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