Initialize ios/web_view translate with a system-wide URLRequestContext.

ios/web_view/internal/app/web_view_io_thread.mm

+// 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 "ios/web_view/internal/app/web_view_io_thread.h"
+
+#include <stddef.h>
+
+#include <utility>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/compiler_specific.h"
+#include "base/debug/leak_tracker.h"
+#include "base/environment.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/metrics/field_trial.h"
+#include "base/stl_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/threading/sequenced_worker_pool.h"
+#include "base/threading/thread.h"
+#include "base/time/time.h"
+#include "base/trace_event/trace_event.h"
+#include "components/net_log/chrome_net_log.h"
+#include "components/network_session_configurator/network_session_configurator.h"
+#include "components/prefs/pref_service.h"
+#include "components/proxy_config/ios/proxy_service_factory.h"
+#include "components/proxy_config/pref_proxy_config_tracker.h"
+#include "components/variations/variations_associated_data.h"
+#include "components/version_info/version_info.h"
+#include "ios/web/public/user_agent.h"
+#include "ios/web/public/web_client.h"
+#include "ios/web/public/web_thread.h"
+#include "ios/web_view/internal/web_view_network_delegate.h"
+#include "net/base/sdch_manager.h"
+#include "net/cert/cert_verifier.h"
+#include "net/cert/ct_known_logs.h"
+#include "net/cert/ct_log_verifier.h"
+#include "net/cert/ct_policy_enforcer.h"
+#include "net/cert/ct_verifier.h"
+#include "net/cert/multi_log_ct_verifier.h"
+#include "net/cert/multi_threaded_cert_verifier.h"
+#include "net/cookies/cookie_monster.h"
+#include "net/cookies/cookie_store.h"
+#include "net/dns/host_cache.h"
+#include "net/dns/host_resolver.h"
+#include "net/http/http_auth_filter.h"
+#include "net/http/http_auth_handler_factory.h"
+#include "net/http/http_auth_preferences.h"
+#include "net/http/http_network_layer.h"
+#include "net/http/http_server_properties_impl.h"
+#include "net/log/net_log_event_type.h"
+#include "net/nqe/external_estimate_provider.h"
+#include "net/nqe/network_quality_estimator.h"
+#include "net/proxy/proxy_config_service.h"
+#include "net/proxy/proxy_script_fetcher_impl.h"
+#include "net/proxy/proxy_service.h"
+#include "net/socket/tcp_client_socket.h"
+#include "net/spdy/chromium/spdy_session.h"
+#include "net/ssl/channel_id_service.h"
+#include "net/ssl/default_channel_id_store.h"
+#include "net/url_request/data_protocol_handler.h"
+#include "net/url_request/file_protocol_handler.h"
+#include "net/url_request/static_http_user_agent_settings.h"
+#include "net/url_request/url_request_context.h"
+#include "net/url_request/url_request_context_builder.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "net/url_request/url_request_job_factory_impl.h"
+#include "url/url_constants.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+// The WebViewIOThread object must outlive any tasks posted to the IO thread
+// before the Quit task, so base::Bind() calls are not refcounted.
+
+namespace {
+
+const char kSupportedAuthSchemes[] = "basic,digest,ntlm";
+
+// Field trial for network quality estimator. Seeds RTT and downstream
+// throughput observations with values that correspond to the connection type
+// determined by the operating system.
+const char kNetworkQualityEstimatorFieldTrialName[] = "NetworkQualityEstimator";
+
+// Used for the "system" URLRequestContext.
+class SystemURLRequestContext : public net::URLRequestContext {
+ public:
+  SystemURLRequestContext() = default;
+
+ private:
+  ~SystemURLRequestContext() override { AssertNoURLRequests(); }
+};
+
+std::unique_ptr<net::HostResolver> CreateGlobalHostResolver(
+    net::NetLog* net_log) {
+  TRACE_EVENT0("startup", "WebViewIOThread::CreateGlobalHostResolver");
+
+  std::unique_ptr<net::HostResolver> global_host_resolver =
+      net::HostResolver::CreateSystemResolver(net::HostResolver::Options(),
+                                              net_log);
+
+  return global_host_resolver;
+}
+
+}  // namespace
+
+class WebViewIOThread::LoggingNetworkChangeObserver
+    : public net::NetworkChangeNotifier::IPAddressObserver,
+      public net::NetworkChangeNotifier::ConnectionTypeObserver,
+      public net::NetworkChangeNotifier::NetworkChangeObserver {
+ public:
+  // |net_log| must remain valid throughout our lifetime.
+  explicit LoggingNetworkChangeObserver(net::NetLog* net_log)
+      : net_log_(net_log) {
+    net::NetworkChangeNotifier::AddIPAddressObserver(this);
+    net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
+    net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
+  }
+
+  ~LoggingNetworkChangeObserver() override {
+    net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
+    net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
+    net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
+  }
+
+  // NetworkChangeNotifier::IPAddressObserver implementation.
+  void OnIPAddressChanged() override {
+    VLOG(1) << "Observed a change to the network IP addresses";
+
+    net_log_->AddGlobalEntry(
+        net::NetLogEventType::NETWORK_IP_ADDRESSES_CHANGED);
+  }
+
+  // NetworkChangeNotifier::ConnectionTypeObserver implementation.
+  void OnConnectionTypeChanged(
+      net::NetworkChangeNotifier::ConnectionType type) override {
+    std::string type_as_string =
+        net::NetworkChangeNotifier::ConnectionTypeToString(type);
+
+    VLOG(1) << "Observed a change to network connectivity state "
+            << type_as_string;
+
+    net_log_->AddGlobalEntry(
+        net::NetLogEventType::NETWORK_CONNECTIVITY_CHANGED,
+        net::NetLog::StringCallback("new_connection_type", &type_as_string));
+  }
+
+  // NetworkChangeNotifier::NetworkChangeObserver implementation.
+  void OnNetworkChanged(
+      net::NetworkChangeNotifier::ConnectionType type) override {
+    std::string type_as_string =
+        net::NetworkChangeNotifier::ConnectionTypeToString(type);
+
+    VLOG(1) << "Observed a network change to state " << type_as_string;
+
+    net_log_->AddGlobalEntry(
+        net::NetLogEventType::NETWORK_CHANGED,
+        net::NetLog::StringCallback("new_connection_type", &type_as_string));
+  }
+
+ private:
+  net::NetLog* net_log_;
+  DISALLOW_COPY_AND_ASSIGN(LoggingNetworkChangeObserver);
+};
+
+class SystemURLRequestContextGetter : public net::URLRequestContextGetter {
+ public:
+  explicit SystemURLRequestContextGetter(WebViewIOThread* io_thread);
+
+  // Implementation for net::UrlRequestContextGetter.
+  net::URLRequestContext* GetURLRequestContext() override;
+  scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
+      const override;
+
+  // Tells the getter that the URLRequestContext is about to be shut down.
+  void Shutdown();
+
+ protected:
+  ~SystemURLRequestContextGetter() override;
+
+ private:
+  WebViewIOThread* io_thread_;  // Weak pointer, owned by ApplicationContext.
+  scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
+
+  base::debug::LeakTracker<SystemURLRequestContextGetter> leak_tracker_;
+};
+
+SystemURLRequestContextGetter::SystemURLRequestContextGetter(
+    WebViewIOThread* io_thread)
+    : io_thread_(io_thread),
+      network_task_runner_(
+          web::WebThread::GetTaskRunnerForThread(web::WebThread::IO)) {}
+
+SystemURLRequestContextGetter::~SystemURLRequestContextGetter() {}
+
+net::URLRequestContext* SystemURLRequestContextGetter::GetURLRequestContext() {
+  DCHECK_CURRENTLY_ON(web::WebThread::IO);
+  if (!io_thread_)
+    return nullptr;
+  DCHECK(io_thread_->globals()->system_request_context.get());
+
+  return io_thread_->globals()->system_request_context.get();
+}
+
+scoped_refptr<base::SingleThreadTaskRunner>
+SystemURLRequestContextGetter::GetNetworkTaskRunner() const {
+  return network_task_runner_;
+}
+
+void SystemURLRequestContextGetter::Shutdown() {
+  DCHECK_CURRENTLY_ON(web::WebThread::IO);
+  io_thread_ = nullptr;
+  NotifyContextShuttingDown();
+}
+
+WebViewIOThread::Globals::SystemRequestContextLeakChecker::
+    SystemRequestContextLeakChecker(Globals* globals)
+    : globals_(globals) {
+  DCHECK(globals_);
+}
+
+WebViewIOThread::Globals::SystemRequestContextLeakChecker::
+    ~SystemRequestContextLeakChecker() {
+  if (globals_->system_request_context.get())
+    globals_->system_request_context->AssertNoURLRequests();
+}
+
+WebViewIOThread::Globals::Globals()
+    : system_request_context_leak_checker(this) {}
+
+WebViewIOThread::Globals::~Globals() {}
+
+// |local_state| is passed in explicitly in order to (1) reduce implicit
+// dependencies and (2) make WebViewIOThread more flexible for testing.
+WebViewIOThread::WebViewIOThread(PrefService* local_state,
+                                 net_log::ChromeNetLog* net_log)
+    : net_log_(net_log),
+      globals_(nullptr),
+      creation_time_(base::TimeTicks::Now()),
+      weak_factory_(this) {
+  pref_proxy_config_tracker_ =
+      ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
+          local_state);
+  ssl_config_service_manager_.reset(
+      ssl_config::SSLConfigServiceManager::CreateDefaultManager(
+          local_state,
+          web::WebThread::GetTaskRunnerForThread(web::WebThread::IO)));
+
+  web::WebThread::SetDelegate(web::WebThread::IO, this);
+}
+
+WebViewIOThread::~WebViewIOThread() {
+  // This isn't needed for production code, but in tests, WebViewIOThread may
+  // be multiply constructed.
+  web::WebThread::SetDelegate(web::WebThread::IO, nullptr);
+
+  pref_proxy_config_tracker_->DetachFromPrefService();
+  DCHECK(!globals_);
+}
+
+WebViewIOThread::Globals* WebViewIOThread::globals() {
+  DCHECK_CURRENTLY_ON(web::WebThread::IO);
+  return globals_;
+}
+
+void WebViewIOThread::SetGlobalsForTesting(Globals* globals) {
+  DCHECK_CURRENTLY_ON(web::WebThread::IO);
+  DCHECK(!globals || !globals_);
+  globals_ = globals;
+}
+
+net_log::ChromeNetLog* WebViewIOThread::net_log() {
+  return net_log_;
+}
+
+void WebViewIOThread::ChangedToOnTheRecord() {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  web::WebThread::PostTask(
+      web::WebThread::IO, FROM_HERE,
+      base::Bind(&WebViewIOThread::ChangedToOnTheRecordOnIOThread,
+                 base::Unretained(this)));
+}
+
+net::URLRequestContextGetter*
+WebViewIOThread::system_url_request_context_getter() {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  if (!system_url_request_context_getter_.get()) {
+    InitSystemRequestContext();
+  }
+  return system_url_request_context_getter_.get();
+}
+
+void WebViewIOThread::Init() {
+  TRACE_EVENT0("startup", "WebViewIOThread::Init");
+  DCHECK_CURRENTLY_ON(web::WebThread::IO);
+
+  DCHECK(!globals_);
+  globals_ = new Globals;
+
+  // Add an observer that will emit network change events to the ChromeNetLog.
+  // Assuming NetworkChangeNotifier dispatches in FIFO order, we should be
+  // logging the network change before other IO thread consumers respond to it.
+  network_change_observer_.reset(new LoggingNetworkChangeObserver(net_log_));
+
+  // Setup the HistogramWatcher to run on the IO thread.
+  net::NetworkChangeNotifier::InitHistogramWatcher();
+
+  std::unique_ptr<ios_web_view::WebViewNetworkDelegate> chrome_network_delegate(
+      new ios_web_view::WebViewNetworkDelegate());
+
+  globals_->system_network_delegate = std::move(chrome_network_delegate);
+  globals_->host_resolver = CreateGlobalHostResolver(net_log_);
+
+  std::map<std::string, std::string> network_quality_estimator_params;
+  variations::GetVariationParams(kNetworkQualityEstimatorFieldTrialName,
+                                 &network_quality_estimator_params);
+
+  std::unique_ptr<net::ExternalEstimateProvider> external_estimate_provider;
+  // Pass ownership.
+  globals_->network_quality_estimator.reset(new net::NetworkQualityEstimator(
+      std::move(external_estimate_provider), network_quality_estimator_params,
+      net_log_));
+
+  globals_->cert_verifier = net::CertVerifier::CreateDefault();
+
+  globals_->transport_security_state.reset(new net::TransportSecurityState());
+
+  std::vector<scoped_refptr<const net::CTLogVerifier>> ct_logs(
+      net::ct::CreateLogVerifiersForKnownLogs());
+
+  net::MultiLogCTVerifier* ct_verifier = new net::MultiLogCTVerifier();
+  globals_->cert_transparency_verifier.reset(ct_verifier);
+  // Add built-in logs
+  ct_verifier->AddLogs(ct_logs);
+
+  globals_->ct_policy_enforcer.reset(new net::CTPolicyEnforcer());
+
+  globals_->ssl_config_service = GetSSLConfigService();
+
+  CreateDefaultAuthHandlerFactory();
+  globals_->http_server_properties.reset(new net::HttpServerPropertiesImpl());
+  // In-memory cookie store.
+  globals_->system_cookie_store.reset(new net::CookieMonster(nullptr, nullptr));
+  // In-memory channel ID store.
+  globals_->system_channel_id_service.reset(
+      new net::ChannelIDService(new net::DefaultChannelIDStore(nullptr)));
+  globals_->system_cookie_store->SetChannelIDServiceID(
+      globals_->system_channel_id_service->GetUniqueID());
+  globals_->http_user_agent_settings.reset(new net::StaticHttpUserAgentSettings(
+      std::string(),
+      web::GetWebClient()->GetUserAgent(web::UserAgentType::MOBILE)));
+
+  params_.ignore_certificate_errors = false;
+  params_.enable_user_alternate_protocol_ports = false;
+
+  std::string quic_user_agent_id = std::string();
+  quic_user_agent_id.append(
+      version_info::GetProductNameAndVersionForUserAgent());
+  quic_user_agent_id.push_back(' ');
+  quic_user_agent_id.append(web::BuildOSCpuInfo());
+
+  network_session_configurator::ParseFieldTrials(
+      /*is_quic_force_disabled=*/false,
+      /*is_quic_force_enabled=*/false, quic_user_agent_id, &params_);
+
+  // InitSystemRequestContext turns right around and posts a task back
+  // to the IO thread, so we can't let it run until we know the IO
+  // thread has started.
+  //
+  // Note that since we are at WebThread::Init time, the UI thread
+  // is blocked waiting for the thread to start.  Therefore, posting
+  // this task to the main thread's message loop here is guaranteed to
+  // get it onto the message loop while the WebViewIOThread object still
+  // exists.  However, the message might not be processed on the UI
+  // thread until after WebViewIOThread is gone, so use a weak pointer.
+  web::WebThread::PostTask(
+      web::WebThread::UI, FROM_HERE,
+      base::Bind(&WebViewIOThread::InitSystemRequestContext,
+                 weak_factory_.GetWeakPtr()));
+}
+
+void WebViewIOThread::CleanUp() {
+  system_url_request_context_getter_->Shutdown();
+  system_url_request_context_getter_ = nullptr;
+
+  // Release objects that the net::URLRequestContext could have been pointing
+  // to.
+
+  // Shutdown the HistogramWatcher on the IO thread.
+  net::NetworkChangeNotifier::ShutdownHistogramWatcher();
+
+  // This must be reset before the ChromeNetLog is destroyed.
+  network_change_observer_.reset();
+
+  system_proxy_config_service_.reset();
+
+  delete globals_;
+  globals_ = nullptr;
+
+  base::debug::LeakTracker<SystemURLRequestContextGetter>::CheckForLeaks();
+}
+
+void WebViewIOThread::CreateDefaultAuthHandlerFactory() {
+  std::vector<std::string> supported_schemes =
+      base::SplitString(kSupportedAuthSchemes, ",", base::TRIM_WHITESPACE,
+                        base::SPLIT_WANT_NONEMPTY);
+  globals_->http_auth_preferences.reset(
+      new net::HttpAuthPreferences(supported_schemes, std::string()));
+  globals_->http_auth_handler_factory =
+      net::HttpAuthHandlerRegistryFactory::Create(
+          globals_->http_auth_preferences.get(), globals_->host_resolver.get());
+}
+
+void WebViewIOThread::ClearHostCache() {
+  DCHECK_CURRENTLY_ON(web::WebThread::IO);
+
+  net::HostCache* host_cache = globals_->host_resolver->GetHostCache();
+  if (host_cache)
+    host_cache->clear();
+}
+
+const net::HttpNetworkSession::Params& WebViewIOThread::NetworkSessionParams()
+    const {
+  return params_;
+}
+
+base::TimeTicks WebViewIOThread::creation_time() const {
+  return creation_time_;
+}
+
+net::SSLConfigService* WebViewIOThread::GetSSLConfigService() {
+  return ssl_config_service_manager_->Get();
+}
+
+void WebViewIOThread::ChangedToOnTheRecordOnIOThread() {
+  DCHECK_CURRENTLY_ON(web::WebThread::IO);
+
+  // Clear the host cache to avoid showing entries from the OTR session
+  // in about:net-internals.
+  ClearHostCache();
+}
+
+void WebViewIOThread::InitSystemRequestContext() {
+  if (system_url_request_context_getter_.get())
+    return;
+  // If we're in unit_tests, WebViewIOThread may not be run.
+  if (!web::WebThread::IsMessageLoopValid(web::WebThread::IO))
+    return;
+  system_proxy_config_service_ = ProxyServiceFactory::CreateProxyConfigService(
+      pref_proxy_config_tracker_.get());
+
+  system_url_request_context_getter_ = new SystemURLRequestContextGetter(this);
+  // Safe to post an unretained this pointer, since WebViewIOThread is
+  // guaranteed to outlive the IO WebThread.
+  web::WebThread::PostTask(
+      web::WebThread::IO, FROM_HERE,
+      base::Bind(&WebViewIOThread::InitSystemRequestContextOnIOThread,
+                 base::Unretained(this)));
+}
+
+void WebViewIOThread::InitSystemRequestContextOnIOThread() {
+  DCHECK_CURRENTLY_ON(web::WebThread::IO);
+  DCHECK(!globals_->system_proxy_service.get());
+  DCHECK(system_proxy_config_service_.get());
+
+  globals_->system_proxy_service = ProxyServiceFactory::CreateProxyService(
+      net_log_, nullptr, globals_->system_network_delegate.get(),
+      std::move(system_proxy_config_service_), true /* quick_check_enabled */);
+
+  globals_->system_request_context.reset(
+      ConstructSystemRequestContext(globals_, params_, net_log_));
+}
+
+net::URLRequestContext* WebViewIOThread::ConstructSystemRequestContext(
+    WebViewIOThread::Globals* globals,
+    const net::HttpNetworkSession::Params& params,
+    net::NetLog* net_log) {
+  net::URLRequestContext* context = new SystemURLRequestContext;
+  context->set_net_log(net_log);
+  context->set_host_resolver(globals->host_resolver.get());
+  context->set_cert_verifier(globals->cert_verifier.get());
+  context->set_transport_security_state(
+      globals->transport_security_state.get());
+  context->set_cert_transparency_verifier(
+      globals->cert_transparency_verifier.get());
+  context->set_ssl_config_service(globals->ssl_config_service.get());
+  context->set_http_auth_handler_factory(
+      globals->http_auth_handler_factory.get());
+  context->set_proxy_service(globals->system_proxy_service.get());
+  context->set_ct_policy_enforcer(globals->ct_policy_enforcer.get());
+
+  net::URLRequestJobFactoryImpl* system_job_factory =
+      new net::URLRequestJobFactoryImpl();
+  // Data URLs are always loaded through the system request context on iOS
+  // (due to UIWebView limitations).
+  bool set_protocol = system_job_factory->SetProtocolHandler(
+      url::kDataScheme, base::MakeUnique<net::DataProtocolHandler>());
+  DCHECK(set_protocol);
+  globals->system_url_request_job_factory.reset(system_job_factory);
+  context->set_job_factory(globals->system_url_request_job_factory.get());
+
+  context->set_cookie_store(globals->system_cookie_store.get());
+  context->set_channel_id_service(globals->system_channel_id_service.get());
+  context->set_network_delegate(globals->system_network_delegate.get());
+  context->set_http_user_agent_settings(
+      globals->http_user_agent_settings.get());
+  context->set_network_quality_estimator(
+      globals->network_quality_estimator.get());
+
+  context->set_http_server_properties(globals->http_server_properties.get());
+
+  net::HttpNetworkSession::Params system_params(params);
+  net::URLRequestContextBuilder::SetHttpNetworkSessionComponents(
+      context, &system_params);
+
+  globals->system_http_network_session.reset(
+      new net::HttpNetworkSession(system_params));
+  globals->system_http_transaction_factory.reset(
+      new net::HttpNetworkLayer(globals->system_http_network_session.get()));
+  context->set_http_transaction_factory(
+      globals->system_http_transaction_factory.get());
+
+  return context;
+}