Initial checkin of chromecast content embedder (cast_shell) and related build scripts.

chromecast/shell/browser/url_request_context_factory.cc

+// 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 "chromecast/shell/browser/url_request_context_factory.h"
+
+#include "base/command_line.h"
+#include "base/files/file_path.h"
+#include "base/macros.h"
+#include "base/path_service.h"
+#include "base/threading/worker_pool.h"
+#include "chromecast/shell/browser/cast_http_user_agent_settings.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/cookie_store_factory.h"
+#include "content/public/common/content_switches.h"
+#include "content/public/common/url_constants.h"
+#include "net/cert/cert_verifier.h"
+#include "net/cookies/cookie_store.h"
+#include "net/dns/host_resolver.h"
+#include "net/http/http_auth_handler_factory.h"
+#include "net/http/http_cache.h"
+#include "net/http/http_network_layer.h"
+#include "net/http/http_server_properties_impl.h"
+#include "net/http/http_stream_factory.h"
+#include "net/ocsp/nss_ocsp.h"
+#include "net/proxy/proxy_service.h"
+#include "net/socket/next_proto.h"
+#include "net/ssl/default_server_bound_cert_store.h"
+#include "net/ssl/server_bound_cert_service.h"
+#include "net/ssl/ssl_config_service_defaults.h"
+#include "net/url_request/data_protocol_handler.h"
+#include "net/url_request/url_request_context.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "net/url_request/url_request_job_factory_impl.h"
+
+namespace chromecast {
+namespace shell {
+
+namespace {
+
+const char kCookieStoreFile[] = "Cookies";
+
+}  // namespace
+
+// Private classes to expose URLRequestContextGetter that call back to the
+// URLRequestContextFactory to create the URLRequestContext on demand.
+//
+// The URLRequestContextFactory::URLRequestContextGetter class is used for both
+// the system and media URLRequestCotnexts.
+class URLRequestContextFactory::URLRequestContextGetter
+    : public net::URLRequestContextGetter {
+ public:
+  URLRequestContextGetter(URLRequestContextFactory* factory, bool is_media)
+      : is_media_(is_media),
+        factory_(factory) {
+  }
+
+  virtual net::URLRequestContext* GetURLRequestContext() OVERRIDE {
+    if (!request_context_) {
+      if (is_media_) {
+        request_context_.reset(factory_->CreateMediaRequestContext());
+      } else {
+        request_context_.reset(factory_->CreateSystemRequestContext());
+        // Set request context used by NSS for Crl requests.
+        net::SetURLRequestContextForNSSHttpIO(request_context_.get());
+      }
+    }
+    return request_context_.get();
+  }
+
+  virtual scoped_refptr<base::SingleThreadTaskRunner>
+      GetNetworkTaskRunner() const OVERRIDE {
+    return content::BrowserThread::GetMessageLoopProxyForThread(
+        content::BrowserThread::IO);
+  }
+
+ private:
+  virtual ~URLRequestContextGetter() {}
+
+  const bool is_media_;
+  URLRequestContextFactory* const factory_;
+  scoped_ptr<net::URLRequestContext> request_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(URLRequestContextGetter);
+};
+
+// The URLRequestContextFactory::MainURLRequestContextGetter class is used for
+// the main URLRequestContext.
+class URLRequestContextFactory::MainURLRequestContextGetter
+    : public net::URLRequestContextGetter {
+ public:
+  MainURLRequestContextGetter(URLRequestContextFactory* factory,
+                              content::BrowserContext* browser_context,
+                              content::ProtocolHandlerMap* protocol_handlers)
+      : browser_context_(browser_context),
+        factory_(factory) {
+    std::swap(protocol_handlers_, *protocol_handlers);
+  }
+
+  virtual net::URLRequestContext* GetURLRequestContext() OVERRIDE {
+    if (!request_context_) {
+      request_context_.reset(factory_->CreateMainRequestContext(
+          browser_context_, &protocol_handlers_));
+      protocol_handlers_.clear();
+    }
+    return request_context_.get();
+  }
+
+  virtual scoped_refptr<base::SingleThreadTaskRunner>
+      GetNetworkTaskRunner() const OVERRIDE {
+    return content::BrowserThread::GetMessageLoopProxyForThread(
+        content::BrowserThread::IO);
+  }
+
+ private:
+  virtual ~MainURLRequestContextGetter() {}
+
+  content::BrowserContext* const browser_context_;
+  URLRequestContextFactory* const factory_;
+  content::ProtocolHandlerMap protocol_handlers_;
+  scoped_ptr<net::URLRequestContext> request_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(MainURLRequestContextGetter);
+};
+
+URLRequestContextFactory::URLRequestContextFactory()
+    : system_dependencies_initialized_(false),
+      main_dependencies_initialized_(false),
+      media_dependencies_initialized_(false) {
+}
+
+URLRequestContextFactory::~URLRequestContextFactory() {
+}
+
+void URLRequestContextFactory::InitializeOnUIThread() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  // Cast http user agent settings must be initialized in UI thread
+  // because it registers itself to pref notification observer which is not
+  // thread safe.
+  http_user_agent_settings_.reset(new CastHttpUserAgentSettings());
+}
+
+net::URLRequestContextGetter* URLRequestContextFactory::CreateMainGetter(
+    content::BrowserContext* browser_context,
+    content::ProtocolHandlerMap* protocol_handlers) {
+  DCHECK(!main_getter_) << "Main URLRequestContextGetter already initialized";
+  main_getter_ = new MainURLRequestContextGetter(this,
+                                                 browser_context,
+                                                 protocol_handlers);
+  return main_getter_.get();
+}
+
+net::URLRequestContextGetter* URLRequestContextFactory::GetMainGetter() {
+  CHECK(main_getter_);
+  return main_getter_.get();
+}
+
+net::URLRequestContextGetter* URLRequestContextFactory::GetSystemGetter() {
+  if (!system_getter_) {
+    system_getter_ = new URLRequestContextGetter(this, false);
+  }
+  return system_getter_.get();
+}
+
+net::URLRequestContextGetter* URLRequestContextFactory::GetMediaGetter() {
+  if (!media_getter_) {
+    media_getter_ = new URLRequestContextGetter(this, true);
+  }
+  return media_getter_.get();
+}
+
+void URLRequestContextFactory::InitializeSystemContextDependencies() {
+  if (!system_dependencies_initialized_) {

[mmenke, 2014/07/08 15:43:59]

Optional for this and and the next two functions:  There's weak preference in
Chrome to use early returns when there's nothing else to do, unless there's a
specific reason not to.  This reduces the indentation and makes code a little
easier to follow.  Admittedly, this code isn't too complicated, anyways.

[lcwu1, 2014/07/09 02:16:29]

Done.

+    host_resolver_ = net::HostResolver::CreateDefaultResolver(NULL);
+
+    server_bound_cert_service_.reset(new net::ServerBoundCertService(
+        new net::DefaultServerBoundCertStore(NULL),
+        base::WorkerPool::GetTaskRunner(true)));
+
+    cert_verifier_.reset(net::CertVerifier::CreateDefault());
+
+    ssl_config_service_ = new net::SSLConfigServiceDefaults;
+
+    transport_security_state_.reset(new net::TransportSecurityState());
+    http_auth_handler_factory_.reset(
+        net::HttpAuthHandlerFactory::CreateDefault(host_resolver_.get()));
+
+    http_server_properties_.reset(new net::HttpServerPropertiesImpl);

[mmenke, 2014/07/08 15:43:59]

For performance reasons, may want an on-disk HttpServerProperties (And for
security, and on-disk ServerBoundCertService), but should be fine without them,
for now.

[lcwu1, 2014/07/09 02:16:29]

Added a TODO here.

+
+    proxy_service_.reset(net::ProxyService::CreateUsingSystemProxyResolver(
+        net::ProxyService::CreateSystemProxyConfigService(
+            content::BrowserThread::GetMessageLoopProxyForThread(
+                content::BrowserThread::IO).get(),
+            content::BrowserThread::UnsafeGetMessageLoopForThread(
+                content::BrowserThread::FILE)),
+        0,
+        NULL));
+    system_dependencies_initialized_ = true;
+  }
+}
+
+void URLRequestContextFactory::InitializeMainContextDependencies(
+    net::HttpTransactionFactory* transaction_factory,
+    content::ProtocolHandlerMap* protocol_handlers) {
+  if (!main_dependencies_initialized_) {
+    main_transaction_factory_.reset(transaction_factory);
+    main_job_factory_.reset(new net::URLRequestJobFactoryImpl());
+    // Keep ProtocolHandlers added in sync with
+    // ShellContentBrowserClient::IsHandledURL().
+    bool set_protocol = false;
+    for (content::ProtocolHandlerMap::iterator it =
+        protocol_handlers->begin();
+        it != protocol_handlers->end();
+        ++it) {
+      set_protocol = main_job_factory_->SetProtocolHandler(
+          it->first, it->second.release());
+      DCHECK(set_protocol);
+    }
+    set_protocol = main_job_factory_->SetProtocolHandler(
+        url::kDataScheme,
+        new net::DataProtocolHandler);
+    DCHECK(set_protocol);
+    main_dependencies_initialized_ = true;
+  }
+}
+
+void URLRequestContextFactory::InitializeMediaContextDependencies(
+    net::HttpTransactionFactory* transaction_factory) {
+  if (!media_dependencies_initialized_) {
+    media_transaction_factory_.reset(transaction_factory);
+    media_dependencies_initialized_ = true;
+  }
+}
+
+void URLRequestContextFactory::PopulateNetworkSessionParams(
+    bool ignore_certificate_errors,
+    net::HttpNetworkSession::Params* params) {
+  params->host_resolver = host_resolver_.get();
+  params->cert_verifier = cert_verifier_.get();
+  params->server_bound_cert_service = server_bound_cert_service_.get();
+  params->ssl_config_service = ssl_config_service_.get();
+  params->transport_security_state = transport_security_state_.get();
+  params->http_auth_handler_factory = http_auth_handler_factory_.get();
+  params->http_server_properties = http_server_properties_->GetWeakPtr();
+  params->ignore_certificate_errors = ignore_certificate_errors;
+  params->proxy_service = proxy_service_.get();
+
+  // TODO(lcwu): http://crbug.com/329681. Remove this once spdy is enabled
+  // by deafult at the content level.

[mmenke, 2014/07/08 15:43:59]

nit:  deafult -> default

[lcwu1, 2014/07/09 02:16:29]

Done.

+  params->next_protos = net::NextProtosSpdy31();
+  params->use_alternate_protocols = true;
+}
+
+net::URLRequestContext* URLRequestContextFactory::CreateSystemRequestContext() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
+  InitializeSystemContextDependencies();
+  net::HttpNetworkSession::Params system_params;
+  PopulateNetworkSessionParams(false, &system_params);
+  system_transaction_factory_.reset(new net::HttpNetworkLayer(
+      new net::HttpNetworkSession(system_params)));
+
+  net::URLRequestContext* system_context = new net::URLRequestContext();
+  system_context->set_host_resolver(host_resolver_.get());
+  system_context->set_server_bound_cert_service(
+      server_bound_cert_service_.get());
+  system_context->set_cert_verifier(cert_verifier_.get());
+  system_context->set_proxy_service(proxy_service_.get());
+  system_context->set_ssl_config_service(ssl_config_service_.get());
+  system_context->set_transport_security_state(
+      transport_security_state_.get());
+  system_context->set_http_auth_handler_factory(
+      http_auth_handler_factory_.get());
+  system_context->set_http_server_properties(
+      http_server_properties_->GetWeakPtr());
+  system_context->set_http_transaction_factory(
+      system_transaction_factory_.get());
+  system_context->set_http_user_agent_settings(
+      http_user_agent_settings_.get());

[mmenke, 2014/07/08 15:43:59]

Should probably set up an in-memory cookie store for the system context as well.

[lcwu1, 2014/07/09 02:16:29]

Done.

+  return system_context;
+}
+
+net::URLRequestContext* URLRequestContextFactory::CreateMediaRequestContext() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
+  DCHECK(main_getter_)
+      << "Getting MediaRequestContext before MainRequestContext";
+  net::URLRequestContext* main_context = main_getter_->GetURLRequestContext();
+
+  // Set non caching backend.
+  net::HttpNetworkSession* main_session =
+      main_transaction_factory_->GetSession();
+  InitializeMediaContextDependencies(
+      new net::HttpNetworkLayer(main_session));
+
+  net::URLRequestContext* media_context = new net::URLRequestContext();
+  media_context->CopyFrom(main_context);
+  media_context->set_http_transaction_factory(
+      media_transaction_factory_.get());
+  return media_context;
+}
+
+net::URLRequestContext* URLRequestContextFactory::CreateMainRequestContext(
+    content::BrowserContext* browser_context,
+    content::ProtocolHandlerMap* protocol_handlers) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
+  InitializeSystemContextDependencies();
+
+  net::HttpCache::BackendFactory* main_backend =
+      net::HttpCache::DefaultBackend::InMemory(16 * 1024 * 1024);
+
+  bool ignore_certificate_errors = false;
+  CommandLine* cmd_line = CommandLine::ForCurrentProcess();
+  if (cmd_line->HasSwitch(switches::kIgnoreCertificateErrors)) {
+    ignore_certificate_errors = true;
+  }
+  net::HttpNetworkSession::Params network_session_params;
+  PopulateNetworkSessionParams(ignore_certificate_errors,
+                               &network_session_params);
+  InitializeMainContextDependencies(
+      new net::HttpCache(network_session_params, main_backend),
+      protocol_handlers);
+
+  content::CookieStoreConfig cookie_config(
+      browser_context->GetPath().Append(kCookieStoreFile),
+      content::CookieStoreConfig::PERSISTANT_SESSION_COOKIES,
+      NULL, NULL);
+  cookie_config.background_task_runner =
+      scoped_refptr<base::SequencedTaskRunner>();
+  scoped_refptr<net::CookieStore> cookie_store =
+      content::CreateCookieStore(cookie_config);
+
+  net::URLRequestContext* main_context = new net::URLRequestContext();
+  main_context->set_host_resolver(host_resolver_.get());
+  main_context->set_server_bound_cert_service(
+      server_bound_cert_service_.get());
+  main_context->set_cert_verifier(cert_verifier_.get());
+  main_context->set_proxy_service(proxy_service_.get());
+  main_context->set_ssl_config_service(ssl_config_service_.get());
+  main_context->set_transport_security_state(transport_security_state_.get());
+  main_context->set_http_auth_handler_factory(
+      http_auth_handler_factory_.get());
+  main_context->set_http_server_properties(
+      http_server_properties_->GetWeakPtr());
+  main_context->set_cookie_store(cookie_store.get());
+  main_context->set_http_user_agent_settings(
+      http_user_agent_settings_.get());
+
+  main_context->set_http_transaction_factory(
+      main_transaction_factory_.get());
+  main_context->set_job_factory(main_job_factory_.get());
+  return main_context;
+}
+
+}  // namespace shell
+}  // namespace chromecast