v2.0.2-rc (#27)

## v2.0.2-rc

### BREAKING CHANGES

* Refactored `config.json` - will need to verify configuration settings prior to mounting

### Issues

* \#12 \[Unit Test\] Complete all providers unit tests
* \#14 \[Unit Test\] SQLite mini-ORM unit tests and cleanup
* \#16 Add support for bucket name in Sia provider
* \#17 Update to common c++ build system
  * A single 64-bit Linux Jenkins server is used to build all Linux and Windows versions
  * All dependency sources are now included
  * MSVC is no longer supported
  * MSYS2 is required for building Windows binaries on Windows
  * OS X support is temporarily disabled
* \#19 \[bug\] Rename file is broken for files that are existing
* \#23 \[bug\] Incorrect file size displayed while upload is pending
* \#24 RocksDB implementations should be transactional
* \#25 Writes should block when maximum cache size is reached
* \#26 Complete ring buffer and direct download support

### Changes from v2.0.1-rc

* Ability to choose between RocksDB and SQLite databases
* Added direct reads and implemented download fallback
* Corrected file times on S3 and Sia providers
* Corrected handling of `chown()` and `chmod()`
* Fixed erroneous download of chunks after resize

Reviewed-on: #27

support/src/utils/encryption.cpp

@@ -0,0 +1,117 @@
+/*
+  Copyright <2018-2024> <scott.e.graves@protonmail.com>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+*/
+#if defined(PROJECT_ENABLE_LIBSODIUM) && defined(PROJECT_ENABLE_BOOST)
+
+#include "utils/encryption.hpp"
+
+#include "utils/collection.hpp"
+#include "utils/encrypting_reader.hpp"
+
+namespace repertory::utils::encryption {
+auto decrypt_file_path(std::string_view encryption_token,
+                       std::string &file_path) -> bool {
+  std::string decrypted_file_path{};
+  for (const auto &part : std::filesystem::path(file_path)) {
+    auto file_name = part.string();
+    if (file_name == "/") {
+      continue;
+    }
+
+    auto res = decrypt_file_name(encryption_token, file_name);
+    if (not res) {
+      return res;
+    }
+
+    decrypted_file_path += '/' + file_name;
+  }
+
+  file_path = decrypted_file_path;
+  return true;
+}
+
+auto decrypt_file_name(std::string_view encryption_token,
+                       std::string &file_name) -> bool {
+  data_buffer buffer;
+  if (not utils::collection::from_hex_string(file_name, buffer)) {
+    return false;
+  }
+
+  file_name.clear();
+  if (not utils::encryption::decrypt_data(encryption_token, buffer,
+                                          file_name)) {
+    return false;
+  }
+
+  return true;
+}
+
+#if defined(PROJECT_ENABLE_CURL)
+auto read_encrypted_range(const http_range &range,
+                          const utils::encryption::hash_256_t &key,
+                          reader_func_t reader_func, std::uint64_t total_size,
+                          data_buffer &data) -> bool {
+  const auto encrypted_chunk_size =
+      utils::encryption::encrypting_reader::get_encrypted_chunk_size();
+  const auto data_chunk_size =
+      utils::encryption::encrypting_reader::get_data_chunk_size();
+
+  const auto start_chunk =
+      static_cast<std::size_t>(range.begin / data_chunk_size);
+  const auto end_chunk = static_cast<std::size_t>(range.end / data_chunk_size);
+  auto remain = range.end - range.begin + 1U;
+  auto source_offset = static_cast<std::size_t>(range.begin % data_chunk_size);
+
+  for (std::size_t chunk = start_chunk; chunk <= end_chunk; chunk++) {
+    data_buffer cypher;
+    const auto start_offset = chunk * encrypted_chunk_size;
+    const auto end_offset = std::min(
+        start_offset + (total_size - (chunk * data_chunk_size)) +
+            encryption_header_size - 1U,
+        static_cast<std::uint64_t>(start_offset + encrypted_chunk_size - 1U));
+
+    if (not reader_func(cypher, start_offset, end_offset)) {
+      return false;
+    }
+
+    data_buffer source_buffer;
+    if (not utils::encryption::decrypt_data(key, cypher, source_buffer)) {
+      return false;
+    }
+    cypher.clear();
+
+    const auto data_size = static_cast<std::size_t>(std::min(
+        remain, static_cast<std::uint64_t>(data_chunk_size - source_offset)));
+    std::copy(std::next(source_buffer.begin(),
+                        static_cast<std::int64_t>(source_offset)),
+              std::next(source_buffer.begin(),
+                        static_cast<std::int64_t>(source_offset + data_size)),
+              std::back_inserter(data));
+    remain -= data_size;
+    source_offset = 0U;
+  }
+
+  return true;
+}
+#endif // defined(PROJECT_ENABLE_CURL)
+} // namespace repertory::utils::encryption
+
+#endif // defined(PROJECT_ENABLE_LIBSODIUM) && defined (PROJECT_ENABLE_BOOST)