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/user_metrics_action.h"
  13 #include "base/strings/string_piece.h"
  14 #include "base/strings/string_split.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/values.h"
  17 #include "content/grit/content_resources.h"
  18 #include "content/public/common/content_switches.h"
  19 #include "content/public/common/url_constants.h"
  20 #include "content/public/renderer/render_thread.h"
  21 #include "content/public/renderer/render_view.h"
  22 #include "content/public/renderer/v8_value_converter.h"
  23 #include "extensions/common/api/messaging/message.h"
  24 #include "extensions/common/constants.h"
  25 #include "extensions/common/extension.h"
  26 #include "extensions/common/extension_api.h"
  27 #include "extensions/common/extension_messages.h"
  28 #include "extensions/common/extension_urls.h"
  29 #include "extensions/common/features/feature.h"
  30 #include "extensions/common/features/feature_provider.h"
  31 #include "extensions/common/manifest.h"
  32 #include "extensions/common/manifest_constants.h"
  33 #include "extensions/common/manifest_handlers/background_info.h"
  34 #include "extensions/common/manifest_handlers/externally_connectable.h"
  35 #include "extensions/common/manifest_handlers/options_page_info.h"
  36 #include "extensions/common/manifest_handlers/sandboxed_page_info.h"
  37 #include "extensions/common/message_bundle.h"
  38 #include "extensions/common/permissions/permission_set.h"
  39 #include "extensions/common/permissions/permissions_data.h"
  40 #include "extensions/common/switches.h"
  41 #include "extensions/common/view_type.h"
  42 #include "extensions/renderer/api_activity_logger.h"
  43 #include "extensions/renderer/api_definitions_natives.h"
  44 #include "extensions/renderer/app_runtime_custom_bindings.h"
  45 #include "extensions/renderer/app_window_custom_bindings.h"
  46 #include "extensions/renderer/binding_generating_native_handler.h"
  47 #include "extensions/renderer/blob_native_handler.h"
  48 #include "extensions/renderer/content_watcher.h"
  49 #include "extensions/renderer/context_menus_custom_bindings.h"
  50 #include "extensions/renderer/css_native_handler.h"
  51 #include "extensions/renderer/dispatcher_delegate.h"
  52 #include "extensions/renderer/document_custom_bindings.h"
  53 #include "extensions/renderer/dom_activity_logger.h"
  54 #include "extensions/renderer/event_bindings.h"
  55 #include "extensions/renderer/extension_groups.h"
  56 #include "extensions/renderer/extension_helper.h"
  57 #include "extensions/renderer/extensions_renderer_client.h"
  58 #include "extensions/renderer/file_system_natives.h"
  59 #include "extensions/renderer/guest_view/guest_view_internal_custom_bindings.h"
  60 #include "extensions/renderer/i18n_custom_bindings.h"
  61 #include "extensions/renderer/id_generator_custom_bindings.h"
  62 #include "extensions/renderer/lazy_background_page_native_handler.h"
  63 #include "extensions/renderer/logging_native_handler.h"
  64 #include "extensions/renderer/messaging_bindings.h"
  65 #include "extensions/renderer/module_system.h"
  66 #include "extensions/renderer/print_native_handler.h"
  67 #include "extensions/renderer/process_info_native_handler.h"
  68 #include "extensions/renderer/render_view_observer_natives.h"
  69 #include "extensions/renderer/request_sender.h"
  70 #include "extensions/renderer/runtime_custom_bindings.h"
  71 #include "extensions/renderer/safe_builtins.h"
  72 #include "extensions/renderer/script_context.h"
  73 #include "extensions/renderer/script_context_set.h"
  74 #include "extensions/renderer/script_injection.h"
  75 #include "extensions/renderer/script_injection_manager.h"
  76 #include "extensions/renderer/send_request_natives.h"
  77 #include "extensions/renderer/set_icon_natives.h"
  78 #include "extensions/renderer/test_features_native_handler.h"
  79 #include "extensions/renderer/user_gestures_native_handler.h"
  80 #include "extensions/renderer/utils_native_handler.h"
  81 #include "extensions/renderer/v8_context_native_handler.h"
  82 #include "grit/extensions_renderer_resources.h"
  83 #include "mojo/public/js/constants.h"
  84 #include "third_party/WebKit/public/platform/WebString.h"
  85 #include "third_party/WebKit/public/platform/WebURLRequest.h"
  86 #include "third_party/WebKit/public/web/WebCustomElement.h"
  87 #include "third_party/WebKit/public/web/WebDataSource.h"
  88 #include "third_party/WebKit/public/web/WebDocument.h"
  89 #include "third_party/WebKit/public/web/WebFrame.h"
  90 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
  91 #include "third_party/WebKit/public/web/WebScopedUserGesture.h"
  92 #include "third_party/WebKit/public/web/WebSecurityPolicy.h"
  93 #include "third_party/WebKit/public/web/WebView.h"
  94 #include "ui/base/layout.h"
  95 #include "ui/base/resource/resource_bundle.h"
  96 #include "v8/include/v8.h"
  97
  98 using base::UserMetricsAction;
  99 using blink::WebDataSource;
 100 using blink::WebDocument;
 101 using blink::WebFrame;
 102 using blink::WebScopedUserGesture;
 103 using blink::WebSecurityPolicy;
 104 using blink::WebString;
 105 using blink::WebVector;
 106 using blink::WebView;
 107 using content::RenderThread;
 108 using content::RenderView;
 109
 110 namespace extensions {
 111
 112 namespace {
 113
 114 static const int64 kInitialExtensionIdleHandlerDelayMs = 5 * 1000;
 115 static const int64 kMaxExtensionIdleHandlerDelayMs = 5 * 60 * 1000;
 116 static const char kEventDispatchFunction[] = "dispatchEvent";
 117 static const char kOnSuspendEvent[] = "runtime.onSuspend";
 118 static const char kOnSuspendCanceledEvent[] = "runtime.onSuspendCanceled";
 119
 120 // Returns the global value for "chrome" from |context|. If one doesn't exist
 121 // creates a new object for it.
 122 //
 123 // Note that this isn't necessarily an object, since webpages can write, for
 124 // example, "window.chrome = true".
 125 v8::Handle<v8::Value> GetOrCreateChrome(ScriptContext* context) {
 126   v8::Handle<v8::String> chrome_string(
 127       v8::String::NewFromUtf8(context->isolate(), "chrome"));
 128   v8::Handle<v8::Object> global(context->v8_context()->Global());
 129   v8::Handle<v8::Value> chrome(global->Get(chrome_string));
 130   if (chrome->IsUndefined()) {
 131     chrome = v8::Object::New(context->isolate());
 132     global->Set(chrome_string, chrome);
 133   }
 134   return chrome;
 135 }
 136
 137 // Returns |value| cast to an object if possible, else an empty handle.
 138 v8::Handle<v8::Object> AsObjectOrEmpty(v8::Handle<v8::Value> value) {
 139   return value->IsObject() ? value.As<v8::Object>() : v8::Handle<v8::Object>();
 140 }
 141
 142 // Calls a method |method_name| in a module |module_name| belonging to the
 143 // module system from |context|. Intended as a callback target from
 144 // ScriptContextSet::ForEach.
 145 void CallModuleMethod(const std::string& module_name,
 146                       const std::string& method_name,
 147                       const base::ListValue* args,
 148                       ScriptContext* context) {
 149   v8::HandleScope handle_scope(context->isolate());
 150   v8::Context::Scope context_scope(context->v8_context());
 151
 152   scoped_ptr<content::V8ValueConverter> converter(
 153       content::V8ValueConverter::create());
 154
 155   std::vector<v8::Handle<v8::Value> > arguments;
 156   for (base::ListValue::const_iterator it = args->begin(); it != args->end();
 157        ++it) {
 158     arguments.push_back(converter->ToV8Value(*it, context->v8_context()));
 159   }
 160
 161   context->module_system()->CallModuleMethod(
 162       module_name, method_name, &arguments);
 163 }
 164
 165 // This handles the "chrome." root API object in script contexts.
 166 class ChromeNativeHandler : public ObjectBackedNativeHandler {
 167  public:
 168   explicit ChromeNativeHandler(ScriptContext* context)
 169       : ObjectBackedNativeHandler(context) {
 170     RouteFunction(
 171         "GetChrome",
 172         base::Bind(&ChromeNativeHandler::GetChrome, base::Unretained(this)));
 173   }
 174
 175   void GetChrome(const v8::FunctionCallbackInfo<v8::Value>& args) {
 176     args.GetReturnValue().Set(GetOrCreateChrome(context()));
 177   }
 178 };
 179
 180 }  // namespace
 181
 182 Dispatcher::Dispatcher(DispatcherDelegate* delegate)
 183     : delegate_(delegate),
 184       content_watcher_(new ContentWatcher()),
 185       source_map_(&ResourceBundle::GetSharedInstance()),
 186       v8_schema_registry_(new V8SchemaRegistry),
 187       is_webkit_initialized_(false),
 188       user_script_set_manager_observer_(this),
 189       webrequest_used_(false) {
 190   const CommandLine& command_line = *(CommandLine::ForCurrentProcess());
 191   is_extension_process_ =
 192       command_line.HasSwitch(switches::kExtensionProcess) ||
 193       command_line.HasSwitch(::switches::kSingleProcess);
 194
 195   if (is_extension_process_) {
 196     RenderThread::Get()->SetIdleNotificationDelayInMs(
 197         kInitialExtensionIdleHandlerDelayMs);
 198   }
 199
 200   RenderThread::Get()->RegisterExtension(SafeBuiltins::CreateV8Extension());
 201
 202   user_script_set_manager_.reset(new UserScriptSetManager(&extensions_));
 203   script_injection_manager_.reset(
 204       new ScriptInjectionManager(&extensions_, user_script_set_manager_.get()));
 205   user_script_set_manager_observer_.Add(user_script_set_manager_.get());
 206   request_sender_.reset(new RequestSender(this));
 207   PopulateSourceMap();
 208 }
 209
 210 Dispatcher::~Dispatcher() {
 211 }
 212
 213 void Dispatcher::OnRenderViewCreated(content::RenderView* render_view) {
 214   script_injection_manager_->OnRenderViewCreated(render_view);
 215 }
 216
 217 bool Dispatcher::IsExtensionActive(const std::string& extension_id) const {
 218   bool is_active =
 219       active_extension_ids_.find(extension_id) != active_extension_ids_.end();
 220   if (is_active)
 221     CHECK(extensions_.Contains(extension_id));
 222   return is_active;
 223 }
 224
 225 const Extension* Dispatcher::GetExtensionFromFrameAndWorld(
 226     const WebFrame* frame,
 227     int world_id,
 228     bool use_effective_url) {
 229   std::string extension_id;
 230   if (world_id != 0) {
 231     // Isolated worlds (content script).
 232     extension_id = ScriptInjection::GetExtensionIdForIsolatedWorld(world_id);
 233   } else if (!frame->document().securityOrigin().isUnique()) {
 234     // TODO(kalman): Delete the above check.
 235
 236     // Extension pages (chrome-extension:// URLs).
 237     GURL frame_url = ScriptContext::GetDataSourceURLForFrame(frame);
 238     frame_url = ScriptContext::GetEffectiveDocumentURL(
 239         frame, frame_url, use_effective_url);
 240     extension_id = extensions_.GetExtensionOrAppIDByURL(frame_url);
 241   }
 242
 243   const Extension* extension = extensions_.GetByID(extension_id);
 244   if (!extension && !extension_id.empty()) {
 245     // There are conditions where despite a context being associated with an
 246     // extension, no extension actually gets found.  Ignore "invalid" because
 247     // CSP blocks extension page loading by switching the extension ID to
 248     // "invalid". This isn't interesting.
 249     if (extension_id != "invalid") {
 250       LOG(ERROR) << "Extension \"" << extension_id << "\" not found";
 251       RenderThread::Get()->RecordAction(
 252           UserMetricsAction("ExtensionNotFound_ED"));
 253     }
 254   }
 255   return extension;
 256 }
 257
 258 void Dispatcher::DidCreateScriptContext(
 259     WebFrame* frame,
 260     const v8::Handle<v8::Context>& v8_context,
 261     int extension_group,
 262     int world_id) {
 263   const Extension* extension =
 264       GetExtensionFromFrameAndWorld(frame, world_id, false);
 265   const Extension* effective_extension =
 266       GetExtensionFromFrameAndWorld(frame, world_id, true);
 267
 268   GURL frame_url = ScriptContext::GetDataSourceURLForFrame(frame);
 269   Feature::Context context_type =
 270       ClassifyJavaScriptContext(extension,
 271                                 extension_group,
 272                                 frame_url,
 273                                 frame->document().securityOrigin());
 274   Feature::Context effective_context_type = ClassifyJavaScriptContext(
 275       effective_extension,
 276       extension_group,
 277       ScriptContext::GetEffectiveDocumentURL(frame, frame_url, true),
 278       frame->document().securityOrigin());
 279
 280   ScriptContext* context =
 281       delegate_->CreateScriptContext(v8_context,
 282                                      frame,
 283                                      extension,
 284                                      context_type,
 285                                      effective_extension,
 286                                      effective_context_type).release();
 287   script_context_set_.Add(context);
 288
 289   // Initialize origin permissions for content scripts, which can't be
 290   // initialized in |OnActivateExtension|.
 291   if (context_type == Feature::CONTENT_SCRIPT_CONTEXT)
 292     InitOriginPermissions(extension);
 293
 294   {
 295     scoped_ptr<ModuleSystem> module_system(
 296         new ModuleSystem(context, &source_map_));
 297     context->set_module_system(module_system.Pass());
 298   }
 299   ModuleSystem* module_system = context->module_system();
 300
 301   // Enable natives in startup.
 302   ModuleSystem::NativesEnabledScope natives_enabled_scope(module_system);
 303
 304   RegisterNativeHandlers(module_system, context);
 305
 306   // chrome.Event is part of the public API (although undocumented). Make it
 307   // lazily evalulate to Event from event_bindings.js. For extensions only
 308   // though, not all webpages!
 309   if (context->extension()) {
 310     v8::Handle<v8::Object> chrome = AsObjectOrEmpty(GetOrCreateChrome(context));
 311     if (!chrome.IsEmpty())
 312       module_system->SetLazyField(chrome, "Event", kEventBindings, "Event");
 313   }
 314
 315   UpdateBindingsForContext(context);
 316
 317   bool is_within_platform_app = IsWithinPlatformApp();
 318   // Inject custom JS into the platform app context.
 319   if (is_within_platform_app) {
 320     module_system->Require("platformApp");
 321   }
 322
 323   if (context->GetAvailability("appViewEmbedderInternal").is_available()) {
 324     module_system->Require("appView");
 325   } else if (context_type == Feature::BLESSED_EXTENSION_CONTEXT) {
 326     module_system->Require("denyAppView");
 327   }
 328
 329   // Note: setting up the WebView class here, not the chrome.webview API.
 330   // The API will be automatically set up when first used.
 331   if (context->GetAvailability("webViewInternal").is_available()) {
 332     module_system->Require("webView");
 333     module_system->Require("webViewConstants");
 334     module_system->Require("webViewAttributes");
 335     if (context->GetAvailability("webViewExperimentalInternal")
 336             .is_available()) {
 337       module_system->Require("webViewExperimental");
 338     }
 339   } else if (context_type == Feature::BLESSED_EXTENSION_CONTEXT) {
 340     module_system->Require("denyWebView");
 341   }
 342
 343   delegate_->RequireAdditionalModules(context, is_within_platform_app);
 344
 345   VLOG(1) << "Num tracked contexts: " << script_context_set_.size();
 346 }
 347
 348 void Dispatcher::WillReleaseScriptContext(
 349     WebFrame* frame,
 350     const v8::Handle<v8::Context>& v8_context,
 351     int world_id) {
 352   ScriptContext* context = script_context_set_.GetByV8Context(v8_context);
 353   if (!context)
 354     return;
 355
 356   context->DispatchOnUnloadEvent();
 357   // TODO(kalman): add an invalidation observer interface to ScriptContext.
 358   request_sender_->InvalidateSource(context);
 359
 360   script_context_set_.Remove(context);
 361   VLOG(1) << "Num tracked contexts: " << script_context_set_.size();
 362 }
 363
 364 void Dispatcher::DidCreateDocumentElement(blink::WebFrame* frame) {
 365   // Note: use GetEffectiveDocumentURL not just frame->document()->url()
 366   // so that this also injects the stylesheet on about:blank frames that
 367   // are hosted in the extension process.
 368   GURL effective_document_url = ScriptContext::GetEffectiveDocumentURL(
 369       frame, frame->document().url(), true /* match_about_blank */);
 370
 371   const Extension* extension =
 372       extensions_.GetExtensionOrAppByURL(effective_document_url);
 373
 374   if (extension &&
 375       (extension->is_extension() || extension->is_platform_app())) {
 376     int resource_id = extension->is_platform_app() ? IDR_PLATFORM_APP_CSS
 377                                                    : IDR_EXTENSION_FONTS_CSS;
 378     std::string stylesheet = ResourceBundle::GetSharedInstance()
 379                                  .GetRawDataResource(resource_id)
 380                                  .as_string();
 381     ReplaceFirstSubstringAfterOffset(
 382         &stylesheet, 0, "$FONTFAMILY", system_font_family_);
 383     ReplaceFirstSubstringAfterOffset(
 384         &stylesheet, 0, "$FONTSIZE", system_font_size_);
 385
 386     // Blink doesn't let us define an additional user agent stylesheet, so
 387     // we insert the default platform app or extension stylesheet into all
 388     // documents that are loaded in each app or extension.
 389     frame->document().insertStyleSheet(WebString::fromUTF8(stylesheet));
 390   }
 391
 392   // If this is an extension options page, and the extension has opted into
 393   // using Chrome styles, then insert the Chrome extension stylesheet.
 394   if (extension && extension->is_extension() &&
 395       OptionsPageInfo::ShouldUseChromeStyle(extension) &&
 396       effective_document_url == OptionsPageInfo::GetOptionsPage(extension)) {
 397     frame->document().insertStyleSheet(
 398         WebString::fromUTF8(ResourceBundle::GetSharedInstance()
 399                                 .GetRawDataResource(IDR_EXTENSION_CSS)
 400                                 .as_string()));
 401   }
 402
 403   content_watcher_->DidCreateDocumentElement(frame);
 404 }
 405
 406 void Dispatcher::DidMatchCSS(
 407     blink::WebFrame* frame,
 408     const blink::WebVector<blink::WebString>& newly_matching_selectors,
 409     const blink::WebVector<blink::WebString>& stopped_matching_selectors) {
 410   content_watcher_->DidMatchCSS(
 411       frame, newly_matching_selectors, stopped_matching_selectors);
 412 }
 413
 414 void Dispatcher::OnExtensionResponse(int request_id,
 415                                      bool success,
 416                                      const base::ListValue& response,
 417                                      const std::string& error) {
 418   request_sender_->HandleResponse(request_id, success, response, error);
 419 }
 420
 421 bool Dispatcher::CheckContextAccessToExtensionAPI(
 422     const std::string& function_name,
 423     ScriptContext* context) const {
 424   if (!context) {
 425     DLOG(ERROR) << "Not in a v8::Context";
 426     return false;
 427   }
 428
 429   // Theoretically we could end up with bindings being injected into sandboxed
 430   // frames, for example content scripts. Don't let them execute API functions.
 431   blink::WebFrame* frame = context->web_frame();
 432   if (IsSandboxedPage(ScriptContext::GetDataSourceURLForFrame(frame))) {
 433     static const char kMessage[] =
 434         "%s cannot be used within a sandboxed frame.";
 435     std::string error_msg = base::StringPrintf(kMessage, function_name.c_str());
 436     context->isolate()->ThrowException(v8::Exception::Error(
 437         v8::String::NewFromUtf8(context->isolate(), error_msg.c_str())));
 438     return false;
 439   }
 440
 441   Feature::Availability availability = context->GetAvailability(function_name);
 442   if (!availability.is_available()) {
 443     context->isolate()->ThrowException(
 444         v8::Exception::Error(v8::String::NewFromUtf8(
 445             context->isolate(), availability.message().c_str())));
 446   }
 447
 448   return availability.is_available();
 449 }
 450
 451 void Dispatcher::DispatchEvent(const std::string& extension_id,
 452                                const std::string& event_name) const {
 453   base::ListValue args;
 454   args.Set(0, new base::StringValue(event_name));
 455   args.Set(1, new base::ListValue());
 456
 457   // Needed for Windows compilation, since kEventBindings is declared extern.
 458   const char* local_event_bindings = kEventBindings;
 459   script_context_set_.ForEach(extension_id,
 460                               base::Bind(&CallModuleMethod,
 461                                          local_event_bindings,
 462                                          kEventDispatchFunction,
 463                                          &args));
 464 }
 465
 466 void Dispatcher::InvokeModuleSystemMethod(content::RenderView* render_view,
 467                                           const std::string& extension_id,
 468                                           const std::string& module_name,
 469                                           const std::string& function_name,
 470                                           const base::ListValue& args,
 471                                           bool user_gesture) {
 472   scoped_ptr<WebScopedUserGesture> web_user_gesture;
 473   if (user_gesture)
 474     web_user_gesture.reset(new WebScopedUserGesture);
 475
 476   script_context_set_.ForEach(
 477       extension_id,
 478       render_view,
 479       base::Bind(&CallModuleMethod, module_name, function_name, &args));
 480
 481   // Reset the idle handler each time there's any activity like event or message
 482   // dispatch, for which Invoke is the chokepoint.
 483   if (is_extension_process_) {
 484     RenderThread::Get()->ScheduleIdleHandler(
 485         kInitialExtensionIdleHandlerDelayMs);
 486   }
 487
 488   // Tell the browser process when an event has been dispatched with a lazy
 489   // background page active.
 490   const Extension* extension = extensions_.GetByID(extension_id);
 491   if (extension && BackgroundInfo::HasLazyBackgroundPage(extension) &&
 492       module_name == kEventBindings &&
 493       function_name == kEventDispatchFunction) {
 494     RenderView* background_view =
 495         ExtensionHelper::GetBackgroundPage(extension_id);
 496     if (background_view) {
 497       background_view->Send(
 498           new ExtensionHostMsg_EventAck(background_view->GetRoutingID()));
 499     }
 500   }
 501 }
 502
 503 void Dispatcher::ClearPortData(int port_id) {
 504   // Only the target port side has entries in |port_to_tab_id_map_|. If
 505   // |port_id| is a source port, std::map::erase() will just silently fail
 506   // here as a no-op.
 507   port_to_tab_id_map_.erase(port_id);
 508 }
 509
 510 // static
 511 std::vector<std::pair<std::string, int> > Dispatcher::GetJsResources() {
 512   std::vector<std::pair<std::string, int> > resources;
 513
 514   // Libraries.
 515   resources.push_back(std::make_pair("appView", IDR_APP_VIEW_JS));
 516   resources.push_back(std::make_pair("denyAppView", IDR_APP_VIEW_DENY_JS));
 517   resources.push_back(std::make_pair("entryIdManager", IDR_ENTRY_ID_MANAGER));
 518   resources.push_back(std::make_pair(kEventBindings, IDR_EVENT_BINDINGS_JS));
 519   resources.push_back(std::make_pair("imageUtil", IDR_IMAGE_UTIL_JS));
 520   resources.push_back(std::make_pair("json_schema", IDR_JSON_SCHEMA_JS));
 521   resources.push_back(std::make_pair("lastError", IDR_LAST_ERROR_JS));
 522   resources.push_back(std::make_pair("messaging", IDR_MESSAGING_JS));
 523   resources.push_back(
 524       std::make_pair("messaging_utils", IDR_MESSAGING_UTILS_JS));
 525   resources.push_back(std::make_pair(kSchemaUtils, IDR_SCHEMA_UTILS_JS));
 526   resources.push_back(std::make_pair("sendRequest", IDR_SEND_REQUEST_JS));
 527   resources.push_back(std::make_pair("setIcon", IDR_SET_ICON_JS));
 528   resources.push_back(std::make_pair("test", IDR_TEST_CUSTOM_BINDINGS_JS));
 529   resources.push_back(
 530       std::make_pair("test_environment_specific_bindings",
 531                      IDR_BROWSER_TEST_ENVIRONMENT_SPECIFIC_BINDINGS_JS));
 532   resources.push_back(std::make_pair("uncaught_exception_handler",
 533                                      IDR_UNCAUGHT_EXCEPTION_HANDLER_JS));
 534   resources.push_back(std::make_pair("unload_event", IDR_UNLOAD_EVENT_JS));
 535   resources.push_back(std::make_pair("utils", IDR_UTILS_JS));
 536   resources.push_back(std::make_pair("webRequest",
 537                                      IDR_WEB_REQUEST_CUSTOM_BINDINGS_JS));
 538   resources.push_back(
 539        std::make_pair("webRequestInternal",
 540                       IDR_WEB_REQUEST_INTERNAL_CUSTOM_BINDINGS_JS));
 541   // Note: webView not webview so that this doesn't interfere with the
 542   // chrome.webview API bindings.
 543   resources.push_back(std::make_pair("webView", IDR_WEB_VIEW_JS));
 544   resources.push_back(std::make_pair("webViewAttributes",
 545                                      IDR_WEB_VIEW_ATTRIBUTES_JS));
 546   resources.push_back(std::make_pair("webViewConstants",
 547                                      IDR_WEB_VIEW_CONSTANTS_JS));
 548   resources.push_back(std::make_pair("webViewEvents", IDR_WEB_VIEW_EVENTS_JS));
 549   resources.push_back(
 550       std::make_pair("webViewExperimental", IDR_WEB_VIEW_EXPERIMENTAL_JS));
 551   resources.push_back(std::make_pair("webViewInternal",
 552                                      IDR_WEB_VIEW_INTERNAL_CUSTOM_BINDINGS_JS));
 553   resources.push_back(std::make_pair("denyWebView", IDR_WEB_VIEW_DENY_JS));
 554   resources.push_back(
 555       std::make_pair(mojo::kBufferModuleName, IDR_MOJO_BUFFER_JS));
 556   resources.push_back(
 557       std::make_pair(mojo::kCodecModuleName, IDR_MOJO_CODEC_JS));
 558   resources.push_back(
 559       std::make_pair(mojo::kConnectionModuleName, IDR_MOJO_CONNECTION_JS));
 560   resources.push_back(
 561       std::make_pair(mojo::kConnectorModuleName, IDR_MOJO_CONNECTOR_JS));
 562   resources.push_back(
 563       std::make_pair(mojo::kRouterModuleName, IDR_MOJO_ROUTER_JS));
 564   resources.push_back(
 565       std::make_pair(mojo::kUnicodeModuleName, IDR_MOJO_UNICODE_JS));
 566   resources.push_back(
 567       std::make_pair(mojo::kValidatorModuleName, IDR_MOJO_VALIDATOR_JS));
 568   resources.push_back(std::make_pair("async_waiter", IDR_ASYNC_WAITER_JS));
 569   resources.push_back(std::make_pair("data_receiver", IDR_DATA_RECEIVER_JS));
 570   resources.push_back(std::make_pair("data_sender", IDR_DATA_SENDER_JS));
 571   resources.push_back(std::make_pair("keep_alive", IDR_KEEP_ALIVE_JS));
 572   resources.push_back(std::make_pair("extensions/common/mojo/keep_alive.mojom",
 573                                      IDR_KEEP_ALIVE_MOJOM_JS));
 574   resources.push_back(std::make_pair("device/serial/data_stream.mojom",
 575                                      IDR_DATA_STREAM_MOJOM_JS));
 576   resources.push_back(
 577       std::make_pair("device/serial/data_stream_serialization.mojom",
 578                      IDR_DATA_STREAM_SERIALIZATION_MOJOM_JS));
 579
 580   // Custom bindings.
 581   resources.push_back(
 582       std::make_pair("app.runtime", IDR_APP_RUNTIME_CUSTOM_BINDINGS_JS));
 583   resources.push_back(
 584       std::make_pair("app.window", IDR_APP_WINDOW_CUSTOM_BINDINGS_JS));
 585   resources.push_back(
 586       std::make_pair("declarativeWebRequest",
 587                      IDR_DECLARATIVE_WEBREQUEST_CUSTOM_BINDINGS_JS));
 588   resources.push_back(
 589       std::make_pair("contextMenus", IDR_CONTEXT_MENUS_CUSTOM_BINDINGS_JS));
 590   resources.push_back(
 591       std::make_pair("extension", IDR_EXTENSION_CUSTOM_BINDINGS_JS));
 592   resources.push_back(std::make_pair("i18n", IDR_I18N_CUSTOM_BINDINGS_JS));
 593   resources.push_back(
 594       std::make_pair("permissions", IDR_PERMISSIONS_CUSTOM_BINDINGS_JS));
 595   resources.push_back(
 596       std::make_pair("runtime", IDR_RUNTIME_CUSTOM_BINDINGS_JS));
 597   resources.push_back(std::make_pair("windowControls", IDR_WINDOW_CONTROLS_JS));
 598   resources.push_back(
 599       std::make_pair("webViewRequest",
 600                      IDR_WEB_VIEW_REQUEST_CUSTOM_BINDINGS_JS));
 601   resources.push_back(std::make_pair("binding", IDR_BINDING_JS));
 602
 603   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 604           switches::kEnableMojoSerialService)) {
 605     resources.push_back(
 606         std::make_pair("serial", IDR_SERIAL_CUSTOM_BINDINGS_JS));
 607   }
 608   resources.push_back(std::make_pair("serial_service", IDR_SERIAL_SERVICE_JS));
 609   resources.push_back(
 610       std::make_pair("device/serial/serial.mojom", IDR_SERIAL_MOJOM_JS));
 611   resources.push_back(std::make_pair("device/serial/serial_serialization.mojom",
 612                                      IDR_SERIAL_SERIALIZATION_MOJOM_JS));
 613
 614   // Custom types sources.
 615   resources.push_back(std::make_pair("StorageArea", IDR_STORAGE_AREA_JS));
 616
 617   // Platform app sources that are not API-specific..
 618   resources.push_back(std::make_pair("platformApp", IDR_PLATFORM_APP_JS));
 619
 620   return resources;
 621 }
 622
 623 // NOTE: please use the naming convention "foo_natives" for these.
 624 // static
 625 void Dispatcher::RegisterNativeHandlers(ModuleSystem* module_system,
 626                                         ScriptContext* context,
 627                                         Dispatcher* dispatcher,
 628                                         RequestSender* request_sender,
 629                                         V8SchemaRegistry* v8_schema_registry) {
 630   module_system->RegisterNativeHandler(
 631       "chrome", scoped_ptr<NativeHandler>(new ChromeNativeHandler(context)));
 632   module_system->RegisterNativeHandler(
 633       "lazy_background_page",
 634       scoped_ptr<NativeHandler>(new LazyBackgroundPageNativeHandler(context)));
 635   module_system->RegisterNativeHandler(
 636       "logging", scoped_ptr<NativeHandler>(new LoggingNativeHandler(context)));
 637   module_system->RegisterNativeHandler("schema_registry",
 638                                        v8_schema_registry->AsNativeHandler());
 639   module_system->RegisterNativeHandler(
 640       "print", scoped_ptr<NativeHandler>(new PrintNativeHandler(context)));
 641   module_system->RegisterNativeHandler(
 642       "test_features",
 643       scoped_ptr<NativeHandler>(new TestFeaturesNativeHandler(context)));
 644   module_system->RegisterNativeHandler(
 645       "user_gestures",
 646       scoped_ptr<NativeHandler>(new UserGesturesNativeHandler(context)));
 647   module_system->RegisterNativeHandler(
 648       "utils", scoped_ptr<NativeHandler>(new UtilsNativeHandler(context)));
 649   module_system->RegisterNativeHandler(
 650       "v8_context",
 651       scoped_ptr<NativeHandler>(
 652           new V8ContextNativeHandler(context, dispatcher)));
 653   module_system->RegisterNativeHandler(
 654       "event_natives",
 655       scoped_ptr<NativeHandler>(new EventBindings(dispatcher, context)));
 656   module_system->RegisterNativeHandler(
 657       "messaging_natives",
 658       scoped_ptr<NativeHandler>(MessagingBindings::Get(dispatcher, context)));
 659   module_system->RegisterNativeHandler(
 660       "apiDefinitions",
 661       scoped_ptr<NativeHandler>(
 662           new ApiDefinitionsNatives(dispatcher, context)));
 663   module_system->RegisterNativeHandler(
 664       "sendRequest",
 665       scoped_ptr<NativeHandler>(
 666           new SendRequestNatives(request_sender, context)));
 667   module_system->RegisterNativeHandler(
 668       "setIcon",
 669       scoped_ptr<NativeHandler>(new SetIconNatives(request_sender, context)));
 670   module_system->RegisterNativeHandler(
 671       "activityLogger",
 672       scoped_ptr<NativeHandler>(new APIActivityLogger(context)));
 673   module_system->RegisterNativeHandler(
 674       "renderViewObserverNatives",
 675       scoped_ptr<NativeHandler>(new RenderViewObserverNatives(context)));
 676
 677   // Natives used by multiple APIs.
 678   module_system->RegisterNativeHandler(
 679       "file_system_natives",
 680       scoped_ptr<NativeHandler>(new FileSystemNatives(context)));
 681
 682   // Custom bindings.
 683   module_system->RegisterNativeHandler(
 684       "app_runtime",
 685       scoped_ptr<NativeHandler>(new AppRuntimeCustomBindings(context)));
 686   module_system->RegisterNativeHandler(
 687       "app_window_natives",
 688       scoped_ptr<NativeHandler>(
 689           new AppWindowCustomBindings(dispatcher, context)));
 690   module_system->RegisterNativeHandler(
 691       "blob_natives",
 692       scoped_ptr<NativeHandler>(new BlobNativeHandler(context)));
 693   module_system->RegisterNativeHandler(
 694       "context_menus",
 695       scoped_ptr<NativeHandler>(new ContextMenusCustomBindings(context)));
 696   module_system->RegisterNativeHandler(
 697       "css_natives", scoped_ptr<NativeHandler>(new CssNativeHandler(context)));
 698   module_system->RegisterNativeHandler(
 699       "document_natives",
 700       scoped_ptr<NativeHandler>(new DocumentCustomBindings(context)));
 701   module_system->RegisterNativeHandler(
 702       "guest_view_internal",
 703       scoped_ptr<NativeHandler>(
 704           new GuestViewInternalCustomBindings(context)));
 705   module_system->RegisterNativeHandler(
 706       "i18n", scoped_ptr<NativeHandler>(new I18NCustomBindings(context)));
 707   module_system->RegisterNativeHandler(
 708       "id_generator",
 709       scoped_ptr<NativeHandler>(new IdGeneratorCustomBindings(context)));
 710   module_system->RegisterNativeHandler(
 711       "runtime", scoped_ptr<NativeHandler>(new RuntimeCustomBindings(context)));
 712 }
 713
 714 bool Dispatcher::OnControlMessageReceived(const IPC::Message& message) {
 715   bool handled = true;
 716   IPC_BEGIN_MESSAGE_MAP(Dispatcher, message)
 717   IPC_MESSAGE_HANDLER(ExtensionMsg_ActivateExtension, OnActivateExtension)
 718   IPC_MESSAGE_HANDLER(ExtensionMsg_CancelSuspend, OnCancelSuspend)
 719   IPC_MESSAGE_HANDLER(ExtensionMsg_ClearTabSpecificPermissions,
 720                       OnClearTabSpecificPermissions)
 721   IPC_MESSAGE_HANDLER(ExtensionMsg_DeliverMessage, OnDeliverMessage)
 722   IPC_MESSAGE_HANDLER(ExtensionMsg_DispatchOnConnect, OnDispatchOnConnect)
 723   IPC_MESSAGE_HANDLER(ExtensionMsg_DispatchOnDisconnect, OnDispatchOnDisconnect)
 724   IPC_MESSAGE_HANDLER(ExtensionMsg_Loaded, OnLoaded)
 725   IPC_MESSAGE_HANDLER(ExtensionMsg_MessageInvoke, OnMessageInvoke)
 726   IPC_MESSAGE_HANDLER(ExtensionMsg_SetChannel, OnSetChannel)
 727   IPC_MESSAGE_HANDLER(ExtensionMsg_SetFunctionNames, OnSetFunctionNames)
 728   IPC_MESSAGE_HANDLER(ExtensionMsg_SetScriptingWhitelist,
 729                       OnSetScriptingWhitelist)
 730   IPC_MESSAGE_HANDLER(ExtensionMsg_SetSystemFont, OnSetSystemFont)
 731   IPC_MESSAGE_HANDLER(ExtensionMsg_ShouldSuspend, OnShouldSuspend)
 732   IPC_MESSAGE_HANDLER(ExtensionMsg_Suspend, OnSuspend)
 733   IPC_MESSAGE_HANDLER(ExtensionMsg_TransferBlobs, OnTransferBlobs)
 734   IPC_MESSAGE_HANDLER(ExtensionMsg_Unloaded, OnUnloaded)
 735   IPC_MESSAGE_HANDLER(ExtensionMsg_UpdatePermissions, OnUpdatePermissions)
 736   IPC_MESSAGE_HANDLER(ExtensionMsg_UpdateTabSpecificPermissions,
 737                       OnUpdateTabSpecificPermissions)
 738   IPC_MESSAGE_HANDLER(ExtensionMsg_UsingWebRequestAPI, OnUsingWebRequestAPI)
 739   IPC_MESSAGE_FORWARD(ExtensionMsg_WatchPages,
 740                       content_watcher_.get(),
 741                       ContentWatcher::OnWatchPages)
 742   IPC_MESSAGE_UNHANDLED(handled = false)
 743   IPC_END_MESSAGE_MAP()
 744
 745   return handled;
 746 }
 747
 748 void Dispatcher::WebKitInitialized() {
 749   // For extensions, we want to ensure we call the IdleHandler every so often,
 750   // even if the extension keeps up activity.
 751   if (is_extension_process_) {
 752     forced_idle_timer_.reset(new base::RepeatingTimer<content::RenderThread>);
 753     forced_idle_timer_->Start(
 754         FROM_HERE,
 755         base::TimeDelta::FromMilliseconds(kMaxExtensionIdleHandlerDelayMs),
 756         RenderThread::Get(),
 757         &RenderThread::IdleHandler);
 758   }
 759
 760   // Initialize host permissions for any extensions that were activated before
 761   // WebKit was initialized.
 762   for (std::set<std::string>::iterator iter = active_extension_ids_.begin();
 763        iter != active_extension_ids_.end();
 764        ++iter) {
 765     const Extension* extension = extensions_.GetByID(*iter);
 766     CHECK(extension);
 767
 768     InitOriginPermissions(extension);
 769   }
 770
 771   EnableCustomElementWhiteList();
 772
 773   is_webkit_initialized_ = true;
 774 }
 775
 776 void Dispatcher::IdleNotification() {
 777   if (is_extension_process_ && forced_idle_timer_) {
 778     // Dampen the forced delay as well if the extension stays idle for long
 779     // periods of time. (forced_idle_timer_ can be NULL after
 780     // OnRenderProcessShutdown has been called.)
 781     int64 forced_delay_ms =
 782         std::max(RenderThread::Get()->GetIdleNotificationDelayInMs(),
 783                  kMaxExtensionIdleHandlerDelayMs);
 784     forced_idle_timer_->Stop();
 785     forced_idle_timer_->Start(
 786         FROM_HERE,
 787         base::TimeDelta::FromMilliseconds(forced_delay_ms),
 788         RenderThread::Get(),
 789         &RenderThread::IdleHandler);
 790   }
 791 }
 792
 793 void Dispatcher::OnRenderProcessShutdown() {
 794   v8_schema_registry_.reset();
 795   forced_idle_timer_.reset();
 796 }
 797
 798 void Dispatcher::OnActivateExtension(const std::string& extension_id) {
 799   const Extension* extension = extensions_.GetByID(extension_id);
 800   if (!extension) {
 801     // Extension was activated but was never loaded. This probably means that
 802     // the renderer failed to load it (or the browser failed to tell us when it
 803     // did). Failures shouldn't happen, but instead of crashing there (which
 804     // executes on all renderers) be conservative and only crash in the renderer
 805     // of the extension which failed to load; this one.
 806     std::string& error = extension_load_errors_[extension_id];
 807     char minidump[256];
 808     base::debug::Alias(&minidump);
 809     base::snprintf(minidump,
 810                    arraysize(minidump),
 811                    "e::dispatcher:%s:%s",
 812                    extension_id.c_str(),
 813                    error.c_str());
 814     CHECK(extension) << extension_id << " was never loaded: " << error;
 815   }
 816
 817   active_extension_ids_.insert(extension_id);
 818
 819   // This is called when starting a new extension page, so start the idle
 820   // handler ticking.
 821   RenderThread::Get()->ScheduleIdleHandler(kInitialExtensionIdleHandlerDelayMs);
 822
 823   if (is_webkit_initialized_) {
 824     DOMActivityLogger::AttachToWorld(
 825         DOMActivityLogger::kMainWorldId, extension_id);
 826
 827     InitOriginPermissions(extension);
 828   }
 829
 830   UpdateActiveExtensions();
 831 }
 832
 833 void Dispatcher::OnCancelSuspend(const std::string& extension_id) {
 834   DispatchEvent(extension_id, kOnSuspendCanceledEvent);
 835 }
 836
 837 void Dispatcher::OnClearTabSpecificPermissions(
 838     int tab_id,
 839     const std::vector<std::string>& extension_ids) {
 840   delegate_->ClearTabSpecificPermissions(this, tab_id, extension_ids);
 841 }
 842
 843 void Dispatcher::OnDeliverMessage(int target_port_id, const Message& message) {
 844   scoped_ptr<RequestSender::ScopedTabID> scoped_tab_id;
 845   std::map<int, int>::const_iterator it =
 846       port_to_tab_id_map_.find(target_port_id);
 847   if (it != port_to_tab_id_map_.end()) {
 848     scoped_tab_id.reset(
 849         new RequestSender::ScopedTabID(request_sender(), it->second));
 850   }
 851
 852   MessagingBindings::DeliverMessage(script_context_set_,
 853                                     target_port_id,
 854                                     message,
 855                                     NULL);  // All render views.
 856 }
 857
 858 void Dispatcher::OnDispatchOnConnect(
 859     int target_port_id,
 860     const std::string& channel_name,
 861     const base::DictionaryValue& source_tab,
 862     const ExtensionMsg_ExternalConnectionInfo& info,
 863     const std::string& tls_channel_id) {
 864   DCHECK(!ContainsKey(port_to_tab_id_map_, target_port_id));
 865   DCHECK_EQ(1, target_port_id % 2);  // target renderer ports have odd IDs.
 866   int sender_tab_id = -1;
 867   source_tab.GetInteger("id", &sender_tab_id);
 868   port_to_tab_id_map_[target_port_id] = sender_tab_id;
 869
 870   MessagingBindings::DispatchOnConnect(script_context_set_,
 871                                        target_port_id,
 872                                        channel_name,
 873                                        source_tab,
 874                                        info,
 875                                        tls_channel_id,
 876                                        NULL);  // All render views.
 877 }
 878
 879 void Dispatcher::OnDispatchOnDisconnect(int port_id,
 880                                         const std::string& error_message) {
 881   MessagingBindings::DispatchOnDisconnect(script_context_set_,
 882                                           port_id,
 883                                           error_message,
 884                                           NULL);  // All render views.
 885 }
 886
 887 void Dispatcher::OnLoaded(
 888     const std::vector<ExtensionMsg_Loaded_Params>& loaded_extensions) {
 889   std::vector<ExtensionMsg_Loaded_Params>::const_iterator i;
 890   for (i = loaded_extensions.begin(); i != loaded_extensions.end(); ++i) {
 891     std::string error;
 892     scoped_refptr<const Extension> extension = i->ConvertToExtension(&error);
 893     if (!extension.get()) {
 894       extension_load_errors_[i->id] = error;
 895       continue;
 896     }
 897     OnLoadedInternal(extension);
 898   }
 899   // Update the available bindings for all contexts. These may have changed if
 900   // an externally_connectable extension was loaded that can connect to an
 901   // open webpage.
 902   UpdateBindings("");
 903 }
 904
 905 void Dispatcher::OnLoadedInternal(scoped_refptr<const Extension> extension) {
 906   extensions_.Insert(extension);
 907 }
 908
 909 void Dispatcher::OnMessageInvoke(const std::string& extension_id,
 910                                  const std::string& module_name,
 911                                  const std::string& function_name,
 912                                  const base::ListValue& args,
 913                                  bool user_gesture) {
 914   InvokeModuleSystemMethod(
 915       NULL, extension_id, module_name, function_name, args, user_gesture);
 916 }
 917
 918 void Dispatcher::OnSetChannel(int channel) {
 919   delegate_->SetChannel(channel);
 920 }
 921
 922 void Dispatcher::OnSetFunctionNames(const std::vector<std::string>& names) {
 923   function_names_.clear();
 924   for (size_t i = 0; i < names.size(); ++i)
 925     function_names_.insert(names[i]);
 926 }
 927
 928 void Dispatcher::OnSetScriptingWhitelist(
 929     const ExtensionsClient::ScriptingWhitelist& extension_ids) {
 930   ExtensionsClient::Get()->SetScriptingWhitelist(extension_ids);
 931 }
 932
 933 void Dispatcher::OnSetSystemFont(const std::string& font_family,
 934                                  const std::string& font_size) {
 935   system_font_family_ = font_family;
 936   system_font_size_ = font_size;
 937 }
 938
 939 void Dispatcher::OnShouldSuspend(const std::string& extension_id,
 940                                  uint64 sequence_id) {
 941   RenderThread::Get()->Send(
 942       new ExtensionHostMsg_ShouldSuspendAck(extension_id, sequence_id));
 943 }
 944
 945 void Dispatcher::OnSuspend(const std::string& extension_id) {
 946   // Dispatch the suspend event. This doesn't go through the standard event
 947   // dispatch machinery because it requires special handling. We need to let
 948   // the browser know when we are starting and stopping the event dispatch, so
 949   // that it still considers the extension idle despite any activity the suspend
 950   // event creates.
 951   DispatchEvent(extension_id, kOnSuspendEvent);
 952   RenderThread::Get()->Send(new ExtensionHostMsg_SuspendAck(extension_id));
 953 }
 954
 955 void Dispatcher::OnTransferBlobs(const std::vector<std::string>& blob_uuids) {
 956   RenderThread::Get()->Send(new ExtensionHostMsg_TransferBlobsAck(blob_uuids));
 957 }
 958
 959 void Dispatcher::OnUnloaded(const std::string& id) {
 960   extensions_.Remove(id);
 961   active_extension_ids_.erase(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   ScriptContextSet::ContextSet removed_contexts =
 971       script_context_set_.OnExtensionUnloaded(id);
 972   for (ScriptContextSet::ContextSet::iterator it = removed_contexts.begin();
 973        it != removed_contexts.end();
 974        ++it) {
 975     request_sender_->InvalidateSource(*it);
 976   }
 977
 978   // Update the available bindings for the remaining contexts. These may have
 979   // changed if an externally_connectable extension is unloaded and a webpage
 980   // is no longer accessible.
 981   UpdateBindings("");
 982
 983   // Invalidates the messages map for the extension in case the extension is
 984   // reloaded with a new messages map.
 985   EraseL10nMessagesMap(id);
 986
 987   // We don't do anything with existing platform-app stylesheets. They will
 988   // stay resident, but the URL pattern corresponding to the unloaded
 989   // extension's URL just won't match anything anymore.
 990 }
 991
 992 void Dispatcher::OnUpdatePermissions(
 993     const ExtensionMsg_UpdatePermissions_Params& params) {
 994   const Extension* extension = extensions_.GetByID(params.extension_id);
 995   if (!extension)
 996     return;
 997
 998   scoped_refptr<const PermissionSet> active =
 999       params.active_permissions.ToPermissionSet();
1000   scoped_refptr<const PermissionSet> withheld =
1001       params.withheld_permissions.ToPermissionSet();
1002
1003   if (is_webkit_initialized_) {
1004     UpdateOriginPermissions(
1005         extension,
1006         extension->permissions_data()->GetEffectiveHostPermissions(),
1007         active->effective_hosts());
1008   }
1009
1010   extension->permissions_data()->SetPermissions(active, withheld);
1011   UpdateBindings(extension->id());
1012 }
1013
1014 void Dispatcher::OnUpdateTabSpecificPermissions(
1015     const GURL& url,
1016     int tab_id,
1017     const std::string& extension_id,
1018     const URLPatternSet& origin_set) {
1019   delegate_->UpdateTabSpecificPermissions(
1020       this, url, tab_id, extension_id, origin_set);
1021 }
1022
1023 void Dispatcher::OnUsingWebRequestAPI(bool webrequest_used) {
1024   webrequest_used_ = webrequest_used;
1025 }
1026
1027 void Dispatcher::OnUserScriptsUpdated(
1028       const std::set<std::string>& changed_extensions,
1029       const std::vector<UserScript*>& scripts) {
1030   UpdateActiveExtensions();
1031 }
1032
1033 void Dispatcher::UpdateActiveExtensions() {
1034   std::set<std::string> active_extensions = active_extension_ids_;
1035   user_script_set_manager_->GetAllActiveExtensionIds(&active_extensions);
1036   delegate_->OnActiveExtensionsUpdated(active_extensions);
1037 }
1038
1039 void Dispatcher::InitOriginPermissions(const Extension* extension) {
1040   delegate_->InitOriginPermissions(extension,
1041                                    IsExtensionActive(extension->id()));
1042   UpdateOriginPermissions(
1043       extension,
1044       URLPatternSet(),  // No old permissions.
1045       extension->permissions_data()->GetEffectiveHostPermissions());
1046 }
1047
1048 void Dispatcher::UpdateOriginPermissions(
1049     const Extension* extension,
1050     const URLPatternSet& old_patterns,
1051     const URLPatternSet& new_patterns) {
1052   static const char* kSchemes[] = {
1053       url::kHttpScheme,
1054       url::kHttpsScheme,
1055       url::kFileScheme,
1056       content::kChromeUIScheme,
1057       url::kFtpScheme,
1058   };
1059   for (size_t i = 0; i < arraysize(kSchemes); ++i) {
1060     const char* scheme = kSchemes[i];
1061     // Remove all old patterns...
1062     for (URLPatternSet::const_iterator pattern = old_patterns.begin();
1063          pattern != old_patterns.end(); ++pattern) {
1064       if (pattern->MatchesScheme(scheme)) {
1065         WebSecurityPolicy::removeOriginAccessWhitelistEntry(
1066             extension->url(),
1067             WebString::fromUTF8(scheme),
1068             WebString::fromUTF8(pattern->host()),
1069             pattern->match_subdomains());
1070       }
1071     }
1072     // ...And add the new ones.
1073     for (URLPatternSet::const_iterator pattern = new_patterns.begin();
1074          pattern != new_patterns.end(); ++pattern) {
1075       if (pattern->MatchesScheme(scheme)) {
1076         WebSecurityPolicy::addOriginAccessWhitelistEntry(
1077             extension->url(),
1078             WebString::fromUTF8(scheme),
1079             WebString::fromUTF8(pattern->host()),
1080             pattern->match_subdomains());
1081       }
1082     }
1083   }
1084 }
1085
1086 void Dispatcher::EnableCustomElementWhiteList() {
1087   blink::WebCustomElement::addEmbedderCustomElementName("appplugin");
1088   blink::WebCustomElement::addEmbedderCustomElementName("appview");
1089   blink::WebCustomElement::addEmbedderCustomElementName("browserplugin");
1090   blink::WebCustomElement::addEmbedderCustomElementName("extensionoptions");
1091   blink::WebCustomElement::addEmbedderCustomElementName(
1092       "extensionoptionsplugin");
1093   blink::WebCustomElement::addEmbedderCustomElementName("webview");
1094 }
1095
1096 void Dispatcher::UpdateBindings(const std::string& extension_id) {
1097   script_context_set().ForEach(extension_id,
1098                                base::Bind(&Dispatcher::UpdateBindingsForContext,
1099                                           base::Unretained(this)));
1100 }
1101
1102 void Dispatcher::UpdateBindingsForContext(ScriptContext* context) {
1103   v8::HandleScope handle_scope(context->isolate());
1104   v8::Context::Scope context_scope(context->v8_context());
1105
1106   // TODO(kalman): Make the bindings registration have zero overhead then run
1107   // the same code regardless of context type.
1108   switch (context->context_type()) {
1109     case Feature::UNSPECIFIED_CONTEXT:
1110     case Feature::WEB_PAGE_CONTEXT:
1111     case Feature::BLESSED_WEB_PAGE_CONTEXT: {
1112       // Web page context; it's too expensive to run the full bindings code.
1113       // Hard-code that the app and webstore APIs are available...
1114       if (context->GetAvailability("app").is_available())
1115         RegisterBinding("app", context);
1116
1117       if (context->GetAvailability("webstore").is_available())
1118         RegisterBinding("webstore", context);
1119
1120       // ... and that the runtime API might be available if any extension can
1121       // connect to it.
1122       bool runtime_is_available = false;
1123       for (ExtensionSet::const_iterator it = extensions_.begin();
1124            it != extensions_.end();
1125            ++it) {
1126         ExternallyConnectableInfo* info =
1127             static_cast<ExternallyConnectableInfo*>(
1128                 (*it)->GetManifestData(manifest_keys::kExternallyConnectable));
1129         if (info && info->matches.MatchesURL(context->GetURL())) {
1130           runtime_is_available = true;
1131           break;
1132         }
1133       }
1134       if (runtime_is_available)
1135         RegisterBinding("runtime", context);
1136       break;
1137     }
1138
1139     case Feature::BLESSED_EXTENSION_CONTEXT:
1140     case Feature::UNBLESSED_EXTENSION_CONTEXT:
1141     case Feature::CONTENT_SCRIPT_CONTEXT:
1142     case Feature::WEBUI_CONTEXT: {
1143       // Extension context; iterate through all the APIs and bind the available
1144       // ones.
1145       const FeatureProvider* api_feature_provider =
1146           FeatureProvider::GetAPIFeatures();
1147       const std::vector<std::string>& apis =
1148           api_feature_provider->GetAllFeatureNames();
1149       for (std::vector<std::string>::const_iterator it = apis.begin();
1150            it != apis.end();
1151            ++it) {
1152         const std::string& api_name = *it;
1153         Feature* feature = api_feature_provider->GetFeature(api_name);
1154         DCHECK(feature);
1155
1156         // Internal APIs are included via require(api_name) from internal code
1157         // rather than chrome[api_name].
1158         if (feature->IsInternal())
1159           continue;
1160
1161         // If this API has a parent feature (and isn't marked 'noparent'),
1162         // then this must be a function or event, so we should not register.
1163         if (api_feature_provider->GetParent(feature) != NULL)
1164           continue;
1165
1166         // Skip chrome.test if this isn't a test.
1167         if (api_name == "test" &&
1168             !CommandLine::ForCurrentProcess()->HasSwitch(
1169                 ::switches::kTestType)) {
1170           continue;
1171         }
1172
1173         if (context->IsAnyFeatureAvailableToContext(*feature))
1174           RegisterBinding(api_name, context);
1175       }
1176       break;
1177     }
1178   }
1179 }
1180
1181 void Dispatcher::RegisterBinding(const std::string& api_name,
1182                                  ScriptContext* context) {
1183   std::string bind_name;
1184   v8::Handle<v8::Object> bind_object =
1185       GetOrCreateBindObjectIfAvailable(api_name, &bind_name, context);
1186
1187   // Empty if the bind object failed to be created, probably because the
1188   // extension overrode chrome with a non-object, e.g. window.chrome = true.
1189   if (bind_object.IsEmpty())
1190     return;
1191
1192   v8::Local<v8::String> v8_api_name =
1193       v8::String::NewFromUtf8(context->isolate(), api_name.c_str());
1194   if (bind_object->HasRealNamedProperty(v8_api_name)) {
1195     // The bind object may already have the property if the API has been
1196     // registered before (or if the extension has put something there already,
1197     // but, whatevs).
1198     //
1199     // In the former case, we need to re-register the bindings for the APIs
1200     // which the extension now has permissions for (if any), but not touch any
1201     // others so that we don't destroy state such as event listeners.
1202     //
1203     // TODO(kalman): Only register available APIs to make this all moot.
1204     if (bind_object->HasRealNamedCallbackProperty(v8_api_name))
1205       return;  // lazy binding still there, nothing to do
1206     if (bind_object->Get(v8_api_name)->IsObject())
1207       return;  // binding has already been fully installed
1208   }
1209
1210   ModuleSystem* module_system = context->module_system();
1211   if (!source_map_.Contains(api_name)) {
1212     module_system->RegisterNativeHandler(
1213         api_name,
1214         scoped_ptr<NativeHandler>(new BindingGeneratingNativeHandler(
1215             module_system, api_name, "binding")));
1216     module_system->SetNativeLazyField(
1217         bind_object, bind_name, api_name, "binding");
1218   } else {
1219     module_system->SetLazyField(bind_object, bind_name, api_name, "binding");
1220   }
1221 }
1222
1223 // NOTE: please use the naming convention "foo_natives" for these.
1224 void Dispatcher::RegisterNativeHandlers(ModuleSystem* module_system,
1225                                         ScriptContext* context) {
1226   RegisterNativeHandlers(module_system,
1227                          context,
1228                          this,
1229                          request_sender_.get(),
1230                          v8_schema_registry_.get());
1231   const Extension* extension = context->extension();
1232   int manifest_version = extension ? extension->manifest_version() : 1;
1233   bool send_request_disabled =
1234       (extension && Manifest::IsUnpackedLocation(extension->location()) &&
1235        BackgroundInfo::HasLazyBackgroundPage(extension));
1236   module_system->RegisterNativeHandler(
1237       "process",
1238       scoped_ptr<NativeHandler>(new ProcessInfoNativeHandler(
1239           context,
1240           context->GetExtensionID(),
1241           context->GetContextTypeDescription(),
1242           ExtensionsRendererClient::Get()->IsIncognitoProcess(),
1243           manifest_version,
1244           send_request_disabled)));
1245
1246   delegate_->RegisterNativeHandlers(this, module_system, context);
1247 }
1248
1249 void Dispatcher::PopulateSourceMap() {
1250   const std::vector<std::pair<std::string, int> > resources = GetJsResources();
1251   for (std::vector<std::pair<std::string, int> >::const_iterator resource =
1252            resources.begin();
1253        resource != resources.end();
1254        ++resource) {
1255     source_map_.RegisterSource(resource->first, resource->second);
1256   }
1257   delegate_->PopulateSourceMap(&source_map_);
1258 }
1259
1260 bool Dispatcher::IsWithinPlatformApp() {
1261   for (std::set<std::string>::iterator iter = active_extension_ids_.begin();
1262        iter != active_extension_ids_.end();
1263        ++iter) {
1264     const Extension* extension = extensions_.GetByID(*iter);
1265     if (extension && extension->is_platform_app())
1266       return true;
1267   }
1268   return false;
1269 }
1270
1271 // TODO(kalman): This is checking for the wrong thing, it should be checking if
1272 // the frame's security origin is unique. The extension sandbox directive is
1273 // checked for in extensions/common/manifest_handlers/csp_info.cc.
1274 bool Dispatcher::IsSandboxedPage(const GURL& url) const {
1275   if (url.SchemeIs(kExtensionScheme)) {
1276     const Extension* extension = extensions_.GetByID(url.host());
1277     if (extension) {
1278       return SandboxedPageInfo::IsSandboxedPage(extension, url.path());
1279     }
1280   }
1281   return false;
1282 }
1283
1284 Feature::Context Dispatcher::ClassifyJavaScriptContext(
1285     const Extension* extension,
1286     int extension_group,
1287     const GURL& url,
1288     const blink::WebSecurityOrigin& origin) {
1289   // WARNING: This logic must match ProcessMap::GetContextType, as much as
1290   // possible.
1291
1292   DCHECK_GE(extension_group, 0);
1293   if (extension_group == EXTENSION_GROUP_CONTENT_SCRIPTS) {
1294     return extension ?  // TODO(kalman): when does this happen?
1295                Feature::CONTENT_SCRIPT_CONTEXT
1296                      : Feature::UNSPECIFIED_CONTEXT;
1297   }
1298
1299   // We have an explicit check for sandboxed pages before checking whether the
1300   // extension is active in this process because:
1301   // 1. Sandboxed pages run in the same process as regular extension pages, so
1302   //    the extension is considered active.
1303   // 2. ScriptContext creation (which triggers bindings injection) happens
1304   //    before the SecurityContext is updated with the sandbox flags (after
1305   //    reading the CSP header), so the caller can't check if the context's
1306   //    security origin is unique yet.
1307   if (IsSandboxedPage(url))
1308     return Feature::WEB_PAGE_CONTEXT;
1309
1310   if (extension && IsExtensionActive(extension->id())) {
1311     // |extension| is active in this process, but it could be either a true
1312     // extension process or within the extent of a hosted app. In the latter
1313     // case this would usually be considered a (blessed) web page context,
1314     // unless the extension in question is a component extension, in which case
1315     // we cheat and call it blessed.
1316     return (extension->is_hosted_app() &&
1317             extension->location() != Manifest::COMPONENT)
1318                ? Feature::BLESSED_WEB_PAGE_CONTEXT
1319                : Feature::BLESSED_EXTENSION_CONTEXT;
1320   }
1321
1322   // TODO(kalman): This isUnique() check is wrong, it should be performed as
1323   // part of IsSandboxedPage().
1324   if (!origin.isUnique() && extensions_.ExtensionBindingsAllowed(url)) {
1325     if (!extension)  // TODO(kalman): when does this happen?
1326       return Feature::UNSPECIFIED_CONTEXT;
1327     return extension->is_hosted_app() ? Feature::BLESSED_WEB_PAGE_CONTEXT
1328                                       : Feature::UNBLESSED_EXTENSION_CONTEXT;
1329   }
1330
1331   if (!url.is_valid())
1332     return Feature::UNSPECIFIED_CONTEXT;
1333
1334   if (url.SchemeIs(content::kChromeUIScheme))
1335     return Feature::WEBUI_CONTEXT;
1336
1337   return Feature::WEB_PAGE_CONTEXT;
1338 }
1339
1340 v8::Handle<v8::Object> Dispatcher::GetOrCreateObject(
1341     const v8::Handle<v8::Object>& object,
1342     const std::string& field,
1343     v8::Isolate* isolate) {
1344   v8::Handle<v8::String> key = v8::String::NewFromUtf8(isolate, field.c_str());
1345   // If the object has a callback property, it is assumed it is an unavailable
1346   // API, so it is safe to delete. This is checked before GetOrCreateObject is
1347   // called.
1348   if (object->HasRealNamedCallbackProperty(key)) {
1349     object->Delete(key);
1350   } else if (object->HasRealNamedProperty(key)) {
1351     v8::Handle<v8::Value> value = object->Get(key);
1352     CHECK(value->IsObject());
1353     return v8::Handle<v8::Object>::Cast(value);
1354   }
1355
1356   v8::Handle<v8::Object> new_object = v8::Object::New(isolate);
1357   object->Set(key, new_object);
1358   return new_object;
1359 }
1360
1361 v8::Handle<v8::Object> Dispatcher::GetOrCreateBindObjectIfAvailable(
1362     const std::string& api_name,
1363     std::string* bind_name,
1364     ScriptContext* context) {
1365   std::vector<std::string> split;
1366   base::SplitString(api_name, '.', &split);
1367
1368   v8::Handle<v8::Object> bind_object;
1369
1370   // Check if this API has an ancestor. If the API's ancestor is available and
1371   // the API is not available, don't install the bindings for this API. If
1372   // the API is available and its ancestor is not, delete the ancestor and
1373   // install the bindings for the API. This is to prevent loading the ancestor
1374   // API schema if it will not be needed.
1375   //
1376   // For example:
1377   //  If app is available and app.window is not, just install app.
1378   //  If app.window is available and app is not, delete app and install
1379   //  app.window on a new object so app does not have to be loaded.
1380   const FeatureProvider* api_feature_provider =
1381       FeatureProvider::GetAPIFeatures();
1382   std::string ancestor_name;
1383   bool only_ancestor_available = false;
1384
1385   for (size_t i = 0; i < split.size() - 1; ++i) {
1386     ancestor_name += (i ? "." : "") + split[i];
1387     if (api_feature_provider->GetFeature(ancestor_name) &&
1388         context->GetAvailability(ancestor_name).is_available() &&
1389         !context->GetAvailability(api_name).is_available()) {
1390       only_ancestor_available = true;
1391       break;
1392     }
1393
1394     if (bind_object.IsEmpty()) {
1395       bind_object = AsObjectOrEmpty(GetOrCreateChrome(context));
1396       if (bind_object.IsEmpty())
1397         return v8::Handle<v8::Object>();
1398     }
1399     bind_object = GetOrCreateObject(bind_object, split[i], context->isolate());
1400   }
1401
1402   if (only_ancestor_available)
1403     return v8::Handle<v8::Object>();
1404
1405   if (bind_name)
1406     *bind_name = split.back();
1407
1408   return bind_object.IsEmpty() ? AsObjectOrEmpty(GetOrCreateChrome(context))
1409                                : bind_object;
1410 }
1411
1412 }  // namespace extensions