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https://issues.apache.org/jira/browse/MINIFICPP-681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16701789#comment-16701789
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ASF GitHub Bot commented on MINIFICPP-681:
------------------------------------------
Github user phrocker commented on a diff in the pull request:
https://github.com/apache/nifi-minifi-cpp/pull/445#discussion_r237056704
--- Diff: libminifi/include/processors/HashContent.h ---
@@ -0,0 +1,196 @@
+/**
+ * @file HashContent.h
+ * HashContent 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.
+ */
+#ifndef NIFI_MINIFI_CPP_HashContent_H
+#define NIFI_MINIFI_CPP_HashContent_H
+
+#ifdef OPENSSL_SUPPORT
+
+#include <iomanip>
+#include <map>
+#include <memory>
+#include <string>
+#include <sstream>
+#include <utility>
+#include <stdint.h>
+
+#include <openssl/md5.h>
+#include <openssl/sha.h>
+
+#include "FlowFileRecord.h"
+#include "core/Processor.h"
+#include "core/ProcessSession.h"
+#include "core/Resource.h"
+#include "io/BaseStream.h"
+
+using HashReturnType = std::pair<std::string, int64_t>;
+
+namespace {
+#define HASH_BUFFER_SIZE 16384
+
+ std::string digestToString(const unsigned char * const digest, size_t
size) {
+ std::stringstream ss;
+ for(int i = 0; i < size; i++)
+ {
+ ss << std::uppercase << std::hex << std::setw(2) <<
std::setfill('0') << (int)digest[i];
+ }
+ return ss.str();
+ }
+
+ HashReturnType MD5Hash(const
std::shared_ptr<org::apache::nifi::minifi::io::BaseStream>& stream) {
+ HashReturnType ret_val;
+ ret_val.second = 0;
+ uint8_t buffer[HASH_BUFFER_SIZE];
+ MD5_CTX context;
+ MD5_Init(&context);
+
+ size_t ret = 0;
+ do {
+ ret = stream->readData(buffer, HASH_BUFFER_SIZE);
+ if(ret > 0) {
+ MD5_Update(&context, buffer, ret);
+ ret_val.second += ret;
+ }
+ } while(ret > 0);
+
+ if (ret_val.second > 0) {
+ unsigned char digest[MD5_DIGEST_LENGTH];
+ MD5_Final(digest, &context);
+ ret_val.first = digestToString(digest, MD5_DIGEST_LENGTH);
+ }
+ return ret_val;
+ }
+
+ HashReturnType SHA1Hash(const
std::shared_ptr<org::apache::nifi::minifi::io::BaseStream>& stream) {
+ HashReturnType ret_val;
+ ret_val.second = 0;
+ uint8_t buffer[HASH_BUFFER_SIZE];
+ SHA_CTX context;
+ SHA1_Init(&context);
+
+ size_t ret = 0;
+ do {
+ ret = stream->readData(buffer, HASH_BUFFER_SIZE);
+ if(ret > 0) {
+ SHA1_Update(&context, buffer, ret);
+ ret_val.second += ret;
+ }
+ } while(ret > 0);
+
+ if (ret_val.second > 0) {
+ unsigned char digest[SHA_DIGEST_LENGTH];
+ SHA1_Final(digest, &context);
+ ret_val.first = digestToString(digest, SHA_DIGEST_LENGTH);
+ }
+ return ret_val;
+ }
+
+ HashReturnType SHA256Hash(const
std::shared_ptr<org::apache::nifi::minifi::io::BaseStream>& stream) {
+ HashReturnType ret_val;
+ ret_val.second = 0;
+ uint8_t buffer[HASH_BUFFER_SIZE];
+ SHA256_CTX context;
+ SHA256_Init(&context);
+
+ size_t ret ;
+ do {
+ ret = stream->readData(buffer, HASH_BUFFER_SIZE);
+ if(ret > 0) {
+ SHA256_Update(&context, buffer, ret);
+ ret_val.second += ret;
+ }
+ } while(ret > 0);
+
+ if (ret_val.second > 0) {
+ unsigned char digest[SHA256_DIGEST_LENGTH];
+ SHA256_Final(digest, &context);
+ ret_val.first = digestToString(digest, SHA256_DIGEST_LENGTH);
+ }
+ return ret_val;
+ }
+}
+
+
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace processors {
+
+static const std::map<std::string, const
std::function<HashReturnType(const std::shared_ptr<io::BaseStream>&)>>
HashAlgos =
+ { {"MD5", MD5Hash}, {"SHA1", SHA1Hash}, {"SHA256", SHA256Hash} };
+
+//! HashContent Class
+class HashContent : public core::Processor {
+ public:
+ //! Constructor
+ /*!
+ * Create a new processor
+ */
+ explicit HashContent(std::string name, utils::Identifier uuid =
utils::Identifier())
+ : Processor(name, uuid)
+ {
+ logger_ = logging::LoggerFactory<HashContent>::getLogger();
+ }
+ //! Processor Name
+ static constexpr char const* ProcessorName = "HashContent";
+ //! Supported Properties
+ static core::Property HashAttribute;
+ static core::Property HashAlgorithm;
+ //! Supported Relationships
+ static core::Relationship Success;
+
+ void onSchedule(core::ProcessContext *context,
core::ProcessSessionFactory *sessionFactory) override;
--- End diff --
I'm not sure how I missed this before, but we can't use override in
libminifi due to some of the compilers in the environments we support not
having that support yet in their version of GCC. It's used in extensions, but
we kind of refrain from using this in libminifi until we can determine that
those environments have acquiesced to later standards.
> Add content hash processor
> --------------------------
>
> Key: MINIFICPP-681
> URL: https://issues.apache.org/jira/browse/MINIFICPP-681
> Project: NiFi MiNiFi C++
> Issue Type: Improvement
> Reporter: Arpad Boda
> Assignee: Arpad Boda
> Priority: Major
> Fix For: 0.6.0
>
>
> Add a new processor that supports hashing content and add the checksum to the
> flowfile as an attribute.
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