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// Copyright (c) 2009 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/external_extension.h"
#include "base/command_line.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/render_messages_params.h"
#include "chrome/renderer/render_view.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "v8/include/v8.h"
using WebKit::WebFrame;
using WebKit::WebView;
namespace extensions_v8 {
static const char* const kSearchProviderApiV1 =
"var external;"
"if (!external)"
" external = {};"
"external.AddSearchProvider = function(name) {"
" native function NativeAddSearchProvider();"
" NativeAddSearchProvider(name);"
"};";
static const char* const kSearchProviderApiV2 =
"var external;"
"if (!external)"
" external = {};"
"external.AddSearchProvider = function(name, default_provider) {"
" native function NativeAddSearchProvider();"
" NativeAddSearchProvider(name, default_provider);"
"};"
"external.IsSearchProviderInstalled = function(name) {"
" native function NativeIsSearchProviderInstalled();"
" return NativeIsSearchProviderInstalled(name);"
"};";
#undef SEARCH_PROVIDER_API_V1
const char* const kExternalExtensionName = "v8/External";
// Should the new api's "IsSearchProviderInstalled and InstallSearchProvider
// with an extra parameter to indicate if the provider should be the default"
// be available?
static bool EnableSearchProviderV2() {
#if defined(OS_WIN)
return true;
#else
return CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableSearchProviderApiV2);
#endif
}
class ExternalExtensionWrapper : public v8::Extension {
public:
ExternalExtensionWrapper();
// Allows v8's javascript code to call the native functions defined
// in this class for window.external.
virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
v8::Handle<v8::String> name);
// Helper function to find the RenderView. May return NULL.
static RenderView* GetRenderView();
// Implementation of window.external.AddSearchProvider.
static v8::Handle<v8::Value> AddSearchProvider(const v8::Arguments& args);
// Implementation of window.external.IsSearchProviderInstalled.
static v8::Handle<v8::Value> IsSearchProviderInstalled(
const v8::Arguments& args);
private:
DISALLOW_COPY_AND_ASSIGN(ExternalExtensionWrapper);
};
ExternalExtensionWrapper::ExternalExtensionWrapper()
: v8::Extension(
kExternalExtensionName,
!EnableSearchProviderV2() ?
kSearchProviderApiV1 : kSearchProviderApiV2) {
}
v8::Handle<v8::FunctionTemplate> ExternalExtensionWrapper::GetNativeFunction(
v8::Handle<v8::String> name) {
if (name->Equals(v8::String::New("NativeAddSearchProvider")))
return v8::FunctionTemplate::New(AddSearchProvider);
if (name->Equals(v8::String::New("NativeIsSearchProviderInstalled")))
return v8::FunctionTemplate::New(IsSearchProviderInstalled);
return v8::Handle<v8::FunctionTemplate>();
}
// static
RenderView* ExternalExtensionWrapper::GetRenderView() {
WebFrame* webframe = WebFrame::frameForEnteredContext();
DCHECK(webframe) << "There should be an active frame since we just got "
"a native function called.";
if (!webframe) return NULL;
WebView* webview = webframe->view();
if (!webview) return NULL; // can happen during closing
return RenderView::FromWebView(webview);
}
// static
v8::Handle<v8::Value> ExternalExtensionWrapper::AddSearchProvider(
const v8::Arguments& args) {
if (!args.Length()) return v8::Undefined();
std::string name = std::string(*v8::String::Utf8Value(args[0]));
if (!name.length()) return v8::Undefined();
ViewHostMsg_PageHasOSDD_Type provider_type =
((args.Length() < 2) || !args[1]->BooleanValue()) ?
ViewHostMsg_PageHasOSDD_Type::Explicit() :
ViewHostMsg_PageHasOSDD_Type::ExplicitDefault();
RenderView* render_view = GetRenderView();
if (!render_view) return v8::Undefined();
render_view->AddSearchProvider(name, provider_type);
return v8::Undefined();
}
// static
v8::Handle<v8::Value> ExternalExtensionWrapper::IsSearchProviderInstalled(
const v8::Arguments& args) {
if (!args.Length()) return v8::Undefined();
std::string name = std::string(*v8::String::Utf8Value(args[0]));
if (!name.length()) return v8::Undefined();
RenderView* render_view = GetRenderView();
if (!render_view) return v8::Undefined();
WebFrame* webframe = WebFrame::frameForEnteredContext();
if (!webframe) return v8::Undefined();
ViewHostMsg_GetSearchProviderInstallState_Params install
= render_view->GetSearchProviderInstallState(webframe, name);
if (install.state ==
ViewHostMsg_GetSearchProviderInstallState_Params::DENIED) {
// FIXME: throw access denied exception.
return v8::ThrowException(v8::Exception::Error(v8::String::Empty()));
}
return v8::Integer::New(install.state);
}
v8::Extension* ExternalExtension::Get() {
return new ExternalExtensionWrapper();
}
} // namespace extensions_v8
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