// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/quic/crypto/quic_server_info.h"

#include <limits>

#include "base/pickle.h"

using std::string;

namespace {

const int kQuicCryptoConfigVersion = 1;

}  // namespace

namespace net {

QuicServerInfo::State::State() {}

QuicServerInfo::State::~State() {}

void QuicServerInfo::State::Clear() {
  server_config.clear();
  source_address_token.clear();
  server_config_sig.clear();
  certs.clear();
}

QuicServerInfo::QuicServerInfo(const QuicServerId& server_id)
    : server_id_(server_id) {
}

QuicServerInfo::~QuicServerInfo() {
}

const QuicServerInfo::State& QuicServerInfo::state() const {
  return state_;
}

QuicServerInfo::State* QuicServerInfo::mutable_state() {
  return &state_;
}

bool QuicServerInfo::Parse(const string& data) {
  State* state = mutable_state();

  state->Clear();

  bool r = ParseInner(data);
  if (!r)
    state->Clear();
  return r;
}

bool QuicServerInfo::ParseInner(const string& data) {
  State* state = mutable_state();

  // No data was read from the disk cache.
  if (data.empty()) {
    return false;
  }

  Pickle p(data.data(), data.size());
  PickleIterator iter(p);

  int version = -1;
  if (!iter.ReadInt(&version)) {
    DVLOG(1) << "Missing version";
    return false;
  }

  if (version != kQuicCryptoConfigVersion) {
    DVLOG(1) << "Unsupported version";
    return false;
  }

  if (!iter.ReadString(&state->server_config)) {
    DVLOG(1) << "Malformed server_config";
    return false;
  }
  if (!iter.ReadString(&state->source_address_token)) {
    DVLOG(1) << "Malformed source_address_token";
    return false;
  }
  if (!iter.ReadString(&state->server_config_sig)) {
    DVLOG(1) << "Malformed server_config_sig";
    return false;
  }

  // Read certs.
  uint32 num_certs;
  if (!iter.ReadUInt32(&num_certs)) {
    DVLOG(1) << "Malformed num_certs";
    return false;
  }

  for (uint32 i = 0; i < num_certs; i++) {
    string cert;
    if (!iter.ReadString(&cert)) {
      DVLOG(1) << "Malformed cert";
      return false;
    }
    state->certs.push_back(cert);
  }

  return true;
}

string QuicServerInfo::Serialize() {
  string pickled_data = SerializeInner();
  state_.Clear();
  return pickled_data;
}

string QuicServerInfo::SerializeInner() const {
  Pickle p(sizeof(Pickle::Header));

  if (!p.WriteInt(kQuicCryptoConfigVersion) ||
      !p.WriteString(state_.server_config) ||
      !p.WriteString(state_.source_address_token) ||
      !p.WriteString(state_.server_config_sig) ||
      state_.certs.size() > std::numeric_limits<uint32>::max() ||
      !p.WriteUInt32(state_.certs.size())) {
    return string();
  }

  for (size_t i = 0; i < state_.certs.size(); i++) {
    if (!p.WriteString(state_.certs[i])) {
      return string();
    }
  }

  return string(reinterpret_cast<const char *>(p.data()), p.size());
}

QuicServerInfoFactory::~QuicServerInfoFactory() {}

}  // namespace net