blob: 8a04ef15f52df7b3d2e09a1e480c1d137ad8aa82 [file] [log] [blame]
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/renderer/native_extension_bindings_system.h"
#include "base/callback.h"
#include "base/command_line.h"
#include "base/memory/ptr_util.h"
#include "content/public/child/worker_thread.h"
#include "content/public/common/console_message_level.h"
#include "content/public/common/content_switches.h"
#include "extensions/common/constants.h"
#include "extensions/common/event_filtering_info.h"
#include "extensions/common/extension_api.h"
#include "extensions/common/extension_messages.h"
#include "extensions/common/features/feature_provider.h"
#include "extensions/renderer/api_activity_logger.h"
#include "extensions/renderer/bindings/api_binding_bridge.h"
#include "extensions/renderer/bindings/api_binding_hooks.h"
#include "extensions/renderer/bindings/api_binding_js_util.h"
#include "extensions/renderer/chrome_setting.h"
#include "extensions/renderer/console.h"
#include "extensions/renderer/content_setting.h"
#include "extensions/renderer/declarative_content_hooks_delegate.h"
#include "extensions/renderer/extension_frame_helper.h"
#include "extensions/renderer/ipc_message_sender.h"
#include "extensions/renderer/module_system.h"
#include "extensions/renderer/script_context.h"
#include "extensions/renderer/script_context_set.h"
#include "extensions/renderer/storage_area.h"
#include "extensions/renderer/web_request_hooks.h"
#include "extensions/renderer/worker_thread_dispatcher.h"
#include "gin/converter.h"
#include "gin/handle.h"
#include "gin/per_context_data.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebLocalFrame.h"
namespace extensions {
namespace {
const char kBindingsSystemPerContextKey[] = "extension_bindings_system";
// Returns true if the given |api| is a "prefixed" api of the |root_api|; that
// is, if the api begins with the root.
// For example, 'app.runtime' is a prefixed api of 'app'.
// This is designed to be used as a utility when iterating over a sorted map, so
// assumes that |api| is lexicographically greater than |root_api|.
bool IsPrefixedAPI(base::StringPiece api, base::StringPiece root_api) {
DCHECK_NE(api, root_api);
DCHECK_GT(api, root_api);
return base::StartsWith(api, root_api, base::CompareCase::SENSITIVE) &&
api[root_api.size()] == '.';
// Returns the first different level of the api specification between the given
// |api_name| and |reference|. For an api_name of 'app.runtime' and a reference
// of 'app', this returns 'app.runtime'. For an api_name of
// 'cast.streaming.session' and a reference of 'cast', this returns
// 'cast.streaming'. If reference is empty, this simply returns the first layer;
// so given 'app.runtime' and no reference, this returns 'app'.
base::StringPiece GetFirstDifferentAPIName(
base::StringPiece api_name,
base::StringPiece reference) {
base::StringPiece::size_type dot =
api_name.find('.', reference.empty() ? 0 : reference.size() + 1);
if (dot == base::StringPiece::npos)
return api_name;
return api_name.substr(0, dot);
struct BindingsSystemPerContextData : public base::SupportsUserData::Data {
base::WeakPtr<NativeExtensionBindingsSystem> bindings_system)
: bindings_system(bindings_system) {}
~BindingsSystemPerContextData() override {}
v8::Global<v8::Object> api_object;
v8::Global<v8::Object> internal_apis;
base::WeakPtr<NativeExtensionBindingsSystem> bindings_system;
// If a 'chrome' property exists on the context's global and is an object,
// returns that.
// If a 'chrome' property exists but isn't an object, returns an empty Local.
// If no 'chrome' property exists (or is undefined), creates a new
// object, assigns it to Global().chrome, and returns it.
v8::Local<v8::Object> GetOrCreateChrome(v8::Local<v8::Context> context) {
// Ensure that the creation context for any new chrome object is |context|.
v8::Context::Scope context_scope(context);
// TODO(devlin): This is a little silly. We expect that this may do the wrong
// thing if the window has set some other 'chrome' (as in the case of script
// doing ' = true'), but we don't really handle it. It could also
// throw exceptions or have unintended side effects.
// On the one hand, anyone writing that code is probably asking for trouble.
// On the other, it'd be nice to avoid. I wonder if we can?
v8::Local<v8::String> chrome_string =
gin::StringToSymbol(context->GetIsolate(), "chrome");
v8::Local<v8::Value> chrome_value;
if (!context->Global()->Get(context, chrome_string).ToLocal(&chrome_value))
return v8::Local<v8::Object>();
v8::Local<v8::Object> chrome_object;
if (chrome_value->IsUndefined()) {
chrome_object = v8::Object::New(context->GetIsolate());
v8::Maybe<bool> success =
context->Global()->CreateDataProperty(context, chrome_string,
if (!success.IsJust() || !success.FromJust())
return v8::Local<v8::Object>();
} else if (chrome_value->IsObject()) {
v8::Local<v8::Object> obj = chrome_value.As<v8::Object>();
// The creation context of the `chrome` property could be different if a
// different context (such as the parent of an about:blank iframe) assigned
// it. Since in this case we know that the chrome object is not the one we
// created, do not use it for bindings. This also avoids weirdness of having
// bindings created in one context stored on a chrome object from another.
// TODO(devlin): There might be a way of detecting if the browser created
// the chrome object. For instance, we could add a v8::Private to the
// chrome object we construct, and check if it's present. Unfortunately, we
// need to a) track down each place we create the chrome object (it's not
// just in extensions) and also see how much that would break.
if (obj->CreationContext() == context)
chrome_object = obj;
return chrome_object;
BindingsSystemPerContextData* GetBindingsDataFromContext(
v8::Local<v8::Context> context) {
gin::PerContextData* per_context_data = gin::PerContextData::From(context);
if (!per_context_data)
return nullptr; // Context is shutting down.
auto* data = static_cast<BindingsSystemPerContextData*>(
if (!data->bindings_system) {
NOTREACHED() << "Context outlived bindings system.";
return nullptr;
return data;
// Returns the ScriptContext associated with the given v8::Context.
// TODO(devlin): Does this belong here, or should it be curried in as a
// callback? This is the only place we have knowledge of worker vs. non-worker
// threads here.
ScriptContext* GetScriptContext(v8::Local<v8::Context> context) {
ScriptContext* script_context =
content::WorkerThread::GetCurrentId() > 0
? WorkerThreadDispatcher::GetScriptContext()
: ScriptContextSet::GetContextByV8Context(context);
DCHECK(script_context->v8_context() == context);
return script_context;
// Handler for calling safely into JS.
void CallJsFunction(v8::Local<v8::Function> function,
v8::Local<v8::Context> context,
int argc,
v8::Local<v8::Value> argv[]) {
ScriptContext* script_context = GetScriptContext(context);
script_context->SafeCallFunction(function, argc, argv);
v8::Global<v8::Value> CallJsFunctionSync(v8::Local<v8::Function> function,
v8::Local<v8::Context> context,
int argc,
v8::Local<v8::Value> argv[]) {
bool did_complete = false;
v8::Global<v8::Value> result;
auto callback = base::Bind([](
v8::Isolate* isolate,
bool* did_complete_out,
v8::Global<v8::Value>* result_out,
const std::vector<v8::Local<v8::Value>>& results) {
*did_complete_out = true;
// The locals are released after the callback is executed, so we need to
// grab a persistent handle.
if (!results.empty() && !results[0].IsEmpty())
result_out->Reset(isolate, results[0]);
}, base::Unretained(context->GetIsolate()),
base::Unretained(&did_complete), base::Unretained(&result));
ScriptContext* script_context = GetScriptContext(context);
script_context->SafeCallFunction(function, argc, argv, callback);
CHECK(did_complete) << "expected script to execute synchronously";
return result;
void AddConsoleError(v8::Local<v8::Context> context, const std::string& error) {
ScriptContext* script_context = GetScriptContext(context);
console::AddMessage(script_context, content::CONSOLE_MESSAGE_LEVEL_ERROR,
// Returns the API schema indicated by |api_name|.
const base::DictionaryValue& GetAPISchema(const std::string& api_name) {
const base::DictionaryValue* schema =
CHECK(schema) << api_name;
return *schema;
// Returns true if the feature specified by |name| is available to the given
// |context|.
bool IsAPIFeatureAvailable(v8::Local<v8::Context> context,
const std::string& name) {
ScriptContext* script_context = GetScriptContext(context);
return script_context->GetAvailability(name).is_available();
// Instantiates the binding object for the given |name|. |name| must specify a
// specific feature.
v8::Local<v8::Object> CreateRootBinding(v8::Local<v8::Context> context,
ScriptContext* script_context,
const std::string& name,
APIBindingsSystem* bindings_system) {
APIBindingHooks* hooks = nullptr;
v8::Local<v8::Object> binding_object =
bindings_system->CreateAPIInstance(name, context, &hooks);
gin::Handle<APIBindingBridge> bridge_handle = gin::CreateHandle(
new APIBindingBridge(hooks, context, binding_object,
v8::Local<v8::Value> native_api_bridge = bridge_handle.ToV8();
return binding_object;
// Creates the binding object for the given |root_name|. This can be
// complicated, since APIs may have prefixed names, like 'app.runtime' or
// 'system.cpu'. This method accepts the first name (i.e., the key that we are
// looking for on the chrome object, such as 'app') and returns the fully
// instantiated binding, including prefixed APIs. That is, given 'app', this
// will instantiate 'app', 'app.runtime', and 'app.window'.
// NOTE(devlin): We could do the prefixed apis lazily; however, it's not clear
// how much of a win it would be. It's less overhead here than in the general
// case (instantiating a handful of APIs instead of all of them), and it's more
// likely they will be used (since the extension is already accessing the
// parent).
// TODO(devlin): We should be creating ObjectTemplates for these so that we only
// do this work once. APIBindings (for the single API) already do this.
v8::Local<v8::Object> CreateFullBinding(
v8::Local<v8::Context> context,
ScriptContext* script_context,
APIBindingsSystem* bindings_system,
const FeatureProvider* api_feature_provider,
const std::string& root_name) {
const FeatureMap& features = api_feature_provider->GetAllFeatures();
auto lower = features.lower_bound(root_name);
DCHECK(lower != features.end());
// Some bindings have a prefixed name, like app.runtime, where 'app' and
// 'app.runtime' are, in fact, separate APIs. It's also possible for a
// context to have access to 'app.runtime', but not to 'app'. For this, we
// either instantiate the 'app' binding fully (if the context has access), or
// else use an empty object (so we can still instantiate 'app.runtime').
v8::Local<v8::Object> root_binding;
if (lower->first == root_name) {
if (script_context->IsAnyFeatureAvailableToContext(
*lower->second, CheckAliasStatus::NOT_ALLOWED)) {
root_binding = CreateRootBinding(context, script_context, root_name,
// Look for any bindings that would be on the same object. Any of these would
// start with the same base name (e.g. 'app') + '.' (since '.' is < x for any
// isalpha(x)).
std::string upper = root_name + static_cast<char>('.' + 1);
base::StringPiece last_binding_name;
// The following loop is a little painful because we have crazy binding names
// and syntaxes. The way this works is as follows:
// Look at each feature after the root feature we passed in. If there exists
// a (non-child) feature with a prefixed name, create the full binding for
// the object that the next feature is on. Then, iterate past any features
// already instantiated by that, and continue until there are no more features
// prefixed by the root API.
// As a concrete example, we can look at the cast APIs (cast and
// cast.streaming.*)
// Start with vanilla 'cast', and instantiate that.
// Then iterate over features, and see 'cast.streaming.receiverSession'.
// 'cast.streaming.receiverSession' is a prefixed API of 'cast', but we find
// the first level of difference, which is 'cast.streaming', and instantiate
// that object completely (through recursion).
// The next feature is 'cast.streaming.rtpStream', but this is a prefixed API
// of 'cast.streaming', which we just instantiated completely (including
// 'cast.streaming.rtpStream'), so we continue.
// Iterate until all cast.* features are created.
// TODO(devlin): This is bonkers, but what's the better way? We could extract
// this out to be a more readable Visitor implementation, but is it worth it
// for this one place? Ideally, we'd have a less convoluted feature
// representation (some kind of tree would make this trivial), but for now, we
// have strings.
// On the upside, most APIs are not prefixed at all, and this loop is never
// entered.
for (auto iter = lower; iter != features.end() && iter->first < upper;
++iter) {
if (iter->second->IsInternal())
if (IsPrefixedAPI(iter->first, last_binding_name)) {
// Instantiating |last_binding_name| must have already instantiated
// iter->first.
// If this API has a parent feature (and isn't marked 'noparent'),
// then this must be a function or event, so we should not register.
if (api_feature_provider->GetParent(iter->second.get()) != nullptr)
base::StringPiece binding_name =
GetFirstDifferentAPIName(iter->first, root_name);
v8::Local<v8::Object> nested_binding =
CreateFullBinding(context, script_context, bindings_system,
api_feature_provider, binding_name.as_string());
// It's possible that we don't create a binding if no features or
// prefixed features are available to the context.
if (nested_binding.IsEmpty())
if (root_binding.IsEmpty())
root_binding = v8::Object::New(context->GetIsolate());
// The nested api name contains a '.', e.g. 'app.runtime', but we want to
// expose it on the object simply as 'runtime'.
// Cache the last_binding_name now before mangling it.
last_binding_name = binding_name;
DCHECK_NE(base::StringPiece::npos, binding_name.rfind('.'));
base::StringPiece accessor_name =
binding_name.substr(binding_name.rfind('.') + 1);
v8::Local<v8::String> nested_name =
gin::StringToSymbol(context->GetIsolate(), accessor_name);
v8::Maybe<bool> success =
root_binding->CreateDataProperty(context, nested_name, nested_binding);
if (!success.IsJust() || !success.FromJust())
return v8::Local<v8::Object>();
return root_binding;
} // namespace
std::unique_ptr<IPCMessageSender> ipc_message_sender)
: ipc_message_sender_(std::move(ipc_message_sender)),
weak_factory_(this) {
base::Bind(&ContentSetting::Create, base::Bind(&CallJsFunction)));
NativeExtensionBindingsSystem::~NativeExtensionBindingsSystem() {}
void NativeExtensionBindingsSystem::DidCreateScriptContext(
ScriptContext* context) {
v8::Isolate* isolate = context->isolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> v8_context = context->v8_context();
gin::PerContextData* per_context_data = gin::PerContextData::From(v8_context);
auto data = base::MakeUnique<BindingsSystemPerContextData>(
per_context_data->SetUserData(kBindingsSystemPerContextKey, std::move(data));
if (get_internal_api_.IsEmpty()) {
isolate, v8::FunctionTemplate::New(
isolate, &NativeExtensionBindingsSystem::GetInternalAPI,
v8::Local<v8::Value>(), v8::Local<v8::Signature>(), 0,
// Note: it's a shame we can't delay this (until, say, we knew an API would
// actually be used), but it's needed for some of our crazier hooks, like
// web/guest view.
void NativeExtensionBindingsSystem::WillReleaseScriptContext(
ScriptContext* context) {
v8::HandleScope handle_scope(context->isolate());
void NativeExtensionBindingsSystem::UpdateBindingsForContext(
ScriptContext* context) {
v8::Isolate* isolate = context->isolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> v8_context = context->v8_context();
v8::Local<v8::Object> chrome = GetOrCreateChrome(v8_context);
if (chrome.IsEmpty())
auto set_accessor = [chrome, isolate,
v8_context](base::StringPiece accessor_name) {
v8::Local<v8::String> api_name =
gin::StringToSymbol(isolate, accessor_name);
v8::Maybe<bool> success = chrome->SetAccessor(
v8_context, api_name, &BindingAccessor, nullptr, api_name);
return success.IsJust() && success.FromJust();
bool is_webpage = false;
switch (context->context_type()) {
case Feature::WEB_PAGE_CONTEXT:
is_webpage = true;
// Intentional fallthrough.
case Feature::WEBUI_CONTEXT:
is_webpage = false;
if (is_webpage) {
// Hard-code registration of any APIs that are exposed to webpage-like
// contexts, because it's more expensive to iterate over all the existing
// features when only a handful could ever be available.
// All of the same permission checks will still apply.
// TODO(devlin): It could be interesting to apply this same logic to all
// context types, especially on a given platform. Something to think about
// for when we generate features.
for (const char* feature_name : kWebAvailableFeatures) {
if (context->GetAvailability(feature_name).is_available() &&
!set_accessor(feature_name)) {
LOG(ERROR) << "Failed to create API on Chrome object.";
// Runtime is special (see IsRuntimeAvailableToContext()).
if (IsRuntimeAvailableToContext(context) && !set_accessor("runtime"))
LOG(ERROR) << "Failed to create API on Chrome object.";
const FeatureProvider* api_feature_provider =
base::StringPiece last_accessor;
for (const auto& map_entry : api_feature_provider->GetAllFeatures()) {
// If we've already set up an accessor for the immediate property of the
// chrome object, we don't need to do more.
if (IsPrefixedAPI(map_entry.first, last_accessor))
// Internal APIs are included via require(api_name) from internal code
// rather than chrome[api_name].
if (map_entry.second->IsInternal())
// If this API has a parent feature (and isn't marked 'noparent'),
// then this must be a function or event, so we should not register.
if (api_feature_provider->GetParent(map_entry.second.get()) != nullptr)
// Skip chrome.test if this isn't a test.
if (map_entry.first == "test" &&
::switches::kTestType)) {
// TODO(devlin): UpdateBindingsForContext can be called during context
// creation, but also when e.g. permissions change. We need to be checking
// for whether or not the API already exists on the object as well as
// if we need to remove any existing APIs.
if (!context->IsAnyFeatureAvailableToContext(*map_entry.second,
// We've found an API that's available to the extension. Normally, we will
// expose this under the name of the feature (e.g., 'tabs'), but in some
// cases, this will be a prefixed API, such as 'app.runtime'. Find what the
// property on the chrome object is named, and use that. So in the case of
// 'app.runtime', we surface a getter for simply 'app'.
base::StringPiece accessor_name =
GetFirstDifferentAPIName(map_entry.first, base::StringPiece());
last_accessor = accessor_name;
if (!set_accessor(accessor_name)) {
LOG(ERROR) << "Failed to create API on Chrome object.";
void NativeExtensionBindingsSystem::DispatchEventInContext(
const std::string& event_name,
const base::ListValue* event_args,
const EventFilteringInfo* filtering_info,
ScriptContext* context) {
v8::HandleScope handle_scope(context->isolate());
v8::Context::Scope context_scope(context->v8_context());
api_system_.FireEventInContext(event_name, context->v8_context(), *event_args,
bool NativeExtensionBindingsSystem::HasEventListenerInContext(
const std::string& event_name,
ScriptContext* context) {
v8::HandleScope handle_scope(context->isolate());
return api_system_.event_handler()->HasListenerForEvent(
event_name, context->v8_context());
void NativeExtensionBindingsSystem::HandleResponse(
int request_id,
bool success,
const base::ListValue& response,
const std::string& error) {
// Some API calls result in failure, but don't set an error. Use a generic and
// unhelpful error string.
// TODO(devlin): Track these down and fix them. See
request_id, response,
!success && error.empty() ? "Unknown error." : error);
RequestSender* NativeExtensionBindingsSystem::GetRequestSender() {
return nullptr;
IPCMessageSender* NativeExtensionBindingsSystem::GetIPCMessageSender() {
return ipc_message_sender_.get();
v8::Local<v8::Object> NativeExtensionBindingsSystem::GetAPIObjectForTesting(
ScriptContext* context,
const std::string& api_name) {
return GetAPIHelper(context->v8_context(),
gin::StringToSymbol(context->isolate(), api_name));
void NativeExtensionBindingsSystem::BindingAccessor(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
v8::Isolate* isolate = info.GetIsolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> context = info.Holder()->CreationContext();
// We use info.Data() to store a real name here instead of using the provided
// one to handle any weirdness from the caller (non-existent strings, etc).
v8::Local<v8::String> api_name = info.Data().As<v8::String>();
v8::Local<v8::Object> binding = GetAPIHelper(context, api_name);
if (!binding.IsEmpty())
// static
v8::Local<v8::Object> NativeExtensionBindingsSystem::GetAPIHelper(
v8::Local<v8::Context> context,
v8::Local<v8::String> api_name) {
BindingsSystemPerContextData* data = GetBindingsDataFromContext(context);
if (!data)
return v8::Local<v8::Object>();
v8::Isolate* isolate = context->GetIsolate();
v8::Local<v8::Object> apis;
if (data->api_object.IsEmpty()) {
apis = v8::Object::New(isolate);
data->api_object = v8::Global<v8::Object>(isolate, apis);
} else {
apis = data->api_object.Get(isolate);
v8::Maybe<bool> has_property = apis->HasRealNamedProperty(context, api_name);
if (!has_property.IsJust())
return v8::Local<v8::Object>();
if (has_property.FromJust()) {
v8::Local<v8::Value> value =
apis->GetRealNamedProperty(context, api_name).ToLocalChecked();
return value.As<v8::Object>();
ScriptContext* script_context = GetScriptContext(context);
std::string api_name_string;
gin::Converter<std::string>::FromV8(isolate, api_name, &api_name_string));
v8::Local<v8::Object> root_binding = CreateFullBinding(
context, script_context, &data->bindings_system->api_system_,
FeatureProvider::GetAPIFeatures(), api_name_string);
if (root_binding.IsEmpty())
return v8::Local<v8::Object>();
v8::Maybe<bool> success =
apis->CreateDataProperty(context, api_name, root_binding);
if (!success.IsJust() || !success.FromJust())
return v8::Local<v8::Object>();
return root_binding;
v8::Local<v8::Object> NativeExtensionBindingsSystem::GetLastErrorParents(
v8::Local<v8::Context> context,
v8::Local<v8::Object>* secondary_parent) {
if (secondary_parent &&
IsAPIFeatureAvailable(context, "extension.lastError")) {
*secondary_parent = GetAPIHelper(
context, gin::StringToSymbol(context->GetIsolate(), "extension"));
return GetAPIHelper(context,
gin::StringToSymbol(context->GetIsolate(), "runtime"));
// static
void NativeExtensionBindingsSystem::GetInternalAPI(
const v8::FunctionCallbackInfo<v8::Value>& info) {
CHECK_EQ(1, info.Length());
v8::Isolate* isolate = info.GetIsolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> context = isolate->GetCurrentContext();
v8::Local<v8::String> v8_name = info[0].As<v8::String>();
BindingsSystemPerContextData* data = GetBindingsDataFromContext(context);
v8::Local<v8::Object> internal_apis;
if (data->internal_apis.IsEmpty()) {
internal_apis = v8::Object::New(isolate);
data->internal_apis.Reset(isolate, internal_apis);
} else {
internal_apis = data->internal_apis.Get(isolate);
v8::Maybe<bool> has_property =
internal_apis->HasOwnProperty(context, v8_name);
if (!has_property.IsJust())
if (has_property.FromJust()) {
// API was already instantiated.
internal_apis->GetRealNamedProperty(context, v8_name).ToLocalChecked());
std::string api_name = gin::V8ToString(info[0]);
const Feature* feature = FeatureProvider::GetAPIFeature(api_name);
ScriptContext* script_context = GetScriptContext(context);
if (!feature ||
*feature, CheckAliasStatus::NOT_ALLOWED)) {
// We don't need to go through CreateFullBinding here because internal APIs
// are always acquired through getInternalBinding and specified by full name,
// rather than through access on the chrome object. So we can just instantiate
// a binding keyed with any name, even a prefixed one (e.g.
// 'app.currentWindowInternal').
v8::Local<v8::Object> api_binding = CreateRootBinding(
context, script_context, api_name, &data->bindings_system->api_system_);
if (api_binding.IsEmpty())
v8::Maybe<bool> success =
internal_apis->CreateDataProperty(context, v8_name, api_binding);
if (!success.IsJust() || !success.FromJust())
void NativeExtensionBindingsSystem::SendRequest(
std::unique_ptr<APIRequestHandler::Request> request,
v8::Local<v8::Context> context) {
ScriptContext* script_context = GetScriptContext(context);
GURL url;
blink::WebLocalFrame* frame = script_context->web_frame();
if (frame && !frame->GetDocument().IsNull())
url = frame->GetDocument().Url();
url = script_context->url();
auto params = base::MakeUnique<ExtensionHostMsg_Request_Params>();
params->name = request->method_name;
params->extension_id = script_context->GetExtensionID();
params->source_url = url;
params->request_id = request->request_id;
params->has_callback = request->has_callback;
params->user_gesture = request->has_user_gesture;
// The IPC sender will update these members, if appropriate.
params->worker_thread_id = -1;
params->service_worker_version_id = kInvalidServiceWorkerVersionId;
ipc_message_sender_->SendRequestIPC(script_context, std::move(params),
void NativeExtensionBindingsSystem::OnEventListenerChanged(
const std::string& event_name,
binding::EventListenersChanged change,
const base::DictionaryValue* filter,
bool update_lazy_listeners,
v8::Local<v8::Context> context) {
ScriptContext* script_context = GetScriptContext(context);
// Note: Check context_type() first to avoid accessing ExtensionFrameHelper on
// a worker thread.
bool is_lazy =
update_lazy_listeners &&
(script_context->context_type() == Feature::SERVICE_WORKER_CONTEXT ||
// We only remove a lazy listener if the listener removal was triggered
// manually by the extension.
if (filter) { // Filtered event listeners.
if (change == binding::EventListenersChanged::HAS_LISTENERS) {
script_context, event_name, *filter, is_lazy);
} else {
DCHECK_EQ(binding::EventListenersChanged::NO_LISTENERS, change);
script_context, event_name, *filter, is_lazy);
} else { // Unfiltered event listeners.
if (change == binding::EventListenersChanged::HAS_LISTENERS) {
// TODO(devlin): The JS bindings code only adds one listener per extension
// per event per process, whereas this is one listener per context per
// event per process. Typically, this won't make a difference, but it
// could if there are multiple contexts for the same extension (e.g.,
// multiple frames). In that case, it would result in extra IPCs being
// sent. I'm not sure it's a big enough deal to warrant refactoring.
if (is_lazy) {
script_context, event_name);
} else {
DCHECK_EQ(binding::EventListenersChanged::NO_LISTENERS, change);
if (is_lazy) {
script_context, event_name);
void NativeExtensionBindingsSystem::GetJSBindingUtil(
v8::Local<v8::Context> context,
v8::Local<v8::Value>* binding_util_out) {
gin::Handle<APIBindingJSUtil> handle = gin::CreateHandle(
new APIBindingJSUtil(
api_system_.type_reference_map(), api_system_.request_handler(),
api_system_.event_handler(), api_system_.exception_handler(),
*binding_util_out = handle.ToV8();
} // namespace extensions