[GitHub] [nifi-minifi-cpp] fgerlits commented on a change in pull request #1123: MINIFICPP-1579 Add config file checksums to the heartbeat

[GitBox <gi...@apache.org>]

fgerlits commented on a change in pull request #1123:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1123#discussion_r662800880



##########
File path: libminifi/src/utils/ChecksumCalculator.cpp
##########
@@ -0,0 +1,98 @@
+/**
+ * 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 "utils/ChecksumCalculator.h"
+
+#include <fstream>
+
+#include "sodium/crypto_hash_sha256.h"
+#include "utils/file/FileUtils.h"
+#include "utils/StringUtils.h"
+
+namespace {
+
+const std::string AGENT_IDENTIFIER_KEY = "nifi.c2.agent.identifier=";
+
+}
+
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace utils {
+
+constexpr const char* ChecksumCalculator::CHECKSUM_TYPE;
+constexpr size_t ChecksumCalculator::LENGTH_OF_HASH_IN_BYTES;
+
+void ChecksumCalculator::setFileLocation(const std::string& file_location) {
+  file_location_ = file_location;
+  file_name_ = utils::file::get_child_path(file_location);
+}
+
+std::string ChecksumCalculator::getFileName() const {
+  if (!file_name_) {
+    throw std::logic_error("File name not set in ChecksumCalculator!");
+  }
+  return *file_name_;
+}
+
+std::string ChecksumCalculator::getChecksum() {
+  if (!file_location_) {
+    throw std::logic_error("File location not set in ChecksumCalculator!");
+  }
+  if (!checksum_) {
+    checksum_ = computeChecksum(*file_location_);
+  }
+  return *checksum_;
+}
+
+std::string ChecksumCalculator::computeChecksum(const std::string& file_location) {
+  using org::apache::nifi::minifi::utils::StringUtils;
+
+  std::ifstream input_file{file_location, std::ios::in | std::ios::binary};
+  if (!input_file.is_open()) {
+    throw std::runtime_error(StringUtils::join_pack("Could not open config file '", file_location, "' to compute the checksum: ", std::strerror(errno)));
+  }
+
+  crypto_hash_sha256_state state;
+  crypto_hash_sha256_init(&state);
+
+  std::string line;
+  while (std::getline(input_file, line)) {
+    if (StringUtils::startsWith(line, AGENT_IDENTIFIER_KEY)) {

Review comment:
       added a comment in https://github.com/apache/nifi-minifi-cpp/pull/1123/commits/13494a5ce0551e2bef85ade283d6d524ad502e7e




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