extensions/renderer/dispatcher.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/renderer/dispatcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/callback.h"
   9 #include "base/command_line.h"
  10 #include "base/debug/alias.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/metrics/histogram_macros.h"
  13 #include "base/metrics/user_metrics_action.h"
  14 #include "base/strings/string_piece.h"
  15 #include "base/strings/string_split.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/strings/utf_string_conversions.h"
  18 #include "base/time/time.h"
  19 #include "base/values.h"
  20 #include "content/grit/content_resources.h"
  21 #include "content/public/child/v8_value_converter.h"
  22 #include "content/public/common/content_switches.h"
  23 #include "content/public/common/url_constants.h"
  24 #include "content/public/renderer/render_frame.h"
  25 #include "content/public/renderer/render_thread.h"
  26 #include "extensions/common/api/messaging/message.h"
  27 #include "extensions/common/constants.h"
  28 #include "extensions/common/extension_api.h"
  29 #include "extensions/common/extension_messages.h"
  30 #include "extensions/common/extension_urls.h"
  31 #include "extensions/common/feature_switch.h"
  32 #include "extensions/common/features/behavior_feature.h"
  33 #include "extensions/common/features/feature.h"
  34 #include "extensions/common/features/feature_provider.h"
  35 #include "extensions/common/manifest.h"
  36 #include "extensions/common/manifest_constants.h"
  37 #include "extensions/common/manifest_handlers/background_info.h"
  38 #include "extensions/common/manifest_handlers/content_capabilities_handler.h"
  39 #include "extensions/common/manifest_handlers/externally_connectable.h"
  40 #include "extensions/common/manifest_handlers/options_page_info.h"
  41 #include "extensions/common/message_bundle.h"
  42 #include "extensions/common/permissions/permission_set.h"
  43 #include "extensions/common/permissions/permissions_data.h"
  44 #include "extensions/common/switches.h"
  45 #include "extensions/common/view_type.h"
  46 #include "extensions/renderer/api_activity_logger.h"
  47 #include "extensions/renderer/api_definitions_natives.h"
  48 #include "extensions/renderer/app_runtime_custom_bindings.h"
  49 #include "extensions/renderer/app_window_custom_bindings.h"
  50 #include "extensions/renderer/binding_generating_native_handler.h"
  51 #include "extensions/renderer/blob_native_handler.h"
  52 #include "extensions/renderer/content_watcher.h"
  53 #include "extensions/renderer/context_menus_custom_bindings.h"
  54 #include "extensions/renderer/css_native_handler.h"
  55 #include "extensions/renderer/dispatcher_delegate.h"
  56 #include "extensions/renderer/document_custom_bindings.h"
  57 #include "extensions/renderer/dom_activity_logger.h"
  58 #include "extensions/renderer/event_bindings.h"
  59 #include "extensions/renderer/extension_frame_helper.h"
  60 #include "extensions/renderer/extension_helper.h"
  61 #include "extensions/renderer/extensions_renderer_client.h"
  62 #include "extensions/renderer/file_system_natives.h"
  63 #include "extensions/renderer/guest_view/guest_view_internal_custom_bindings.h"
  64 #include "extensions/renderer/i18n_custom_bindings.h"
  65 #include "extensions/renderer/id_generator_custom_bindings.h"
  66 #include "extensions/renderer/lazy_background_page_native_handler.h"
  67 #include "extensions/renderer/logging_native_handler.h"
  68 #include "extensions/renderer/messaging_bindings.h"
  69 #include "extensions/renderer/module_system.h"
  70 #include "extensions/renderer/print_native_handler.h"
  71 #include "extensions/renderer/process_info_native_handler.h"
  72 #include "extensions/renderer/render_frame_observer_natives.h"
  73 #include "extensions/renderer/request_sender.h"
  74 #include "extensions/renderer/runtime_custom_bindings.h"
  75 #include "extensions/renderer/safe_builtins.h"
  76 #include "extensions/renderer/script_context.h"
  77 #include "extensions/renderer/script_context_set.h"
  78 #include "extensions/renderer/script_injection.h"
  79 #include "extensions/renderer/script_injection_manager.h"
  80 #include "extensions/renderer/send_request_natives.h"
  81 #include "extensions/renderer/set_icon_natives.h"
  82 #include "extensions/renderer/test_features_native_handler.h"
  83 #include "extensions/renderer/user_gestures_native_handler.h"
  84 #include "extensions/renderer/utils_native_handler.h"
  85 #include "extensions/renderer/v8_context_native_handler.h"
  86 #include "grit/extensions_renderer_resources.h"
  87 #include "third_party/WebKit/public/platform/WebString.h"
  88 #include "third_party/WebKit/public/platform/WebURLRequest.h"
  89 #include "third_party/WebKit/public/web/WebCustomElement.h"
  90 #include "third_party/WebKit/public/web/WebDataSource.h"
  91 #include "third_party/WebKit/public/web/WebDocument.h"
  92 #include "third_party/WebKit/public/web/WebFrame.h"
  93 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  94 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
  95 #include "third_party/WebKit/public/web/WebScopedUserGesture.h"
  96 #include "third_party/WebKit/public/web/WebSecurityPolicy.h"
  97 #include "third_party/WebKit/public/web/WebView.h"
  98 #include "third_party/mojo/src/mojo/public/js/constants.h"
  99 #include "ui/base/layout.h"
 100 #include "ui/base/resource/resource_bundle.h"
 101 #include "v8/include/v8.h"
 102
 103 using base::UserMetricsAction;
 104 using blink::WebDataSource;
 105 using blink::WebDocument;
 106 using blink::WebScopedUserGesture;
 107 using blink::WebSecurityPolicy;
 108 using blink::WebString;
 109 using blink::WebVector;
 110 using blink::WebView;
 111 using content::RenderThread;
 112
 113 namespace extensions {
 114
 115 namespace {
 116
 117 static const int64 kInitialExtensionIdleHandlerDelayMs = 5 * 1000;
 118 static const int64 kMaxExtensionIdleHandlerDelayMs = 5 * 60 * 1000;
 119 static const char kEventDispatchFunction[] = "dispatchEvent";
 120 static const char kOnSuspendEvent[] = "runtime.onSuspend";
 121 static const char kOnSuspendCanceledEvent[] = "runtime.onSuspendCanceled";
 122
 123 // Returns the global value for "chrome" from |context|. If one doesn't exist
 124 // creates a new object for it.
 125 //
 126 // Note that this isn't necessarily an object, since webpages can write, for
 127 // example, "window.chrome = true".
 128 v8::Local<v8::Value> GetOrCreateChrome(ScriptContext* context) {
 129   v8::Local<v8::String> chrome_string(
 130       v8::String::NewFromUtf8(context->isolate(), "chrome"));
 131   v8::Local<v8::Object> global(context->v8_context()->Global());
 132   v8::Local<v8::Value> chrome(global->Get(chrome_string));
 133   if (chrome->IsUndefined()) {
 134     chrome = v8::Object::New(context->isolate());
 135     global->Set(chrome_string, chrome);
 136   }
 137   return chrome;
 138 }
 139
 140 // Returns |value| cast to an object if possible, else an empty handle.
 141 v8::Local<v8::Object> AsObjectOrEmpty(v8::Local<v8::Value> value) {
 142   return value->IsObject() ? value.As<v8::Object>() : v8::Local<v8::Object>();
 143 }
 144
 145 // Calls a method |method_name| in a module |module_name| belonging to the
 146 // module system from |context|. Intended as a callback target from
 147 // ScriptContextSet::ForEach.
 148 void CallModuleMethod(const std::string& module_name,
 149                       const std::string& method_name,
 150                       const base::ListValue* args,
 151                       ScriptContext* context) {
 152   v8::HandleScope handle_scope(context->isolate());
 153   v8::Context::Scope context_scope(context->v8_context());
 154
 155   scoped_ptr<content::V8ValueConverter> converter(
 156       content::V8ValueConverter::create());
 157
 158   std::vector<v8::Local<v8::Value>> arguments;
 159   for (base::ListValue::const_iterator it = args->begin(); it != args->end();
 160        ++it) {
 161     arguments.push_back(converter->ToV8Value(*it, context->v8_context()));
 162   }
 163
 164   context->module_system()->CallModuleMethod(
 165       module_name, method_name, &arguments);
 166 }
 167
 168 // This handles the "chrome." root API object in script contexts.
 169 class ChromeNativeHandler : public ObjectBackedNativeHandler {
 170  public:
 171   explicit ChromeNativeHandler(ScriptContext* context)
 172       : ObjectBackedNativeHandler(context) {
 173     RouteFunction(
 174         "GetChrome",
 175         base::Bind(&ChromeNativeHandler::GetChrome, base::Unretained(this)));
 176   }
 177
 178   void GetChrome(const v8::FunctionCallbackInfo<v8::Value>& args) {
 179     args.GetReturnValue().Set(GetOrCreateChrome(context()));
 180   }
 181 };
 182
 183 }  // namespace
 184
 185 Dispatcher::Dispatcher(DispatcherDelegate* delegate)
 186     : delegate_(delegate),
 187       content_watcher_(new ContentWatcher()),
 188       source_map_(&ResourceBundle::GetSharedInstance()),
 189       v8_schema_registry_(new V8SchemaRegistry),
 190       is_webkit_initialized_(false),
 191       user_script_set_manager_observer_(this),
 192       webrequest_used_(false) {
 193   const base::CommandLine& command_line =
 194       *(base::CommandLine::ForCurrentProcess());
 195   set_idle_notifications_ =
 196       command_line.HasSwitch(switches::kExtensionProcess) ||
 197       command_line.HasSwitch(::switches::kSingleProcess);
 198
 199   if (set_idle_notifications_) {
 200     RenderThread::Get()->SetIdleNotificationDelayInMs(
 201         kInitialExtensionIdleHandlerDelayMs);
 202   }
 203
 204   RenderThread::Get()->RegisterExtension(SafeBuiltins::CreateV8Extension());
 205
 206   script_context_set_.reset(
 207       new ScriptContextSet(&extensions_, &active_extension_ids_));
 208   user_script_set_manager_.reset(new UserScriptSetManager(&extensions_));
 209   script_injection_manager_.reset(
 210       new ScriptInjectionManager(&extensions_, user_script_set_manager_.get()));
 211   user_script_set_manager_observer_.Add(user_script_set_manager_.get());
 212   request_sender_.reset(new RequestSender(this));
 213   PopulateSourceMap();
 214 }
 215
 216 Dispatcher::~Dispatcher() {
 217 }
 218
 219 void Dispatcher::OnRenderFrameCreated(content::RenderFrame* render_frame) {
 220   script_injection_manager_->OnRenderFrameCreated(render_frame);
 221 }
 222
 223 bool Dispatcher::IsExtensionActive(const std::string& extension_id) const {
 224   bool is_active =
 225       active_extension_ids_.find(extension_id) != active_extension_ids_.end();
 226   if (is_active)
 227     CHECK(extensions_.Contains(extension_id));
 228   return is_active;
 229 }
 230
 231 void Dispatcher::DidCreateScriptContext(
 232     blink::WebLocalFrame* frame,
 233     const v8::Local<v8::Context>& v8_context,
 234     int extension_group,
 235     int world_id) {
 236   const base::TimeTicks start_time = base::TimeTicks::Now();
 237
 238   ScriptContext* context = script_context_set_->Register(
 239       frame, v8_context, extension_group, world_id);
 240
 241   // Initialize origin permissions for content scripts, which can't be
 242   // initialized in |OnActivateExtension|.
 243   if (context->context_type() == Feature::CONTENT_SCRIPT_CONTEXT)
 244     InitOriginPermissions(context->extension());
 245
 246   {
 247     scoped_ptr<ModuleSystem> module_system(
 248         new ModuleSystem(context, &source_map_));
 249     context->set_module_system(module_system.Pass());
 250   }
 251   ModuleSystem* module_system = context->module_system();
 252
 253   // Enable natives in startup.
 254   ModuleSystem::NativesEnabledScope natives_enabled_scope(module_system);
 255
 256   RegisterNativeHandlers(module_system, context);
 257
 258   // chrome.Event is part of the public API (although undocumented). Make it
 259   // lazily evalulate to Event from event_bindings.js. For extensions only
 260   // though, not all webpages!
 261   if (context->extension()) {
 262     v8::Local<v8::Object> chrome = AsObjectOrEmpty(GetOrCreateChrome(context));
 263     if (!chrome.IsEmpty())
 264       module_system->SetLazyField(chrome, "Event", kEventBindings, "Event");
 265   }
 266
 267   UpdateBindingsForContext(context);
 268
 269   bool is_within_platform_app = IsWithinPlatformApp();
 270   // Inject custom JS into the platform app context.
 271   if (is_within_platform_app) {
 272     module_system->Require("platformApp");
 273   }
 274
 275   RequireGuestViewModules(context);
 276   delegate_->RequireAdditionalModules(context, is_within_platform_app);
 277
 278   const base::TimeDelta elapsed = base::TimeTicks::Now() - start_time;
 279   switch (context->context_type()) {
 280     case Feature::UNSPECIFIED_CONTEXT:
 281       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_Unspecified",
 282                           elapsed);
 283       break;
 284     case Feature::BLESSED_EXTENSION_CONTEXT:
 285       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_Blessed", elapsed);
 286       break;
 287     case Feature::UNBLESSED_EXTENSION_CONTEXT:
 288       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_Unblessed",
 289                           elapsed);
 290       break;
 291     case Feature::CONTENT_SCRIPT_CONTEXT:
 292       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_ContentScript",
 293                           elapsed);
 294       break;
 295     case Feature::WEB_PAGE_CONTEXT:
 296       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_WebPage", elapsed);
 297       break;
 298     case Feature::BLESSED_WEB_PAGE_CONTEXT:
 299       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_BlessedWebPage",
 300                           elapsed);
 301       break;
 302     case Feature::WEBUI_CONTEXT:
 303       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_WebUI", elapsed);
 304       break;
 305   }
 306
 307   VLOG(1) << "Num tracked contexts: " << script_context_set_->size();
 308 }
 309
 310 void Dispatcher::WillReleaseScriptContext(
 311     blink::WebLocalFrame* frame,
 312     const v8::Local<v8::Context>& v8_context,
 313     int world_id) {
 314   ScriptContext* context = script_context_set_->GetByV8Context(v8_context);
 315   if (!context)
 316     return;
 317
 318   context->DispatchOnUnloadEvent();
 319   // TODO(kalman): Make |request_sender| use |context->AddInvalidationObserver|.
 320   // In fact |request_sender_| should really be owned by ScriptContext.
 321   request_sender_->InvalidateSource(context);
 322
 323   script_context_set_->Remove(context);
 324   VLOG(1) << "Num tracked contexts: " << script_context_set_->size();
 325 }
 326
 327 void Dispatcher::DidCreateDocumentElement(blink::WebLocalFrame* frame) {
 328   // Note: use GetEffectiveDocumentURL not just frame->document()->url()
 329   // so that this also injects the stylesheet on about:blank frames that
 330   // are hosted in the extension process.
 331   GURL effective_document_url = ScriptContext::GetEffectiveDocumentURL(
 332       frame, frame->document().url(), true /* match_about_blank */);
 333
 334   const Extension* extension =
 335       extensions_.GetExtensionOrAppByURL(effective_document_url);
 336
 337   if (extension &&
 338       (extension->is_extension() || extension->is_platform_app())) {
 339     int resource_id = extension->is_platform_app() ? IDR_PLATFORM_APP_CSS
 340                                                    : IDR_EXTENSION_FONTS_CSS;
 341     std::string stylesheet = ResourceBundle::GetSharedInstance()
 342                                  .GetRawDataResource(resource_id)
 343                                  .as_string();
 344     base::ReplaceFirstSubstringAfterOffset(
 345         &stylesheet, 0, "$FONTFAMILY", system_font_family_);
 346     base::ReplaceFirstSubstringAfterOffset(
 347         &stylesheet, 0, "$FONTSIZE", system_font_size_);
 348
 349     // Blink doesn't let us define an additional user agent stylesheet, so
 350     // we insert the default platform app or extension stylesheet into all
 351     // documents that are loaded in each app or extension.
 352     frame->document().insertStyleSheet(WebString::fromUTF8(stylesheet));
 353   }
 354
 355   // If this is an extension options page, and the extension has opted into
 356   // using Chrome styles, then insert the Chrome extension stylesheet.
 357   if (extension && extension->is_extension() &&
 358       OptionsPageInfo::ShouldUseChromeStyle(extension) &&
 359       effective_document_url == OptionsPageInfo::GetOptionsPage(extension)) {
 360     frame->document().insertStyleSheet(
 361         WebString::fromUTF8(ResourceBundle::GetSharedInstance()
 362                                 .GetRawDataResource(IDR_EXTENSION_CSS)
 363                                 .as_string()));
 364   }
 365
 366   // In testing, the document lifetime events can happen after the render
 367   // process shutdown event.
 368   // See: http://crbug.com/21508 and http://crbug.com/500851
 369   if (content_watcher_) {
 370     content_watcher_->DidCreateDocumentElement(frame);
 371   }
 372 }
 373
 374 void Dispatcher::OnExtensionResponse(int request_id,
 375                                      bool success,
 376                                      const base::ListValue& response,
 377                                      const std::string& error) {
 378   request_sender_->HandleResponse(request_id, success, response, error);
 379 }
 380
 381 void Dispatcher::DispatchEvent(const std::string& extension_id,
 382                                const std::string& event_name) const {
 383   base::ListValue args;
 384   args.Set(0, new base::StringValue(event_name));
 385   args.Set(1, new base::ListValue());
 386
 387   // Needed for Windows compilation, since kEventBindings is declared extern.
 388   const char* local_event_bindings = kEventBindings;
 389   script_context_set_->ForEach(
 390       extension_id, base::Bind(&CallModuleMethod, local_event_bindings,
 391                                kEventDispatchFunction, &args));
 392 }
 393
 394 void Dispatcher::InvokeModuleSystemMethod(content::RenderFrame* render_frame,
 395                                           const std::string& extension_id,
 396                                           const std::string& module_name,
 397                                           const std::string& function_name,
 398                                           const base::ListValue& args,
 399                                           bool user_gesture) {
 400   scoped_ptr<WebScopedUserGesture> web_user_gesture;
 401   if (user_gesture)
 402     web_user_gesture.reset(new WebScopedUserGesture);
 403
 404   script_context_set_->ForEach(
 405       extension_id, render_frame,
 406       base::Bind(&CallModuleMethod, module_name, function_name, &args));
 407
 408   // Reset the idle handler each time there's any activity like event or message
 409   // dispatch, for which Invoke is the chokepoint.
 410   if (set_idle_notifications_) {
 411     RenderThread::Get()->ScheduleIdleHandler(
 412         kInitialExtensionIdleHandlerDelayMs);
 413   }
 414
 415   // Tell the browser process when an event has been dispatched with a lazy
 416   // background page active.
 417   const Extension* extension = extensions_.GetByID(extension_id);
 418   if (extension && BackgroundInfo::HasLazyBackgroundPage(extension) &&
 419       module_name == kEventBindings &&
 420       function_name == kEventDispatchFunction) {
 421     content::RenderFrame* background_frame =
 422         ExtensionFrameHelper::GetBackgroundPageFrame(extension_id);
 423     if (background_frame) {
 424       int message_id;
 425       args.GetInteger(3, &message_id);
 426       background_frame->Send(new ExtensionHostMsg_EventAck(
 427           background_frame->GetRoutingID(), message_id));
 428     }
 429   }
 430 }
 431
 432 void Dispatcher::ClearPortData(int port_id) {
 433   // Only the target port side has entries in |port_to_tab_id_map_|. If
 434   // |port_id| is a source port, std::map::erase() will just silently fail
 435   // here as a no-op.
 436   port_to_tab_id_map_.erase(port_id);
 437 }
 438
 439 // static
 440 std::vector<std::pair<std::string, int> > Dispatcher::GetJsResources() {
 441   std::vector<std::pair<std::string, int> > resources;
 442
 443   // Libraries.
 444   resources.push_back(std::make_pair("appView", IDR_APP_VIEW_JS));
 445   resources.push_back(std::make_pair("entryIdManager", IDR_ENTRY_ID_MANAGER));
 446   resources.push_back(std::make_pair(kEventBindings, IDR_EVENT_BINDINGS_JS));
 447   resources.push_back(std::make_pair("extensionOptions",
 448                                      IDR_EXTENSION_OPTIONS_JS));
 449   resources.push_back(std::make_pair("extensionOptionsAttributes",
 450                                      IDR_EXTENSION_OPTIONS_ATTRIBUTES_JS));
 451   resources.push_back(std::make_pair("extensionOptionsConstants",
 452                                      IDR_EXTENSION_OPTIONS_CONSTANTS_JS));
 453   resources.push_back(std::make_pair("extensionOptionsEvents",
 454                                      IDR_EXTENSION_OPTIONS_EVENTS_JS));
 455   resources.push_back(std::make_pair("extensionView", IDR_EXTENSION_VIEW_JS));
 456   resources.push_back(std::make_pair("extensionViewApiMethods",
 457                                      IDR_EXTENSION_VIEW_API_METHODS_JS));
 458   resources.push_back(std::make_pair("extensionViewAttributes",
 459                                      IDR_EXTENSION_VIEW_ATTRIBUTES_JS));
 460   resources.push_back(std::make_pair("extensionViewConstants",
 461                                      IDR_EXTENSION_VIEW_CONSTANTS_JS));
 462   resources.push_back(std::make_pair("extensionViewEvents",
 463                                      IDR_EXTENSION_VIEW_EVENTS_JS));
 464   resources.push_back(std::make_pair(
 465       "extensionViewInternal", IDR_EXTENSION_VIEW_INTERNAL_CUSTOM_BINDINGS_JS));
 466   resources.push_back(std::make_pair("guestView", IDR_GUEST_VIEW_JS));
 467   resources.push_back(std::make_pair("guestViewAttributes",
 468                                      IDR_GUEST_VIEW_ATTRIBUTES_JS));
 469   resources.push_back(std::make_pair("guestViewContainer",
 470                                      IDR_GUEST_VIEW_CONTAINER_JS));
 471   resources.push_back(std::make_pair("guestViewDeny", IDR_GUEST_VIEW_DENY_JS));
 472   resources.push_back(std::make_pair("guestViewEvents",
 473                                      IDR_GUEST_VIEW_EVENTS_JS));
 474
 475   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 476           ::switches::kSitePerProcess)) {
 477     resources.push_back(std::make_pair("guestViewIframe",
 478                                        IDR_GUEST_VIEW_IFRAME_JS));
 479     resources.push_back(std::make_pair("guestViewIframeContainer",
 480                                        IDR_GUEST_VIEW_IFRAME_CONTAINER_JS));
 481   }
 482
 483   resources.push_back(std::make_pair("imageUtil", IDR_IMAGE_UTIL_JS));
 484   resources.push_back(std::make_pair("json_schema", IDR_JSON_SCHEMA_JS));
 485   resources.push_back(std::make_pair("lastError", IDR_LAST_ERROR_JS));
 486   resources.push_back(std::make_pair("messaging", IDR_MESSAGING_JS));
 487   resources.push_back(std::make_pair("messaging_utils",
 488                                      IDR_MESSAGING_UTILS_JS));
 489   resources.push_back(std::make_pair(kSchemaUtils, IDR_SCHEMA_UTILS_JS));
 490   resources.push_back(std::make_pair("sendRequest", IDR_SEND_REQUEST_JS));
 491   resources.push_back(std::make_pair("setIcon", IDR_SET_ICON_JS));
 492   resources.push_back(std::make_pair("surfaceWorker", IDR_SURFACE_VIEW_JS));
 493   resources.push_back(std::make_pair("test", IDR_TEST_CUSTOM_BINDINGS_JS));
 494   resources.push_back(
 495       std::make_pair("test_environment_specific_bindings",
 496                      IDR_BROWSER_TEST_ENVIRONMENT_SPECIFIC_BINDINGS_JS));
 497   resources.push_back(std::make_pair("uncaught_exception_handler",
 498                                      IDR_UNCAUGHT_EXCEPTION_HANDLER_JS));
 499   resources.push_back(std::make_pair("unload_event", IDR_UNLOAD_EVENT_JS));
 500   resources.push_back(std::make_pair("utils", IDR_UTILS_JS));
 501   resources.push_back(std::make_pair("webRequest",
 502                                      IDR_WEB_REQUEST_CUSTOM_BINDINGS_JS));
 503   resources.push_back(
 504        std::make_pair("webRequestInternal",
 505                       IDR_WEB_REQUEST_INTERNAL_CUSTOM_BINDINGS_JS));
 506   // Note: webView not webview so that this doesn't interfere with the
 507   // chrome.webview API bindings.
 508   resources.push_back(std::make_pair("webView", IDR_WEB_VIEW_JS));
 509   resources.push_back(std::make_pair("webViewActionRequests",
 510                                      IDR_WEB_VIEW_ACTION_REQUESTS_JS));
 511   resources.push_back(std::make_pair("webViewApiMethods",
 512                                      IDR_WEB_VIEW_API_METHODS_JS));
 513   resources.push_back(std::make_pair("webViewAttributes",
 514                                      IDR_WEB_VIEW_ATTRIBUTES_JS));
 515   resources.push_back(std::make_pair("webViewConstants",
 516                                      IDR_WEB_VIEW_CONSTANTS_JS));
 517   resources.push_back(std::make_pair("webViewEvents", IDR_WEB_VIEW_EVENTS_JS));
 518   resources.push_back(std::make_pair("webViewInternal",
 519                                      IDR_WEB_VIEW_INTERNAL_CUSTOM_BINDINGS_JS));
 520   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 521           ::switches::kSitePerProcess)) {
 522     resources.push_back(std::make_pair("webViewIframe",
 523                                        IDR_WEB_VIEW_IFRAME_JS));
 524   }
 525   resources.push_back(
 526       std::make_pair(mojo::kBindingsModuleName, IDR_MOJO_BINDINGS_JS));
 527   resources.push_back(
 528       std::make_pair(mojo::kBufferModuleName, IDR_MOJO_BUFFER_JS));
 529   resources.push_back(
 530       std::make_pair(mojo::kCodecModuleName, IDR_MOJO_CODEC_JS));
 531   resources.push_back(
 532       std::make_pair(mojo::kConnectionModuleName, IDR_MOJO_CONNECTION_JS));
 533   resources.push_back(
 534       std::make_pair(mojo::kConnectorModuleName, IDR_MOJO_CONNECTOR_JS));
 535   resources.push_back(
 536       std::make_pair(mojo::kRouterModuleName, IDR_MOJO_ROUTER_JS));
 537   resources.push_back(
 538       std::make_pair(mojo::kUnicodeModuleName, IDR_MOJO_UNICODE_JS));
 539   resources.push_back(
 540       std::make_pair(mojo::kValidatorModuleName, IDR_MOJO_VALIDATOR_JS));
 541   resources.push_back(std::make_pair("async_waiter", IDR_ASYNC_WAITER_JS));
 542   resources.push_back(std::make_pair("data_receiver", IDR_DATA_RECEIVER_JS));
 543   resources.push_back(std::make_pair("data_sender", IDR_DATA_SENDER_JS));
 544   resources.push_back(std::make_pair("keep_alive", IDR_KEEP_ALIVE_JS));
 545   resources.push_back(std::make_pair("extensions/common/mojo/keep_alive.mojom",
 546                                      IDR_KEEP_ALIVE_MOJOM_JS));
 547   resources.push_back(std::make_pair("device/serial/data_stream.mojom",
 548                                      IDR_DATA_STREAM_MOJOM_JS));
 549   resources.push_back(
 550       std::make_pair("device/serial/data_stream_serialization.mojom",
 551                      IDR_DATA_STREAM_SERIALIZATION_MOJOM_JS));
 552   resources.push_back(std::make_pair("stash_client", IDR_STASH_CLIENT_JS));
 553   resources.push_back(
 554       std::make_pair("extensions/common/mojo/stash.mojom", IDR_STASH_MOJOM_JS));
 555
 556   // Custom bindings.
 557   resources.push_back(
 558       std::make_pair("app.runtime", IDR_APP_RUNTIME_CUSTOM_BINDINGS_JS));
 559   resources.push_back(
 560       std::make_pair("app.window", IDR_APP_WINDOW_CUSTOM_BINDINGS_JS));
 561   resources.push_back(
 562       std::make_pair("declarativeWebRequest",
 563                      IDR_DECLARATIVE_WEBREQUEST_CUSTOM_BINDINGS_JS));
 564   resources.push_back(
 565       std::make_pair("contextMenus", IDR_CONTEXT_MENUS_CUSTOM_BINDINGS_JS));
 566   resources.push_back(
 567       std::make_pair("contextMenusHandlers", IDR_CONTEXT_MENUS_HANDLERS_JS));
 568   resources.push_back(
 569       std::make_pair("extension", IDR_EXTENSION_CUSTOM_BINDINGS_JS));
 570   resources.push_back(std::make_pair("i18n", IDR_I18N_CUSTOM_BINDINGS_JS));
 571   resources.push_back(std::make_pair(
 572       "mimeHandlerPrivate", IDR_MIME_HANDLER_PRIVATE_CUSTOM_BINDINGS_JS));
 573   resources.push_back(std::make_pair("extensions/common/api/mime_handler.mojom",
 574                                      IDR_MIME_HANDLER_MOJOM_JS));
 575   resources.push_back(
 576       std::make_pair("mojoPrivate", IDR_MOJO_PRIVATE_CUSTOM_BINDINGS_JS));
 577   resources.push_back(
 578       std::make_pair("permissions", IDR_PERMISSIONS_CUSTOM_BINDINGS_JS));
 579   resources.push_back(std::make_pair("printerProvider",
 580                                      IDR_PRINTER_PROVIDER_CUSTOM_BINDINGS_JS));
 581   resources.push_back(
 582       std::make_pair("runtime", IDR_RUNTIME_CUSTOM_BINDINGS_JS));
 583   resources.push_back(std::make_pair("windowControls", IDR_WINDOW_CONTROLS_JS));
 584   resources.push_back(
 585       std::make_pair("webViewRequest",
 586                      IDR_WEB_VIEW_REQUEST_CUSTOM_BINDINGS_JS));
 587   resources.push_back(std::make_pair("binding", IDR_BINDING_JS));
 588
 589   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 590           switches::kEnableMojoSerialService)) {
 591     resources.push_back(
 592         std::make_pair("serial", IDR_SERIAL_CUSTOM_BINDINGS_JS));
 593   }
 594   resources.push_back(std::make_pair("serial_service", IDR_SERIAL_SERVICE_JS));
 595   resources.push_back(
 596       std::make_pair("device/serial/serial.mojom", IDR_SERIAL_MOJOM_JS));
 597   resources.push_back(std::make_pair("device/serial/serial_serialization.mojom",
 598                                      IDR_SERIAL_SERIALIZATION_MOJOM_JS));
 599
 600   // Custom types sources.
 601   resources.push_back(std::make_pair("StorageArea", IDR_STORAGE_AREA_JS));
 602
 603   // Platform app sources that are not API-specific..
 604   resources.push_back(std::make_pair("platformApp", IDR_PLATFORM_APP_JS));
 605
 606 #if defined(ENABLE_MEDIA_ROUTER)
 607   resources.push_back(
 608       std::make_pair("chrome/browser/media/router/media_router.mojom",
 609                      IDR_MEDIA_ROUTER_MOJOM_JS));
 610   resources.push_back(
 611       std::make_pair("media_router_bindings", IDR_MEDIA_ROUTER_BINDINGS_JS));
 612 #endif  // defined(ENABLE_MEDIA_ROUTER)
 613
 614   return resources;
 615 }
 616
 617 // NOTE: please use the naming convention "foo_natives" for these.
 618 // static
 619 void Dispatcher::RegisterNativeHandlers(ModuleSystem* module_system,
 620                                         ScriptContext* context,
 621                                         Dispatcher* dispatcher,
 622                                         RequestSender* request_sender,
 623                                         V8SchemaRegistry* v8_schema_registry) {
 624   module_system->RegisterNativeHandler(
 625       "chrome", scoped_ptr<NativeHandler>(new ChromeNativeHandler(context)));
 626   module_system->RegisterNativeHandler(
 627       "lazy_background_page",
 628       scoped_ptr<NativeHandler>(new LazyBackgroundPageNativeHandler(context)));
 629   module_system->RegisterNativeHandler(
 630       "logging", scoped_ptr<NativeHandler>(new LoggingNativeHandler(context)));
 631   module_system->RegisterNativeHandler("schema_registry",
 632                                        v8_schema_registry->AsNativeHandler());
 633   module_system->RegisterNativeHandler(
 634       "print", scoped_ptr<NativeHandler>(new PrintNativeHandler(context)));
 635   module_system->RegisterNativeHandler(
 636       "test_features",
 637       scoped_ptr<NativeHandler>(new TestFeaturesNativeHandler(context)));
 638   module_system->RegisterNativeHandler(
 639       "user_gestures",
 640       scoped_ptr<NativeHandler>(new UserGesturesNativeHandler(context)));
 641   module_system->RegisterNativeHandler(
 642       "utils", scoped_ptr<NativeHandler>(new UtilsNativeHandler(context)));
 643   module_system->RegisterNativeHandler(
 644       "v8_context",
 645       scoped_ptr<NativeHandler>(
 646           new V8ContextNativeHandler(context, dispatcher)));
 647   module_system->RegisterNativeHandler(
 648       "event_natives", scoped_ptr<NativeHandler>(new EventBindings(context)));
 649   module_system->RegisterNativeHandler(
 650       "messaging_natives",
 651       scoped_ptr<NativeHandler>(MessagingBindings::Get(dispatcher, context)));
 652   module_system->RegisterNativeHandler(
 653       "apiDefinitions",
 654       scoped_ptr<NativeHandler>(
 655           new ApiDefinitionsNatives(dispatcher, context)));
 656   module_system->RegisterNativeHandler(
 657       "sendRequest",
 658       scoped_ptr<NativeHandler>(
 659           new SendRequestNatives(request_sender, context)));
 660   module_system->RegisterNativeHandler(
 661       "setIcon",
 662       scoped_ptr<NativeHandler>(new SetIconNatives(context)));
 663   module_system->RegisterNativeHandler(
 664       "activityLogger",
 665       scoped_ptr<NativeHandler>(new APIActivityLogger(context)));
 666   module_system->RegisterNativeHandler(
 667       "renderFrameObserverNatives",
 668       scoped_ptr<NativeHandler>(new RenderFrameObserverNatives(context)));
 669
 670   // Natives used by multiple APIs.
 671   module_system->RegisterNativeHandler(
 672       "file_system_natives",
 673       scoped_ptr<NativeHandler>(new FileSystemNatives(context)));
 674
 675   // Custom bindings.
 676   module_system->RegisterNativeHandler(
 677       "app_runtime",
 678       scoped_ptr<NativeHandler>(new AppRuntimeCustomBindings(context)));
 679   // |dispatcher| is null in unit tests.
 680   const ScriptContextSet* script_context_set = dispatcher ?
 681       &dispatcher->script_context_set() : nullptr;
 682   module_system->RegisterNativeHandler(
 683       "app_window_natives",
 684       scoped_ptr<NativeHandler>(new AppWindowCustomBindings(
 685           script_context_set, context)));
 686   module_system->RegisterNativeHandler(
 687       "blob_natives",
 688       scoped_ptr<NativeHandler>(new BlobNativeHandler(context)));
 689   module_system->RegisterNativeHandler(
 690       "context_menus",
 691       scoped_ptr<NativeHandler>(new ContextMenusCustomBindings(context)));
 692   module_system->RegisterNativeHandler(
 693       "css_natives", scoped_ptr<NativeHandler>(new CssNativeHandler(context)));
 694   module_system->RegisterNativeHandler(
 695       "document_natives",
 696       scoped_ptr<NativeHandler>(new DocumentCustomBindings(context)));
 697   module_system->RegisterNativeHandler(
 698       "guest_view_internal",
 699       scoped_ptr<NativeHandler>(
 700           new GuestViewInternalCustomBindings(context)));
 701   module_system->RegisterNativeHandler(
 702       "i18n", scoped_ptr<NativeHandler>(new I18NCustomBindings(context)));
 703   module_system->RegisterNativeHandler(
 704       "id_generator",
 705       scoped_ptr<NativeHandler>(new IdGeneratorCustomBindings(context)));
 706   module_system->RegisterNativeHandler(
 707       "runtime", scoped_ptr<NativeHandler>(new RuntimeCustomBindings(context)));
 708 }
 709
 710 void Dispatcher::LoadExtensionForTest(const Extension* extension) {
 711   CHECK(extensions_.Insert(extension));
 712 }
 713
 714 bool Dispatcher::OnControlMessageReceived(const IPC::Message& message) {
 715   bool handled = true;
 716   IPC_BEGIN_MESSAGE_MAP(Dispatcher, message)
 717   IPC_MESSAGE_HANDLER(ExtensionMsg_ActivateExtension, OnActivateExtension)
 718   IPC_MESSAGE_HANDLER(ExtensionMsg_CancelSuspend, OnCancelSuspend)
 719   IPC_MESSAGE_HANDLER(ExtensionMsg_DeliverMessage, OnDeliverMessage)
 720   IPC_MESSAGE_HANDLER(ExtensionMsg_DispatchOnConnect, OnDispatchOnConnect)
 721   IPC_MESSAGE_HANDLER(ExtensionMsg_DispatchOnDisconnect, OnDispatchOnDisconnect)
 722   IPC_MESSAGE_HANDLER(ExtensionMsg_Loaded, OnLoaded)
 723   IPC_MESSAGE_HANDLER(ExtensionMsg_MessageInvoke, OnMessageInvoke)
 724   IPC_MESSAGE_HANDLER(ExtensionMsg_SetChannel, OnSetChannel)
 725   IPC_MESSAGE_HANDLER(ExtensionMsg_SetFunctionNames, OnSetFunctionNames)
 726   IPC_MESSAGE_HANDLER(ExtensionMsg_SetScriptingWhitelist,
 727                       OnSetScriptingWhitelist)
 728   IPC_MESSAGE_HANDLER(ExtensionMsg_SetSystemFont, OnSetSystemFont)
 729   IPC_MESSAGE_HANDLER(ExtensionMsg_ShouldSuspend, OnShouldSuspend)
 730   IPC_MESSAGE_HANDLER(ExtensionMsg_Suspend, OnSuspend)
 731   IPC_MESSAGE_HANDLER(ExtensionMsg_TransferBlobs, OnTransferBlobs)
 732   IPC_MESSAGE_HANDLER(ExtensionMsg_Unloaded, OnUnloaded)
 733   IPC_MESSAGE_HANDLER(ExtensionMsg_UpdatePermissions, OnUpdatePermissions)
 734   IPC_MESSAGE_HANDLER(ExtensionMsg_UpdateTabSpecificPermissions,
 735                       OnUpdateTabSpecificPermissions)
 736   IPC_MESSAGE_HANDLER(ExtensionMsg_ClearTabSpecificPermissions,
 737                       OnClearTabSpecificPermissions)
 738   IPC_MESSAGE_HANDLER(ExtensionMsg_UsingWebRequestAPI, OnUsingWebRequestAPI)
 739   IPC_MESSAGE_FORWARD(ExtensionMsg_WatchPages,
 740                       content_watcher_.get(),
 741                       ContentWatcher::OnWatchPages)
 742   IPC_MESSAGE_UNHANDLED(handled = false)
 743   IPC_END_MESSAGE_MAP()
 744
 745   return handled;
 746 }
 747
 748 void Dispatcher::WebKitInitialized() {
 749   // For extensions, we want to ensure we call the IdleHandler every so often,
 750   // even if the extension keeps up activity.
 751   if (set_idle_notifications_) {
 752     forced_idle_timer_.reset(new base::RepeatingTimer<content::RenderThread>);
 753     forced_idle_timer_->Start(
 754         FROM_HERE,
 755         base::TimeDelta::FromMilliseconds(kMaxExtensionIdleHandlerDelayMs),
 756         RenderThread::Get(),
 757         &RenderThread::IdleHandler);
 758   }
 759
 760   // Initialize host permissions for any extensions that were activated before
 761   // WebKit was initialized.
 762   for (const std::string& extension_id : active_extension_ids_) {
 763     const Extension* extension = extensions_.GetByID(extension_id);
 764     CHECK(extension);
 765     InitOriginPermissions(extension);
 766   }
 767
 768   EnableCustomElementWhiteList();
 769
 770   is_webkit_initialized_ = true;
 771 }
 772
 773 void Dispatcher::IdleNotification() {
 774   if (set_idle_notifications_ && forced_idle_timer_) {
 775     // Dampen the forced delay as well if the extension stays idle for long
 776     // periods of time. (forced_idle_timer_ can be NULL after
 777     // OnRenderProcessShutdown has been called.)
 778     int64 forced_delay_ms =
 779         std::max(RenderThread::Get()->GetIdleNotificationDelayInMs(),
 780                  kMaxExtensionIdleHandlerDelayMs);
 781     forced_idle_timer_->Stop();
 782     forced_idle_timer_->Start(
 783         FROM_HERE,
 784         base::TimeDelta::FromMilliseconds(forced_delay_ms),
 785         RenderThread::Get(),
 786         &RenderThread::IdleHandler);
 787   }
 788 }
 789
 790 void Dispatcher::OnRenderProcessShutdown() {
 791   v8_schema_registry_.reset();
 792   forced_idle_timer_.reset();
 793   content_watcher_.reset();
 794 }
 795
 796 void Dispatcher::OnActivateExtension(const std::string& extension_id) {
 797   const Extension* extension = extensions_.GetByID(extension_id);
 798   if (!extension) {
 799     // Extension was activated but was never loaded. This probably means that
 800     // the renderer failed to load it (or the browser failed to tell us when it
 801     // did). Failures shouldn't happen, but instead of crashing there (which
 802     // executes on all renderers) be conservative and only crash in the renderer
 803     // of the extension which failed to load; this one.
 804     std::string& error = extension_load_errors_[extension_id];
 805     char minidump[256];
 806     base::debug::Alias(&minidump);
 807     base::snprintf(minidump,
 808                    arraysize(minidump),
 809                    "e::dispatcher:%s:%s",
 810                    extension_id.c_str(),
 811                    error.c_str());
 812     LOG(FATAL) << extension_id << " was never loaded: " << error;
 813   }
 814
 815   active_extension_ids_.insert(extension_id);
 816
 817   // This is called when starting a new extension page, so start the idle
 818   // handler ticking.
 819   RenderThread::Get()->ScheduleIdleHandler(kInitialExtensionIdleHandlerDelayMs);
 820
 821   if (is_webkit_initialized_) {
 822     DOMActivityLogger::AttachToWorld(
 823         DOMActivityLogger::kMainWorldId, extension_id);
 824
 825     InitOriginPermissions(extension);
 826   }
 827
 828   UpdateActiveExtensions();
 829 }
 830
 831 void Dispatcher::OnCancelSuspend(const std::string& extension_id) {
 832   DispatchEvent(extension_id, kOnSuspendCanceledEvent);
 833 }
 834
 835 void Dispatcher::OnDeliverMessage(int target_port_id, const Message& message) {
 836   scoped_ptr<RequestSender::ScopedTabID> scoped_tab_id;
 837   std::map<int, int>::const_iterator it =
 838       port_to_tab_id_map_.find(target_port_id);
 839   if (it != port_to_tab_id_map_.end()) {
 840     scoped_tab_id.reset(
 841         new RequestSender::ScopedTabID(request_sender(), it->second));
 842   }
 843
 844   MessagingBindings::DeliverMessage(*script_context_set_, target_port_id,
 845                                     message,
 846                                     NULL);  // All render frames.
 847 }
 848
 849 void Dispatcher::OnDispatchOnConnect(
 850     int target_port_id,
 851     const std::string& channel_name,
 852     const ExtensionMsg_TabConnectionInfo& source,
 853     const ExtensionMsg_ExternalConnectionInfo& info,
 854     const std::string& tls_channel_id) {
 855   DCHECK(!ContainsKey(port_to_tab_id_map_, target_port_id));
 856   DCHECK_EQ(1, target_port_id % 2);  // target renderer ports have odd IDs.
 857   int sender_tab_id = -1;
 858   source.tab.GetInteger("id", &sender_tab_id);
 859   port_to_tab_id_map_[target_port_id] = sender_tab_id;
 860
 861   MessagingBindings::DispatchOnConnect(*script_context_set_, target_port_id,
 862                                        channel_name, source, info,
 863                                        tls_channel_id,
 864                                        NULL);  // All render frames.
 865 }
 866
 867 void Dispatcher::OnDispatchOnDisconnect(int port_id,
 868                                         const std::string& error_message) {
 869   MessagingBindings::DispatchOnDisconnect(*script_context_set_, port_id,
 870                                           error_message,
 871                                           NULL);  // All render frames.
 872 }
 873
 874 void Dispatcher::OnLoaded(
 875     const std::vector<ExtensionMsg_Loaded_Params>& loaded_extensions) {
 876   for (const auto& param : loaded_extensions) {
 877     std::string error;
 878     scoped_refptr<const Extension> extension = param.ConvertToExtension(&error);
 879     if (!extension.get()) {
 880       NOTREACHED() << error;
 881       // Note: in tests |param.id| has been observed to be empty (see comment
 882       // just below) so this isn't all that reliable.
 883       extension_load_errors_[param.id] = error;
 884       continue;
 885     }
 886
 887     // TODO(kalman): This test is deliberately not a CHECK (though I wish it
 888     // could be) and uses extension->id() not params.id:
 889     // 1. For some reason params.id can be empty. I've only seen it with
 890     //    the webstore extension, in tests, and I've spent some time trying to
 891     //    figure out why - but cost/benefit won.
 892     // 2. The browser only sends this IPC to RenderProcessHosts once, but the
 893     //    Dispatcher is attached to a RenderThread. Presumably there is a
 894     //    mismatch there. In theory one would think it's possible for the
 895     //    browser to figure this out itself - but again, cost/benefit.
 896     if (!extensions_.Contains(extension->id()))
 897       extensions_.Insert(extension);
 898   }
 899
 900   // Update the available bindings for all contexts. These may have changed if
 901   // an externally_connectable extension was loaded that can connect to an
 902   // open webpage.
 903   UpdateBindings("");
 904 }
 905
 906 void Dispatcher::OnMessageInvoke(const std::string& extension_id,
 907                                  const std::string& module_name,
 908                                  const std::string& function_name,
 909                                  const base::ListValue& args,
 910                                  bool user_gesture) {
 911   InvokeModuleSystemMethod(
 912       NULL, extension_id, module_name, function_name, args, user_gesture);
 913 }
 914
 915 void Dispatcher::OnSetChannel(int channel) {
 916   delegate_->SetChannel(channel);
 917   AddChannelSpecificFeatures();
 918 }
 919
 920 void Dispatcher::OnSetFunctionNames(const std::vector<std::string>& names) {
 921   function_names_.clear();
 922   for (size_t i = 0; i < names.size(); ++i)
 923     function_names_.insert(names[i]);
 924 }
 925
 926 void Dispatcher::OnSetScriptingWhitelist(
 927     const ExtensionsClient::ScriptingWhitelist& extension_ids) {
 928   ExtensionsClient::Get()->SetScriptingWhitelist(extension_ids);
 929 }
 930
 931 void Dispatcher::OnSetSystemFont(const std::string& font_family,
 932                                  const std::string& font_size) {
 933   system_font_family_ = font_family;
 934   system_font_size_ = font_size;
 935 }
 936
 937 void Dispatcher::OnShouldSuspend(const std::string& extension_id,
 938                                  uint64 sequence_id) {
 939   RenderThread::Get()->Send(
 940       new ExtensionHostMsg_ShouldSuspendAck(extension_id, sequence_id));
 941 }
 942
 943 void Dispatcher::OnSuspend(const std::string& extension_id) {
 944   // Dispatch the suspend event. This doesn't go through the standard event
 945   // dispatch machinery because it requires special handling. We need to let
 946   // the browser know when we are starting and stopping the event dispatch, so
 947   // that it still considers the extension idle despite any activity the suspend
 948   // event creates.
 949   DispatchEvent(extension_id, kOnSuspendEvent);
 950   RenderThread::Get()->Send(new ExtensionHostMsg_SuspendAck(extension_id));
 951 }
 952
 953 void Dispatcher::OnTransferBlobs(const std::vector<std::string>& blob_uuids) {
 954   RenderThread::Get()->Send(new ExtensionHostMsg_TransferBlobsAck(blob_uuids));
 955 }
 956
 957 void Dispatcher::OnUnloaded(const std::string& id) {
 958   // See comment in OnLoaded for why it would be nice, but perhaps incorrect,
 959   // to CHECK here rather than guarding.
 960   if (!extensions_.Remove(id))
 961     return;
 962
 963   active_extension_ids_.erase(id);
 964
 965   script_injection_manager_->OnExtensionUnloaded(id);
 966
 967   // If the extension is later reloaded with a different set of permissions,
 968   // we'd like it to get a new isolated world ID, so that it can pick up the
 969   // changed origin whitelist.
 970   ScriptInjection::RemoveIsolatedWorld(id);
 971
 972   // Invalidate all of the contexts that were removed.
 973   // TODO(kalman): add an invalidation observer interface to ScriptContext.
 974   std::set<ScriptContext*> removed_contexts =
 975       script_context_set_->OnExtensionUnloaded(id);
 976   for (ScriptContext* context : removed_contexts) {
 977     request_sender_->InvalidateSource(context);
 978   }
 979
 980   // Update the available bindings for the remaining contexts. These may have
 981   // changed if an externally_connectable extension is unloaded and a webpage
 982   // is no longer accessible.
 983   UpdateBindings("");
 984
 985   // Invalidates the messages map for the extension in case the extension is
 986   // reloaded with a new messages map.
 987   EraseL10nMessagesMap(id);
 988
 989   // We don't do anything with existing platform-app stylesheets. They will
 990   // stay resident, but the URL pattern corresponding to the unloaded
 991   // extension's URL just won't match anything anymore.
 992 }
 993
 994 void Dispatcher::OnUpdatePermissions(
 995     const ExtensionMsg_UpdatePermissions_Params& params) {
 996   const Extension* extension = extensions_.GetByID(params.extension_id);
 997   if (!extension)
 998     return;
 999
1000   scoped_refptr<const PermissionSet> active =
1001       params.active_permissions.ToPermissionSet();
1002   scoped_refptr<const PermissionSet> withheld =
1003       params.withheld_permissions.ToPermissionSet();
1004
1005   if (is_webkit_initialized_) {
1006     UpdateOriginPermissions(
1007         extension->url(),
1008         extension->permissions_data()->GetEffectiveHostPermissions(),
1009         active->effective_hosts());
1010   }
1011
1012   extension->permissions_data()->SetPermissions(active, withheld);
1013   UpdateBindings(extension->id());
1014 }
1015
1016 void Dispatcher::OnUpdateTabSpecificPermissions(const GURL& visible_url,
1017                                                 const std::string& extension_id,
1018                                                 const URLPatternSet& new_hosts,
1019                                                 bool update_origin_whitelist,
1020                                                 int tab_id) {
1021   const Extension* extension = extensions_.GetByID(extension_id);
1022   if (!extension)
1023     return;
1024
1025   URLPatternSet old_effective =
1026       extension->permissions_data()->GetEffectiveHostPermissions();
1027   extension->permissions_data()->UpdateTabSpecificPermissions(
1028       tab_id,
1029       new extensions::PermissionSet(extensions::APIPermissionSet(),
1030                                     extensions::ManifestPermissionSet(),
1031                                     new_hosts,
1032                                     extensions::URLPatternSet()));
1033
1034   if (is_webkit_initialized_ && update_origin_whitelist) {
1035     UpdateOriginPermissions(
1036         extension->url(),
1037         old_effective,
1038         extension->permissions_data()->GetEffectiveHostPermissions());
1039   }
1040 }
1041
1042 void Dispatcher::OnClearTabSpecificPermissions(
1043     const std::vector<std::string>& extension_ids,
1044     bool update_origin_whitelist,
1045     int tab_id) {
1046   for (const std::string& id : extension_ids) {
1047     const Extension* extension = extensions_.GetByID(id);
1048     if (extension) {
1049       URLPatternSet old_effective =
1050           extension->permissions_data()->GetEffectiveHostPermissions();
1051       extension->permissions_data()->ClearTabSpecificPermissions(tab_id);
1052       if (is_webkit_initialized_ && update_origin_whitelist) {
1053         UpdateOriginPermissions(
1054             extension->url(),
1055             old_effective,
1056             extension->permissions_data()->GetEffectiveHostPermissions());
1057       }
1058     }
1059   }
1060 }
1061
1062 void Dispatcher::OnUsingWebRequestAPI(bool webrequest_used) {
1063   webrequest_used_ = webrequest_used;
1064 }
1065
1066 void Dispatcher::OnUserScriptsUpdated(const std::set<HostID>& changed_hosts,
1067                                       const std::vector<UserScript*>& scripts) {
1068   UpdateActiveExtensions();
1069 }
1070
1071 void Dispatcher::UpdateActiveExtensions() {
1072   std::set<std::string> active_extensions = active_extension_ids_;
1073   user_script_set_manager_->GetAllActiveExtensionIds(&active_extensions);
1074   delegate_->OnActiveExtensionsUpdated(active_extensions);
1075 }
1076
1077 void Dispatcher::InitOriginPermissions(const Extension* extension) {
1078   delegate_->InitOriginPermissions(extension,
1079                                    IsExtensionActive(extension->id()));
1080   UpdateOriginPermissions(
1081       extension->url(),
1082       URLPatternSet(),  // No old permissions.
1083       extension->permissions_data()->GetEffectiveHostPermissions());
1084 }
1085
1086 void Dispatcher::UpdateOriginPermissions(const GURL& extension_url,
1087                                          const URLPatternSet& old_patterns,
1088                                          const URLPatternSet& new_patterns) {
1089   static const char* kSchemes[] = {
1090     url::kHttpScheme,
1091     url::kHttpsScheme,
1092     url::kFileScheme,
1093     content::kChromeUIScheme,
1094     url::kFtpScheme,
1095 #if defined(OS_CHROMEOS)
1096     content::kExternalFileScheme,
1097 #endif
1098     extensions::kExtensionScheme,
1099   };
1100   for (size_t i = 0; i < arraysize(kSchemes); ++i) {
1101     const char* scheme = kSchemes[i];
1102     // Remove all old patterns...
1103     for (URLPatternSet::const_iterator pattern = old_patterns.begin();
1104          pattern != old_patterns.end(); ++pattern) {
1105       if (pattern->MatchesScheme(scheme)) {
1106         WebSecurityPolicy::removeOriginAccessWhitelistEntry(
1107             extension_url,
1108             WebString::fromUTF8(scheme),
1109             WebString::fromUTF8(pattern->host()),
1110             pattern->match_subdomains());
1111       }
1112     }
1113     // ...And add the new ones.
1114     for (URLPatternSet::const_iterator pattern = new_patterns.begin();
1115          pattern != new_patterns.end(); ++pattern) {
1116       if (pattern->MatchesScheme(scheme)) {
1117         WebSecurityPolicy::addOriginAccessWhitelistEntry(
1118             extension_url,
1119             WebString::fromUTF8(scheme),
1120             WebString::fromUTF8(pattern->host()),
1121             pattern->match_subdomains());
1122       }
1123     }
1124   }
1125 }
1126
1127 void Dispatcher::EnableCustomElementWhiteList() {
1128   blink::WebCustomElement::addEmbedderCustomElementName("appview");
1129   blink::WebCustomElement::addEmbedderCustomElementName("appviewbrowserplugin");
1130   blink::WebCustomElement::addEmbedderCustomElementName("extensionoptions");
1131   blink::WebCustomElement::addEmbedderCustomElementName(
1132       "extensionoptionsbrowserplugin");
1133   blink::WebCustomElement::addEmbedderCustomElementName("extensionview");
1134   blink::WebCustomElement::addEmbedderCustomElementName(
1135       "extensionviewbrowserplugin");
1136   blink::WebCustomElement::addEmbedderCustomElementName("webview");
1137   blink::WebCustomElement::addEmbedderCustomElementName("webviewbrowserplugin");
1138   blink::WebCustomElement::addEmbedderCustomElementName("surfaceview");
1139   blink::WebCustomElement::addEmbedderCustomElementName(
1140       "surfaceviewbrowserplugin");
1141 }
1142
1143 void Dispatcher::UpdateBindings(const std::string& extension_id) {
1144   script_context_set().ForEach(extension_id,
1145                                base::Bind(&Dispatcher::UpdateBindingsForContext,
1146                                           base::Unretained(this)));
1147 }
1148
1149 void Dispatcher::UpdateBindingsForContext(ScriptContext* context) {
1150   v8::HandleScope handle_scope(context->isolate());
1151   v8::Context::Scope context_scope(context->v8_context());
1152
1153   // TODO(kalman): Make the bindings registration have zero overhead then run
1154   // the same code regardless of context type.
1155   switch (context->context_type()) {
1156     case Feature::UNSPECIFIED_CONTEXT:
1157     case Feature::WEB_PAGE_CONTEXT:
1158     case Feature::BLESSED_WEB_PAGE_CONTEXT:
1159       // Web page context; it's too expensive to run the full bindings code.
1160       // Hard-code that the app and webstore APIs are available...
1161       if (context->GetAvailability("app").is_available())
1162         RegisterBinding("app", context);
1163       if (context->GetAvailability("webstore").is_available())
1164         RegisterBinding("webstore", context);
1165       if (IsRuntimeAvailableToContext(context))
1166         RegisterBinding("runtime", context);
1167       UpdateContentCapabilities(context);
1168       break;
1169
1170     case Feature::BLESSED_EXTENSION_CONTEXT:
1171     case Feature::UNBLESSED_EXTENSION_CONTEXT:
1172     case Feature::CONTENT_SCRIPT_CONTEXT:
1173     case Feature::WEBUI_CONTEXT: {
1174       // Extension context; iterate through all the APIs and bind the available
1175       // ones.
1176       const FeatureProvider* api_feature_provider =
1177           FeatureProvider::GetAPIFeatures();
1178       const std::vector<std::string>& apis =
1179           api_feature_provider->GetAllFeatureNames();
1180       for (std::vector<std::string>::const_iterator it = apis.begin();
1181            it != apis.end();
1182            ++it) {
1183         const std::string& api_name = *it;
1184         Feature* feature = api_feature_provider->GetFeature(api_name);
1185         DCHECK(feature);
1186
1187         // Internal APIs are included via require(api_name) from internal code
1188         // rather than chrome[api_name].
1189         if (feature->IsInternal())
1190           continue;
1191
1192         // If this API has a parent feature (and isn't marked 'noparent'),
1193         // then this must be a function or event, so we should not register.
1194         if (api_feature_provider->GetParent(feature) != NULL)
1195           continue;
1196
1197         // Skip chrome.test if this isn't a test.
1198         if (api_name == "test" &&
1199             !base::CommandLine::ForCurrentProcess()->HasSwitch(
1200                 ::switches::kTestType)) {
1201           continue;
1202         }
1203
1204         if (context->IsAnyFeatureAvailableToContext(*feature))
1205           RegisterBinding(api_name, context);
1206       }
1207       break;
1208     }
1209   }
1210 }
1211
1212 void Dispatcher::RegisterBinding(const std::string& api_name,
1213                                  ScriptContext* context) {
1214   std::string bind_name;
1215   v8::Local<v8::Object> bind_object =
1216       GetOrCreateBindObjectIfAvailable(api_name, &bind_name, context);
1217
1218   // Empty if the bind object failed to be created, probably because the
1219   // extension overrode chrome with a non-object, e.g. window.chrome = true.
1220   if (bind_object.IsEmpty())
1221     return;
1222
1223   v8::Local<v8::String> v8_bind_name =
1224       v8::String::NewFromUtf8(context->isolate(), bind_name.c_str());
1225   if (bind_object->HasRealNamedProperty(v8_bind_name)) {
1226     // The bind object may already have the property if the API has been
1227     // registered before (or if the extension has put something there already,
1228     // but, whatevs).
1229     //
1230     // In the former case, we need to re-register the bindings for the APIs
1231     // which the extension now has permissions for (if any), but not touch any
1232     // others so that we don't destroy state such as event listeners.
1233     //
1234     // TODO(kalman): Only register available APIs to make this all moot.
1235     if (bind_object->HasRealNamedCallbackProperty(v8_bind_name))
1236       return;  // lazy binding still there, nothing to do
1237     if (bind_object->Get(v8_bind_name)->IsObject())
1238       return;  // binding has already been fully installed
1239   }
1240
1241   ModuleSystem* module_system = context->module_system();
1242   if (!source_map_.Contains(api_name)) {
1243     module_system->RegisterNativeHandler(
1244         api_name,
1245         scoped_ptr<NativeHandler>(new BindingGeneratingNativeHandler(
1246             context, api_name, "binding")));
1247     module_system->SetNativeLazyField(
1248         bind_object, bind_name, api_name, "binding");
1249   } else {
1250     module_system->SetLazyField(bind_object, bind_name, api_name, "binding");
1251   }
1252 }
1253
1254 // NOTE: please use the naming convention "foo_natives" for these.
1255 void Dispatcher::RegisterNativeHandlers(ModuleSystem* module_system,
1256                                         ScriptContext* context) {
1257   RegisterNativeHandlers(module_system,
1258                          context,
1259                          this,
1260                          request_sender_.get(),
1261                          v8_schema_registry_.get());
1262   const Extension* extension = context->extension();
1263   int manifest_version = extension ? extension->manifest_version() : 1;
1264   bool is_component_extension =
1265       extension && Manifest::IsComponentLocation(extension->location());
1266   bool send_request_disabled =
1267       (extension && Manifest::IsUnpackedLocation(extension->location()) &&
1268        BackgroundInfo::HasLazyBackgroundPage(extension));
1269   module_system->RegisterNativeHandler(
1270       "process",
1271       scoped_ptr<NativeHandler>(new ProcessInfoNativeHandler(
1272           context,
1273           context->GetExtensionID(),
1274           context->GetContextTypeDescription(),
1275           ExtensionsRendererClient::Get()->IsIncognitoProcess(),
1276           is_component_extension,
1277           manifest_version,
1278           send_request_disabled)));
1279
1280   delegate_->RegisterNativeHandlers(this, module_system, context);
1281 }
1282
1283 bool Dispatcher::IsRuntimeAvailableToContext(ScriptContext* context) {
1284   if (extensions::FeatureSwitch::surface_worker()->IsEnabled() &&
1285       context->GetAvailability("surfaceWorkerInternal").is_available()) {
1286     return true;
1287   }
1288   for (const auto& extension : extensions_) {
1289     ExternallyConnectableInfo* info = static_cast<ExternallyConnectableInfo*>(
1290         extension->GetManifestData(manifest_keys::kExternallyConnectable));
1291     if (info && info->matches.MatchesURL(context->GetURL()))
1292       return true;
1293   }
1294   return false;
1295 }
1296
1297 void Dispatcher::UpdateContentCapabilities(ScriptContext* context) {
1298   APIPermissionSet permissions;
1299   for (const auto& extension : extensions_) {
1300     const ContentCapabilitiesInfo& info =
1301         ContentCapabilitiesInfo::Get(extension.get());
1302     if (info.url_patterns.MatchesURL(context->GetURL())) {
1303       APIPermissionSet new_permissions;
1304       APIPermissionSet::Union(permissions, info.permissions, &new_permissions);
1305       permissions = new_permissions;
1306     }
1307   }
1308   context->SetContentCapabilities(permissions);
1309 }
1310
1311 void Dispatcher::PopulateSourceMap() {
1312   const std::vector<std::pair<std::string, int> > resources = GetJsResources();
1313   for (std::vector<std::pair<std::string, int> >::const_iterator resource =
1314            resources.begin();
1315        resource != resources.end();
1316        ++resource) {
1317     source_map_.RegisterSource(resource->first, resource->second);
1318   }
1319   delegate_->PopulateSourceMap(&source_map_);
1320 }
1321
1322 bool Dispatcher::IsWithinPlatformApp() {
1323   for (std::set<std::string>::iterator iter = active_extension_ids_.begin();
1324        iter != active_extension_ids_.end();
1325        ++iter) {
1326     const Extension* extension = extensions_.GetByID(*iter);
1327     if (extension && extension->is_platform_app())
1328       return true;
1329   }
1330   return false;
1331 }
1332
1333 v8::Local<v8::Object> Dispatcher::GetOrCreateObject(
1334     const v8::Local<v8::Object>& object,
1335     const std::string& field,
1336     v8::Isolate* isolate) {
1337   v8::Local<v8::String> key = v8::String::NewFromUtf8(isolate, field.c_str());
1338   // If the object has a callback property, it is assumed it is an unavailable
1339   // API, so it is safe to delete. This is checked before GetOrCreateObject is
1340   // called.
1341   if (object->HasRealNamedCallbackProperty(key)) {
1342     object->Delete(key);
1343   } else if (object->HasRealNamedProperty(key)) {
1344     v8::Local<v8::Value> value = object->Get(key);
1345     CHECK(value->IsObject());
1346     return v8::Local<v8::Object>::Cast(value);
1347   }
1348
1349   v8::Local<v8::Object> new_object = v8::Object::New(isolate);
1350   object->Set(key, new_object);
1351   return new_object;
1352 }
1353
1354 v8::Local<v8::Object> Dispatcher::GetOrCreateBindObjectIfAvailable(
1355     const std::string& api_name,
1356     std::string* bind_name,
1357     ScriptContext* context) {
1358   std::vector<std::string> split;
1359   base::SplitString(api_name, '.', &split);
1360
1361   v8::Local<v8::Object> bind_object;
1362
1363   // Check if this API has an ancestor. If the API's ancestor is available and
1364   // the API is not available, don't install the bindings for this API. If
1365   // the API is available and its ancestor is not, delete the ancestor and
1366   // install the bindings for the API. This is to prevent loading the ancestor
1367   // API schema if it will not be needed.
1368   //
1369   // For example:
1370   //  If app is available and app.window is not, just install app.
1371   //  If app.window is available and app is not, delete app and install
1372   //  app.window on a new object so app does not have to be loaded.
1373   const FeatureProvider* api_feature_provider =
1374       FeatureProvider::GetAPIFeatures();
1375   std::string ancestor_name;
1376   bool only_ancestor_available = false;
1377
1378   for (size_t i = 0; i < split.size() - 1; ++i) {
1379     ancestor_name += (i ? "." : "") + split[i];
1380     if (api_feature_provider->GetFeature(ancestor_name) &&
1381         context->GetAvailability(ancestor_name).is_available() &&
1382         !context->GetAvailability(api_name).is_available()) {
1383       only_ancestor_available = true;
1384       break;
1385     }
1386
1387     if (bind_object.IsEmpty()) {
1388       bind_object = AsObjectOrEmpty(GetOrCreateChrome(context));
1389       if (bind_object.IsEmpty())
1390         return v8::Local<v8::Object>();
1391     }
1392     bind_object = GetOrCreateObject(bind_object, split[i], context->isolate());
1393   }
1394
1395   if (only_ancestor_available)
1396     return v8::Local<v8::Object>();
1397
1398   if (bind_name)
1399     *bind_name = split.back();
1400
1401   return bind_object.IsEmpty() ? AsObjectOrEmpty(GetOrCreateChrome(context))
1402                                : bind_object;
1403 }
1404
1405 void Dispatcher::RequireGuestViewModules(ScriptContext* context) {
1406   Feature::Context context_type = context->context_type();
1407   ModuleSystem* module_system = context->module_system();
1408
1409   // Require AppView.
1410   if (context->GetAvailability("appViewEmbedderInternal").is_available()) {
1411     module_system->Require("appView");
1412   }
1413
1414   // Require ExtensionOptions.
1415   if (context->GetAvailability("extensionOptionsInternal").is_available()) {
1416     module_system->Require("extensionOptions");
1417     module_system->Require("extensionOptionsAttributes");
1418   }
1419
1420   // Require ExtensionView.
1421   if (context->GetAvailability("extensionViewInternal").is_available()) {
1422     module_system->Require("extensionView");
1423     module_system->Require("extensionViewApiMethods");
1424     module_system->Require("extensionViewAttributes");
1425   }
1426
1427   // Require SurfaceView.
1428   if (extensions::FeatureSwitch::surface_worker()->IsEnabled() &&
1429       context->GetAvailability("surfaceWorkerInternal").is_available()) {
1430     module_system->Require("surfaceWorker");
1431   }
1432
1433   // Require WebView.
1434   if (context->GetAvailability("webViewInternal").is_available()) {
1435     module_system->Require("webView");
1436     module_system->Require("webViewApiMethods");
1437     module_system->Require("webViewAttributes");
1438
1439     if (base::CommandLine::ForCurrentProcess()->HasSwitch(
1440             ::switches::kSitePerProcess)) {
1441       module_system->Require("webViewIframe");
1442     }
1443   }
1444
1445   // The "guestViewDeny" module must always be loaded last. It registers
1446   // error-providing custom elements for the GuestView types that are not
1447   // available, and thus all of those types must have been checked and loaded
1448   // (or not loaded) beforehand.
1449   if (context_type == Feature::BLESSED_EXTENSION_CONTEXT) {
1450     module_system->Require("guestViewDeny");
1451   }
1452 }
1453
1454 void Dispatcher::AddChannelSpecificFeatures() {
1455   // chrome-extension: resources should be allowed to register a Service Worker.
1456   if (FeatureProvider::GetBehaviorFeature(BehaviorFeature::kServiceWorker)
1457           ->IsAvailableToEnvironment()
1458           .is_available())
1459     WebSecurityPolicy::registerURLSchemeAsAllowingServiceWorkers(
1460         WebString::fromUTF8(kExtensionScheme));
1461 }
1462
1463 }  // namespace extensions