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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/renderer/v8_schema_registry.h"
#include <stddef.h>
#include <memory>
#include <utility>
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "base/values.h"
#include "content/public/renderer/v8_value_converter.h"
#include "extensions/common/extension_api.h"
#include "extensions/renderer/object_backed_native_handler.h"
#include "extensions/renderer/script_context.h"
#include "extensions/renderer/static_v8_external_one_byte_string_resource.h"
#include "extensions/renderer/v8_helpers.h"
#include "v8/include/v8-container.h"
#include "v8/include/v8-context.h"
#include "v8/include/v8-function-callback.h"
#include "v8/include/v8-isolate.h"
#include "v8/include/v8-json.h"
#include "v8/include/v8-microtask-queue.h"
#include "v8/include/v8-object.h"
#include "v8/include/v8-value.h"
using content::V8ValueConverter;
namespace extensions {
namespace {
// Recursively freezes every v8 object on |object|.
void DeepFreeze(const v8::Local<v8::Object>& object,
const v8::Local<v8::Context>& context) {
// Don't let the object trace upwards via the prototype.
v8::Maybe<bool> maybe =
object->SetPrototype(context, v8::Null(context->GetIsolate()));
CHECK(maybe.IsJust() && maybe.FromJust());
v8::Local<v8::Array> property_names =
object->GetOwnPropertyNames(context).ToLocalChecked();
for (uint32_t i = 0; i < property_names->Length(); ++i) {
v8::Local<v8::Value> child =
object->Get(context, property_names->Get(context, i).ToLocalChecked())
.ToLocalChecked();
if (child->IsObject())
DeepFreeze(v8::Local<v8::Object>::Cast(child), context);
}
object->SetIntegrityLevel(context, v8::IntegrityLevel::kFrozen);
}
class SchemaRegistryNativeHandler : public ObjectBackedNativeHandler {
public:
SchemaRegistryNativeHandler(V8SchemaRegistry* registry,
std::unique_ptr<ScriptContext> context)
: ObjectBackedNativeHandler(context.get()),
context_(std::move(context)),
registry_(registry) {}
// ObjectBackedNativeHandler:
void AddRoutes() override {
RouteHandlerFunction(
"GetSchema",
base::BindRepeating(&SchemaRegistryNativeHandler::GetSchema,
base::Unretained(this)));
RouteHandlerFunction(
"GetObjectType",
base::BindRepeating(&SchemaRegistryNativeHandler::GetObjectType,
base::Unretained(this)));
}
~SchemaRegistryNativeHandler() override { context_->Invalidate(); }
private:
void GetSchema(const v8::FunctionCallbackInfo<v8::Value>& args) {
args.GetReturnValue().Set(registry_->GetSchema(
args.GetIsolate(), *v8::String::Utf8Value(args.GetIsolate(), args[0])));
}
void GetObjectType(const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK(args.Length() == 1 && args[0]->IsObject());
std::string type;
if (args[0]->IsArray())
type = "array";
else if (args[0]->IsArrayBuffer() || args[0]->IsArrayBufferView())
type = "binary";
else
type = "object";
args.GetReturnValue().Set(
v8_helpers::ToV8StringUnsafe(context()->isolate(), type.c_str()));
}
std::unique_ptr<ScriptContext> context_;
raw_ptr<V8SchemaRegistry, ExperimentalRenderer> registry_;
};
} // namespace
V8SchemaRegistry::V8SchemaRegistry() {
}
V8SchemaRegistry::~V8SchemaRegistry() {
}
std::unique_ptr<NativeHandler> V8SchemaRegistry::AsNativeHandler(
v8::Isolate* isolate) {
std::unique_ptr<ScriptContext> context(
new ScriptContext(GetOrCreateContext(isolate),
nullptr, // no frame
nullptr, // no extension
Feature::UNSPECIFIED_CONTEXT,
nullptr, // no effective extension
Feature::UNSPECIFIED_CONTEXT));
return std::unique_ptr<NativeHandler>(
new SchemaRegistryNativeHandler(this, std::move(context)));
}
v8::Local<v8::Array> V8SchemaRegistry::GetSchemas(
v8::Isolate* isolate,
const std::vector<std::string>& apis) {
v8::EscapableHandleScope handle_scope(isolate);
v8::Local<v8::Context> context = GetOrCreateContext(isolate);
v8::Context::Scope context_scope(context);
v8::MicrotasksScope microtasks_scope(
context, v8::MicrotasksScope::kDoNotRunMicrotasks);
v8::Local<v8::Array> v8_apis(v8::Array::New(isolate, apis.size()));
size_t api_index = 0;
for (auto i = apis.cbegin(); i != apis.cend(); ++i) {
bool set_result =
v8_apis->Set(context, api_index++, GetSchema(isolate, *i)).ToChecked();
// Set() should never return false without throwing an exception (which
// would be caught by the ToChecked() above).
DCHECK(set_result);
}
return handle_scope.Escape(v8_apis);
}
v8::Local<v8::Object> V8SchemaRegistry::GetSchema(v8::Isolate* isolate,
const std::string& api) {
if (schema_cache_ != nullptr) {
v8::Local<v8::Object> cached_schema = schema_cache_->Get(api);
if (!cached_schema.IsEmpty()) {
return cached_schema;
}
}
// Slow path: Need to build schema first.
v8::EscapableHandleScope handle_scope(isolate);
v8::Local<v8::Context> context = GetOrCreateContext(isolate);
v8::Context::Scope context_scope(context);
v8::MicrotasksScope microtasks_scope(
context, v8::MicrotasksScope::kDoNotRunMicrotasks);
base::StringPiece schema_string =
ExtensionAPI::GetSharedInstance()->GetSchemaStringPiece(api);
CHECK(!schema_string.empty());
v8::MaybeLocal<v8::String> v8_maybe_string = v8::String::NewExternalOneByte(
isolate, new StaticV8ExternalOneByteStringResource(schema_string));
v8::Local<v8::String> v8_schema_string;
CHECK(v8_maybe_string.ToLocal(&v8_schema_string));
v8::MaybeLocal<v8::Value> v8_maybe_schema_value =
v8::JSON::Parse(context, v8_schema_string);
v8::Local<v8::Value> v8_schema_value;
CHECK(v8_maybe_schema_value.ToLocal(&v8_schema_value));
CHECK(v8_schema_value->IsObject());
v8::Local<v8::Object> v8_schema_object(
v8::Local<v8::Object>::Cast(v8_schema_value));
DeepFreeze(v8_schema_object, context);
schema_cache_->Set(api, v8_schema_object);
return handle_scope.Escape(v8_schema_object);
}
v8::Local<v8::Context> V8SchemaRegistry::GetOrCreateContext(
v8::Isolate* isolate) {
// It's ok to create local handles in this function, since this is only called
// when we have a HandleScope.
if (!context_holder_) {
context_holder_ = std::make_unique<gin::ContextHolder>(isolate);
context_holder_->SetContext(v8::Context::New(isolate));
schema_cache_ = std::make_unique<SchemaCache>(isolate);
return context_holder_->context();
}
return context_holder_->context();
}
} // namespace extensions
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