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#include "query_saver.hpp"
#include "platform/settings.hpp"
#include "coding/base64.hpp"
#include "coding/reader.hpp"
#include "coding/writer.hpp"
#include "coding/write_to_sink.hpp"
#include "base/logging.hpp"
#include "base/string_utils.hpp"
#include <cstdint>
#include <cstring>
#include <limits>
#include <memory>
using namespace std;
namespace
{
char constexpr kSettingsKey[] = "UserQueries";
using TLength = uint16_t;
TLength constexpr kMaxSuggestionsCount = 10;
// Reader from memory that throws exceptions.
class SecureMemReader : public Reader
{
void CheckPosAndSize(uint64_t pos, uint64_t size) const
{
if (pos + size > m_size || size > numeric_limits<size_t>::max())
MYTHROW(SizeException, (pos, size, m_size) );
}
public:
// Construct from block of memory.
SecureMemReader(void const * pData, size_t size)
: m_pData(static_cast<char const *>(pData)), m_size(size)
{
}
inline uint64_t Size() const override
{
return m_size;
}
inline void Read(uint64_t pos, void * p, size_t size) const override
{
CheckPosAndSize(pos, size);
memcpy(p, m_pData + pos, size);
}
inline SecureMemReader SubReader(uint64_t pos, uint64_t size) const
{
CheckPosAndSize(pos, size);
return SecureMemReader(m_pData + pos, static_cast<size_t>(size));
}
inline unique_ptr<Reader> CreateSubReader(uint64_t pos, uint64_t size) const override
{
CheckPosAndSize(pos, size);
return make_unique<SecureMemReader>(m_pData + pos, static_cast<size_t>(size));
}
private:
char const * m_pData;
size_t m_size;
};
} // namespace
namespace search
{
QuerySaver::QuerySaver()
{
Load();
}
void QuerySaver::Add(TSearchRequest const & query)
{
// This change was made just before release, so we don't use untested search normalization methods.
//TODO (ldragunov) Rewrite to normalized requests.
TSearchRequest trimmedQuery(query);
strings::Trim(trimmedQuery.first);
strings::Trim(trimmedQuery.second);
auto trimmedComparator = [&trimmedQuery](TSearchRequest request)
{
strings::Trim(request.first);
strings::Trim(request.second);
return trimmedQuery == request;
};
// Remove items if needed.
auto const it = find_if(m_topQueries.begin(), m_topQueries.end(), trimmedComparator);
if (it != m_topQueries.end())
m_topQueries.erase(it);
else if (m_topQueries.size() >= kMaxSuggestionsCount)
m_topQueries.pop_back();
// Add new query and save it to drive.
m_topQueries.push_front(query);
Save();
}
void QuerySaver::Clear()
{
m_topQueries.clear();
settings::Delete(kSettingsKey);
}
void QuerySaver::Serialize(string & data) const
{
vector<uint8_t> rawData;
MemWriter<vector<uint8_t>> writer(rawData);
TLength size = m_topQueries.size();
WriteToSink(writer, size);
for (auto const & query : m_topQueries)
{
size = query.first.size();
WriteToSink(writer, size);
writer.Write(query.first.c_str(), size);
size = query.second.size();
WriteToSink(writer, size);
writer.Write(query.second.c_str(), size);
}
data = base64::Encode(string(rawData.begin(), rawData.end()));
}
void QuerySaver::Deserialize(string const & data)
{
string decodedData = base64::Decode(data);
SecureMemReader rawReader(decodedData.c_str(), decodedData.size());
ReaderSource<SecureMemReader> reader(rawReader);
TLength queriesCount = ReadPrimitiveFromSource<TLength>(reader);
queriesCount = min(queriesCount, kMaxSuggestionsCount);
for (TLength i = 0; i < queriesCount; ++i)
{
TLength localeLength = ReadPrimitiveFromSource<TLength>(reader);
vector<char> locale(localeLength);
reader.Read(&locale[0], localeLength);
TLength stringLength = ReadPrimitiveFromSource<TLength>(reader);
vector<char> str(stringLength);
reader.Read(&str[0], stringLength);
m_topQueries.emplace_back(make_pair(string(&locale[0], localeLength),
string(&str[0], stringLength)));
}
}
void QuerySaver::Save()
{
string data;
Serialize(data);
settings::Set(kSettingsKey, data);
}
void QuerySaver::Load()
{
string hexData;
if (!settings::Get(kSettingsKey, hexData) || hexData.empty())
return;
try
{
Deserialize(hexData);
}
catch (Reader::SizeException const & /* exception */)
{
Clear();
LOG(LWARNING, ("Search history data corrupted! Creating new one."));
}
}
} // namesapce search
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