// Copyright 2013 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 "quic/core/http/quic_spdy_client_stream.h"

#include <memory>
#include <string>
#include <utility>

#include "absl/strings/str_cat.h"
#include "quic/core/crypto/null_encrypter.h"
#include "quic/core/http/quic_spdy_client_session.h"
#include "quic/core/http/spdy_utils.h"
#include "quic/core/quic_simple_buffer_allocator.h"
#include "quic/core/quic_utils.h"
#include "quic/platform/api/quic_logging.h"
#include "quic/platform/api/quic_socket_address.h"
#include "quic/platform/api/quic_test.h"
#include "quic/test_tools/crypto_test_utils.h"
#include "quic/test_tools/quic_spdy_session_peer.h"
#include "quic/test_tools/quic_test_utils.h"

using spdy::SpdyHeaderBlock;
using testing::_;
using testing::StrictMock;

namespace quic {
namespace test {

namespace {

class MockQuicSpdyClientSession : public QuicSpdyClientSession {
 public:
  explicit MockQuicSpdyClientSession(
      const ParsedQuicVersionVector& supported_versions,
      QuicConnection* connection,
      QuicClientPushPromiseIndex* push_promise_index)
      : QuicSpdyClientSession(DefaultQuicConfig(),
                              supported_versions,
                              connection,
                              QuicServerId("example.com", 443, false),
                              &crypto_config_,
                              push_promise_index),
        crypto_config_(crypto_test_utils::ProofVerifierForTesting()) {}
  MockQuicSpdyClientSession(const MockQuicSpdyClientSession&) = delete;
  MockQuicSpdyClientSession& operator=(const MockQuicSpdyClientSession&) =
      delete;
  ~MockQuicSpdyClientSession() override = default;

  MOCK_METHOD(bool,
              WriteControlFrame,
              (const QuicFrame& frame, TransmissionType type),
              (override));

  using QuicSession::ActivateStream;

 private:
  QuicCryptoClientConfig crypto_config_;
};

class QuicSpdyClientStreamTest : public QuicTestWithParam<ParsedQuicVersion> {
 public:
  class StreamVisitor;

  QuicSpdyClientStreamTest()
      : connection_(
            new StrictMock<MockQuicConnection>(&helper_,
                                               &alarm_factory_,
                                               Perspective::IS_CLIENT,
                                               SupportedVersions(GetParam()))),
        session_(connection_->supported_versions(),
                 connection_,
                 &push_promise_index_),
        body_("hello world") {
    session_.Initialize();
    connection_->AdvanceTime(QuicTime::Delta::FromSeconds(1));
    connection_->SetEncrypter(
        ENCRYPTION_FORWARD_SECURE,
        std::make_unique<NullEncrypter>(connection_->perspective()));
    headers_[":status"] = "200";
    headers_["content-length"] = "11";

    auto stream = std::make_unique<QuicSpdyClientStream>(
        GetNthClientInitiatedBidirectionalStreamId(
            connection_->transport_version(), 0),
        &session_, BIDIRECTIONAL);
    stream_ = stream.get();
    session_.ActivateStream(std::move(stream));

    stream_visitor_ = std::make_unique<StreamVisitor>();
    stream_->set_visitor(stream_visitor_.get());
  }

  class StreamVisitor : public QuicSpdyClientStream::Visitor {
    void OnClose(QuicSpdyStream* stream) override {
      QUIC_DVLOG(1) << "stream " << stream->id();
    }
  };

  MockQuicConnectionHelper helper_;
  MockAlarmFactory alarm_factory_;
  StrictMock<MockQuicConnection>* connection_;
  QuicClientPushPromiseIndex push_promise_index_;

  MockQuicSpdyClientSession session_;
  QuicSpdyClientStream* stream_;
  std::unique_ptr<StreamVisitor> stream_visitor_;
  SpdyHeaderBlock headers_;
  std::string body_;
};

INSTANTIATE_TEST_SUITE_P(Tests,
                         QuicSpdyClientStreamTest,
                         ::testing::ValuesIn(AllSupportedVersions()),
                         ::testing::PrintToStringParamName());

TEST_P(QuicSpdyClientStreamTest, TestReceivingIllegalResponseStatusCode) {
  headers_[":status"] = "200 ok";

  EXPECT_CALL(session_, WriteControlFrame(_, _));
  EXPECT_CALL(*connection_,
              OnStreamReset(stream_->id(), QUIC_BAD_APPLICATION_PAYLOAD));
  auto headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  EXPECT_THAT(stream_->stream_error(),
              IsStreamError(QUIC_BAD_APPLICATION_PAYLOAD));
}

TEST_P(QuicSpdyClientStreamTest, InvalidResponseHeader) {
  SetQuicReloadableFlag(quic_verify_request_headers_2, true);
  SetQuicReloadableFlag(quic_act_upon_invalid_header, true);
  auto headers = AsHeaderList(std::vector<std::pair<std::string, std::string>>{
      {":status", "200"}, {":path", "/foo"}});
  EXPECT_CALL(*connection_,
              OnStreamReset(stream_->id(), QUIC_BAD_APPLICATION_PAYLOAD));
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  EXPECT_THAT(stream_->stream_error(),
              IsStreamError(QUIC_BAD_APPLICATION_PAYLOAD));
}

TEST_P(QuicSpdyClientStreamTest, MissingStatusCode) {
  SetQuicReloadableFlag(quic_verify_request_headers_2, true);
  SetQuicReloadableFlag(quic_act_upon_invalid_header, true);
  auto headers = AsHeaderList(
      std::vector<std::pair<std::string, std::string>>{{"key", "value"}});
  EXPECT_CALL(*connection_,
              OnStreamReset(stream_->id(), QUIC_BAD_APPLICATION_PAYLOAD));
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  EXPECT_THAT(stream_->stream_error(),
              IsStreamError(QUIC_BAD_APPLICATION_PAYLOAD));
}

TEST_P(QuicSpdyClientStreamTest, TestFraming) {
  auto headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  QuicBuffer header = HttpEncoder::SerializeDataFrameHeader(
      body_.length(), SimpleBufferAllocator::Get());
  std::string data = VersionUsesHttp3(connection_->transport_version())
                         ? absl::StrCat(header.AsStringView(), body_)
                         : body_;
  stream_->OnStreamFrame(
      QuicStreamFrame(stream_->id(), /*fin=*/false, /*offset=*/0, data));
  EXPECT_EQ("200", stream_->response_headers().find(":status")->second);
  EXPECT_EQ(200, stream_->response_code());
  EXPECT_EQ(body_, stream_->data());
}

TEST_P(QuicSpdyClientStreamTest, Test100ContinueBeforeSuccessful) {
  // First send 100 Continue.
  headers_[":status"] = "100";
  auto headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  EXPECT_EQ("100", stream_->preliminary_headers().find(":status")->second);
  EXPECT_EQ(0u, stream_->response_headers().size());
  EXPECT_EQ(100, stream_->response_code());
  EXPECT_EQ("", stream_->data());
  // Then send 200 OK.
  headers_[":status"] = "200";
  headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  QuicBuffer header = HttpEncoder::SerializeDataFrameHeader(
      body_.length(), SimpleBufferAllocator::Get());
  std::string data = VersionUsesHttp3(connection_->transport_version())
                         ? absl::StrCat(header.AsStringView(), body_)
                         : body_;
  stream_->OnStreamFrame(
      QuicStreamFrame(stream_->id(), /*fin=*/false, /*offset=*/0, data));
  // Make sure the 200 response got parsed correctly.
  EXPECT_EQ("200", stream_->response_headers().find(":status")->second);
  EXPECT_EQ(200, stream_->response_code());
  EXPECT_EQ(body_, stream_->data());
  // Make sure the 100 response is still available.
  EXPECT_EQ("100", stream_->preliminary_headers().find(":status")->second);
}

TEST_P(QuicSpdyClientStreamTest, TestUnknownInformationalBeforeSuccessful) {
  // First send 199, an unknown Informational (1XX).
  headers_[":status"] = "199";
  auto headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  EXPECT_EQ(0u, stream_->response_headers().size());
  EXPECT_EQ(199, stream_->response_code());
  EXPECT_EQ("", stream_->data());
  // Then send 200 OK.
  headers_[":status"] = "200";
  headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  QuicBuffer header = HttpEncoder::SerializeDataFrameHeader(
      body_.length(), SimpleBufferAllocator::Get());
  std::string data = VersionUsesHttp3(connection_->transport_version())
                         ? absl::StrCat(header.AsStringView(), body_)
                         : body_;
  stream_->OnStreamFrame(
      QuicStreamFrame(stream_->id(), /*fin=*/false, /*offset=*/0, data));
  // Make sure the 200 response got parsed correctly.
  EXPECT_EQ("200", stream_->response_headers().find(":status")->second);
  EXPECT_EQ(200, stream_->response_code());
  EXPECT_EQ(body_, stream_->data());
}

TEST_P(QuicSpdyClientStreamTest, TestReceiving101) {
  // 101 "Switching Protocols" is forbidden in HTTP/3 as per the
  // "HTTP Upgrade" section of draft-ietf-quic-http.
  headers_[":status"] = "101";
  EXPECT_CALL(session_, WriteControlFrame(_, _));
  EXPECT_CALL(*connection_,
              OnStreamReset(stream_->id(), QUIC_BAD_APPLICATION_PAYLOAD));
  auto headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  EXPECT_THAT(stream_->stream_error(),
              IsStreamError(QUIC_BAD_APPLICATION_PAYLOAD));
}

TEST_P(QuicSpdyClientStreamTest, TestFramingOnePacket) {
  auto headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  QuicBuffer header = HttpEncoder::SerializeDataFrameHeader(
      body_.length(), SimpleBufferAllocator::Get());
  std::string data = VersionUsesHttp3(connection_->transport_version())
                         ? absl::StrCat(header.AsStringView(), body_)
                         : body_;
  stream_->OnStreamFrame(
      QuicStreamFrame(stream_->id(), /*fin=*/false, /*offset=*/0, data));
  EXPECT_EQ("200", stream_->response_headers().find(":status")->second);
  EXPECT_EQ(200, stream_->response_code());
  EXPECT_EQ(body_, stream_->data());
}

TEST_P(QuicSpdyClientStreamTest,
       QUIC_TEST_DISABLED_IN_CHROME(TestFramingExtraData)) {
  std::string large_body = "hello world!!!!!!";

  auto headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);
  // The headers should parse successfully.
  EXPECT_THAT(stream_->stream_error(), IsQuicStreamNoError());
  EXPECT_EQ("200", stream_->response_headers().find(":status")->second);
  EXPECT_EQ(200, stream_->response_code());
  QuicBuffer header = HttpEncoder::SerializeDataFrameHeader(
      large_body.length(), SimpleBufferAllocator::Get());
  std::string data = VersionUsesHttp3(connection_->transport_version())
                         ? absl::StrCat(header.AsStringView(), large_body)
                         : large_body;
  EXPECT_CALL(session_, WriteControlFrame(_, _));
  EXPECT_CALL(*connection_,
              OnStreamReset(stream_->id(), QUIC_BAD_APPLICATION_PAYLOAD));

  stream_->OnStreamFrame(
      QuicStreamFrame(stream_->id(), /*fin=*/false, /*offset=*/0, data));

  EXPECT_NE(QUIC_STREAM_NO_ERROR, stream_->stream_error());
}

// Test that receiving trailing headers (on the headers stream), containing a
// final offset, results in the stream being closed at that byte offset.
TEST_P(QuicSpdyClientStreamTest, ReceivingTrailers) {
  // There is no kFinalOffsetHeaderKey if trailers are sent on the
  // request/response stream.
  if (VersionUsesHttp3(connection_->transport_version())) {
    return;
  }

  // Send headers as usual.
  auto headers = AsHeaderList(headers_);
  stream_->OnStreamHeaderList(false, headers.uncompressed_header_bytes(),
                              headers);

  // Send trailers before sending the body. Even though a FIN has been received
  // the stream should not be closed, as it does not yet have all the data bytes
  // promised by the final offset field.
  SpdyHeaderBlock trailer_block;
  trailer_block["trailer key"] = "trailer value";
  trailer_block[kFinalOffsetHeaderKey] = absl::StrCat(body_.size());
  auto trailers = AsHeaderList(trailer_block);
  stream_->OnStreamHeaderList(true, trailers.uncompressed_header_bytes(),
                              trailers);

  // Now send the body, which should close the stream as the FIN has been
  // received, as well as all data.
  QuicBuffer header = HttpEncoder::SerializeDataFrameHeader(
      body_.length(), SimpleBufferAllocator::Get());
  std::string data = VersionUsesHttp3(connection_->transport_version())
                         ? absl::StrCat(header.AsStringView(), body_)
                         : body_;
  stream_->OnStreamFrame(
      QuicStreamFrame(stream_->id(), /*fin=*/false, /*offset=*/0, data));
  EXPECT_TRUE(stream_->reading_stopped());
}

}  // namespace
}  // namespace test
}  // namespace quic