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// Copyright (c) 2012 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 "chrome/renderer/extensions/chrome_v8_context.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_split.h"
#include "base/values.h"
#include "chrome/common/extensions/api/extension_api.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/extensions/extension_set.h"
#include "chrome/renderer/extensions/chrome_v8_extension.h"
#include "chrome/renderer/extensions/module_system.h"
#include "chrome/renderer/extensions/user_script_slave.h"
#include "content/public/renderer/render_view.h"
#include "content/public/renderer/v8_value_converter.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
#include "v8/include/v8.h"
using content::V8ValueConverter;
namespace extensions {
namespace {
const char kChromeHidden[] = "chromeHidden";
const char kValidateCallbacks[] = "validateCallbacks";
const char kValidateAPI[] = "validateAPI";
} // namespace
ChromeV8Context::ChromeV8Context(v8::Handle<v8::Context> v8_context,
WebKit::WebFrame* web_frame,
const Extension* extension,
Feature::Context context_type)
: v8_context_(v8_context),
web_frame_(web_frame),
extension_(extension),
context_type_(context_type) {
VLOG(1) << "Created context:\n"
<< " extension id: " << GetExtensionID() << "\n"
<< " frame: " << web_frame_ << "\n"
<< " context type: " << GetContextTypeDescription();
}
ChromeV8Context::~ChromeV8Context() {
VLOG(1) << "Destroyed context for extension\n"
<< " extension id: " << GetExtensionID();
Invalidate();
}
void ChromeV8Context::Invalidate() {
if (v8_context_.get().IsEmpty())
return;
if (module_system_)
module_system_->Invalidate();
web_frame_ = NULL;
v8_context_.reset();
}
std::string ChromeV8Context::GetExtensionID() {
return extension_ ? extension_->id() : std::string();
}
// static
v8::Handle<v8::Value> ChromeV8Context::GetOrCreateChromeHidden(
v8::Handle<v8::Context> context) {
v8::Local<v8::Object> global = context->Global();
v8::Local<v8::Value> hidden = global->GetHiddenValue(
v8::String::New(kChromeHidden));
if (hidden.IsEmpty() || hidden->IsUndefined()) {
hidden = v8::Object::New();
global->SetHiddenValue(v8::String::New(kChromeHidden), hidden);
if (DCHECK_IS_ON()) {
// Tell bindings.js to validate callbacks and events against their schema
// definitions.
v8::Local<v8::Object>::Cast(hidden)->Set(
v8::String::New(kValidateCallbacks), v8::True());
// Tell bindings.js to validate API for ambiguity.
v8::Local<v8::Object>::Cast(hidden)->Set(
v8::String::New(kValidateAPI), v8::True());
}
}
DCHECK(hidden->IsObject());
return v8::Local<v8::Object>::Cast(hidden);
}
v8::Handle<v8::Value> ChromeV8Context::GetChromeHidden() const {
v8::Local<v8::Object> global = v8_context_->Global();
return global->GetHiddenValue(v8::String::New(kChromeHidden));
}
content::RenderView* ChromeV8Context::GetRenderView() const {
if (web_frame_ && web_frame_->view())
return content::RenderView::FromWebView(web_frame_->view());
else
return NULL;
}
bool ChromeV8Context::CallChromeHiddenMethod(
const std::string& function_name,
int argc,
v8::Handle<v8::Value>* argv,
v8::Handle<v8::Value>* result) const {
// ChromeV8ContextSet calls Invalidate() and then schedules a task to delete
// this object. This check prevents a race from attempting to execute script
// on a NULL web_frame_.
if (!web_frame_)
return false;
v8::Context::Scope context_scope(v8_context_.get());
// Look up the function name, which may be a sub-property like
// "Port.dispatchOnMessage" in the hidden global variable.
v8::Local<v8::Value> value = v8::Local<v8::Value>::New(GetChromeHidden());
if (value.IsEmpty())
return false;
std::vector<std::string> components;
base::SplitStringDontTrim(function_name, '.', &components);
for (size_t i = 0; i < components.size(); ++i) {
if (!value.IsEmpty() && value->IsObject()) {
value = v8::Local<v8::Object>::Cast(value)->Get(
v8::String::New(components[i].c_str()));
}
}
if (value.IsEmpty() || !value->IsFunction()) {
VLOG(1) << "Could not execute chrome hidden method: " << function_name;
return false;
}
TRACE_EVENT1("v8", "v8.callChromeHiddenMethod",
"function_name", function_name);
v8::Local<v8::Function> function = v8::Local<v8::Function>::Cast(value);
v8::Handle<v8::Value> result_temp =
web_frame_->callFunctionEvenIfScriptDisabled(function,
v8::Object::New(),
argc,
argv);
if (result)
*result = result_temp;
return true;
}
Feature::Availability ChromeV8Context::GetAvailability(
const std::string& api_name) {
return ExtensionAPI::GetSharedInstance()->IsAvailable(
api_name,
extension_,
context_type_,
UserScriptSlave::GetDataSourceURLForFrame(web_frame_));
}
void ChromeV8Context::DispatchOnLoadEvent(bool is_incognito_process,
int manifest_version) {
v8::HandleScope handle_scope;
v8::Handle<v8::Value> argv[] = {
v8::String::New(GetExtensionID().c_str()),
v8::String::New(GetContextTypeDescription().c_str()),
v8::Boolean::New(is_incognito_process),
v8::Integer::New(manifest_version),
};
CallChromeHiddenMethod("dispatchOnLoad", arraysize(argv), argv, NULL);
}
void ChromeV8Context::DispatchOnUnloadEvent() {
v8::HandleScope handle_scope;
CallChromeHiddenMethod("dispatchOnUnload", 0, NULL, NULL);
}
std::string ChromeV8Context::GetContextTypeDescription() {
switch (context_type_) {
case Feature::UNSPECIFIED_CONTEXT: return "UNSPECIFIED";
case Feature::BLESSED_EXTENSION_CONTEXT: return "BLESSED_EXTENSION";
case Feature::UNBLESSED_EXTENSION_CONTEXT: return "UNBLESSED_EXTENSION";
case Feature::CONTENT_SCRIPT_CONTEXT: return "CONTENT_SCRIPT";
case Feature::WEB_PAGE_CONTEXT: return "WEB_PAGE";
}
NOTREACHED();
return std::string();
}
ChromeV8Context* ChromeV8Context::GetContext() {
return this;
}
void ChromeV8Context::OnResponseReceived(const std::string& name,
int request_id,
bool success,
const base::ListValue& response,
const std::string& error) {
v8::HandleScope handle_scope;
scoped_ptr<V8ValueConverter> converter(V8ValueConverter::create());
v8::Handle<v8::Value> argv[] = {
v8::Integer::New(request_id),
v8::String::New(name.c_str()),
v8::Boolean::New(success),
converter->ToV8Value(&response, v8_context_.get()),
v8::String::New(error.c_str())
};
v8::Handle<v8::Value> retval;
CHECK(CallChromeHiddenMethod("handleResponse", arraysize(argv), argv,
&retval));
// In debug, the js will validate the callback parameters and return a
// string if a validation error has occured.
if (DCHECK_IS_ON()) {
if (!retval.IsEmpty() && !retval->IsUndefined()) {
std::string error = *v8::String::AsciiValue(retval);
DCHECK(false) << error;
}
}
}
} // namespace extensions
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