lokinet/llarp/rpc/json_binary_proxy.cpp

#include "json_binary_proxy.hpp"
#include <oxenc/hex.h>
#include <oxenc/base64.h>

namespace llarp::rpc
{

  void
  load_binary_parameter_impl(
      std::string_view bytes, size_t raw_size, bool allow_raw, uint8_t* val_data)
  {
    if (allow_raw && bytes.size() == raw_size)
    {
      std::memcpy(val_data, bytes.data(), bytes.size());
      return;
    }
    else if (bytes.size() == raw_size * 2)
    {
      if (oxenc::is_hex(bytes))
      {
        oxenc::from_hex(bytes.begin(), bytes.end(), val_data);
        return;
      }
    }
    else
    {
      const size_t b64_padded = (raw_size + 2) / 3 * 4;
      const size_t b64_padding = raw_size % 3 == 1 ? 2 : raw_size % 3 == 2 ? 1 : 0;
      const size_t b64_unpadded = b64_padded - b64_padding;
      const std::string_view b64_padding_string = b64_padding == 2 ? "=="sv
          : b64_padding == 1                                       ? "="sv
                                                                   : ""sv;
      if (bytes.size() == b64_unpadded
          || (b64_padding > 0 && bytes.size() == b64_padded
              && bytes.substr(b64_unpadded) == b64_padding_string))
      {
        if (oxenc::is_base64(bytes))
        {
          oxenc::from_base64(bytes.begin(), bytes.end(), val_data);
          return;
        }
      }
    }

    throw std::runtime_error{"Invalid binary value: unexpected size and/or encoding"};
  }

  nlohmann::json&
  json_binary_proxy::operator=(std::string_view binary_data)
  {
    switch (format)
    {
      case fmt::bt:
        return e = binary_data;
      case fmt::hex:
        return e = oxenc::to_hex(binary_data);
      case fmt::base64:
        return e = oxenc::to_base64(binary_data);
    }
    throw std::runtime_error{"Internal error: invalid binary encoding"};
  }

}  // namespace llarp::rpc