPort, port_str, flow_file) && 
!port_str.empty() && !core::Property::StringToInt(port_str, proxy.port)) {
+    logger_->log_error("Proxy port invalid");
+    return false;
+  }
+  context->getProperty(ProxyUsername, proxy.username, flow_file);
+  context->getProperty(ProxyPassword, proxy.password, flow_file);
+  if (!proxy.host.empty()) {
+    s3_wrapper_->setProxy(proxy);
+    logger_->log_info("Proxy for PutS3Object was set.");
+  }
+  return true;
+}
+
+void PutS3Object::onSchedule(const std::shared_ptr<core::ProcessContext> 
&context, const std::shared_ptr<core::ProcessSessionFactory> &sessionFactory) {
+  if (!context->getProperty(Bucket.getName(), put_s3_request_params_.bucket) 
|| put_s3_request_params_.bucket.empty()) {
+    throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Bucket property missing or 
invalid");
+  }
+  logger_->log_debug("PutS3Object: Bucket [%s]", 
put_s3_request_params_.bucket);
+
+  if (!context->getProperty(StorageClass.getName(), 
put_s3_request_params_.storage_class)
+      || put_s3_request_params_.storage_class.empty()
+      || STORAGE_CLASSES.find(put_s3_request_params_.storage_class) == 
STORAGE_CLASSES.end()) {
+    throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Storage Class property 
missing or invalid");
+  }
+  logger_->log_debug("PutS3Object: Storage Class [%s]", 
put_s3_request_params_.storage_class);
+
+  std::string value;
+  if (!context->getProperty(Region.getName(), value) || value.empty() || 
REGIONS.find(value) == REGIONS.end()) {
+    throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Region property missing or 
invalid");
+  }
+  s3_wrapper_->setRegion(value);
+  logger_->log_debug("PutS3Object: Region [%s]", value);
+
+  uint64_t timeout_val;
+  if (context->getProperty(CommunicationsTimeout.getName(), value) && 
!value.empty() && core::Property::getTimeMSFromString(value, timeout_val)) {
+    s3_wrapper_->setTimeout(timeout_val);
+    logger_->log_debug("PutS3Object: Communications Timeout [%d]", 
timeout_val);
+  } else {
+    throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Communications Timeout 
missing or invalid");
+  }
+
+  if (!context->getProperty(ServerSideEncryption.getName(), 
put_s3_request_params_.server_side_encryption)
+      || put_s3_request_params_.server_side_encryption.empty()
+      || 
SERVER_SIDE_ENCRYPTIONS.find(put_s3_request_params_.server_side_encryption) == 
SERVER_SIDE_ENCRYPTIONS.end()) {
+    throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Server Side Encryption 
property missing or invalid");
+  }
+  logger_->log_debug("PutS3Object: Server Side Encryption [%s]", 
put_s3_request_params_.server_side_encryption);
+
+  fillUserMetadata(context);
+}
+
+std::string PutS3Object::parseAccessControlList(const std::string 
&comma_separated_list) const {
+  std::string result_list;
+  bool is_first = true;
+  for (const auto& user : 
minifi::utils::StringUtils::split(comma_separated_list, ",")) {
+    if (is_first) {
+      is_first = false;
+    } else {
+      result_list += ", ";

Review comment:
       This is already implemented in join. 
   
   I bit more simple way of doing this:
   ```
   auto users : minifi::utils::StringUtils::split(comma_separated_list, ",")
   for(auto& user: users) {
         auto trimmed_user = minifi::utils::StringUtils::trim(user);
       if (trimmed_user.find('@') != std::string::npos) {
         user = "emailAddress=\"" + trimmed_user + "\"";
       } else {
         user += "id=" + trimmed_user;
       }
   }
   return minifi::utils::StringUtils::join(", ", users);
   ```

##########
File path: extensions/aws/utils/AWSSdkLogger.cpp
##########
@@ -0,0 +1,105 @@
+/**
+ * @file AWSSdkLogger.cpp
+ * AWSSdkLogger class implementation
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "AWSSdkLogger.h"
+
+#include "aws/core/utils/logging/LogLevel.h"
+
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace aws {
+namespace utils {
+
+Aws::Utils::Logging::LogLevel AWSSdkLogger::GetLogLevel() const {
+  if (logger_->should_log(minifi::core::logging::LOG_LEVEL::trace))
+    return Aws::Utils::Logging::LogLevel::Trace;
+  if (logger_->should_log(minifi::core::logging::LOG_LEVEL::debug))
+    return Aws::Utils::Logging::LogLevel::Debug;
+  if (logger_->should_log(minifi::core::logging::LOG_LEVEL::info))
+    return Aws::Utils::Logging::LogLevel::Info;
+  if (logger_->should_log(minifi::core::logging::LOG_LEVEL::warn))
+    return Aws::Utils::Logging::LogLevel::Warn;
+  if (logger_->should_log(minifi::core::logging::LOG_LEVEL::err))
+    return Aws::Utils::Logging::LogLevel::Error;
+  if (logger_->should_log(minifi::core::logging::LOG_LEVEL::critical))
+    return Aws::Utils::Logging::LogLevel::Fatal;
+  return Aws::Utils::Logging::LogLevel::Off;
+}
+
+void AWSSdkLogger::Log(Aws::Utils::Logging::LogLevel log_level, const char* 
tag, const char* format_str, ...) {
+  switch (log_level) {
+    case Aws::Utils::Logging::LogLevel::Trace:
+      logger_->log_trace("[%s] %s", tag, format_str);
+      break;
+    case Aws::Utils::Logging::LogLevel::Debug:
+      logger_->log_debug("[%s] %s", tag, format_str);
+      break;
+    case Aws::Utils::Logging::LogLevel::Info:
+      logger_->log_info("[%s] %s", tag, format_str);
+      break;
+    case Aws::Utils::Logging::LogLevel::Warn:
+      logger_->log_warn("[%s] %s", tag, format_str);
+      break;
+    case Aws::Utils::Logging::LogLevel::Error:
+      logger_->log_error("[%s] %s", tag, format_str);
+      break;
+    case Aws::Utils::Logging::LogLevel::Fatal:
+      logger_->log_error("[%s] %s", tag, format_str);
+      break;
+    default:
+      break;
+  }
+}
+
+void AWSSdkLogger::LogStream(Aws::Utils::Logging::LogLevel log_level, const 
char* tag, const Aws::OStringStream &message_stream) {
+  switch (log_level) {

Review comment:
       Instead of copy-pasting the logic, can't this simply call the one above?




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