/*
 *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <iostream>  // NOLINT

#include "webrtc/p2p/base/basicpacketsocketfactory.h"
#include "webrtc/p2p/base/turnserver.h"
#include "webrtc/base/asyncudpsocket.h"
#include "webrtc/base/optionsfile.h"
#include "webrtc/base/stringencode.h"
#include "webrtc/base/thread.h"

static const char kSoftware[] = "libjingle TurnServer";

class TurnFileAuth : public cricket::TurnAuthInterface {
 public:
  explicit TurnFileAuth(const std::string& path) : file_(path) {
    file_.Load();
  }
  virtual bool GetKey(const std::string& username, const std::string& realm,
                      std::string* key) {
    // File is stored as lines of <username>=<HA1>.
    // Generate HA1 via "echo -n "<username>:<realm>:<password>" | md5sum"
    std::string hex;
    bool ret = file_.GetStringValue(username, &hex);
    if (ret) {
      char buf[32];
      size_t len = rtc::hex_decode(buf, sizeof(buf), hex);
      *key = std::string(buf, len);
    }
    return ret;
  }
 private:
  rtc::OptionsFile file_;
};

int main(int argc, char **argv) {
  if (argc != 5) {
    std::cerr << "usage: turnserver int-addr ext-ip realm auth-file"
              << std::endl;
    return 1;
  }

  rtc::SocketAddress int_addr;
  if (!int_addr.FromString(argv[1])) {
    std::cerr << "Unable to parse IP address: " << argv[1] << std::endl;
    return 1;
  }

  rtc::IPAddress ext_addr;
  if (!IPFromString(argv[2], &ext_addr)) {
    std::cerr << "Unable to parse IP address: " << argv[2] << std::endl;
    return 1;
  }

  rtc::Thread* main = rtc::Thread::Current();
  rtc::AsyncUDPSocket* int_socket =
      rtc::AsyncUDPSocket::Create(main->socketserver(), int_addr);
  if (!int_socket) {
    std::cerr << "Failed to create a UDP socket bound at"
              << int_addr.ToString() << std::endl;
    return 1;
  }

  cricket::TurnServer server(main);
  TurnFileAuth auth(argv[4]);
  server.set_realm(argv[3]);
  server.set_software(kSoftware);
  server.set_auth_hook(&auth);
  server.AddInternalSocket(int_socket, cricket::PROTO_UDP);
  server.SetExternalSocketFactory(new rtc::BasicPacketSocketFactory(),
                                  rtc::SocketAddress(ext_addr, 0));

  std::cout << "Listening internally at " << int_addr.ToString() << std::endl;

  main->Run();
  return 0;
}