/*
 *  Copyright 2017 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 "rtc_base/openssl_adapter.h"

#include <cstddef>
#include <cstdint>
#include <memory>
#include <sstream>
#include <string>
#include <vector>

#include "rtc_base/socket.h"
#include "rtc_base/socket_address.h"
#include "rtc_base/ssl_certificate.h"
#include "rtc_base/thread.h"
#include "test/gmock.h"
#include "test/gtest.h"

namespace rtc {
namespace {

constexpr bool kPermuteExtensions = true;

class MockAsyncSocket : public Socket {
 public:
  virtual ~MockAsyncSocket() = default;
  MOCK_METHOD(Socket*, Accept, (SocketAddress*), (override));
  MOCK_METHOD(SocketAddress, GetLocalAddress, (), (const, override));
  MOCK_METHOD(SocketAddress, GetRemoteAddress, (), (const, override));
  MOCK_METHOD(int, Bind, (const SocketAddress&), (override));
  MOCK_METHOD(int, Connect, (const SocketAddress&), (override));
  MOCK_METHOD(int, Send, (const void*, size_t), (override));
  MOCK_METHOD(int,
              SendTo,
              (const void*, size_t, const SocketAddress&),
              (override));
  MOCK_METHOD(int, Recv, (void*, size_t, int64_t*), (override));
  MOCK_METHOD(int,
              RecvFrom,
              (void*, size_t, SocketAddress*, int64_t*),
              (override));
  MOCK_METHOD(int, Listen, (int), (override));
  MOCK_METHOD(int, Close, (), (override));
  MOCK_METHOD(int, GetError, (), (const, override));
  MOCK_METHOD(void, SetError, (int), (override));
  MOCK_METHOD(ConnState, GetState, (), (const, override));
  MOCK_METHOD(int, GetOption, (Option, int*), (override));
  MOCK_METHOD(int, SetOption, (Option, int), (override));
};

class MockCertVerifier : public SSLCertificateVerifier {
 public:
  virtual ~MockCertVerifier() = default;
  MOCK_METHOD(bool, Verify, (const SSLCertificate&), (override));
};

}  // namespace

using ::testing::_;
using ::testing::Return;

TEST(OpenSSLAdapterTest, TestTransformAlpnProtocols) {
  EXPECT_EQ("", TransformAlpnProtocols(std::vector<std::string>()));

  // Protocols larger than 255 characters (whose size can't be fit in a byte),
  // can't be converted, and an empty string will be returned.
  std::string large_protocol(256, 'a');
  EXPECT_EQ("",
            TransformAlpnProtocols(std::vector<std::string>{large_protocol}));

  // One protocol test.
  std::vector<std::string> alpn_protos{"h2"};
  std::stringstream expected_response;
  expected_response << static_cast<char>(2) << "h2";
  EXPECT_EQ(expected_response.str(), TransformAlpnProtocols(alpn_protos));

  // Standard protocols test (h2,http/1.1).
  alpn_protos.push_back("http/1.1");
  expected_response << static_cast<char>(8) << "http/1.1";
  EXPECT_EQ(expected_response.str(), TransformAlpnProtocols(alpn_protos));
}

// Verifies that SSLStart works when OpenSSLAdapter is started in standalone
// mode.
TEST(OpenSSLAdapterTest, TestBeginSSLBeforeConnection) {
  rtc::AutoThread main_thread;
  Socket* async_socket = new MockAsyncSocket();
  OpenSSLAdapter adapter(async_socket);
  EXPECT_EQ(adapter.StartSSL("webrtc.org"), 0);
}

// Verifies that the adapter factory can create new adapters.
TEST(OpenSSLAdapterFactoryTest, CreateSingleOpenSSLAdapter) {
  rtc::AutoThread main_thread;
  OpenSSLAdapterFactory adapter_factory;
  Socket* async_socket = new MockAsyncSocket();
  auto simple_adapter = std::unique_ptr<OpenSSLAdapter>(
      adapter_factory.CreateAdapter(async_socket, kPermuteExtensions));
  EXPECT_NE(simple_adapter, nullptr);
}

// Verifies that setting a custom verifier still allows for adapters to be
// created.
TEST(OpenSSLAdapterFactoryTest, CreateWorksWithCustomVerifier) {
  rtc::AutoThread main_thread;
  MockCertVerifier* mock_verifier = new MockCertVerifier();
  EXPECT_CALL(*mock_verifier, Verify(_)).WillRepeatedly(Return(true));
  auto cert_verifier = std::unique_ptr<SSLCertificateVerifier>(mock_verifier);

  OpenSSLAdapterFactory adapter_factory;
  adapter_factory.SetCertVerifier(cert_verifier.get());
  Socket* async_socket = new MockAsyncSocket();
  auto simple_adapter = std::unique_ptr<OpenSSLAdapter>(
      adapter_factory.CreateAdapter(async_socket, kPermuteExtensions));
  EXPECT_NE(simple_adapter, nullptr);
}

}  // namespace rtc