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