without the plumbing!

content/browser/devtools/devtools_url_request_interceptor.cc

+// Copyright 2017 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/browser/devtools/devtools_url_request_interceptor.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/strings/stringprintf.h"
+#include "base/supports_user_data.h"
+#include "content/browser/devtools/devtools_agent_host_impl.h"
+#include "content/browser/devtools/devtools_url_interceptor_request_job.h"
+#include "content/browser/devtools/protocol/network_handler.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/devtools_agent_host.h"
+#include "content/public/browser/resource_request_info.h"
+#include "net/http/http_request_headers.h"
+#include "net/url_request/url_request.h"
+
+namespace content {
+
+namespace {
+const char kDevToolsURLRequestInterceptorKeyName[] =
+    "DevToolsURLRequestInterceptor";
+
+class DevToolsURLRequestInterceptorUserData
+    : public base::SupportsUserData::Data {
+ public:
+  explicit DevToolsURLRequestInterceptorUserData(
+      DevToolsURLRequestInterceptor* devtools_url_request_interceptor)
+      : devtools_url_request_interceptor_(devtools_url_request_interceptor) {}
+
+  DevToolsURLRequestInterceptor* devtools_url_request_interceptor() const {
+    return devtools_url_request_interceptor_;
+  }
+
+ private:
+  DevToolsURLRequestInterceptor* devtools_url_request_interceptor_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsURLRequestInterceptorUserData);
+};
+
+}  // namespace
+
+DevToolsURLRequestInterceptor::DevToolsURLRequestInterceptor(
+    BrowserContext* browser_context)
+    : browser_context_(browser_context), weak_ptr_factory_(this) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  browser_context_->SetUserData(
+      kDevToolsURLRequestInterceptorKeyName,
+      base::MakeUnique<DevToolsURLRequestInterceptorUserData>(this));
+
+  // The State object needs to be created on the IO thread or we can't use
+  // WeakPtr when posing tasks to run on the IO thread.
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::BindOnce(&DevToolsURLRequestInterceptor::CreateStateOnIoThread,
+                     weak_ptr_factory_.GetWeakPtr()));
+}
+
+DevToolsURLRequestInterceptor::~DevToolsURLRequestInterceptor() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  // The BrowserContext owns us, so we don't need to unregister
+  // DevToolsURLRequestInterceptorUserData explicitly.
+}
+
+net::URLRequestJob* DevToolsURLRequestInterceptor::MaybeInterceptRequest(
+    net::URLRequest* request,
+    net::NetworkDelegate* network_delegate) const {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  base::WeakPtr<protocol::NetworkHandler> network_handler;
+  if (!state().ShouldInterceptRequest(request, &network_handler))
+    return nullptr;
+
+  bool is_redirect;
+  return new DevToolsURLInterceptorRequestJob(
+      state().GetWeakPtr(), state().GetIdForRequest(request, &is_redirect),
+      request, network_delegate, network_handler, is_redirect);
+}
+
+net::URLRequestJob* DevToolsURLRequestInterceptor::MaybeInterceptRedirect(
+    net::URLRequest* request,
+    net::NetworkDelegate* network_delegate,
+    const GURL& location) const {
+  return nullptr;
+}
+
+net::URLRequestJob* DevToolsURLRequestInterceptor::MaybeInterceptResponse(
+    net::URLRequest* request,
+    net::NetworkDelegate* network_delegate) const {
+  return nullptr;
+}
+
+void DevToolsURLRequestInterceptor::State::AllowRequest(
+    protocol::String interception_id,
+    CommandCallback callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DevToolsURLInterceptorRequestJob* job = GetJob(interception_id);
+  if (!job) {
+    std::move(callback).Run(CommandStatus::UnknownInterceptionId);
+  } else {
+    std::move(callback).Run(job->AllowRequest());
+  }
+}
+
+void DevToolsURLRequestInterceptor::State::BlockRequest(
+    protocol::String interception_id,
+    net::Error error_reason,
+    CommandCallback callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DevToolsURLInterceptorRequestJob* job = GetJob(interception_id);
+  if (!job) {
+    std::move(callback).Run(CommandStatus::UnknownInterceptionId);
+  } else {
+    std::move(callback).Run(job->BlockRequest(error_reason));
+  }
+}
+
+void DevToolsURLRequestInterceptor::State::ModifyRequest(
+    protocol::String interception_id,
+    std::unique_ptr<Modifications> modifications,
+    CommandCallback callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DevToolsURLInterceptorRequestJob* job = GetJob(interception_id);
+  if (!job) {
+    std::move(callback).Run(CommandStatus::UnknownInterceptionId);
+  } else {
+    std::move(callback).Run(job->ModifyRequest(std::move(modifications)));
+  }
+}
+
+void DevToolsURLRequestInterceptor::State::MockResponse(
+    protocol::String interception_id,
+    protocol::String raw_response,
+    CommandCallback callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DevToolsURLInterceptorRequestJob* job = GetJob(interception_id);
+  if (!job) {
+    std::move(callback).Run(CommandStatus::UnknownInterceptionId);
+  } else {
+    std::move(callback).Run(job->MockResponse(std::move(raw_response)));
+  }
+}
+
+DevToolsURLRequestInterceptor::State::State()
+    : next_id_(0), weak_ptr_factory_(this) {}
+
+DevToolsURLRequestInterceptor::State::~State() {}
+
+bool DevToolsURLRequestInterceptor::State::ShouldInterceptRequest(
+    const net::URLRequest* request,
+    base::WeakPtr<protocol::NetworkHandler>* network_handler) const {
+  const ResourceRequestInfo* resource_request_info =
+      ResourceRequestInfo::ForRequest(request);
+  if (!resource_request_info)
+    return false;
+  int frame_tree_node_id = resource_request_info->GetFrameTreeNodeId();
+  if (frame_tree_node_id == -1) {
+    // |frame_tree_node_id| is not set for renderer side requests, fall back to
+    // the RenderFrameID.
+    int render_frame_id = resource_request_info->GetRenderFrameID();
+    const auto find_it = intercepted_render_frames_.find(render_frame_id);
+    if (find_it == intercepted_render_frames_.end())
+      return false;
+    *network_handler = find_it->second;
+  } else {
+    // |frame_tree_node_id| is set for browser side navigations, so use that
+    // because the RenderFrameID isn't known.
+    const auto find_it = intercepted_frame_tree_nodes_.find(frame_tree_node_id);
+    if (find_it == intercepted_frame_tree_nodes_.end())
+      return false;
+    *network_handler = find_it->second;
+  }
+
+  // We don't want to intercept our own sub requests.
+  return sub_requests_.find(request) == sub_requests_.end();
+}
+
+void DevToolsURLRequestInterceptor::State::StartInterceptingRequestsFrom(
+    int render_frame_id,
+    int frame_tree_node_id,
+    base::WeakPtr<protocol::NetworkHandler> network_handler) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  intercepted_render_frames_[render_frame_id] = network_handler;
+  intercepted_frame_tree_nodes_[frame_tree_node_id] = network_handler;
+}
+
+void DevToolsURLRequestInterceptor::State::StopInterceptingRequestsFrom(
+    int render_frame_id,
+    int frame_tree_node_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  intercepted_render_frames_.erase(render_frame_id);
+  intercepted_frame_tree_nodes_.erase(frame_tree_node_id);
+}
+
+void DevToolsURLRequestInterceptor::State::RegisterSubRequest(
+    const net::URLRequest* sub_request) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(sub_requests_.find(sub_request) == sub_requests_.end());
+  sub_requests_.insert(sub_request);
+}
+
+void DevToolsURLRequestInterceptor::State::UnregisterSubRequest(
+    const net::URLRequest* sub_request) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(sub_requests_.find(sub_request) != sub_requests_.end());
+  sub_requests_.erase(sub_request);
+}
+
+void DevToolsURLRequestInterceptor::State::ExpectRequestAfterRedirect(
+    const net::URLRequest* request,
+    std::string id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  expected_redirects_[request] = id;
+}
+
+std::string DevToolsURLRequestInterceptor::State::GetIdForRequest(
+    const net::URLRequest* request,
+    bool* is_redirect) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  auto find_it = expected_redirects_.find(request);
+  if (find_it == expected_redirects_.end()) {
+    *is_redirect = false;
+    return base::StringPrintf("id-%zu", ++next_id_);
+  }
+  *is_redirect = true;
+  std::string id = find_it->second;
+  expected_redirects_.erase(find_it);
+  return id;
+}
+
+DevToolsURLInterceptorRequestJob* DevToolsURLRequestInterceptor::State::GetJob(
+    const std::string& interception_id) const {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  const auto it = interception_id_to_job_map_.find(interception_id);
+  if (it == interception_id_to_job_map_.end())
+    return nullptr;
+  return it->second;
+}
+
+void DevToolsURLRequestInterceptor::State::RegisterJob(
+    DevToolsURLInterceptorRequestJob* job,
+    const std::string& interception_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  interception_id_to_job_map_[interception_id] = job;
+}
+
+void DevToolsURLRequestInterceptor::State::UnregisterJob(
+    const std::string& interception_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  interception_id_to_job_map_.erase(interception_id);
+}
+
+// static
+DevToolsURLRequestInterceptor*
+DevToolsURLRequestInterceptor::FromBrowserContext(BrowserContext* context) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  return static_cast<DevToolsURLRequestInterceptorUserData*>(
+             context->GetUserData(kDevToolsURLRequestInterceptorKeyName))
+      ->devtools_url_request_interceptor();
+}
+
+void DevToolsURLRequestInterceptor::CreateStateOnIoThread() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  state_.reset(new State());
+}
+
+}  // namespace content