// 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 "content/renderer/loader/web_url_loader_impl.h"

#include <stdint.h>

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

#include "base/bind.h"
#include "base/callback.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/optional.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "content/child/child_thread_impl.h"
#include "content/common/service_worker/service_worker_types.h"
#include "content/public/common/content_features.h"
#include "content/public/common/navigation_policy.h"
#include "content/public/common/previews_state.h"
#include "content/public/common/referrer.h"
#include "content/public/renderer/fixed_received_data.h"
#include "content/public/renderer/request_peer.h"
#include "content/renderer/loader/request_extra_data.h"
#include "content/renderer/loader/resource_dispatcher.h"
#include "content/renderer/loader/shared_memory_data_consumer_handle.h"
#include "content/renderer/loader/sync_load_response.h"
#include "content/renderer/loader/web_url_request_util.h"
#include "net/base/data_url.h"
#include "net/base/filename_util.h"
#include "net/base/load_flags.h"
#include "net/base/net_errors.h"
#include "net/cert/cert_status_flags.h"
#include "net/cert/ct_sct_to_string.h"
#include "net/cert/x509_certificate.h"
#include "net/cert/x509_util.h"
#include "net/http/http_response_headers.h"
#include "net/ssl/ssl_cipher_suite_names.h"
#include "net/ssl/ssl_connection_status_flags.h"
#include "net/ssl/ssl_info.h"
#include "net/url_request/url_request_data_job.h"
#include "services/network/loader_util.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/mojom/request_context_frame_type.mojom.h"
#include "services/network/public/mojom/url_loader.mojom.h"
#include "third_party/blink/public/common/mime_util/mime_util.h"
#include "third_party/blink/public/platform/file_path_conversion.h"
#include "third_party/blink/public/platform/interface_provider.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/web_http_load_info.h"
#include "third_party/blink/public/platform/web_security_origin.h"
#include "third_party/blink/public/platform/web_security_style.h"
#include "third_party/blink/public/platform/web_url.h"
#include "third_party/blink/public/platform/web_url_error.h"
#include "third_party/blink/public/platform/web_url_load_timing.h"
#include "third_party/blink/public/platform/web_url_loader_client.h"
#include "third_party/blink/public/platform/web_url_request.h"
#include "third_party/blink/public/platform/web_url_response.h"
#include "third_party/blink/public/web/web_security_policy.h"
#include "third_party/boringssl/src/include/openssl/ssl.h"

using base::Time;
using base::TimeTicks;
using blink::WebData;
using blink::WebHTTPBody;
using blink::WebHTTPHeaderVisitor;
using blink::WebHTTPLoadInfo;
using blink::WebSecurityPolicy;
using blink::WebString;
using blink::WebURL;
using blink::WebURLError;
using blink::WebURLLoadTiming;
using blink::WebURLLoader;
using blink::WebURLLoaderClient;
using blink::WebURLRequest;
using blink::WebURLResponse;
using blink::scheduler::WebResourceLoadingTaskRunnerHandle;

namespace content {

// Utilities ------------------------------------------------------------------

namespace {

constexpr char kStylesheetAcceptHeader[] = "text/css,*/*;q=0.1";
constexpr char kImageAcceptHeader[] = "image/webp,image/apng,image/*,*/*;q=0.8";

using HeadersVector = network::HttpRawRequestResponseInfo::HeadersVector;

// TODO(estark): Figure out a way for the embedder to provide the
// security style for a resource. Ideally, the logic for assigning
// per-resource security styles should live in the same place as the
// logic for assigning per-page security styles (which lives in the
// embedder). It would also be nice for the embedder to have the chance
// to control the per-resource security style beyond the simple logic
// here. (For example, the embedder might want to mark certain resources
// differently if they use SHA1 signatures.) https://crbug.com/648326
blink::WebSecurityStyle GetSecurityStyleForResource(
    const GURL& url,
    net::CertStatus cert_status) {
  if (!url.SchemeIsCryptographic())
    return blink::kWebSecurityStyleNeutral;

  // Minor errors don't lower the security style to
  // WebSecurityStyleAuthenticationBroken.
  if (net::IsCertStatusError(cert_status) &&
      !net::IsCertStatusMinorError(cert_status)) {
    return blink::kWebSecurityStyleInsecure;
  }

  return blink::kWebSecurityStyleSecure;
}

// Converts timing data from |load_timing| to the format used by WebKit.
void PopulateURLLoadTiming(const net::LoadTimingInfo& load_timing,
                           WebURLLoadTiming* url_timing) {
  DCHECK(!load_timing.request_start.is_null());

  url_timing->Initialize();
  url_timing->SetRequestTime(load_timing.request_start);
  url_timing->SetProxyStart(load_timing.proxy_resolve_start);
  url_timing->SetProxyEnd(load_timing.proxy_resolve_end);
  url_timing->SetDNSStart(load_timing.connect_timing.dns_start);
  url_timing->SetDNSEnd(load_timing.connect_timing.dns_end);
  url_timing->SetConnectStart(load_timing.connect_timing.connect_start);
  url_timing->SetConnectEnd(load_timing.connect_timing.connect_end);
  url_timing->SetSSLStart(load_timing.connect_timing.ssl_start);
  url_timing->SetSSLEnd(load_timing.connect_timing.ssl_end);
  url_timing->SetSendStart(load_timing.send_start);
  url_timing->SetSendEnd(load_timing.send_end);
  url_timing->SetReceiveHeadersStart(load_timing.receive_headers_start);
  url_timing->SetReceiveHeadersEnd(load_timing.receive_headers_end);
  url_timing->SetPushStart(load_timing.push_start);
  url_timing->SetPushEnd(load_timing.push_end);
}

// This is complementary to ConvertNetPriorityToWebKitPriority, defined in
// service_worker_context_client.cc.
net::RequestPriority ConvertWebKitPriorityToNetPriority(
    const WebURLRequest::Priority& priority) {
  switch (priority) {
    case WebURLRequest::Priority::kVeryHigh:
      return net::HIGHEST;

    case WebURLRequest::Priority::kHigh:
      return net::MEDIUM;

    case WebURLRequest::Priority::kMedium:
      return net::LOW;

    case WebURLRequest::Priority::kLow:
      return net::LOWEST;

    case WebURLRequest::Priority::kVeryLow:
      return net::IDLE;

    case WebURLRequest::Priority::kUnresolved:
    default:
      NOTREACHED();
      return net::LOW;
  }
}

// Extracts info from a data scheme URL |url| into |info| and |data|. Returns
// net::OK if successful. Returns a net error code otherwise.
int GetInfoFromDataURL(const GURL& url,
                       network::ResourceResponseInfo* info,
                       std::string* data) {
  // Assure same time for all time fields of data: URLs.
  Time now = Time::Now();
  info->load_timing.request_start = TimeTicks::Now();
  info->load_timing.request_start_time = now;
  info->request_time = now;
  info->response_time = now;

  std::string mime_type;
  std::string charset;
  scoped_refptr<net::HttpResponseHeaders> headers(
      new net::HttpResponseHeaders(std::string()));
  int result = net::URLRequestDataJob::BuildResponse(
      url, &mime_type, &charset, data, headers.get());
  if (result != net::OK)
    return result;

  info->headers = headers;
  info->mime_type.swap(mime_type);
  info->charset.swap(charset);
  info->content_length = data->length();
  info->encoded_data_length = 0;
  info->encoded_body_length = 0;

  return net::OK;
}

// Convert a net::SignedCertificateTimestampAndStatus object to a
// blink::WebURLResponse::SignedCertificateTimestamp object.
blink::WebURLResponse::SignedCertificateTimestamp NetSCTToBlinkSCT(
    const net::SignedCertificateTimestampAndStatus& sct_and_status) {
  return blink::WebURLResponse::SignedCertificateTimestamp(
      WebString::FromASCII(net::ct::StatusToString(sct_and_status.status)),
      WebString::FromASCII(net::ct::OriginToString(sct_and_status.sct->origin)),
      WebString::FromUTF8(sct_and_status.sct->log_description),
      WebString::FromASCII(
          base::HexEncode(sct_and_status.sct->log_id.c_str(),
                          sct_and_status.sct->log_id.length())),
      sct_and_status.sct->timestamp.ToJavaTime(),
      WebString::FromASCII(net::ct::HashAlgorithmToString(
          sct_and_status.sct->signature.hash_algorithm)),
      WebString::FromASCII(net::ct::SignatureAlgorithmToString(
          sct_and_status.sct->signature.signature_algorithm)),
      WebString::FromASCII(base::HexEncode(
          sct_and_status.sct->signature.signature_data.c_str(),
          sct_and_status.sct->signature.signature_data.length())));
}

WebString CryptoBufferAsWebString(const CRYPTO_BUFFER* buffer) {
  base::StringPiece sp = net::x509_util::CryptoBufferAsStringPiece(buffer);
  return blink::WebString::FromLatin1(
      reinterpret_cast<const blink::WebLChar*>(sp.begin()), sp.size());
}

void SetSecurityStyleAndDetails(const GURL& url,
                                const network::ResourceResponseInfo& info,
                                WebURLResponse* response,
                                bool report_security_info) {
  if (!report_security_info) {
    response->SetSecurityStyle(blink::kWebSecurityStyleUnknown);
    return;
  }
  if (!url.SchemeIsCryptographic()) {
    response->SetSecurityStyle(blink::kWebSecurityStyleNeutral);
    return;
  }

  // The resource loader does not provide a guarantee that requests always have
  // security info (such as a certificate) attached. Use WebSecurityStyleUnknown
  // in this case where there isn't enough information to be useful.
  if (!info.ssl_info.has_value()) {
    response->SetSecurityStyle(blink::kWebSecurityStyleUnknown);
    return;
  }

  const net::SSLInfo& ssl_info = *info.ssl_info;

  const char* protocol = "";
  const char* key_exchange = "";
  const char* cipher = "";
  const char* mac = "";
  const char* key_exchange_group = "";

  if (ssl_info.connection_status) {
    int ssl_version =
        net::SSLConnectionStatusToVersion(ssl_info.connection_status);
    net::SSLVersionToString(&protocol, ssl_version);

    bool is_aead;
    bool is_tls13;
    uint16_t cipher_suite =
        net::SSLConnectionStatusToCipherSuite(ssl_info.connection_status);
    net::SSLCipherSuiteToStrings(&key_exchange, &cipher, &mac, &is_aead,
                                 &is_tls13, cipher_suite);
    if (key_exchange == nullptr) {
      DCHECK(is_tls13);
      key_exchange = "";
    }

    if (mac == nullptr) {
      DCHECK(is_aead);
      mac = "";
    }

    if (ssl_info.key_exchange_group != 0) {
      // Historically the field was named 'curve' rather than 'group'.
      key_exchange_group = SSL_get_curve_name(ssl_info.key_exchange_group);
      if (!key_exchange_group) {
        NOTREACHED();
        key_exchange_group = "";
      }
    }
  }

  response->SetSecurityStyle(
      GetSecurityStyleForResource(url, info.cert_status));

  blink::WebURLResponse::SignedCertificateTimestampList sct_list(
      ssl_info.signed_certificate_timestamps.size());

  for (size_t i = 0; i < sct_list.size(); ++i)
    sct_list[i] = NetSCTToBlinkSCT(ssl_info.signed_certificate_timestamps[i]);

  if (!ssl_info.cert) {
    NOTREACHED();
    response->SetSecurityStyle(blink::kWebSecurityStyleUnknown);
    return;
  }

  std::vector<std::string> san_dns;
  std::vector<std::string> san_ip;
  ssl_info.cert->GetSubjectAltName(&san_dns, &san_ip);
  blink::WebVector<blink::WebString> web_san(san_dns.size() + san_ip.size());
  std::transform(
      san_dns.begin(), san_dns.end(), web_san.begin(),
      [](const std::string& h) { return blink::WebString::FromLatin1(h); });
  std::transform(san_ip.begin(), san_ip.end(), web_san.begin() + san_dns.size(),
                 [](const std::string& h) {
                   net::IPAddress ip(reinterpret_cast<const uint8_t*>(h.data()),
                                     h.size());
                   return blink::WebString::FromLatin1(ip.ToString());
                 });

  blink::WebVector<blink::WebString> web_cert;
  web_cert.reserve(ssl_info.cert->intermediate_buffers().size() + 1);
  web_cert.emplace_back(CryptoBufferAsWebString(ssl_info.cert->cert_buffer()));
  for (const auto& cert : ssl_info.cert->intermediate_buffers())
    web_cert.emplace_back(CryptoBufferAsWebString(cert.get()));

  blink::WebURLResponse::WebSecurityDetails webSecurityDetails(
      WebString::FromASCII(protocol), WebString::FromASCII(key_exchange),
      WebString::FromASCII(key_exchange_group), WebString::FromASCII(cipher),
      WebString::FromASCII(mac),
      WebString::FromUTF8(ssl_info.cert->subject().common_name), web_san,
      WebString::FromUTF8(ssl_info.cert->issuer().common_name),
      ssl_info.cert->valid_start().ToDoubleT(),
      ssl_info.cert->valid_expiry().ToDoubleT(), web_cert, sct_list);

  response->SetSecurityDetails(webSecurityDetails);
}

}  // namespace

WebURLLoaderFactoryImpl::WebURLLoaderFactoryImpl(
    base::WeakPtr<ResourceDispatcher> resource_dispatcher,
    scoped_refptr<network::SharedURLLoaderFactory> loader_factory)
    : resource_dispatcher_(std::move(resource_dispatcher)),
      loader_factory_(std::move(loader_factory)) {}

WebURLLoaderFactoryImpl::~WebURLLoaderFactoryImpl() = default;

std::unique_ptr<WebURLLoaderFactoryImpl>
WebURLLoaderFactoryImpl::CreateTestOnlyFactory() {
  return std::make_unique<WebURLLoaderFactoryImpl>(nullptr, nullptr);
}

std::unique_ptr<blink::WebURLLoader> WebURLLoaderFactoryImpl::CreateURLLoader(
    const blink::WebURLRequest& request,
    std::unique_ptr<WebResourceLoadingTaskRunnerHandle> task_runner_handle) {
  if (!loader_factory_) {
    // In some tests like RenderViewTests loader_factory_ is not available.
    // These tests can still use data URLs to bypass the ResourceDispatcher.
    if (!task_runner_handle) {
      // TODO(altimin): base::ThreadTaskRunnerHandle::Get is deprecated in
      // the renderer. Fix this for frame and non-frame clients.
      task_runner_handle =
          WebResourceLoadingTaskRunnerHandle::CreateUnprioritized(
              base::ThreadTaskRunnerHandle::Get());
    }

    return std::make_unique<WebURLLoaderImpl>(resource_dispatcher_.get(),
                                              std::move(task_runner_handle),
                                              nullptr /* factory */);
  }

  DCHECK(task_runner_handle);
  DCHECK(resource_dispatcher_);
  return std::make_unique<WebURLLoaderImpl>(resource_dispatcher_.get(),
                                            std::move(task_runner_handle),
                                            loader_factory_);
}

// This inner class exists since the WebURLLoader may be deleted while inside a
// call to WebURLLoaderClient.  Refcounting is to keep the context from being
// deleted if it may have work to do after calling into the client.
class WebURLLoaderImpl::Context : public base::RefCounted<Context> {
 public:
  using ReceivedData = RequestPeer::ReceivedData;

  Context(
      WebURLLoaderImpl* loader,
      ResourceDispatcher* resource_dispatcher,
      std::unique_ptr<WebResourceLoadingTaskRunnerHandle> task_runner_handle,
      scoped_refptr<network::SharedURLLoaderFactory> factory,
      mojom::KeepAliveHandlePtr keep_alive_handle);

  ResourceDispatcher* resource_dispatcher() { return resource_dispatcher_; }
  int request_id() const { return request_id_; }
  WebURLLoaderClient* client() const { return client_; }
  void set_client(WebURLLoaderClient* client) { client_ = client; }
  scoped_refptr<base::SingleThreadTaskRunner> task_runner() {
    return task_runner_;
  }

  void Cancel();
  void SetDefersLoading(bool value);
  void DidChangePriority(WebURLRequest::Priority new_priority,
                         int intra_priority_value);
  void Start(const WebURLRequest& request,
             SyncLoadResponse* sync_load_response);

  void OnUploadProgress(uint64_t position, uint64_t size);
  bool OnReceivedRedirect(const net::RedirectInfo& redirect_info,
                          const network::ResourceResponseInfo& info);
  void OnReceivedResponse(const network::ResourceResponseInfo& info);
  void OnStartLoadingResponseBody(mojo::ScopedDataPipeConsumerHandle body);
  void OnReceivedData(std::unique_ptr<ReceivedData> data);
  void OnTransferSizeUpdated(int transfer_size_diff);
  void OnReceivedCachedMetadata(const char* data, int len);
  void OnCompletedRequest(const network::URLLoaderCompletionStatus& status);

 private:
  friend class base::RefCounted<Context>;
  ~Context();

  // Called when the body data stream is detached from the reader side.
  void CancelBodyStreaming();
  // We can optimize the handling of data URLs in most cases.
  bool CanHandleDataURLRequestLocally(const WebURLRequest& request) const;
  void HandleDataURL();

  static net::NetworkTrafficAnnotationTag GetTrafficAnnotationTag(
      const blink::WebURLRequest& request);

  WebURLLoaderImpl* loader_;

  WebURL url_;
  bool use_stream_on_response_;
  // Controls SetSecurityStyleAndDetails() in PopulateURLResponse(). Initially
  // set to WebURLRequest::ReportRawHeaders() in Start() and gets updated in
  // WillFollowRedirect() (by the InspectorNetworkAgent) while the new
  // ReportRawHeaders() value won't be propagated to the browser process.
  //
  // TODO(tyoshino): Investigate whether it's worth propagating the new value.
  bool report_raw_headers_;

  WebURLLoaderClient* client_;
  ResourceDispatcher* resource_dispatcher_;
  std::unique_ptr<WebResourceLoadingTaskRunnerHandle> task_runner_handle_;
  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  std::unique_ptr<SharedMemoryDataConsumerHandle::Writer> body_stream_writer_;
  mojom::KeepAliveHandlePtr keep_alive_handle_;
  enum DeferState {NOT_DEFERRING, SHOULD_DEFER, DEFERRED_DATA};
  DeferState defers_loading_;
  int request_id_;

  scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory_;
};

// A thin wrapper class for Context to ensure its lifetime while it is
// handling IPC messages coming from ResourceDispatcher. Owns one ref to
// Context and held by ResourceDispatcher.
class WebURLLoaderImpl::RequestPeerImpl : public RequestPeer {
 public:
  // If |discard_body| is false this doesn't propagate the received data
  // to the context.
  explicit RequestPeerImpl(Context* context, bool discard_body = false);

  // RequestPeer methods:
  void OnUploadProgress(uint64_t position, uint64_t size) override;
  bool OnReceivedRedirect(const net::RedirectInfo& redirect_info,
                          const network::ResourceResponseInfo& info) override;
  void OnReceivedResponse(const network::ResourceResponseInfo& info) override;
  void OnStartLoadingResponseBody(
      mojo::ScopedDataPipeConsumerHandle body) override;
  void OnReceivedData(std::unique_ptr<ReceivedData> data) override;
  void OnTransferSizeUpdated(int transfer_size_diff) override;
  void OnReceivedCachedMetadata(const char* data, int len) override;
  void OnCompletedRequest(
      const network::URLLoaderCompletionStatus& status) override;
  scoped_refptr<base::TaskRunner> GetTaskRunner() override {
    return context_->task_runner();
  }

 private:
  scoped_refptr<Context> context_;
  const bool discard_body_;
  DISALLOW_COPY_AND_ASSIGN(RequestPeerImpl);
};

// A sink peer that doesn't forward the data.
class WebURLLoaderImpl::SinkPeer : public RequestPeer {
 public:
  explicit SinkPeer(Context* context) : context_(context) {}

  // RequestPeer implementation:
  void OnUploadProgress(uint64_t position, uint64_t size) override {}
  bool OnReceivedRedirect(const net::RedirectInfo& redirect_info,
                          const network::ResourceResponseInfo& info) override {
    return true;
  }
  void OnReceivedResponse(const network::ResourceResponseInfo& info) override {}
  void OnStartLoadingResponseBody(
      mojo::ScopedDataPipeConsumerHandle body) override {}
  void OnReceivedData(std::unique_ptr<ReceivedData> data) override {}
  void OnTransferSizeUpdated(int transfer_size_diff) override {}
  void OnReceivedCachedMetadata(const char* data, int len) override {}
  void OnCompletedRequest(
      const network::URLLoaderCompletionStatus& status) override {
    context_->resource_dispatcher()->Cancel(context_->request_id(),
                                            context_->task_runner());
  }
  scoped_refptr<base::TaskRunner> GetTaskRunner() override {
    return context_->task_runner();
  }

 private:
  scoped_refptr<Context> context_;
  DISALLOW_COPY_AND_ASSIGN(SinkPeer);
};

// WebURLLoaderImpl::Context --------------------------------------------------

WebURLLoaderImpl::Context::Context(
    WebURLLoaderImpl* loader,
    ResourceDispatcher* resource_dispatcher,
    std::unique_ptr<WebResourceLoadingTaskRunnerHandle> task_runner_handle,
    scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
    mojom::KeepAliveHandlePtr keep_alive_handle_ptr)
    : loader_(loader),
      use_stream_on_response_(false),
      report_raw_headers_(false),
      client_(nullptr),
      resource_dispatcher_(resource_dispatcher),
      task_runner_handle_(std::move(task_runner_handle)),
      task_runner_(task_runner_handle_->GetTaskRunner()),
      keep_alive_handle_(std::move(keep_alive_handle_ptr)),
      defers_loading_(NOT_DEFERRING),
      request_id_(-1),
      url_loader_factory_(std::move(url_loader_factory)) {
  DCHECK(url_loader_factory_ || !resource_dispatcher);
}

void WebURLLoaderImpl::Context::Cancel() {
  TRACE_EVENT_WITH_FLOW0("loading", "WebURLLoaderImpl::Context::Cancel", this,
                         TRACE_EVENT_FLAG_FLOW_IN);
  if (resource_dispatcher_ && // NULL in unittest.
      request_id_ != -1) {
    resource_dispatcher_->Cancel(request_id_, task_runner_);
    request_id_ = -1;
  }

  if (body_stream_writer_)
    body_stream_writer_->Fail();

  // Do not make any further calls to the client.
  client_ = nullptr;
  loader_ = nullptr;
}

void WebURLLoaderImpl::Context::SetDefersLoading(bool value) {
  if (request_id_ != -1)
    resource_dispatcher_->SetDefersLoading(request_id_, value);
  if (value && defers_loading_ == NOT_DEFERRING) {
    defers_loading_ = SHOULD_DEFER;
  } else if (!value && defers_loading_ != NOT_DEFERRING) {
    if (defers_loading_ == DEFERRED_DATA) {
      task_runner_->PostTask(FROM_HERE,
                             base::BindOnce(&Context::HandleDataURL, this));
    }
    defers_loading_ = NOT_DEFERRING;
  }
}

void WebURLLoaderImpl::Context::DidChangePriority(
    WebURLRequest::Priority new_priority, int intra_priority_value) {
  if (request_id_ != -1) {
    net::RequestPriority net_priority =
        ConvertWebKitPriorityToNetPriority(new_priority);
    resource_dispatcher_->DidChangePriority(request_id_, net_priority,
                                            intra_priority_value);
    task_runner_handle_->DidChangeRequestPriority(net_priority);
  }
}

void WebURLLoaderImpl::Context::Start(const WebURLRequest& request,
                                      SyncLoadResponse* sync_load_response) {
  DCHECK(request_id_ == -1);

  // Notify Blink's scheduler with the initial resource fetch priority.
  task_runner_handle_->DidChangeRequestPriority(
      ConvertWebKitPriorityToNetPriority(request.GetPriority()));

  url_ = request.Url();
  use_stream_on_response_ = request.UseStreamOnResponse();
  report_raw_headers_ = request.ReportRawHeaders();

  if (CanHandleDataURLRequestLocally(request)) {
    if (sync_load_response) {
      // This is a sync load. Do the work now.
      sync_load_response->url = url_;
      sync_load_response->error_code =
          GetInfoFromDataURL(sync_load_response->url, &sync_load_response->info,
                             &sync_load_response->data);
    } else {
      task_runner_->PostTask(FROM_HERE,
                             base::BindOnce(&Context::HandleDataURL, this));
    }
    return;
  }

  std::unique_ptr<NavigationResponseOverrideParameters> response_override;
  if (request.GetExtraData()) {
    RequestExtraData* extra_data =
        static_cast<RequestExtraData*>(request.GetExtraData());
    response_override = extra_data->TakeNavigationResponseOverrideOwnership();
  }


  // PlzNavigate: outside of tests, the only navigation requests going through
  // the WebURLLoader are the ones created by CommitNavigation. Several browser
  // tests load HTML directly through a data url which will be handled by the
  // block above.
  DCHECK(response_override ||
         request.GetFrameType() ==
             network::mojom::RequestContextFrameType::kNone);

  // TODO(domfarolino): Retrieve the referrer in the form of a referrer member
  // instead of the header field. See https://crbug.com/850813.
  GURL referrer_url(
      request.HttpHeaderField(WebString::FromASCII("Referer")).Latin1());
  const std::string& method = request.HttpMethod().Latin1();

  // TODO(brettw) this should take parameter encoding into account when
  // creating the GURLs.

  // TODO(horo): Check credentials flag is unset when credentials mode is omit.
  //             Check credentials flag is set when credentials mode is include.

  std::unique_ptr<network::ResourceRequest> resource_request(
      new network::ResourceRequest);

  resource_request->method = method;
  resource_request->url = url_;
  resource_request->site_for_cookies = request.SiteForCookies();
  resource_request->top_frame_origin = request.TopFrameOrigin();
  resource_request->upgrade_if_insecure = request.UpgradeIfInsecure();
  resource_request->is_revalidating = request.IsRevalidating();
  if (!request.RequestorOrigin().IsNull()) {
    if (request.RequestorOrigin().ToString() == "null") {
      // "file:" origin is treated like an opaque unique origin when
      // allow-file-access-from-files is not specified. Such origin is not
      // opaque (i.e., IsOpaque() returns false) but still serializes to
      // "null".
      resource_request->request_initiator = url::Origin();
    } else {
      resource_request->request_initiator = request.RequestorOrigin();
    }
  }
  resource_request->referrer = referrer_url;

  resource_request->referrer_policy =
      Referrer::ReferrerPolicyForUrlRequest(request.GetReferrerPolicy());
  resource_request->resource_type = WebURLRequestToResourceType(request);

  resource_request->headers = GetWebURLRequestHeaders(request);
  if (resource_request->resource_type == RESOURCE_TYPE_STYLESHEET) {
    resource_request->headers.SetHeader(network::kAcceptHeader,
                                        kStylesheetAcceptHeader);
  } else if (resource_request->resource_type == RESOURCE_TYPE_FAVICON ||
             resource_request->resource_type == RESOURCE_TYPE_IMAGE) {
    resource_request->headers.SetHeader(network::kAcceptHeader,
                                        kImageAcceptHeader);
  } else {
    // Calling SetHeaderIfMissing() instead of SetHeader() because JS can
    // manually set an accept header on an XHR.
    resource_request->headers.SetHeaderIfMissing(network::kAcceptHeader,
                                                 network::kDefaultAcceptHeader);
  }
  resource_request->requested_with_header =
      WebString(request.GetRequestedWithHeader()).Utf8();
  resource_request->client_data_header =
      WebString(request.GetClientDataHeader()).Utf8();

  if (resource_request->resource_type == RESOURCE_TYPE_PREFETCH ||
      resource_request->resource_type == RESOURCE_TYPE_FAVICON) {
    resource_request->do_not_prompt_for_login = true;
  }

  resource_request->load_flags = GetLoadFlagsForWebURLRequest(request);

  // |plugin_child_id| only needs to be non-zero if the request originates
  // outside the render process, so we can use requestorProcessID even
  // for requests from in-process plugins.
  resource_request->plugin_child_id = request.GetPluginChildID();
  resource_request->priority =
      ConvertWebKitPriorityToNetPriority(request.GetPriority());
  resource_request->appcache_host_id = request.AppCacheHostID();
  resource_request->should_reset_appcache = request.ShouldResetAppCache();
  resource_request->is_external_request = request.IsExternalRequest();
  resource_request->cors_preflight_policy = request.GetCorsPreflightPolicy();
  resource_request->skip_service_worker = request.GetSkipServiceWorker();
  resource_request->fetch_request_mode = request.GetFetchRequestMode();
  resource_request->fetch_credentials_mode = request.GetFetchCredentialsMode();
  resource_request->fetch_redirect_mode = request.GetFetchRedirectMode();
  resource_request->fetch_integrity =
      GetFetchIntegrityForWebURLRequest(request);
  resource_request->fetch_request_context_type =
      static_cast<int>(GetRequestContextTypeForWebURLRequest(request));

  resource_request->fetch_frame_type = request.GetFrameType();
  resource_request->request_body =
      GetRequestBodyForWebURLRequest(request).get();
  resource_request->keepalive = request.GetKeepalive();
  resource_request->has_user_gesture = request.HasUserGesture();
  resource_request->enable_load_timing = true;
  resource_request->enable_upload_progress = request.ReportUploadProgress();
  GURL gurl(url_);
  if (request.GetRequestContext() ==
          blink::mojom::RequestContextType::XML_HTTP_REQUEST &&
      (gurl.has_username() || gurl.has_password())) {
    resource_request->do_not_prompt_for_login = true;
  }
  resource_request->report_raw_headers = request.ReportRawHeaders();
  // TODO(ryansturm): Remove resource_request->previews_state once it is no
  // longer used in a network delegate. https://crbug.com/842233
  resource_request->previews_state =
      static_cast<int>(request.GetPreviewsState());
  resource_request->throttling_profile_id = request.GetDevToolsToken();

  if (base::UnguessableToken window_id = request.GetFetchWindowId())
    resource_request->fetch_window_id = base::make_optional(window_id);

  // The network request has already been made by the browser. The renderer
  // should bind the URLLoaderClientEndpoints stored in |response_override| to
  // an implementation of a URLLoaderClient to get the response body.
  if (response_override) {
    DCHECK(!sync_load_response);
  }

  RequestExtraData empty_extra_data;
  RequestExtraData* extra_data;
  if (request.GetExtraData())
    extra_data = static_cast<RequestExtraData*>(request.GetExtraData());
  else
    extra_data = &empty_extra_data;
  extra_data->CopyToResourceRequest(resource_request.get());

  std::unique_ptr<RequestPeer> peer;
  if (request.IsDownloadToNetworkCacheOnly()) {
    peer = std::make_unique<SinkPeer>(this);
  } else {
    const bool discard_body =
        (resource_request->resource_type == RESOURCE_TYPE_PREFETCH);
    peer =
        std::make_unique<WebURLLoaderImpl::RequestPeerImpl>(this, discard_body);
  }

  auto throttles = extra_data->TakeURLLoaderThrottles();
  // The frame request blocker is only for a frame's subresources.
  if (extra_data->frame_request_blocker() &&
      !IsResourceTypeFrame(
          static_cast<ResourceType>(resource_request->resource_type))) {
    auto throttle =
        extra_data->frame_request_blocker()->GetThrottleIfRequestsBlocked();
    if (throttle)
      throttles.push_back(std::move(throttle));
  }

  if (sync_load_response) {
    DCHECK(defers_loading_ == NOT_DEFERRING);

    blink::mojom::BlobRegistryPtrInfo download_to_blob_registry;
    if (request.PassResponsePipeToClient()) {
      blink::Platform::Current()->GetInterfaceProvider()->GetInterface(
          MakeRequest(&download_to_blob_registry));
    }
    resource_dispatcher_->StartSync(
        std::move(resource_request), request.RequestorID(),
        GetTrafficAnnotationTag(request), sync_load_response,
        url_loader_factory_, std::move(throttles), request.TimeoutInterval(),
        std::move(download_to_blob_registry), std::move(peer));
    return;
  }

  TRACE_EVENT_WITH_FLOW0("loading", "WebURLLoaderImpl::Context::Start", this,
                         TRACE_EVENT_FLAG_FLOW_OUT);
  base::OnceClosure continue_navigation_function;
  request_id_ = resource_dispatcher_->StartAsync(
      std::move(resource_request), request.RequestorID(), task_runner_,
      GetTrafficAnnotationTag(request), false /* is_sync */,
      request.PassResponsePipeToClient(), std::move(peer), url_loader_factory_,
      std::move(throttles), std::move(response_override),
      &continue_navigation_function);
  if (client_) {
    client_->SetContinueNavigationRequestCallback(
        std::move(continue_navigation_function));
  }

  if (defers_loading_ != NOT_DEFERRING)
    resource_dispatcher_->SetDefersLoading(request_id_, true);
}

void WebURLLoaderImpl::Context::OnUploadProgress(uint64_t position,
                                                 uint64_t size) {
  if (client_)
    client_->DidSendData(position, size);
}

bool WebURLLoaderImpl::Context::OnReceivedRedirect(
    const net::RedirectInfo& redirect_info,
    const network::ResourceResponseInfo& info) {
  if (!client_)
    return false;

  TRACE_EVENT_WITH_FLOW0(
      "loading", "WebURLLoaderImpl::Context::OnReceivedRedirect",
      this, TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT);

  WebURLResponse response;
  PopulateURLResponse(url_, info, &response, report_raw_headers_, request_id_);

  url_ = WebURL(redirect_info.new_url);
  return client_->WillFollowRedirect(
      url_, redirect_info.new_site_for_cookies,
      redirect_info.new_top_frame_origin,
      WebString::FromUTF8(redirect_info.new_referrer),
      Referrer::NetReferrerPolicyToBlinkReferrerPolicy(
          redirect_info.new_referrer_policy),
      WebString::FromUTF8(redirect_info.new_method), response,
      report_raw_headers_);
}

void WebURLLoaderImpl::Context::OnReceivedResponse(
    const network::ResourceResponseInfo& info) {
  if (!client_)
    return;

  TRACE_EVENT_WITH_FLOW0(
      "loading", "WebURLLoaderImpl::Context::OnReceivedResponse",
      this, TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT);

  WebURLResponse response;
  PopulateURLResponse(url_, info, &response, report_raw_headers_, request_id_);

  if (use_stream_on_response_) {
    auto read_handle = std::make_unique<SharedMemoryDataConsumerHandle>(
        base::BindOnce(&Context::CancelBodyStreaming, this),
        &body_stream_writer_);

    // Here |body_stream_writer_| has an indirect reference to |this| and that
    // creates a reference cycle, but it is not a problem because the cycle
    // will break if one of the following happens:
    //  1) The body data transfer is done (with or without an error).
    //  2) |read_handle| (and its reader) is detached.
    client_->DidReceiveResponse(response, std::move(read_handle));
    // TODO(yhirano): Support ftp listening and multipart
    return;
  }

  client_->DidReceiveResponse(response);

  // DidReceiveResponse() may have triggered a cancel, causing the |client_| to
  // go away.
  if (!client_)
    return;
}

void WebURLLoaderImpl::Context::OnStartLoadingResponseBody(
    mojo::ScopedDataPipeConsumerHandle body) {
  if (client_)
    client_->DidStartLoadingResponseBody(std::move(body));
}

void WebURLLoaderImpl::Context::OnReceivedData(
    std::unique_ptr<ReceivedData> data) {
  const char* payload = data->payload();
  int data_length = data->length();
  if (!client_)
    return;

  TRACE_EVENT_WITH_FLOW0(
      "loading", "WebURLLoaderImpl::Context::OnReceivedData",
      this, TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT);

  // We dispatch the data even when |useStreamOnResponse()| is set, in order
  // to make Devtools work.
  client_->DidReceiveData(payload, data_length);

  if (use_stream_on_response_) {
    body_stream_writer_->AddData(std::move(data));
  }
}

void WebURLLoaderImpl::Context::OnTransferSizeUpdated(int transfer_size_diff) {
  client_->DidReceiveTransferSizeUpdate(transfer_size_diff);
}

void WebURLLoaderImpl::Context::OnReceivedCachedMetadata(
    const char* data, int len) {
  if (!client_)
    return;
  TRACE_EVENT_WITH_FLOW0(
      "loading", "WebURLLoaderImpl::Context::OnReceivedCachedMetadata",
      this, TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT);
  client_->DidReceiveCachedMetadata(data, len);
}

void WebURLLoaderImpl::Context::OnCompletedRequest(
    const network::URLLoaderCompletionStatus& status) {
  int64_t total_transfer_size = status.encoded_data_length;
  int64_t encoded_body_size = status.encoded_body_length;

  if (body_stream_writer_ && status.error_code != net::OK)
    body_stream_writer_->Fail();
  body_stream_writer_.reset();

  if (client_) {
    TRACE_EVENT_WITH_FLOW0(
        "loading", "WebURLLoaderImpl::Context::OnCompletedRequest",
        this, TRACE_EVENT_FLAG_FLOW_IN);

    if (status.error_code != net::OK) {
      client_->DidFail(PopulateURLError(status, url_), total_transfer_size,
                       encoded_body_size, status.decoded_body_length);
    } else {
      client_->DidFinishLoading(status.completion_time, total_transfer_size,
                                encoded_body_size, status.decoded_body_length,
                                status.should_report_corb_blocking,
                                status.cors_preflight_timing_info);
    }
  }
}

WebURLLoaderImpl::Context::~Context() {
  // We must be already cancelled at this point.
  DCHECK_LT(request_id_, 0);
}

void WebURLLoaderImpl::Context::CancelBodyStreaming() {
  scoped_refptr<Context> protect(this);

  if (body_stream_writer_) {
    body_stream_writer_->Fail();
    body_stream_writer_.reset();
  }
  if (client_) {
    // TODO(yhirano): Set |stale_copy_in_cache| appropriately if possible.
    client_->DidFail(WebURLError(net::ERR_ABORTED, url_),
                     WebURLLoaderClient::kUnknownEncodedDataLength, 0, 0);
  }

  // Notify the browser process that the request is canceled.
  Cancel();
}

bool WebURLLoaderImpl::Context::CanHandleDataURLRequestLocally(
    const WebURLRequest& request) const {
  if (!request.Url().ProtocolIs(url::kDataScheme))
    return false;

  // The fast paths for data URL, Start() and HandleDataURL(), don't support
  // the PassResponsePipeToClient option.
  if (request.PassResponsePipeToClient())
    return false;

  // Data url requests from object tags may need to be intercepted as streams
  // and so need to be sent to the browser.
  if (request.GetRequestContext() == blink::mojom::RequestContextType::OBJECT)
    return false;

  // Optimize for the case where we can handle a data URL locally.  We must
  // skip this for data URLs targetted at frames since those could trigger a
  // download.
  //
  // NOTE: We special case MIME types we can render both for performance
  // reasons as well as to support unit tests.

  if (request.GetFrameType() !=
          network::mojom::RequestContextFrameType::kTopLevel &&
      request.GetFrameType() !=
          network::mojom::RequestContextFrameType::kNested)
    return true;

  std::string mime_type, unused_charset;
  if (net::DataURL::Parse(request.Url(), &mime_type, &unused_charset,
                          nullptr) &&
      blink::IsSupportedMimeType(mime_type))
    return true;

  return false;
}

void WebURLLoaderImpl::Context::HandleDataURL() {
  DCHECK_NE(defers_loading_, DEFERRED_DATA);
  if (defers_loading_ == SHOULD_DEFER) {
      defers_loading_ = DEFERRED_DATA;
      return;
  }

  network::ResourceResponseInfo info;
  std::string data;

  int error_code = GetInfoFromDataURL(url_, &info, &data);

  if (error_code == net::OK) {
    OnReceivedResponse(info);
    auto size = data.size();
    if (size != 0)
      OnReceivedData(std::make_unique<FixedReceivedData>(data.data(), size));
  }

  network::URLLoaderCompletionStatus status(error_code);
  status.encoded_body_length = data.size();
  status.decoded_body_length = data.size();
  OnCompletedRequest(status);
}

// WebURLLoaderImpl::RequestPeerImpl ------------------------------------------

WebURLLoaderImpl::RequestPeerImpl::RequestPeerImpl(Context* context,
                                                   bool discard_body)
    : context_(context), discard_body_(discard_body) {}

void WebURLLoaderImpl::RequestPeerImpl::OnUploadProgress(uint64_t position,
                                                         uint64_t size) {
  context_->OnUploadProgress(position, size);
}

bool WebURLLoaderImpl::RequestPeerImpl::OnReceivedRedirect(
    const net::RedirectInfo& redirect_info,
    const network::ResourceResponseInfo& info) {
  return context_->OnReceivedRedirect(redirect_info, info);
}

void WebURLLoaderImpl::RequestPeerImpl::OnReceivedResponse(
    const network::ResourceResponseInfo& info) {
  context_->OnReceivedResponse(info);
}

void WebURLLoaderImpl::RequestPeerImpl::OnStartLoadingResponseBody(
    mojo::ScopedDataPipeConsumerHandle body) {
  context_->OnStartLoadingResponseBody(std::move(body));
}

void WebURLLoaderImpl::RequestPeerImpl::OnReceivedData(
    std::unique_ptr<ReceivedData> data) {
  if (discard_body_)
    return;
  context_->OnReceivedData(std::move(data));
}

void WebURLLoaderImpl::RequestPeerImpl::OnTransferSizeUpdated(
    int transfer_size_diff) {
  context_->OnTransferSizeUpdated(transfer_size_diff);
}

void WebURLLoaderImpl::RequestPeerImpl::OnReceivedCachedMetadata(
    const char* data,
    int len) {
  if (discard_body_)
    return;
  context_->OnReceivedCachedMetadata(data, len);
}

void WebURLLoaderImpl::RequestPeerImpl::OnCompletedRequest(
    const network::URLLoaderCompletionStatus& status) {
  context_->OnCompletedRequest(status);
}

// WebURLLoaderImpl -----------------------------------------------------------

WebURLLoaderImpl::WebURLLoaderImpl(
    ResourceDispatcher* resource_dispatcher,
    std::unique_ptr<WebResourceLoadingTaskRunnerHandle> task_runner_handle,
    scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory)
    : WebURLLoaderImpl(resource_dispatcher,
                       std::move(task_runner_handle),
                       std::move(url_loader_factory),
                       nullptr) {}

WebURLLoaderImpl::WebURLLoaderImpl(
    ResourceDispatcher* resource_dispatcher,
    std::unique_ptr<WebResourceLoadingTaskRunnerHandle> task_runner_handle,
    scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
    mojom::KeepAliveHandlePtr keep_alive_handle)
    : context_(new Context(this,
                           resource_dispatcher,
                           std::move(task_runner_handle),
                           std::move(url_loader_factory),
                           std::move(keep_alive_handle))) {}

WebURLLoaderImpl::~WebURLLoaderImpl() {
  Cancel();
}

void WebURLLoaderImpl::PopulateURLResponse(
    const WebURL& url,
    const network::ResourceResponseInfo& info,
    WebURLResponse* response,
    bool report_security_info,
    int request_id) {
  response->SetCurrentRequestUrl(url);
  response->SetResponseTime(info.response_time);
  response->SetMIMEType(WebString::FromUTF8(info.mime_type));
  response->SetTextEncodingName(WebString::FromUTF8(info.charset));
  response->SetExpectedContentLength(info.content_length);
  response->SetHasMajorCertificateErrors(
      net::IsCertStatusError(info.cert_status) &&
      !net::IsCertStatusMinorError(info.cert_status));
  response->SetCTPolicyCompliance(info.ct_policy_compliance);
  response->SetIsLegacySymantecCert(info.is_legacy_symantec_cert);
  response->SetIsLegacyTLSVersion(info.is_legacy_tls_version);
  response->SetAppCacheID(info.appcache_id);
  response->SetAppCacheManifestURL(info.appcache_manifest_url);
  response->SetWasCached(!info.load_timing.request_start_time.is_null() &&
                         info.response_time <
                             info.load_timing.request_start_time);
  response->SetRemoteIPAddress(
      WebString::FromUTF8(info.socket_address.HostForURL()));
  response->SetRemotePort(info.socket_address.port());
  response->SetConnectionID(info.load_timing.socket_log_id);
  response->SetConnectionReused(info.load_timing.socket_reused);
  response->SetWasFetchedViaSPDY(info.was_fetched_via_spdy);
  response->SetWasFetchedViaServiceWorker(info.was_fetched_via_service_worker);
  response->SetWasFallbackRequiredByServiceWorker(
      info.was_fallback_required_by_service_worker);
  response->SetType(info.response_type);
  response->SetURLListViaServiceWorker(info.url_list_via_service_worker);
  response->SetCacheStorageCacheName(
      info.is_in_cache_storage
          ? blink::WebString::FromUTF8(info.cache_storage_cache_name)
          : blink::WebString());
  blink::WebVector<blink::WebString> cors_exposed_header_names(
      info.cors_exposed_header_names.size());
  std::transform(
      info.cors_exposed_header_names.begin(),
      info.cors_exposed_header_names.end(), cors_exposed_header_names.begin(),
      [](const std::string& h) { return blink::WebString::FromLatin1(h); });
  response->SetCorsExposedHeaderNames(cors_exposed_header_names);
  response->SetDidServiceWorkerNavigationPreload(
      info.did_service_worker_navigation_preload);
  response->SetEncodedDataLength(info.encoded_data_length);
  response->SetAlpnNegotiatedProtocol(
      WebString::FromUTF8(info.alpn_negotiated_protocol));
  response->SetConnectionInfo(info.connection_info);
  response->SetAsyncRevalidationRequested(info.async_revalidation_requested);
  response->SetNetworkAccessed(info.network_accessed);
  response->SetRequestId(request_id);
  response->SetIsSignedExchangeInnerResponse(
      info.is_signed_exchange_inner_response);

  SetSecurityStyleAndDetails(url, info, response, report_security_info);

  // If there's no received headers end time, don't set load timing.  This is
  // the case for non-HTTP requests, requests that don't go over the wire, and
  // certain error cases.
  if (!info.load_timing.receive_headers_end.is_null()) {
    WebURLLoadTiming timing;
    PopulateURLLoadTiming(info.load_timing, &timing);
    timing.SetWorkerStart(info.service_worker_start_time);
    timing.SetWorkerReady(info.service_worker_ready_time);
    response->SetLoadTiming(timing);
  }

  if (info.raw_request_response_info.get()) {
    WebHTTPLoadInfo load_info;

    load_info.SetHTTPStatusCode(
        info.raw_request_response_info->http_status_code);
    load_info.SetHTTPStatusText(WebString::FromLatin1(
        info.raw_request_response_info->http_status_text));

    load_info.SetRequestHeadersText(WebString::FromLatin1(
        info.raw_request_response_info->request_headers_text));
    load_info.SetResponseHeadersText(WebString::FromLatin1(
        info.raw_request_response_info->response_headers_text));
    const HeadersVector& request_headers =
        info.raw_request_response_info->request_headers;
    for (auto it = request_headers.begin(); it != request_headers.end(); ++it) {
      load_info.AddRequestHeader(WebString::FromLatin1(it->first),
                                 WebString::FromLatin1(it->second));
    }
    const HeadersVector& response_headers =
        info.raw_request_response_info->response_headers;
    for (auto it = response_headers.begin(); it != response_headers.end();
         ++it) {
      load_info.AddResponseHeader(WebString::FromLatin1(it->first),
                                  WebString::FromLatin1(it->second));
    }
    response->SetHTTPLoadInfo(load_info);
  }

  const net::HttpResponseHeaders* headers = info.headers.get();
  if (!headers)
    return;

  WebURLResponse::HTTPVersion version = WebURLResponse::kHTTPVersionUnknown;
  if (headers->GetHttpVersion() == net::HttpVersion(0, 9))
    version = WebURLResponse::kHTTPVersion_0_9;
  else if (headers->GetHttpVersion() == net::HttpVersion(1, 0))
    version = WebURLResponse::kHTTPVersion_1_0;
  else if (headers->GetHttpVersion() == net::HttpVersion(1, 1))
    version = WebURLResponse::kHTTPVersion_1_1;
  else if (headers->GetHttpVersion() == net::HttpVersion(2, 0))
    version = WebURLResponse::kHTTPVersion_2_0;
  response->SetHTTPVersion(version);
  response->SetHTTPStatusCode(headers->response_code());
  response->SetHTTPStatusText(WebString::FromLatin1(headers->GetStatusText()));

  // Build up the header map.
  size_t iter = 0;
  std::string name;
  std::string value;
  while (headers->EnumerateHeaderLines(&iter, &name, &value)) {
    response->AddHTTPHeaderField(WebString::FromLatin1(name),
                                 WebString::FromLatin1(value));
  }
}

// static
WebURLError WebURLLoaderImpl::PopulateURLError(
    const network::URLLoaderCompletionStatus& status,
    const GURL& url) {
  DCHECK_NE(net::OK, status.error_code);
  const WebURLError::HasCopyInCache has_copy_in_cache =
      status.exists_in_cache ? WebURLError::HasCopyInCache::kTrue
                             : WebURLError::HasCopyInCache::kFalse;
  if (status.cors_error_status)
    return WebURLError(*status.cors_error_status, has_copy_in_cache, url);
  return WebURLError(status.error_code, status.extended_error_code,
                     has_copy_in_cache,
                     WebURLError::IsWebSecurityViolation::kFalse, url);
}

void WebURLLoaderImpl::LoadSynchronously(
    const WebURLRequest& request,
    WebURLLoaderClient* client,
    WebURLResponse& response,
    base::Optional<WebURLError>& error,
    WebData& data,
    int64_t& encoded_data_length,
    int64_t& encoded_body_length,
    blink::WebBlobInfo& downloaded_blob) {
  TRACE_EVENT0("loading", "WebURLLoaderImpl::loadSynchronously");
  SyncLoadResponse sync_load_response;

  DCHECK(!context_->client());
  context_->set_client(client);
  context_->Start(request, &sync_load_response);

  const GURL& final_url = sync_load_response.url;

  // TODO(tc): For file loads, we may want to include a more descriptive
  // status code or status text.
  const int error_code = sync_load_response.error_code;
  if (error_code != net::OK) {
    if (sync_load_response.cors_error) {
      error = WebURLError(*sync_load_response.cors_error,
                          WebURLError::HasCopyInCache::kFalse, final_url);
    } else {
      // SyncResourceHandler returns ERR_ABORTED for CORS redirect errors,
      // so we treat the error as a web security violation.
      const WebURLError::IsWebSecurityViolation is_web_security_violation =
          error_code == net::ERR_ABORTED
              ? WebURLError::IsWebSecurityViolation::kTrue
              : WebURLError::IsWebSecurityViolation::kFalse;
      error = WebURLError(error_code, sync_load_response.extended_error_code,
                          WebURLError::HasCopyInCache::kFalse,
                          is_web_security_violation, final_url);
    }
    return;
  }

  PopulateURLResponse(final_url, sync_load_response.info, &response,
                      request.ReportRawHeaders(), context_->request_id());
  encoded_data_length = sync_load_response.info.encoded_data_length;
  encoded_body_length = sync_load_response.info.encoded_body_length;
  if (sync_load_response.downloaded_blob) {
    downloaded_blob = blink::WebBlobInfo(
        WebString::FromLatin1(sync_load_response.downloaded_blob->uuid),
        WebString::FromLatin1(sync_load_response.downloaded_blob->content_type),
        sync_load_response.downloaded_blob->size,
        sync_load_response.downloaded_blob->blob.PassHandle());
  }

  data.Assign(sync_load_response.data.data(), sync_load_response.data.size());
}

void WebURLLoaderImpl::LoadAsynchronously(const WebURLRequest& request,
                                          WebURLLoaderClient* client) {
  TRACE_EVENT_WITH_FLOW0("loading", "WebURLLoaderImpl::loadAsynchronously",
                         this, TRACE_EVENT_FLAG_FLOW_OUT);
  DCHECK(!context_->client());

  context_->set_client(client);
  context_->Start(request, nullptr);
}

void WebURLLoaderImpl::Cancel() {
  context_->Cancel();
}

void WebURLLoaderImpl::SetDefersLoading(bool value) {
  context_->SetDefersLoading(value);
}

void WebURLLoaderImpl::DidChangePriority(WebURLRequest::Priority new_priority,
                                         int intra_priority_value) {
  context_->DidChangePriority(new_priority, intra_priority_value);
}

// static
// We have this function at the bottom of this file because it confuses
// syntax highliting.
net::NetworkTrafficAnnotationTag
WebURLLoaderImpl::Context::GetTrafficAnnotationTag(
    const blink::WebURLRequest& request) {
  switch (request.GetRequestContext()) {
    case blink::mojom::RequestContextType::UNSPECIFIED:
    case blink::mojom::RequestContextType::AUDIO:
    case blink::mojom::RequestContextType::BEACON:
    case blink::mojom::RequestContextType::CSP_REPORT:
    case blink::mojom::RequestContextType::DOWNLOAD:
    case blink::mojom::RequestContextType::EVENT_SOURCE:
    case blink::mojom::RequestContextType::FETCH:
    case blink::mojom::RequestContextType::FONT:
    case blink::mojom::RequestContextType::FORM:
    case blink::mojom::RequestContextType::FRAME:
    case blink::mojom::RequestContextType::HYPERLINK:
    case blink::mojom::RequestContextType::IFRAME:
    case blink::mojom::RequestContextType::IMAGE:
    case blink::mojom::RequestContextType::IMAGE_SET:
    case blink::mojom::RequestContextType::IMPORT:
    case blink::mojom::RequestContextType::INTERNAL:
    case blink::mojom::RequestContextType::LOCATION:
    case blink::mojom::RequestContextType::MANIFEST:
    case blink::mojom::RequestContextType::PING:
    case blink::mojom::RequestContextType::PREFETCH:
    case blink::mojom::RequestContextType::SCRIPT:
    case blink::mojom::RequestContextType::SERVICE_WORKER:
    case blink::mojom::RequestContextType::SHARED_WORKER:
    case blink::mojom::RequestContextType::SUBRESOURCE:
    case blink::mojom::RequestContextType::STYLE:
    case blink::mojom::RequestContextType::TRACK:
    case blink::mojom::RequestContextType::VIDEO:
    case blink::mojom::RequestContextType::WORKER:
    case blink::mojom::RequestContextType::XML_HTTP_REQUEST:
    case blink::mojom::RequestContextType::XSLT:
      return net::DefineNetworkTrafficAnnotation("blink_resource_loader", R"(
      semantics {
        sender: "Blink Resource Loader"
        description:
          "Blink-initiated request, which includes all resources for "
          "normal page loads, chrome URLs, and downloads."
        trigger:
          "The user navigates to a URL or downloads a file. Also when a "
          "webpage, ServiceWorker, or chrome:// uses any network communication."
        data: "Anything the initiator wants to send."
        destination: OTHER
      }
      policy {
        cookies_allowed: YES
        cookies_store: "user"
        setting: "These requests cannot be disabled in settings."
        policy_exception_justification:
          "Not implemented. Without these requests, Chrome will be unable "
          "to load any webpage."
      })");

    case blink::mojom::RequestContextType::EMBED:
    case blink::mojom::RequestContextType::OBJECT:
    case blink::mojom::RequestContextType::PLUGIN:
      return net::DefineNetworkTrafficAnnotation(
          "blink_extension_resource_loader", R"(
        semantics {
          sender: "Blink Resource Loader"
          description:
            "Blink-initiated request for resources required for NaCl instances "
            "tagged with <embed> or <object>, or installed extensions."
          trigger:
            "An extension or NaCl instance may initiate a request at any time, "
            "even in the background."
          data: "Anything the initiator wants to send."
          destination: OTHER
        }
        policy {
          cookies_allowed: YES
          cookies_store: "user"
          setting:
            "These requests cannot be disabled in settings, but they are "
            "sent only if user installs extensions."
          chrome_policy {
            ExtensionInstallBlacklist {
              ExtensionInstallBlacklist: {
                entries: '*'
              }
            }
          }
        })");

    case blink::mojom::RequestContextType::FAVICON:
      return net::DefineNetworkTrafficAnnotation("favicon_loader", R"(
        semantics {
          sender: "Blink Resource Loader"
          description:
            "Chrome sends a request to download favicon for a URL."
          trigger:
            "Navigating to a URL."
          data: "None."
          destination: WEBSITE
        }
        policy {
          cookies_allowed: YES
          cookies_store: "user"
          setting: "These requests cannot be disabled in settings."
          policy_exception_justification:
            "Not implemented."
        })");
  }

  return net::NetworkTrafficAnnotationTag::NotReached();
}

}  // namespace content