// Copyright (c) 2012 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/url_request/test_url_fetcher_factory.h"

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

#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/files/file_util.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/task/sequenced_task_runner.h"
#include "base/threading/sequenced_task_runner_handle.h"
#include "base/threading/thread_restrictions.h"
#include "net/base/completion_once_callback.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/base/upload_data_stream.h"
#include "net/http/http_response_headers.h"
#include "net/traffic_annotation/network_traffic_annotation_test_helper.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "net/url_request/url_fetcher_impl.h"
#include "net/url_request/url_fetcher_response_writer.h"

namespace net {

ScopedURLFetcherFactory::ScopedURLFetcherFactory(
    URLFetcherFactory* factory) {
  DCHECK(!URLFetcherImpl::factory());
  URLFetcherImpl::set_factory(factory);
}

ScopedURLFetcherFactory::~ScopedURLFetcherFactory() {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  DCHECK(URLFetcherImpl::factory());
  URLFetcherImpl::set_factory(nullptr);
}

TestURLFetcher::TestURLFetcher(int id, const GURL& url, URLFetcherDelegate* d)
    : id_(id),
      original_url_(url),
      delegate_(d),
      delegate_for_tests_(nullptr),
      did_receive_last_chunk_(false),
      fake_load_flags_(0),
      fake_response_code_(-1),
      fake_response_destination_(STRING),
      write_response_file_(false),
      fake_was_cached_(false),
      fake_response_bytes_(0),
      fake_max_retries_(0) {
  CHECK(original_url_.is_valid());
}

TestURLFetcher::~TestURLFetcher() {
  if (delegate_for_tests_)
    delegate_for_tests_->OnRequestEnd(id_);
}

void TestURLFetcher::SetUploadData(const std::string& upload_content_type,
                                   const std::string& upload_content) {
  upload_content_type_ = upload_content_type;
  upload_data_ = upload_content;
}

void TestURLFetcher::SetUploadFilePath(
    const std::string& upload_content_type,
    const base::FilePath& file_path,
    uint64_t range_offset,
    uint64_t range_length,
    scoped_refptr<base::TaskRunner> file_task_runner) {
  upload_file_path_ = file_path;
}

void TestURLFetcher::SetUploadStreamFactory(
    const std::string& upload_content_type,
    const CreateUploadStreamCallback& factory) {
}

void TestURLFetcher::SetChunkedUpload(const std::string& upload_content_type) {
}

void TestURLFetcher::AppendChunkToUpload(const std::string& data,
                                         bool is_last_chunk) {
  DCHECK(!did_receive_last_chunk_);
  did_receive_last_chunk_ = is_last_chunk;
  chunks_.push_back(data);
  if (delegate_for_tests_)
    delegate_for_tests_->OnChunkUpload(id_);
}

void TestURLFetcher::SetLoadFlags(int load_flags) {
  fake_load_flags_= load_flags;
}

int TestURLFetcher::GetLoadFlags() const {
  return fake_load_flags_;
}

void TestURLFetcher::SetReferrer(const std::string& referrer) {
}

void TestURLFetcher::SetReferrerPolicy(ReferrerPolicy referrer_policy) {}

void TestURLFetcher::ClearExtraRequestHeaders() {
  fake_extra_request_headers_.Clear();
}

void TestURLFetcher::AddExtraRequestHeader(const std::string& name,
                                           const std::string& value) {
  fake_extra_request_headers_.SetHeader(name, value);
}

void TestURLFetcher::SetRequestContext(
    URLRequestContextGetter* request_context_getter) {
}

void TestURLFetcher::SetInitiator(
    const absl::optional<url::Origin>& initiator) {}

void TestURLFetcher::SetURLRequestUserData(
    const void* key,
    const CreateDataCallback& create_data_callback) {
}

void TestURLFetcher::SetStopOnRedirect(bool stop_on_redirect) {
}

void TestURLFetcher::SetAutomaticallyRetryOn5xx(bool retry) {
}

void TestURLFetcher::SetMaxRetriesOn5xx(int max_retries) {
  fake_max_retries_ = max_retries;
}

int TestURLFetcher::GetMaxRetriesOn5xx() const {
  return fake_max_retries_;
}

base::TimeDelta TestURLFetcher::GetBackoffDelay() const {
  return base::TimeDelta();
}

void TestURLFetcher::SetAutomaticallyRetryOnNetworkChanges(int max_retries) {
}

void TestURLFetcher::SaveResponseToFileAtPath(
    const base::FilePath& file_path,
    scoped_refptr<base::SequencedTaskRunner> file_task_runner) {
  write_response_file_ = true;
  SetResponseFilePath(file_path);
  // Asynchronous IO is not supported, so file_task_runner is ignored.
}

void TestURLFetcher::SaveResponseToTemporaryFile(
    scoped_refptr<base::SequencedTaskRunner> file_task_runner) {
  base::FilePath path;
  if (!base::CreateTemporaryFile(&path))
    DLOG(ERROR) << "SaveResponseToTemporaryFile failed creating temp file";
  SaveResponseToFileAtPath(path, file_task_runner);
}

void TestURLFetcher::SaveResponseWithWriter(
    std::unique_ptr<URLFetcherResponseWriter> response_writer) {
  // In class URLFetcherCore this method is called by all three:
  // GetResponseAsString() / SaveResponseToFileAtPath() /
  // SaveResponseToTemporaryFile(). But here (in TestURLFetcher), this method
  // is never used by any of these three methods. So, file writing is expected
  // to be done in SaveResponseToFileAtPath(), and this method supports only
  // URLFetcherStringWriter (for testing of this method only).
  if (fake_response_destination_ == STRING) {
    response_writer_ = std::move(response_writer);
    int response = response_writer_->Initialize(CompletionOnceCallback());
    // The TestURLFetcher doesn't handle asynchronous writes.
    DCHECK_EQ(OK, response);

    scoped_refptr<IOBuffer> buffer =
        base::MakeRefCounted<StringIOBuffer>(fake_response_string_);
    response = response_writer_->Write(
        buffer.get(), fake_response_string_.size(), CompletionOnceCallback());
    DCHECK_EQ(static_cast<int>(fake_response_string_.size()), response);
    response = response_writer_->Finish(OK, CompletionOnceCallback());
    DCHECK_EQ(OK, response);
  } else if (fake_response_destination_ == TEMP_FILE) {
    // SaveResponseToFileAtPath() should be called instead of this method to
    // save file. Asynchronous file writing using URLFetcherFileWriter is not
    // supported.
    NOTIMPLEMENTED();
  } else {
    NOTREACHED();
  }
}

HttpResponseHeaders* TestURLFetcher::GetResponseHeaders() const {
  return fake_response_headers_.get();
}

IPEndPoint TestURLFetcher::GetSocketAddress() const {
  NOTIMPLEMENTED();
  return IPEndPoint();
}

const ProxyServer& TestURLFetcher::ProxyServerUsed() const {
  return fake_proxy_server_;
}

bool TestURLFetcher::WasCached() const {
  return fake_was_cached_;
}

int64_t TestURLFetcher::GetReceivedResponseContentLength() const {
  return fake_response_bytes_;
}

int64_t TestURLFetcher::GetTotalReceivedBytes() const {
  return fake_was_cached_ ? 0 : fake_response_bytes_;
}

void TestURLFetcher::Start() {
  // Overriden to do nothing. It is assumed the caller will notify the delegate.
  if (delegate_for_tests_)
    delegate_for_tests_->OnRequestStart(id_);

  // If the response should go into a file, write it out now.
  if (fake_error_ == net::OK && fake_response_code_ == net::HTTP_OK &&
      write_response_file_ && !fake_response_file_path_.empty()) {
    base::ScopedAllowBlockingForTesting allow_blocking;
    size_t written_bytes =
        base::WriteFile(fake_response_file_path_, fake_response_string_.c_str(),
                        fake_response_string_.size());
    DCHECK_EQ(fake_response_string_.size(), written_bytes);
  }
}

const GURL& TestURLFetcher::GetOriginalURL() const {
  return original_url_;
}

const GURL& TestURLFetcher::GetURL() const {
  return fake_url_;
}

Error TestURLFetcher::GetError() const {
  return fake_error_;
}

int TestURLFetcher::GetResponseCode() const {
  return fake_response_code_;
}

void TestURLFetcher::ReceivedContentWasMalformed() {
}

bool TestURLFetcher::GetResponseAsString(
    std::string* out_response_string) const {
  if (fake_response_destination_ != STRING)
    return false;

  *out_response_string = fake_response_string_;
  return true;
}

bool TestURLFetcher::GetResponseAsFilePath(
    bool take_ownership, base::FilePath* out_response_path) const {
  if (fake_response_destination_ != TEMP_FILE)
    return false;

  *out_response_path = fake_response_file_path_;
  return true;
}

void TestURLFetcher::GetExtraRequestHeaders(
    HttpRequestHeaders* headers) const {
  *headers = fake_extra_request_headers_;
}

void TestURLFetcher::set_was_cached(bool flag) {
  fake_was_cached_ = flag;
}

void TestURLFetcher::set_response_headers(
    scoped_refptr<HttpResponseHeaders> headers) {
  fake_response_headers_ = headers;
}

void TestURLFetcher::SetDelegateForTests(DelegateForTests* delegate_for_tests) {
  delegate_for_tests_ = delegate_for_tests;
}

void TestURLFetcher::SetResponseString(const std::string& response) {
  fake_response_destination_ = STRING;
  fake_response_string_ = response;
  fake_response_bytes_ = response.size();
}

void TestURLFetcher::SetResponseFilePath(const base::FilePath& path) {
  fake_response_destination_ = TEMP_FILE;
  fake_response_file_path_ = path;
}

FakeURLFetcher::FakeURLFetcher(const GURL& url,
                               URLFetcherDelegate* d,
                               const std::string& response_data,
                               HttpStatusCode response_code,
                               Error error)
    : TestURLFetcher(0, url, d) {
  set_error(error);
  set_response_code(response_code);
  SetResponseString(response_data);
  response_bytes_ = response_data.size();
}

FakeURLFetcher::~FakeURLFetcher() = default;

void FakeURLFetcher::Start() {
  TestURLFetcher::Start();
  base::SequencedTaskRunnerHandle::Get()->PostTask(
      FROM_HERE,
      base::BindOnce(&FakeURLFetcher::RunDelegate, weak_factory_.GetWeakPtr()));
}

void FakeURLFetcher::RunDelegate() {
  // OnURLFetchDownloadProgress may delete this URLFetcher. We keep track of
  // this with a weak pointer, and only call OnURLFetchComplete if this still
  // exists.
  auto weak_this = weak_factory_.GetWeakPtr();
  delegate()->OnURLFetchDownloadProgress(this, response_bytes_, response_bytes_,
                                         response_bytes_);
  if (weak_this.get())
    delegate()->OnURLFetchComplete(this);
}

const GURL& FakeURLFetcher::GetURL() const {
  return TestURLFetcher::GetOriginalURL();
}

FakeURLFetcherFactory::FakeURLFetcherFactory(URLFetcherFactory* default_factory)
    : ScopedURLFetcherFactory(this),
      creator_(base::BindRepeating(&DefaultFakeURLFetcherCreator)),
      default_factory_(default_factory) {}

FakeURLFetcherFactory::FakeURLFetcherFactory(
    URLFetcherFactory* default_factory,
    const FakeURLFetcherCreator& creator)
    : ScopedURLFetcherFactory(this),
      creator_(creator),
      default_factory_(default_factory) {
}

std::unique_ptr<FakeURLFetcher>
FakeURLFetcherFactory::DefaultFakeURLFetcherCreator(
    const GURL& url,
    URLFetcherDelegate* delegate,
    const std::string& response_data,
    HttpStatusCode response_code,
    Error error) {
  return std::make_unique<FakeURLFetcher>(url, delegate, response_data,
                                          response_code, error);
}

FakeURLFetcherFactory::~FakeURLFetcherFactory() = default;

std::unique_ptr<URLFetcher> FakeURLFetcherFactory::CreateURLFetcher(
    int id,
    const GURL& url,
    URLFetcher::RequestType request_type,
    URLFetcherDelegate* d,
    NetworkTrafficAnnotationTag traffic_annotation) {
  FakeResponseMap::const_iterator it = fake_responses_.find(url);
  if (it == fake_responses_.end()) {
    if (default_factory_ == nullptr) {
      // If we don't have a baked response for that URL we return NULL.
      DLOG(ERROR) << "No baked response for URL: " << url.spec();
      return nullptr;
    } else {
      return default_factory_->CreateURLFetcher(id, url, request_type, d,
                                                traffic_annotation);
    }
  }

  std::unique_ptr<URLFetcher> fake_fetcher =
      creator_.Run(url, d, it->second.response_data, it->second.response_code,
                   it->second.error);
  return fake_fetcher;
}

void FakeURLFetcherFactory::SetFakeResponse(const GURL& url,
                                            const std::string& response_data,
                                            HttpStatusCode response_code,
                                            Error error) {
  // Overwrite existing URL if it already exists.
  FakeURLResponse response;
  response.response_data = response_data;
  response.response_code = response_code;
  response.error = error;
  fake_responses_[url] = response;
}

void FakeURLFetcherFactory::ClearFakeResponses() {
  fake_responses_.clear();
}

}  // namespace net